Carrier Heating System 48MPD User Manual
48MPD,MPE62L-10R  
50MP62L-10R  
Single Package Electric Cooling Units  
and Gas Heating/Electric Cooling Units  
With Product Integrated Controls  
Installation, Start-Up and Service  
Instructions  
CONTENTS  
Page  
Page  
Gas Pressure Check . . . . . . . . . . . . . . . . . . . . . . . . 38  
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . .  
2
2
Check Supply Fan Rotation . . . . . . . . . . . . . . . . . 38  
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38-42  
Initial Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38  
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39  
Operating Sequences . . . . . . . . . . . . . . . . . . . . . . 39  
• SUPPLY FAN  
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28  
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Unit Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Roof Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Slab Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Field-Fabricated Ductwork . . . . . . . . . . . . . . . . . .  
Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Condensate Drains . . . . . . . . . . . . . . . . . . . . . . . . .  
Condensate Coil Shipping Covers . . . . . . . . . .  
Install Outdoor Hoods . . . . . . . . . . . . . . . . . . . . . .  
3
3
3
3
3
3
3
3
3
• ECONOMIZER  
• COOLING (All Units)  
• OCCUPIED COOLING  
• UNOCCUPIED COOLING  
• OVERRIDES  
• ADAPTIVE OPTIMAL START  
Make Electrical Connections . . . . . . . . . . . . . . . . 14  
• POWER SUPPLY  
• ADAPTIVE OPTIMAL STOP  
(CV Applications Only)  
Field Electrical Connections . . . . . . . . . . . . . . . . 14  
• POWER WIRING  
• GAS HEATING, OPERATION  
(48MP Units Only)  
Control Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
• SENSORS  
Control Loop Checkout . . . . . . . . . . . . . . . . . . . . . 41  
IAQ Control Loop Adjustment . . . . . . . . . . . . . . . 42  
Lead/Lag Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . 42  
Final Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42  
• HUMIDITY CONTROL AND HOT WATER  
AND STEAM VALVES  
• SPACE TEMPERATURE SENSOR (T55)  
• SPACE TEMPERATURE SENSOR (T56)  
(CV Applications Only)  
CONTROL SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . 42-45  
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42  
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42  
• PROCESSOR MODULE NO. 1  
• SPACE TEMPERATURE AVERAGING  
• HEAT INTERLOCK RELAY (VAV Units Only  
— Not Necessary For DAV Applications)  
• OPTION AND ACCESSORY CONTROL WIRING  
Carrier Comfort Network Interface . . . . . . . . . . 23  
Air Pressure Tubing . . . . . . . . . . . . . . . . . . . . . . . . 24  
Gas Piping (48 Series Units Only) . . . . . . . . . . . . 26  
Installing Flue/Inlet Hoods  
(48MP Units Only) . . . . . . . . . . . . . . . . . . . . . . . . . 26  
Fan Isolator Adjustment . . . . . . . . . . . . . . . . . . . . 27  
Check Compressor Mounting . . . . . . . . . . . . . . . 27  
Install Accessories . . . . . . . . . . . . . . . . . . . . . . . . . 27  
• PROCESSOR MODULE NO. 2  
• HIGH-VOLTAGE RELAY MODULES (DSIO)  
• KEYPAD AND DISPLAY MODULE (HSIO)  
Default Set Points/Changing Set Points . . . . . 43  
Motor Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . 43  
Variable Frequency Drive (VFD) . . . . . . . . . . . . . 43  
• DISPLAY AND KEYPAD  
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45-55  
Service Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45  
• UNIT CONTROL BOX  
• COMPRESSORS  
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28-38  
System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  
Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  
Evaporator-Fan Belts, Pulleys,  
and Sheaves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  
Controls Configuration and Quick Test . . . . . . 35  
• SUPPLY FAN STATUS SWITCH (FS)  
• CHECK FILTER SWITCH (CFS)  
• LIQUID SERVICE VALVES, SOLENOID VALVES,  
FILTER DRIERS, AND SIGHT GLASSES  
• EVAPORATOR-FAN MOTORS, PULLEYS, AND  
BELTS  
• POWER EXHAUST MOTORS, PULLEYS, AND  
BELTS  
• GAS HEAT SECTION  
• UNIT CONTROL BOX  
• ECONOMIZER DAMPER MOTORS  
• RETURN-AIR FILTERS  
• ENTHALPY CONTROL SET POINT  
• KEYPAD AND DISPLAY MODULE (HSIO)  
CONFIGURATION  
• CONDENSER FANS AND FAN MOTORS  
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46  
• SET UNIT TYPE  
• ENTER JOB SET POINT VALUES  
• CONFIGURE UNIT CONTROLS AND  
FUNCTIONS  
• QUICK TEST FUNCTION  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book 1 PC 111 Catalog No. 534-893 Printed in U.S.A. Form 48/50MP-1SI Pg 1 12-98 Replaces: 50MP-1SI  
Tab 1a 1b  
1
Download from Www.Somanuals.com. All Manuals Search And Download.  
Secure all ducts to the building structure, using flexible  
duct connectors between roof curb and ducts as required. Ducts  
passing through an unconditioned space must be insulated  
and covered with a vapor barrier. Outlet grilles must not lie  
directly below unit discharge. The return duct must have a  
90-degree elbow before opening into the building space if  
unit is equipped with power exhaust.  
INSTALLATION  
Jobsite Survey — Complete the following checks be-  
fore installation.  
1. Consult local building codes and the NEC (National  
Electrical Code) (ANSI/NFPA [National Fire Protection  
Association] 70) for special installation requirements.  
Design supply duct strong enough to handle expected static  
pressures.  
2. Determine unit location (from project plans) or select unit  
location.  
3. Check for possible overhead obstructions which may in-  
terfere with unit lifting or rigging.  
For vertical supply and return units, tools or parts could  
drop into ductwork and cause an injury. Install 90 de-  
gree turns in the supply and return ductwork between  
the unit and the conditioned space. If a 90 degree elbow  
cannot be installed, then grilles of sufficient strength and  
density should be installed to prevent objects from fall-  
ing into the conditioned space.  
Do not lift unit with forklift truck. Move unit with  
overhead rigging only.  
Unit Placement — Inspect unit for transportation dam-  
age. File claim with transportation agency.  
Provide clearance around and above unit for airflow, safety,  
and service access. Do not restrict top (area above con-  
denser fans) in any way. Allow at least 6 ft on all sides for  
rated performance, code compliance, and service.  
Check unit dimensional drawings for unit arrangement and  
minimum performance and service clearances.  
Do not install unit in an indoor location. Do not locate air  
inlets near exhaust vents or other sources of contaminated  
air.  
Rigging — Do not drop unit; keep upright. Use spreader  
bars over unit to prevent sling or cable damage. Leave con-  
denser coil shipping protection in place while rigging to  
prevent coil damage. All lifting lugs MUST be used when  
lifting unit.  
Level by using unit frame as a reference. See Fig. 7 for  
information. Unit and accessory weights are shown in  
Tables 1-4. Weight distribution and center of gravity can be  
found in Fig. 8.  
On units equipped with power exhaust option, high  
velocity air is exhausted out the hood. Unit should be  
positioned with at least 10 ft clearance between the exhaust  
hood and any obstruction. Although unit is weatherproof, guard  
against water from higher level runoff and overhangs.  
Condensate Drains — The condensate drain connec-  
1
tion is a 1 ⁄2-in. NPT pipe connection located on the right  
hand side of the unit. See Fig. 9.  
NOTE: Use a trap of at least 7-in. deep.  
Level by using unit frame as a reference. Physical data is  
shown in Tables 1-4.  
Condenser Coil Shipping Covers — Remove and  
discard.  
Roof Mount — Check building codes for weight distri-  
bution requirements. Unit weight is shown in Table 1. Unit  
may be mounted on class A, B, or C roofing material.  
Install Outdoor Hoods  
1. Outdoor-air hoods are shipped bolted to the unit in a ship-  
ping position. To open hoods, remove the 3 holddown  
bars holding the air hood in shipping position. See  
Fig. 10.  
2. Lift up the highest hood top and swing out hood sides to  
form the outside frame of the air hood. Fasten hood top  
to hood sides at middle and top holes only, using two screws  
on each side. See Fig. 11.  
ROOF CURB — Assemble and install as described in in-  
structions shipped with the accessory. Accessory roof curb  
and information required to field fabricate a roof curb is shown  
in Fig. 1 and 2. Install insulation, cant strips, roofing, and  
counter flashing as required. For unit condensate drain to func-  
tion properly, curb must be level or within tolerances shown  
in Fig. 1 and 2.  
3. Remove the bottom hood block-off plate and set aside.  
STEEL BEAMS — If roof curb is not used, support unit  
with steel beams along its entire length and then support steel  
as required. As a minimum, unit must be supported across  
its width at each lifting lug location.  
4. Swing up second hood (from the top of unit) into place  
and fasten to hood sides with screws provided using up-  
per hole only.  
5. Swing up third hood (from the top of unit) into place and  
fasten to hood sides with screws provided using upper  
hole only.  
6. Swing up fourth hood (bottom hood) into place. Before  
fastening hood to hood sides, swing down bottom filter  
rack. Fasten hood to hood sides with screws provided us-  
ing upper hole only.  
Slab Mount — Provide a level concrete slab that ex-  
tends beyond unit cabinet at least 6 inches. Make a slab 8 in.  
thick with 4 in. above grade. Use gravel apron in front of  
condenser coil air inlet to prevent grass and foliage from ob-  
structing airflow. Ensure that slab is of sufficient height to  
allow for 7-in. condensate trap.  
7. Attach block off plate removed from Step 3.  
Field-Fabricated Ductwork — Units are designed for  
vertical supply/return only. Field-fabricated ductwork should  
be attached to the roof curb. Supply and return duct dimen-  
sions are shown in Fig. 1-6.  
8. Clip wire tie holding filter track. Swing filter track into  
position and fasten to hood sides using screws provided.  
Repeat until all 4 filter racks have been installed.  
To attach ductwork to roof curb, insert duct approxi-  
mately 10 to 11 in. up into roof curb. Connect ductwork to  
14-gage roof curb material with sheet metal screws driven  
from inside of the duct.  
9. Apply a bead of RTV or similar sealant to corner of each  
hood at pivot point to prevent water leaks.  
Copy continues on page 14.  
3
Download from Www.Somanuals.com. All Manuals Search And Download.  
Table 1 — Physical Data  
BASE UNIT 48/50MP  
NOMINAL CAPACITY (tons)  
62L  
70M  
82N  
80  
90  
105  
OPERATING WEIGHT (lb)  
Base Unit (48MP/50MP)  
Copper Condenser Coils  
Exhaust Fan  
16,810/16,550  
675  
18,060/17,800  
725  
22,660/22,400  
725  
1,675  
1,775  
2,375  
COMPRESSORS  
Semi-Hermetic  
Number of Refrigerant Circuits  
Circuit (No. of Cylinders)  
Model 06E  
2
2
2
A (6)  
B (6)  
−299  
19  
A1 (6), A2 (4)  
−275, −250  
19, 14  
B (6)  
−299  
19  
A1 (6), A2 (4)  
B1 (6), B2 (6)  
−265, −265  
19,19  
−299  
19  
−265, −250  
19, 14  
Oil Charge (pints)  
Capacity Steps (%)  
17,33,50,67,83,100  
11,22,33,41,56,67,78,89,100  
18,26,35,44,53,56,65,74,82,91,100  
REFRIGERANT  
Operating Charge (lb), Sys 1/Sys 2 (Standard Coil)  
Operating Charge (lb), Sys 1/Sys 2 (Alternate Coil)  
R-22  
85/82  
94/85  
78/78  
83/83  
85/82  
92/88  
CONDENSER COILS  
Quantity  
Grooved Tube (3⁄8-in. OD)  
4
4
4
Rows...Fins/in.  
3...17  
116.7  
3...17  
128.3  
3...17  
128.3  
Total Face Area (sq ft)  
EVAPORATOR COILS  
Quantity  
Smooth Tube (5⁄8-in. OD)  
2
2
2
Rows...Fins/in.  
Standard  
3...14  
4...14  
62.6  
3...14  
4...14  
70.0  
3...14  
4...14  
82.0  
Alternate  
Total Face Area (sq ft)  
Refrigerant Feed  
Device...No. per Circuit  
TXV...2  
TXV...2  
TXV...2  
EVAPORATOR FANS  
Forward Curved Fan  
Motor Hp  
30  
286T  
40  
324T  
40  
324T  
50  
326T  
40  
324T  
50  
326T  
Motor Frame Size  
Efficiency at Full Load (%)  
Standard Efficiency  
High Efficiency  
Fan Pulley Pitch Diameter (in.)  
Motor Pulley Pitch Diameter (in.)  
Fan Rpm  
92.4  
93.6  
93.0  
94.5  
93.0  
94.5  
93.0  
94.5  
93.0  
94.5  
93.0  
94.5  
18.4  
16.0  
15.4  
15.4  
20.0  
18.4  
6.2  
608  
6.4  
705  
5.6  
658  
6.4  
747  
5.8  
526  
6.0  
590  
Belts Quantity...Model No.  
Center Distance Range (in.)  
Maximum Rpm  
3...BX128  
42.1-46.1  
835  
4...BX124  
43.1-48.2  
835  
5...BX124  
43.1-48.2  
835  
5...BX124  
43.1-48.2  
835  
5...BX115  
35.4-40.2  
715  
6...BX112  
35.4-40.2  
715  
Air Foil Fan  
Motor Hp  
Motor Frame Size  
30  
286T  
40  
324T  
40  
324T  
50  
326T  
40  
324T  
50  
326T  
Efficiency at Full Load (%)  
Standard Efficiency  
High Efficiency  
Fan Pulley Pitch Diameter (in.)  
Motor Pulley Pitch Diameter (in.)  
Fan Rpm  
92.4  
93.6  
93.0  
94.5  
92.4  
93.6  
93.0  
94.5  
92.4  
93.6  
93.0  
94.5  
11.0  
12.4  
12.4  
9.1  
12.5  
12.5  
7.4  
1192  
9.4  
1337  
9.4  
1337  
7.5  
1442  
6.9  
966  
7.5  
1050  
Belts Quantity...Model No.  
Center Distance Range (in.)  
Maximum Rpm  
3...B111  
39.7-43.7  
1595  
3...B120  
40.4-45.2  
1595  
3...B120  
40.4-45.2  
1595  
3...5VX1120  
40.4-45.2  
1595  
3...5VX1060  
35.4-39.4  
1298  
3...5VX1060  
35.4-39.4  
1298  
Air Foil Fan (cont)  
Motor Hp  
Motor Frame Size  
50  
326T  
60  
364T  
60  
364T  
Efficiency at Full Load (%)  
Standard Efficiency  
High Efficiency  
Fan Pulley Pitch Diameter (in.)  
Motor Pulley Pitch Diameter (in.)  
Fan Rpm  
93.0  
94.5  
9.1  
94.5  
95.4  
8.1  
94.5  
95.4  
11.0  
7.1  
7.5  
7.1  
1442  
1534  
1119  
Belts Quantity...Model No.  
Center Distance Range (in.)  
Maximum Rpm  
3...5VX1120  
40.4-45.2  
1595  
4...5VX1080  
39.4-44.9  
1595  
4...5VX1030  
34.4-39.1  
1298  
CONDENSER FANS  
Quantity...Diameter (in.)  
Nominal Cfm  
6...30  
52,000  
1...1140  
6...30  
52,000  
1...1140  
6...30  
52,000  
1...1140  
Motor Hp...Rpm  
SUPPLY FAN  
Forward Curve  
Airfoil  
32,000  
33.0  
1595  
2.44  
Forward Curve  
Airfoil  
36,000  
33.0  
1595  
2.44  
Forward Curve  
Airfoil  
42,000  
40.25  
1298  
Nominal Cfm  
32,000  
30.0  
36,000  
30.0  
42,000  
36.0  
Size (in.)  
Maximum Allowable Rpm  
Shaft Diameter at Pulley (in.)  
835  
2.69  
835  
2.69  
715  
2.69  
2.44  
FURNACE SECTION (48MP Units Only)  
Rollout Switch Cutout Temp (F)  
Number of Burners  
190  
7
0.136...29  
342,000  
3.3  
190  
7
0.136...29  
342,000  
3.3  
Burner Orifice Diameter (in. ...drill size)  
Gas Input (Btuh)  
Manifold Pressure (in. wg) — Natural Gas  
Gas Valve Input Pressure Range  
in. wg  
5.5-13.5  
0.235-0.487  
5.5-13.5  
0.235-0.487  
psig  
LOW HEAT (48MPD)/HIGH HEAT (48MPE)  
Number of Sections  
2/3  
515,000/770,000  
685,000/1,025,000  
81/81  
10-40/20-50  
12,850/15,400  
2
2/3  
Gas Input (Btuh) Stage 1  
Stage 2  
515,000/770,000  
685,000/1,025,000  
81/81  
Efficiency (Steady State %)  
Temperature Rise Range (F)  
Minimum Heating Airflow (cfm)  
Field Gas Connection Size (in.)  
5-35/10-40  
14,700/19,250  
2
FILTERS  
Medium Efficiency (30%)  
Pleated (Standard)  
Quantity...Size (in.)  
15...24 x 24 x 2,  
5...24 x 12 x 2  
15...24 x 24 x 2,  
5...24 x 12 x 2  
20...24 x 24 x 2,  
5...24 x 12 x 2  
High Efficiency (90%) Cartridge Filters  
with Prefilters (Optional)  
Quantity...Size (in.)  
Outdoor Air Inlet Screens  
Quantity...Size (in.)  
15...24 x 24 x 4,  
5...24 x 12 x 4  
15...24 x 24 x 4,  
5...24 x 12 x 4  
Cleanable Aluminum  
16...20 x 25 x 1  
20...24 x 24 x 4,  
5...24 x 12 x 4  
16...20 x 25 x 1  
24...20 x 25 x 1  
LEGEND  
TXV  
—
Thermostatic Expansion Valve  
4
Download from Www.Somanuals.com. All Manuals Search And Download.  
Table1 — Physical Data (cont)  
BASE UNIT 48/50MP  
NOMINAL CAPACITY (tons)  
90P  
10R  
115  
120  
OPERATING WEIGHT (lb)  
Base Unit (48MP/50MP)  
Copper Condenser Coils  
Exhaust Fan  
24,660/24,750  
950  
25,110/25,100  
950  
2400  
2400  
COMPRESSORS  
Semi-Hermetic  
Number of Refrigerant Circuits  
Circuit (No. of Cylinders)  
Model 06E  
2
2
A1 (6), A2 (6)  
−265, −275  
19, 19  
B1 (6), B2 (6)  
A1 (6), A2 (6)  
−265, −299  
19, 19  
B1 (6), B2 (6)  
−265, −275  
19, 19  
−265, −275  
19, 19  
Oil Charge (pints)  
Capacity Steps (%)  
15,23,30,38,45,58,65,73,85,92,100  
14,21,28,35,42,61,68,75,86,93,100  
REFRIGERANT  
Operating Charge (lb), Sys 1/Sys 2 (Standard Coil)  
Operating Charge (lb), Sys 1/Sys 2 (Alternate Coil)  
R-22  
85/85  
93/93  
86/87  
93/96  
CONDENSER COILS  
Quantity  
Grooved Tube (3⁄8-in. OD)  
Smooth Tube (5⁄8-in. OD)  
4
4
Rows...Fins/in.  
3...17  
168.0  
3...17  
168.0  
Total Face Area (sq ft)  
EVAPORATOR COILS  
Quantity  
Rows...Fins/in.  
Standard  
Alternate  
Total Face Area (sq ft)  
Refrigerant Feed  
Device...No. per Circuit  
2
2
3...14  
4...14  
90.3  
3...14  
4...14  
101.4  
TXV...2  
TXV...2  
EVAPORATOR FANS  
Forward Curved Fan  
Motor Hp  
50  
326T  
60  
364T  
60  
364T  
Motor Frame Size  
Efficiency at Full Load (%)  
Standard Efficiency  
High Efficiency  
Fan Pulley Pitch Diameter (in.)  
Motor Pulley Pitch Diameter (in.)  
Fan Rpm  
93.0  
94.5  
94.5  
95.4  
94.5  
95.4  
18.8  
18.8  
21.3  
5.9  
555  
6.7  
630  
6.7  
556  
Belts Quantity...Model No.  
Center Distance Range (in.)  
Maximum Rpm  
4...5VX1120  
35.4/40.2  
715  
4...5VX1120  
35.4/40.2  
715  
4...5VX1150  
34.2/40.2  
715  
Air Foil Fan  
Motor Hp  
Motor Frame Size  
50  
326T  
60  
364T  
50  
326T  
60  
364T  
Efficiency at Full Load (%)  
Standard Efficiency  
High Efficiency  
Fan Pulley Pitch Diameter (in.)  
Motor Pulley Pitch Diameter (in.)  
Fan Rpm  
93.0  
94.5  
94.5  
95.4  
93.0  
94.5  
94.5  
95.4  
12.5  
13.7  
13.7  
13.7  
7.5  
1050  
8.7  
1111  
8.1  
1035  
8.7  
1111  
Belts Quantity...Model No.  
Center Distance Range (in.)  
Maximum Rpm  
3...5VX1030  
35.4/39.4  
1298  
3...5VX1060  
34.4/39.1  
1298  
3...5VX1060  
35.4/39.4  
1298  
3...5VX1060  
34.4/39.1  
1298  
Air Foil Fan (cont)  
Motor Hp  
Motor Frame Size  
75  
365T  
75  
365T  
Efficiency at Full Load (%)  
Standard Efficiency  
High Efficiency  
Fan Pulley Pitch Diameter (in.)  
Motor Pulley Pitch Diameter (in.)  
Fan Rpm  
95.4  
—
95.4  
—
16.1  
16.1  
11.1  
1207  
11.1  
1207  
Belts Quantity...Model No.  
Center Distance Range (in.)  
Maximum Rpm  
3...5VX1120  
34.4/39.1  
1298  
3...5VX1120  
34.4/39.1  
1298  
CONDENSER FANS  
Quantity...Diameter (in.)  
Nominal Cfm  
8...30  
69,500  
1...1140  
8...30  
69,500  
1...1140  
Motor Hp...Rpm  
SUPPLY FAN  
Forward Curve  
46,000  
36.0  
Airfoil  
46,000  
40.25  
1298  
Forward Curve  
52,000  
36.0  
Airfoil  
52,000  
40.25  
1298  
Nominal Cfm  
Size (in.)  
Maximum Allowable Rpm  
Shaft Diameter at Pulley (in.)  
715  
715  
2.69  
2.44  
2.69  
2.44  
FURNACE SECTION (48MP Units Only)  
Rollout Switch Cutout Temp (F)  
Number of Burners  
190  
7
0.136...29  
342,000  
3.3  
Burner Orifice Diameter (in. ...drill size)  
Gas Input (Btuh)  
Manifold Pressure (in. wg) — Natural Gas  
Gas Valve Input Pressure Range  
in. wg  
5.5-13.5  
0.235-0.487  
psig  
LOW HEAT (48MPD)/HIGH HEAT (48MPE)  
Number of Sections  
2/3  
Gas Input (Btuh) Stage 1  
Stage 2  
515,000/770,000  
685,000/1,025,000  
81/81  
Efficiency (Steady State %)  
Temperature Rise Range (F)  
Minimum Heating Airflow (cfm)  
Field Gas Connection Size (in.)  
5-35/10-40  
14,700/19,250  
2
FILTERS  
Medium Efficiency (30%)  
Pleated (Standard) Quantity...Size (in.)  
High Efficiency (90%)  
20...24 x 24 x 2,  
5...24 x 12 x 2  
20...24 x 24 x 2,  
5...24 x 12 x 2  
Cartridge Filters with Prefilters (Optional)  
Quantity...Size (in.)  
Outdoor Air Inlet Screens  
Quantity...Size (in.)  
20...24 x 24 x 4,  
5...24 x 12 x 4  
20...24 x 24 x 4,  
5...24 x 12 x 4  
Cleanable Aluminum  
24...20 x 25 x 1  
24...20 x 25 x 1  
LEGEND  
TXV  
—
Thermostatic Expansion Valve  
5
Download from Www.Somanuals.com. All Manuals Search And Download.  
Table 2 — Optional Power Exhaust Specifications  
UNIT 48/50MP  
62L  
70M  
82N  
Type  
100% Mod  
30  
100% Non Mod  
100% Mod  
40  
100% Non Mod  
100% Mod  
40  
100% Non Mod  
Motor Hp  
30  
40  
40  
Motor Frame Size  
286T  
286T  
324T  
324T  
324T  
324T  
Efficiency at Full Load (%)  
Standard Efficiency  
92.4  
93.6  
92.4  
93.6  
93.0  
94.5  
93.0  
94.5  
93.0  
94.5  
93.0  
94.5  
High Efficiency  
Fan Pulley Pitch Diameter (in.)  
Motor Pulley Pitch Diameter (in.)  
Fan Rpm  
18.4  
18.4  
18.4  
18.4  
25.0  
20.0  
5.6  
6.0  
6.2  
6.6  
6.8  
5.8  
552  
590  
608  
646  
491  
526  
Belts Quantity...Model No.  
Center Distance Range (in.)  
Maximum Allowable Rpm  
4...BX80  
19.9-23.3  
650  
4...BX81  
19.9-23.3  
650  
5...BX80  
18.6-22.8  
835  
5...BX80  
18.6-22.8  
835  
5...B90  
21.8-25.9  
560  
5...BX90  
21.8-25.9  
560  
Type  
50% Non Mod  
50% Non Mod  
50% Non Mod  
Motor Hp  
7.5  
7.5  
7.5  
Motor Frame Size  
213T  
213T  
213T  
Efficiency at Full Load (%)  
Standard Efficiency  
88.5  
91.7  
88.5  
91.7  
88.5  
91.7  
High Efficiency  
Fan Pulley Pitch Diameter (in.)  
Motor Pulley Pitch Diameter (in.)  
Fan Rpm  
15.4  
16.0  
18.4  
3.6  
3.6  
3.6  
412  
397  
346  
Belts Quantity...Model No.  
Center Distance Range (in.)  
Maximum Allowable Rpm  
2...BX75  
21.3-24.1  
690  
2...BX77  
21.7-24.2  
650  
2...BX90  
24.9-27.4  
600  
Table 2 — Optional Power Exhaust Specifications (cont)  
UNIT 48/50MP  
90P  
10R  
Type  
100% Mod  
50  
100% Non Mod  
100% Mod  
60  
100% Non Mod  
Motor Hp  
50  
60  
Motor Frame Size  
326T  
326T  
364T  
364T  
Efficiency at Full Load (%)  
Standard Efficiency  
93.0  
94.5  
93.0  
94.5  
94.5  
95.4  
94.5  
95.4  
High Efficiency  
Fan Pulley Pitch Diameter (in.)  
Motor Pulley Pitch Diameter (in.)  
Fan Rpm  
28.1  
28.1  
28.1  
28.1  
8.1  
8.1  
9.1  
9.1  
508  
508  
558  
558  
Belts Quantity...Model No.  
Center Distance Range (in.)  
Maximum Allowable Rpm  
3...5VX1060  
21.8/25.9  
560  
3...5VX1060  
21.8/25.9  
560  
3...5VX1060  
20.9/25.6  
560  
3...5VX1060  
20.9/25.6  
560  
Type  
50% Non Mod  
50% Non Mod  
Motor Hp  
10  
15  
Motor Frame Size  
215T  
254T  
Efficiency at Full Load (%)  
Standard Efficiency  
89.5  
91.7  
89.5  
91.7  
High Efficiency  
Fan Pulley Pitch Diameter (in.)  
Motor Pulley Pitch Diameter (in.)  
Fan Rpm  
20.0  
20.0  
4.5  
4.0  
362  
371  
Belts Quantity...Model No.  
Center Distance Range (in.)  
Maximum Allowable Rpm  
2...BX90  
24.9/27.4  
600  
3...BX90  
23.9/26.8  
600  
Table 3 — Compressor Oil Charge  
OIL CHARGE (pints)  
Compressor  
Circuit A  
Compressor  
Circuit B  
UNIT 48/50MP  
Total Circuit A  
Total Circuit B  
A1  
19  
19  
19  
19  
19  
A2  
—
B1  
19  
19  
19  
19  
19  
B2  
—
62L  
70M  
82N  
90P  
10R  
19  
33  
33  
38  
38  
19  
19  
38  
38  
38  
14  
14  
19  
19  
—
19  
19  
19  
Table 4 — Variable Frequency Drive (VFD) Physical Data  
DIMENSIONS (in.)  
FAN MOTOR  
HP  
WEIGHT (lb)  
Height  
24.02  
24.02  
30.91  
30.91  
33.46  
Width  
12.99  
12.99  
12.99  
12.99  
12.99  
Length  
11.22  
11.22  
11.22  
11.22  
11.22  
30  
40  
50  
60  
75  
68  
68  
106  
106  
106  
6
Download from Www.Somanuals.com. All Manuals Search And Download.  
NOTES:  
1. Roof curb is shipped disassembled.  
2. Roof curb: 14 gage [VA03-56] steel.  
3. Dimensions in [ ] are in millimeters.  
4. To prevent standing water in the drain pan of the  
indoor section, roof curb and unit must be level  
within tolerances shown.  
NOTES:  
1. To prevent the hazard of stagnant water build-up in the drain pan on the indoor section, unit cannot  
exceed leveling tolerances shown.  
2. If a Carrier roof curb is not used, curb cross rails must be postioned to clear unit base rail locations  
shown.  
Fig. 1 — Roof Curb Dimensions, 48/50MP62L and 70M  
7
Download from Www.Somanuals.com. All Manuals Search And Download.  
NOTES:  
1. Roof curb is shipped disassembled.  
2. Roof curb: 14 gage [VA03-56] steel.  
3. Dimensions in [ ] are in millimeters.  
4. To prevent standing water in the drain pan of the  
indoor section, roof curb and unit must be level  
within tolerances shown.  
NOTES:  
1. To prevent the hazard of stagnant water build-up in the drain pan on the indoor section, unit cannot  
exceed leveling tolerances shown.  
2. If a Carrier roof curb is not used, curb cross rails must be postioned to clear unit base rail locations  
shown.  
Fig. 2 — Roof Curb Dimensions, 48/50MP82N-10R  
8
Download from Www.Somanuals.com. All Manuals Search And Download.  
WEIGHT  
A
B
C
D
E
F
UNIT SIZE  
48MPD,E  
lb  
kg  
mm  
3505  
3647  
ft-in.  
mm  
957  
ft-in.  
3-111⁄16  
3-97⁄8  
mm  
5909  
6166  
ft-in.  
mm  
1203  
1264  
ft-in.  
3-113⁄8  
4- 13⁄4  
mm  
ft-in.  
mm  
ft-in.  
62L  
16,810  
18,060  
7624  
8190  
11- 6  
19-45⁄8  
20-23⁄4  
13 011  
13 297  
42-81⁄4  
43-71⁄2  
14 256  
14 542  
46-91⁄4  
47-81⁄2  
70M  
11-119⁄16  
1165  
NOTES:  
1. Dimensions in [ ] are in millimeters.  
2.  
Center of gravity includes exhaust fan and high heat options. Unit weight does not include exhaust fan or high  
heat options.  
3. High heat add: 260 lb [118 kg]  
Exhaust fan add: 1675 lb [761 kg] on 62L  
1775 lb [807 kg] on 70M  
4. Unit clearances:  
Top — Do not restrict condenser fans, control box end — 6Ј-0Љ.  
Sides — 6Ј-0Љ (except on return fan equipped units — 10Ј-0Љ).  
Economizer end — 6Ј-0Љ (except power exhaust units — 10Ј-0Љ).  
For smaller service and operational clearances, contact Carrier Application Engineering Department.  
5. Downshot ducts designed to be attached to accessory roof curb. If unit is mounted on dunnage, it is recommended  
the ducts be supported by cross braces as done on the accessory roof curb.  
Fig. 3 — Base Unit Dimensions, 48MP62L, 70M  
9
Download from Www.Somanuals.com. All Manuals Search And Download.  
WEIGHT  
A
B
C
D
E
F
UNIT SIZE  
48MPD,E  
lb  
kg  
mm  
3646  
1938  
1938  
ft-in.  
mm  
—
ft-in.  
—
8-51⁄4  
8-51⁄4  
mm  
6734  
7283  
7268  
ft-in.  
mm  
1753  
1765  
1759  
ft-in.  
5-9  
5-91⁄2  
5-91⁄4  
mm  
ft-in.  
mm  
ft-in.  
82N  
90P  
10R  
22,660  
24,660  
25,110  
10 295  
11 203  
11 408  
11-119⁄16  
6- 45⁄16  
6- 45⁄16  
22- 11⁄8  
23-103⁄4  
23-101⁄8  
13 957  
14 821  
14 821  
45-91⁄2  
48-71⁄2  
48-71⁄2  
15 202  
16 066  
16 066  
49-101⁄2  
52- 81⁄2  
52- 81⁄2  
2572  
2572  
NOTES:  
1. Dimensions in [ ] are in millimeters.  
4. Unit clearances:  
Top — Do not restrict condenser fans, control box end — 6Ј-0Љ.  
Sides — 6Ј-0Љ (except on return fan equipped units — 10Ј-0Љ).  
Economizer end — 6Ј-0Љ (except power exhaust units — 10Ј-0Љ).  
2.  
Center of gravity includes exhaust fan and high heat options. Unit weight  
does not include exhaust fan or high heat options.  
For smaller service and operational clearances, contact Carrier Application En-  
gineering Department.  
5. Downshot ducts designed to be attached to accessory roof curb. If unit is mounted  
on dunnage, it is recommended the ducts be supported by cross braces as done  
on the accessory roof curb.  
3. High heat add: 260 lb [118 kg]  
Exhaust fan add: 2275 lb [1034 kg] on 82N  
2400 lb [1090 kg] on 90P and 10R  
Fig. 4 — Base Unit Dimensions, 48MP82N-10R  
10  
Download from Www.Somanuals.com. All Manuals Search And Download.  
WEIGHT  
C1  
C2  
UNIT  
SIZE  
50MP  
A
B
D
E
F
(See Note 3)  
(See Note 2)  
(See Note 2)  
lb  
16,550 7511 3505 11Ј- 6Љ  
17,800 8078 3647 11Ј-119⁄16Љ 1165 3Ј-97⁄8  
kg  
mm  
ft-in.  
mm  
957 3Ј-111⁄16Љ 5880 19Ј-31⁄2  
6166 20Ј-23⁄4  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
1203 3Ј-113⁄8  
1264 4Ј- 13⁄4  
Љ
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
62L  
Љ
6325 20Ј-9Љ  
6649 21Ј-93⁄4  
Љ
13 011 42Ј-81⁄4  
13 297 43Ј-71⁄2  
Љ
Љ
14 256 46Ј-91⁄4  
14 542 47Ј-81⁄2  
Љ
Љ
70M  
Љ
NOTES:  
Sides — 6Ј-0Љ  
1. Dimensions in [ ] are in millimeters.  
Economizer End — 6Ј-0Љ (Except power exhaust units 10Ј-0Љ).  
Control Box End — 6Ј-0Љ  
2.  
Center of gravity. Use appropriate column for units with or without  
exhaust fan option.  
For smaller service and operational clearances, contact Carrier Application  
Engineering department.  
5. Downshot ducts designed to be attached to accessory roof curb. If unit is  
mounted on dunnage, it is recommended the ducts be supported by cross  
braces as done on the accessory roof curb.  
3. Unit weight does not include exhaust fan option.  
Exhaust fan add: 1675 lb [761 kg] on 62L  
1775 lb [807 kg] on 70M  
4. Unit clearances:  
Top — Do not restrict condenser fans.  
6. All lifting lugs must be used when rigging unit.  
Fig. 5 — Base Unit Dimensions, 50MP62L and 70M  
11  
Download from Www.Somanuals.com. All Manuals Search And Download.  
WEIGHT  
C1  
C2  
UNIT  
SIZE  
50MP  
A
B
D
E
F
(See Note 3)  
(See Note 2)  
(See Note 2)  
lb  
kg  
mm  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
7180 23Ј-611⁄16Љ 1753 5Ј-9Љ  
7787 25Ј-69⁄16Љ 1765 5Ј-91⁄2  
7793 25Ј-613⁄16Љ 1759 5Ј-91⁄4  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
82N  
90P  
10R  
22,400 10 295 3646 11Ј-119⁄16Љ  
—
—
6702 21Ј-117⁄8  
6Ј- 45⁄16Љ 2572 8Ј-51⁄4 7383 23Ј-103⁄4  
6Ј- 45⁄16Љ 2572 8Ј-51⁄4 7383 23Ј-101⁄8  
Љ
13 957 45Ј-91⁄2  
14 821 48Ј-71⁄2  
14 821 48Ј-71⁄2  
Љ
Љ
Љ
15 202 49Ј-101⁄2  
16 066 52Ј-81⁄2  
16 066 52Ј-81⁄2  
Љ
24,750 11 375 1938  
25,100 11 536 1938  
Љ
Љ
Љ
Љ
NOTES:  
Sides — 6Ј-0Љ  
1. Dimensions in [ ] are in millimeters.  
Economizer End — 6Ј-0Љ (Except power exhaust units 10Ј-0Љ).  
Control Box End — 6Ј-0Љ  
2.  
Center of gravity. Use appropriate column for units with or without ex-  
For smaller service and operational clearances, contact Carrier Application  
Engineering department.  
haust fan option.  
3. Unit weight does not include exhaust fan option.  
Exhaust fan add: 2275 lb [1034 kg] on 82N  
5. Downshot ducts designed to be attached to accessory roof curb. If unit is  
mounted on dunnage, it is recommended the ducts be supported by cross  
braces as done on the accessory roof curb.  
2300 lb [1090 kg] on 90R and 10R  
4. Unit clearances:  
Top — Do not restrict condenser fans.  
6. All lifting lugs must be used when rigging unit.  
Fig. 6 — Base Unit Dimensions, 50MP82N-10R  
12  
Download from Www.Somanuals.com. All Manuals Search And Download.  
NOTICE TO RIGGERS  
A
WEIGHT  
B
C
D
E
UNIT  
SIZE  
Unit 48MP  
lb kg  
Unit 50MP  
Exhaust Fan  
lb kg  
lb  
kg  
in.  
mm  
in.  
mm  
in.  
mm  
in.  
mm  
in.  
mm  
N/A  
N/A  
N/A  
62L 16,810  
70M 18,060  
7 624 16,550  
8 190 17,800  
7 507 1675  
8 074 1775  
760 71.25 1810 129.00 3277 112.44 2856 138.00 3505  
805 71.25 1810 129.00 3277 112.44 2856 143.56 3646  
1032 71.25 1810 139.56 3545 127.87 3248 143.56 3646  
N/A  
N/A  
N/A  
82N 22,660 10 295 22,400 10 161 2275  
90P 24,660 11 203 24,750 11 227 2400  
10R 25,110 11 408 25,100 11 385 2400  
1089 71.25 1810 139.56 3545 127.87 3248 177.56 4510 101.25 2572  
1089 71.25 1810 139.56 3545 127.87 3248 177.56 4510 101.25 2572  
NOTE: All lifting lugs must be used when rigging with eight or ten  
cables and spread with four or five 95 in. (2413 mm) and two  
‘‘B + C + D’’ long suitable spreader bars. Unit weight does not include  
exhaust fan option.  
1. All panels must be in place when rigging.  
2. Unit is not designed for handling by fork truck.  
Fig. 7 — Rigging Label  
2
3
B
4
1
A
CORNER WEIGHT (lb)  
DIMENSIONS (ft-in.)  
CORNER WEIGHT (lb)  
DIMENSIONS (ft-in.)  
UNIT  
48MP  
UNIT  
50MP  
1
2
3
4
A
B
1
2
3
4
A
B
62L  
70M  
82N  
90P  
10R  
5095 5000 4339 4051  
5337 5338 5290 3969  
6614 6326 6444 5651  
7156 6789 7330 6226  
7174 6897 7345 6254  
19- 45⁄8  
20- 23⁄4  
22- 11⁄8  
23-103⁄4  
23-101⁄8  
3-113⁄8  
4- 13⁄4  
5- 9  
5- 91⁄2  
5- 91⁄4  
62L  
70M  
82N  
90P  
10R  
4237 3967 5038 4933  
5258 3955 5185 5167  
6351 5571 6574 6279  
7211 6132 7045 6761  
7288 6196 7195 6820  
19- 31⁄2  
20- 23⁄4  
21-117⁄8  
23-103⁄4  
23-101⁄8  
3-113⁄8  
4- 13⁄4  
5- 9  
5- 91⁄2  
5- 91⁄4  
Fig. 8 — Unit Center of Gravity and Corner Weights  
13  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Field Electrical Connections  
IMPORTANT: The 48/50MP units generate, use, and  
can radiate radio frequency energy. If units are not in-  
stalled and used in accordance with these instructions,  
they may cause radio interference. They have been tested  
and found to comply with limits of a Class A com-  
puting device as defined by FCC (Federal Communi-  
cations Commission) regulations, Subpart J of Part 15,  
which are designed to provide reasonable protection  
against such interference when operated in a commer-  
cial environment.  
UNIT  
BASE  
RAIL  
PITCH DRAIN LINE  
TO OFFSET LINE  
FRICTION  
SEALANT  
SLAB  
2" MIN.  
7" MIN.  
SLAB MOUNT DRAIN  
Fig. 9 — Condensate Drain Piping Details  
POWER WIRING — Units are factory wired for 460-v as  
shown on the unit nameplate. The main terminal block is  
suitable for use with aluminum or copper wires. Maximum  
wire size is 500 MCM.  
Branch circuit for power supply to unit must be protected  
against ground fault or short circuit. Provide an overcurrent  
protection device in the branch circuit. The MOCP (Maxi-  
mum Overcurrent Protection) value for this device is shown  
on unit informative data plate.  
Make Electrical Connections  
POWER SUPPLY — Electrical characteristics of available  
power supply must agree with unit nameplate rating. Supply  
voltage must be within the limits shown in Table 5.  
When installing units, provide and install a unit safety dis-  
connect per NEC of adequate size. Refer to Electrical Data  
tables for disconnect sizing. Disconnect may incorporate branch  
circuit fusing (if local or national codes permit) but combi-  
nation disconnect fuse is not required. Disconnect must be  
able to be locked OFF.  
Field Wire Routing — Field wiring is brought into the unit  
through the bottom of the control box.  
A 35⁄8-in. hole for field power wiring and a 7⁄8-in. hole for  
24-v control wiring are provided in the bottom of the control  
box. Field-supplied couplings must be used when routing wir-  
ing into the control box.  
HOOD  
TOP  
FILTER  
RACK  
HOLD  
DOWN  
BARS  
HOOD  
SIDE  
BLOCK-OFF  
PLATE  
Fig. 10 — Outdoor Air Hoods Shipping Position  
Fig. 11 — Outdoor Air Hoods Installed  
14  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Disconnect must be located within sight of the unit and read-  
ily accessible from the unit in compliance with NEC  
Article 440-14.  
This amount of phase imbalance is satisfactory as it is be-  
low the maximum allowable 2%.  
All field wiring must comply with NEC and all local codes.  
Size wire based on MCA (Minimum Circuit Amps) value  
shown on the unit informative plate. See Fig. 12 for power  
wiring connections to the unit power terminal block and equip-  
ment ground.  
Operating voltage to the compressor must be within the volt-  
age range indicated on the unit nameplate. Voltages between  
phases must be balanced within 2%, and the current must be  
balanced within 10%. See Table 5 for unit electrical data.  
IMPORTANT: If the supply voltage phase imbalance  
is more than 2%, contact local utility immediately.  
Unit failure as a result of operation on improper line volt-  
age or excessive phase imbalance constitutes abuse and may  
cause damage to electrical components.  
Use the following formula to determine the percent voltage  
imbalance.  
% Voltage Imbalance  
max voltage deviation from average voltage  
= 100 x  
average voltage  
EXAMPLE: Supply voltage is 460-3-60.  
AB = 452 v  
BC = 464 v  
AC = 455 v  
LEGEND  
EQUIP  
GND  
NEC  
TB  
—
—
—
—
Equipment  
Ground  
National Electrical Code  
Terminal Block  
452 + 464 + 455  
Average Voltage =  
3
1371  
Fig. 12 — Field Power Wiring Connections  
=
3
457  
=
Determine maximum deviation from average voltage:  
(AB) 457 − 452 = 5 v  
(BC) 464 − 457 = 7 v  
(AC) 457 − 455 = 2 v  
Maximum deviation is 7 v.  
Determine percent voltage imbalance:  
7
% Voltage Imbalance = 100 x  
457  
= 1.53%  
15  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Table 5 — Electrical Data  
CONDENSER  
FAN  
POWER  
EXHAUST  
FAN MOTOR  
VOLTAGE  
RANGE  
COMP  
NO. A1  
COMP  
NO. A2  
COMP  
NO. B1  
COMP  
NO. B2  
EVAPORATOR  
FAN MOTOR  
UNIT  
48MP/  
50MP  
VOLTAGE  
3 Ph, 60 Hz  
MCA MOCP  
MOTORS  
Min Max RLA LRA RLA LRA RLA LRA RLA LRA Qty FLA Hp  
FLA  
Hp  
FLA  
—
11  
40  
—
11  
40  
—
11  
40  
—
11  
52  
—
11  
52  
—
11  
52  
—
11  
52  
—
11  
52  
—
11  
52  
—
14  
65  
—
14  
65  
—
14  
65  
—
14  
77  
—
14  
77  
—
14  
77  
Hp  
—
207.0  
218.0  
247.0  
219.0  
230.0  
259.0  
232.0  
243.0  
272.0  
235.0  
246.0  
287.0  
248.0  
259.0  
300.0  
262.9  
273.9  
314.9  
250.2  
261.2  
302.2  
266.5  
277.5  
318.5  
281.5  
292.5  
333.5  
288.5  
302.5  
353.5  
303.5  
317.5  
368.5  
327.5  
341.5  
392.2  
307.2  
321.1  
387.1  
322.1  
336.1  
399.1  
345.8  
359.8  
422.8  
250  
250  
300  
250  
250  
300  
250  
300  
300  
300  
300  
350  
300  
300  
350  
300  
350  
350  
300  
300  
350  
300  
300  
350  
350  
350  
400  
350  
350  
350  
350  
350  
400  
400  
400  
450  
350  
350  
450  
350  
400  
450  
400  
450  
500  
40  
30  
7.5  
30  
—
62L  
70M  
82N  
90P  
10R  
460  
460  
460  
460  
414 508 65.4 345  
—
—
65.4 345  
—
—
6
6
6
8
8
3.3  
3.3  
3.3  
3.3  
3.3  
1
1
1
1
1
52  
65  
52  
65  
77  
52  
65  
77  
65  
77  
96  
65  
77  
96  
40  
50  
40  
50  
60  
40  
50  
60  
50  
60  
75  
50  
60  
75  
7.5  
30  
—
7.5  
30  
—
7.5  
40  
—
414 508 46.8 253 34.6 173 65.4 345  
—
—
7.5  
40  
—
7.5  
40  
—
7.5  
40  
—
414 508 43.6 223 34.6 173 43.6 223 43.6 223  
414 508 43.6 223 46.8 253 43.6 223 46.8 253  
414 508 43.6 223 65.4 345 43.6 223 46.8 253  
7.5  
40  
—
7.5  
40  
—
10  
50  
—
10  
50  
—
10  
50  
—
15  
60  
—
460  
15  
60  
—
15  
60  
LEGEND  
COMP  
FLA  
—
Compressor  
—
—
—
—
—
—
Full Load Amps  
Hp  
Nominal Horsepower  
Locked Rotor Amps  
Minimum Circuit Amps (for wire sizing)  
Maximum Overcurrent Protection  
Rated Load Amps  
LRA  
MCA  
MOCP  
RLA  
16  
Download from Www.Somanuals.com. All Manuals Search And Download.  
pins E2 and E3, and an RJ11 female connector. The RJ11  
connector is used to tap into the CCN at the sensor. See RJ11  
Plug Wiring section on page 24 to connect the RJ11 con-  
nector to the CCN.  
Control Wiring — See Fig. 13 for sensor wiring con-  
nections to main and auxiliary control boxes. The recom-  
mended types of control wiring for 48/50MP unit devices  
are shown in Table 6.  
Table 6 — Recommended Sensor and  
Device Non-Shielded Cable  
Jumper MUST be in place between pins E2 and E3 or  
inaccurate readings could result.  
PART NO.  
MANUFACTURER  
To connect the space temperature sensor (Fig. 13):  
Regular Wiring  
1895  
Plenum Wiring  
Alpha  
American  
Belden  
—
A48301  
884421  
—
1. Connect one wire of the 3-conductor cable to terminal  
TH, one wire to terminal COM, and the other wire to ter-  
minal SW on terminal block 1 (TB1) located on the cover  
of the space temperature sensor using a 20 AWG twisted  
3-conductor cable rated for the application.  
A21451  
8205  
Columbia  
Manhattan  
Quabik  
D6451  
M13402  
6130  
M64430  
—
2. Connect the other ends of the wires to terminals 1, 2, and  
3 on TB3 located in the unit main control box. The wire  
from terminal SW MUST be connected to terminal 3.  
SENSORS — Sensors should be wired using single twisted  
pairs of 20AWG (American Wire Gage) conductor cable rated  
for the application, except for the T56 accessory sensor which  
requires 3-conductor cable.  
NOTE: Either the T55 or the T56 sensor must be con-  
nected for CV applications to function properly.  
SPACE TEMPERATUREAVERAGING —Applications that  
require averaging using multiple space temperature sensors  
can be satisfied using either 4 or 9 sensors as shown in  
Fig. 14.  
NOTE: Humidity and CO2 sensors must be powered from  
isolated 24-v power supplies.  
HUMIDITY CONTROLAND HOT WATER AND STEAM  
VALVES — These devices require 20 AWG twisted pair con-  
ductor cables rated for the application for the 4 to 20 mA  
signal.  
NOTE: Only Carrier sensors may be used for standard T55  
space averaging. Sensors must be used in multiples of 1, 4,  
and 9 only, with total sensors wiring not to exceed 1000 ft.  
However, space temperature reset can be accomplished with  
only one sensor.  
SPACE TEMPERATURE SENSOR (T55) — The space tem-  
perature sensor (P/N CEC0121448-01) is shipped standard  
with every unit, and is located in the main control box. Space  
temperature sensor wires are to be connected to terminals in  
the unit main control box. The space temperature sensor  
includes a terminal block (TB1), a jumper between pins E2  
and E3, and an RJ11 female connector. The RJ11 connector  
is used to tap into the Carrier Comfort Network (CCN) at  
the sensor. See RJ11 Plug Wiring section on page 24 to con-  
nect the RJ11 connector to the CCN. A 3-lead cable must  
run from the RJ11 connector to the unit for communication  
through the sensor.  
NOTE: Do not use T56 sensors for space temperature  
averaging because the 5 degree offset function will not work  
in a multiple sensor application.  
HEAT INTERLOCK RELAY (VAV Units Only — Not Nec-  
essary For Digital Air Volume Applications) — Variable air  
volume (VAV) units using optimal start (morning warm-up)  
and/or occupied heating require that room terminals be con-  
trolled to the fully open position when the unit goes into  
heating mode. The HIR (Heat Interlock Relay) function is  
provided for this control on DSIO no. 2, channel 60. When  
the unit goes into heating mode, the HIR is energized to pro-  
vide switch closure or opening (depending on how the field-  
supplied power source is set up) to open the room terminals.  
The field connections for the HIR are: Normally Closed, ter-  
minals 8 and 10 on TB3; and Normally Open, terminals 8  
and 9 on TB3. See Fig. 15.  
Jumper MUST be in place between pins E2 and E3 or  
inaccurate readings could result.  
To connect the space temperature sensor (Fig. 13):  
OPTION AND ACCESSORY CONTROL WIRING — The  
48/50MP units may be used in applications with additional  
control features, options, or accessories. Refer to the Con-  
trols and Troubleshooting manual for more information con-  
cerning installation and configuration of options and acces-  
sories. Figures 15 to 29 contain wiring information on the  
following features:  
• heat interlock relay (Fig. 15)  
• differential enthalpy sensor (Fig. 16)  
• remote start (Fig. 17)  
• accessory humidity control (Fig. 18)  
• fire/smoke control (Fig. 19)  
• indoor air quality (Fig. 20)  
• outdoor airflow control (Fig. 21)  
• timed discrete output (Fig. 22)  
• humidifier (Fig. 23)  
• hydronic heating (Fig. 24)  
• freezestat (Fig. 25)  
• remote supply air temperature/space temperature offset  
(Fig. 26)  
• transducer/thermistor (Fig. 27)  
• CCN Building Supervisor (Fig. 28)  
• variable frequency drive (VFD) (Fig. 29)  
1. Connect 1 wire of the twisted pair to terminal T1 (T55)  
and connect the other wire to terminal T2 on terminal  
block 1 (TB1) located on the cover of the space tempera-  
ture sensor using a 20 AWG twisted pair conductor cable  
rated for the application.  
2. Connect the other ends of the wires to terminals 1 and 2  
on TB3 located in the unit main control box.  
NOTE: This sensor should be installed for all applica-  
tions. For VAV (variable air volume) applications, it is  
used to control heating and cooling during unoccupied  
periods. For DAV (digital air volume) applications, it is  
used to maintain control of the space during linkage fail-  
ures with the TSM (terminal system manager).  
NOTE: Either the T55 or T56 sensor must be connect-  
ed for CV (constant volume) applications to function  
properly.  
SPACE TEMPERATURE SENSOR (T56) (CV Applica-  
tions Only)  
—
The space temperature sensor  
(P/N CEC0121503-01) wires are to be connected to termi-  
nals in the unit main control box. The space temperature  
sensor includes a terminal block (TB1), a jumper between  
17  
Download from Www.Somanuals.com. All Manuals Search And Download.  
LEGEND  
COM  
SW  
T
TB  
TH  
—
—
—
—
—
Common  
Switch  
Terminal  
Terminal Block  
Thermostat Heating  
Accessory  
Field Wiring  
*Constant volume applications only.  
Fig. 13 — Space Temperature Sensor Wiring  
18  
Download from Www.Somanuals.com. All Manuals Search And Download.  
RED  
BLK  
RED  
BLK  
TB3  
1
RED  
BLK  
RED  
BLK  
RED  
BLK  
2
TO PROCESSOR  
MODULE NO. 1  
SENSOR 1  
SENSOR 2  
SENSOR 3  
SENSOR 4  
SPACE TEMPERATURE AVERAGING — 4 SENSOR APPLICATION  
TB3  
RED  
RED  
BLK  
RED  
BLK  
1
2
BLK  
TO PROCESSOR  
MODULE NO. 1  
SENSOR 1  
SENSOR 2  
SENSOR 3  
RED  
BLK  
RED  
BLK  
SENSOR 4  
SENSOR 5  
SENSOR 6  
RED  
BLK  
RED  
BLK  
LEGEND  
TB  
—
Terminal Block  
Factory Wiring  
Field Wiring  
SENSOR 7  
SENSOR 8  
SENSOR 9  
SPACE TEMPERATURE AVERAGING — 9 SENSOR APPLICATION  
Fig. 14 — Space Temperature Sensor Averaging  
19  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FIELD-SUPPLIED  
24-V ISOLATED  
POWER SUPPLY  
ACCESSORY  
DSIO2  
J5  
OUTSIDE AIR  
RELATIVE HUMIDITY  
FIELD  
CONTROL  
WIRING  
TB3  
7
TB3  
8
12  
11  
10  
RED  
BLU  
ORN  
2
1
1
2
24V  
J1  
J1  
J2  
J2  
12  
13  
15  
9
FIELD-SUPPLIED  
24-V ISOLATED  
POWER SUPPLY  
10  
1
2
CHANNEL  
60  
1
2
24V  
LEGEND  
SPACE/RETURN  
RELATIVE HUMIDITY  
TB  
—
Terminal Block  
Field Wiring  
Component Terminal  
LEGEND  
— Terminal Block  
□
Terminal Block Terminal  
TB  
Field Wiring  
Fig. 15 — Heat Interlock Relay  
Component Terminal  
Terminal Block Terminal  
□
Fig. 18 — Accessory Humidity Control  
ENTHALPY  
CONTROL  
ENTHALPY  
SENSOR  
J7  
TB2  
6
PRESSURIZATION  
19  
PURGE  
22  
S
+
SR  
+
EVACUATION  
25  
REMOVE  
620 Ω  
SHUTDOWN  
28  
RESISTOR  
PSIO  
NO. 2  
LEGEND  
DIFFERENTIAL  
ENTHALPY SENSOR  
(RETURN AIR)  
TB  
—
Terminal Block  
Field Wiring  
Component Terminal  
Fig. 16 — Differential Enthalpy Sensor  
□
Terminal Block Terminal  
Fig. 19 — Fire/Smoke Control  
FIELD-SUPPLIED  
24-V ISOLATED  
POWER SUPPLY  
24V  
J7  
LEGEND  
+
16  
9
1
DSIO  
—
Relay Module  
INDOOR AIR  
QUALITY ACY  
Fig. 17 — Remote Start  
17  
10  
-
5
PSIO  
NO. 2  
Fig. 20 — Indoor Air Quality  
20  
Download from Www.Somanuals.com. All Manuals Search And Download.  
OUTDOOR  
AIR  
TB2  
PSIO  
NO. 2  
TO 24-V  
+
24V  
BRN  
RED  
9
J6  
37  
38  
ISOLATED  
-
24V  
10  
TRANSFORMER  
CFM ACY  
+
-
LEGEND  
HYD VLV  
TB  
—
Terminal Block  
Field Wiring  
HYDRONIC VALVE  
ACTUATOR  
Component Terminal  
□
Terminal Block Terminal  
LEGEND  
Fig. 21 — Outdoor Airflow Control  
TB  
—
Terminal Block  
Field Wiring  
Component Terminal  
Fig. 24 — Hydronic Heating  
PSIO  
NO. 2  
J7  
31  
6
Fig. 22 — Timed Discrete Output  
TB2  
LEGEND  
TB  
—
Terminal Block  
Field Wiring  
PSIO  
NO. 2  
J6  
Component Terminal  
□
Terminal Block Terminal  
+ 43  
HUMIDIFIER  
HUM VLV  
HHR  
ACTUATOR  
Fig. 25 — Freezestat  
-
44  
45  
HUMIDIFIER  
RELAY  
+
CARRIER PART NO.  
HK35AA001  
LEGEND  
TB  
—
Terminal Block  
Field Wiring  
Component Terminal  
Fig. 23 — Humidifier  
LEGEND  
CV  
VAV  
—
—
Constant Volume  
Variable Air Volume  
Fig. 26 — Remote Supply Air Temperature  
Reset/Space Temperature Offset  
21  
Download from Www.Somanuals.com. All Manuals Search And Download.  
PSIO NO. 1  
J7  
TRANSDUCER ACCESSORY  
_
BLK  
DPT1  
DPT2  
WHT  
WHT  
BRN  
BRN  
7
8
WHT  
WHT  
RES  
BLK  
+
_
RED  
BLK  
10K OHM  
1/2 WATT  
+
5%  
-
RED  
WHT  
10  
11  
WHT  
RES  
+
_
RED  
BLK  
10K OHM  
1/2 WATT  
+
5%  
-
BLK  
BLK  
SPT1  
SPT2  
WHT  
WHT  
13  
14  
RES  
+
_
RED  
BLK  
BLK  
BLK  
10K OHM  
1/2 WATT  
+
5%  
-
RED  
WHT  
WHT  
16  
17  
RES  
+
RED  
BLK  
10K OHM  
1/2 WATT  
4
TB3  
5
+
5%  
-
RED  
J7  
2
PSIO NO. 2  
6
7
SUCTION GAS  
TEMPERATURE  
THERMISTOR  
1
CHANNEL 31  
CHANNEL 32  
3
LEGEND  
SUCTION GAS  
TEMPERATURE  
THERMISTOR  
DPT  
SPT  
TB  
—
—
—
Duct Pressure  
Transducer  
5
6
2
Suction Pressure  
Transducer  
Terminal Block  
Fig. 27 — Transducer/Thermistor  
PSIO  
NO. 1  
COMM  
1
2
3
1
2
3
RED  
GRN  
BLK  
CCN NETWORK  
_
_
LEVEL II  
COMMUNICATIONS  
BUS (COMM)  
4
COMM 1  
Fig. 28 — CCN Building Supervisor  
22  
Download from Www.Somanuals.com. All Manuals Search And Download.  
VFD  
PEC (EXHAUST)  
IFC (SUPPLY)  
PECB (EXHAUST)  
IFCB (SUPPLY)  
T1  
L1  
(R)  
L1  
EFM  
(EXHAUST)  
IDFM  
(SUPPLY)  
T2  
T3  
L2  
L3  
(S)  
(T)  
L2  
L3  
GROUND  
460V  
SHIELD  
G
VOLTAGE  
SELECTOR  
(SUPPLY)  
PSIO1  
J6  
S1  
CHANNEL 16  
1
3
+
-
46  
FI  
IFR (SUPPLY  
PER (EXHAUST)  
FC  
47  
SC  
LEGEND  
(EXHAUST)  
PSIO1  
EFM  
IDFM  
IFC  
—
Exhaust Fan Motor  
Indoor Fan Motor  
Indoor Fan Contactor  
Indoor Fan Circuit Breaker  
Indoor Fan Relay  
Power Exhaust Contactor  
Power Exhaust Circuit Breaker  
Power Exhaust Relay  
Variable Frequency Drive  
—
—
—
—
—
—
—
—
J6  
CHANNEL 15  
IFCB  
IFR  
43  
44  
+
PEC  
PECB  
PER  
VFD  
-
Fig. 29 — Optional VFD — Wiring Connections  
outer jacket of PVC, PVC/nylon, chrome vinyl, or Teflon  
with a minimum operating temperature range of Ϫ20 C to  
60 C is required. See Table 7 for cables that meet the  
requirements.  
Carrier Comfort Network Interface — The  
48/50MP units can be connected to the CCN if desired. The  
communication bus wiring is supplied and installed in  
the field. It consists of shielded, 3-conductor cable with  
drain wire.  
The system elements are connected to the communication  
bus in a daisy chain arrangement. The positive pin of each  
system element communication connector must be wired to  
the positive pins of the system element on either side of it,  
the negative pins must be wired to the negative pins, and the  
signal pins must be wired to signal ground pins. Wiring con-  
nections for CCN should be made at the 4-pin plug (COMM)  
located at the bottom right side of the fuse bracket in the  
main control box. Consult CCN Contractor’s Manual for fur-  
ther information.  
Table 7 — CCN Connection Approved  
Shielded Cables  
MANUFACTURER  
Alpha  
CABLE PART NO.  
2413 or 5463  
A22503  
American  
Belden  
8772  
Columbia  
02525  
IMPORTANT: When connecting the CCN communi-  
cation bus to a system element, use a color coding sys-  
tem for the entire network to simplify installation and  
checkout.  
NOTE: Conductors and drain wire must be 20 AWG mini-  
mum stranded, tinned copper. Individual conductors must  
be insulated with PVC, PVC/nylon, vinyl, Teflon, or poly-  
ethylene. An aluminum/polyester 100% foil shield and an  
23  
Download from Www.Somanuals.com. All Manuals Search And Download.  
The following color code is recommended:  
RJ11 PLUG WIRING — Units on the CCN can be moni-  
tored from the space at the sensor through the RJ11 con-  
nector, if desired. To wire the RJ11 connector into the CCN  
(Fig. 30):  
SIGNAL  
TYPE  
CCN BUS CONDUCTOR  
INSULATION COLOR  
COMM1 PLUG  
PIN NO.  
ϩ
GROUND  
Ϫ
RED  
1
2
3
WHITE  
BLACK  
IMPORTANT: The cable selected for the RJ11 con-  
nector wiring MUST be identical to the CCN com-  
munication bus wire used for the entire network. Re-  
fer to Table 7 for acceptable wiring.  
NOTE: If a cable with a different color scheme is selec-  
ted, a similar color code should be adopted for the entire  
network.  
At each system element, the shields of its communication  
bus cables must be tied together. If the communication  
bus is entirely within one building, the resulting continuous  
shield must be connected to a ground at one point only. If  
the communication bus cable exits from one building and  
enters another, the shields must be connected to grounds at  
the lightning suppressor in each building where the cable  
enters or exits the building (one point per building only).  
To connect the unit to the network:  
1. Turn off power to the control box.  
2. Cut the CCN wire and strip the ends of the red (ϩ), white  
(ground) and black (Ϫ) conductors. (If a different net-  
work color scheme is used, substitute appropriate  
colors.)  
1. Cut the CCN wire and strip ends of the red (ϩ), white  
(ground), and black (Ϫ) conductors. (If another wire color  
scheme is used, strip ends of appropriate wires.)  
2. Insert and secure the red (ϩ) wire to pin J2 (T-55) or CCN  
+ (T-56) of the space temperature sensor terminal block  
(TB1).  
3. Insert and secure the white (ground) wire to pin J3 (T-55)  
or CCN GND (T-56) of the space temperature sensor TB1.  
4. Insert and secure the black (Ϫ) wire to pin J5 (T-55) or  
CCN − (T-56) of the space temperature sensor TB1.  
5. Connect the other end of the communication bus cable to  
the remainder of the CCN communication bus at the  
COMM1 plug located on the fuse and control circuit breaker  
bracket in the unit main control box.  
3. Remove the 4-pin female plug from the fuse and control  
circuit breaker bracket in the main control box, and con-  
nect the wires as follows:  
Air Pressure Tubing — Before options such as supply  
fan VFD and modulating power exhaust can operate prop-  
erly, the pneumatic tubes for pressure sensing must be in-  
stalled. The recommended field-supplied tubing for this use  
a. Insert and secure the red (ϩ) wire to terminal 1 of the  
4-pin plug.  
1
is a nominal ⁄4-in., fire-retardant tubing.  
b. Insert and secure the white (ground) wire to terminal  
2 of the 4-pin plug.  
The tubing must be run from the appropriate location  
in the building to the auxiliary control box in the unit.  
Figures 31 and 32 show the location and layout of the  
auxiliary control box in the 48/50MP unit. Figure 33 shows  
the connection locations for the tubing on the duct pressure  
(DP) controller for the VFD on the supply fan and on the  
building pressure (BP) controller for the VFD on the modu-  
lating power exhaust fan.  
c. Insert and secure the black (Ϫ) wire to terminal 3 of  
the 4-pin plug.  
4. Insert the plug into the existing 4-pin mating connector  
on the fuse or control circuit breaker bracket in the main  
control box.  
IMPORTANT: A shorted CCN bus cable will pre-  
vent some routines from running and may prevent  
unit from starting. If abnormal conditions occur, un-  
plug the connector. If conditions return to normal,  
check CCN connector, and run new cable if nec-  
essary. A short in one section of the bus can cause  
problems with all system elements on the bus.  
The tubing for the duct pressure control (DP) should sample  
2
supply duct pressure about ⁄3 of the way out from the unit  
in the main trunk duct. The tubing for the building pressure  
control (BP) should sample building pressure in the area near  
the entrance lobby so that location is controlled as closely to  
design pressures as possible.  
LEGEND  
CCN  
—
—
—
—
Carrier Comfort Network  
Common  
Communications  
Ground  
COM  
COMM  
GND  
*Constant volume applications only.  
Fig. 30 — Space Sensor to Communication Bus Wiring  
24  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Fig. 31 — Auxiliary Control Box Location  
(50MP70M Unit Shown)  
VARIABLE  
FREQUENCY  
DRIVE  
BPC  
DPC  
DUCT PRESSURE  
TRANSDUCER  
HI  
LO  
HI  
LO  
TO  
BUILDING  
PRESSURE  
BUILDING PRESSURE  
TRANSDUCER  
(HIDDEN)  
FACTORY  
INSTALLED  
TUBING  
TO SUPPLY  
DUCT  
FIELD  
INSTALLED  
TUBING  
TO OUTDOOR  
REFERENCE  
PRESSURE  
PORT  
LEGEND  
BPC  
DPC  
—
—
Building Pressure Controller  
Duct Pressure Controller  
Fig. 33 — Air Pressure Tubing Locations  
Fig. 32 — Auxiliary Control Box  
25  
Download from Www.Somanuals.com. All Manuals Search And Download.  
INLET HOOD  
(62L AND 70M  
SIZES ONLY)  
GAS HEAT  
SECTION  
PANEL  
Gas Piping (48 Series Units Only) — Unit is equipped  
for use with natural gas only. Installation must conform with  
local building codes, or in the absence of local codes, with  
the National Fuel Gas Code, ANSI Z223.1.  
A 1⁄8-in. NPT tapping plug, accessible for test gage con-  
nection, must be field installed immediately upstream of gas  
supply connection to unit, but after manual gas valve. See  
Fig. 34. Natural gas pressure at unit gas connection must not  
be less than 5 in. wg or greater than 13 in. wg.  
FLUE HOOD  
AND FLUE  
DEFLECTOR  
HOOD  
Size gas supply piping for 0.5 in. wg maximum pressure  
drop. Do not use supply pipe smaller than unit gas  
connection.  
Disconnect gas piping from unit when leak testing at  
pressures greater than 0.5 psig. Pressures greater than  
0.5 psig will cause gas valve damage resulting in a haz-  
ardous condition. If gas valve is subjected to pressure  
greater than 0.5 psig, it must be replaced.  
HIGH HEAT  
UNITS ONLY  
Installing Flue/Inlet Hoods (48MP Units Only)  
— The flue/inlet hoods are shipped in a bag taped to the  
Fig. 35 — Flue and Inlet Hood Locations  
(48MP Units Only)  
basepan in the gas section of the unit.  
UNITS SIZES 62LAND 70M — The high heat units (48MPE),  
have 3 flue hoods, 3 flue deflector hoods, and one inlet air  
hood to be field installed. See Fig. 35. The low heat units  
(48MPD) have 2 flue hoods, 2 flue deflector hoods, and one  
inlet air hood.  
INLET HOOD  
Remove the shipping block offs and shipping tape from  
the flue openings in the access panel and the corner post.  
The inlet hood is shipped unassembled and must be as-  
sembled before mounting to the access panel. See Fig. 36.  
Install inlet screen on inlet hood using speed clips and screws  
provided.  
Attach the flue hoods to access panel and corner post us-  
ing screws provided. See Fig. 37. Hoods go over each com-  
bustion air outlet.  
INLET HOOD  
SIDE PLATE  
(TYP EACH SIDE)  
Install the flue deflector baffle inside the flue deflector hood.  
See Fig. 38. Install flue deflector hoods over each flue hood.  
UNIT SIZES 82N, 90P, and 10R — The high heat units  
(48MPE), have 3 flue hoods and 3 flue deflector hoods to be  
field installed. See Fig. 35. The low heat units (48MPD),  
have 2 flue hoods and 2 flue deflector hoods.  
Remove the shipping block offs and shipping tape from  
the flue openings in the access panel and the corner post.  
Fig. 36 — Inlet Hood Assembly  
Attach the flue hoods to access panel and corner post us-  
ing screws provided. See Fig. 37. Hoods go over each com-  
bustion air outlet.  
Install the flue deflector baffle inside the flue deflector hood.  
See Fig. 38. Install the flue deflector hoods over each flue  
hood.  
Fig. 37 — Flue Hood  
*NPT plug is field supplied.  
NOTE: Follow all local codes.  
Fig. 34 — Gas Piping Details  
26  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FLUE DEFLECTOR  
BAFFLE  
FLUE  
DEFLECTOR  
HOOD  
Check Compressor Mounting  
PUSH  
UNITS 48/50MP62L — Compressors are mounted on pans  
and are held down by 4 rail bolts during shipment. After unit  
is installed, loosen each of these bolts until the snubber washer  
can be moved with finger pressure. See Fig. 40 and 41.  
BAFFLE  
DOWN SO  
THESE 2  
HOLES  
ALIGN  
UNITS 48/50MP70M-10R — Compressors are mounted on  
rails and held down by rail bolts during shipment. After unit  
is installed, loosen the rail bolts to allow the rails and com-  
pressors to float freely on the springs located under the rails.  
See Fig. 40, 42, and 43.  
Install Accessories — For applications requiring  
special accessories, the following packages are available: con-  
denser coil hail guard package, condenser coil protective  
grilles, and compressor security grilles. Refer to the acces-  
sory installation instructions for information on accessory  
installation.  
TOP (WHEN INSTALLED)  
Fig. 38 — Flue Deflector Baffle (Assembled)  
Fan Isolator Adjustment — Remove shipping hard-  
ware from both the supply fan and the optional exhaust fan.  
The indoor fan shipping blocks on both the supply fan and  
the optional power exhaust fan (4 per fan) must be removed  
from each corner of the fan sled before starting unit. Re-  
move shipping bolt connecting bottom flanges of the fan sled  
crossrail with the fan support rail. Remove the wooden ship-  
ping block from each corner. See Fig. 39.  
FAN SLED  
ADJUSTING BOLT  
CROSS RAIL  
FAN SUPPORT  
RAIL  
7"  
SHIPPING  
BOLT  
After removing all shipping blocks, level fan sled using  
the adjusting screws of the spring isolators. Verify dimen-  
sions from fan support rail to fan sled cross rail of 7-in. on  
all 4 corners.  
To adjust, loosen the locknut on top of the adjusting bolt.  
Turn the bolt clockwise to decrease the height. Turn the bolt  
counterclockwise to increase the height. Tighten the locknut  
after adjustment is complete. Make sure that the fan sled  
assemblies float freely during and after adjustment.  
ISOLATOR SPRING  
METAL SHIPPING  
BLOCK  
VIEW FROM INSIDE UNIT LOOKING OUT  
Fig. 39 — Fan isolator Adjustment  
MOUNTING SPRINGS  
SHIPMENT BOLTS  
SHIPMENT BOLTS  
48/50MP62L  
MOUNTING  
BOLTS  
MOUNTING  
BOLTS  
RAIL BOLT (3) (2 SHOWN)  
RAIL BOLT (3) (2 SHOWN)  
48/50MP70M-10R  
Fig. 40 — Outer View, Compressor Mounting  
27  
Download from Www.Somanuals.com. All Manuals Search And Download.  
PRE-START-UP  
IMPORTANT: Before beginning Pre-Start-Up or Start-  
Up, review Start-Up Checklist at the center of this  
publication. The Checklist assures proper start-up of a  
unit and provides a record of unit condition, applica-  
tion requirements, system information, and operation  
at initial start-up.  
Do not attempt to start the air-conditioning system until  
following checks have been completed.  
System Check  
1. Check the outside air hoods to ensure the hoods are fully  
opened and secure, with filters in place.  
2. Check the supply fan and exhaust fan suspension brack-  
ets. Shipping spacers should be removed and sleds  
levelled to specification.  
Fig. 41 — Compressor Mounting —  
48/50MP62L Units  
3. Check compressor suspension. On 48/50MP62L units  
snubber washers can be moved with finger pressure. On  
all other units, rails allow compressors to float freely on  
compressor rail springs.  
4. Electrical power source must agree with unit  
nameplate.  
5. Check tightness of all electrical connections.  
Failure to open discharge service valve prior to start-  
ing compressor can result in damage to or failure  
of the compressor.  
6. Backseat (open) compressor suction and discharge shut-  
off valves. Close valves one turn to allow refrigerant pres-  
sure to reach the test gages.  
7. Open liquid line service valves.  
8. Oil should be visible in the compressor sight glasses.  
See Fig. 44. An acceptable oil level in the compressor  
is from 3⁄8 to 1⁄8 of sight glass (06E-299 compressors are  
1
⁄8  
of sight glass). Adjust the oil level as required. No oil  
should be removed unless the crankcase heater has been  
energized for at least 24 hours. Oil Charge section on  
page 49 for Carrier-approved oils.  
Fig. 42 — Front View of Compressor Mounting  
Rail Assembly — 48/50MP70M-10R Units  
9. Perform leak test. Be sure there are no refrigerant leaks.  
All units are shipped with a complete operating charge  
of R-22 and should be under sufficient pressure for leak  
testing after installation. If there is no system pressure,  
add refrigerant until a pressure is observed and check  
for leaks. After leaks are repaired, remove and recover  
refrigerant from system. For leak testing procedures, see  
GTAC 2, Module 5, Charging, Recovery, Recycling and  
Reclamation section. Do not use the system compres-  
sors to remove refrigerant from the system.  
COMPRESSOR MOUNTING FOOT  
10. Crankcase heaters must be firmly locked into compres-  
NUT  
sors, and must be on for 24 hours prior to start-up.  
COMPRESSOR MOUNTING RAIL  
Crankcase heaters on all units are wired into the  
control circuit, so they are always operable as long  
as the main power supply disconnect is on (closed),  
even if any safety device is open. Compressor heat-  
ers must be on for 24 hours prior to the start-up of  
any compressor.  
Fig. 43 — Rear View of Compressor Mounting  
Rail Assembly — 48/50MP70M-10R Units  
28  
Download from Www.Somanuals.com. All Manuals Search And Download.  
11. Check supply fan belts, sheaves, and bearings. Check  
the lubrication of the fan and motor bearings. Check bear-  
ing and bearing set screws for tightness. Check sheave  
alignment and belt tension. Hand turn fan to ensure fan  
wheel does not rub on housing. The fan shaft and motor  
shaft must turn freely before power is applied to the unit.  
12. Check exhaust fan belts, sheaves, and bearings. Check  
the lubrication of the fan and motor bearings. Check bear-  
ing and bearing set screws for tightness. Check sheave  
alignment and belt tension. Hand turn fan to ensure fan  
wheel does not rub on housing.  
Observe the maximum wheel speed and unit airflow lim-  
its for the specific unit size and fan type.  
See Tables 8-12 for forward curve supply fan perfor-  
mance. See Tables 13-17 for air foil supply fan perfor-  
mance.  
FAN PERFORMANCE, 48MP UNITS — To obtain fan per-  
formance for 48MP units:  
1. Enter fan performance table for appropriate base unit type  
and unit size.  
2. Determine the external static pressure from the fan per-  
formance table using fan type, field-measured rpm, and  
airflow (cfm).  
13. Check economizer linkage. Economizer dampers should  
be fully closed. Linkage should permit full and free travel.  
3. Refer to the Component Pressure Drops table (Table 18)  
on page 35. Calculate the adjusted external static pres-  
sure value for the correct unit size and airflow for gas  
heat units.  
4. Calculate the net external static pressure for the gas heat  
units by subtracting the adjusted external static pressure  
value from Table 18 (Step 3) from the external static pres-  
sure from the fan performnce table (Step 2).  
14. Check that the correct return air filters are installed in  
the filter tracks. Do not operate unit without return air  
filters.  
15. Check that all access doors on the air handler section  
have been closed and secured.  
16. Fan motors are 3-phase. Check rotation of fans during  
first start-up check. Fan rotation is clockwise as viewed  
from top of unit. If fan is not turning clockwise, reverse  
2 of the power wires.  
EXAMPLE:  
Field Measurements:  
Unit: 48MP62L  
Fan Type: Forward Curved  
RPM: 500  
CFM: 22,000  
Compressor Oil — Check that compressor oil is vis-  
ible in the sight glass of the compressor. All units are factory  
charged with oil. See Table 3. Observe oil level closely at  
start-up. If oil level is below the sight glass and cannot  
3
1
be seen, add oil until the level is approximately ⁄8 to ⁄8 of  
sight glass (06E-299 compressors are 1⁄8 of sight glass). See  
Fig. 44. See Oil Charge section on page 49 for information  
on adding or removing oil.  
1. Select Fan Performance Table 8, 48/50MP62L with For-  
ward Curved fan.  
2. Determine external static pressure using 500 rpm and  
22,000 cfm. ESP = 1.25.  
If oil charge is above sight glass, do not remove any oil  
until the compressor crankcase heater has been on for at least  
24 hours. When additional oil or a complete charge is needed,  
use only Carrier-approved compressor oil.  
Do not reuse drained oil and do not use any oil that has  
been exposed to the atmosphere.  
3. Read the adjusted external static pressure from the Com-  
ponent Static Pressure Drops table for 48MP62L gas  
heat units at 22,000 cfm. Adjusted ESP = 0.31.  
4. Calculate external static pressure.  
ESP = ESP − ESP Adjusted  
= 1.25 − 0.31  
= 0.94 in. wg  
COMPRESSOR  
06E  
COMPRESSOR  
06E-299  
Check rotation of wheel with arrow on the fan housing.  
Check fan speed with a strobe-type tachometer, or use this  
formula:  
(EXCEPT 06E-299)  
motor rpm x motor sheave pitch diameter (in.)  
Fan  
=
1/8  
Rpm  
fan sheave pitch diameter (in.)  
3/8  
1/8  
(Obtain motor rpm from the fan motor nameplate and read  
sheave pitch diameters marked on the fan and motor sheaves.)  
Fig. 44 — Operating Oil Levels  
(Sight Glass)  
EXAMPLE:  
Nameplate motor rpm . . . . . . . . . . . . . . . . . . . . . . . . . 1760  
Motor sheave pitch diameter (in.) . . . . . . . . . . . . . . . . . 6.4  
Fan sheave pitch diameter (in.) . . . . . . . . . . . . . . . . . . 12.4  
Evaporator-Fan Belts, Pulleys, and Sheaves —  
Belts, pulleys, and sheaves are factory installed. All pulleys  
are nonadjustable.  
See Table 1 for fan shaft center distance ranges and shaft  
sizes when making selections for field-supplied drives.  
1760 x 6.4  
Fan Rpm =  
= 908 Rpm  
12.4  
Factory-installed drives are fixed-speed and are non-  
adjustable. Refer to Table 1 for factory-supplied wheel speeds  
and drive set data.  
The maximum allowable fan speed for the supply fan is  
shown in Table 19. The maximum allowable fan speed for  
the power exhaust fan is shown in Table 20.  
If different wheel speeds are required for an application,  
Carrier recommends that the installer contact the nearest Brown-  
ing dealer. The Browning dealer can develop the required  
information for the fan drive set.  
Excessive fan speed may result in condensate carryover  
from the evaporator coil, fan motor overload, or wheel fail-  
ure. See Table 21 for Air Quantity Limits on page 35.  
29  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Table 8 — Fan Performance (Forward Curved) — 48/50MP62L*  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.50  
0.75  
1.00  
1.25  
1.50  
1.75  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
16,000  
18,000  
20,000  
22,000  
24,000  
26,000  
28,000  
30,000  
32,000  
346  
371  
398  
426  
455  
484  
514  
544  
575  
3.4  
4.7  
382  
404  
428  
454  
481  
508  
537  
566  
595  
4.1  
5.5  
415  
436  
458  
481  
506  
532  
559  
587  
615  
5.0  
6.4  
448  
466  
486  
508  
531  
555  
581  
608  
635  
6.0  
7.4  
478  
494  
513  
533  
555  
578  
602  
628  
654  
7.2  
8.6  
508  
522  
539  
558  
578  
600  
623  
648  
673  
8.6  
10.0  
11.9  
14.3  
17.3  
20.9  
25.2  
30.2  
36.1  
6.3  
7.2  
8.2  
9.3  
10.5  
12.9  
15.8  
19.4  
23.6  
28.5  
34.3  
8.4  
9.4  
10.5  
13.3  
16.6  
20.7  
25.4  
30.9  
11.6  
14.5  
18.0  
22.1  
26.9  
32.6  
11.0  
14.2  
18.0  
22.5  
27.9  
12.1  
15.4  
19.3  
23.9  
29.4  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
2.25 2.50  
AIRFLOW  
(Cfm)  
2.00  
2.75  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
16,000  
18,000  
20,000  
22,000  
24,000  
26,000  
28,000  
30,000  
32,000  
536  
549  
564  
582  
601  
622  
644  
667  
692  
10.1  
11.5  
13.4  
15.8  
18.9  
22.5  
26.9  
32.0  
38.0  
563  
575  
589  
605  
623  
643  
664  
686  
710  
11.9  
13.2  
15.1  
17.5  
20.6  
24.3  
28.7  
33.9  
39.9  
590  
600  
613  
628  
645  
664  
684  
705  
728  
13.9  
15.1  
16.9  
19.3  
22.4  
26.1  
30.6  
35.8  
42.0  
615  
624  
636  
650  
666  
684  
703  
724  
746  
16.0  
17.1  
18.9  
21.3  
24.3  
28.1  
32.6  
37.9  
44.1  
LEGEND  
Brake Horsepower  
Bhp  
—
*Refer to Fan Performance, 48MP Units section, for correct procedure on 48MP units.  
NOTES:  
1. Fan performance is based on wet coils and clean 2-in. filters.  
2. Conversion — Bhp to kW:  
Bhp × .746  
kW =  
Motor efficiency  
See Table 1 for motor efficiency.  
Table 9 — Fan Performance (Forward Curved) — 48/50MP70M*  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.50  
0.75  
1.00  
1.25  
1.50  
1.75  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
18,000  
20,000  
22,000  
24,000  
26,000  
28,000  
30,000  
32,000  
34,000  
36,000  
365  
391  
418  
447  
476  
506  
536  
566  
597  
628  
6.4  
8.2  
398  
421  
446  
472  
499  
527  
556  
585  
615  
645  
7.4  
9.3  
432  
451  
473  
497  
523  
549  
576  
604  
633  
662  
8.5  
10.4  
12.7  
15.4  
18.6  
22.2  
26.3  
30.9  
36.1  
41.9  
465  
482  
501  
523  
546  
571  
596  
623  
651  
679  
9.8  
11.7  
14.0  
16.8  
20.0  
23.6  
27.8  
32.5  
37.8  
43.7  
499  
512  
528  
548  
569  
592  
617  
642  
668  
695  
11.1  
13.1  
15.4  
18.2  
21.5  
25.2  
29.4  
34.2  
39.5  
45.4  
532  
542  
556  
573  
592  
614  
637  
661  
686  
712  
12.6  
14.5  
16.9  
19.7  
23.0  
26.8  
31.0  
35.9  
41.3  
47.3  
10.4  
12.9  
15.9  
19.4  
23.4  
27.9  
32.9  
38.6  
11.5  
14.1  
17.2  
20.8  
24.8  
29.4  
34.5  
40.2  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
2.50 2.75  
AIRFLOW  
(Cfm)  
2.00  
2.25  
300  
325  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
18,000  
20,000  
22,000  
24,000  
26,000  
28,000  
30,000  
32,000  
34,000  
36,000  
565  
572  
583  
598  
616  
635  
657  
680  
704  
729  
14.2  
16.1  
18.5  
21.3  
24.6  
28.4  
32.7  
37.6  
43.1  
49.1  
598  
602  
610  
623  
639  
657  
677  
699  
722  
746  
16.0  
17.8  
20.2  
23.0  
26.3  
30.1  
34.5  
39.4  
44.9  
51.0  
631  
631  
638  
648  
662  
679  
697  
718  
740  
763  
17.8  
19.6  
21.9  
24.7  
28.1  
31.9  
36.3  
41.3  
46.8  
53.0  
664  
661  
665  
673  
685  
700  
717  
737  
757  
780  
19.9  
21.5  
23.8  
26.6  
29.9  
33.8  
38.2  
43.2  
48.8  
55.0  
696  
691  
692  
698  
708  
722  
737  
756  
775  
796  
22.1  
23.6  
25.8  
28.5  
31.9  
35.7  
40.2  
45.2  
50.8  
57.1  
729  
720  
719  
723  
731  
743  
758  
774  
793  
813  
24.4  
25.8  
27.9  
30.6  
33.9  
37.7  
42.2  
47.2  
52.9  
59.2  
LEGEND  
Brake Horsepower  
Bhp  
—
*Refer to Fan Performance, 48MP Units section, for correct procedure on 48MP units.  
NOTES:  
1. Fan performance is based on wet coils and clean 2-in. filters.  
2. Conversion — Bhp to kW:  
Bhp × .746  
kW =  
Motor efficiency  
See Table 1 for motor efficiency.  
30  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Table 10 — Fan Performance (Forward Curved) — 48/50MP82N*  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.50  
0.75  
1.00  
1.25  
1.50  
1.75  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
22,000  
24,000  
26,000  
28,000  
30,000  
32,000  
34,000  
36,000  
38,000  
40,000  
42,000  
293  
308  
324  
341  
358  
375  
393  
411  
430  
448  
467  
6.2  
7.6  
326  
339  
352  
367  
382  
398  
415  
432  
449  
467  
485  
7.7  
9.1  
359  
369  
380  
393  
407  
421  
436  
452  
468  
485  
502  
9.3  
10.8  
12.6  
14.6  
16.8  
19.4  
22.3  
25.5  
29.1  
33.0  
37.3  
392  
399  
408  
419  
431  
444  
458  
473  
488  
504  
520  
11.2  
12.7  
14.5  
16.5  
18.9  
21.5  
24.5  
27.8  
31.4  
35.5  
39.9  
425  
429  
436  
445  
455  
467  
479  
493  
507  
522  
537  
13.2  
14.7  
16.6  
18.7  
21.1  
23.8  
26.8  
30.2  
33.9  
38.1  
42.6  
457  
459  
464  
471  
480  
490  
501  
513  
526  
540  
555  
15.3  
16.9  
18.8  
20.9  
23.4  
26.2  
29.3  
32.7  
36.5  
40.7  
45.4  
9.2  
10.8  
12.7  
14.9  
17.4  
20.2  
23.3  
26.8  
30.6  
34.9  
11.0  
13.1  
15.5  
18.2  
21.2  
24.6  
28.3  
32.5  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
2.25 2.50 2.75  
AIRFLOW  
(Cfm)  
2.00  
3.00  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
22,000  
24,000  
26,000  
28,000  
30,000  
32,000  
34,000  
36,000  
38,000  
40,000  
42,000  
462  
466  
472  
480  
489  
500  
512  
524  
538  
552  
567  
15.0  
16.6  
18.6  
20.8  
23.4  
26.2  
29.4  
32.9  
36.8  
41.0  
45.7  
489  
491  
495  
502  
510  
520  
530  
542  
555  
568  
582  
16.8  
18.5  
20.4  
22.7  
25.3  
28.1  
31.4  
34.9  
38.9  
43.2  
47.9  
515  
516  
519  
524  
531  
539  
549  
560  
572  
584  
598  
18.7  
20.4  
22.3  
24.6  
27.2  
30.2  
33.4  
37.0  
41.0  
45.4  
50.2  
541  
540  
542  
546  
551  
559  
568  
578  
589  
601  
613  
20.7  
22.4  
24.4  
26.7  
29.3  
32.2  
35.5  
39.2  
43.2  
47.7  
52.5  
567  
564  
564  
567  
572  
578  
586  
595  
605  
617  
629  
22.9  
24.5  
26.5  
28.8  
31.4  
34.4  
37.7  
41.4  
45.5  
50.0  
54.9  
LEGEND  
Brake Horsepower  
NOTES:  
1. Fan performance is based on wet coils and clean 2-in. filters.  
2. Conversion — Bhp to kW:  
Bhp  
—
*Refer to Fan Performance, 48MP Units section, for correct procedure on  
48MP units.  
Bhp × .746  
kW =  
Motor efficiency  
See Table 1 for motor efficiency.  
Table 11 — Fan Performance (Forward Curved) — 48/50MP90P*  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.50  
0.75  
1.00  
1.25  
1.50  
1.75  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
22,000  
24,000  
26,000  
28,000  
30,000  
32,000  
34,000  
36,000  
38,000  
40,000  
42,000  
44,000  
46,000  
297  
313  
330  
347  
365  
381  
400  
419  
439  
458  
478  
498  
518  
6.9  
8.5  
329  
343  
357  
373  
389  
400  
418  
437  
455  
474  
493  
512  
532  
7.9  
9.6  
360  
371  
384  
398  
412  
420  
437  
454  
472  
490  
508  
527  
546  
8.9  
10.7  
12.7  
14.9  
17.4  
19.4  
22.4  
25.8  
29.6  
33.7  
38.3  
43.2  
48.7  
375  
395  
410  
422  
436  
440  
455  
472  
488  
505  
523  
541  
559  
9.8  
11.7  
13.8  
16.2  
18.8  
21.0  
24.1  
27.5  
31.3  
35.5  
40.2  
45.2  
50.7  
402  
420  
430  
442  
449  
460  
474  
489  
505  
521  
538  
555  
573  
11.4  
13.2  
15.3  
17.4  
19.8  
22.7  
25.8  
29.3  
33.2  
37.4  
42.1  
47.2  
52.8  
430  
445  
452  
462  
469  
480  
493  
507  
522  
537  
553  
570  
587  
13.0  
14.8  
16.9  
19.0  
21.4  
24.5  
27.6  
31.2  
35.1  
39.4  
44.1  
49.3  
54.9  
10.3  
12.3  
14.6  
16.5  
19.4  
22.6  
26.2  
30.3  
34.7  
39.5  
44.8  
11.5  
13.6  
16.0  
17.9  
20.9  
24.2  
27.9  
32.0  
36.4  
41.3  
46.7  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
2.50 2.75  
AIRFLOW  
(Cfm)  
2.00  
2.25  
3.00  
3.25  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
22,000  
24,000  
26,000  
28,000  
30,000  
32,000  
34,000  
36,000  
38,000  
40,000  
42,000  
44,000  
46,000  
455  
465  
475  
486  
488  
501  
512  
525  
539  
553  
568  
584  
600  
14.5  
16.4  
18.5  
20.8  
23.0  
26.3  
29.5  
33.1  
37.1  
41.4  
46.2  
51.4  
57.1  
480  
485  
500  
510  
510  
522  
532  
543  
556  
569  
584  
599  
614  
16.0  
18.0  
20.5  
22.5  
24.8  
28.3  
31.5  
35.1  
39.1  
43.5  
48.3  
53.6  
59.3  
506  
515  
525  
531  
532  
542  
551  
561  
573  
585  
599  
613  
628  
17.8  
20.0  
22.5  
24.5  
26.5  
30.4  
33.6  
37.2  
41.2  
45.7  
50.5  
55.8  
61.6  
532  
545  
548  
552  
552  
563  
571  
580  
590  
602  
614  
628  
642  
19.5  
22.0  
24.5  
26.5  
28.6  
32.5  
35.8  
39.4  
43.5  
47.9  
52.8  
58.2  
64.0  
555  
568  
570  
572  
572  
585  
590  
598  
607  
618  
630  
642  
656  
21.5  
23.8  
26.2  
28.5  
30.8  
34.8  
38.1  
41.7  
45.7  
50.2  
55.2  
60.6  
66.4  
578  
590  
590  
592  
590  
602  
610  
617  
625  
634  
645  
657  
670  
23.5  
25.5  
28.0  
30.5  
33.0  
36.5  
40.4  
44.1  
48.1  
52.6  
57.6  
63.0  
68.0  
NOTES:  
LEGEND  
Brake Horsepower  
1. Fan performance is based on wet coils and clean 2-in. filters.  
2. Conversion — Bhp to kW:  
Bhp  
—
*Refer to Fan Performance, 48MP Units section, for correct procedure on  
48MP units.  
Bhp × .746  
kW =  
Motor efficiency  
See Table 1 for motor efficiency.  
31  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Table 12 — Fan Performance (Forward Curved) — 48/50MP10R*  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.50  
0.75  
1.00  
1.25  
1.50  
1.75  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
26,000  
28,000  
30,000  
32,000  
34,000  
36,000  
38,000  
40,000  
42,000  
44,000  
46,000  
48,000  
50,000  
52,000  
315  
330  
346  
368  
386  
405  
424  
443  
463  
482  
502  
521  
541  
561  
9.5  
11.2  
13.2  
15.6  
18.4  
21.5  
24.9  
28.7  
33.0  
37.6  
42.6  
48.1  
54.0  
60.5  
346  
359  
372  
386  
404  
421  
449  
458  
476  
495  
514  
533  
553  
572  
10.9  
12.7  
14.8  
16.9  
19.7  
22.9  
26.4  
30.3  
34.6  
39.2  
44.3  
49.9  
55.9  
62.4  
367  
380  
399  
415  
430  
446  
464  
473  
490  
509  
527  
546  
564  
583  
10.9  
14.0  
16.8  
18.8  
21.8  
24.4  
28.0  
31.9  
36.2  
41.0  
46.1  
51.7  
57.8  
64.4  
390  
401  
417  
438  
450  
468  
471  
487  
505  
522  
540  
558  
576  
594  
12.4  
14.9  
17.6  
20.8  
23.5  
26.3  
29.6  
33.6  
38.0  
42.8  
48.0  
53.6  
59.8  
66.4  
412  
422  
435  
461  
470  
489  
501  
513  
532  
542  
553  
570  
588  
606  
14.0  
16.0  
18.5  
22.8  
25.2  
28.2  
31.3  
35.3  
39.7  
44.6  
49.9  
55.6  
61.8  
68.5  
434  
446  
460  
490  
490  
506  
417  
530  
547  
556  
566  
582  
600  
617  
15.7  
17.7  
20.2  
24.1  
26.8  
30.1  
33.4  
37.1  
41.6  
46.5  
51.8  
57.6  
63.9  
70.6  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
2.50 2.75  
AIRFLOW  
(Cfm)  
2.00  
2.25  
3.00  
3.25  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
26,000  
28,000  
30,000  
32,000  
34,000  
36,000  
38,000  
40,000  
42,000  
44,000  
46,000  
48,000  
50,000  
52,000  
455  
470  
485  
500  
511  
522  
533  
547  
562  
570  
579  
595  
612  
629  
17.5  
19.5  
22.0  
25.5  
28.5  
32.0  
35.5  
39.8  
43.5  
48.4  
53.8  
59.7  
66.0  
72.8  
480  
490  
502  
519  
530  
538  
550  
562  
577  
584  
592  
607  
624  
640  
19.0  
21.2  
23.8  
27.5  
30.7  
33.7  
37.5  
41.3  
45.5  
50.5  
55.9  
61.8  
68.1  
75.0  
505  
510  
520  
538  
548  
555  
566  
576  
592  
598  
605  
620  
636  
652  
20.5  
23.0  
25.5  
29.5  
33.0  
35.5  
39.6  
42.9  
47.5  
52.5  
58.0  
63.9  
70.3  
77.2  
528  
532  
539  
558  
567  
574  
582  
592  
603  
608  
618  
633  
648  
663  
22.4  
24.7  
27.5  
31.1  
34.3  
37.3  
41.2  
45.0  
49.6  
54.7  
60.2  
66.1  
72.6  
79.5  
550  
555  
558  
577  
586  
592  
599  
608  
614  
619  
632  
646  
660  
675  
24.5  
26.5  
29.5  
32.8  
35.7  
39.1  
42.9  
47.1  
51.8  
56.9  
62.4  
68.4  
74.9  
81.9  
572  
580  
580  
595  
601  
608  
615  
622  
628  
633  
646  
659  
672  
687  
26.5  
29.0  
31.5  
35.1  
38.0  
41.4  
45.2  
49.4  
54.0  
59.1  
64.7  
70.8  
77.3  
84.3  
LEGEND  
Brake Horsepower  
NOTES:  
1. Fan performance is based on wet coils and clean 2-in. filters.  
2. Conversion — Bhp to kW:  
Bhp  
—
*Refer to Fan Performance, 48MP Units section, for correct procedure on  
48MP units.  
Bhp × .746  
kW =  
Motor efficiency  
See Table 1 for motor efficiency.  
Table 13 — Fan Performance (Air Foil) — 48/50MP62L*  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.25  
0.50  
0.75  
1.00  
1.25  
1.50  
1.75  
2.00  
833  
867 10.4  
909 12.2  
951 14.1  
2.25  
866  
2.50  
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp  
16,000  
18,000  
20,000  
22,000  
24,000  
26,000  
28,000  
30,000  
32,000  
581  
637  
698  
757  
815  
877 11.4  
937 13.9  
3.4  
4.5  
5.8  
7.4  
9.2  
620  
672  
730  
787  
843 10.2  
904 12.5  
962 15.1  
4.1  
5.2  
6.7  
8.4  
656  
706  
761  
815  
870 11.2  
929 13.7  
4.8  
6.0  
7.6  
9.3  
694  
738  
792  
843 10.2  
895 12.3  
953 14.8  
5.5  
6.8  
8.4  
731  
771  
820  
6.4  
7.6  
9.3  
765  
805  
849 10.1  
897 12.1  
946 14.3  
7.2  
8.5  
798  
837  
880 11.2  
922 13.0  
971 15.3  
8.0  
9.5  
9.0  
9.9  
898 10.8  
927 12.3  
965 14.3  
896 11.3  
938 13.2  
871 11.1  
921 13.3  
978 15.3 1005 16.4  
994 16.4 1019 17.5 1044 18.7  
977 15.9 1001 17.0 1024 18.1 1046 19.2 1068 20.3 1089 21.5  
986 16.3 1009 17.5 1031 18.7 1053 19.9 1075 21.1 1097 22.3 1118 23.5 1138 24.7  
995 16.6 1019 17.9 1042 19.2 1064 20.5 1085 21.8 1106 23.1 1126 24.4 1147 25.7 1168 26.9 1187 28.2  
1055 19.8 1078 21.2 1100 22.6 1121 23.9 1141 25.3 1161 26.7 1180 28.1 1199 29.5 1219 30.8 1238 32.2  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
2.75  
3.00  
3.25  
3.50  
3.75  
4.00  
4.25  
4.50  
4.75  
5.00  
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp  
16,000  
18,000  
20,000  
22,000  
24,000  
26,000  
28,000  
30,000  
32,000  
929 11.7  
957 13.4  
959 12.7  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
986 14.4 1015 15.5 1042 16.6 1068 17.7 1094 18.8  
991 15.4 1019 16.5 1046 17.6 1073 18.8 1099 19.9 1124 21.1 1149 22.3 1173 23.5 1197 24.7 1220 25.9  
1030 17.5 1055 18.7 1079 19.9 1103 21.1 1129 22.3 1154 23.6 1178 24.8 1202 26.1 1225 27.4 1248 28.7  
1069 19.9 1094 21.2 1117 22.4 1140 23.7 1163 24.9 1185 26.2 1207 27.6 1230 28.9 1253 30.3 1276 31.7  
1114 22.8 1137 24.1 1160 25.4 1183 26.8 1204 28.1 1226 29.5 1247 30.9 1267 32.2 1287 33.6 1308 35.1  
1158 25.9 1179 27.2 1201 28.6 1223 30.0 1244 31.4 1265 32.9 1286 34.3 1306 35.8 1326 37.2 1345 38.7  
1207 29.5 1226 30.8 1244 32.1 1264 33.5 1285 35.0 1305 36.5 1325 38.0 1345 39.5 1364 41.1 1383 42.6  
1257 33.5 1275 34.9 1293 36.3 1311 37.6 1328 39.0 1346 40.5 1366 42.1 1385 43.7 1404 45.3 1423 47.0  
LEGEND  
Brake Horsepower  
NOTES:  
1. Fan performance is based on wet coils and clean 2-in. filters.  
2. Conversion — Bhp to kW:  
Bhp  
—
*Refer to Fan Performance, 48MP Units section, for correct procedure on  
48MP units.  
Bhp × .746  
kW =  
Motor efficiency  
See Table 1 for motor efficiency.  
32  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Table 14 — Fan Performance (Air Foil) — 48/50MP70M*  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.50  
0.75  
1.00  
1.25  
1.50  
1.75  
2.00  
2.25  
2.50  
2.75  
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp  
18,000  
20,000  
22,000  
24,000  
26,000  
28,000  
30,000  
32,000  
34,000  
36,000  
668  
725  
781  
837 10.0  
898 12.3  
955 14.8  
5.1  
6.6  
8.2  
702  
756  
809  
5.9  
7.4  
9.1  
735  
787  
838 10.0  
890 12.1  
947 14.5  
6.7  
8.3  
767  
816  
865 10.9  
916 13.1  
971 15.6  
7.5  
9.1  
801  
8.4  
833  
9.3  
863 10.3  
905 12.0  
945 13.9  
893 11.2  
933 13.1  
973 15.0  
924 12.2  
961 14.1  
954 13.3  
987 15.2  
844 10.0  
892 11.9  
941 14.1  
875 11.0  
917 12.8  
966 15.1  
999 16.2 1025 17.3  
864 11.0  
923 13.4  
989 16.2 1013 17.3 1039 18.5 1065 19.7  
995 16.7 1018 17.8 1041 19.0 1063 20.1 1084 21.2 1108 22.5  
979 16.0 1002 17.2 1025 18.4 1047 19.6 1069 20.8 1091 21.9 1112 23.1 1133 24.3 1153 25.6  
1011 17.4 1034 18.8 1056 20.0 1078 21.3 1098 22.6 1119 23.9 1140 25.2 1160 26.5 1180 27.7 1200 29.0  
1071 20.7 1093 22.1 1114 23.5 1135 24.9 1154 26.2 1174 27.6 1193 29.0 1213 30.4 1232 31.7 1251 33.1  
1129 24.3 1150 25.7 1171 27.2 1190 28.7 1210 30.1 1228 31.6 1246 33.1 1264 34.6 1283 36.0 1301 37.4  
1186 28.1 1207 29.6 1226 31.2 1245 32.8 1264 34.3 1282 35.9 1299 37.4 1317 39.0 1334 40.5 1351 42.1  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
3.00  
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp  
983 14.3 1011 15.4 1039 16.4 1065 17.5 1091 18.6  
3.25  
3.50  
3.75  
4.00  
4.25  
4.50  
4.75  
5.00  
18,000  
20,000  
22,000  
24,000  
26,000  
28,000  
30,000  
32,000  
34,000  
36,000  
—
—
—
—
—
—
—
—
1014 16.3 1042 17.4 1069 18.6 1095 19.7 1120 20.9 1145 22.1 1169 23.3 1193 24.5 1216 25.8  
1050 18.5 1074 19.6 1098 20.8 1124 22.1 1149 23.3 1173 24.6 1197 25.9 1220 27.2 1243 28.5  
1089 20.9 1113 22.2 1136 23.4 1158 24.7 1180 26.0 1202 27.3 1226 28.6 1249 30.0 1271 31.4  
1132 23.8 1155 25.1 1177 26.4 1199 27.8 1221 29.1 1242 30.5 1262 31.9 1282 33.3 1303 34.7  
1172 26.8 1195 28.2 1217 29.6 1239 31.0 1260 32.5 1280 33.9 1300 35.4 1320 36.8 1340 38.3  
1219 30.3 1238 31.6 1256 32.9 1277 34.4 1298 35.9 1318 37.5 1338 39.0 1357 40.5 1376 42.1  
1270 34.4 1288 35.8 1305 37.2 1323 38.6 1340 40.0 1360 41.6 1379 43.2 1398 44.8 1417 46.4  
1319 38.9 1337 40.3 1354 41.8 1371 43.2 1388 44.7 1404 46.2 1420 47.7 1439 49.3 1457 51.0  
1369 43.6 1386 45.1 1403 46.6 1419 48.2 1435 49.7 1451 51.3 1467 52.8 1483 54.4 1498 55.9  
LEGEND  
Brake Horsepower  
NOTES:  
1. Fan performance is based on wet coils and clean 2-in. filters.  
2. Conversion — Bhp to kW:  
Bhp  
—
*Refer to Fan Performance, 48MP Units section, for correct procedure on  
48MP units.  
Bhp × .746  
kW =  
Motor efficiency  
See Table 1 for motor efficiency.  
Table 15 — Fan Performance (Air Foil) — 48/50MP82N*  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.25 1.50 1.75 2.00  
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp  
AIRFLOW  
(Cfm)  
0.50  
0.75  
1.00  
2.25  
2.50  
2.75  
20,000  
22,000  
24,000  
26,000  
28,000  
30,000  
32,000  
34,000  
36,000  
38,000  
40,000  
42,000  
449  
477  
505  
535  
563  
595  
4.1 485  
4.9 511  
5.9 538  
7.0 565  
8.1 591  
5.0 519  
5.9 543  
7.0 568  
8.1 594  
6.0 551  
7.0 574  
8.1 598  
7.0 583  
8.1 602  
8.1 616  
9.4  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
9.2 631 10.3 661 11.7  
9.2 626 10.4 652 11.6 677 12.9 706 14.3 733 15.8  
9.3 622 10.5 649 11.7 675 13.0 699 14.4 723 15.7 748 17.2 773 18.7  
9.3 619 10.6 646 11.9 671 13.2 697 14.5 721 15.9 744 17.3 766 18.8 787 20.2  
9.6 621 10.8 647 12.1 673 13.5 698 14.9 721 16.3 745 17.8 767 19.3 789 20.8 810 22.3  
624 11.0 649 12.3 673 13.7 698 15.2 722 16.6 745 18.1 767 19.6 789 21.2 811 22.8 831 24.4  
655 12.7 679 14.1 702 15.6 725 17.1 748 18.7 770 20.2 792 21.8 813 23.4 834 25.0 854 26.7  
685 14.6 709 16.1 731 17.6 752 19.2 771 20.8 796 22.4 817 24.1 838 25.8 857 27.5 877 29.2  
717 16.7 739 18.3 761 19.9 781 21.5 801 23.2 822 24.9 843 26.6 863 28.4 882 30.1 901 31.9  
748 18.9 769 20.5 789 22.2 809 24.0 829 25.7 848 27.4 868 29.3 888 31.1 907 32.9 925 34.8  
779 21.3 799 23.1 819 24.8 838 26.6 857 28.4 875 30.3 894 32.1 913 34.0 931 35.9 950 37.9  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
3.00  
3.25  
3.50  
3.75  
4.00  
4.25  
4.50  
4.75  
5.00  
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp  
20,000  
22,000  
24,000  
26,000  
28,000  
30,000  
32,000  
34,000  
36,000  
38,000  
40,000  
42,000  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
798 20.3  
812 21.9 835 23.6 858 25.3  
831 23.8 851 25.4 874 27.2 896 29.1 917 30.9  
851 26.0 871 27.6 890 29.3 910 31.0 931 32.9 952 34.9 972 36.8 992 38.8  
874 28.4 893 30.1 912 31.8 930 33.6 948 35.3 966 37.2 986 39.2 1006 41.3 1025 43.4  
896 31.0 915 32.7 934 34.5 952 36.3 969 38.2 986 40.0 1003 41.9 1021 43.8 1039 46.0  
920 33.7 938 35.6 956 37.5 974 39.4 991 41.3 1008 43.2 1025 45.1 1041 47.1 1057 49.0  
943 36.6 961 38.5 978 40.5 996 42.4 1013 44.4 1030 46.4 1046 48.4 1062 50.4 1078 52.5  
967 39.8 984 41.8 1001 43.7 1018 45.8 1035 47.8 1052 49.9 1068 52.0 1084 54.0 1099 56.2  
LEGEND  
Brake Horsepower  
NOTES:  
1. Fan performance is based on wet coils and clean 2-in. filters.  
2. Conversion — Bhp to kW:  
Bhp  
—
*Refer to Fan Performance, 48MP Units section, for correct procedure on  
48MP units.  
Bhp × .746  
kW =  
Motor efficiency  
See Table 1 for motor efficiency.  
33  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Table 16 — Fan Performance (Air Foil) — 48/50MP90P*  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.50  
0.75  
1.00  
1.25  
1.50  
1.75  
2.00  
2.25  
2.50  
2.75  
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp  
24,000  
26,000  
28,000  
30,000  
32,000  
34,000  
36,000  
38,000  
40,000  
42,000  
44,000  
46,000  
501  
531  
561  
591  
621 10.6  
651 12.5  
681 14.3  
713 16.3  
743 18.5  
774 20.9  
806 23.5  
837 26.3  
5.70 534  
8.78 581  
7.98 588  
6.78 565  
7.93 591  
7.89 594  
9.05 622 10.2 649 11.5 674 12.7 702 14.1 729 15.6  
—
—
9.12 619 10.3  
646 11.6 672 12.9 696 14.2 720 15.5 745 17.0 770 18.5  
9.20 617 10.5  
644 11.7  
670 13.3  
695 15.0  
721 16.9  
748 18.9  
777 21.2  
805 23.5  
834 26.2  
863 29.1  
892 32.1  
669 13.1 695 14.4 719 15.8 742 17.2 764 18.6 788 20.1  
695 14.7 718 16.1 742 17.8 765 19.1 787 20.6 808 22.1  
719 16.5 742 18.0 764 19.5 787 21.0 806 22.6 829 24.2  
744 18.4 767 20.0 789 21.5 810 23.1 831 24.8 851 26.4  
770 20.5 792 22.1 813 23.8 833 25.4 853 27.1 873 28.9  
797 22.9 818 24.6 839 26.3 856 28.0 878 29.8 897 31.8  
824 25.3 843 27.0 863 28.8 883 30.6 902 32.5 921 34.3  
853 28.0 871 29.8 889 31.7 908 33.5 927 35.3 945 37.4  
882 31.0 900 32.9 917 34.8 934 38.7 953 38.7 971 40.7  
910 34.1 928 36.0 945 38.0 961 40.0 978 42.1 995 44.2  
9.36 618 10.6  
644 12.0  
670 13.6  
698 15.4  
727 17.3  
758 19.6  
785 21.8  
814 24.4  
844 27.2  
874 30.2  
645 12.2  
676 13.9  
704 15.8  
735 18.0  
763 20.1  
794 22.5  
825 25.4  
856 28.2  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
3.50 3.75 4.00 4.25 4.50  
AIRFLOW  
(Cfm)  
3.00  
3.25  
4.75  
5.00  
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp  
24,000  
26,000  
28,000  
30,000  
32,000  
34,000  
36,000  
38,000  
40,000  
42,000  
44,000  
46,000  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
795 20.1  
810 21.7 833 23.4 856 25.1  
828 23.6 849 25.2 871 27.0 893 28.8 915 30.7  
849 25.8 859 27.4 888 29.1 907 30.8 928 32.7 949 34.6 969 36.6 969 38.8  
871 28.1 890 29.8 909 31.6 927 33.3 945 35.0 963 36.9 983 38.9 1003 41.0 1022 43.0  
893 30.6 912 32.4 930 34.2 948 36.0 966 37.8 983 38.9 1000 41.5 1017 43.4 1036 45.6  
916 33.4 935 35.2 953 37.1 971 39.0 988 40.0 1005 42.8 1022 44.7 1038 46.7 1054 48.6  
939 36.2 956 38.1 974 40.0 992 42.0 1009 43.9 1025 45.9 1042 44.9 1058 49.9 1074 52.0  
963 39.3 980 41.3 997 43.3 1014 45.3 1031 47.3 1048 49.4 1064 51.5 1080 53.5 1095 55.6  
988 42.7 1005 44.6 1022 45.6 1038 48.9 1054 51.0 1070 53.1 1086 55.2 1102 57.4 1118 59.6  
1013 46.2 1029 48.4 1046 50.5 1062 52.6 1077 54.8 1093 56.9 1108 59.1 1124 61.4 1139 63.6  
LEGEND  
Brake Horsepower  
NOTES:  
1. Fan performance is based on wet coils and clean 2-in. filters.  
2. Conversion — Bhp to kW:  
Bhp  
—
*Refer to Fan Performance, 48MP Units section, for correct procedure on  
48MP units.  
Bhp × .746  
kW =  
Motor efficiency  
See Table 1 for motor efficiency.  
Table 17 — Fan Performance (Air Foil) — 48/50MP10R*  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.25 1.50 1.75 2.00  
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp  
AIRFLOW  
(Cfm)  
0.50  
0.75  
1.00  
2.25  
2.50  
2.75  
26,000  
28,000  
30,000  
32,000  
34,000  
36,000  
38,000  
40,000  
42,000  
44,000  
46,000  
48,000  
50,000  
52,000  
525  
554  
584  
6.55 555  
7.69 582  
7.69 585  
8.88 613 10.1 641 11.3  
667 12.6  
689 14.1  
712 15.7  
736 17.5  
760 19.5  
784 21.5  
810 23.9  
836 26.3  
863 29.0  
890 31.8  
918 34.9  
946 38.3  
975 41.9  
692 13.9  
713 15.5  
735 17.2  
758 19.0  
782 21.0  
805 23.2  
831 25.8  
855 28.1  
881 30.8  
907 33.7  
935 38.0  
963 40.3  
715 15.3  
736 16.9  
758 18.7  
780 20.6  
803 22.8  
826 24.8  
851 27.3  
875 29.9  
900 32.7  
925 35.0  
952 38.9  
979 42.4  
739 16.7  
759 18.3  
781 20.2  
802 22.1  
824 24.3  
846 26.5  
871 29.1  
894 31.7  
919 34.6  
943 37.6  
968 40.9  
765 18.2  
781 19.7  
802 21.7  
823 23.7  
845 25.9  
866 28.2  
890 30.9  
913 33.6  
937 35.5  
961 39.6  
986 43.0  
8.90 610 10.2  
637 11.4 663 12.7  
663 13.0 688 14.3  
688 14.6 712 16.1  
714 16.4 737 17.9  
740 18.3 761 19.9  
769 20.5 789 22.2  
797 22.9 817 24.6  
825 25.4 844 27.2  
853 28.1 872 29.9  
882 31.0 900 33.0  
911 34.2 929 36.2  
941 37.5 958 39.8  
9.00 611 10.3  
636 11.6  
663 13.2  
691 14.9  
719 15.8  
748 18.9  
776 21.2  
805 23.6  
834 26.2  
864 29.1  
894 32.2  
924 38.5  
954 39.0  
613 10.4  
643 12.0  
672 13.7  
704 15.7  
734 17.8  
765 20.1  
795 22.5  
826 25.2  
857 28.2  
889 31.4  
919 34.7  
639 11.8  
667 13.5  
696 15.2  
726 17.3  
755 19.5  
785 21.9  
815 24.3  
845 27.2  
876 30.2  
907 33.4  
937 35.9  
995 44.5 1011 46.6  
991 44.0 1007 46.1 1023 48.3 1038 50.5  
970 41.2 986 43.4 1003 45.6 1019 47.8 1035 50.0 1050 52.2 1065 54.5  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
3.50 3.75 4.00 4.25 4.50  
AIRFLOW  
(Cfm)  
3.00  
3.25  
4.75  
5.00  
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp  
26,000  
28,000  
30,000  
32,000  
34,000  
36,000  
38,000  
40,000  
42,000  
44,000  
46,000  
48,000  
50,000  
52,000  
790 19.8  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
804 21.3 828 23.0 851 24.7  
823 23.2 843 24.8 865 26.5 887 28.3 909 30.2 930 32.0  
844 25.3 863 27.0 882 28.6 901 30.3 922 32.2 943 34.1 964 36.0 984 38.0  
865 27.6 884 29.3 903 31.0 921 32.7 939 34.5 957 36.2 977 38.3 997 40.3 1016 42.4  
886 30.0 905 31.7 924 33.5 942 35.3 959 37.2 977 39.0 994 40.8 1010 40.3 1029 44.5  
909 32.7 927 34.5 946 38.3 964 38.2 981 40.1 998 42.0 1015 43.9 1031 45.9 1047 47.8  
931 35.4 949 37.3 967 39.2 985 41.2 1002 43.2 1019 45.1 1038 47.1 1052 49.1 1068 61.2  
955 35.5 973 40.4 990 42.2 1007 44.4 1024 46.4 1040 48.5 1057 50.5 1073 52.6 1089 54.7  
978 41.6 996 43.6 1013 45.7 1029 47.7 1045 49.8 1061 51.9 1077 54.0 1093 56.2 1109 58.4  
1003 45.1 1020 47.2 1037 49.3 1053 51.4 1069 53.6 1084 55.7 1100 57.9 1115 60.1 1139 63.6  
1028 48.7 1044 50.9 1061 53.1 1077 55.3 1092 57.5 1108 59.7 1123 62.0 1137 64.2 1152 66.5  
1053 52.7 1069 54.9 1085 57.2 1101 59.4 1116 61.7 1132 64.0 1146 65.3 1161 68.7 1175 71.0  
1080 56.8 1094 59.0 1109 61.4 1125 63.7 1140 66.1 1165 68.4 1170 70.8 1184 73.2  
LEGEND NOTES:  
Brake Horsepower  
—
—
1. Fan performance is based on wet coils and clean 2-in. filters.  
2. Conversion — Bhp to kW:  
Bhp  
—
*Refer to Fan Performance, 48MP Units section, for correct procedure on  
48MP units.  
Bhp × .746  
kW =  
Motor efficiency  
See Table 1 for motor efficiency.  
34  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Table 18 — Component Pressure Drop (in. wg)  
COMPONENT  
22,000 26,400 30,000 34,000 38,000 42,000 45,800 48,200 52,000  
HEAT EXCHANGER  
(48MP ONLY)  
0.31  
0.40  
0.49  
0.58  
0.70  
0.82  
0.95  
1.03  
1.23  
Table 19 — Maximum Allowable  
Supply Fan Wheel Speed (Rpm)  
and nominal cfm delivery. See Table 22 for clean filter pres-  
sure drops for help in locating the ‘‘pivot’’ point. Once this  
point is found, turn the screw clockwise to obtain the set  
point at which the filter status will be dirty. Use Table 22 as  
a guide.  
FAN TYPE  
48/50MP  
Forward Curved  
Airfoil  
1595  
1298  
62L, 70M  
835  
715  
82N, 90P, 10R  
Table 22 — Filter Switch Dirty Set Point  
INCREASED  
Table 20 — Maximum Allowable Power Exhaust  
Fan Speed (Rpm)  
PRESSURE DROP  
TO ‘‘DIRTY’’  
FROM PIVOT  
POINT  
APPROXIMATE  
CLOCKWISE  
TURNS  
FILTER TYPE  
FAN TYPE  
48/50MP  
50% Air  
690  
100% Air  
650  
2-in. Throwaway  
0.30 in. wg  
2
5
62L, 70M  
4-in. Pleated with  
2-in. Throwaway  
0.75 in. wg  
82N, 90P, 10R  
600  
560  
Table 21 — Air Quantity Limits (cfm)  
ENTHALPY CONTROL SET POINT — The enthalpy sen-  
sor (See Fig. 45) is located behind the filters in the right side  
economizer hood and is accessed through the filter access  
door. For maximum benefit of outdoor air, set enthalpy sen-  
sor control to the A setting. At this setting, when the relative  
humidity is 50%, and the outdoor air is below 74 F, the sen-  
sor’s relay contacts will be closed. See Fig. 46 and 47.  
MINIMUM  
MINIMUM  
UNIT  
GAS HEATING GAS HEATING  
SIZE MINIMUM MAXIMUM  
48/50MP  
(Low Heat  
Units)  
48MPD  
(High Heat  
Units)  
48MPE  
62L  
70M  
82N  
90P  
10R  
16,000  
18,000  
21,000  
23,000  
26,000  
32,000  
36,000  
42,000  
46,000  
52,000  
12,850  
12,850  
14,700  
14,700  
14,700  
15,400  
15,400  
19,250  
19,250  
19,250  
NOTE: Enthalpy control setting dial is on the enthalpy  
control.  
Economizer Damper Linkage Adjustment — When replac-  
ing economizer damper motors, or if the linkage has come  
loose, it is critical that the linkages be adjusted correctly.  
They are sensitive, and incorrect adjustment can cause the  
motor to stall. Check linkage for free movement and com-  
plete range of travel.  
Minimum Position Set Point — Minimum economizer po-  
sition is set using the keypad and display module. Refer to  
Control and Troubleshooting literature for more details.  
Controls Configuration and Quick Test  
SUPPLY FAN STATUS SWITCH (FS) —Asnap acting single-  
pole, double-throw (SPDT) differential pressure switch is fac-  
tory mounted in the auxiliary control box. The switch senses  
the change in pressure across the supply-air fan and pro-  
vides the fan status. A length of plenum tubing connects the  
switch to the probe located in the fan discharge box.  
The switch must be set prior to unit operation. To set the  
switch, turn the adjustment screw on top (center) of switch  
clockwise to increase set point, or counterclockwise to  
decrease set point. The set point switch range is 0.05 to  
2.0 in. wg with a deadband of 0.02 in. wg at minimum set  
point and 0.1 in. wg at maximum set point.  
Set switch so that contact makes to NC when supply-air  
fan is energized. The switch should make (fan on) within  
1 minute after supply-air fan is energized and break (fan off)  
within 1 minute after the fan is deenergized.  
ENTHALPY  
SENSOR  
CHECK FILTER SWITCH (CFS) — A snap acting SPDT  
switch is factory mounted in the auxiliary control box. The  
switch senses the differential pressure and provides the micro-  
processor module with a signal for filter status. Two lengths  
of plenum tubing connect the switch to probes located both  
upstream and downstream of the unit filters.  
The switch must be set prior to unit operation. To set the  
switch, turn the adjustment screw on top (center) of switch  
slowly clockwise to find the ‘‘pivot’’ point where the filter  
status still reads clean under  
in the HSIO display.  
Fig. 45 — Enthalpy Sensor  
Check the switch operation with the supply-air fan running  
35  
Download from Www.Somanuals.com. All Manuals Search And Download.  
The HSIO keypad and display module is installed by con-  
necting the power and communication plugs and can be  
easily moved from one unit to another. Because of this flex-  
ibility, one HSIO can be used for several units.  
Unit operation is controlled by the status of the run/  
standby mode on the HSIO. To access the mode, press  
CONTROL POINT  
(Approx Deg F)  
AT 50% RH  
CONTROL  
CURVE  
on the HSIO keypad, and then press  
.
The HSIO will display either STBY YES or STBY NO.  
CLEAR  
ENTER  
To enable the unit, press  
or  
and press  
while  
at the STBY YES display. To disable the unit, press  
ENTER  
while at the STBY NO display. Clearing an alarm  
that has stopped unit operation is accomplished by entering  
the STBY YES mode.  
IMPORTANT: Use the STBY YES mode when ser-  
vicing the unit or running the quick test feature.  
IMPORTANT: If remote start function is used, place  
LOCAL/REMOTE switch in Local (OFF) position when  
ever unit is placed in STBY YES.  
SET UNIT TYPE — The correct unit type must be set. The  
default unit type is VAV. If the unit is being used in a VAV  
application, then the unit type does not need to be changed.  
Table 23 — HSIO Keypad Key Usage  
Fig. 46 — Psychrometric Chart for  
Enthalpy Control  
FUNCTION  
USE  
KEYS  
Status — To display diagnostic codes and  
current operating information about the unit.  
Quick Test — To check inputs and outputs for  
proper operation.  
History — To check most recent alarms.  
Service — To enter specific unit configuration  
information.  
Set Point — To enter operating set points and  
day/time information.  
Schedule — To enter occupied/unoccupied  
schedules for unit operation.  
OPERATIVE  
USE  
KEYS  
Expand Display — To display a non-  
abbreviated expansion of the display.  
Clear — To clear the screen and return to previous  
NOTES:  
CLEAR  
display. Also used to enter data value  
1. Switches shown in high enthalpy state. Terminals 2 and 3 close on enthalpy  
decrease.  
of zero.  
2. When standard economizer is used with accessory differential enthalpy sen-  
sor, set enthalpy control to ‘‘D’’ setting.  
Up Arrow — To return to previous display position.  
Fig. 47 — Wiring Connections for Solid-State  
Enthalpy Sensor (HH57AC077)  
Down Arrow — To advance to next display position.  
ENTER  
To enter data.  
KEYPAD AND DISPLAY MODULE (HSIO)  
CONFIGURATION  
IMPORTANT: The HSIO keypad and display module  
is required for initial start-up of these units. All units  
are shipped in standby mode, and the HSIO should be  
used to change the unit to run mode. Once the unit is  
in run mode, the HSIO is not required for normal  
operation.  
TEST  
ALRM  
EXPN  
EDIT  
SRVC  
HIST  
STAT  
SET  
1
4
2
5
8
0
3
6
9
ALGO  
SCHD  
CLEAR  
ENTER  
7
-
The keypad and display module provides unit function in-  
formation at the unit. See Fig. 48. The module consists of a  
keypad with 6 function keys, 5 operative keys, 10 numeric  
keys (0 through 9), and an alphanumeric 8-character liquid  
crystal display (LCD). Key usage is explained in Table 23.  
Each function has one or more subfunctions.  
Fig. 48 — Keypad and Display Module (HSIO)  
36  
Download from Www.Somanuals.com. All Manuals Search And Download.  
If the unit is being used in a CV application, then perform  
the following:  
For example, the occupied cool set point is currently set  
at the default value of 78 F. To change the occupied set point  
to 72 F:  
1. Enter the configuration function by pressing  
.
and  
1. Press  
to enter the occupied cool set point  
function. The display will read OCSP 78.  
2. Scroll down to unit type. TYPE 1 will be displayed.  
ENTER  
2. Press  
and the display will read OCSP 72.  
ENTER  
3. Press  
and  
to change the unit type to CV.  
Set points can be changed by the user provided that the  
values are within the allowable range for the input. If the  
input is not within the allowable range, the original value  
will remain displayed. See Table 24 for allowable ranges and  
default values.  
To change the demand limit set points, the functions must  
first be enabled in the field configuration subfunction.  
4. Scroll down to data reset. DTRS will be displayed. Press  
ENTER  
and  
to save changes.  
The fan operation type should also be configured for  
use in occupied time periods. Fan operation can be  
set to continuous or auto. To set, press  
to enter  
CONFIGURE UNIT CONTROLS AND FUNCTIONS —  
Refer to Table 25 for a suggested sequence for entering  
Basic System Configuration data. These values may be changed  
from the HSIO at any time. If changing default values via  
the CCN, the 48/50MP unit must first be in run mode  
(STBY NO).  
the subfunction. Scroll down to fan mode (FANM). Press  
ENTER  
ENTER  
and  
to continuous.  
to set to AUTO. Press  
and  
to set  
ENTER JOB SET POINT VALUES — The set point func-  
tion allows the user to view the current values set for the  
unit. From this function, the user can change the values.  
NOTE: After changing any of the values in the  
configuration group, enable the Data Reset function.  
Reading and Changing Set Points — To change the set point  
of a particular feature, enter the appropriate subfunction and  
scroll to the variable desired. Once the desired variable has  
QUICK TEST FUNCTION — Enable and run the Quick Test  
function. Refer to the Controls and Troubleshooting manual  
for more information on Quick Test.  
ENTER  
been reached, type in the new value and press  
new value will appear in the display.  
. The  
Table 24 — Set Point Ranges and Defaults  
SET POINT  
DEFAULT  
VALUE  
ALLOWABLE  
RANGE  
DISPLAY  
BPSP  
DESCRIPTION  
Building pressure set point  
Economizer set point offset  
High humidity override (percent)  
High temperature minimum position  
Humidity set point (percent)**  
IAQ set point  
0.05 in. wg  
3
0 to .50 in. wg  
1 to 10  
ECSO*  
HHL†/HHOR*  
HTMP  
99%  
35 F  
40%  
650 ppm  
10 F  
50%  
10 F  
20%  
50 F  
1 cfm  
78 F  
68 F  
90%  
3 F  
0 to 100%  
0 to 100 F  
0 to 100%  
0 to 2000 ppm  
0 to 20 F  
HUSP  
IAQS†  
LIMT†  
LSP  
Reset limit (F)  
Loadshed set point (percent)  
Low temperature minimum position  
Minimum damper position (percent)  
NTFC lockout temperature (F)  
Outdoor-air cfm set point  
0 to 100%  
0 to 100 F  
0 to 100%  
40 to 70 F  
0 to 50,000 cfm  
55 to 80 F  
55 to 80 F  
30 to 100%  
0 to 10 F  
LTMP  
MDP†  
NTLO†  
OLS†/OACS*  
OCSP  
Occupied cool set point (F)**  
Occupied heat set point (F)**  
Power exhaust on set point (percent)  
Reset ratio (F)  
OHSP  
PES†  
RTIO†  
SASP  
Supply air set point (F)  
55 F  
1.5 in. wg  
1
45 to 70 F  
0 to 5.0 in. wg  
0 to 10  
SPSP  
Static pressure set point††  
Unoccupied cooling deadband  
Unoccupied cool set point (F)**  
Unoccupied heating deadband  
Unoccupied heat set point (F)**  
UCDB*  
UCSP  
90 F  
1
75 to 95 F  
0 to 10  
UHDB*  
UHSP  
55 F  
40 to 80 F  
LEGEND  
IAQ  
NFTC  
ppm  
—
—
—
Indoor-Air Quality  
Unoccupied Free Cooling  
Parts Per Million  
*These items are found under the Service function, and can only be accessed using either the Build-  
ing Supervisor or Service Tool.  
†These items are found under the Service function.  
**Occupied space.  
††Supply duct.  
NOTE: Set points HHL/HHOR and OCS/OACS are displayed differently on the HSIO and Building Su-  
pervisor. The set points are shown as HHL and OCS on the HSIO. The set points are shown as HHOR  
and OACS on Building Supervisor or Service Tool.  
37  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Table 25 — Basic Configuration Data  
SET POINT  
Unit Type  
SUBFUNCTION  
DISPLAY  
DEFAULT  
RANGE  
TYPE  
1 = VAV  
1 (Continuous)  
20 percent  
68 (F)  
CV = 0, VAV = 1  
CV Fan Mode  
FANM  
MDP  
Auto = 0, Cont = 1  
0 to 100  
55 to 80  
55 to 80  
75 to 95  
40 to 80  
0 to 5.0  
Economizer Minimum  
Damper Position  
Heating Occupied*  
Cooling Occupied  
Cooling Unoccupied  
Heating Unoccupied  
Static Pressure  
OHSP  
OCSP  
78 (F)  
UCSP  
90 (F)  
UHSP  
55 (F)  
SPSP  
1.5 (in. wg)  
55 (F)  
Supply Air Temperature  
Date and Time  
SASP  
45 to 70  
—
TIME  
dow.hh.mm mm.dd.yy  
0 (hrs)  
Override Schedules†  
Schedule I Periods  
LEGEND  
OVRD x HR  
OCC HH.MM  
0, 1, 2, 3 or 4  
—
—
CV  
VAV  
—
—
Constant Volume  
Variable Air Volume  
*Requires Occupied Heating function enabled.  
†See text section for discussion and instructions.  
Gas Pressure Check — Prior to performing the Quick  
Test, install gas pressure gages and jumper as follows:  
START-UP  
1. Turn off manual gas stop valve.  
Initial Check  
2. Install a jumper between HR1-NO and HR2-NO.  
3. Connect pressure gage to gas supply pressure tap. See  
Fig. 34.  
4. Connect pressure gage to manifold pressure tap on each  
gas manifold.  
IMPORTANT: Do not attempt to start unit, even mo-  
mentarily, until all items on the Start-Up Checklist and  
the following steps have been completed.  
1. Verify unit has been installed per the Installation section  
of this literature.  
2. Certify that all auxiliary components (sensors, controls,  
etc.) have been installed and wired to the control boxes  
per these instructions, the Controls and Troubleshooting  
literature and the unit wiring label diagrams.  
3. Verify that pressure hoses (static, duct, etc.) are properly  
attached, routed, and free from pinches or crimps that may  
affect proper control operation.  
4. Set any control configurations that are required (field-  
installed accessories, etc.). The unit is factory configured  
for all appropriate factory-installed options with the  
applicable controls programmed to the default values. See  
unit Controls and Troubleshooting literature for appli-  
cable configuration values.  
5. Enter unit set points (if applicable). The unit is shipped  
with the set point default values shown in the Con-  
trols and Troubleshooting literature. If a different set point  
is required, change per the example shown under Set  
Point Function section in Controls and Troubleshooting  
literature.  
6. Configure schedule subfunctions (if applicable): occu-  
pied, unoccupied, and holiday periods. See Schedule Func-  
tion section in Controls and Troubleshooting literature for  
details on setting periods.  
5. Turn on manual gas stop valve.  
During the heating portion of the Quick Test,  
,
both the first and second stage of gas heat will be tested.  
During the first stage, all of the burner sections will operate  
at low fire condition (approximately 75% capacity). During  
the second stage, all of the burner sections will operate at  
100% capacity.  
During the Quick Test of stage 2, after the unit has been  
operating for several minutes, verify that the incoming gas  
line pressure is 5.5 in. wg or greater. Also, verify that the  
manifold pressure at each burner section is 3.3 in. wg. If  
manifold pressure must be adjusted, refer to the Gas Valve  
Adjustment section on page 52.  
After the unit has been in operation for 5 minutes, check  
the temperature rise across the unit heat exchangers. See the  
unit informative plate for correct rise range limits. Air quan-  
tities may need to be adjusted to bring the actual rise within  
allowable limits.  
IMPORTANT: After the Quick Test has been perfor-  
mend for stage 2, remove the jumper betwen HR1-NO  
and HR2-NO.  
Check Supply Fan Rotation — If unit is equipped  
with an optional VFD, check for correct fan rotation. Fan  
direction can be changed by disconnecting power and switch-  
ing 2 power leads downstream of the VFD output terminals  
T1, T2, and T3.  
7. Verify that control time periods programmed meet cur-  
rent requirements.  
8. Check all electrical connections to be sure they are tight.  
38  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Economizer operation is permitted if the system is not in  
Heating mode, if outdoor air enthalpy (via switch or humid-  
ity differential) is acceptable, and if outside air temperature  
is less than space temperature.  
If economizer operation is permitted, the ecomizer con-  
trol loop checks for Cooling System operation. If ON, the  
outside air dampers will be driven to maximum position.  
If cooling is not on , for VAV units, the economizer will  
modulate to satisfy the supply air set point.  
If cooling is not on, for CV units, the economizer will  
modulate to satisfy the space temperature set point.  
If Economizer operation is not permitted, the outside air  
dampers will be driven to minimum position (during Occu-  
pied period) or closed (during Unoccupied period).  
For VAV units, Economizer operation is not permitted when  
Occupied Heating is enabled and the Return Air Tempera-  
ture is LESS THAN (OHSP + 1).  
General  
NOTE: If unit is equipped with REMOTE START function,  
place the LOCAL/REMOTE switch in the LOCAL (Off)  
position.  
1. Put the ON/OFF switch in the ON position. Close the con-  
trol circuit breaker (CCB), which will energize the con-  
trol circuit and the crankcase heaters.  
2. Using the HSIO or Building Supervisor, verify that no  
alarms have been detected.  
3. Ensure that quick test has been performed to make sure  
that the controls are operating properly. Refer to the Con-  
trols and Troubleshooting Guide for more information.  
4. Using the HSIO, put the unit into Run mode.  
a. Press  
b. Press  
.
.
CLEAR  
c. Press  
. This will put the unit in Run mode.  
COOLING (All Units) — The controls try to control the supply-  
air temperature (SAT) to a system-calculated coil reference  
temperature value by cycling the compressors and the  
unloader(s). Both the supply- and return-air temperature sen-  
sors are used to adjust the cycling deadband to match the  
actual load. The control system provides cooling capacity  
control of up to 11 stages to maintain supply-air temperature  
(VAV) or space temperature (CV) to an occupied or un-  
occupied set point. Automatic lead-lag circuit switching  
occurs (if configured) to equalize run times per compressor  
for improved compressor reliability. The compressor to start  
first is changed every time stage equals zero.  
d. Press  
. The unit will change from mode 25  
(standby), to mode 32 (occupied) or mode 27 (unoc-  
cupied) depending on the programmed time  
schedule.  
Operating Sequences — Base unit operating  
sequences are presented below. Refer to unit Controls and  
Troubleshooting literature for expanded details on unit con-  
trols operation, additional controls functions, and logic theory.  
SUPPLY FAN  
VAV Units — During Occupied periods, the control will en-  
ergize the supply fan contactor. The contactor will close,  
energizing supply fan motor. Fan wheel will turn. Airflow  
Switch (differential pressure switch) contacts close, provid-  
ing discrete input (DI) to Channel 12 (Closed = Fan ON).  
Fan operation will continue through the Occupied period.  
During Unoccupied period with demand, the control will  
energize fan contactor when demand is sensed. After fan sta-  
tus is confirmed, operating routines will start. When demand  
is removed, routines will end and fan will shut off.  
NOTE: Automatic lead/lag should be disabled if optional hot  
gas bypass is employed because the unit only contains hot  
gas bypass on one circuit.  
The VAV control system sequence uses the modified supply-  
air set point (MSAT = supply-air set point ϩ reset value) as  
the supply-air temperature required to satisfy conditions (sub-  
master reference value [CSSR]) and outputs this value to the  
submaster loop.  
The submaster loop uses the modified supply-air set point  
compared to the actual supply-air temperature to determine  
the required number of capacity stages to satisfy the load.  
The logic for determining when to add or subtract a stage is  
a time-based integration of the deviation from the set point  
plus the rate of change of the supply-air temperature.  
The CV control system sequence reads the space sensor  
and performs a calculation to determine the supply-air tem-  
perature required (a cooling coil submaster reference [CCSR]  
value) to satisfy conditions and outputs this value to the sub-  
master loop.  
CV Units, Continuous Fan — During Occupied periods, the  
control will energize the supply fan contactor. The contactor  
will close, energizing supply fan motor. Fan wheel will turn.  
Airflow Switch (differential pressure switch) contacts close,  
providing discrete input (DI) to Channel 12 (Closed =  
Fan ON). Fan operation will continue through the Occupied  
period.  
During Unoccupied period with demand, the control will  
energize fan contactor when demand is sensed. After fan sta-  
tus is confirmed, operating routines will start. When demand  
is removed, routines will end and fan will shut off.  
OCCUPIED COOLING  
General — Economizer cycle must not be usable or damper  
position must be open to 90% or higher.  
VAV Units — Supply fan must be ON for cooling control to  
operate. Sequence is as follows:  
CV Units, Automatic Fan — Fan will be turned OFF during  
Occupied period when there is no demand for heating or cool-  
ing operation. When demand is sensed, control will energize  
fan contactor and initiate cooling cycle. Fan status will be  
confirmed. When demand is removed, routines will termi-  
nate and fan will be shut off.  
1. Unit must not be in Heating mode.  
2. Master Loop will survey occupancy status, Supply Air  
Set Point (SASP) and any Supply Air Temperature Reset  
command, then issue Cooling Coil Submaster Reference  
(CCSR) to Cooling Submaster Loop (CSL).  
3. The CSL surveys actual SAT, then calculates number of  
capacity stages required to produce the CCSR leaving the  
unit.  
4. Stages of cooling capacity are initiated. From zero stages,  
there will be a 1.5 to 3 minute delay before the first stage  
is initiated. The time delay between stages in increasing  
demand is 90 seconds.  
ECONOMIZER — The economizer control loop will be de-  
layed 2 minutes after the supply fan is turned ON, to allow  
system and temperatures to stabilize before starting control.  
When coming out of STANDBY or Heating mode, a 4-minute  
delay will occur before the economizer damper is con-  
trolled. During this delay, damper position is limited to CLOSED  
or MINIMUM position (depending on current unit occu-  
pancy status).  
If fan status is OFF, the outside air dampers will remain  
closed (return air dampers will be open). If fan status is ON,  
the outside air dampers will normally be at minimum damper  
position.  
39  
Download from Www.Somanuals.com. All Manuals Search And Download.  
5. As actual SAT approaches CCSR value, stages are re-  
leased. The minimum time delay between stages on de-  
creasing demand is 90 seconds.  
set point is user configurable. Like adaptive optimal start,  
the control corrects itself for optimal operation by adjusting  
the ‘‘K’’ factor as required.  
NOTE: Demand for heating has priority and Master Loop  
will either terminate existing or prevent initiation of  
Cooling Cycle by issuing a CCSR at the maximum limit.  
This will cause the CSL to select zero stages of cooling  
capacity, initiating a stoppage of an existing cooling cycle.  
GAS HEATING, OPERATION (48MP Units Only) — Re-  
fer to the Controls, Operation and Troubleshooting instruc-  
tions for information on the control logic used by the unit  
controls for gas heat operation.  
The 48MPD units have 2 gas heat sections. The 48MPE  
units have 3 gas heat sections. Each individual section op-  
erates in the same manner.  
CV Units — Supply fan must be ON for cooling control to  
operate. Sequence is as follows:  
1. Master Loop will survey space temperature and space tem-  
perature offset inputs, then calculate CCSR value.  
2. The CSL surveys actual SAT, then calculates number of  
capacity stages required to satisfy space load.  
3. Stages of cooling capacity are initiated. (From zero stages,  
there will be a 1.5 to 3 minute delay before first stage is  
initiated.)  
NOTE: The 48MP units have 2 stages of heat.  
When the PIC control calls for heating, power is sent to  
W on each IGC (integrated gas controller) board. An LED  
(light-emitting diode) on the IGC board will be on during  
normal operation. A check is made to ensure that the rollout  
switch and the limit switch are closed and the induced-draft  
motor is not running. The induced-draft motor is then en-  
ergized, and when speed is proven with the hall effect sensor  
on the motor, the ignition activation period begins. The burn-  
ers will ignite within 5 seconds.  
If the burners do not light, there is a 22-second delay be-  
fore another 5-second attempt. If the burners still do not light,  
this sequence is repeated for 15 minutes. After the 15 min-  
utes have elapsed, if the burners have not been lit, heating is  
locked out. To reset the control, use the manual reset method  
found in the Controls Operation and Troubleshooting book.  
When ignition occurs the IGC board will continue to moni-  
tor the condition of the rollout and limit switches, the hall  
effect sensor, and the flame sensor.  
When additional heat is required, W2 closes and initiates  
power to the second stage of the main gas valve. When the  
thermostat is satisfied, W1 and W2 open and the gas valve  
closes, interrupitng the flow of gas to the main burners. If  
the call for W1 lasted less than 1 minute, the heating cycle  
will not terminate until 1 minute after W1 became active.  
UNOCCUPIED COOLING — The unoccupied cooling  
sequence of operation is similar to Occupied Cooling (see  
above) except for the following:  
1. Supply Fan will be OFF as demand is initiated.  
2. The Master Loop will start Supply Fan and cooling cycle.  
Fan status must be proved as ON within 2 minutes to con-  
tinue with cooling operation.  
3. Control set point will be Unoccupied Cooling Set Point  
(UCSP).  
4. At end of cooling cycle, Supply Fan will be turned OFF.  
OVERRIDES  
First Stage and Slow Change Override — The first stage over-  
ride reduces cycling on the first stage of capacity, and the  
slow change override prevents the addition or subtraction of  
another stage of capacity if the SAT is close to the set point  
and gradually moving towards the set point.  
An LED indicator is provided on the IGC to monitor op-  
eration. The IGC is located by removing the side panel and  
viewing the IGC through the view port located in the control  
box access panel. During normal operation, the LED is con-  
tinuously on. See Table 26 for error codes.  
Low Temperature Override —This override function pro-  
tects against rapid load decreases by removing a stage every  
30 seconds when required based on temperature and the tem-  
perature rate of change.  
High Temperature Override — This override function pro-  
tects against rapid load increases by adding a stage once  
every 60 seconds as required, based on temperature and tem-  
perature rate of change.  
Table 26 — IGC Control Board LED Alarms  
INDICATION  
ON  
ERROR MODE  
Normal Operation  
ADAPTIVE OPTIMAL START — Optimal start is used  
to heat up or cool down the space prior to occupancy. The  
purpose is to have the space temperature approach and then  
achieve the occupied set point by the time of occupancy. The  
control utilizes outdoor-air temperature, space temperature,  
occupied set point, and a ‘‘K’’ factor. The ‘‘K’’ factor is ex-  
pressed in minutes per degree, and calculates a start time  
offset, which is the time in minutes that the system shall be  
started in advance of the occupied time. The control moni-  
tors its results and adjusts the ‘‘K’’ factor to ensure that the  
occupied set point is achieved at time of occupancy rather  
than too early or too late.  
OFF  
Hardware Failure  
1 FLASH  
Fan ON/OFF Delay Modified  
Limit Switch Fault  
2 FLASHES  
3 FLASHES  
4 FLASHES  
5 FLASHES  
6 FLASHES  
7 FLASHES  
8 FLASHES  
Flame Sense Fault  
4 Consecutive Limit Switch Faults  
Ignition Lockout Fault  
Induced Draft Motor Fault  
Rollout Switch Fault  
Internal Control Fault  
LEGEND  
Integrated Gas Unit Controller  
Light-Emitting diode  
ADAPTIVE OPTIMAL STOP (CV Applications Only) —  
Optimal stop is used to allow space temperature to drift to  
an expanded occupied set point during the last portion of an  
occupied period. The control calculates a stop time offset,  
(the time in minutes prior to the scheduled unoccupied time)  
during which expanded heating and cooling set points can  
be used. Adaptive optimal stop utilizes space temperature,  
an expanded occupied set point, and a ‘‘K’’ factor to calcu-  
late stop time offset. The amount (F) to expand the occupied  
IGC  
LED  
—
—
NOTES:  
1. There is a 3-second pause between error code displays.  
2. If more than one error code exists, all applicable error codes will  
be displayed in numerical sequence.  
3. Error codes on the IGC will be lost if power to the unit is  
interrupted.  
40  
Download from Www.Somanuals.com. All Manuals Search And Download.  
5. Verify/adjust the SMG. If the SMG is too large, the loop  
will tend to oscillate (hunt). If it is too small, the loop  
will react too slowly.  
Control Loop Checkout  
Verify or adjust the SMG as follows:  
Using the HSIO keypad, force the submaster reference  
of the control loop to a value above or below the actual  
sensor reading. Verify that the actuator responds cor-  
rectly. If the actuator drives in the wrong direction, go  
to the submaster gain (SMG) for the control loop and  
reverse the sign of the gain.  
The checkout and adjustment of control loops should  
only be done by certified Carrier Comfort Network  
(CCN) technicians. The following checkout procedure  
is offered as a guide and presumes the user has obtained  
basic knowledge of controls through CCN training.  
For example: If the submaster loop gain is 5.0, change  
it to -5.0.  
TO CHECK OPERATION OF ANALOG OUTPUTS — The  
control algorithms of the unit controls utilize the master/  
submaster loop concept. The master loop monitors the  
master sensor (the sensor which tries to maintain the desired  
set point), and calculates the submaster reference required to  
do so. The submaster loop monitors the submaster sensor  
and controls the actual output to the controlled device.  
These algorithms require the adjustment of a number of  
gain values to function properly. The 48/50MP units come  
with preset default values. However, it may be necessary to  
adjust several of these values to achieve stable control. These  
values are submaster loop gain (SMG), submaster loop cen-  
ter value (SCV), and master loop gain (MLG). In addition,  
proportional, integral, and derivative multiplier values can  
be accessed through the Building Supervisor, Service Tool,  
or ComfortWorks™ software.  
6. Observe the operation of the controlled device for a few  
minutes. If the device oscillates every few seconds around  
the forced value, then lower the SMG by small amounts  
until the output steadies. If the output to the device re-  
sponds to a change in the temperature in small incre-  
ments, then increase the SMG in small amounts until  
the output steadies.  
NOTE: Do not be alarmed if the submaster sensor sta-  
bilizes at a value greater or less than the forced value.  
This is called the submaster droop offset and is normal.  
7. It is not necessary to adjust the submaster loop center  
value, as the master loop will adjust the submaster ref-  
erence as required to satisfy its set point. However, it  
may be desirable to keep the submaster droop to a mini-  
mum. This is most often required for economizer loops.  
To verify or adjust submaster default values, perform the  
following for each controlled device (control loop):  
If the submaster droop is too large, adjust the SCV as  
follows:  
If the submaster droop is positive (actual value greater  
than reference value), the SCV should be decreased for  
HCV (heating coil) and IGV (supply fan VFD) loops  
and increased for CC (cooling control) and ECON (econo-  
mizer) loops.  
1. Verify that the system is in the Occupied mode and the  
supply-air fan is running.  
2. Verify that the supply-air fan status indicates ON. If the  
fan status is OFF, the unit control algorithms will dis-  
able all routines.  
3. Verify that all forced values have been removed.  
4. Table 27 indicates recommended starting values for MLG  
and SMG for 48/50MP units. Verify that these values  
have been entered by checking the service function.  
If the submaster droop is negative (actual value less than  
reference value), the SCV should be increased for HCV  
and IGV loops and decreased for CC and ECON loops.  
Table 27 — 48/50MP Units SMG, SCV and MLG Recommended Starting Values  
SERVICE  
SUBFUNCTION  
(HSIO)  
GAIN VALUE  
FUNCTION/GAIN OR SCV  
CV Application  
VAV Application  
Cooling Control  
MLG  
8
1.0  
1.0  
Economizer  
MLG  
10  
10  
10  
1.0  
−7.5  
50  
1.0  
−7.5  
50  
SMG  
SCV  
Duct Pressure (VFD)  
MLG  
SMG  
SCV  
9
9
9
N/A  
N/A  
N/A  
1.0  
2.0*  
35*  
Building Pressure  
MLG  
SMG  
SCV  
18  
18  
18  
1.0  
−5.0  
50  
1.0  
−5.0  
50  
Staged Heat  
MLG †  
SMG †  
11  
11  
1.0  
5.0  
1.0  
5.0  
Heating Coil  
MLG  
7
7
7
1.0  
7.5  
50  
1.0  
7.5  
50  
SMG  
SCV  
Humidifier  
MLG  
17  
17  
17  
1.0  
7.5  
50  
1.0  
7.5  
50  
SMG  
SCV  
*Factory setting; differs from new control setting.  
†48MP only.  
LEGEND  
CV  
—
—
—
—
—
Constant Volume  
MLG  
SCV  
SMG  
VAV  
Master Loop Gain  
Submaster Center Value  
Submaster Loop Gain  
Variable Air Volume  
41  
Download from Www.Somanuals.com. All Manuals Search And Download.  
8. Once the submaster loop is adjusted, remove all forced  
values and proceed with verification and adjustment of  
master loop.  
CONTROL SYSTEM  
General — The control system consists of the following  
components:  
9. To check the master loop:  
• standard processor module (PSIO 8088 or PSIO1)  
• options processor module (PSIO 8052 or PSIO2)  
• two standard high-voltage relay modules (DSIO-HV or  
DSIO1 and DSIO2)  
• keypad and display module (HSIO or LID)  
• enthalpy sensor  
Create a demand in the master loop. For example: Force  
the actual space temperature to a value less than the heat-  
ing set point or greater than the cooling set point.  
10. Observe system (loop) response for 10 to 20 minutes to  
verify stable control. After 10 minutes, if the output con-  
tinues to swing from full open to full closed, lower the  
MLG and observe again.  
11. Do this until the loop operation is stable. After 10 min-  
utes, if the loop does not seem to respond (little change  
in submaster reference), increase the MLG and observe  
again. Do this until stable operation is achieved.  
• thermistors  
• pressure transducers  
• accessory humidity sensors  
• space temperature sensors (standard T55 and accessory T56)  
• supply-air fan status switch  
• check filter switch  
12. Once satisfied with loop operation, remove all forced  
values which may have been initiated during this  
procedure.  
Components  
PROCESSOR MODULE NO. 1 — The PSIO1 module moni-  
tors and processes the following inputs, outputs, and system  
information:  
13. Repeat Steps 1-12 until all loops have been checked.  
NOTE: For better tuning, the building supervisor or service  
tool should be used to adjust the proportional and integral  
terms. Contact your Carrier representative for more details.  
Inputs:  
• transducers  
• thermistors  
• switches  
Outputs:  
• condenser-fan contactors  
• integrated economizer motor (4 to 20 mA)  
• optional supply duct static pressure control (VFD) (4 to  
20 mA)  
• optional modulating power exhaust control (VFD)  
(4 to 20 mA)  
IAQ Control Loop Adjustment — The IAQ (indoor  
air quality) control loop is different from the other control  
loops. It has one gain value that can be adjusted in the serv-  
ice subfunction (  
) under IAQG (indoor-air quality  
gain). This gain is used to speed up or slow down the  
response of the economizer dampers to the difference be-  
tween the IAQ set point and the IAQ sensor. If the econo-  
mizer is moving too slowly, then the gain needs to be  
increased. If the economizer moves too rapidly and over-  
shoots the set point, then the gain should be reduced.  
System Information:  
• generates alert and alarm information (via transducer, ther-  
mistor, and sensor inputs)  
• supports CCN level II communications  
• supports digital air volume (DAV) interface  
NOTE: The correct module address for the PSIO1 is 01 (S1  
set at 0; S2 set at 1).  
PROCESSOR MODULE NO. 2 — The PSIO2 module sup-  
ports the sensors used for:  
Lead/Lag Circuits — Lead/lag circuits and compres-  
sors are shown in Table 20.  
• humidity control  
• outdoor-air cfm  
• indoor-air quality (IAQ)  
• smoke control  
Table 29 — Index of Lead/Lag Circuits and  
Compressors  
• superheat monitoring (only when accessory transducer ther-  
mistor kit is field-installed).  
In addition, the PSIO2 supplies the outputs for humidity  
and hydronic heating coil control and a discrete output with  
timed clock control (for outdoor building or parking lot lights).  
UNIT 48/50MP  
62L  
70M  
82N, 90P, 10R  
LEAD CIRCUIT  
Compressor, Lead  
Compressor, Lag  
A
A1  
*
A
A1  
A2  
A
A1  
A2  
LAG CIRCUIT  
Compressor, Lead  
Compressor, Lag  
B
B1  
*
B
B1  
*
B
B1  
B2  
NOTE: The correct module address for the PSIO2 is 31 (S1  
set at 3; S2 set at 1).  
*Circuit only has 1 compressor.  
HIGH-VOLTAGE RELAY MODULES (DSIO) — The DSIO  
modules close contacts to energize evaporator and con-  
denser fan contactors. The modules also control compressor  
unloaders, compressor contactors, compressor crankcase heat-  
ers, heat interlock function, and power exhaust contactor.  
The compressor status through the compressor lockout (CLO)  
relays and high-pressure switches (safety circuits) are the in-  
puts to these modules.  
Final Checks — Ensure all safety controls are opera-  
ting, control panel covers are on, and the service panels are  
in place.  
Recheck all set points against project specifications. Com-  
plete Start-Up Checklist and record operating values. Leave  
completed checklist with unit for future reference.  
NOTE: The correct module addresses for the DSIO1 and DSIO2  
modules are 19 and 49, respectively. Set the switch closest  
to the mounting plate at 1 (DSIO1) or 4 (DSIO2), and the  
other switch at 9 (both modules).  
NOTE: If the REMOTE START function is used in this ap-  
plication, set the LOCAL/REMOTE switch to REMOTE (On)  
at the end of start-up.  
42  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Motor Protection — Manual reset, calibrated trip, mag-  
netic circuit breakers are provided for each compressor, sup-  
ply fan motor, and optional exhaust fan motor.  
Outdoor fan motor circuits are also protected by circuit  
breakers.  
KEYPAD AND DISPLAY MODULE (HSIO)  
IMPORTANT: The HSIO (human sensor input/output)  
keypad and display module is required for initial start-up  
of these units. All units are shipped in standby mode,  
and the HSIO must be used to change the unit to run  
mode. Once the unit is in run mode, the HSIO is not  
required for normal operation.  
Refer to the Service section more information on serv-  
icing motors.  
Variable Frequency Drive (VFD) — An optional VFD  
can be factory-installed and is used to modulate supply fan  
airflow to maintain duct static pressure on VAV applications.  
The keypad and display module HSIO (or local interface  
device, LID, factory-installed and located in the main  
control box) provides unit function information at the unit.  
The module consists of a keypad with 6 function keys,  
5 operative keys, 10 numeric keys (0 through 9), and an  
alphanumeric 8-character liquid crystal display (LCD). Key  
usage is explained in Table 23. Each function has one or more  
subfunctions as shown in Table 29.  
A second VFD can be used to modulate exhaust fan airflow  
to maintain building pressure on units equipped with modu-  
lating power exhaust option.  
The supply fan VFD is located in the auxiliary control  
compartment, on the left hand side of the unit, at the end of  
the supply fan section.  
The HSIO keypad and display module is installed through  
connection of the power and communication plugs and can  
be easily moved from one unit to another. Because of this  
flexibility, one HSIO can be used for several units.  
Unit operation is controlled by the status of the RUN/  
STANDBY mode on the HSIO. To access the mode, press  
The modulating power exhaust VFD is located in the ex-  
haust fan compartment, on the right hand side of the unit, at  
the return air end.  
Control input to the supply fan VFD is provided by a 4 to  
20 mA signal from the PSIO1 (Channel 16).  
Control input to the exhaust fan VFD is provided by a  
4 to 20 mA signal from the PSIO1 (Channel 15).  
on the HSIO keypad, and then use the  
Set point control for the VFD is done through the HSIO  
key. The HSIO will display either STBY YES or STBY NO.  
or other network devices (subfunction  
). Refer to the  
CLEAR  
ENTER  
To enable the unit, press  
or  
and press  
while  
Controls and Troubleshooting manual for configuration in-  
structions and sequence of operation.  
The VFD has been programmed at the factory for 48/  
50MP applications. No further adjustments should be nec-  
essary at start-up.  
at the STBY YES display. To disable the unit, press  
ENTER  
while at the STBY NO display. Clearing an alarm  
that has stopped unit operation is accomplished by entering  
the  
STBY  
YES  
mode.  
A separate technical and service manual for the factory  
installed VFD is supplied with each unit. Refer to the VFD  
manual for more information on accessing and diagnosing  
the VFD controls.  
IMPORTANT: Use the STBY YES mode when ser-  
vicing the unit or running the Quick Test feature.  
DISPLAY AND KEYPAD — All functions of the VFD are  
accessed using the Digital Operator. See Fig. 49. The Digital  
Operator has a 4-digit LED display. By pressing the  
IMPORTANT: If unit is also equipped with REMOTE  
START function, place LOCAL/REMOTE switch in  
LOCAL (Off) position when servicing or running Quick  
Test feature.  
DSPL key on the Digital Operator while the drive is stopped,  
the user can step to each of the 16 functions and displays.  
See Table 30.  
Default Set Points/Changing Set Points — Re-  
fer to Table 24 for factory default configuration and set point  
values.  
Record any changes made during start-up and leave with  
unit for future reference.  
These values may be changed from the HSIO keypad at  
any time. If changing values via Service Tool or CCN Build-  
ing Supervisor, the unit must be in RUN mode (STBY NO),  
which is done through HSIO input or a Remote Start input.  
After changing the values in subfunction  
Reset function must be enabled.  
, the Data  
43  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Table 29 — HSIO Keypad and Display Module Functions and Subfunctions  
FUNCTIONS  
SUB  
FUNCTION  
NO.  
Status  
History  
Schedule  
Service  
Set Point  
Test  
Occupied  
Mode  
Override  
(Unit)  
Current  
Alarms  
Log on and  
Log off  
System  
Set Point  
Test of  
Inputs  
1
Alarms  
Current  
Alerts  
Period 1  
(Unit)  
Software  
Version  
Demand  
Limit  
Analog  
2
3
Maintenance  
—
Outputs  
Current  
Operating  
Modes  
Period 2  
(Unit)  
Factory  
Configuration  
Current  
Time  
Discrete  
Outputs  
Daylight  
Savings  
Time  
Capacity  
Stages  
Period 3  
(Unit)  
Test  
4
5
—
—
Bus Address  
Compressors  
Current  
Operating  
Set Points  
Period 4  
(Unit)  
Units  
of Measure  
Configure  
Holiday  
Test Heat  
System  
Period 5  
(Unit)  
User  
6
7
8
9
—
—
—
—
—
—
—
—
Exit Test  
Temperatures  
Configuration  
System  
Pressures  
Period 6  
(Unit)  
Heating Coil  
Cooling  
—
—
—
Period 7  
(Unit)  
Inputs  
Analog  
Outputs  
Period 8  
(Unit)  
Duct Pressure  
Occupied  
Mode  
Override  
(TDO)  
Discrete  
Outputs  
10  
—
Economizer  
—
—
Run/  
Period 1  
(TDO)  
11  
12  
—
—
Heat  
—
—
—
—
Standby  
Period 2  
(TDO)  
Nighttime  
Free Cool  
—
—
Adaptive  
Optimal  
Start/Stop  
Period 3  
(TDO)  
13  
—
—
—
Period 4  
(TDO)  
Temperature  
Reset  
14  
15  
16  
17  
18  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Period 5  
(TDO)  
Configure  
Loadshed  
Period 6  
(TDO)  
Configure IAQ  
Period 7  
(TDO)  
Configure  
Humidity  
Period 8  
(TDO)  
Building  
Pressure  
19  
20  
—
—
—
—
—
—
Alert Limits  
—
—
—
—
Service History  
Service  
Maintenance  
Alarm  
21  
22  
—
—
—
—
—
—
—
—
—
—
Override History  
LEGEND  
Indoor-Air Quality  
Timed Discrete Output  
IAQ  
TDO  
—
—
44  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Table 30 — Variable Frequency Drive (VFD) Display  
SERVICE  
DISPLAY  
Fref  
ACTION  
Service Access — All unit components can be reached  
through clearly labeled hinged access doors. These doors are  
equipped with tiebacks, but if heavy duty servicing is needed,  
it is recommended that the doors be removed or propped open.  
Not used.  
Displays the output frequency at which the VFD is cur-  
rently operating. This is a display only function. The user  
cannot change this displayed value.  
Fout  
lout  
Each door is held closed with 3 latches. The latches are  
Displays the level of output current that the VFD is cur-  
rently producing. This is a display only function. The user  
cannot change this displayed value.  
1
1
secured to the unit with a single ⁄4-in. Ϫ20 x ⁄2-in. long  
bolt. See Fig. 50.  
Displays the output power that the VFD is currently pro-  
ducing. This is a display only function. The user cannot  
change this displayed value.  
To open, loosen the latch bolt using a 7/16-in. wrench.  
Pivot the latch so it is not in contact with the door. Open the  
door. To shut, reverse the above procedure.  
kWout  
F/R  
Sets the rotation direction of the motor when a run com-  
mand is given.  
NOTE: Disassembly of the top cover may be required under  
special service circumstances. It is very important that the  
orientation and position of the top cover be marked on the  
unit prior to disassembly. This will allow proper replace-  
ment of the top cover onto the unit and prevent rainwater  
from leaking into the unit.  
ENTER  
Press  
to access the monitor parameters  
Montr  
(U-01 through U-13).  
Not used.  
Accel  
Decel  
Vmtr  
Not used.  
Sets the rated voltage of the motor.  
Sets a preset V/f pattern or allows a custom V/f pattern  
to be set.  
V/F  
IMPORTANT: After servicing is completed, make sure  
door is closed and relatched properly, and that the latches  
are tight. Failure to do this can result in water leakage  
into the indoor-air section of the unit.  
Sets the frequency reference gain for the analog fre-  
quency reference.  
Fgain  
Fbias  
FLA  
Sets the frequency reference bias for the analog fre-  
quency reference.  
Sets the full load amps used for detecting motor over-  
load. When FLA is set to 0 it is disabled.  
PID  
Enables or disables the PID.  
kWsav  
PRGM  
Enables or disables the energy saving function.  
Allows parameter programming.  
LEGEND  
PID  
—
Proportional Integral Derivative  
REMOTE Mode indication LEDs.  
The LEDs light when REMOTE  
Mode has been selected.  
REMOTE  
REF  
SEQ  
4-digit, 7-segment LED  
display; shows selected  
operation status, fault code,  
or parameter data.  
DISPLAY SECTION  
Fref  
F/R  
Fout  
Montr  
V / F  
PID  
lout  
kWout  
Accel Decel  
Fgain Fbias  
Function LEDs  
Vmtr  
FLA  
kWsav PGRM  
Switch between Function  
LEDs*  
DIGITAL OPERATOR  
JVOP-131  
KEYPAD SECTION  
Increase parameter  
number or displayed  
value.  
Displays data to be  
changed, and enters new  
data.*  
DSPL  
ENTER  
Switch between LOCAL  
and REMOTE operation  
modes.  
LOCAL  
REMOTE  
Decrease parameter number  
or displayed value.  
STOP  
RESET  
RUN  
Stop the motor, or reset a  
drive fault. LED lights when  
drive is in stopped condition.  
Run the motor. LED lights  
when drive is controlling  
motor speed.  
*Pressing DSPL and ENTER keys simultaneously allows all parameter  
data to be read, but not set, while the drive is running.  
Fig. 49 — VFD Digital Operator  
45  
Download from Www.Somanuals.com. All Manuals Search And Download.  
GAS HEAT SECTION — Access to the gas heat section is  
through the door labeled ‘‘HEAT SECTION’’ on the right  
hand side of the unit. All gas system components are in the  
gas section. On 48MP62L and 70M units, additional access  
to the gas components is through the access panels in the  
unit corner post at the gas section. See Fig. 51.  
UNIT CONTROL BOX —Access to this component is through  
the doors marked ELECTRICAL SECTION on the con-  
denser end of the unit.  
ECONOMIZER DAMPER MOTORS — The economizer  
motors are located in the return air section. Access to the  
motors is through the doors labelled FAN SECTION on the  
each side of the unit.  
Fig. 50 — Door Latch  
RETURN-AIR FILTERS — Access to these filters is through  
the door marked FILTER SECTION on the right side of the  
unit.  
UNIT CONTROL BOX — Viewed facing compressors, the  
control box is at the left end of the unit. Incoming power for  
controls, refrigerant system, and fan system enters through  
the control box. The control box contains power compo-  
nents and electronic controls. Outer panels are hinged and  
latched for easy opening. Remove screws to remove inner  
panels. Outer panels can be held open for service and in-  
spection by using a door retainer on each panel. Remove  
bottom pin from door retainer assembly, swing retainer out  
horizontally, and engage pin in one of the retainer ears in the  
hinge assembly.  
CONDENSER FANS AND FAN MOTORS — Remove the  
wire fan guard on top of the unit to gain access to the con-  
denser fans and motors.  
Cleaning — Inspect unit at the beginning of each heating  
and cooling season and during each season as operating con-  
ditions may require.  
Clean condenser coil with a vacuum cleaner, fresh water,  
compressed air, or a bristle brush (not wire). Coil cleaning  
should be a part of the planned maintenance program. Clean  
evaporator coil with a stiff bristle brush (not wire), vacuum  
cleaner, or compressed air.  
Check and clean condensate drain annually at the start of  
the cooling season.  
Replace return-air filters at the start of each heating and  
cooling season or as often as necessary during each season,  
depending on operating conditions. See Table 1 for filter types,  
quantities, and sizes.  
COMPRESSORS — The oil pump end (compressor access)  
of each compressor is readily accessible from sides of unit  
as shown in Fig. 51. Access the motor end of the compressor  
through the condenser end of the unit or by removing  
compressor.  
LIQUID SERVICE VALVES, SOLENOID VALVES, FIL-  
TER DRIERS, AND SIGHT GLASSES — These compo-  
nents are located in the inside corner of the condenser sec-  
tion on the right-hand side of the unit. Filter driers are  
replaceable-core type. See Fig. 51.  
1. Remove economizer outdoor-air filters from the hoods by  
removing the filter retainers.  
2. Clean filters with steam or hot water and mild detergent.  
3. Reinstall filters in hoods after cleaning. Never replace clean-  
able filters with throwaway filters.  
EVAPORATOR-FAN MOTORS, PULLEYS, AND BELTS  
— Access to these components is through the 2 doors  
labeled FAN SECTION on each side of the unit.  
POWER EXHAUST MOTORS, PULLEYS, AND BELTS  
— Access to these components is through the doors at the  
return air end of the unit.  
Fig. 51 — Access Locations (48MP70M Unit Shown)  
46  
Download from Www.Somanuals.com. All Manuals Search And Download.  
MAIN BURNERS (48MP Only) — At the beginning of each  
heating season, inspect for deterioration or blockage due to  
corrosion or other causes. Observe the main burner flames.  
Refer to Main Burners section on page 52.  
All units are shipped with a complete operating charge of  
R-22. See unit nameplate and Table 1 for amount of charge.  
When adding a complete charge, evacuate system using stand-  
ard evacuating procedures and weigh in the specified amount  
of charge. All units have charging charts for each refrigerant  
circuit. See Fig. 55-59.  
FLUE GAS PASSAGEWAYS (48MP Only) — The flue col-  
lector box and heat exchanger cells may be inspected by re-  
moving heat exchanger access panel (Fig. 3 and 4), flue box  
cover, and main burner assembly (Fig. 52). Refer to Main  
Burners section on page 52 for burner removal sequence. If  
cleaning is required, remove heat exchanger baffles and clean  
tubes with a wire brush.  
Use caution with ceramic heat exchanger baffles. When  
installing retaining clip, be sure the center leg of the clip  
extends inward toward baffle. See Fig. 53.  
COMBUSTION-AIR BLOWERS (48MP Only) — Clean pe-  
riodically to assure proper airflow and heating efficiency. In-  
spect blower wheel every fall and periodically during heat-  
ing season. For the first heating season, inspect blower wheel  
bi-monthly to determine proper cleaning frequency.  
To inspect blower wheel, remove heat exchanger access  
panel. Shine a flashlight into opening to inspect wheel. If  
cleaning is required, remove motor and wheel assembly by  
removing screws holding motor mounting plate to top of com-  
bustion fan housing (Fig. 54). The motor and wheel assem-  
bly will slide up and out of the fan housing. Remove the  
blower wheel from the motor shaft and clean with a deter-  
gent or solvent. Replace motor and wheel assembly.  
Lubrication  
Fig. 52 — Burner Section Detail  
COMPRESSORS — Each compressor is correctly charged  
at the factory. Refer to 06E Compressor Service Manuals if  
additional information regarding compressor lubrication sys-  
tem is required. See Compressor Oil section on page 29 and  
Table 3.  
CERAMIC  
BAFFLE  
CLIP  
FAN SHAFT BEARINGS — Lubricate fan shaft bearings at  
least once a year with suitable bearing grease. Extended grease  
lines are provided on pulley side of blower. Typical lubri-  
cants are given below:  
MANUFACTURER  
LUBRICANT  
Texaco  
Mobil  
Sunoco  
Texaco  
Regal AFB-2*  
Mobilplex EP No. 1  
Prestige 42  
Multifak 2  
*Preferred lubricant because it contains rust and oxidation inhibitors.  
HEAT EXCHANGER  
TUBES  
FAN MOTOR BEARINGS — The condenser- and evaporator-  
fan motors have sealed bearings so no field lubrication is  
required.  
NOTE: One baffle and clip wll be in each upper tube of the heat  
exchanger.  
Fig. 53 — Removing Heat Exchanger Ceramic  
Baffles and Clips  
DOOR HINGES — All door hinges should be lubricated at  
least once a year.  
Coil Cleaning — Clean the coils with a vacuum cleaner,  
compressed air, water, or a non-wire bristle brush.  
Refrigerant Circuit  
LEAK TESTING — Units are shipped with a full operating  
charge of R-22 (see Table 1). If there is no pressure in  
the system, introduce enough nitrogen to search for the leak.  
Repair the leak using good refrigeration practices. After leaks  
are repaired, system must be evacuated and dehydrated  
using methods described in GTAC II, Module 4, System  
Dehydration.  
REFRIGERANT CHARGE (Refer to Table 1) — At the liq-  
uid line connection point on each circuit is a factory-  
installed liquid line service valve. On each valve is a 1⁄4-in.  
Schrader connection for charging liquid refrigerant.  
Fig. 54 — Combustion Blower Removal  
47  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Fig. 55 — Charging Chart — Unit 48/50MP62L  
Fig. 56 — Charging Chart — Unit 48/50MP70M  
Fig. 57 — Chrging Chart — Unit 48/50MP82N  
48  
Download from Www.Somanuals.com. All Manuals Search And Download.  
150  
125  
100  
75  
ADD CHARGE IF ABOVE CURVE  
REMOVE CHARGE IF BELOW CURVE  
50  
100  
150  
200  
250  
300  
350  
400  
LIQUID PRESSURE AT LIQUID VALVE (PSIG)  
ALL OUTDOOR FANS MUST BE OPERATING  
Fig. 58 — Charging Chart Unit 48/50MP90P  
150  
125  
150  
130  
110  
90  
ADD CHARGE IF ABOVE CURVE  
REMOVE CHARGE IF BELOW CURVE  
ADD CHARGE IF ABOVE CURVE  
100  
75  
REMOVE CHARGE IF BELOW CURVE  
70  
50  
50  
300  
LIQUID PRESSURE AT LIQUID VALVE (PSIG)  
350  
400  
450  
150  
200  
100  
250  
100  
150  
200  
250  
300  
350  
400  
LIQUID PRESSURE AT LIQUID VALVE (PSIG)  
ALL OUTDOOR FANS MUST BE RUNNING  
Fig. 59 — Charging Chart — Unit 48/50MP10R  
Charging with Unit Off and Evacuated — Close liquid  
line service valve before charging. Weigh in charge shown  
in Table 1. Open liquid line service valve; start unit and  
allow it to run several minutes fully loaded. Check for a clear  
sight glass. Be sure clear condition is liquid and not vapor.  
Complete charging the unit.  
IMPORTANT: For units with 2 compressors per re-  
frigeration circuit, both compressors must be running  
to adjust the oil level. Two oil level equalizer lines be-  
tween compressors distribute the oil to each  
compressor.  
Charging with Unit Running — If charge is to be added while  
unit is operating, it is necessary to have all condenser fans  
and compressors operating. It may be necessary to block con-  
denser coils at low-ambient temperatures to raise condens-  
ing pressure to approximately 280 psig (1931 kPag) to turn  
all condenser fans on. Do not totally block a coil to do this.  
Partially block all coils in uniform pattern. Charge vapor into  
compressor low-side service port located above oil pump crank-  
shaft housing. Charge each circuit until sight glass shows  
clear liquid.  
REMOVE OIL — Pump down compressor to 2 psig  
(14 kPag). Loosen the 1⁄4-in. (6.4-mm) pipe plug at the com-  
pressor base and allow the oil to seep out past the threads of  
the plug.  
NOTE: The crankcase will be slightly pressurized. Do not  
remove the plug, or the entire oil charge will be lost.  
Small amounts of oil can be removed through the oil pump  
discharge connection while the compressor is running.  
Oil Charge (Refer to Table 3) — All units are fac-  
tory charged with oil. Acceptable oil level for each compres-  
sor is from 3⁄8 to 1⁄8 (on 06E299, 1⁄8 max) of sight glass (see  
Fig. 44, page 29).  
When additional oil or a complete charge is required, use  
only Carrier-approved compressor oil.  
Moisture/Liquid Indicator — A clear flow of liquid  
refrigerant indicates sufficient charge in the system. Bubbles  
indicate undercharged system or the presence of non-  
condensables. Moisture in the system measured in parts per  
million (ppm) changes the color of the indicator:  
Green  
Chartreuse — 45 to 130 ppm (caution!)  
Yellow — moisture above 130 ppm (wet)  
— moisture below 45 ppm (dry)  
Approved oils are:  
Petroleum Specialties, Inc. — Cryol 150A (factory oil charge)  
Change filter driers at the first sign of moisture in the sys-  
tem. See Carrier Charging Handbook for more information.  
Texaco, Inc.  
Witco Chemical Co.  
— Capella WF-32-150  
— Suniso 3GS  
Do not reuse drained oil, and do not use any oil that has  
been exposed to atmosphere.  
IMPORTANT: Unit must be in operation at least  
12 hours before moisture indicator can give an accu-  
rate reading. With unit running, indicating element must  
be in contact with liquid refrigerant to give a true  
reading.  
ADD OIL — Close suction shutoff valve and pump down  
crankcase to 2 psig (14 kPa). (Low-pressure cutout must be  
jumped.) Wait a few minutes and repeat until pressure re-  
mains steady at 2 psig (14 kPa). Remove oil fill plug above  
the oil level sight glass, add oil through plug hole, and re-  
place plug. Run compressor for 20 minutes and check oil  
level.  
Filter Driers — The 48/50MP units use replaceable core  
type filter driers, one in each refrigeration circuit. The filter  
driers are located in the condenser sections, accessible from  
the right side of the unit.  
49  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Replace the filter cores whenever the moisture/liquid in-  
dicator shows moisture in the system.  
Follow instructions on the packaging for the replacement  
cores for disassembling and reassembling the filter assem-  
blies and housings.  
Pressure Relief — High-side pressure relief is  
provided by a fusible plug in the liquid line at the serv-  
ice valve. For low-side pressure relief, a fusible plug is  
inserted in the side of the accumulator. See Fig. 60. A pres-  
sure relief valve installed on the compressor relieves at  
450 psig (3102 kPag).  
Liquid Line Service Valve — Located immediately  
ahead of the filter drier, this valve has a 1⁄4-in. flare connec-  
tion for field charging. With the liquid circuit shut, the com-  
pressor can be used to pump the refrigerant down into the  
high side. The refrigerant can then be stored there by closing  
the compressor discharge valve.  
Adjustments  
EVAPORATOR FAN AND POWER EXHAUST MOTOR  
PLATE — Adjust using a 15⁄16-in. wrench on the adjusting  
bolts:  
1. Loosen holddown bolts. (See Fig. 61.)  
Compressor Suction and Discharge Service  
2. Turn the adjusting bolts to move the motor mounting plate  
toward or away from the fan to loosen or tighten the belts.  
Make the same number of turns to each bolt.  
3. Retighten holddown bolts.  
BELT INSTALLATION AND TENSIONING  
Valves — Each compressor is provided with suction and  
discharge service valves. With these valves, the compressor  
can be isolated from the refrigerant system for servicing or  
replacing.  
High-Pressure Switch — This switch has nonadjust-  
able settings. Figure 60 shows connection on a cylinder head.  
See Table 31 for pressure switch settings.  
IMPORTANT: When installing or replacing belts, al-  
ways use a complete set of new, matched belts to pre-  
vent potential vibration problems. Mixing belts often  
results in premature breakage of the new belts.  
Table 31 — Pressure Switch Settings,  
Psig (kPag)  
1. Turn off unit power.  
SWITCH  
High  
CUTOUT  
CUT-IN  
2. Adjust motor plate so belts can be installed without stretch-  
ing over the grooves of the pulley. (Forcing the belts can  
result in uneven belt stretching and a mismatched set of  
belts.)  
426 ± 7  
(2935 ± 48)  
320 ± 20  
(2205 ± 138)  
27 ± 4  
(186 ± 28)  
67 ± 7  
(462 ± 48)  
Low  
3. Before tensioning the belts, equalize belt slack so that it  
is on the same side of the belt for all belts. Failure to do  
so may result in uneven belt stretching.  
NOTE: High-pressure switch must be removed from cylin-  
der head before removing compressor from the unit.  
4. Tighten belts using the motor plate adjusting bolts.  
TO CHECK — Slowly close the discharge shutoff valve  
until the compressor shuts down. This should be at approx-  
imately 426 psig (2935 kPag). Slowly open the valve. When  
the pressure drops to approximately 320 psig (2205 kPag),  
the pressure switch resets. To reenergize the control circuit,  
manually switch the fan circuit breaker off and then on. The  
compressor starts again under Time Guard௡ controls.  
5. Adjust until proper belt tension (1/2-in. deflection with  
one finger) is obtained. Be sure to adjust both adjusting  
bolts the same number of turns.  
NOTE: Check the tension at least twice during the first  
day of operation, as there is normally a rapid decrease in  
tension until the belts have run in. Check tension  
periodically thereafter and keep it at the recommended  
tension.  
Low-Pressure Switch — The low-pressure switch (LPS)  
has fixed nonadjustable settings. It is located at the pump  
end of the compressor above the bearing head. See Table 31  
for pressure switch settings.  
With the correct belt tension, belts may slip and squeal  
momentarily on start-up. This slippage is normal and dis-  
appears after wheel reaches operating speed. Excessive belt  
tension shortens belt life and may cause bearing and shaft  
damage.  
TO CHECK — Slowly close the suction cut-off valve and  
allow the compressor to shut down. This should occur at  
approximately 27 psig (186 kPag). Slowly open the valve.  
The compressor restarts under Time Guard control when the  
pressure builds to approximately 67 psig (462 kPag).  
50  
Download from Www.Somanuals.com. All Manuals Search And Download.  
HIGH-  
PRESSURE  
SWITCH  
CYLINDER  
HEADS  
MUFFLER  
SIGHT  
GLASS  
OIL  
EQUALIZER  
LINE  
LOW-  
RAIL  
CRANKCASE  
HEATER  
SIGHT  
GLASS  
MOUNTING  
SPRING  
(HIDDEN)  
PRESSURE RELIEF  
VALVE  
PRESSURE  
SWITCH  
NOTE: Units 48/50MP62L compressors are pan mounted. Units 48/50MP70M and 82N  
compressors are mounted on rails.  
Fig. 60 — 06E Compressors, Typical  
Fig. 61 — Motor Plate Adjustment  
51  
Download from Www.Somanuals.com. All Manuals Search And Download.  
PULLEY ALIGNMENT — For proper belt life, the motor  
and fan pulleys must be properly aligned. To check, first turn  
off unit power. Place a straightedge against the motor and  
fan pulleys. See Fig. 62. If the pulleys are properly aligned,  
the straightedge should be parallel to the belts.  
If they are not parallel, check that the motor shaft and fan  
shaft are parallel. If they are not, adjust the motor plate  
adjusting bolts until they are.  
6. Remove screw cap covering regulator adjustment screw  
(see Fig. 63).  
7. Turn adjustment screw clockwise to increase pressure or  
counterclockwise to decrease pressure.  
8. Once desired pressure is established, set thermostat set-  
ting for no call for heat, turn off main gas valve, remove  
1
pressure-measuring device, and replace ⁄8-in. pipe plug  
and screw cap.  
After verifying that the shafts are parallel, loosen the set-  
screws on the motor pulley. Move pulley on the shaft until  
the pulleys are parallel. To move the sheave on the shaft,  
loosen the belts. If necessary, blower sheave can also be moved  
on the shaft.  
Fig. 63 — Gas Valve  
Main Burners — For all applications, main burners are  
factory set and should require no adjustment.  
MAIN BURNER REMOVAL  
1. Shut off (field-supplied) manual main gas valve.  
2. Shut off power to unit.  
3. Remove gas section access door, door frame, and corner  
post.  
4. Disconnect gas piping from gas valve inlet.  
5. Remove wires from gas valve.  
6. Remove wires from rollout switch.  
7. Remove sensor wire and ignitor cable from IGC board.  
8. Remove 2 screws securing manifold bracket to  
basepan.  
9. Remove 2 screws that hold the burner support plate flange  
to the vestibule plate.  
10. Lift burner assembly out of unit.  
Protective Devices  
COMPRESSOR PROTECTION  
Overcurrent — Each compressor has one manual reset, cali-  
brated trip, magnetic circuit breaker. Do not bypass connec-  
tions or increase the size of the circuit breaker to correct trouble.  
Determine the cause and correct it before resetting the breaker.  
Crankcase Heater — Each compressor has a crankcase heater  
to prevent absorption of liquid refrigerant by oil in the crank-  
case when the compressor is idle. Since 115-v power for the  
crankcase heaters is drawn from the unit control circuit, main  
unit power must be on for the heaters to be energized.  
Fig. 62 — Pulley Alignment  
Gas Valve Adjustment  
NATURAL GAS — The gas valve opens and closes in re-  
sponse to the PIC control or limit control.  
IMPORTANT: After a prolonged shutdown or service  
job, energize the crankcase heaters for 24 hours before  
starting the compressor.  
When power is supplied to valve terminals D1 and C2,  
the main valve opens to its preset position.  
The regular factory setting is stamped on the valve body  
(3.3 in. wg).  
To adjust regulator:  
1. Set thermostat at setting for no call for heat.  
2. Turn main gas valve to OFF position.  
3. Remove 1⁄8-in. pipe plug from manifold or gas valve pres-  
sure tap connection. Install a suitable pressure-measuring  
device.  
Compressor Lockout — If any of the safeties (high-pressure,  
or low-pressure) trip, or if there is a loss of power to the  
compressors, the compressors will be locked out. To reset,  
consult the controls and troubleshooting literature for the  
appropriate unit for details.  
EVAPORATOR-FAN MOTOR PROTECTION — A manual  
reset, calibrated trip, magnetic circuit breaker protects against  
overcurrent. Do not bypass connections or increase the size  
of the breaker to correct trouble. Determine the cause and  
correct it before resetting the breaker.  
4. Set main gas valve to ON position.  
5. Set thermostat at setting to call for heat.  
52  
Download from Www.Somanuals.com. All Manuals Search And Download.  
CONDENSER-FAN MOTOR PROTECTION — Each  
condenser-fan motor is internally protected against over-  
temperature. They are also protected against a severe over-  
current condition by manual reset, calibrated trip, magnetic  
circuit breakers on a common circuit. As with the circuit break-  
ers, do not bypass connections or increase breaker size to  
correct trouble. Determine the cause and correct it before  
resetting the breaker.  
pressed. The fault code will also be entered into the fault  
register. The register retains, in sequence, the last 3 fault codes.  
A newly occurring fault code will not change the fault reg-  
ister if it a recurrence of the most recently entered fault. The  
contents of the register can be displayed by performing the  
following steps:  
1. Press DSPL until the MONTR LED is on.  
2. Press  
3. Press  
4. Press  
until U-09 is displayed.  
HIGH- AND LOW-PRESSURE SWITCHES — See Fig. 60  
for compressor mounting locations. Settings for these switches  
are shown in Table 33. If either switch trips, that refrigerant  
circuit will be automatically locked out by the controls. To  
reset, interrupt control power.  
ENTER  
. The current fault code will be displayed.  
. The display will indicate that this is the first  
code in the memory register.  
NOTE: When a pressure transducer is used, the low pres-  
sure trip point is the same as the low-pressure switch.  
5. Continue to press  
to display the other codes in the  
fault resister. After the last code has been displayed, the  
sequence will return to the first code.  
Variable Frequency Drive (VFD)  
SUPPLY FAN VFD — The optional supply fan VFD is lo-  
cated in the auxiliary control box. Wiring should only be  
performed by qualified personnel. All parameters have been  
factory set. Do not change parameters unless necessary.  
The VFD can be easily damaged by static electricity. Use  
proper electrostatic discharge procedures when handling the  
controls of the VFD.  
Never connect main circuit output terminals T1, T2, and  
T3 to AC main circuit power supply. Always ground the VFD  
using the designated ground terminal. Refer to the VFD tech-  
nical manual for more information.  
The VFD can indicate faults and alarms. A blinking alarm  
condition is a warning that a trouble condition will occur or  
that there is a problem in the external circuitry. The VFD  
will continue to operate during an alarm condition. Alarm  
conditions are not entered into the fault register.  
Control Modules — The standard PSIO1 and optional  
PSIO2 (processor modules) and standard DSIO1 and DSIO2  
(high-voltage relay modules) all perform continuous diag-  
nostic evaluations of the hardware condition. Proper opera-  
tion of these modules is indicated by 2 light-emitting diodes  
(LED) on the front surface of the DSIO modules and on the  
top horizontal surface of the PSIO modules.  
RED LED — Blinking continuously at a 3 to 5 second rate  
indicates proper operation. Lit continuously indicates a prob-  
lem requiring replacement of the module. Off continuously  
indicates the power supply should be checked. If there is no  
input power, check the fuses. If a fuse is bad, check for shorted  
secondary of the transformer or a bad module.  
GREEN LED — On a PSIO module, this is the green light  
that is closest to the COMM connectors. The other green  
LED on the module indicates external communications (when  
used). The green LED should always be blinking when power  
is on. It indicates that the modules are communicating prop-  
erly. If the green LED is not blinking, check the red LED.  
If the red LED is normal, check the module addresses.  
A steady fault indicator is displayed when the VFD fault  
relay has tripped. The motor will coast to a stop, and a fault  
signal is output is present.  
Refer to the VFD technical manual for more information  
on alarms and faults.  
NOTE: If the wrong address is entered for the DSIO1 and 2  
and/or PSIO1 and 2, then the wrong input channel will be  
read and the wrong output channel energized.  
If all modules indicate a communication failure, check the  
COMM plug on the PSIO module for proper seating. If a  
good connection is made and the condition persists, replace  
the PSIO module.  
If only the DSIO module indicates a communication fail-  
ure, check the COMM plug on that module for a proper con-  
nection. If a good connection is made and the condition  
persists, replace the DSIO module.  
EXHAUST FAN VFD — The optional exhaust fan VFD con-  
sists of an exhaust fan, motor, VFD, and pressure transducer.  
All components (except the tranducer) are located in the re-  
turn air section of the 48/50MP, through the hinged access  
door. The BP transducer is located in the auxiliary control  
box. Wiring should only be performed by qualified person-  
nel. All parameters have been factory set. Do not change pa-  
rameters unless necessary.  
The VFD can be easily damaged by static electricity. Use  
proper electrostatic discharge procedures when handling the  
controls of the VFD.  
All system operating intelligence resides in the PSIO mod-  
ule. This module monitors conditions through the input and  
output ports and the DSIO modules.  
The machine operator communicates with the micro-  
processor through the HSIO keypad and display module. Com-  
munication between the PSIO and the other modules is  
accomplished by a 3-wire sensor bus. These 3 wires run in  
parallel from module to module.  
On the sensor bus terminal strips, terminal 1 of the PSIO1  
module is connected to Terminal 1 of all of the other mod-  
ules. Terminals 2 and 3 are connected in the same manner.  
If any of the wires are crossed, the system will not work.  
Never connect main circuit output terminals T1, T2, and  
T3 to AC main circuit power supply. Always ground the VFD  
using the designated ground terminal. Refer to the VFD tech-  
nical manual for more information.  
The VFD can indicate faults and alarms. A blinking alarm  
condition is a warning that a trouble condition will occur or  
that there is a problem in the external circuitry. The VFD  
will continue to operate during an alarm condition. Alarm  
conditions are not entered into the fault register.  
A steady fault indicator is displayed when the VFD fault  
relay has tripped. The motor will coast to a stop, and a fault  
signal is output is present.  
The unit processor modules, the high-voltage relay mod-  
ules, and the HSIO keypad module are all powered from two  
21-vac power sources which connect to terminals 1 and 2 of  
the power input strip on each module.  
Refer to the VFD technical manual for more information  
on alarms and faults.  
DISPLAYING FAULT SEQUENCE — Whenever the fault  
relay trips and shuts down the VFD, the display code of the  
fault that caused the trip will be displayed until RESET is  
53  
Download from Www.Somanuals.com. All Manuals Search And Download.  
16. Press  
to check the remainder of the user con-  
Processor Module(s) (PSIO)  
figuration values.  
INPUTS — Each input channel has 3 terminals; 2 are used.  
17. After completing the configuration steps outlined above,  
close all remaining circuit breakers and perform a unit  
test.  
18. Complete this procedure and restore the unit to normal  
operation by returning the STANDBY/RUN mode to  
STBY NO.  
OUTPUTS— Output of the PSIO module is 24 vdc or  
4 to 20 mA dc. There are 3 terminals; 2 are used.  
REPLACING DEFECTIVE PSIO MODULES — The re-  
placement part number is printed on a label on the front of  
the PSIO module. The replacement module order is config-  
ured as a generic replacement module, which will require  
configuration in the field.  
Before any service work is started, be sure that all elec-  
trical disconnects are open and tagged.  
High-Voltage Relay Modules (DSIO1 and DSIO2)  
INPUTS — Inputs on terminal strip J3 are discrete inputs  
(on/off). When 24 vac is applied across the 2 terminals in a  
channel, it reads as an on signal. Zero v is read as an off  
signal.  
Installation  
1. Verify the existing PSIO module is defective by using  
the procedure described in the Control Modules section  
on this page.  
2. Refer to the Start-Up Checklist on pages CL-1 through  
CL-4 that should have been completed at start-up. This  
information is needed later in this procedure. If the check-  
OUTPUTS — Terminal strips J4 and J5 are internal relays  
whose coils are energized by a signal from the microproces-  
sor. The relays switch the circuit to which they are con-  
nected. No power is supplied to these connections by the  
DSIO module.  
list does not exist, make a new checklist by filling out  
DSIO REPLACEMENT — Before any service work is started,  
be sure that all electrical disconnects are opened and tagged.  
the  
and  
configurations on paper. Tailor  
Installation  
the various options and configurations as needed for this  
particular installation.  
1. Verify the existing DSIO module is defective by using  
the procedure described in the Control Modules section  
on page 53.  
2. Check that all power to the unit is off. Switch off all  
circuit breakers. Carefully disconnect all wires from the  
defective module by unplugging the connectors. It is not  
necessary to remove any of the individual wires from  
the connectors. Remove the green ground wire.  
3. Remove the DSIO module mounting screws and re-  
move the module from the control box. Save the screws.  
4. With a small screwdriver, set the address switches S1  
and S2 on the new DSIO module to match those on the  
defective module.  
5. Mount the new module in the control box using the screws  
saved in Step 3.  
6. Reinstall all of the wire connectors and the green ground  
wire.  
7. Carefully check all wire connections before restoring power  
to the unit.  
3. Check that all power to the unit is off. Switch off all  
circuit breakers. Carefully disconnect all wires from the  
defective module by unplugging the 6 connectors. It is  
not necessary to remove any of the individual wires from  
the connectors. Remove the green ground wire.  
4. Remove the PSIO module mounting screws and remove  
the module from the control box. Save the screws.  
5. With a small screwdriver, set the address switches S1  
and S2 on the new PSIO module to match those on the  
defective module.  
6. Mount the new module in the control box using the screws  
saved in Step 4.  
7. Reinstall all 6 wire connectors and the green ground wire.  
8. Check all wire connections before restoring power to  
the unit.  
9. Verify that the unit ON/OFF switch is in the ON  
position.  
10. Restore power to the unit and close the control circuit  
breaker (CCB). Verify that the red and green LEDs re-  
spond as described in the Control Modules section on  
this page. The HSIO keypad should begin its rotating  
display.  
8. Verify that the unit ON/OFF switch is in the ON  
position.  
9. Restore power to the unit and close the control circuit  
breaker (CCB). Verify that the red and green LEDs  
respond as described in the Control Modules section  
on page 53. The LID (keypad) should begin its rotating  
display.  
10. After completing the configuration steps outlined above,  
close all remaining circuit breakers and perform a unit  
test.  
11. Complete this procedure and restore the unit to normal  
operation by returning the STANDBY/RUN mode to  
STBY NO.  
11. Using the HSIO keypad and display module, press  
to verify that the software version matches the version  
number shown on the PSIO label.  
12. Press  
to verify that the factory configuration  
codes agree with the values listed in Table 24 on  
page 37.  
13. Set other applicable inputs required in  
and  
to match the options and accessories installed on the  
equipment.  
Refrigerant Feed Components — Each refrigerant  
circuit (2 per unit) has all the necessary refrigerant controls.  
14. Enable data reset function to store all data. The HSIO  
ENTER  
keypad display will blank out after pressing the  
key  
Thermostatic Expansion Valve (TXV) — On 48/  
50MP units, each circuit has 2 TXVs on which superheat  
may be adjusted if absolutely necessary.  
The TXV is set to maintain 10 to 13 F superheat leaving  
the evaporator coil. It controls the flow of refrigerant to the  
evaporator coils.  
while displaying data reset (DTRS). The rotating dis-  
play returns when the data reset has been completed.  
15. Press  
and verify each item is now configured  
as needed for this particular installation. Verify the fac-  
tory default settings for both a specified unit and  
generic control unit.  
54  
Download from Www.Somanuals.com. All Manuals Search And Download.  
5. Disconnect power wires at terminal box and disconnect  
conduit.  
6. Disconnect wires from crankcase heater.  
7. Disconnect service valves from compressor.  
Hot Gas Bypass — An optional hot gas bypass system  
may be factory installed on circuit no. 1. This system will  
introduce discharge vapor from the compressor discharge line  
into the distributors and evaporator coil circuits on circuit  
no. 1 when suction pressures drop to damaging levels. No  
field adjustments of the hot gas bypass valve should be  
required.  
NOTE: On units with 2 compressors per circuit, discon-  
nect both oil equalizer lines located on the motor barrel  
and on the oil pump sump.  
Condenser Fans — Each fan is supported by a formed  
wire mount bolted to fan deck and covered with a wire guard.  
The exposed end of the fan motor shaft is protected from  
weather by grease. If fan motor must be removed for service  
or replacement, be sure to regrease fan shaft and reinstall  
8. Units 48/50MP62L:  
a. Remove 4 large screws securing compressor mount-  
ing pan to unit base rail.  
b. Slide compressor (on mounting pan) to outside of unit  
frame; support and/or lower to ground.  
7
fan guard. For proper performance, fan should be ⁄8 in.  
(22 mm) below top of venturi on the fan deck to top of  
the fan hub. (See Fig. 64.) Tighten set screws to 15 ± 1 ft-lbs  
(20 ± 1.3 N-m). Figure 64 shows proper position of  
mounted fan.  
c. Unbolt compressor from mounting pan and remove.  
9. Units 48/50MP70M,82N,90P,10R:  
a. Remove 4 large screws securing compressor to the com-  
pressor rails.  
b. Lift compressor off mounting bolts and remove.  
Compressor Replacement — Perform the following:  
1. Reverse procedure in Compressor Removal section to end  
of Step 4.  
2. Reinstall service valves and safety switches, and tighten  
to torques as listed:  
TORQUE  
COMPRESSOR(S)  
Tighten discharge valves to —  
20-25 ft-lbs ( 27- 34 N-m)  
80-90 ft-lbs (109-122 N-m)  
06E-250  
06E-265,275,299  
Tighten suction valves to —  
80- 90 ft-lbs (109-122 N-m)  
90-120 ft-lbs (122-163 N-m)  
06E-250  
06E-265,275,299  
Tighten the following fittings as specified —  
120 in.-lbs (13.5 N-m)  
120 in.-lbs (13.5 N-m)  
High-Pressure Switch  
Low-Pressure Switch  
3. Leak-check and evacuate system, reclaim refrigerant.  
4. Recharge system per pre-start-up and start-up sequences.  
Recheck oil levels.  
5. Energize crankcase heater for 24 hours prior to restart of  
system.  
NOTE: Fan rotation is clockwise when viewed from top of unit.  
Fig. 64 — Condenser Fan Adjustment  
TROUBLESHOOTING  
The 48/50MP units provide extensive troubleshooting in-  
formation to service personnel through the use of status codes  
and alarm and alert codes from the control system, which  
are displayed on the unit HSIO or through the use of Service  
Tool or CCN Building Supervisor. For more information on  
diagnostics, codes, and possible causes, refer to the Controls  
and Troubleshooting manual.  
Use the Quick Test function to check control inputs and  
outputs (including economizer actuators). Refer to Controls  
and Troubleshooting Guide.  
IMPORTANT: Check for proper fan rotation (clock-  
wise viewed from above). If necessary to reverse, switch  
leads.  
Compressor Removal — Access to the pump end of  
the compressor is from the compressor side of the unit.  
Access to the motor end of the compressor is from the inside  
of the unit. All compressors can be removed from the com-  
pressor side of the unit.  
If there are indications of hunting (rapid oscillations) of  
control functions (such as duct static pressure or supply air  
temperature), or if the response rate is too slow, check the  
gain values. Refer to the Control Loop Checkout section on  
page 40 for more information.  
IMPORTANT: All compressor mounting hardware and  
support brackets removed during servicing must be re-  
installed prior to start-up.  
If the unit is equipped with an optional VFD and the sup-  
ply or exhaust fan is not running when required, refer to the  
troubleshooting section of the separate VFD technical manual  
provided with the unit.  
For troubleshooting information on mechanical systems,  
refer to the troubleshooting and diagnostics table on the next  
page.  
1. Disconnect power to unit; lockout power to compressor.  
2. Close suction and discharge service valves.  
3. Relieve refrigerant pressure into a refrigerant recovery  
system.  
4. Remove:  
a. Fan-cycling pressure switch (FCPS)  
b. High-pressure switch  
c. Low-pressure switch  
55  
Download from Www.Somanuals.com. All Manuals Search And Download.  
TROUBLESHOOTING AND DIAGNOSTICS  
PROBLEM  
COMPRESSOR DOES NOT RUN  
SOLUTION  
Contactor Open  
1. Power off.  
1. Restore power.  
2. Fuses blown in field power circuit.  
3. Alarm tripped.  
2. After finding cause and correcting, replace with correct size fuse.  
3. Check alarm history on HSIO.  
4. No control power.  
4. Check secondary fuse(s); replace with correct type and size. Re-  
place transformer if primary windings receiving power.  
5. Check for excessive compressor current draw. Reset breaker; re-  
place if defective.  
6. Reset lockout circuit at HSIO or circuit breaker.  
7. Check for refrigerant undercharge, obstruction of indoor airflow, or  
whether compressor suction shutoff valve is fully open. Make sure  
liquid line solenoid valve(s) is open.  
8. Check for refrigerant overcharge, obstruction of outdoor airflow, air in  
system or whether compressor discharge valve is fully open. Be sure  
outdoor fans are operating correctly.  
9. Tighten all connections.  
10. See 06E compressor service literature.  
5. Compressor circuit breaker tripped.  
6. Safety device lockout circuit active.  
7. Low-pressure switch open.  
8. High-pressure switch open.  
9. Loose electrical connections.  
10. Compressor stuck.  
Contactor Closed  
1. Compressor leads loose.  
2. Motor windings open.  
3. Single phasing.  
1. Check connections.  
2. See 06E compressor service literature.  
3. Check for blown fuse. Check for loose connection at  
compressor terminal.  
COMPRESSOR STOPS ON HIGH-PRESSURE SWITCH  
Outdoor Fan On  
1. High-pressure switch faulty.  
2. Airflow restricted.  
3. Air recirculating.  
1. Replace switch.  
2. Remove obstruction.  
3. Clear airflow area.  
4. Noncondensables in system.  
5. Refrigerant overcharge.  
6. Line voltage incorrect.  
7. Refrigerant system restrictions.  
4. Purge and recharge as required.  
5. Purge as required.  
6. Consult power company.  
7. Check or replace filter drier, expansion valve, etc. Check that com-  
pressor discharge valve is fully open.  
Outdoor Fan Off  
1. Fan slips on shaft.  
2. Motor not running.  
3. Motor bearings stuck.  
4. Motor overload open.  
5. Motor burned out.  
1. Tighten fan hub setscrews.  
2. Check power and capacitor.  
3. Replace bearings.  
4. Check overload rating. Check for fan blade obstruction.  
5. Replace motor.  
COMPRESSOR CYCLES ON LOW-PRESSURE SWITCH  
Indoor-Air Fan Running  
1. Filter drier plugged.  
2. Expansion valve power head defective.  
3. Low refrigerant charge.  
1. Replace filter drier.  
2. Replace power head.  
3. Add charge. Check low-pressure switch setting.  
Airflow Restricted  
1. Coil iced up.  
2. Coil dirty.  
3. Air filters dirty.  
4. Dampers closed.  
1. Check refrigerant charge.  
2. Clean coil fins.  
3. Clean or replace filters.  
4. Check damper operation and position.  
Indoor-Air Fan Stopped  
1. Electrical connections loose.  
2. Fan relay defective.  
1. Tighten all connections.  
2. Replace relay.  
3. Motor overload open.  
4. Motor defective.  
3. Power supply.  
4. Replace motor.  
5. Replace or tighten belt.  
5. Fan belt broken or slipping.  
LEGEND  
HSIO  
DSIO  
VFD  
—
—
—
Human Sensory Input/Output Device  
Processor Module  
Variable Frequency Drive  
56  
Download from Www.Somanuals.com. All Manuals Search And Download.  
TROUBLESHOOTING AND DIAGNOSTICS (cont)  
PROBLEM  
SOLUTION  
COMPRESSOR RUNNING BUT COOLING INSUFFICIENT  
Suction Pressure Low  
1. Refrigerant charge low.  
2. Head pressure low.  
1. Add refrigerant.  
2. Check refrigerant charge.  
3. Clean or replace filters.  
4. Replace power head.  
5. Check low-pressure setting.  
6. Remove obstruction.  
3. Air filters dirty.  
4. Expansion valve power head defective.  
5. Indoor coil partially iced.  
6. Indoor airflow restricted.  
Suction Pressure High  
1. Unloaders not functioning.  
2. Compressor valve defective.  
3. Heat load excessive.  
1. Check unloader adjustments. Check unloader setting.  
2. See 06E compressor service literature.  
3. Check for open doors or windows in vicinity of fan coil.  
UNIT OPERATES TOO LONG OR CONTINUOUSLY  
1. Low refrigerant charge.  
1. Add refrigerant.  
2. Control contacts fused.  
2. Replace control.  
3. Air in system.  
4. Partially plugged expansion valve or filter drier.  
3. Purge and evacuate system.  
4. Clean or replace.  
SYSTEM IS NOISY  
1. Piping vibration.  
2. Compressor noisy.  
1. Support piping as required.  
2. Check valve plates for valve noise. Replace compressor if bearings  
are worn.  
COMPRESSOR LOSES OIL  
1. Leak in system.  
1. Repair leak.  
2. Check wiring and relays. Check heater and replace if  
defective.  
2. Crankcase heaters not energized during shutdown.  
FROSTED SUCTION LINE  
Expansion valve admitting excess refrigerant.  
Adjust expansion valve.  
HOT LIQUID LINE  
1. Shortage of refrigerant due to leak.  
2. Expansion valve opens too wide.  
1. Repair leak and recharge.  
2. Adjust expansion valve.  
FROSTED LIQUID LINE  
Restricted filter drier.  
Remove restriction or replace.  
COMPRESSOR WILL NOT UNLOAD  
1. Defective unloader.  
2. Defective capacity control solenoid valve.  
3. Miswired capacity control liquid line solenoid.  
1. Replace unloader.  
2. Replace valve.  
3. Rewire correctly.  
COMPRESSOR WILL NOT LOAD  
1. Miswired capacity control liquid line solenoid.  
2. Defective capacity control solenoid valve.  
3. Plugged strainer (high side).  
1. Rewire correctly.  
2. Replace valve.  
3. Clean or replace strainer.  
4. Clean or replace the necessary parts.  
4. Stuck or damaged unloader piston or piston ring(s).  
CONTACTOR OPEN  
1. Power off.  
1. Restore power.  
2. Fuses blown in field power circuit.  
3. No control power.  
2. After finding cause and correcting, replace with correct fuses.  
3. Check secondary fuses. Replace with correct type and size. Replace  
transformer if primary windings are receiving power.  
4. Check unit status at HSIO. Check alerts and alarms at HSIO. Cor-  
rect as required and reset.  
4. No demand by unit control.  
5. Fan status switch not closed.  
6. VFD overload function tripped.  
5. Check continuity at fan status switch contacts. Check wiring from fan  
status switch to PSIO no. 1, channel 12.  
6. Refer to separate VFD technical manual for troubleshooting instruc-  
tions.  
7. Motor leads loose.  
8. Motor windings open.  
9. Single phasing.  
7. Check connections at motor lead junction box.  
8. Check motor windings.  
9. Check for blown fuse. Check for loose connections at motor junction  
box.  
10. Belts broken or thrown.  
11. Fan status switch contacts defective.  
10. Check belts. Replace as complete set if necessary.  
11. Check for input signal at PSIO no. 1, channel 12. Replace switch if  
defective.  
CONTACTOR CLOSED  
1. No output signal from control at PSIO no. 1,  
channel 16.  
1. Check alerts and alarms at HSIO. Check status at HSIO.  
Replace PSIO no. 1.  
2. Check for input signal at VFD, terminals FI (+) and FC (-).  
3. Check switch continuity. Replace switch if defective.  
2. Communication failure at VFD.  
3. Fan status switch contacts defective.  
LEGEND  
HSIO  
DSIO  
VFD  
—
—
—
Human Sensory Input/Output Device  
Processor Module  
Variable Frequency Drive  
57  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Refer to Fig. 65 for IGC troubleshooting information.  
LEGEND  
IGC  
PIC  
—
—
Integrated Gas Unit Controller  
Product Integrated Control  
Fig. 65 — IGC Control (Heating) — 48MP Units Only  
58  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
PACKAGED SERVICE TRAINING  
Packaged Service Training programs are an excellent way to increase your knowledge of the equip-  
ment discussed in this manual, including:  
• Unit Familiarization  
• Installation Overview  
• Maintenance  
• Operating Sequence  
A large selection of product, theory, and skills programs are available, using popular video-based for-  
mats and materials. All include video and/or slides, plus companion book.  
Classroom Service Training which includes ‘‘hands-on’’ experience with the products in our labs can  
mean increased confidence that really pays dividends in faster troubleshooting and fewer callbacks.  
Course descriptions and schedules are in our catalog.  
CALL FOR FREE CATALOG 1-800-962-9212  
[
] Packaged Service Training  
[
] Classroom Service Training  
Copyright 1998 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book 1 PC 111 Catalog No. 534-893 Printed in U.S.A. Form 48/50MP-1SI Pg 60 12-98 Replaces: 50MP-1SI  
Tab 1a 1b  
1
Download from Www.Somanuals.com. All Manuals Search And Download.  
START-UP CHECKLIST  
MODEL NO.:  
DATE:  
SERIAL NO.:  
TECHNICIAN:  
I. PRE-START-UP:  
Ⅺ VERIFY THAT UNIT IS LEVEL  
Ⅺ VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT  
Ⅺ LOOSEN ALL SHIPPING HOLDDOWN BOLTS AND REMOVE SHIPPING BRACKETS PER INSTRUCTIONS  
Ⅺ VERIFY THAT COMPRESSOR SUSPENSION SPRINGS HAVE BEEN LOOSENED PER INSTRUCTIONS  
Ⅺ VERIFY ASSEMBLY OF ECONOMIZER HOOD  
Ⅺ VERIFY INSTALLATION OF EXHAUST HOOD  
Ⅺ VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS  
Ⅺ VERIFY THAT POWER SUPPLY MATCHES UNIT DATA PLATE  
Ⅺ VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT  
Ⅺ CHECK GAS PIPING FOR LEAKS (48MP ONLY)  
Ⅺ CHECK THAT INDOOR-AIR FILTERS ARE CLEAN AND IN PLACE  
Ⅺ CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE, AND VERIFY SET SCREW  
IS TIGHT  
Ⅺ VERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED  
Ⅺ OPEN SUCTION, DISCHARGE, AND LIQUID LINE SERVICE VALVES  
Ⅺ CHECK COMPRESSOR OIL LEVEL SIGHT GLASS AND VERIFY PROPER LEVEL  
Ⅺ VERIFY THAT CRANKCASE HEATERS HAVE BEEN ENERGIZED FOR 24 HOURS  
Ⅺ CHECK VOLTAGE IMBALANCE  
LINE-TO-LINE VOLTS:  
(AB + AC + BC)/3 = AVERAGE VOLTAGE =  
MAXIMUM DEVIATION FROM AVERAGE VOLTAGE =  
AB  
V
AC  
V
BC  
V
V
V
VOLTAGE IMBALANCE = 100 X (MAX DEVIATION)/(AVERAGE VOLTAGE) =  
%
IF OVER 2% VOLTAGE IMBALANCE, DO NOT ATTEMPT TO START SYSTEM!  
CALL LOCAL POWER COMPANY FOR ASSISTANCE.  
II. PRELIMINARY CHECKLIST ITEMS (DETERMINE BEFORE CONFIGURING CONTROLS):  
CONTROL SETTINGS FOR NON-NETWORKED, FREESTANDING UNIT  
Ⅺ UNIT TO BE OPERATED ON CONSTANT AIR VOLUME (CV) RATHER THAN VARIABLE-AIR VOLUME (VAV)  
Ⅺ CONFIRM THAT SPACE TEMPERATURE SENSOR (T55) HAS BEEN WIRED CORRECTLY PER SPACE  
TEMPERATURE SENSOR (T55) SECTION ON PAGE 17.  
Ⅺ CONFIRM THAT TUBING FOR SPACE AND SUPPLY DUCT PRESSURES HAS BEEN INSTALLED  
Ⅺ SET ENTHALPY CONTROL SET POINT ON ECONOMIZER  
Ⅺ SET SUPPLY FAN AND ‘‘CHECK FILTER’’ STATUS SWITCHES FOR JOB REQUIREMENTS  
UNIT OPTION CHECKLIST  
ITEM  
PRESENT?  
A
B
C
D
E
Ⅺ
Ⅺ
Ⅺ
Ⅺ
Ⅺ
CONSTANT VOLUME POWER EXHAUST  
VARIABLE VOLUME POWER EXHAUST  
VARIABLE FREQUENCY DRIVE ON SUPPLY FAN (VAV ONLY)  
HOT GAS BYPASS  
VAV WITH OCCUPIED HEAT  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book 1 PC 111 Catalog No. 534-893 Printed in U.S.A. Form 48/50MP-1SI CL-1 12-98 Replaces: 50MP-1SI  
Tab 1a 1b  
1
Download from Www.Somanuals.com. All Manuals Search And Download.  
III. PRELIMINARY CHECKLIST ITEMS (cont)  
CHANGES TO DEFAULT VALUES  
Ⅺ RECORD ALL CHANGES MADE TO FACTORY DEFAULT VALUES  
IV. START-UP  
CHECK EVAPORATOR FAN SPEED AND RECORD.  
CHECK CONDENSER FAN SPEED AND RECORD.  
AFTER AT LEAST 10 MINUTES RUNNING TIME, RECORD THE FOLLOWING MEASUREMENTS:  
COMP A1  
COMP A2  
COMP B1  
COMP B2  
OIL PRESSURE  
SUCTION PRESSURE  
SUCTION LINE TEMP  
DISCHARGE PRESSURE  
DISCHARGE LINE TEMP  
ENTERING CONDENSER AIR TEMP  
LEAVING CONDENSER AIR TEMP  
EVAP ENTERING AIR DB TEMP  
EVAP ENTERING AIR WB TEMP  
EVAP LEAVING AIR DB TEMP  
EVAP LEAVING AIR WB TEMP  
COMPRESSOR AMPS (L1)  
COMPRESSOR AMPS (L2)  
COMPRESSOR AMPS (L3)  
ELECTRICAL  
SUPPLY FAN AMPS  
ELECTRIC HEAT AMPS L1  
EXHAUST FAN AMPS  
L2 L3  
TEMPERATURES  
OUTDOOR-AIR TEMPERATURE  
RETURN-AIR TEMPERATURE  
COOLING SUPPLY AIR  
F
F
F
DB (Dry-Bulb)  
DB  
F
WB (Wet-Bulb)  
PRESSURES  
GAS INLET PRESSURE  
IN. WG  
GAS MANIFOLD PRESSURE STAGE NO. 1  
REFRIGERANT SUCTION CIRCUIT NO. 1  
REFRIGERANT DISCHARGE CIRCUIT NO. 1  
IN. WG  
PSIG  
STAGE NO. 2  
IN. WG  
PSIG  
CIRCUIT NO. 2  
CIRCUIT NO. 2  
PSIG  
PSIG  
Ⅺ VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS ON PAGES 48 AND 49  
GENERAL  
Ⅺ ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS  
CHECK THE COMPRESSOR OIL LEVEL SIGHT GLASSES; ARE THE SIGHT GLASSES SHOWING  
OIL LEVEL PER INSTRUCTIONS ON PAGE 29.  
(Y/N)  
Ⅺ PERFORM CONTROL CONFIGURATION PROCEDURE ON PAGES CL-3 AND CL-4.  
CL-2  
Download from Www.Somanuals.com. All Manuals Search And Download.  
CONTROL CONFIGURATION  
KEYBOARD  
ENTRY  
DESCRIPTION  
VALUES IN [ ] INDICATE FACTORY DEFAULTS  
DISPLAY  
LOG ON  
Enter password followed by  
Logged on okay  
ENTER  
LOGGEDON  
FACT CFG  
TYPE X  
Factory configuration  
Unit type (0 = CV, 1 = VAV) [Default is 1]  
x
ENTER  
TYPE X  
DTRS  
Verify unit type and change if necessary. If CV unit, see CV  
control configuration.  
Data Reset  
Enable Data Reset  
ENTER  
FACT CFG  
LLAG X  
Factory Configuration  
Use  
to access lead/lag option — disable with  
HGBP (Item D, page CL-1)  
ENTER  
DISABLE  
Disable lead/lag (0 = DIS, 1 = ENB) [1]  
BLD PRES  
Configure building pressure control (modulating power  
exhaust)  
BPS .05  
BPS X  
Use  
for building pressure set point (range 0 to .5) [.05]  
Set building pressure set point per job requirements  
Access log on/off function  
x
ENTER  
LOGGEDON  
LOG OFF  
Use  
to access log off  
Logged off okay  
LOGD OFF  
ENTER  
INPUTS  
Run quick test to verify operation of unit functions  
(see Controls and Troubleshooting Guide)  
through  
SETPOINT  
OHSP X  
Set system set points per job requirements  
Set occupied heat set point (Range 55-80 F) [68] CV only  
Set occupied cool set point (Range 55-80 F) [78] CV only  
Set unoccupied heat set point (Range 40-80 F) [55]  
Set unoccupied cool set point (Range 75-95 F) [90]  
OCSP X  
UHSP X  
UCSP X  
SPSP X  
SASP X  
Set supply duct pressure set point (Range 0-5.0 in. wg) [1.5]  
Set supply air set point temperature (Range 45-70 F) [55]  
TIME  
Current time/date  
dow.hh.mm  
mm.dd.yy  
Set day of week and time  
Set month, day, and year  
DAYLIGHT  
HOLIDAY  
PERIOD X  
Set daylight savings time begin/end dates. Required if job  
conditions require adjustment of clock for daylight savings time  
(see Controls and Troubleshooting Guide)  
Set holiday dates. Required if job conditions require a different  
schedule on holidays than other days (see Controls and Trouble-  
shooting Guide)  
Set occupied/unoccupied schedules. Required if job condi-  
tions require unit to enter unoccupied cycle at programmed  
times of day or days of week (see Controls and Troubleshoot-  
ing Guide)  
through  
NOTE: Data in brackets [ ] is default value.  
CL-3  
Download from Www.Somanuals.com. All Manuals Search And Download.  
CONSTANT VOLUME CONTROL CONFIGURATION  
KEYBOARD  
ENTRY  
DESCRIPTION  
DISPLAY  
FACT CONFIG  
FANM  
Fan Mode  
FANMx  
Select Fan Mode (Auto. = 0, Cont. = 1) [1]  
ENTER  
x
ECONOMIZER  
SMG x.x  
Configure Economizer  
Submaster Gain  
ENTER  
SMG 8.0  
Set SMG to 8.0 [−7.5[  
NOTES:  
Copyright 1998 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book 1 PC 111 Catalog No. 534-893 Printed in U.S.A. Form 48/50MP-1SI CL-4 12-98 Replaces: 50MP-1SI  
Tab 1a 1b  
Download from Www.Somanuals.com. All Manuals Search And Download.  
1

Best Ventilation Hood IEX170 User Manual
Billion Electric Company Network Router 7001 User Manual
Billy Goat Brush Cutter GZ401H User Manual
Black Decker Toaster 399 User Manual
Bolens Blower TB720r User Manual
Bosch Appliances Home Theater Server MBV BPRO 40 User Manual
Brother Network Card 3150CDW User Manual
Bryant Furnace 320AAZ User Manual
Campbell Hausfeld Sander DG480000CK User Manual
Cisco Systems DVR Z870DVB User Manual