Carrier 48TM016 028 User Manual
48TM016-028  
Single-Package Rooftop Units  
Electric Cooling/Gas Heating  
Installation, Start-Up and Service Instructions  
Untrained personnel can perform basic maintenance func-  
tions of cleaning coils and filters and replacing filters. All other  
operations should be performed by trained service personnel.  
When working on air-conditioning equipment, observe precau-  
tions in the literature, tags and labels attached to the unit, and  
other safety precautions that may apply.  
Follow all safety codes. Wear safety glasses and work  
gloves. Use quenching cloth for unbrazing operations. Have  
fire extinguishers available for all brazing operations.  
CONTENTS  
Page  
SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . . . .1  
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32  
Step 1 — Provide Unit Support. . . . . . . . . . . . . . . . . . . . .2  
• ROOF CURB  
• ALTERNATE UNIT SUPPORT  
Step 2 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . . .2  
• POSITIONING  
• ROOF MOUNT  
Step 3 — Field Fabricate Ductwork . . . . . . . . . . . . . . .11  
Step 4 — Make Unit Duct Connections . . . . . . . . . . .11  
Step 5 — Install Flue Hood and Wind Baffle . . . . . .11  
Step 6 — Trap Condensate Drain . . . . . . . . . . . . . . . . .11  
Step 7 — Orifice Change . . . . . . . . . . . . . . . . . . . . . . . . . .12  
Step 8 — Install Gas Piping . . . . . . . . . . . . . . . . . . . . . . .13  
Step 9 — Make Electrical Connections . . . . . . . . . . .13  
• FIELD POWER SUPPLY  
Before performing service or maintenance operations on  
unit, turn off main power switch to unit. Electrical shock  
could cause personal injury.  
1. Improper installation, adjustment, alteration, service,  
or maintenance can cause property damage, personal  
injury, or loss of life. Refer to the User’s Information  
Manual provided with this unit for more details.  
2. Do not store or use gasoline or other flammable  
vapors and liquids in the vicinity of this or any other  
appliance.  
What to do if you smell gas:  
1. DO NOT try to light any appliance.  
2. DO NOT touch any electrical switch, or use any  
phone in your building.  
3. IMMEDIATELY call your gas supplier from a neigh-  
bor’s phone. Follow the gas supplier’s instructions.  
• FIELD CONTROL WIRING  
• OPTIONAL NON-FUSED DISCONNECT  
• OPTIONAL CONVENIENCE OUTLET  
Step 10 — Make Outdoor-Air Inlet  
Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16  
• MANUAL OUTDOOR-AIR DAMPER  
Step 11 — Install Outdoor-Air Hood . . . . . . . . . . . . . .16  
Step 12 — Install All Accessories . . . . . . . . . . . . . . . 17  
• MOTORMASTER® I CONTROL INSTALLATION  
• MOTORMASTER V CONTROL INSTALLATION  
Step 13 — Adjust Factory-Installed Options. . . . . 19  
• PREMIERLINK™ CONTROL  
• ENTHALPY SWITCH/RECEIVER  
• OUTDOOR ENTHALPY CONTROL  
• DIFFERENTIAL ENTHALPY CONTROL  
• OPTIONAL ECONOMI$ERIV AND ECONOMI$ER2  
• ECONOMI$ERIV STANDARD SENSORS  
• ECONOMI$ERIV CONTROL MODES  
4. If you cannot reach your gas supplier, call the fire  
department.  
Step 14 — Install Humidistat for  
Optional MoistureMi$er™ Package. . . . . . . . . . . . 31  
Disconnect gas piping from unit when pressure testing at  
pressure greater than 0.5 psig. Pressures greater than  
0.5 psig will cause gas valve damage resulting in hazardous  
condition. If gas valve is subjected to pressure greater than  
0.5 psig, it must be replaced before use. When pressure  
testing field-supplied gas piping at pressures of 0.5 psig or  
less, a unit connected to such piping must be isolated by  
closing the manual gas valve(s).  
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33-43  
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43-50  
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . 51-56  
INDEX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57  
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . .CL-1  
SAFETY CONSIDERATIONS  
Installation and servicing of air-conditioning equipment can  
be hazardous due to system pressure and electrical compo-  
nents. Only trained and qualified service personnel should in-  
stall, repair, or service air-conditioning equipment.  
IMPORTANT: Units have high ambient operating limits. If  
limits are exceeded, the units will automatically lock the  
compressor out of operation. Manual reset will be required  
to restart the compressor.  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Catalog No. 04-53480016-01 Printed in U.S.A. Form 48TM-4SI Pg 1 3-06 Replaces: 48TM-3SI  
Book 1  
4
Tab 1a 6a  
3
4
NOTES:  
1. Dimensions in ( ) are in millimeters.  
2. Refer to Fig. 4-6 for unit operating weights.  
3. Remove boards at ends of unit and runners prior to rigging.  
4. Rig by inserting hooks into unit base rails as shown. Use corner post from packaging to protect coil from  
damage. Use bumper boards for spreader bars on all units.  
5. Weights do not include optional economizer. Add 90 lb (41 kg) for economizer weight.  
6. Weights given are for aluminum evaporator and condenser coil plate fins.  
All panels must be in place when rigging.  
DIMENSIONS  
MAXIMUM  
UNIT  
48TM  
SHIPPING WEIGHT  
A
B
lb  
kg  
850  
873  
923  
1109  
ft-in.  
mm  
ft-in.  
4-0  
3-2  
3-4  
3-4  
mm  
1219  
964  
1016  
1016  
016  
020  
025  
028  
1875  
1925  
2035  
2445  
6-111/2 2121  
6-111/2 2121  
6-111/2 2121  
6-111/2 2121  
Fig. 3 — Rigging Details  
5
6
7
8
Table 1 — Physical Data  
UNIT 48TM  
016D/F  
020D/F  
025D/F  
028D/F  
NOMINAL CAPACITY (tons)  
15  
18  
20  
25  
OPERATING WEIGHT  
1800  
90  
40  
1850  
90  
40  
1900  
90  
40  
2270  
90  
40  
Economizer  
MoistureMi$er™ Dehumidification Package  
COMPRESSOR/MANUFACTURER  
Quantity...Model (Ckt 1, Ckt 2)  
Scroll, Copeland  
1...ZR125KC,  
1...ZR108KC  
55, 45  
1...ZR94KC, 1...ZR108KC,  
1...ZRU140KC,*  
1...ZR144KC  
50, 50  
1...ZR72KC  
60, 40  
2
1...ZR94KC  
55, 45  
2
Capacity Stages (%)  
Number of Refrigerant Circuits  
Oil (oz) (Ckt 1, Ckt 2)  
2
2
85, 60  
106, 81  
106,106  
136, 106  
REFRIGERANT TYPE  
Expansion Device  
Operating Charge (lb-oz)  
Circuit 1†  
R-22  
TXV  
19-8  
13-8  
19-8  
19-2  
19-11  
13-14  
26-13  
25-10  
Circuit 2  
CONDENSER COIL  
Cross-Hatched 3/8-in. Copper Tubes, Aluminum Lanced,  
Aluminum Pre-Coated, or Copper Plate Fins  
Rows...Fins/in.  
Total Face Area (sq ft)  
4...15  
21.7  
4...15  
21.7  
4...15  
21.7  
3...15 (2 coils)  
43.4  
CONDENSER FAN  
Nominal Cfm  
Propeller Type  
14,200  
10,500  
3...22  
10,500  
3...22  
21,000  
6...22  
Quantity...Diameter (in.)  
Motor Hp...Rpm  
2...30  
1/2...1050  
1100  
1/2...1050  
1100  
1...1075  
3400  
1/2...1050  
2200  
Watts Input (Total)  
EVAPORATOR COIL  
Cross-Hatched 3/8-in. Copper Tubes, Aluminum Lanced or  
Copper Plate Fins, Face Split  
Rows...Fins/in.  
Total Face Area (sq ft)  
4...15  
17.5  
4...15  
17.5  
4...15  
17.5  
4...15  
17.5  
EVAPORATOR FAN  
Quantity...Size (in.)  
Type Drive  
Centrifugal Type  
2...12 x 12  
Belt  
2...12 x 12  
Belt  
2...12 x 12  
Belt  
2...12 x 12  
Belt  
Nominal Cfm  
6000  
5
7200  
5
8000  
10,000  
10  
Motor Hp  
Motor Nominal Rpm  
7.5  
1745  
1745  
1745  
1740  
8.7 [208/230, 575 v] 10.2 [208/230, 575 v]  
Maximum Continuous Bhp  
6.13  
5.90  
9.5 [460 v]  
213T  
11.8 [460 v]  
215T  
Motor Frame Size  
184T  
—
184T  
—
Nominal Rpm High/Low  
—
—
Fan Rpm Range  
Low-Medium Static  
873-1021  
1025-1200  
Ball  
910-1095  
1069-1287  
Ball  
1002-1151  
1193-1369  
Ball  
1066-1283  
1332-1550  
Ball  
High Static  
Motor Bearing Type  
Maximum Allowable Rpm  
Motor Pulley Pitch Diameter  
Min/Max (in.)  
1550  
1550  
1550  
1550  
Low-Medium Static  
High Static  
4.9/5.9  
4.9/5.9  
11/8  
4.9/5.9  
4.9/5.9  
11/8  
5.4/6.6  
5.4/6.6  
13/8  
4.9/5.9  
4.9/5.9  
13/8  
Nominal Motor Shaft Diameter (in.)  
Fan Pulley Pitch Diameter (in.)  
Low-Medium Static  
High Static  
9.4  
9.4  
9.4  
8.0  
8.0  
8.0  
7.9  
6.4  
Nominal Fan Shaft Diameter (in.)  
Belt, Quantity...Type...Length (in.)  
17/16  
17/16  
17/16  
17/16  
Low-Medium Static  
High Static  
1...BX...50  
1...BX...48  
13.3-14.8  
37  
1...BX...50  
1...BX...48  
13.3-14.8  
37  
1...BX...53  
1...BX...50  
14.6-15.4  
37  
2...BX...50  
2...BX...47  
14.6-15.4  
36  
Pulley Center Line Distance (in.)  
Speed Change per Full Turn of  
Movable Pulley Flange (rpm)  
Movable Pulley Maximum Full Turns  
From Closed Position  
Factory Speed  
Factory Speed Setting (rpm)  
Low-Medium Static  
High Static  
44  
34  
44  
45  
6**  
3.5  
6††  
3.5  
1002  
1178  
17/16  
6**  
3.5  
1120  
1328  
17/16  
6††  
3.5  
1182  
1470  
17/16  
Low-Medium Static  
High Static  
965  
1134  
Fan Shaft Diameter at Pulley (in.)  
17/16  
LEGEND  
Bhp  
TXV  
—
—
Brake Horsepower  
Thermostatic Expansion Valve  
*The ZRU140KC compressor is a tandem compressor, consisting of a ZR72KC (25% total  
capacity) and a ZR68KC (24% total capacity).  
†Circuit 1 uses the lower portion of the condenser coil and lower portion of the evaporator  
coils; and Circuit 2 uses the upper portion of both coils.  
**Pulley has 6 turns. Due to belt and pulley size, movable pulley cannot be set to 0 to 11/2  
turns open.  
††Pulley has 6 turns. Due to belt and pulley size, movable pulley cannot be set to 0 to 1/2 turns  
open.  
***Rollout switch is manual reset.  
†††A Liquid Propane kit is available as an accessory.  
¶The 48TM028 unit requires 2-in. industrial-grade filters capable of handling face velocities up  
to 625 ft/min (such as American Air Filter no. 5700 or equivalent).  
NOTE: The 48TM016-028 units have a low-pressure switch (standard) located on the suction  
side.  
9
Table 1 — Physical Data (cont)  
UNIT 48TM  
016D/F  
020D/F  
025D/F  
028D/F  
FURNACE SECTION  
Rollout Switch Cutout Temp (F)***  
Burner Orifice Diameter (in. ...drill size)  
190  
190  
190  
190  
Natural Gas  
Std  
0.1285...30/0.136...29 0.1285...30/0.136...29 0.1285...30/0.136...29 0.1285...30/0.136...29  
Thermostat Heat Anticipator Setting (amps)  
208/230, 575 v  
460 v  
Stage 1  
Stage 2  
Stage 1  
Stage 2  
Stage 1  
Stage 2  
0.98  
0.44  
0.98  
0.44  
0.98  
0.44  
0.98  
0.44  
0.80  
0.80  
0.80  
0.80  
0.44  
0.44  
0.44  
0.44  
Gas Input  
172,000/225,000  
230,000/300,000  
81  
206,000/270,000  
275,000/360,000  
81  
206,000/270,000  
275,000/360,000  
81  
206,000/270,000  
275,000/360,000  
81  
Efficiency (Steady-State) (%)  
Temperature Rise Range  
Manifold Pressure (in. wg)  
Natural Gas  
15-45/20-50  
15-45/20-50  
15-45/20-50  
15-45/20-50  
Std  
Alt  
3.3  
3.3  
1
3.3  
3.3  
1
3.3  
3.3  
1
3.3  
3.3  
1
Liquid Propane†††  
Gas Valve Quantity  
Gas Valve Pressure Range  
in. wg  
5.5-13.5  
5.5-13.5  
5.5-13.5  
5.5-13.5  
psig  
0.235-0.487  
0.235-0.487  
0.235-0.487  
0.235-0.487  
3
3
3
3
Field Gas Connection Size (in.-FPT)  
/
4
/
/
4
/
4
4
HIGH-PRESSURE SWITCH (psig)  
Cutout  
Reset (Auto)  
426  
320  
LOW-PRESSURE SWITCH (psig)  
Cutout  
Reset (Auto)  
27  
44  
FREEZE PROTECTION THERMOSTAT (F)  
Opens  
Closes  
30  
45  
5
5
OUTDOOR-AIR INLET SCREENS  
Quantity...Size (in.)  
Cleanable  
2...20 x 25 x 1  
1...20 x 20 x 1  
RETURN-AIR FILTERS  
Quantity...Size (in.)  
Throwaway¶  
4...20 x 20 x 2  
4...16 x20 x 2  
POWER EXHAUST  
1/2 Hp, 208/230-460 v Motor Direct Drive, Propeller-Fan (Factory-Wired for 460 v)  
LEGEND  
Bhp — Brake Horsepower  
TXV — Thermostatic Expansion Valve  
*The ZRU140KC compressor is a tandem compressor, consisting of a ZR72KC (25% total  
capacity) and a ZR68KC (24% total capacity).  
†Circuit 1 uses the lower portion of the condenser coil and lower portion of the evaporator  
coils; and Circuit 2 uses the upper portion of both coils.  
**Pulley has 6 turns. Due to belt and pulley size, movable pulley cannot be set to 0 to 11/2  
turns open.  
††Pulley has 6 turns. Due to belt and pulley size, movable pulley cannot be set to 0 to 1/2 turns  
open.  
***Rollout switch is manual reset.  
†††A Liquid Propane kit is available as an accessory.  
¶The 48TM028 unit requires 2-in. industrial-grade filters capable of handling face velocities up  
to 625 ft/min (such as American Air Filter no. 5700 or equivalent).  
NOTE: The 48TM016-028 units have a low-pressure switch (standard) located on the suction  
side.  
10  
Step 3 — Field Fabricate Ductwork — Secure all  
ducts to building structure. Use flexible duct connectors be-  
tween unit and ducts as required. Insulate and weatherproof all  
external ductwork, joints, and roof openings with counter  
flashing and mastic in accordance with applicable codes.  
Ducts passing through an unconditioned space must be in-  
sulated and covered with a vapor barrier.  
Step 5 — Install Flue Hood and Wind Baffle —  
Flue hood and wind baffle are shipped secured under main  
control box. To install, secure flue hood to access panel. See  
Fig. 10. The wind baffle is then installed over the flue hood.  
NOTE: When properly installed, flue hood will line up with  
combustion fan housing. See Fig. 11.  
Step 6 — Trap Condensate Drain — See Fig. 12  
for drain location. One 3/4-in. half coupling is provided inside  
unit evaporator section for condensate drain connection. An  
81/2-in. x 3/4-in. diameter and 2-in. x 3/4-in. diameter pipe nip-  
Step 4 — Make Unit Duct Connections — Unit  
is shipped for thru-the-bottom duct connections. Ductwork  
openings are shown in Fig. 1 and 4-6. Duct connections are  
shown in Fig. 7. Field-fabricated concentric ductwork may be  
connected as shown in Fig. 8 and 9. Attach all ductwork to roof  
curb and roof curb basepans.  
3
ple, coupled to standard /4-in. diameter elbows, provide a  
straight path down through hole in unit base rails (see Fig. 13).  
A trap at least 4-in. deep must be used.  
NOTE: Dimensions A, A′, B, and B′ are obtained from field-supplied  
ceiling diffuser.  
Shaded area indicates block-off panels.  
NOTE: Do not drill in this area; damage to basepan may result in  
water leak.  
Fig. 9 — Concentric Duct Details  
Fig. 7 — Air Distribution — Thru-the-Bottom  
WIND  
BAFFLE  
NOTE: Do not drill in this area; damage to basepan may result in  
water leak.  
Fig. 10 — Flue Hood Location  
Fig. 8 — Concentric Duct Air Distribution  
11  
Step 7 — Orifice Change — This unit is factory as-  
sembled for heating operation using natural gas at an elevation  
from sea level to 2000 ft. This unit uses orifice type  
LH32RFnnn, where “nnn” indicates the orifice size based on  
drill size diameter in thousands of an inch.  
INDUCED DRAFT  
MOTOR  
HIGH ELEVATION (Above 2000 ft) — Use accessory high  
altitude kit when installing this unit at an elevation of 2000 to  
7000 ft. For elevations above 7000 ft, refer to Table 2 to identi-  
fy the correct orifice size for the elevation. See Table 3 for the  
number of orifices required for each unit size. Purchase these  
orifices from your local Carrier dealer. Follow instructions in  
accessory Installation Instructions to install the correct orifices.  
Table 2 — Altitude Compensation*  
NATURAL GAS ORIFICE†  
ELEVATION (ft)  
Low Heat  
High Heat  
0-1,999  
2,000  
3,000  
4,000  
5,000  
6,000  
7,000  
8,000  
9,000  
10,000  
30  
30  
31  
31  
31  
31  
32  
32  
33  
35  
29  
29  
30  
30  
30  
30  
31  
31  
31  
32  
MAIN BURNER HEAT EXCHANGER  
SECTION  
SECTION  
COMBUSTION  
FAN HOUSING  
Fig. 11 — Combustion Fan Housing Location  
*As the height above sea level increases, there is less oxygen per  
cubic foot of air. Therefore, heat input rate should be reduced at  
higher altitudes. Includes a 4% input reduction per each 1000 ft.  
†Orifices available through your Carrier dealer.  
Table 3 — Orifice Quantity  
UNIT  
ORIFICE QUANTITY  
48TMD016  
5
48TMD020,  
48TMD024,  
48TMD028,  
48TMF016  
48TMF020,  
48TMF024,  
48TMF028  
6
7
CONVERSION TO LP (Liquid Propane) GAS — Use acces-  
sory LP gas conversion kit when converting this unit for use  
with LP fuel usage for elevations up to 7000 ft. For elevations  
above 7000 ft, refer to Table 4 to identify the correct orifice  
size for the elevation. See Table 3 for the number of orifices  
required for each unit size. Purchase these orifices from your  
local Carrier dealer. Follow instructions in accessory Installa-  
tion Instructions to install the correct orifices.  
3/4" FPT DRAIN  
CONNECTION  
1-3/8"  
DRAIN HOLE  
Fig. 12 — Condensate Drain Details  
(48TM016 Shown)  
Table 4 — LP Gas Conversion*  
ELEVATION (ft)  
LP GAS ORIFICE†  
0-1,999  
2,000  
3,000  
4,000  
5,000  
6,000  
7,000  
8,000  
9,000  
10,000  
36  
37  
38  
38  
39  
40  
41  
41  
42  
43  
*As the height above sea level increases, there is less oxygen per  
cubic foot of air. Therefore, heat input rate should be reduced at  
higher altitudes. Includes a 4% input reduction per each 1000 ft.  
†Orifices available through your Carrier dealer.  
Fig. 13 — Condensate Drain Piping Details  
12  
Field wiring must confirm to temperature limitations for  
type “T” wire. All field wiring must comply with NEC and lo-  
cal requirements.  
Transformer no. 1 is wired for 230-v unit. If 208/230-v unit  
is to be run with 208-v power supply, the transformer must be  
rewired as follows:  
1. Remove cap from red (208 v) wire.  
2. Remove cap from orange (230 v) spliced wire.  
3. Replace orange wire with red wire.  
4. Recap both wires.  
Step 8 — Install Gas Piping — Unit is equipped for  
use with natural gas. Installation must conform with local  
building codes or, in the absence of local codes, with the  
National Fuel Gas Code, ANSI Z223.1.  
Install field-supplied manual gas shutoff valve with a 1/8-in.  
NPT pressure tap for test gage connection at unit. Field gas  
piping must include sediment trap and union. See Fig. 14.  
Do not pressure test gas supply while connected to unit.  
Always disconnect union before servicing. Exceeding  
maximum manifold pressure may cause explosion and  
injury.  
Be certain unused wires are capped. Failure to do so may  
damage the transformers.  
IMPORTANT: Natural gas pressure at unit gas connec-  
tion must not be less than 5.5 in. wg or greater than  
13.5 in. wg.  
Operating voltage to compressor must be within voltage  
range indicated on unit nameplate. On 3-phase units, voltages  
between phases must be balanced within 2%.  
Unit failure as a result of operation on improper line voltage  
or excessive phase imbalance constitutes abuse and may cause  
damage to electrical components.  
Size gas-supply piping for 0.5-in. wg maximum pressure  
drop. Do not use supply pipe smaller than unit gas connection.  
FIELD CONTROL WIRING — Install a Carrier-approved  
accessory thermostat assembly according to installation in-  
structions included with accessory. Locate thermostat assembly  
on a solid interior wall in the conditioned space to sense aver-  
age temperature.  
Route thermostat cable or equivalent single leads of  
colored wire from subbase terminals through conduit in unit to  
low-voltage connections as shown on unit label wiring diagram  
and in Fig. 16.  
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American  
Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft,  
use no. 16 AWG insulated wire (35 C minimum). For over  
75 ft, use no. 14 AWG insulated wire (35 C minimum). All  
wire larger than no. 18 AWG cannot be directly connected at  
the thermostat and will require a junction box and splice at the  
thermostat.  
Fig. 14 — Field Gas Piping  
Set heat anticipator settings as follows:  
Step 9 — Make Electrical Connections  
FIELD POWER SUPPLY — Unit is factory wired for volt-  
age shown on nameplate.  
VOLTAGE  
W1  
W2  
0.44  
0.44  
208/230,575  
0.98  
0.80  
460  
When installing units, provide a disconnect per NEC  
(National Electrical Code) of adequate size (Table 5).  
All field wiring must comply with NEC and local  
requirements.  
Settings may be changed slightly to provide a greater degree  
of comfort for a particular installation.  
Route power ground lines through control box end panel or  
unit basepan (see Fig. 4-6) to connections as shown on unit  
wiring diagram and Fig. 15.  
The correct power phasing is critical in the operation of the  
scroll compressors. An incorrect phasing will cause the  
compressor to rotate in the wrong direction. This may lead  
to premature compressor failure.  
The unit must be electrically grounded in accordance with  
local codes and NEC ANSI/NFPA 70 (National Fire Pro-  
tection Association) to protect against fire and electrical  
shock.  
NOTE: The maximum wire size for TB1 is 2/0.  
LEGEND  
EQUIP — Equipment  
GND  
NEC  
TB  
— Ground  
— National Electrical Code  
— Terminal Block  
Fig. 15 — Field Power Wiring Connections  
13  
OPTIONAL NON-FUSED DISCONNECT — On units with  
the optional non-fused disconnect, incoming power will be  
wired into the disconnect switch. Refer to Fig. 17 for wiring  
for 100 and 200 amp disconnect switches. Units with an  
MOCP (maximum overcurrent protection) under 100 will use  
the 100 amp disconnect switch. Units with an MOCP over 100  
will use the 200 amp disconnect switch. Refer to the applicable  
disconnect wiring diagram.  
THERMOSTAT ASSEMBLY  
REMOVABLE JUMPER  
L
RC  
Y1  
Y1  
Y2  
Y2  
W1  
W1  
G
G
C
C
X
X
RH  
W2  
W2  
R
To prevent breakage during shipping, the disconnect han-  
dle and shaft are shipped and packaged inside the unit control  
box. Install the disconnect handle before unit operation. To in-  
stall the handle and shaft, perform the following procedure:  
Fig. 16 — Field Control Thermostat Wiring  
1. Open the control box door and remove the handle and  
shaft from shipping location.  
6T3 4T2 2T1 LOAD  
2. Loosen the Allen bolt located on the disconnect switch.  
The bolt is located on the square hole and is used to hold  
the shaft in place. The shaft cannot be inserted until the  
Allen bolt is moved.  
3. Insert the disconnect shaft into the square hole on the dis-  
connect switch. The end of the shaft is specially cut and  
the shaft can only be inserted in the correct orientation.  
5L3 3L2 1L1 LINE  
4. Tighten the Allen bolt to lock the shaft into position.  
5. Close the control box door.  
6. Attach the handle to the external access door with the two  
screws provided. When the handle is in the ON position,  
the handle will be vertical. When the handle is in the OFF  
position, the handle will be horizontal.  
7. Turn the handle to the OFF position and close the door.  
The handle should fit over the end of the shaft when the  
door is closed.  
8. The handle must be in the OFF position to open the con-  
trol box door.  
NOTE: The disconnect takes the place of TB-1 as shown on the unit wiring dia-  
gram label and the component arrangement label.  
Fig. 17 — Optional Non-Fused Disconnect Wiring  
OPTIONAL CONVENIENCE OUTLET — On units with  
optional convenience outlet, a 115-v GFI (ground fault inter-  
rupt) convenience outlet receptacle is provided for field wiring.  
7
Field wiring should be run through the /8-in. knockout pro-  
vided in the basepan near the return air opening.  
14  
Table 5 — Electrical Data  
COMPRESSOR  
No. 1A  
VOLTAGE  
RANGE  
POWER  
COMBUSTION  
FAN MOTOR  
POWER  
SUPPLY  
NOMINAL  
VOLTAGE  
OFM  
IFM  
FLA  
5.0 15.8/15.8  
UNIT  
EXHAUST  
No. 1  
No. 2  
48TM  
(3 Ph, 60 Hz)  
Min Max RLA LRA RLA LRA RLA LRA Qty Hp FLA (ea) Hp  
FLA LRA  
FLA  
0.57  
0.57  
0.30  
0.30  
0.57  
0.57  
0.57  
0.57  
0.30  
0.30  
0.57  
0.57  
0.57  
0.57  
0.30  
0.30  
0.57  
0.57  
0.57  
0.57  
0.30  
0.30  
0.57  
0.57  
MCA  
MOCP*  
—
—
82/82 110/110  
86/86 110/110  
208/230  
460  
187  
414  
518  
187  
414  
253 32.1 195  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
20.7 156  
3
3
3
3
3
3
2
2
2
6
6
6
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
1
1.7  
0.8  
0.75  
1.7  
0.8  
0.75  
6.6  
3.3  
3.4  
1.7  
0.8  
0.8  
4.6 18.8  
—
2.3  
—
—
41  
43  
31  
34  
50  
50  
40  
40  
016  
020  
025  
028  
508 16.4  
633 12  
95  
80  
10  
70  
54  
5.0  
5.0  
7.9  
6.0  
6.0  
—
575  
8.2  
2.1  
—
4.8  
—
87/87 110/110  
92/92 110/110  
208/230  
460  
253 30.1 225  
508 15.5 114  
28.8 195  
5.0 15.8/15.8  
4.6 18.8  
—
2.3  
—
—
44  
47  
34  
36  
50  
60  
40  
40  
14.7  
10.7  
95  
80  
5.0  
5.0  
7.9  
6.0  
6.0  
—
575  
518 632.5 12.1  
80  
2.1  
—
4.8  
—
124/124 150/150  
129/129 150/150  
208/230  
460  
187  
414  
518  
253  
42 239  
33.6 225  
17.3 114  
13.5 80.0  
7.5 25.0/25.0  
4.6 18.8  
—
2.3  
—
—
61  
63  
48  
50  
80  
80  
60  
60  
508 19.2 125  
633 13.8 80.0  
1
7.5  
7.5  
13.0  
10.0  
6.0  
—
575  
1.0  
0.5  
0.5  
0.5  
2.1  
—
4.8  
—
138/138 175/175  
143/143 150/175  
208/230  
460  
187.2 253 20.7 156 20.7 156 47.1 245  
10.0 28.0/28.0  
4.6 18.8  
—
2.3  
—
—
6
64  
66  
54  
56  
80  
80  
60  
70  
414  
508  
10  
75 10  
54 8.2  
75 19.6 125  
54 15.8 100  
10.0  
10.0  
14.6  
13.0  
—
4.8  
575  
517.5 632.5 8.2  
2.1  
LEGEND  
Full Load Amps  
EXAMPLE: Supply voltage is 460-3-60.  
FLA  
—
—
—
—
—
—
—
—
—
AB = 452 v  
BC = 464 v  
AC = 455 v  
HACR  
IFM  
Heating, Air Conditioning and Refrigeration  
Indoor (Evaporator) Fan Motor  
Locked Rotor Amps  
LRA  
MCA  
MOCP  
NEC  
OFM  
RLA  
Minimum Circuit Amps  
452 + 464 + 455  
Average Voltage =  
Maximum Overcurrent Protection  
National Electrical Code  
3
Outdoor (Condenser) Fan Motor  
Rated Load Amps  
1371  
3
=
*Fuse or HACR circuit breaker.  
=
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  
NOTES:  
1. In compliance with NEC requirements for multimotor and combination  
load equipment (refer to NEC Articles 430 and 440), the overcurrent pro-  
tective device for the unit shall be fuse or HACR breaker. Canadian units  
may be fuse or circuit breaker.  
= 1.53%  
This amount of phase imbalance is satisfactory as it is below the maximum  
allowable 2%.  
2. Unbalanced 3-Phase Supply Voltage  
IMPORTANT: If the supply voltage phase imbalance is more than 2%,  
contact your local electric utility company immediately.  
Never operate a motor where a phase imbalance in supply voltage is  
greater than 2%. Use the following formula to determine the percent  
voltage imbalance.  
% Voltage Imbalance  
max voltage deviation from average voltage  
= 100 x  
average voltage  
15  
Step 10 — Make Outdoor-Air Inlet Adjust-  
ments  
MANUAL OUTDOOR-AIR DAMPER — All units (except  
those equipped with a factory-installed economizer) have a  
manual outdoor-air damper to provide ventilation air.  
Damper can be preset to admit up to 25% outdoor air into  
return-air compartment. To adjust, loosen securing screws and  
move damper to desired setting, then retighten screws to secure  
damper (Fig. 18).  
Fig. 19 — Outdoor-Air Hood Component Location  
Fig. 18 — Standard 25% Outdoor-Air  
Section Details  
Step 11 — Install Outdoor-Air Hood  
IMPORTANT: If the unit is equipped with the optional  
EconoMi$erIV component, move the outdoor-air tempera-  
ture sensor prior to installing the outdoor-air hood. See the  
Optional EconoMi$erIV and EconoMi$er2 section for  
more information.  
Fig. 20 — Seal Strip Location  
The outdoor-air hood is common to 25% air ventilation,  
EconoMi$erIV and EconoMi$er2. If EconoMi$erIV or  
EconoMi$er2 is used, all electrical connections have been  
made and adjusted at the factory. Assemble and install hood in  
the field.  
BAFFLE  
NOTE: The hood top panel, upper and lower filter retainers,  
hood drain pan, baffle (sizes 025 and 028), and filter support  
bracket are secured opposite the condenser end of the unit. The  
screens, hood side panels, remaining section of filter support  
bracket, seal strip, and hardware are in a package located  
inside the return-air filter access panel (Fig. 19).  
LOWER FILTER  
RETAINER  
FILTER SUPPORT  
BRACKET  
1. Attach seal strip to upper filter retainer. See Fig. 20.  
2. Assemble hood top panel, side panels, upper filter retain-  
er, and drain pan (see Fig. 21).  
3. Secure lower filter retainer and support bracket to unit.  
See Fig. 21. Leave screws loose on 025 and 028 units.  
HOOD SIDE  
4. Slide baffle (sizes 025 and 028) behind lower filter retain-  
er and tighten screws.  
5. Loosen sheet metal screws for top panel of base unit  
located above outdoor-air inlet opening, and remove  
screws for hood side panels located on the sides of the  
outdoor-air inlet opening.  
PANELS (2)  
HOOD TOP  
PANEL  
BAFFLE  
(025 AND  
028 ONLY)  
6. Match notches in hood top panel to unit top panel screws.  
Insert hood flange between top panel flange and unit.  
Tighten screws.  
7. Hold hood side panel flanges flat against unit, and install  
screws removed in Step 5.  
LOWER  
FILTER  
RETAINER  
FILTER SUPPORT  
BRACKET  
8. Insert outdoor-air inlet screens and spacer in channel  
created by lower filter retainer and filter support bracket.  
HOOD DRAIN PAN  
UPPER FILTER RETAINER  
Fig. 21 — Outdoor-Air Hood Details  
16  
Accessory 0° F Low Ambient Kit — Install the accessory 0° F  
Step 12 — Install All Accessories — After all the  
factory-installed options have been adjusted, install all field-  
installed accessories. Refer to the accessory installation  
instructions included with each accessory.  
low ambient kit per instruction supplied with accessory.  
Sensor Assembly — Install the sensor assembly in the location  
shown in Fig. 23.  
MOTORMASTER®  
I
CONTROL INSTALLATION  
Motor Mount — To ensure proper fan height, replace the exist-  
ing motor mount with the new motor mount provided with  
accessory.  
Transformer (460 and 575-v Units Only) — On 460 and 575-v  
units, a transformer is required. The transformer is provided  
with the accessory and must be field-installed.  
Motormaster I Control — Recommended mounting location is  
on the inside of the panel to the left of the control box. The  
control should be mounted on the inside of the panel, verti-  
cally, with leads protruding from bottom of extrusion.  
(48TM016,020, and 028)  
Install Field-Fabricated Wind Baffles — Wind baffles must  
be field-fabricated for all units to ensure proper cooling cycle  
operation at low ambient temperatures. See Fig. 22 for baffle  
details. Use 20-gage, galvanized sheet metal, or similar  
corrosion-resistant metal for baffles. Use field-supplied screws  
to attach baffles to unit. Screws should be 1/4-in. diameter and  
5/8-in. long. Drill required screw holes for mounting baffles.  
To avoid damage to the refrigerant coils and electrical com-  
ponents, use recommended screw sizes only. Use care  
when drilling holes.  
Install Motormaster I Controls — Only one Motormaster I  
control is required for 48TM016 and 020 units. The 48TM028  
requires 2 Motormaster I controls — one for circuit 1 and  
one for circuit 2. The Motormaster I control must be used in  
conjunction with the accessory 0° F low ambient kit  
(purchased separately). The Motormaster I device controls  
outdoor fan no. 1 (and 4 on size 028 units) while outdoor fans  
no. 2 and 3 (and 5 and 6 on 028 units) are sequenced off by the  
Accessory 0° F Low Ambient Kit.  
SENSOR  
LOCATION  
SENSOR  
LOCATION  
SENSOR  
LOCATION  
HAIRPIN END  
48TM016  
HAIRPIN END  
48TM028  
(Circuits 1 and 2)  
HAIRPIN END  
48TM020  
NOTE: All sensors are located on the eighth hairpin up from the  
bottom.  
Fig. 23 — Motormaster® I Sensor Locations  
NOTE: Dimensions in ( ) are in mm.  
Fig. 22 — Wind Baffle Details  
17  
MOTORMASTER®  
(48TM025 Only)  
V
CONTROL INSTALLATION  
FROM FUSE BLOCK  
Install Field-Fabricated Wind Baffles — Wind baffles must  
be field-fabricated for all units to ensure proper cooling cycle  
operation at low ambient temperatures. See Fig. 22 for baffle  
details. Use 20-gage, galvanized sheet metal, or similar  
corrosion-resistant metal for baffles. Use field-supplied screws  
to attach baffles to unit. Screws should be 1/4-in. diameter and  
5/8-in. long. Drill required screw holes for mounting baffles.  
To avoid damage to the refrigerant coils and electrical com-  
ponents, use recommended screw sizes only. Use care  
when drilling holes.  
B
13B  
12 13A  
13C  
2
2 56  
Install Motormaster V Controls — The Motormaster V  
(MMV) control is a motor speed control device which adjusts  
condenser fan motor speed in response to declining liquid  
refrigerant pressure. A properly applied Motormaster V control  
extends the operating range of air-conditioning systems and  
permits operation at lower outdoor ambient temperatures.  
TO PRESSURE  
TRANSDUCER  
1
2
3
The minimum ambient temperatures at which the unit will  
operate are:  
TO MOTOR(S)  
TEMPERATURE OPERATING LIMITS — F° (C°)  
Fig. 24 — Motormaster® V Control  
Standard  
Unit  
Unit with  
Unit with  
MMV Control  
Low Ambient Kit  
40 (4)  
25 (–4)  
–20 (–29)  
Table 6 — Motormaster V Control Package Usage  
To operate down to the ambient temperatures listed,  
Motormaster V controls (Fig. 24) must be added. Field-  
fabricated and installed wind baffles are also required for all units  
(see Fig. 22). The Motormaster V control permits operation of  
the unit to an ambient temperature of –20 F (–29 C). The control  
regulates the speed of 3-phase fan motors that are compatible  
with the control. These motors are factory installed.  
UNIT  
VOLTAGE  
ITEM DESCRIPTION  
208/230  
CRLOWAMB015A00  
48TM016-028  
460  
575  
CRLOWAMB016A00  
CRLOWAMB017A00  
Table 7 — Applicable Voltages and Motors  
See Table 6 for the Motormaster V control accessory  
package usage. Table 7 shows applicable voltages and motors.  
Replacement of fan motor IS NOT REQUIRED ON  
CURRENT PRODUCTION UNITS since the control is  
compatible with the factory-installed fan motors. Only field  
wiring control is required.  
VOLTAGE  
208/230-3-60  
460-3-60  
COMPATIBLE MOTOR  
HD52AK654  
HD52AK654  
HD52GE576  
575-3-60  
Install the Motormaster V control per instructions supplied  
with accessory.  
18  
into the fan section, down along the back side of the fan, and  
along the fan deck over to the supply-air opening.  
Step 13 — Adjust Factory-Installed Options  
PREMIERLINK™ CONTROL — The PremierLink control-  
ler is available as a special order from the factory and is  
compatible with the Carrier Comfort Network® (CCN) sys-  
tem. This control is designed to allow users the access and abil-  
ity to change factory-defined settings, thus expanding the func-  
tion of the standard unit control board. Carrier’s diagnostic  
standard tier display tools such as Navigator™ device or  
Scrolling Marquee can be used with the PremierLink  
controller.  
The PremierLink controller (see Fig. 25) requires the use of  
a Carrier electronic thermostat or a CCN connection for time  
broadcast to initiate its internal timeclock. This is necessary for  
broadcast of time of day functions (occupied/unoccupied). No  
sensors are supplied with the field-mounted PremierLink  
control. The factory-installed PremierLink control includes  
only the supply-air temperature (SAT) sensor and the outdoor  
air temperature (OAT) sensor as standard. An indoor air quality  
(CO2) sensor can be added as an option. Refer to Table 8 for  
sensor usage. Refer to Fig. 26 for PremierLink controller  
wiring. The PremierLink control may be mounted in the  
control panel or an area below the control panel.  
The SAT probe is wire-tied to the supply-air opening (on the  
horizontal opening end) in its shipping position. Remove the  
sensor for installation. Re-position the sensor in the flange of  
the supply-air opening or in the supply air duct (as required by  
local codes). Drill or punch a 1/2-in. hole in the flange or duct.  
Use two field-supplied, self-drilling screws to secure the sensor  
probe in a horizontal orientation.  
NOTE: The sensor must be mounted in the discharge airstream  
downstream of the cooling coil and any heating devices. Be  
sure the probe tip does not come in contact with any of the unit  
or heat surfaces.  
Outdoor Air Temperature (OAT) Sensor — When the unit is  
supplied with a factory-mounted PremierLink control, the  
outdoor-air temperature sensor (OAT) is factory-supplied and  
wired.  
Install the Indoor Air Quality (CO2) Sensor — Mount the  
optional indoor air quality (CO2) sensor according to manufac-  
turer specifications.  
A separate field-supplied transformer must be used to  
power the CO2 sensor.  
Wire the CO2 sensor to the COM and IAQI terminals of J5 on  
the PremierLink controller. Refer to the PremierLink Installa-  
tion, Start-up, and Configuration Instructions for detailed wiring  
and configuration information.  
NOTE: PremierLink controller version 1.3 and later is shipped  
in Sensor mode. If used with a thermostat, the PremierLink  
controller must be configured to Thermostat mode.  
Install the Supply Air Temperature (SAT) Sensor — When  
the unit is supplied with a factory-mounted PremierLink con-  
trol, the supply-air temperature (SAT) sensor (33ZCSENSAT)  
is factory-supplied and wired. The wiring is routed from the  
PremierLink control over the control box, through a grommet,  
Fig. 25 — PremierLink Controller  
19  
DISCRETE  
J4  
RED  
WHT  
BLK  
J6  
ANALO G  
J5  
0-20mA IN  
J4  
DISCRETE  
20  
Table 8 — PremierLink™ Sensor Usage  
OUTDOOR AIR  
TEMPERATURE SENSOR  
RETURN AIR  
TEMPERATURE SENSOR  
OUTDOOR AIR  
ENTHALPY SENSOR  
RETURN AIR  
ENTHALPY SENSOR  
APPLICATION  
Differential Dry Bulb  
Temperature with  
PremierLink*  
Required —  
33ZCT55SPT  
or Equivalent  
Included —  
HH79NZ039  
—
—
—
(PremierLink  
requires 4-20 mA  
Actuator)  
Single Enthalpy with  
PremierLink*  
Required —  
33CSENTHSW  
(HH57ZC003)  
or  
Included —  
Not Used  
(PremierLink  
—
—
requires 4-20 mA  
Actuator)  
HH57AC077  
Differential Enthalpy  
with PremierLink*  
(PremierLink  
requires 4-20 mA  
Actuator)  
Required —  
33CSENTHSW  
(HH57ZC003)  
or  
Required —  
33CSENTSEN  
or  
Included —  
Not Used  
HH57AC078  
HH57AC077  
*PremierLink control requires supply air temperature sensor 33ZCSENSAT and  
outdoor air temperature sensor HH79NZ039 — Included with factory-installed PremierLink control;  
field-supplied and field-installed with field-installed PremierLink control.  
NOTES:  
1. CO2 Sensors (Optional):  
33ZCSENCO2 — Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.  
33ZCASPCO2 — Aspirator box used for duct-mounted CO2 room sensor.  
33ZCT55CO2 — Space temperature and CO2 room sensor with override.  
33ZCT56CO2 — Space temperature and CO2 room sensor with override and setpoint.  
2. All units include the following standard sensors:  
Outdoor-air sensor — 50HJ540569 — Opens at 67 F, closes at 52 F, not adjustable.  
Mixed-air sensor — HH97AZ001 — (PremierLink control requires supply air temperature sensor 33ZCSENSAT  
and outdoor air temperature sensor HH79NZ039)  
Compressor lockout sensor — 50HJ540570 — Opens at 35 F, closes at 50 F.  
ENTHALPY SWITCH/RECEIVER — The accessory en-  
thalpy switch/receiver (33CSENTHSW) senses temperature  
and humidity of the air surrounding the device and calculates  
the enthalpy when used without an enthalpy sensor. The relay is  
energized when enthalpy is high and deenergized when  
enthalpy is low (based on ASHRAE [American Society of  
Heating, Refrigeration and Air Conditioning Engineers] 90.1  
criteria). If an accessory enthalpy sensor (33CSENTSEN) is  
attached to the return air sensor input, then differential enthalpy  
is calculated. The relay is energized when the enthalpy detected  
by the return air enthalpy sensor is less than the enthalpy at the  
enthalpy switch/receiver. The relay is deenergized when the  
enthalpy detected by the return air enthalpy sensor is greater  
than the enthalpy at the enthalpy switch/receiver (differential  
enthalpy control). See Fig. 27 and 28.  
OUTDOOR ENTHALPY CONTROL (Fig. 29) — Out-  
door enthalpy control requires only an enthalpy switch/  
receiver (33CSENTHSW). The enthalpy switch/receiver is  
mounted in the outdoor air inlet and calculates outdoor air  
enthalpy. The enthalpy switch/receiver energizes the relay  
output when the outdoor enthalpy is above 28 BTU/lb OR dry  
bulb temperature is above 75 F and is deenergized when  
the outdoor enthalpy is below 27 BTU/lb AND dry bulb  
temperature is below 74.5 F. The relay output is wired to the  
unit economizer which will open or close depending on the  
output of the switch.  
intake). The enthalpy switch/receiver is not a NEMA 4  
(National Electrical Manufacturers Association) enclosure and  
should be mounted in a location that is not exposed to outdoor  
elements such as rain or snow. Use two field-supplied no. 8 x  
3/4-in. TEK screws. Insert the screws through the holes in the  
sides of the enthalpy switch/receiver.  
Wiring — Carrier recommends the use of 18 to 22 AWG  
(American Wire Gage) twisted pair or shielded cable for all  
wiring. All connections must be made with 1/4-in. female spade  
connectors.  
A 24-vac transformer is required to power the enthalpy  
switch/receiver; as shown in Fig. 29, the PremierLink™ board  
provides 24 vac. Connect the GND and 24 VAC terminals on  
the enthalpy switch/receiver to the terminals on the transform-  
er. On some applications, the power from the economizer  
harness can be used to power the enthalpy switch/receiver. To  
power the enthalpy switch/receiver from the economizer  
harness, connect power of the enthalpy switch/receiver to the  
red and brown wires (1 and 4) on the economizer harness.  
For connection to rooftop units with PremierLink™ control,  
connect the LOW Enthalpy terminal on the enthalpy switch/  
receiver to J4 — pin 2 of the PremierLink control on the  
HVAC unit. The switch can be powered through the Premier-  
Link control board if desired. Wire the 24 VAC terminal on the  
enthalpy switch/receiver to J4 — pin 1 on the PremierLink  
control. Wire the GND terminal on the enthalpy switch/  
receiver to J1 — pin 2 on the PremierLink control. The HI  
Enthalpy terminal is not used. See Fig. 29.  
NOTE: The enthalpy calculation is done using an average  
altitude of 1000 ft above sea level.  
Mounting — Mount the enthalpy switch/receiver in a location  
where the outdoor air can be sampled (such as the outdoor air  
21  
Fig. 27 — Enthalpy Switch/Receiver Dimensions  
(33CSENTHSW)  
Fig. 28 — Enthalpy Sensor Dimensions  
(33CSENTSEN)  
*Used with Differential Enthalpy Control only.  
Fig. 29 — Typical Wiring Schematic — Carrier Rooftop Unit with PremierLink™ Controls  
22  
DIFFERENTIAL ENTHALPY CONTROL (Fig. 30) —  
Differential enthalpy control requires both an enthalpy switch/  
receiver (33CSENTHSW) and an enthalpy sensor  
(33CSENTSEN). The enthalpy switch/receiver is mounted in  
the outdoor air inlet and calculates outdoor air enthalpy. The  
enthalpy sensor is mounted in the return airstream and calcu-  
lates the enthalpy of the indoor air.  
The enthalpy switch/receiver energizes the HI Enthalpy  
relay output when the outdoor enthalpy is greater than the  
indoor enthalpy. The LOW Enthalpy terminal is energized  
when the outdoor enthalpy is lower than the indoor enthalpy.  
The relay output is wired to the unit economizer which will  
open or close depending on the output of the switch.  
the transformer. On some applications, the power from the  
economizer harness can be used to power the enthalpy switch/  
receiver. To power the enthalpy switch/receiver from the econ-  
omizer harness, connect power of the enthalpy switch/receiver  
to the red and brown wires (1 and 4) on the economizer  
harness.  
Connect the LOW Enthalpy terminal on the enthalpy  
switch/receiver to J4 — pin 2 of the PremierLink control on the  
HVAC unit. The switch can be powered through the Premier-  
Link control board if desired. Wire the 24VAC terminal on the  
enthalpy switch/receiver to J4 — pin 1 on the PremierLink  
control. Wire the GND terminal on the enthalpy switch/  
receiver to J1 — pin 2 on the PremierLink control. The HI  
Enthalpy terminal is not used. See Fig. 29.  
Connect the 4-20 mA IN terminal on the enthalpy switch/  
receiver to the 4-20 mA OUT terminal on the return air  
enthalpy sensor. Connect the 24-36 VDC OUT terminal on the  
enthalpy switch/receiver to the 24-36 VDC IN terminal on the  
return air enthalpy sensor. See Fig. 30.  
Enthalpy Switch/Receiver Jumper Settings — There are two  
jumpers. One jumper determines the mode of the enthalpy  
switch/receiver. The other jumper is not used. To access the  
jumpers, remove the 4 screws holding the cover on the  
enthalpy switch/receiver and then remove the cover. The  
factory settings for the jumpers are M1 and OFF.  
NOTE: The enthalpy calculation is done using an average  
altitude of 1000 ft above sea level.  
Mounting — Mount the enthalpy switch/receiver in a location  
where the outdoor air can be sampled (such as the outdoor air  
intake). The enthalpy switch/receiver is not a NEMA 4 enclo-  
sure and should be mounted in a location that is not exposed to  
outdoor elements such as rain, snow, or direct sunlight. Use  
two field-supplied no. 8 x 3/4-in. TEK screws. Insert the screws  
through the holes in the sides of the enthalpy switch/receiver.  
Mount the enthalpy sensor in a location where the indoor air  
can be sampled (such as the return air duct). The enthalpy  
sensor is not a NEMA 4 enclosure and should be mounted in a  
location that is not exposed to outdoor elements such as rain or  
snow. Use two field-supplied no. 8 x 3/4-in. TEK screws. Insert  
the screws through the holes in the sides of the enthalpy sensor.  
The mode jumper should be set to M2 for differential  
enthalpy control. The factory test jumper should remain on  
OFF or the enthalpy switch/receiver will not calculate enthalpy.  
Wiring — Carrier recommends the use of 18 to 22 AWG  
twisted pair or shielded cable for all wiring. All connections  
must be made with 1/4-in. female spade connectors.  
The PremierLink™ board provides 24-vac to power the  
enthalpy switch/receiver. Connect the GND and 24 VAC  
terminals on the enthalpy switch/receiver to the terminals on  
Enthalpy Sensor Jumper Settings — There are two jumpers.  
One jumper determines the mode of the enthalpy sensor. The  
other jumper is not used. To access the jumpers, remove the  
4 screws holding the cover on the enthalpy sensor and then  
remove the cover. The factory settings for the jumpers are M3  
and OFF.  
120 VAC  
LINE VOLTAGE  
24 VAC  
SECONDARY  
24 VAC OUTPUT FROM N/C CONTACT WHEN THE  
OUTDOOR ENTHALPY IS LESS THAN THE  
ORN  
INDOOR ENTHALPY  
(ENABLE ECONOMIZER)  
24 VAC OUTPUT FROM N/O CONTACT WHEN THE  
INDOOR ENTHALPY IS GREATER THAN THE  
OUTDOOR ENTHALPY  
24-36  
VDC  
OUT  
24-36 4-20  
VDC mA  
IN OUT  
HI  
4-20  
mA  
IN  
LOW GND 24  
ENTHALPY  
VAC  
33CSENTHSW  
33CSENTSEN  
JUMPER SETTINGS FOR 33CSENTHSW  
JUMPER SETTINGS FOR 33CSENTSEN  
LEGEND  
N/C  
N/O  
—
—
Normally Closed  
Normally Open  
Fig. 30 — Differential Enthalpy Control Wiring  
23  
The mode jumper should be set to M3 for 4 to 20 mA  
output. The factory test jumper should remain on OFF or the  
enthalpy sensor will not calculate enthalpy.  
ENTHALPY SENSORS AND CONTROL — The enthalpy  
control (HH57AC077) is supplied as a field-installed accessory  
to be used with the EconoMi$er2 damper control option. The  
outdoor air enthalpy sensor is part of the enthalpy control. The  
separate field-installed accessory return air enthalpy sensor  
(HH57AC078) is required for differential enthalpy control.  
ENTHALPY CONTROLLER  
(OUTDOOR  
AIR  
S
RED  
BRN  
+
ENTHALPY  
SENSOR)  
B
TR  
SO  
TR1  
BLK  
C
D
A
RED  
+
S
(RETURN AIR  
ENTHALPY  
SENSOR)  
+
3
1
SR  
2
+
GRAY/ORN  
GRAY/RED  
WIRE HARNESS  
IN UNIT  
LED  
NOTE: The enthalpy control must be set to the “D” setting for  
differential enthalpy control to work properly.  
NOTES:  
The enthalpy control receives the indoor and return  
enthalpy from the outdoor and return air enthalpy sensors and  
provides a dry contact switch input to the PremierLink™  
controller. Locate the controller in place of an existing econo-  
mizer controller or near the actuator. The mounting plate may  
not be needed if existing bracket is used.  
1. Remove factory-installed jumper across SR and + before con-  
necting wires from return air sensor.  
2. Switches shown in high outdoor air enthalpy state. Terminals 2  
and 3 close on low outdoor air enthalpy relative to indoor air  
enthalpy.  
3. Remove sensor mounted on back of control and locate in out-  
side airstream.  
A closed contact indicates that outside air is preferred to the  
return air. An open contact indicates that the economizer  
should remain at minimum position.  
Fig. 31 — Outdoor and Return Air Sensor Wiring  
Connections for Differential Enthalpy Control  
Outdoor Air Enthalpy Sensor/Enthalpy Controller  
(HH57AC077) — To wire the outdoor air enthalpy sensor,  
perform the following (see Fig. 31 and 32):  
NOTE: The outdoor air sensor can be removed from the back  
of the enthalpy controller and mounted remotely.  
1. Use a 4-conductor, 18 or 20 AWG cable to connect the  
enthalpy control to the PremierLink controller and power  
transformer.  
BRACKET  
HH57AC077  
ENTHALPY  
CONTROL AND  
OUTDOOR AIR  
ENTHALPY SENSOR  
2. Connect the following 4 wires from the wire harness  
located in rooftop unit to the enthalpy controller:  
a. Connect the BRN wire to the 24 vac terminal (TR1)  
on enthalpy control and to pin 1 on 12-pin harness.  
b. Connect the RED wire to the 24 vac GND terminal  
(TR) on enthalpy sensor and to pin 4 on 12-pin  
harness.  
c. Connect the GRAY/ORN wire to J4-2 on Premier-  
Link controller and to terminal (3) on enthalpy  
sensor.  
HH57AC078 ENTHALPY  
SENSOR (USED WITH  
ENTHALPY CONTROL  
FOR DIFFERENTIAL  
C7400A1004  
ENTHALPY OPERATION)  
+
d. Connect the GRAY/RED wire to J4-1 on Premier-  
Link controller and to terminal (2) on enthalpy sensor.  
NOTE: If installing in a Carrier rooftop, use the two gray wires  
provided from the control section to the economizer to connect  
PremierLink controller to terminals 2 and 3 on enthalpy sensor.  
MOUNTING PLATE  
Return Air Enthalpy Sensor — Mount the return-air enthalpy  
sensor (HH57AC078) in the return-air duct. The return air  
sensor is wired to the enthalpy controller (HH57AC077). The  
outdoor enthalpy changeover set point is set at the controller.  
To wire the return air enthalpy sensor, perform the follow-  
ing (see Fig. 31):  
Fig. 32 — Differential Enthalpy Control,  
Sensor and Mounting Plate (33AMKITENT006)  
1. Use a 2-conductor, 18 or 20 AWG, twisted pair cable to  
connect the return air enthalpy sensor to the enthalpy  
controller.  
2. At the enthalpy control remove the factory-installed  
resistor from the (SR) and (+) terminals.  
3. Connect the field-supplied RED wire to (+) spade  
connector on the return air enthalpy sensor and the (SR+)  
terminal on the enthalpy controller. Connect the BLK  
wire to (S) spade connector on the return air enthalpy  
sensor and the (SR) terminal on the enthalpy controller.  
To complete installation of the optional EconoMi$erIV, per-  
form the following procedure.  
1. Remove the EconoMi$erIV hood. Refer to Step 11 — In-  
stall Outdoor-Air Hood on page 16 for information on  
removing and installing the outdoor-air hood.  
2. Relocate outdoor air temperature sensor from shipping  
position to operation position on EconoMi$erIV. See  
Fig. 33.  
OPTIONAL ECONOMI$ERIV AND ECONOMI$ER2 —  
See Fig. 33 and 34 for EconoMi$erIV component locations.  
See Fig. 35 for EconoMi$er2 component locations.  
NOTE: These instructions are for installing the optional  
EconoMi$erIV and EconoMi$er2 only. Refer to the accessory  
EconoMi$erIV or EconoMi$er2 installation instructions when  
field installing an EconoMi$erIV or EconoMi$er2 accessory.  
IMPORTANT: Failure to relocate the sensor will result in  
the EconoMi$erIV not operating properly.  
3. Reinstall economizer hood.  
4. Install all EconoMi$erIV accessories. EconoMi$erIV  
wiring is shown in Fig. 36. EconoMi$er2 wiring is shown  
in Fig. 37.  
24  
Outdoor air leakage is shown in Table 9. Return air pressure  
drop is shown in Table 10.  
ECONOMI$ER2  
FRAME  
TOP  
SCREWS  
Table 9 — Outdoor Air Damper Leakage  
DAMPER STATIC PRESSURE (in. wg)  
SCREWS  
0.2  
0.4  
0.6  
0.8  
1.0  
1.2  
LEAKAGE (cfm)  
35  
53  
65  
75  
90  
102  
Table 10 — Return Air Pressure Drop (in. wg)  
CFM  
4500 5000 5400 6000 7200 7500 9000 10,000 11,250  
0.040 0.050 0.060 0.070 0.090 0.100 0.110 0.120 0.140  
Fig. 35 — EconoMi$er2 Component Locations  
ECONOMI$ERIV STANDARD SENSORS  
OUTDOOR AIR  
TEMPERATURE SENSOR  
(INSTALLED OPERATION  
POSITION)  
Outdoor Air Temperature (OAT) Sensor — The outdoor air  
temperature sensor (HH57AC074) is a 10 to 20 mA device  
used to measure the outdoor-air temperature. The outdoor air  
temperature is used to determine when the EconoMi$erIV can  
be used for free cooling. The sensor must be field-relocated.  
See Fig. 33. The operating range of temperature measurement  
is 40 to 100 F.  
FRAME  
TOP  
ECONOMI$ERIV  
SCREWS  
SCREWS  
Supply Air Temperature (SAT) Sensor — The supply air  
temperature sensor is a 3 K thermistor located at the inlet of the  
indoor fan. See Fig. 34. This sensor is factory installed. The op-  
erating range of temperature measurement is 0° to 158 F. See  
Table 11 for sensor temperature/resistance values.  
LOW TEMPERATURE  
COMPRESSOR  
LOCKOUT SWITCH  
The temperature sensor looks like an eyelet terminal with  
wires running to it. The sensor is located in the “crimp end”  
and is sealed from moisture.  
Fig. 33 — EconoMi$erIV Component Locations —  
End View  
Low Temperature Compressor Lockout Switch — The Econo-  
Mi$erIV is equipped with an ambient temperature lockout  
switch located in the outdoor airstream which is used to lockout  
the compressors below a 42 F ambient temperature. See Fig. 33.  
SUPPLY AIR  
TEMPERATURE SENSOR  
LOCATION  
Table 11 — Supply Air Sensor Temperature/  
Resistance Values  
TEMPERATURE (F)  
RESISTANCE (ohms)  
–58  
–40  
–22  
–4  
14  
32  
50  
68  
77  
86  
104  
122  
140  
158  
176  
185  
194  
212  
230  
248  
257  
266  
284  
302  
200,250  
100,680  
53,010  
29,091  
16,590  
9,795  
5,970  
3,747  
3,000  
2,416  
1,597  
1,080  
746  
ECONOMI$ERIV  
ACTUATOR  
CONTROLLER  
FLANGE  
AND SCREWS  
(HIDDEN)  
Fig. 34 — EconoMi$erIV Component Locations —  
Side View  
525  
376  
321  
274  
203  
153  
116  
102  
89  
70  
55  
25  
Potentiometer Default Settings:  
Power Exhaust Middle  
LEGEND  
NOTES:  
1. 620 ohm, 1 watt 5% resistor should be removed only when using differential  
DCV — Demand Controlled Ventilation  
IAQ — Indoor Air Quality  
Minimum Pos.  
DCV Max.  
DCV Set  
Fully Closed  
Middle  
enthalpy or dry bulb.  
2. If a separate field-supplied 24 v transformer is used for the IAQ sensor power  
supply, it cannot have the secondary of the transformer grounded.  
3. For field-installed remote minimum position POT, remove black wire jumper  
between P and P1 and set control minimum position POT to the minimum  
position.  
LALS— Low Temperature Compressor  
Lockout Switch  
Middle  
C Setting  
Enthalpy  
OAT — Outdoor-Air Temperature  
POT — Potentiometer  
Fig. 36 — EconoMi$erIV Wiring  
4
3
7
2
RED  
500 OHM  
RESISTOR  
8
6
5
PINK  
NOTE 1  
BLUE  
RUN  
OAT  
BLACK  
1
10  
11  
9
NOTE 2  
50HJ540573  
ACTUATOR  
ASSEMBLY  
WHITE  
DIRECT DRIVE  
ACTUATOR  
12  
ECONOMISER2 PLUG  
LEGEND  
OAT — Outdoor Air Temperature Sensor  
NOTES:  
1. Switch on actuator must be in run position for economizer to operate.  
2. 50HJ540573 actuator consists of the 50HJ540567 actuator and a harness with 500-ohm resistor.  
Fig. 37 — EconoMi$er2 Wiring  
26  
ECONOMI$ERIV CONTROL MODES  
IMPORTANT: The optional EconoMi$er2 does not include  
a controller. The EconoMi$er2 is operated by a 4 to 20 mA  
signal from an existing field-supplied controller (such as  
PremierLink™ control). See Fig. 37 for wiring information.  
Determine the EconoMi$erIV control mode before set up of  
the control. Some modes of operation may require different sen-  
sors. Refer to Table 12. The EconoMi$erIV is supplied from the  
factory with a supply air temperature sensor, a low temperature  
compressor lockout switch, and an outdoor air temperature sen-  
sor. This allows for operation of the EconoMi$erIV with out-  
door air dry bulb changeover control. Additional accessories  
can be added to allow for different types of changeover control  
and operation of the EconoMi$erIV and unit.  
Table 12 — EconoMi$erIV Sensor Usage  
ECONOMI$ERIV WITH OUTDOOR AIR  
Fig. 38 — EconoMi$erIV Controller Potentiometer  
and LED Locations  
DRY BULB SENSOR  
Accessories Required  
APPLICATION  
Outdoor Air  
Dry Bulb  
None. The outdoor air dry bulb sensor  
is factory installed.  
Differential  
Dry Bulb  
Single Enthalpy  
CRTEMPSN002A00*  
HH57AC078  
19  
LED ON  
18  
D
HH57AC078  
and  
17  
Differential  
Enthalpy  
LED ON  
LED OFF  
16  
15  
14  
CRENTDIF004A00*  
C
CO2 for DCV  
Control using a  
Wall-Mounted  
CO2 Sensor  
CO2 for DCV  
Control using a  
Duct-Mounted  
CO2 Sensor  
LED ON  
33ZCSENCO2  
LED OFF  
B
13  
12  
LED ON  
LED OFF  
33ZCSENCO2†  
A
11  
10  
9
and  
CRCBDIOX005A00††  
33ZCASPCO2**  
LED OFF  
85 90  
95  
*CRENTDIF004A00 and CRTEMPSN002A00 accessories are  
used on many different base units. As such, these kits may con-  
tain parts that will not be needed for installation.  
100  
50  
55 60  
70 75  
40 45  
65  
80  
DEGREES FAHRENHEIT  
†33ZCSENCO2 is an accessory CO2 sensor.  
Fig. 39 — Outside Air Temperature  
Changeover Set Points  
**33ZCASPCO2 is an accessory aspirator box required for duct-  
mounted applications.  
††CRCBDIOX005A00 is an accessory that contains both  
33ZCSENCO2 and 33ZCASPCO2 accessories.  
Outdoor Dry Bulb Changeover — The standard controller is  
shipped from the factory configured for outdoor dry bulb  
changeover control. The outdoor air and supply air temperature  
sensors are included as standard. For this control mode, the  
outdoor temperature is compared to an adjustable set point  
selected on the control. If the outdoor-air temperature is above  
the set point, the EconoMi$erIV will adjust the outdoor-air  
dampers to minimum position. If the outdoor-air temperature is  
below the set point, the position of the outdoor-air dampers will  
be controlled to provide free cooling using outdoor air. When  
in this mode, the LED next to the free cooling set point potenti-  
ometer will be on. The changeover temperature set point is  
controlled by the free cooling set point potentiometer located  
on the control. See Fig. 38. The scale on the potentiometer is A,  
B, C, and D. See Fig. 39 for the corresponding temperature  
changeover values.  
Differential Dry Bulb Control — For differential dry bulb  
control the standard outdoor dry bulb sensor is used in conjunc-  
tion with an additional accessory return air sensor (part number  
CRTEMPSN002A00). The accessory sensor must be mounted  
in the return airstream. See Fig. 40.  
In this mode of operation, the outdoor-air temperature is  
compared to the return-air temperature and the lower tempera-  
ture airstream is used for cooling. When using this mode of  
changeover control, turn the free cooling/enthalpy set point  
potentiometer fully clockwise to the D setting. See Fig. 38.  
RETURN AIR  
IAQ  
SENSOR  
TEMPERATURE  
OR ENTHALPY  
SENSOR  
Fig. 40 — Return Air Temperature or  
Enthalpy Sensor Mounting Location  
27  
Outdoor Enthalpy Changeover — For enthalpy control, ac-  
cessory enthalpy sensor (part number HH57AC078) is  
required. Replace the standard outdoor dry bulb temperature  
sensor with the accessory enthalpy sensor in the same mount-  
ing location. See Fig. 33. When the outdoor air enthalpy rises  
above the outdoor enthalpy changeover set point, the outdoor-  
air damper moves to its minimum position. The outdoor  
enthalpy changeover set point is set with the outdoor enthalpy  
set point potentiometer on the EconoMi$erIV controller. The  
set points are A, B, C, and D. See Fig. 41. The factory-installed  
620-ohm jumper must be in place across terminals SR and SR+  
on the EconoMi$erIV controller. See Fig. 33 and 42.  
Differential Enthalpy Control — For differential enthalpy  
control, the EconoMi$erIV controller uses two enthalpy sen-  
sors (HH57AC078 and CRENTDIF004A00), one in the out-  
side air and one in the return airstream or the EconoMi$erIV  
frame. The EconoMi$erIV controller compares the outdoor air  
enthalpy to the return air enthalpy to determine EconoMi$erIV  
use. The controller selects the lower enthalpy air (return or out-  
door) for cooling. For example, when the outdoor air has a low-  
er enthalpy than the return air and is below the set point, the  
EconoMi$erIV opens to bring in outdoor air for free cooling.  
enter the building. Make minimum position adjustments with  
at least 10° F temperature difference between the outdoor and  
return-air temperatures.  
To determine the minimum position setting, perform the  
following procedure:  
1. Calculate the appropriate mixed-air temperature using the  
following formula:  
OA  
100  
RA  
100  
(TO x  
) + (TR x  
) = TM  
TO = Outdoor-Air Temperature  
OA = Percent of Outdoor Air  
TR = Return-Air Temperature  
RA = Percent of Return Air  
TM = Mixed-Air Temperature  
As an example, if local codes require 10% outdoor air  
during occupied conditions, outdoor-air temperature is  
60 F, and return-air temperature is 75 F.  
(60 x .10) + (75 x .90) = 73.5 F  
2. Disconnect the supply-air sensor from terminals T and  
T1.  
3. Ensure that the factory-installed jumper is in place across  
terminals P and P1. If remote damper positioning is being  
used, make sure that the terminals are wired according to  
Fig. 36 and that the minimum position potentiometer is  
turned fully clockwise.  
Replace the standard outside air dry bulb temperature sen-  
sor with the accessory enthalpy sensor in the same mounting  
location. See Fig. 33. Mount the return air enthalpy sensor in  
the return airstream. See Fig. 40. The outdoor enthalpy  
changeover set point is set with the outdoor enthalpy set point  
potentiometer on the EconoMi$erIV controller. When using  
this mode of changeover control, turn the enthalpy set point  
potentiometer fully clockwise to the D setting.  
4. Connect 24 vac across terminals TR and TR1.  
5. Carefully adjust the minimum position potentiometer  
until the measured mixed-air temperature matches the  
calculated value.  
NOTE: Remove 620-ohm resistor if differential enthalpy sen-  
sor is installed.  
Indoor Air Quality (IAQ) Sensor Input — The IAQ input  
can be used for demand control ventilation control based on the  
level of CO2 measured in the space or return air duct.  
6. Reconnect the supply-air sensor to terminals T and T1.  
Remote control of the EconoMi$erIV damper is desirable  
when requiring additional temporary ventilation. If  
a
Mount the accessory IAQ sensor according to manufacturer  
specifications. The IAQ sensor should be wired to the AQ and  
AQ1 terminals of the controller. Adjust the DCV potentiome-  
ters to correspond to the DCV voltage output of the indoor air  
quality sensor at the user-determined set point. See Fig. 43.  
If a separate field-supplied transformer is used to power the  
IAQ sensor, the sensor must not be grounded or the  
EconoMi$erIV control board will be damaged.  
Exhaust Set Point Adjustment — The exhaust set point will  
determine when the exhaust fan runs based on damper position  
(if accessory power exhaust is installed). The set point is modi-  
fied with the Exhaust Fan Set Point (EXH SET) potentiometer.  
See Fig. 36. The set point represents the damper position above  
which the exhaust fan will be turned on. When there is a  
call for exhaust, the EconoMi$erIV controller provides a  
45 15 second delay before exhaust fan activation to allow the  
dampers to open. This delay allows the damper to reach the  
appropriate position to avoid unnecessary fan overload.  
Minimum Position Control — There is a minimum damper  
position potentiometer on the EconoMi$erIV controller. See  
Fig. 36. The minimum damper position maintains the mini-  
mum airflow into the building during the occupied period.  
field-supplied remote potentiometer (Honeywell part number  
S963B1128) is wired to the EconoMi$erIV controller, the min-  
imum position of the damper can be controlled from a remote  
location.  
To control the minimum damper position remotely, remove  
the factory-installed jumper on the P and P1 terminals on the  
EconoMi$erIV controller. Wire the field-supplied potentiome-  
ter to the P and P1 terminals on the EconoMi$erIV controller.  
See Fig. 40.  
Damper Movement — Damper movement from full open to  
full closed (or vice versa) takes 21/2 minutes.  
Thermostats — The EconoMi$erIV control works with con-  
ventional thermostats that have a Y1 (cool stage 1), Y2 (cool  
stage 2), W1 (heat stage 1), W2 (heat stage 2), and G (fan). The  
EconoMi$erIV control does not support space temperature  
sensors. Connections are made at the thermostat terminal con-  
nection board located in the main control box.  
Occupancy Control — The factory default configuration for  
the EconoMi$erIV control is occupied mode. Occupied status  
is provided by the black jumper from terminal TB2-9 to termi-  
nal TB2-10. When unoccupied mode is desired, install a field-  
supplied timeclock function in place of the jumper between  
terminals TB2-9 and TB2-10. See Fig. 36. When the timeclock  
contacts are closed, the EconoMi$erIV control will be in occu-  
pied mode. When the timeclock contacts are open (removing  
the 24-v signal from terminal N), the EconoMi$erIV will be in  
unoccupied mode.  
When using demand ventilation, the minimum damper po-  
sition represents the minimum ventilation position for VOC  
(volatile organic compound) ventilation requirements. The  
maximum demand ventilation position is used for fully occu-  
pied ventilation.  
When demand ventilation control is not being used, the  
minimum position potentiometer should be used to set the oc-  
cupied ventilation position. The maximum demand ventilation  
position should be turned fully clockwise.  
Adjust the minimum position potentiometer to allow the  
minimum amount of outdoor air, as required by local codes, to  
Demand Controlled Ventilation (DCV) — When using the  
EconoMi$erIV for demand controlled ventilation, there are  
some equipment selection criteria which should be considered.  
When selecting the heat capacity and cool capacity of the  
equipment, the maximum ventilation rate must be evaluated for  
design conditions. The maximum damper position must be cal-  
culated to provide the desired fresh air.  
28  
Typically the maximum ventilation rate will be about 5 to  
10% more than the typical cfm required per person, using  
normal outside air design criteria.  
A proportional anticipatory strategy should be taken with  
the following conditions: a zone with a large area, varied occu-  
pancy, and equipment that cannot exceed the required ventila-  
tion rate at design conditions. Exceeding the required ventila-  
tion rate means the equipment can condition air at a maximum  
ventilation rate that is greater than the required ventilation rate  
for maximum occupancy. A proportional-anticipatory strategy  
will cause the fresh air supplied to increase as the room CO2  
level increases even though the CO2 set point has not been  
reached. By the time the CO2 level reaches the set point, the  
damper will be at maximum ventilation and should maintain  
the set point.  
85  
90  
95 100 105 110  
(29) (32) (35) (38) (41) (43)  
CONTROL CONTROL POINT  
CURVE  
APPROX. °F (°C)  
AT 50% RH  
80  
(27)  
A
B
C
D
73 (23)  
70 (21)  
67 (19)  
63 (17)  
75  
(24)  
70  
(21)  
65  
(18)  
60  
(16)  
A
55  
(13)  
B
50  
(10)  
C
45  
(7)  
D
40  
(4)  
35  
(2)  
A
B
C
D
HIGH LIMIT  
CURVE  
35  
40  
45  
50  
55  
60  
65  
70  
75  
80  
85  
90  
95 100 105 110  
(2)  
(4) (7) (10) (13) (16) (18) (21) (24) (27) (29) (32) (35) (38) (41) (43)  
APPROXIMATE DRY BULB TEMPERATURE— °F (°C)  
Fig. 41 — Enthalpy Changeover Set Points  
TR1  
EXH  
Set  
TR  
N1  
N
CO SENSOR MAX RANGE SETTING  
2
2V  
10V  
6000  
5000  
4000  
3000  
2000  
1000  
0
EXH  
24  
Vac  
HOT  
24 Vac  
COM  
P1  
T1  
P
T
Min  
Pos  
_
+
Open  
800 ppm  
900 ppm  
1000 ppm  
1100 ppm  
DCV  
Max  
10V  
1
2
5
2V  
AQ1  
AQ  
SO+  
SO  
SR+  
SR  
DCV  
DCV  
Set  
4
3
2V  
10V  
Free  
Cool  
B
EF1  
EF  
C
D
2
3
4
5
6
7
8
A
DAMPER VOLTAGE FOR MAX VENTILATION RATE  
Fig. 42 — EconoMi$erIV Controller  
Fig. 43 — CO2 Sensor Maximum Range Setting  
29  
In order to have the CO2 sensor control the economizer  
damper in this manner, first determine the damper voltage out-  
put for minimum or base ventilation. Base ventilation is the  
ventilation required to remove contaminants during unoccu-  
pied periods. The following equation may be used to determine  
the percent of outside-air entering the building for a given  
damper position. For best results there should be at least a  
10 degree difference in outside and return-air temperatures.  
CO2 Sensor Configuration — The CO2 sensor has preset  
standard voltage settings that can be selected anytime after the  
sensor is powered up. See Table 13.  
Use setting 1 or 2 for Carrier equipment. See Table 13.  
1. Press Clear and Mode buttons. Hold at least 5 seconds  
until the sensor enters the Edit mode.  
2. Press Mode twice. The STDSET Menu will appear.  
3. Use the Up/Down button to select the preset number. See  
Table 13.  
4. Press Enter to lock in the selection.  
OA  
100  
RA  
100  
(TO x  
) + (TR x  
) = TM  
TO = Outdoor-Air Temperature  
OA = Percent of Outdoor Air  
TR = Return-Air Temperature  
RA = Percent of Return Air  
TM = Mixed-Air Temperature  
5. Press Mode to exit and resume normal operation.  
The custom settings of the CO2 sensor can be changed any-  
time after the sensor is energized. Follow the steps below to  
change the non-standard settings:  
1. Press Clear and Mode buttons. Hold at least 5 seconds  
until the sensor enters the Edit mode.  
Once base ventilation has been determined, set the mini-  
mum damper position potentiometer to the correct position.  
2. Press Mode twice. The STDSET Menu will appear.  
The same equation can be used to determine the occupied or  
maximum ventilation rate to the building. For example, an out-  
put of 3.6 volts to the actuator provides a base ventilation rate  
of 5% and an output of 6.7 volts provides the maximum venti-  
lation rate of 20% (or base plus 15 cfm per person). Use Fig. 43  
to determine the maximum setting of the CO2 sensor. For ex-  
ample, a 1100 ppm set point relates to a 15 cfm per person de-  
sign. Use the 1100 ppm curve on Fig. 43 to find the point when  
the CO2 sensor output will be 6.7 volts. Line up the point on the  
graph with the left side of the chart to determine that the range  
configuration for the CO2 sensor should be 1800 ppm. The  
EconoMi$erIV controller will output the 6.7 volts from the  
CO2 sensor to the actuator when the CO2 concentration in the  
space is at 1100 ppm. The DCV set point may be left at 2 volts  
since the CO2 sensor voltage will be ignored by the  
EconoMi$erIV controller until it rises above the 3.6 volt setting  
of the minimum position potentiometer.  
3. Use the Up/Down button to toggle to the NONSTD menu  
and press Enter.  
4. Use the Up/Down button to toggle through each of the  
nine variables, starting with Altitude, until the desired set-  
ting is reached.  
5. Press Mode to move through the variables.  
6. Press Enter to lock in the selection, then press Mode to  
continue to the next variable.  
Dehumidification of Fresh Air with DCV Control — Infor-  
mation from ASHRAE indicates that the largest humidity load  
on any zone is the fresh air introduced. For some applications,  
a field-installed energy recovery unit can be added to reduce  
the moisture content of the fresh air being brought into the  
building when the enthalpy is high. In most cases, the normal  
heating and cooling processes are more than adequate to re-  
move the humidity loads for most commercial applications.  
Once the fully occupied damper position has been deter-  
mined, set the maximum damper demand control ventilation  
potentiometer to this position. Do not set to the maximum posi-  
tion as this can result in over-ventilation to the space and poten-  
tial high-humidity levels.  
If normal rooftop heating and cooling operation is not ade-  
quate for the outdoor humidity level, an energy recovery unit  
and/or a dehumidification option should be considered.  
Table 13 — CO2 Sensor Standard Settings  
VENTILATION  
RATE  
(cfm/Person)  
CO2  
OPTIONAL  
RELAY  
ANALOG  
OUTPUT  
SETTING  
EQUIPMENT  
OUTPUT  
CONTROL RANGE RELAY SETPOINT HYSTERESIS  
(ppm)  
(ppm)  
(ppm)  
0-10V  
1
2
3
4
5
6
7
8
9
Proportional  
Proportional  
Exponential  
Proportional  
Proportional  
Exponential  
Exponential  
Proportional  
Proportional  
Any  
Any  
Any  
15  
0-2000  
1000  
50  
4-20 mA  
Interface with Standard  
Building Control System  
2-10V  
7-20 mA  
0-10V  
4-20 mA  
0-10V  
4-20 mA  
0-10V  
4-20 mA  
0-10V  
4-20 mA  
0-10V  
4-20 mA  
0-10V  
4-20 mA  
0-10V  
4-20 mA  
0-2000  
0-2000  
0-1100  
0- 900  
0-1100  
0- 900  
0-9999  
0-2000  
1000  
1100  
1100  
900  
50  
50  
50  
20  
50  
Economizer  
15  
1100  
900  
50  
20  
50  
Health & Safety  
—
5000  
700  
500  
50  
Parking/Air Intakes/  
Loading Docks  
—
LEGEND  
ppm — Parts Per Million  
30  
Step 14 — Install Humidistat for Optional  
MoistureMi$er™ Package — MoistureMi$er dehu-  
midification package operation can be controlled by field  
installation of a Carrier-approved humidistat. To install the  
humidistat perform the following procedure:  
1. Locate humidistat on a solid interior wall in the condi-  
tioned space. Location should be a well ventilated area  
to sense average humidity.  
2. Route thermostat cable or equivalent single leads of col-  
ored wire from Humidistat terminals through conduit in  
unit to the low voltage connection on the 2-pole terminal  
strip (TB3) as shown in Fig. 44 and Fig. 45. See Fig. 46  
for operational diagram.  
Fig. 45 — Typical MoistureMi$er Dehumidification  
Package Control Box  
MOISTUREMI$ER  
YEL  
BLK  
YEL  
TO CRANKCASE  
HEATER CIRCUITS  
BLK  
BLK  
RED  
RED  
BLK  
ORN  
BLK  
YEL  
ORN  
YEL  
TRAN1  
TRAN3  
24V  
24V  
BLK  
A
A
C
C
GRN-YEL  
GRN-YEL  
BLK  
LEGEND  
— Circuit Breaker  
CB  
LLSV1  
LLSV2  
S-LPS1  
S-LPS2  
LLSV — Liquid Line Solenoid Valve  
LPS — Low-Pressure Switch  
CB4  
TB3  
TB  
— Terminal Block  
TRAN — Transformer  
2
11  
3.2 AMPS  
1
BLK  
21  
FACTORY INSTALLED JUMPER  
(OR HUMIDISTAT IF USED)  
Fig. 44 — Typical MoistureMi$er Dehumidification Package  
Humidistat Wiring Schematic (460 V Unit Shown)  
31  
TXV — Thermostatic Expansion Valve  
Fig. 46 — MoistureMi$er™ Dehumidification Operation Diagram  
32  
CRANKCASE HEATER — Crankcase heater(s) is energized  
as long as there is power to the unit and the compressor is not  
operating.  
START-UP  
Use the following information and Start-Up Checklist on  
page CL-1 to check out unit PRIOR to start-up.  
IMPORTANT: Unit power must be on for 24 hours prior  
to start-up. Otherwise, damage to the compressor may  
result.  
Unit Preparation — Check that unit has been installed in  
accordance with these installation instructions and all applica-  
ble codes.  
COMPRESSOR MOUNTING — Compressors are internal-  
ly spring mounted. Do not loosen or remove compressor  
holddown bolts.  
REFRIGERANT SERVICE PORTS — Each refrigerant sys-  
tem has a total of 3 Schrader-type service gage ports. One port  
is located on the suction line, one on the compressor discharge  
line, and one on the liquid line. In addition Schrader-type  
valves are located underneath the low-pressure switches. Be  
sure that caps on the ports are tight.  
COMPRESSOR ROTATION — It is important to be certain  
the compressors are rotating in the proper direction. To deter-  
mine whether or not compressors are rotating in the proper  
direction:  
1. Connect service gages to suction and discharge  
pressure fittings.  
EVAPORATOR FAN — Fan belt and variable pulleys are  
factory-installed. See Tables 14-21 for fan performance data.  
Be sure that fans rotate in the proper direction. See Table 22 for  
air quantity limits. See Table 23 for static pressure information  
for accessories and options. See Table 24 for fan rpm at various  
motor pulley settings. See Tables 25 and 26 for evaporator fan  
motor data. To alter fan performance, see Evaporator Fan  
Performance Adjustment section on page 44.  
NOTE: A 31/2-in. bolt and threaded plate are included in the  
installer’s packet. They can be added to the motor support  
channel below the motor mounting plate to aid in raising the  
fan motor.  
CONDENSER-FANS AND MOTORS — Condenser fans  
and motors are factory set. Refer to Condenser-Fan Adjustment  
section on page 45 as required. Be sure that fans rotate in the  
proper direction.  
2. Energize the compressor.  
RETURN-AIR FILTERS — Check that correct filters are  
installed in filter tracks (see Table 1). Do not operate unit  
without return-air filters.  
OUTDOOR-AIR INLET SCREENS — Outdoor-air inlet  
screens must be in place before operating unit.  
GAS HEAT — Verify gas pressures before turning on heat as  
follows:  
1. Turn off manual gas stop.  
2. Connect pressure gage to supply gas pressure tap (see  
Fig. 14).  
3. Connect pressure gage to manifold pressure tap on gas  
valve.  
4. Turn on manual gas stop and set thermostat to HEAT  
position. After the unit has run for several minutes, verify  
that incoming pressure is 5.5 in. wg or greater, and that  
the manifold pressure is 3.3 in. wg. If manifold pressure  
must be adjusted, refer to Gas Valve Adjustment section  
on page 46.  
5. After unit has been in operation for 5 minutes, check  
temperature rise across the heat exchangers. See unit  
informative plate for correct rise limits of the heat  
supplied. Air quantities may need to be adjusted to bring  
the actual rise to within the allowable limits.  
3. The suction pressure should drop and the discharge  
pressure should rise, as is normal on any start-up.  
If the suction pressure does not drop and the discharge  
pressure does not rise to normal levels:  
1. Note that the evaporator fan is probably also rotating  
in the wrong direction.  
2. Turn off power to the unit.  
3. Reverse any two of the incoming power leads.  
4. Turn on power to the compressor.  
The suction and discharge pressure levels should now move  
to their normal start-up levels.  
NOTE: When compressors are rotating in the wrong direction,  
the unit will have increased noise levels and will not provide  
heating and cooling.  
After a few minutes of reverse operation, the scroll  
compressor internal overload protection will open, which will  
activate the unit’s lockout and requires a manual reset. Reset is  
accomplished by turning the thermostat on and off.  
INTERNAL WIRING — Check all electrical connections in  
unit control boxes; tighten as required.  
GAS PIPING — Check gas piping for leaks.  
Disconnect gas piping from unit when leak  
testing at pressure greater than 1/2 psig. Pres-  
1
sures greater than /2 psig will cause gas  
valve damage resulting in hazardous condi-  
tion. If gas valve is subjected to pressure  
1
greater than /2 psig, it must be replaced  
before use. When pressure testing field-  
1
supplied gas piping at pressures of /2 psig  
or less, a unit connected to such piping must  
be isolated by manually closing the gas  
valve.  
33  
Table 14 — Fan Performance — 48TMD016 (Low Heat Units)*  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(cfm)  
0.2  
Watts  
0.4  
0.6  
0.8  
1.0  
Rpm  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
4500  
4800  
5100  
5700  
6000  
6300  
6600  
6900  
7200  
7500  
753  
747  
741  
810  
844  
879  
915  
950  
986  
1022  
1307  
1384  
1465  
1911  
2164  
2439  
2737  
3057  
3401  
3770  
1.53  
1.62  
1.72  
2.24  
2.54  
2.86  
3.21  
3.59  
3.99  
4.42  
761  
790  
1330  
1515  
1718  
2182  
2444  
2729  
3035  
3364  
3717  
4095  
1.56  
1.78  
2.01  
2.56  
2.87  
3.20  
3.56  
3.95  
4.36  
4.80  
840  
866  
1572  
1765  
1977  
2459  
2730  
3023  
3338  
3675  
4037  
4423  
1.84  
2.07  
2.32  
2.88  
3.20  
3.55  
3.91  
4.31  
4.74  
5.19  
912  
936  
1822  
2023  
2243  
2741  
3021  
3322  
3645  
3991  
4361  
4755  
2.14  
2.37  
2.63  
3.21  
3.54  
3.90  
4.28  
4.68  
5.11  
5.58  
980  
1002  
1025  
1075  
1100  
1127  
1155  
1183  
1211  
1241  
2080  
2289  
2516  
3029  
3317  
3626  
3957  
4311  
4689  
5091  
2.44  
2.68  
2.95  
3.55  
3.89  
4.25  
4.64  
5.06  
5.50  
5.97  
820  
893  
961  
882  
950  
980  
1010  
1041  
1072  
1104  
1136  
1014  
1042  
1070  
1099  
1129  
1159  
1189  
914  
947  
980  
1013  
1047  
1081  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(cfm)  
1.2  
Watts  
1.4  
1.8  
2.0  
Watts  
Rpm  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Bhp  
4500  
4800  
5100  
5700  
6000  
6300  
6600  
6900  
7200  
7500  
1044  
1065  
1086  
1132  
1157  
1182  
1208  
1235  
1262  
—
2345  
2561  
2795  
3324  
3619  
3935  
4274  
4636  
5021  
—
2.75  
3.00  
3.28  
3.90  
4.24  
4.62  
5.01  
5.44  
5.89  
—
1105  
1124  
1144  
1187  
1210  
1234  
1259  
1285  
—
2619  
2841  
3082  
3624  
3925  
4249  
4595  
4964  
—
3.07  
3.33  
3.61  
4.25  
4.60  
4.98  
5.39  
5.82  
—
1163  
1180  
1199  
1240  
1262  
1285  
1309  
—
2899  
3127  
3375  
3929  
4239  
4569  
4922  
—
3.40  
3.67  
3.96  
4.61  
4.97  
5.36  
5.77  
—
1218  
1235  
1252  
1291  
1312  
1334  
—
3187  
3420  
3674  
4241  
4557  
4894  
—
3.74  
4.01  
4.31  
4.97  
5.34  
5.74  
—
1271  
1287  
1304  
1341  
1361  
—
3481  
3720  
3979  
4558  
4880  
—
4.08  
4.36  
4.67  
5.35  
5.72  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
2.6  
AIRFLOW  
(cfm)  
2.2  
Watts  
2.4  
2.8  
3.0  
Watts  
Rpm  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Bhp  
4500  
4800  
5100  
5700  
6000  
6300  
6600  
6900  
7200  
7500  
1322  
1337  
1353  
1388  
—
3781  
4025  
4290  
4881  
—
4.43  
4.72  
5.03  
5.72  
—
1372  
1386  
1401  
—
4088  
4337  
4607  
—
4.79  
5.09  
5.40  
—
1419  
1433  
1448  
—
4400  
4655  
4930  
—
5.16  
5.46  
5.78  
—
1466  
1479  
—
4719  
4978  
—
5.53  
5.84  
—
1511  
—
5042  
—
5.91  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Refer to page 39 for general Fan Performance Data notes.  
Bhp  
Watts  
—
—
Brake Horsepower  
Input Watts to Motor  
NOTE: Maximum continuous bhp for the standard motor is 6.13. The  
maximum continuous watts is 5180. Do not adjust motor rpm such  
that motor maximum bhp and/or watts is exceeded at the maximum  
operating cfm. See Table 25 for more information.  
*Standard low-medium static drive range is 873 to 1021 rpm. Alter-  
nate high-static drive range is 1025 to 1200. Other rpms require a  
field-supplied drive.  
34  
Table 15 — Fan Performance — 48TMF016 (High Heat Units)*  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(cfm)  
0.2  
Watts  
0.4  
0.6  
0.8  
1.0  
Rpm  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
4500  
4800  
5100  
5700  
6000  
6300  
6600  
6900  
7200  
7500  
753  
747  
1307  
1384  
1571  
2054  
2329  
2628  
2951  
3298  
3672  
4072  
1.53  
1.62  
1.84  
2.41  
2.73  
3.08  
3.46  
3.87  
4.31  
4.78  
786  
818  
1404  
1603  
1822  
2323  
2607  
2915  
3246  
3603  
3986  
4394  
1.65  
1.88  
2.14  
2.73  
3.06  
3.42  
3.81  
4.23  
4.67  
5.15  
861  
890  
1644  
1852  
2079  
2598  
2891  
3207  
3547  
3912  
4303  
4720  
1.93  
2.17  
2.44  
3.05  
3.39  
3.76  
4.16  
4.59  
5.05  
5.54  
932  
958  
1893  
2108  
2344  
2879  
3180  
3504  
3853  
4225  
4625  
5050  
2.22  
2.47  
2.75  
3.38  
3.73  
4.11  
4.52  
4.96  
5.42  
5.92  
997  
1022  
1048  
1102  
1130  
1160  
1190  
1220  
1251  
—
2150  
2373  
2616  
3166  
3474  
3807  
4163  
4543  
4950  
—
2.52  
2.78  
3.07  
3.71  
4.08  
4.46  
4.88  
5.33  
5.81  
—
775  
850  
920  
986  
849  
918  
982  
1044  
1074  
1105  
1136  
1168  
1201  
1234  
886  
952  
1015  
1047  
1081  
1115  
1149  
1184  
924  
987  
962  
1023  
1059  
1095  
1131  
1000  
1038  
1077  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(cfm)  
1.2  
Watts  
1.4  
1.8  
2.0  
Watts  
Rpm  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Bhp  
4500  
4800  
5100  
5700  
6000  
6300  
6600  
6900  
7200  
7500  
1060  
1082  
1106  
1157  
1184  
1212  
1241  
1270  
—
2414  
2644  
2894  
3459  
3774  
4114  
4478  
4866  
—
2.83  
3.10  
3.39  
4.06  
4.43  
4.83  
5.25  
5.71  
—
1119  
1140  
1163  
1211  
1236  
1263  
1290  
—
2685  
2922  
3178  
3757  
4080  
4427  
4798  
—
3.15  
3.43  
3.73  
4.41  
4.79  
5.19  
5.63  
—
1175  
1195  
1216  
1262  
1287  
1312  
1338  
—
2964  
3207  
3470  
4061  
4391  
4745  
5122  
—
3.48  
3.76  
4.07  
4.76  
5.15  
5.57  
6.01  
—
1230  
1248  
1268  
1312  
1335  
1359  
—
3250  
3498  
3767  
4371  
4707  
5067  
—
3.81  
4.10  
4.42  
5.13  
5.52  
5.94  
—
1282  
1299  
1319  
1360  
1382  
—
3542  
3795  
4071  
4686  
5029  
—
4.15  
4.45  
4.77  
5.50  
5.90  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
2.6  
AIRFLOW  
(cfm)  
2.2  
Watts  
2.4  
2.8  
3.0  
Watts  
Rpm  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Bhp  
4500  
4800  
5100  
5700  
6000  
6300  
6600  
6900  
7200  
7500  
1332  
1349  
1367  
1407  
—
3841  
4100  
4380  
5007  
—
4.50  
4.81  
5.14  
5.87  
—
1381  
1397  
1414  
—
4145  
4409  
4695  
—
4.86  
5.17  
5.51  
—
1428  
1443  
1460  
—
4456  
4725  
5016  
—
5.23  
5.54  
5.88  
—
1473  
1488  
—
4772  
5046  
—
5.60  
5.92  
—
1518  
—
5095  
—
5.98  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Refer to page 39 for general Fan Performance Data notes.  
Bhp  
Watts  
—
—
Brake Horsepower  
Input Watts to Motor  
NOTE: Maximum continuous bhp for the standard motor is 6.13. The  
maximum continuous watts is 5180. Do not adjust motor rpm such  
that motor maximum bhp and/or watts is exceeded at the maximum  
operating cfm. See Table 25 for more information.  
*Standard low-medium static drive range is 873 to 1021 rpm. Alter-  
nate high-static drive range is 1025 to 1200. Other rpms require a  
field-supplied drive.  
35  
Table 16 — Fan Performance — 48TMD020 (Low Heat Units)*  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
1.2  
Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm  
Bhp  
Watts  
5,500  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
755 2.27  
810 2.72  
866 3.22  
923 3.78  
980 4.39  
1038 5.06  
1096 5.78  
1154 6.56  
1213 7.40  
1272 8.30  
1908  
2287  
2710  
3177  
3690  
4251  
4859  
5517  
6224  
6983  
831 2.58  
881 3.04  
932 3.55  
985 4.11  
1038 4.73  
1093 5.40  
1148 6.13  
1204 6.92  
1260 7.77  
1317 8.67  
2171  
2556  
2985  
3458  
3976  
4542  
5156  
5818  
6531  
7294  
901 2.91  
947 3.37  
994 3.88  
1044 4.45  
1094 5.07  
1146 5.75  
1198 6.49  
1251 7.28  
1306 8.13  
1360 9.05  
2443  
2833  
3266  
3744  
4267  
4838  
5456  
6123  
6840  
7608  
968 3.24  
1010 3.71  
1054 4.23  
1100 4.80  
1148 5.43  
1197 6.11  
1247 6.85  
1298 7.65  
1350 8.51  
1403 9.43  
2723  
3116  
3554  
4036  
4564  
5138  
5761  
6432  
7154  
7926  
1031 3.58  
1070 4.05  
1111 4.57  
1155 5.15  
1200 5.78  
1246 6.47  
1294 7.22  
1343 8.02  
1394 8.88  
1445 9.81  
3009  
3406  
3847  
4333  
4864  
5443  
6070  
6745  
7471  
8247  
1091  
1127  
1166  
1207  
1250  
1294  
1340  
1388  
1436  
3.93  
4.40  
4.93  
5.51  
6.15  
6.84  
7.59  
8.40  
9.26  
3302  
3702  
4146  
4635  
5170  
5752  
6382  
7062  
7791  
8570  
1486 10.19  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(cfm)  
1.4  
1.6  
1.8  
1.9  
2.0  
Rpm Bhp Watts Rpm  
Bhp  
Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts  
5,500  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
1149 4.28  
1183 4.76  
1219 5.29  
1258 5.88  
1299 6.52  
1341 7.21  
1385 7.97  
1431 8.78  
1478 9.65  
3602  
4003  
4450  
4942  
5480  
6065  
6699  
7382  
8114  
—
1204  
1236  
1270  
1307  
1346  
1387  
1429  
1473  
4.65  
5.13  
5.66  
6.25  
6.89  
7.59  
8.35  
9.15  
3907  
4310  
4759  
5253  
5794  
6383  
7019  
7705  
8441  
—
1258 5.02  
1288 5.50  
1320 6.03  
1355 6.62  
1392 7.27  
1392 7.97  
1472 8.73  
1515 9.55  
4217  
4622  
5073  
5569  
6113  
6704  
7343  
8032  
—
1284 5.20  
1313 5.68  
1344 6.22  
1378 6.81  
1415 7.46  
1453 8.16  
1493 8.93  
1535 9.75  
4375  
4780  
5232  
5729  
6273  
6866  
7506  
8196  
—
1309 5.39  
1337 5.87  
1368 6.41  
1402 7.00  
1437 7.65  
1475 8.36  
1514 9.12  
4533  
4939  
5391  
5890  
6435  
7028  
7670  
—
—
—
—
—
—
—
1519 10.04  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Refer to page 39 for general Fan Performance Data notes.  
Bhp — Brake Horsepower  
Watts — Input Watts to Motor  
NOTE: Maximum continuous bhp is 5.90. The maximum continuous watts is  
5180. Do not adjust motor rpm such that motor maximum bhp and/or watts is  
exceeded at the maximum operating cfm. See Table 25 for more information.  
*Standard low-medium static drive range is 910 to 1095 rpm. Alternate high-  
static drive range is 1069 to 1287. Other rpms require a field-supplied drive.  
Table 17 — Fan Performance — 48TMF020 (High Heat Units)*  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
1.2  
Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm  
Bhp  
Watts Rpm Bhp Watts Rpm Bhp Watts  
5,500  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
795 2.43  
854 2.92  
914 3.46  
975 4.06  
1037 4.72  
1099 5.44  
1161 6.22  
1223 7.07  
1286 7.98  
1349 8.95  
2043  
2452  
2909  
3414  
3969  
4575  
5232  
5943  
6708  
7528  
866 2.74  
921 3.24  
977 3.79  
1034 4.39  
1092 5.06  
1150 5.79  
1210 6.57  
1270 7.43  
1331 8.34  
1392 9.32  
2306  
2722  
3184  
3695  
4255  
4866  
5529  
6245  
7014  
7839  
934 3.07  
984 3.57  
2578  
3998  
3465  
3981  
4546  
5162  
5829  
6550  
7324  
8154  
998  
1044  
1093  
1144  
1196  
1249  
1304  
1360  
1416  
3.40  
3.90  
4.46  
5.08  
5.76  
6.50  
7.29  
8.16  
9.08  
2856  
3281  
3752  
4272  
4842  
5462  
6134  
6869  
7638  
8471  
1059 3.74  
1102 4.25  
1148 4.81  
1196 5.43  
1256 6.12  
1297 6.86  
1349 7.66  
1403 8.53  
1457 9.46  
3142  
3570  
4045  
4569  
5142  
5766  
6443  
7171  
7954  
—
1117 4.08  
1158 4.60  
1201 5.16  
1246 5.79  
1294 6.48  
1343 7.22  
1393 8.03  
1445 8.90  
1498 9.84  
3434  
3865  
4343  
4870  
5447  
6075  
6755  
7487  
8274  
—
1036 4.12  
1090 4.73  
1145 5.41  
1201 6.14  
1258 6.93  
1315 7.79  
1374 8.71  
1433 9.70  
1473 10.07  
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(cfm)  
1.4  
1.6  
1.8  
1.9  
Bhp Watts Rpm  
2.0  
Rpm  
Bhp Watts Rpm  
Bhp Watts Rpm  
Bhp Watts Rpm  
Bhp Watts  
5,500  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
1173  
1211  
1252  
1295  
1340  
1388  
1436  
1486  
4.44 3732 1227  
4.95 4165 1263  
5.53 4646 1302  
6.16 5176 1343  
6.85 5756 1386  
7.60 6388 1431  
8.41 7071 1478  
9.28 7807 1527  
4.80  
5.32  
5.89  
6.52  
7.22  
7.97  
8.79  
9.67  
—
4036 1279  
4471 1313  
4954 1350  
5487 1389  
6070 1431  
6704 1474  
7390 1520  
5.17  
5.69  
6.26  
6.90  
7.60  
8.35  
9.17  
—
4345 1304  
4782 1337  
5267 1373  
5802 1412  
6387 1452  
7024 1495  
7713 1540  
5.35  
5.87  
6.56  
7.09  
7.79  
8.54  
9.37  
—
4502 1329  
4939 1361  
5425 1396  
5961 1434  
6547 1474  
7186 1516  
5.54  
6.06  
6.64  
7.28  
7.98  
8.74  
—
4629  
5097  
5584  
6121  
6709  
7348  
—
7876  
—
—
—
—
—
8130  
—
—
—
—
—
—
—
—
—
—
—
—
1538 10.22 8597  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Refer to page 39 for general Fan Performance Data notes.  
Bhp  
—
—
Brake Horsepower  
Input Watts to Motor  
NOTE: Maximum continuous bhp is 5.90. The maximum continuous watts is  
5180. Do not adjust motor rpm such that motor maximum bhp and/or watts is  
exceeded at the maximum operating cfm. See Table 25 for more information.  
Watts  
*Standard low-medium static drive range is 910 to 1095 rpm. Alternate high-  
static drive range is 1069 to 1287. Other rpms require a field-supplied drive.  
36  
Table 18 — Fan Performance — 48TMD025 (Low Heat Units)*  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(cfm)  
0.2  
Watts  
0.4  
0.6  
0.8  
1.0  
Rpm  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
824  
881  
2607  
3030  
3488  
3982  
4512  
5077  
5678  
6315  
6988  
3.09  
3.59  
4.14  
4.72  
5.35  
6.02  
6.74  
7.49  
8.29  
894  
947  
2844  
3266  
3725  
4218  
4748  
5314  
5915  
6552  
7225  
3.37  
3.88  
4.42  
5.00  
5.63  
6.30  
7.02  
7.77  
8.57  
961  
1009  
1060  
1111  
1164  
1218  
1272  
1327  
1383  
3085  
3507  
3965  
4458  
4988  
5553  
6154  
6791  
7465  
3.66  
4.16  
4.70  
5.29  
5.92  
6.59  
7.30  
8.06  
8.86  
1023  
1069  
1116  
1165  
1215  
1266  
1319  
1372  
1426  
3330  
3751  
4208  
4701  
5230  
5795  
6395  
7033  
7706  
3.95  
4.45  
4.99  
5.58  
6.20  
6.87  
7.59  
8.34  
9.14  
1083  
1126  
1170  
1217  
1264  
1314  
1364  
1415  
1468  
3578  
3998  
4454  
4946  
5474  
6039  
6639  
7276  
7949  
4.24  
4.74  
5.28  
5.87  
6.49  
7.16  
7.88  
8.63  
9.43  
939  
1001  
1055  
1111  
1167  
1224  
1282  
1340  
998  
1056  
1116  
1175  
1235  
1295  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(cfm)  
1.2  
Watts  
1.4  
1.8  
Watts  
2.0  
Watts  
Rpm  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Bhp  
Rpm  
Bhp  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
1141  
1181  
1223  
1267  
1313  
1360  
1408  
1458  
1508  
3829  
4247  
4702  
5194  
5721  
6285  
6885  
7521  
8193  
4.54  
5.04  
5.58  
6.16  
6.79  
7.46  
8.17  
8.92  
9.72  
1196  
1234  
1274  
1316  
1359  
1405  
1451  
1499  
1549  
4082  
4499  
4953  
5443  
5970  
6533  
7132  
7768  
8440  
4.84  
5.34  
5.88  
6.46  
7.08  
7.75  
8.46  
9.22  
10.01  
1249  
1285  
1323  
1363  
1405  
1449  
1494  
1540  
—
4337  
4753  
5205  
5694  
6220  
6783  
7381  
8016  
—
5.15  
5.64  
6.18  
6.76  
7.38  
8.05  
8.76  
9.51  
—
1301  
1334  
1371  
1409  
1449  
1491  
1535  
—
4596  
5009  
5460  
5947  
6472  
7034  
7631  
—
5.45  
5.94  
6.48  
7.06  
7.68  
8.34  
9.05  
—
1351  
1383  
1417  
1454  
1493  
1533  
—
4856  
5267  
5716  
6202  
6726  
7286  
—
5.76  
6.25  
6.78  
7.36  
7.98  
8.64  
—
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
2.6  
AIRFLOW  
(cfm)  
2.2  
Watts  
2.4  
2.8  
3.0  
Watts  
Rpm  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Bhp  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
1399  
1429  
1462  
1498  
1535  
—
5118  
5527  
5974  
6459  
6981  
—
6.07  
6.56  
7.09  
7.66  
8.28  
—
1446  
1475  
1507  
1540  
—
5381  
5789  
6234  
6717  
—
6.38  
6.87  
7.40  
7.97  
—
1492  
1520  
1550  
—
5647  
6052  
6495  
—
6.70  
7.18  
7.71  
—
1537  
—
5914  
—
7.02  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Refer to page 39 for general Fan Performance Data notes.  
Bhp  
Watts  
—
—
Brake Horsepower  
Input Watts to Motor  
NOTE: Maximum continuous bhp for the standard motor is 8.7 (for  
208/230 and 575-v units) and 9.5 (for 460-v units). The maximum  
continuous watts is 7915 (for 208/230 and 575-v units) and 8640 (for  
460-v units). Do not adjust motor rpm such that motor maximum bhp  
and/or watts is exceeded at the maximum operating cfm. See  
Table 25 for additional information.  
*Standard low-medium static drive range is 1002 to 1151 rpm. Alter-  
nate high-static drive range is 1193 to 1369. Other rpms require a  
field-supplied drive.  
37  
Table 19 — Fan Performance — 48TMF025 (High Heat Units)*  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(cfm)  
0.2  
Watts  
0.4  
0.6  
0.8  
1.0  
Rpm  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
868  
929  
2752  
3201  
3687  
4211  
4773  
5373  
6011  
6687  
7401  
3.26  
3.80  
4.37  
5.00  
5.66  
6.37  
7.13  
7.93  
8.78  
934  
991  
2987  
3436  
3923  
4447  
5009  
5609  
6247  
6924  
7638  
3.54  
4.08  
4.65  
5.28  
5.94  
6.65  
7.41  
8.21  
9.06  
997  
1051  
1105  
1161  
1218  
1277  
1335  
1395  
1455  
3227  
3675  
4161  
4686  
5247  
5847  
6485  
7162  
7876  
3.83  
4.36  
4.94  
5.56  
6.22  
6.94  
7.69  
8.50  
9.34  
1058  
1108  
1159  
1213  
1267  
1323  
1380  
1437  
1496  
3470  
3917  
4403  
4926  
5488  
6088  
6726  
7402  
8117  
4.12  
4.65  
5.22  
5.84  
6.51  
7.22  
7.98  
8.78  
9.63  
1115  
1162  
1211  
1262  
1314  
1368  
1423  
1479  
1535  
3716  
4163  
4647  
5170  
5731  
6331  
6968  
7644  
8358  
4.41  
4.94  
5.51  
6.13  
6.80  
7.51  
8.27  
9.07  
9.92  
991  
1049  
1109  
1168  
1229  
1290  
1352  
1414  
1054  
1117  
1180  
1244  
1308  
1372  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(cfm)  
1.2  
Watts  
1.4  
1.8  
2.0  
Watts  
Rpm  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Bhp  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
1171  
1215  
1262  
1310  
1360  
1412  
1465  
1519  
—
3965  
4410  
4894  
5415  
5976  
6575  
7212  
7888  
—
4.70  
5.23  
5.81  
6.42  
7.09  
7.80  
8.56  
9.36  
—
1224  
1266  
1311  
1357  
1405  
1455  
1506  
—
4216  
4659  
5142  
5663  
6222  
6821  
7457  
—
5.00  
5.53  
6.10  
6.72  
7.38  
8.09  
8.85  
—
1276  
1316  
1358  
1403  
1449  
1497  
1547  
—
4469  
4911  
5392  
5912  
6471  
7068  
7705  
—
5.30  
5.83  
6.40  
7.01  
7.68  
8.39  
9.14  
—
1326  
1364  
1404  
1447  
1492  
1538  
—
4726  
5165  
5645  
6164  
6721  
7318  
—
5.61  
6.13  
6.70  
7.31  
7.97  
8.68  
—
1374  
1411  
1449  
1490  
1533  
—
4983  
5421  
5899  
6416  
6973  
—
5.91  
6.43  
7.00  
7.61  
8.27  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
2.6  
AIRFLOW  
(cfm)  
2.2  
Watts  
2.4  
2.8  
3.0  
Watts  
Rpm  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Watts  
Bhp  
Rpm  
Bhp  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
1422  
1456  
1493  
1533  
—
5243  
5679  
6155  
6670  
—
6.22  
6.74  
7.30  
7.91  
—
1468  
1501  
1536  
—
5505  
5938  
6412  
—
6.53  
7.04  
7.61  
—
1513  
1544  
—
5768  
6199  
—
6.84  
7.35  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Refer to page 39 for general Fan Performance Data notes.  
Bhp  
Watts  
—
—
Brake Horsepower  
Input Watts to Motor  
NOTE: Maximum continuous bhp for the standard motor is 8.7 (for  
208/230 and 575-v units) and 9.5 (for 460-v units). The maximum  
continuous watts is 7915 (for 208/230 and 575-v units) and 8640 (for  
460-v units). Do not adjust motor rpm such that motor maximum bhp  
and/or watts is exceeded at the maximum operating cfm. See  
Table 25 for more information.  
*Standard low-medium static drive range is 1002 to 1151 rpm. Alter-  
nate high-static drive range is 1193 to 1369. Other rpms require a  
field-supplied drive.  
38  
Table 20 — Fan Performance — 48TMD028 (Low Heat Units)*  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
1.2  
Rpm Bhp  
Watts Rpm Bhp  
Watts Rpm Bhp Watts Rpm Bhp  
Watts Rpm Bhp  
Watts Rpm Bhp  
Watts  
7,000  
7,500  
941  
999  
1058  
1117  
1177  
1237  
1297  
3.35  
4.05  
4.85  
5.74  
6.75  
7.98  
9.12  
2,769 1002  
3,348 1057  
4,007 1113  
4,750 1169  
5,583 1226  
6,511 1284  
7,450 1342  
3.80  
4.53  
5.35  
6.28  
7.31  
8.46  
9.74  
3,140 1061  
3,742 1112  
4,424 1165  
5,190 1219  
6,047 1274  
6,999 1329  
4.27 3528 1117  
5.02 4152 1166  
5.87 4856 1216  
6.83 5645 1268  
7.89 6524 1320  
9.07 7499 1374  
4.76  
5.54  
6.41  
7.40  
8.48  
9.69  
3,934 1171  
4,579 1218  
5,304 1266  
6,114 1315  
7,015 1365  
5.27  
6.07  
6.97  
7.98  
9.09  
4,356 1224  
5,020 1268  
5,766 1314  
6,597 1361  
7,520 1410  
5.80  
6.63  
7.55  
8.58  
9.72  
4,794  
5,478  
6,243  
7,094  
8,037  
9,076  
8,000  
8,500  
9,000  
9,500  
8,012 1417 10.33  
9,110 1469 11.68  
8,538 1459 10.98  
10,000  
10,500  
11,000  
11,250  
8,051 1385 10.37 8574 1428 11.02  
9,657 1510 12.36 10,217  
1358 10.49  
1418 12.00  
1449 12.80 10,585  
8,674 1400 11.14  
9,209 1442 11.80 9755 1483 12.47 10,314 1523 13.16 10,883  
—
—
—
—
—
—
—
—
—
9,919 1459 12.67 10,478  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(cfm)  
1.4  
1.6  
1.8  
Rpm  
Bhp  
Watts Rpm  
Bhp  
Watts Rpm Bhp Watts  
7,000  
7,500  
1274  
1316  
1360  
1406  
6.35 5248 1323  
7.20 6960 1364  
8.14 6734 1406  
9.20 7605 1449  
6.92  
7.79  
8.76  
9.83  
5,718 1371 5.54 6204  
6,437 1410 6.41 6939  
7,239 1450 7.40 7759  
8,129 1492 8.48 8666  
9,111 1536 9.69 9667  
8,000  
8,500  
9,000  
1453 10.36 8568 1495 11.02  
1501 11.64 9627 1541 12.32 10,190  
9,500  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
10,000  
10,500  
11,000  
11,250  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Refer to this page for general Fan Performance Data notes.  
Bhp — Brake Horsepower  
Watts — Input Watts to Motor  
NOTE: Maximum continuous bhp is 10.20 (208/230, 575 v) or 11.80 (460 v)  
and the maximum continuous watts are 9510 (208/230, 575 v) or 11,000  
(460 v). Do not adjust motor rpm such that motor maximum bhp and/or  
watts is exceeded at the maximum operating cfm. See Table 25 for more  
information.  
*Standard low-medium static drive range is 1066 to 1283 rpm. Alternate high-  
static drive range is 1332 to 1550. Other rpms require a field-supplied drive.  
Table 21 — Fan Performance — 48TMF028 (High Heat Units)*  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(cfm)  
0.2  
Bhp  
0.4  
Bhp  
0.6  
0.8  
1.0  
1.2  
Rpm  
Watts Rpm  
Watts Rpm Bhp  
Watts Rpm  
Bhp  
Watts Rpm  
Bhp  
Watts Rpm  
Bhp  
Watts  
7,000  
7,500  
992  
1055  
1118  
1182  
1246  
1310  
1374  
4.05  
4.77  
5.58  
6.46  
7.42  
8.47  
9.61  
3,348 1051  
3,947 1110  
4,610 1170  
5,339 1231  
6,136 1292  
7,005 1354  
4.44  
5.17  
5.99  
6.88  
7.86  
8.92  
3,668 1106  
4,277 1162  
4,950 1220  
5,690 1278  
6,498 1337  
7,377 1397  
4.83 3995 1160  
5.58 4615 1214  
6.41 5298 1268  
7.31 6047 1324  
8.30 6865 1381  
9.38 7754 1439  
5.24 4331 1212  
6.00 4960 1263  
6.84 5653 1315  
7.75 6411 1369  
8.75 7239 1424  
5.65 4675 1262  
6.43 5312 1311  
7.27 6014 1361  
8.20 6782 1413  
9.21 7618 1466  
6.08 5026  
6.86 5672  
7.72 6382  
8.66 7158  
9.68 8003  
8,000  
8,500  
9,000  
9,500  
9.84 8137 1480 10.31 8525 1520 10.79 8918  
10,000  
10,500  
11,000  
11,250  
7,947 1416 10.07  
8,964 1479 11.32  
8,329 1457 10.54 8715 1497 11.02 9107 1537 11.50 9504  
—
—
—
—
—
—
—
—
—
—
—
—
1439 10.84  
9,356 1518 11.79 9752  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
1503 12.17 10,059 1542 12.65 10,460  
1536 12.86 10,636  
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(cfm)  
1.4  
1.6  
1.8  
Bhp Watts  
Rpm  
Bhp Watts Rpm  
Bhp Watts Rpm  
7,000  
7,500  
1311  
1358  
1406  
1456  
6.51 5385 1359  
7.30 6039 1403  
8.17 6767 1560  
9.12 7541 1498  
6.96 5751 1405  
7.76 6412 1448  
8.63 7137 1492  
9.59 7929 1539  
6.00  
6.84  
7.75  
8.75  
—
6124  
6792  
7524  
8323  
—
8,000  
8,500  
9,000  
1507 10.15 8393 1548 10.63 8790  
—
—
—
—
—
—
9,500  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
10,000  
10,500  
11,000  
11,250  
—
—
—
—
—
—
—
—
LEGEND  
Refer to this page for general Fan Performance Data notes.  
Bhp  
— Brake Horsepower  
NOTE: Maximum continuous bhp is 10.20 (208/230, 575 v) or 11.80 (460 v)  
and the maximum continuous watts are 9510 (208/230, 575 v) or 11,000  
(460 v). Do not adjust motor rpm such that motor maximum bhp and/or  
watts is exceeded at the maximum operating cfm. See Table 25 for more  
information.  
Watts — Input Watts to Motor  
*Standard low-medium static drive range is 1066 to 1283 rpm. Alternate high-  
static drive range is 1332 to 1550. Other rpms require a field-supplied drive.  
GENERAL NOTES FOR FAN PERFORMANCE DATA TABLES  
1. Static pressure losses (i.e., economizer) must be added to external  
static pressure before entering Fan Performance table.  
confidence. Using fan motors up to the watts or bhp rating shown will not  
result in nuisance tripping or premature motor failure. Unit warranty will  
not be affected.  
2. Interpolation is permissible. Do not extrapolate.  
3. Fan performance is based on wet coils, clean filters, and casing losses.  
See Table 23 for accessory/FIOP static pressure information.  
4. Extensive motor and drive testing on these units ensures that the  
full horsepower and watts range of the motor can be utilized with  
5. Use of a field-supplied motor may affect wire size. Contact your Carrier  
representative for details.  
39  
Table 22 — Air Quantity Limits  
MINIMUM  
MINIMUM  
COOLING  
CFM  
UNIT  
48TM  
MAXIMUM  
CFM  
HEATING CFM  
Low Heat  
High Heat  
3800  
016  
020  
025  
028  
4500  
5400  
6000  
7000  
3800  
4750  
4750  
4750  
7,500  
9,000  
10,000  
11,250  
5450  
5450  
5450  
Table 23 — Accessory/FIOP Static Pressure (in. wg)* — 48TM016-028  
CFM  
COMPONENT  
4500  
0.040  
0.045  
5000  
0.050  
0.048  
5400  
0.060  
0.060  
6000  
0.070  
0.071  
7200  
0.090  
0.103  
7500  
0.100  
0.111  
9000  
0.110  
0.160  
10,000  
0.120  
0.197  
11,250  
0.140  
0.250  
EconoMi$erIV and EconoMi$er2  
MoistureMi$er™ Dehumidification  
LEGEND  
FIOP  
—
Factory-Installed Option  
*The static pressure must be added to external static pressure. The sum and the evaporator entering-air cfm should then  
be used in conjunction with the Fan Performance tables to determine blower rpm and watts.  
Table 24 — Fan Rpm at Pulley Settings*  
MOTOR PULLEY TURNS OPEN  
UNIT  
48TM  
1
0
/
2
1
11/2  
2
21/2  
3
31/2  
4
41/2  
5
51/2  
6
016†  
††  
††  
††  
††  
††  
††  
††  
††  
††  
††  
††  
††  
††  
††  
††  
††  
††  
††  
††  
††  
1021  
1200  
1058  
1243  
1151  
1369  
1247  
1551  
1002  
1178  
1040  
1222  
1132  
1347  
1225  
1524  
984  
1156  
1021  
1200  
1114  
1325  
1203  
1497  
965  
1134  
1002  
1178  
1095  
1303  
1182  
1470  
947  
1112  
984  
928  
1091  
965  
910  
891  
1047  
928  
873  
1025  
910  
016**  
020†  
020**  
025†  
025**  
028†  
028**  
1069  
947  
1095  
1287  
††  
1077  
1265  
††  
1156  
1077  
1281  
1160  
1443  
1134  
1058  
1259  
1138  
1415  
1112  
1040  
1237  
1116  
1388  
1091  
1021  
1215  
1095  
1361  
1069  
1002  
1193  
1066  
1332  
††  
††  
1283  
††  
1269  
††  
*Approximate fan rpm shown.  
†Indicates standard drive package.  
**Indicates alternate drive package.  
††Due to belt and pulley size, pulley cannot be set to this number of turns open.  
Table 25 — Evaporator-Fan Motor Data  
MAXIMUM  
MAXIMUM  
ACCEPTABLE  
CONTINUOUS  
BkW*  
MAXIMUM  
ACCEPTABLE  
OPERATING  
WATTS  
UNIT  
48TM  
UNIT  
VOLTAGE  
ACCEPTABLE  
CONTINUOUS  
BHP*  
MAXIMUM  
AMP DRAW  
208/230  
460  
15.8  
7.9  
016  
020  
025  
028  
6.13  
5.90  
4.57  
4.40  
5,180  
5,180  
575  
6.0  
208/230  
460  
15.8  
7.9  
575  
6.0  
208/230  
460  
8.70  
9.50  
6.49  
7.08  
6.49  
7.61  
8.80  
7.61  
7,915  
8,640  
7,915  
9,510  
11,000  
9,510  
22.0  
13.0  
10.0  
28.0  
14.6  
13.0  
575  
8.70  
208/230  
460  
10.20  
11.80  
10.20  
575  
LEGEND  
BHP  
BkW  
—
—
Brake Horsepower  
Brake Kilowatts  
Table 26 — Evaporator-Fan Motor Efficiency  
*Extensive motor and electrical testing on these units ensures that the full  
horsepower (brake kilowatt) range of the motors can be utilized with confi-  
dence. Using fan motors up to the horsepower (brake kilowatt) ratings shown  
in this table will not result in nuisance tripping or premature motor failure.  
Unit warranty will not be affected.  
NOTE: All indoor-fan motors 5 hp and larger meet the minimum efficiency  
requirements as established by the Energy Policy Act of 1992 (EPACT) effec-  
tive October 24, 1997.  
UNIT  
48TM  
5 Hp  
7.5 Hp  
10 Hp  
MOTOR EFFICIENCY  
(%)  
87.5  
88.5  
89.5  
NOTE: All indoor-fan motors 5 hp and larger meet the minimum efficiency  
requirements as established by the Energy Policy Act of 1992 (EPACT) effec-  
tive October 24, 1997.  
40  
the dampers open to maintain the supply air temperature set  
point at 50 to 55 F.  
As the supply air temperature drops below the set point  
range of 50 to 55 F, the control will modulate the outdoor-air  
dampers closed to maintain the proper supply-air temperature.  
HEATING, UNITS WITH ECONOMI$ERIV — When the  
room thermostat calls for heat, the heating controls are ener-  
gized as described in the Heating, Units Without Economizer  
section. When the indoor fan is energized, the economizer  
damper moves to the minimum position. When the indoor fan  
is off, the economizer damper is fully closed.  
COOLING, UNITS WITH ECONOMI$ER2, PREMIER-  
LINK™ CONTROL AND A THERMOSTAT — When free  
cooling is not available, the compressors will be controlled by  
the PremierLink control in response to the Y1 and Y2 inputs  
from the thermostat.  
Operating Sequence  
COOLING, UNITS WITHOUT ECONOMIZER — When  
thermostat calls for cooling, terminals G and Y1 are energized.  
The indoor (evaporator) fan contactor (IFC), compressor con-  
tactor no. 1 (C1) and outdoor-fan contactor (OFC) are ener-  
gized, and evaporator-fan motor, compressor no. 1, and both  
condenser fans start. The condenser-fan motors run continuous-  
ly while unit is cooling. If the thermostat calls for a second stage  
of cooling by energizing Y2, compressor contactor no. 2 (C2) is  
energized and compressor no. 2 starts.  
When the thermostat is satisfied, C1 and C2 are deener-  
gized and the compressors and outdoor (condenser) fan motors  
(OFM) shut off. After a 30-second delay, the indoor (evapora-  
tor) fan motor (IFM) shuts off. If the thermostat fan selector  
switch is in the ON position, the evaporator-fan motor will run  
continuously.  
HEATING, UNITS WITHOUT ECONOMIZER — When  
the thermostat calls for heating, terminal W1 is energized. In  
order to prevent thermostat short-cycling, the unit is locked  
into the Heating mode for at least 1 minute when W1 is ener-  
gized. The induced-draft motor (IDM) is then energized and  
the burner ignition sequence begins. The indoor (evaporator)  
fan motor (IFM) is energized 45 seconds after a flame is  
ignited. On units equipped for two stages of heat, when addi-  
tional heat is needed, W2 is energized and the high-fire sole-  
noid on the main gas valve (MGV) is energized. When the  
thermostat is satisfied and W1 and W2 are deenergized, the  
IFM stops after a 45-second time-off delay.  
COOLING, UNITS WITH ECONOMI$ERIV — When free  
cooling is not available, the compressors will be controlled by  
the zone thermostat. When free cooling is available, the  
outdoor-air damper is modulated by the EconoMi$erIV control  
to provide a 50 to 55 F supply-air temperature into the zone. As  
the supply-air temperature fluctuates above 55 or below 50 F,  
the dampers will be modulated (open or close) to bring the  
supply-air temperature back within the set point limits.  
For EconoMi$erIV operation, there must be a thermostat  
call for the fan (G). This will move the damper to its minimum  
position during the occupied mode.  
Above 50 F supply-air temperature, the dampers will modu-  
late from 100% open to the minimum open position. From 50 F  
to 45 F supply-air temperature, the dampers will maintain  
at the minimum open position. Below 45 F the dampers will  
be completely shut. As the supply-air temperature rises, the  
dampers will come back open to the minimum open position  
once the supply-air temperature rises to 48 F.  
The PremierLink control will use the following information  
to determine if free cooling is available:  
• Indoor fan has been on for at least 30 seconds.  
• The SPT, SAT, and OAT inputs must have valid readings.  
• OAT must be less than 75 F.  
• OAT must be less than SPT.  
• Enthalpy must be LOW (may be jumpered if an enthalpy  
sensor not available).  
• Economizer position is NOT forced.  
Pre-cooling occurs when the is no call from the thermostat  
except G. Pre-cooling is defined as the economizer modulates  
to provide 70 F supply air.  
When free cooling is available the PremierLink control will  
control the compressors and economizer to provide a supply-  
air temperature determined to meet the Y1 and Y2 calls from  
the thermostat using the following three routines. The three  
control routines are based on OAT.  
The 3 routines are based on OAT where:  
SASP = Supply Air Set Point  
DXCTLO = Direct Expansion Cooling Lockout Set Point  
PID = Proportional Integral  
Routine 1 (OAT < DXCTLO)  
• Y1 energized – economizer maintains a SASP =  
(SATLO1 + 3).  
• Y2 energized – economizer maintains a SASP =  
(SATLO2 + 3).  
Routine 2 (DXCTLO < OAT < 68 F)  
• If only Y1 energized, the economizer maintains a SASP  
= (SATLO1 + 3).  
• If SAT > SASP + 5 and economizer position > 80%,  
economizer will go to minimum position for 3 minutes or  
until SAT > 68 F.  
If optional power exhaust is installed, as the outdoor-air  
damper opens and closes, the power exhaust fans will be ener-  
gized and deenergized.  
If field-installed accessory CO2 sensors are connected to the  
EconoMi$er IV control, a demand controlled ventilation strate-  
gy will begin to operate. As the CO2 level in the zone increases  
above the CO2 set point, the minimum position of the damper  
will be increased proportionally. As the CO2 level decreases  
because of the increase in fresh air, the outdoor-air damper will  
be proportionally closed. Damper position will follow the high-  
er demand condition from DCV mode or free cooling mode.  
Damper movement from full closed to full open (or vice  
versa) will take between 11/2 and 21/2 minutes.  
If free cooling can be used as determined from the appropri-  
ate changeover command (switch, dry bulb, enthalpy curve,  
differential dry bulb, or differential enthalpy), a call for cooling  
(Y1 closes at the thermostat) will cause the control to modulate  
• First stage of mechanical cooling will be energized.  
• Integrator resets.  
• Economizer opens again and controls to current SASP  
after stage one on for 90 seconds.  
• With Y1 and Y2 energized economizer maintains an  
SASP = SATLO2 + 3.  
• If SAT > SASP + 5 and economizer position >80%,  
economizer will go to minimum position for 3 minutes or  
until SAT > 68 F.  
• If compressor one is on then second stage of mechanical  
cooling will be energized. Otherwise the first stage will  
be energized.  
• Integrator resets.  
• Economizer opens again and controls to SASP after  
stage one on for 90 seconds.  
41  
Routine 3 (OAT > 68)  
• Economizer is opened 100%.  
below the cooling set point, allowing for a smooth transition  
from mechanical cooling with economizer assist, back to  
economizer cooling as the cooling set point is achieved.  
The compressors may be used for initial cooling then the  
PremierLink controller will modulate the economizer using an  
error reduction calculation to hold the space temperature  
between the heating and cooling set points. See Fig. 48.  
The controller uses the following conditions to determine  
economizer cooling:  
• Enthalpy is Low  
• Compressors 1 and 2 are cycled based on Y1 and Y2  
using minimum on and off times and watching the sup-  
ply air temperature as compared to SATLO1 and  
SATLO2 set points.  
If optional power exhaust is installed, as the outdoor-air  
damper opens and closes, the power exhaust fans will be ener-  
gized and deenergized.  
If field-installed accessory CO2 sensors are connected to the  
PremierLink™ control, a PID-controlled demand ventilation  
strategy will begin to operate. As the CO2 level in the zone  
increases above the CO2 set point, the minimum position of the  
damper will be increased proportionally. As the CO2 level  
decreases because of the increase in fresh air, the outdoor-air  
damper will be proportionally closed.  
HEATING, UNITS WITH ECONOMI$ER2, PREMIERLINK  
CONTROL AND A THERMOSTAT — When the thermostat  
calls for heating, terminal W1 is energized. The PremierLink  
control will move the economizer damper to the minimum  
position if there is a call for G and closed if there is a call for  
W1 without G. In order to prevent thermostat from short cy-  
cling, the unit is locked into the heating mode for at least  
10 minutes when W1 is energized. The induced-draft motor is  
then energized and the burner ignition sequence begins.  
• SAT reading is available  
• OAT reading is available  
• SPT reading is available  
• OAT ≤ SPT  
• Economizer Position is NOT forced  
If any of the above conditions are not met, the economizer  
submaster reference (ECSR) is set to maximum limit and the  
damper moves to minimum position. The operating sequence  
is complete. The ECSR is recalculated every 30 seconds.  
If an optional power exhaust is installed, as the outdoor-air  
damper opens and closes, the power exhaust fans will be  
energized and deenergized.  
If field-installed accessory CO2 sensors are connected to  
the PremierLink control, a PID-controlled demand ventilation  
strategy will begin to operate. As the CO2 level in the zone  
increases above the CO2 set point, the minimum position of the  
damper will be increased proportionally. As the CO2 level  
decreases because of the increase in fresh air, the outdoor-air  
damper will be proportionally closed.  
On units equipped for two stages of heat, when additional  
heat is needed, W2 is energized and the high-fire solenoid on  
the main gas valve (MGV) is energized. When the thermostat  
is satisfied and W1 is deenergized, the IFM stops after a  
45-second time-off delay unless G is still maintained.  
COOLING, UNITS WITH ECONOMI$ER2, PREMIER-  
LINK CONTROL AND A ROOM SENSOR — When free  
cooling is not available, the compressors will be controlled by  
the PremierLink controller using a PID Error reduction calcula-  
tion as indicated by Fig 47.  
TEMPERATURE CONTROL  
75  
74  
73  
The PremierLink controller will use the following informa-  
tion to determine if free cooling is available:  
72  
SET POINT  
71  
70  
TEMPERATURE  
• Indoor fan has been on for at least 30 seconds.  
• The SPT, SAT, and OAT inputs must have valid readings.  
• OAT must be less than 75 F.  
69  
68  
• OAT must be less than SPT.  
TIME  
• Enthalpy must be LOW (may be jumpered if and  
enthalpy sensor is not available).  
• Economizer position is NOT forced.  
When free cooling is available, the outdoor-air damper is  
positioned through the use of a Proportional Integral (PID)  
control process to provide a calculated supply-air temperature  
into the zone. The supply air will maintain the space tempera-  
ture between the heating and cooling set points as indicated in  
Fig. 48.  
NOTE: PremierLink control performs smart staging of 2 stages of DX  
cooling and up to 3 stages of heat.  
Fig. 47 — DX Cooling Temperature  
Control Example  
The PremierLink will integrate the compressors stages with  
the economizer based on similar logic as the three routines list-  
ed in the previous section. The SASP will float up and down  
based on the error reduction calculations that compare space  
temperature and space set point.  
TEMPERATURE CONTROL  
75  
74  
73  
When outdoor-air temperature conditions require the econo-  
mizer to close for a compressor stage-up sequence, the econo-  
mizer control integrator is reset to zero after the stage-up  
sequence is completed. This prevents the supply-air tempera-  
ture from dropping too quickly and creating a freeze condition  
that would make the compressor turn off prematurely.  
72  
71  
COOL SETPOINT  
TEMPERATURE  
HEAT SETPOINT  
70  
69  
68  
TIME  
The high space set point is used for DX (direct expansion)  
cooling control, while the economizer space set point is a  
calculated value between the heating and cooling set points.  
The economizer set point will always be at least one degree  
Fig. 48 — Economizer Temperature  
Control Example  
42  
HEATING, UNIT WITH ECONOMI$ER2, PREMIERLINK  
CONTROL AND A ROOM SENSOR — Every 40 seconds  
the controller will calculate the required heat stages (maximum  
of 3) to maintain supply air temperature (SAT) if the following  
qualifying conditions are met:  
• Indoor fan has been on for at least 30 seconds.  
• COOL mode is not active.  
CERAMIC  
BAFFLE  
CLIP  
• OCCUPIED, TEMP.COMPENSATED START or HEAT  
mode is active.  
• SAT reading is available.  
• Fire shutdown mode is not active.  
If all of the above conditions are met, the number of heat  
stages is calculated; otherwise the required number of heat  
stages will be set to 0.  
If the PremierLink controller determines that heat stages are  
required, the economizer damper will be moved to minimum  
position if occupied and closed if unoccupied.  
Staging should be as follows:  
If Heating PID STAGES=2  
• HEAT STAGES=1 (75% capacity) will energize HS1  
• HEAT STAGES=2 (100% capacity) will energize HS2  
HEAT EXCHANGER  
TUBES  
NOTE: One baffle and clip will be in each upper tube of the heat  
exchanger.  
Fig. 49 — Removing Heat Exchanger Ceramic  
Baffles and Clips  
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  
combustion fan housing. The motor and wheel assembly will  
slide up and out of the fan housing. Remove the blower wheel  
from the motor shaft and clean with a detergent or solvent.  
Replace motor and wheel assembly.  
EVAPORATOR COIL — Clean as required with a commer-  
cial coil cleaner.  
CONDENSER COIL — Clean condenser coil annually and  
as required by location and outdoor-air conditions. Inspect coil  
monthly — clean as required.  
In order to prevent short cycling, the unit is locked into the  
Heating mode for at least 10 minutes when HS1 is deenergized.  
When HS1 is energized the induced-draft motor is then  
energized and the burner ignition sequence begins. On units  
equipped for two stages of heat, when additional heat is need-  
ed, HS2 is energized and the high-fire solenoid on the main gas  
valve (MGV) is energized. When the space condition is satis-  
fied and HS1 is deenergized the IFM stops after a 45-second  
time-off delay unless in the occupied mode. The fan will run  
continuously in the occupied mode as required by national  
energy and fresh air standards.  
SERVICE  
CONDENSATE DRAIN — Check and clean each year at  
start of cooling season. In winter, keep drains and traps dry.  
FILTERS — Clean or replace at start of each heating and cool-  
ing season, or more often if operating conditions require. Refer  
to Table 1 for type and size.  
Before performing service or maintenance operations on  
unit, turn off main power switch to unit. Electrical shock  
could cause personal injury.  
NOTE: The 48TM028 unit requires industrial grade throw-  
away filters capable of withstanding face velocities up to  
625 fpm. Ensure that replacement filters for the 48TM028  
units are rated for 625 fpm.  
OUTDOOR-AIR INLET SCREENS — Clean screens with  
steam or hot water and a mild detergent. Do not use throwaway  
filters in place of screens.  
Cleaning — Inspect unit interior at beginning of each  
heating and cooling season and as operating conditions require.  
Remove unit top panel and/or side panels for access to unit  
interior.  
MAIN BURNER — 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 Burn-  
ers section on page 46.  
Lubrication  
COMPRESSORS — Each compressor is charged with the  
correct amount of oil at the factory. Conventional white oil  
(Sontext 200LT) is used. White oil is compatible with 3GS oil,  
and 3GS oil may be used if the addition of oil is required. See  
compressor nameplate for original oil charge. A complete  
recharge should be four ounces less than the original oil charge.  
When a compressor is exchanged in the field it is possible that  
a major portion of the oil from the replaced compressor may  
still be in the system. While this will not affect the reliability of  
the replacement compressor, the extra oil will add rotor drag  
and increase power usage. To remove this excess oil, an access  
valve may be added to the lower portion of the suction line at  
the inlet of the compressor. The compressor should then be run  
for 10 minutes, shut down, and the access valve opened until  
no oil flows. This should be repeated twice to make sure the  
proper oil level has been achieved.  
FLUE GAS PASSAGEWAYS — The flue collector box and  
heat exchanger cells may be inspected by removing heat  
exchanger access panel (Fig. 4-6), flue box cover, and main  
burner assembly. Refer to Main Burners section on page 46 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. 49.  
COMBUSTION-AIR BLOWER — Clean periodically to  
assure proper airflow and heating efficiency. Inspect blower  
wheel every fall and periodically during heating season. For the  
first heating season, inspect blower wheel bi-monthly to deter-  
mine proper cleaning frequency.  
43  
FAN SHAFT BEARINGS — Lubricate bearings at least  
every 6 months with suitable bearing grease. Extended grease  
line is provided for far side fan bearing (opposite drive side).  
Typical lubricants are given below:  
6. Replace and tighten belts. See Belt Tension Adjustment  
section on page 45.  
To align fan and motor pulleys:  
1. Loosen fan pulley setscrews.  
2. Slide fan pulley along fan shaft.  
MANUFACTURER  
LUBRICANT  
Texaco  
Mobil  
Sunoco  
Texaco  
Regal AFB-2*  
Mobilplex EP No. 1  
Prestige 42  
3. Make angular alignment by loosening motor from  
mounting plate.  
Multifak 2  
Evaporator Fan Service and Replacement — The  
48TM units use a fan motor mounting system that features a  
slide-out motor mounting plate. See Fig. 51. To replace or ser-  
vice the motor, slide out the bracket.  
1. Remove the evaporator-fan access panel and the heat-  
ing control access panel.  
*Preferred lubricant because it contains rust and oxidation inhibitors.  
CONDENSER AND EVAPORATOR-FAN MOTOR  
BEARINGS — The condenser-fan and evaporator-fan motors  
have permanently sealed bearings, so no field lubrication is  
necessary.  
2. Remove the center post (located between the evaporator  
fan and heating control access panels) and all screws  
securing it.  
3. Loosen nuts on the 2 carriage bolts in the motor mounting  
base.  
Evaporator Fan Performance Adjustment  
(Fig. 50 and 51) — Fan motor pulleys are factory set for  
speed shown in Table 1.  
To change fan speeds:  
1. Shut off unit power supply.  
4. Using jacking bolt under motor base, raise motor to top of  
slide and remove belt. Secure motor in this position by  
tightening the nuts on the carriage bolts.  
5. Remove the belt drive.  
6. Remove jacking bolt and tapped jacking bolt plate.  
7. Remove the 2 screws that secure the motor mounting  
plate to the motor support channel.  
8. Remove the 3 screws from the end of the motor support  
channel that interfere with the motor slide path.  
9. Slide out the motor and motor mounting plate.  
10. Disconnect wiring connections and remove the 4 mount-  
ing bolts.  
2. Loosen nuts on the 2 carriage bolts in the motor mounting  
base. Install jacking bolt and plate under motor base (bolt  
and plate are shipped in installer’s packet). Using bolt and  
plate, raise motor to top of slide and remove belt. Secure  
motor in this position by tightening the nuts on the car-  
riage bolts.  
3. Loosen movable-pulley flange setscrew (see Fig. 50).  
4. Screw movable flange toward fixed flange to increase  
speed and away from fixed flange to decrease speed. In-  
creasing fan speed increases load on motor. Do not ex-  
ceed maximum speed specified in Table 1.  
See Table 22 for air quantity limits.  
11. Remove the motor.  
12. To install the new motor, reverse Steps 1-11.  
5. Set movable flange at nearest keyway of pulley hub and  
tighten setscrew. (See Table 1 for speed change for each  
full turn of pulley flange.)  
NOTE: A 31/2-in. bolt and threaded plate are included in the  
installer’s packet. They should be added to the motor support chan-  
nel below the motor mounting plate to aid in raising the motor. The  
plate part number is 50DP503842. The adjustment bolt is 3/8-16 x  
13/4 in. LG.  
Fig. 51 — Evaporator-Fan Motor Section  
Fig. 50 — Evaporator-Fan Pulley  
and Adjustment  
44  
Belt Tension Adjustment — To adjust belt tension:  
1. Loosen fan motor bolts.  
2. Turn motor jacking bolt to move motor mounting plate up  
or down for proper belt tension (3/8 in. deflection at  
midspan with one finger [9 lb force]).  
3. Tighten nuts.  
4. Adjust bolts and nut on mounting plate to secure motor in  
fixed position.  
Refrigerant Charge — Amount of refrigerant charge is  
listed on unit nameplate and in Table 1. Refer to Carrier GTAC  
II; Module 5; Charging, Recovery, Recycling, and Reclama-  
tion section for charging methods and procedures. Unit  
panels must be in place when unit is operating during charging  
procedure.  
NOTE: Do not use recycled refrigerant as it may contain  
contaminants.  
NO CHARGE — Use standard evacuating techniques. After  
evacuating system, weigh in the specified amount of refriger-  
ant (refer to Table 1).  
LOW CHARGE COOLING — Using cooling charging chart  
(see Fig. 54), add or remove refrigerant until conditions of the  
chart are met. Note that charging chart is different from those  
normally used. An accurate pressure gage and temperature-  
sensing device is required. Charging is accomplished by  
ensuring the proper amount of liquid subcooling. Measure  
liquid line pressure at the liquid line service valve using  
pressure gage. Connect temperature sensing device to the  
liquid line near the liquid line service valve and insulate it so  
that outdoor ambient temperature does not affect reading.  
Condenser-Fan Adjustment  
48TM016,020,028 UNITS (Fig. 52)  
1. Shut off unit power supply.  
2. Remove access panel(s) closest to the fan to be adjusted.  
3. Loosen fan hub setscrews.  
4. Adjust fan height on shaft using a straightedge placed  
across the fan orifice.  
5. Tighten setscrews and replace panel(s).  
6. Turn on unit power.  
48TM025 UNITS (Fig. 53)  
TO USE THE COOLING CHARGING CHART — Use the  
above temperature and pressure readings, and find the intersec-  
tion point on the cooling charging chart. If intersection point  
on chart is above line, add refrigerant. If intersection point on  
chart is below line, carefully recover some of the charge.  
Recheck suction pressure as charge is adjusted.  
1. Shut off unit power supply.  
2. Remove fan top-grille assembly and loosen fan hub  
screws.  
3. Adjust fan height on unit, using a straightedge placed  
across the fan orifice.  
4. Tighten setscrews and replace rubber hubcap to prevent  
hub from rusting to motor shaft.  
NOTE: Indoor-air cfm must be within normal operating range  
of unit. All outdoor fans must be operating.  
5. Fill hub recess with permagum if rubber hubcap is  
missing.  
The TXV (thermostatic expansion valve) is set to maintain  
between 15 and 20 degrees of superheat at the compressors.  
The valves are factory set and should not require re-adjustment.  
Power Failure — Dampers have a spring return. In event  
of power failure, dampers will return to fully closed position  
until power is restored. Do not manually operate economizer  
motor.  
MOISTUREMI$ER™ SYSTEM CHARGING — The sys-  
tem charge for units with the MoistureMi$er option is greater  
than that of the standard unit alone. The charge for units with  
this option is indicated on the unit nameplate drawing. To  
charge systems using the MoistureMi$er dehumidification  
package, fully evacuate, recover, and re-charge the system to  
the nameplate specified charge level. To check or adjust  
refrigerant charge on systems using the MoistureMi$er  
dehumidification package, charge per the standard subcooling  
charts. The subcooler MUST be deenergized to use the  
charging charts. The charts reference a liquid pressure (psig)  
and temperature at a point between the condenser coil and the  
subcooler coil. A tap is provided on the unit to measure liquid  
pressure entering the subcooler (leaving the condenser).  
NOTE: Dimensions are in inches.  
BOTH CIRCUITS  
ALL OUTDOOR FANS MUST BE OPERATING  
140  
Fig. 52 — Condenser Fan Adjustment,  
48TM016,020,028  
120  
ADD CHARGE IF ABOVE CURVE  
100  
80  
REDUCE CHARGE IF BELOW CURVE  
60  
40  
50  
NOTE: Dimensions are in inches.  
100  
150  
200  
250  
300  
350  
400  
LIQUID PRESSURE AT LIQUID VALVE (PSIG)  
Fig. 53 — Condenser-Fan Adjustment,  
48TM025  
Fig. 54 — Cooling Charging Chart  
45  
CLEANING AND ADJUSTMENT  
Gas Valve Adjustment  
1. Remove burner rack from unit as described in Main  
Burner Removal section above.  
NATURAL GAS — The gas valve opens and closes in  
response to the thermostat or limit control.  
2. Inspect burners, and if dirty, remove burners from rack.  
3. Using a soft brush, clean burners and crossover port as  
required.  
4. Adjust spark gap. See Fig. 56.  
5. Reinstall burners on rack.  
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.  
6. Reinstall burner rack as described above.  
Filter Drier — Replace whenever refrigerant system is  
1
3. Remove /8-in. pipe plug from manifold or gas valve  
exposed to atmosphere.  
pressure tap connection. Install a suitable pressure-  
measuring device.  
Protective Devices  
COMPRESSOR PROTECTION  
4. Set main gas valve to ON position.  
Overcurrent — Each compressor has internal line break motor  
protection.  
Crankcase Heater — All units are equipped with a 70-watt  
crankcase heater to prevent absorption of liquid refrigerant by  
oil in the crankcase when the compressor is idle. The crank-  
case heater is energized whenever there is a main power to the  
unit and the compressor is not energized.  
5. Set thermostat at setting to call for heat.  
6. Remove screw cap covering regulator adjustment screw  
(See Fig. 55).  
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  
IMPORTANT: After a prolonged shutdown or servicing,  
energize the crankcase heaters for 24 hours before start-  
ing the compressors.  
and screw cap.  
REGULATOR  
ADJUSTMENT SCREW  
(REMOVE COVER)  
2 LEADS, #18 WIRE 1/32 INSULATION,  
600V. MAX., 105°C  
Compressor Lockout — If any of the safeties (high-pressure,  
low-pressure, freeze protection thermostat, compressor internal  
thermostat) trip, or if there is loss of power to the compressors,  
the cooling lockout (CLO) will lock the compressors off. To  
reset, manually move the thermostat setting.  
OUTLET PRESSURE  
TAP (PLUGGED)  
1/8-27 N.P.T. THDS.  
EVAPORATOR-FAN MOTOR PROTECTION — A man-  
ual 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.  
RECEPTACLE AND  
TAB COMBINATION  
TERMINAL  
D-1  
W-1  
D-2  
C1  
CONDENSER-FAN MOTOR PROTECTION — Each  
condenser-fan motor is internally protected against  
overtemperature.  
HIGH-PRESSURE AND LOW-PRESSURE SWITCHES —  
If either switch trips, or if the compressor overtemperature  
switch activates, that refrigerant circuit will be automatically  
locked out by the CLO. To reset, manually move the thermo-  
stat setting.  
C2  
W-2  
PILOT CONNECTION  
FOR 1/4” O.D. TUBING  
(PLUGGED)  
INLET PRESSURE TAP  
(PLUGGED)  
1/8 - 27 N.P.T. THDS.  
RECEPTACLE TERMINAL  
Fig. 55 — Gas Valve  
FREEZE PROTECTION THERMOSTAT (FPT) — An FPT  
is located on the top and bottom of the evaporator coil. They  
detect frost build-up and turn off the compressor, allowing the  
coil to clear. Once the frost has melted, the compressor can be  
reenergized by resetting the compressor lockout.  
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 unit control box access panel, burner section  
access panel, and center post (Fig. 4-6).  
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.  
Relief Devices — All units have relief devices to protect  
against damage from excessive pressures (i.e., fire). These  
devices protect the high and low side.  
Control Circuit, 24-V — This control circuit is pro-  
tected against overcurrent by a 3.2 amp circuit breaker.  
Breaker can be reset. If it trips, determine cause of trouble  
before resetting. See Fig. 57 and 58 for typical wiring  
diagrams.  
Replacement Parts — A complete list of replacement  
parts may be obtained from any Carrier distributor upon  
request.  
10. Lift burner assembly out of unit.  
46  
control box access door is interlocked with the non-fused  
disconnect which must be in the OFF position to open the door.  
Two doors are provided on 48TM016-025 units for access to  
the compressor compartment.  
Two internal access doors are provided inside the filter/  
drive access door. The filter access door (on the left) is secured  
by 2 small 1/4 turn latches with folding bail-type handles. This  
door must be opened prior to opening the drive access door.  
The drive access door is shipped with 2 sheet metal screws  
holding the door closed. Upon initial opening of the door, these  
screws may be removed and discarded. The door is then held  
shut by the filter access door, which closes over it.  
Diagnostic IGC Control LEDs — The IGC board  
has LEDs for diagnostic purposes. Refer to Troubleshooting  
section on page 51.  
Optional Hinged Access Doors — When the optional  
service package is ordered or the if the hinged access doors  
option is ordered, the unit will be provided with external and  
internal hinged access doors to facilitate service.  
Four external hinged access doors are provided on size  
016-025 units. Two external hinged doors are provided on size  
028 units. All external doors are provided with 2 large 1/4 turn  
latches with folding bail-type handles. (Compressor access  
doors have one latch.) A single door is provided for filter and  
drive access. One door is provided for control box access. The  
SEE  
DETAIL  
"C"  
48TMD016  
SEE  
DETAIL  
"C"  
48TMD020-028 AND 48TMF016  
SEE  
DETAIL  
"C"  
48TMF020-028  
Fig. 56 — Spark Gap Adjustment  
47  
Fig. 57 — Typical Wiring Schematic (48TM016,020 — 208/230 V Shown)  
48  
Fig. 58 — Typical Component Arrangement  
49  
LEGEND AND NOTES FOR FIG. 57 AND 58  
LEGEND  
AHA  
C
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Adjustable Heat Anticipator  
Contactor, Compressor  
Capacitor  
LED  
LOR  
LPS  
LS  
—
—
—
—
—
—
—
Light-Emitting Diode  
Lockout Relay  
Ter minal Block  
Splice  
CAP  
CB  
Low-Pressure Switch  
Limit Switch  
Circuit Breaker  
CC  
CH  
Cooling Compensator  
Crankcase Heater  
Compressor Lockout  
Compressor Motor  
Control Relay  
Damper Motor  
Dummy Terminal  
Equipment  
MGV  
NEC  
OAT  
Main Gas Valve  
National Electrical Code  
Outdoor Air Temperature Sensor  
Factory Wiring  
CLO  
COMP  
CR  
Field Control Wiring  
Option/Accessory Wiring  
OCCUP — Occupancy Sensor  
OFC  
OFM  
PL  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Outdoor-Fan Contactor  
Outdoor-Fan Motor  
Plug Assembly  
Primary  
Quadruple Terminal  
Return Air Temperature Sensor  
Rollout Switch  
Sensor  
Solenoid Relay  
Switch  
Terminal Block  
Thermostat Cooling  
Thermostat Heating  
Transformer  
DM  
DU  
To indicate common potential  
only; not to represent wiring.  
EQUIP  
FPT  
FU  
PRI  
QT  
Economizer Motor  
Freeze Protection Thermostat  
Fuse  
Ground  
RAT  
RS  
Remote POT Field  
Accessory  
GND  
HPS  
HS  
HV  
I
IAQ  
IDM  
IFC  
IFCB  
IFM  
IGC  
L
High-Pressure Switch  
Hall Effect Sensor  
High Voltage  
SN  
SR  
SW  
TB  
OAT Sensor  
Ignitor  
Indoor Air Quality Sensor  
Induced-Draft Motor  
Indoor-Fan Contactor  
Indoor-Fan Circuit Breaker  
Indoor-Fan Motor  
Integrated Gas Unit Controller  
Light  
TC  
Disch Air Sensor  
TH  
TRAN  
RAT Accessory Sensor  
Low Ambient Lockout Switch  
Terminal (Marked)  
Terminal (Unmarked)  
NOTES:  
1. Compressor and/or fan motor(s) thermally protected. Three-phase motors protected against primary single phasing conditions.  
2. If any of the original wire furnished must be replaced, it must be replaced with Type 90° C or its equivalent.  
3. Jumpers are omitted when unit is equipped with economizer.  
4. IFCB must trip amps is equal to or less than 140% FLA.  
5. On TRAN1 use BLK lead for 460-v power supply and ORN lead for 575-v power supply.  
6. The CLO locks out the compressor to prevent short cycling on compressor overload and safety devices; before replacing CLO check these devices.  
7. Number(s) indicates the line location of used contacts. A bracket over (2) numbers signifies a single pole, double throw contact. An underlined num-  
ber signifies a normally closed contact. Plain (no line) number signifies a normally open contact.  
8. 620 Ohm, 1 watt, 5% resistor should be removed only when using differential enthalpy or dry bulb.  
9. If a separate field supplied 24 v transformer is used for the IAQ sensor power supply, it cannot have the secondary of the transformer grounded.  
10. OAT sensor is shipped inside unit and must be relocated in the field for proper operation.  
11. For field installed remote minimum position POT. remove black wire jumper between P and P1 and set control minimum position POT to the mini-  
mum position.  
50  
2. Ensure terminals AQ and AQ1 are open. The LED for  
both DCV and Exhaust should be off. The actuator  
should be fully closed.  
3. Connect a 9-v battery to AQ (positive node) and AQ1  
(negative node). The LED for both DCV and Exhaust  
should turn on. The actuator should drive to between 90  
and 95% open.  
4. Turn the Exhaust potentiometer CW until the Exhaust  
LED turns off. The LED should turn off when the  
potentiometer is approximately 90%. The actuator should  
remain in position.  
TROUBLESHOOTING  
Unit Troubleshooting — Refer to Tables 27-29 and  
Fig. 59.  
EconoMi$erIV Troubleshooting — See Table 30  
for EconoMi$er IV logic.  
A functional view of the EconoMi$erIV is shown in  
Fig. 60. Typical settings, sensor ranges, and jumper positions  
are also shown. An EconoMi$erIV simulator program is  
available from Carrier to help with EconoMi$erIV training and  
troubleshooting.  
5. Turn the DCV set point potentiometer CW until the DCV  
LED turns off. The DCV LED should turn off when the  
potentiometer is approximately 9 v. The actuator should  
drive fully closed.  
ECONOMI$ERIV PREPARATION — This procedure is  
used to prepare the EconoMi$erIV for troubleshooting. No  
troubleshooting or testing is done by performing the following  
procedure.  
6. Turn the DCV and Exhaust potentiometers CCW until  
the Exhaust LED turns on. The exhaust contacts will  
close 30 to 120 seconds after the Exhaust LED turns on.  
NOTE: This procedure requires a 9-v battery, 1.2 kilo-ohm  
resistor, and a 5.6 kilo-ohm resistor which are not supplied  
with the EconoMi$erIV.  
7. Return EconoMi$erIV settings and wiring to normal  
after completing troubleshooting.  
DCV MINIMUM AND MAXIMUM POSITION — To check  
the DCV minimum and maximum position:  
1. Make sure EconoMi$erIV preparation procedure has  
been performed.  
2. Connect a 9-v battery to AQ (positive node) and AQ1  
(negative node). The DCV LED should turn on. The  
actuator should drive to between 90 and 95% open.  
3. Turn the DCV Maximum Position potentiometer to mid-  
point. The actuator should drive to between 20 and 80%  
open.  
4. Turn the DCV Maximum Position potentiometer to fully  
CCW. The actuator should drive fully closed.  
5. Turn the Minimum Position potentiometer to midpoint.  
The actuator should drive to between 20 and 80% open.  
6. Turn the Minimum Position Potentiometer fully CW. The  
actuator should drive fully open.  
IMPORTANT: Be sure to record the positions of all poten-  
tiometers before starting troubleshooting.  
1. Disconnect power at TR and TR1. All LEDs should be  
off. Exhaust fan contacts should be open.  
2. Disconnect device at P and P1.  
3. Jumper P to P1.  
4. Disconnect wires at T and T1. Place 5.6 kilo-ohm resistor  
across T and T1.  
5. Jumper TR to 1.  
6. Jumper TR to N.  
7. If connected, remove sensor from terminals SO and +.  
Connect 1.2 kilo-ohm 4074EJM checkout resistor across  
terminals SO and +.  
8. Put 620-ohm resistor across terminals SR and +.  
9. Set minimum position, DCV set point, and exhaust  
potentiometers fully CCW (counterclockwise).  
10. Set DCV maximum position potentiometer fully CW  
(clockwise).  
11. Set enthalpy potentiometer to D.  
7. Remove the jumper from TR and N. The actuator should  
drive fully closed.  
8. Return EconoMi$erIV settings and wiring to normal  
after completing troubleshooting.  
12. Apply power (24 vac) to terminals TR and TR1.  
DIFFERENTIAL ENTHALPY — To check differential  
enthalpy:  
1. Make sure EconoMi$erIV preparation procedure has  
been performed.  
2. Place 620-ohm resistor across SO and +.  
3. Place 1.2 kilo-ohm resistor across SR and +. The Free  
Cool LED should be lit.  
4. Remove 620-ohm resistor across SO and +. The Free  
Cool LED should turn off.  
5. Return EconoMi$erIV settings and wiring to normal  
after completing troubleshooting.  
SUPPLY-AIR INPUT — To check supply-air input:  
1. Make sure EconoMi$erIV preparation procedure has  
been performed.  
2. Set the Enthalpy potentiometer to A. The Free Cool LED  
turns on. The actuator should drive to between 20 and  
80% open.  
3. Remove the 5.6 kilo-ohm resistor and jumper T to T1.  
The actuator should drive fully open.  
4. Remove the jumper across T and T1. The actuator should  
drive fully closed.  
5. Return EconoMi$erIV settings and wiring to normal  
after completing troubleshooting.  
SINGLE ENTHALPY — To check single enthalpy:  
ECONOMI$ERIV TROUBLESHOOTING COMPLE-  
TION — This procedure is used to return the EconoMi$erIV  
to operation. No troubleshooting or testing is done by perform-  
ing the following procedure.  
1. Make sure EconoMi$erIV preparation procedure has  
been performed.  
2. Set the enthalpy potentiometer to A (fully CCW). The  
Free Cool LED should be lit.  
1. Disconnect power at TR and TR1.  
2. Set enthalpy potentiometer to previous setting.  
3. Set the enthalpy potentiometer to D (fully CW). The Free  
Cool LED should turn off.  
4. Return EconoMi$erIV settings and wiring to normal  
after completing troubleshooting.  
3. Set DCV maximum position potentiometer to previous  
setting.  
4. Set minimum position, DCV set point, and exhaust  
potentiometers to previous settings.  
DCV (Demand Controlled Ventilation) AND POWER  
EXHAUST — To check DCV and Power Exhaust:  
5. Remove 620-ohm resistor from terminals SR and +.  
1. Make sure EconoMi$erIV preparation procedure has  
been performed.  
6. Remove 1.2 kilo-ohm checkout resistor from terminals  
SO and +. If used, reconnect sensor from terminals SO and  
+.  
51  
7. Remove jumper from TR to N.  
8. Remove jumper from TR to 1.  
9. Remove 5.6 kilo-ohm resistor from T and T1. Reconnect  
wires at T and T1.  
10. Remove jumper from P to P1. Reconnect device at P and  
P1.  
11. Apply power (24 vac) to terminals TR and TR1.  
Table 27 — Cooling Service Analysis  
PROBLEM  
CAUSE  
REMEDY  
Compressor and  
Condenser Fan  
Will Not Start.  
Power failure.  
Fuse blown or circuit breaker tripped.  
Defective thermostat, contactor, transformer, or control  
relay.  
Call power company.  
Replace fuse or reset circuit breaker.  
Replace component.  
Insufficient line voltage.  
Incorrect or faulty wiring.  
Thermostat setting too high.  
Determine cause and correct.  
Check wiring diagram and rewire correctly.  
Lower thermostat setting below room temperature.  
Compressor Will Not  
Start but Condenser Fan  
Runs.  
Faulty wiring or loose connections in compressor circuit. Check wiring and repair or replace.  
Compressor motor burned out, seized, or internal over- Determine cause. Replace compressor.  
load open.  
Defective overload.  
Determine cause and replace.  
Compressor locked out  
One leg of 3-phase power dead.  
Determine cause for safety trip and reset lockout.  
Replace fuse or reset circuit breaker.  
Determine cause.  
Compressor Cycles  
(other than normally  
satisfying thermostat).  
Refrigerant overcharge or undercharge.  
Recover refrigerant, evacuate system, and recharge  
to nameplate.  
Defective compressor.  
Insufficient line voltage.  
Blocked condenser.  
Defective overload.  
Defective thermostat.  
Faulty condenser-fan motor.  
Restriction in refrigerant system.  
Dirty air filter.  
Unit undersized for load.  
Thermostat set too low.  
Low refrigerant charge.  
Air in system.  
Condenser coil dirty or restricted.  
Dirty air filter.  
Replace and determine cause.  
Determine cause and correct.  
Determine cause and correct.  
Determine cause and replace.  
Replace thermostat.  
Replace.  
Locate restriction and remove.  
Replace filter.  
Decrease load or increase unit size.  
Reset thermostat.  
Locate leak, repair, and recharge.  
Recover refrigerant, evacuate system, and recharge.  
Clean coil or remove restriction.  
Replace filter.  
Compressor Operates  
continuously.  
Excessive Head  
Pressure.  
Dirty condenser coil.  
Refrigerant overcharged.  
Faulty TXV.  
Clean coil.  
Recover excess refrigerant.  
1. Check TXV bulb mounting and secure tightly to  
suction line.  
2. Replace TXV if stuck open or closed.  
Air in system.  
Recover refrigerant, evacuate system, and recharge.  
Determine cause and correct.  
Check for leaks, repair, and recharge.  
Remove restriction.  
Condenser air restricted or air short-cycling.  
Low refrigerant charge.  
Restriction in liquid tube.  
High heat load.  
Head Pressure Too Low.  
Excessive Suction  
Pressure.  
Check for source and eliminate.  
Faulty TXV.  
1. Check TXV bulb mounting and secure tightly to  
suction line.  
2. Replace TXV if stuck open or closed.  
Refrigerant overcharged.  
Dirty air filter.  
Low refrigerant charge.  
Metering device or low side restricted.  
Faulty TXV.  
Recover excess refrigerant.  
Replace filter.  
Check for leaks, repair, and recharge.  
Remove source of restriction.  
1. Check TXV bulb mounting and secure tightly to  
suction line.  
2. Replace TXV if stuck open or closed.  
Suction Pressure Too  
Low.  
Insufficient evaporator airflow.  
Increase air quantity. Check filter and replace if  
necessary.  
Temperature too low in conditioned area.  
Field-installed filter drier restricted.  
Reset thermostat.  
Replace.  
LEGEND  
TXV — Thermostatic Expansion Valve  
52  
Table 28 — Heating Service Analysis  
PROBLEM  
CAUSE  
REMEDY  
Burners Will Not  
Ignite.  
Misaligned spark electrodes.  
Check flame ignition and sensor electrode positioning.  
Adjust as needed.  
No gas at main burners.  
Check gas line for air; purge as necessary. After purging  
gas line of air, allow gas to dissipate for at least 5 min-  
utes before attempting to relight unit.  
Check gas valve.  
Water in gas line.  
No power to furnace.  
Drain water and install drip leg to trap water.  
Check power supply, fuses, wiring, and circuit breaker.  
No 24 v power supply to control circuit.  
Check transformer. Transformers with internal overcur-  
rent protection require a cool-down period before  
resetting. Check 24-v circuit breaker; reset if necessary.  
Miswired or loose connections.  
Burned-out heat anticipator in thermostat.  
Broken thermostat wires.  
Check all wiring and wire nut connections.  
Replace thermostat.  
Run continuity check. Replace wires if necessary.  
Clean or replace filter as necessary.  
Check gas pressure at manifold. Clock gas meter for  
input. If too low, increase manifold pressure or replace  
with correct orifices.  
Inadequate Heating. Dirty air filter.  
Gas input to unit too low.  
Unit undersized for application.  
Restricted airflow.  
Replace with proper unit or add additional unit.  
Clean filter, replace filter, or remove any restrictions.  
Blower speed too low.  
Install alternate motor, if applicable, or adjust pulley to  
increase fan speed.  
Limit switch cycles main burners.  
Too much outdoor air.  
Check rotation of blower, thermostat heat anticipator set-  
tings, and temperature rise of unit. Adjust as needed.  
Adjust minimum position.  
Check economizer operation.  
Poor Flame  
Characteristics.  
Incomplete combustion (lack of combustion air)  
results in:  
Check all screws around flue outlets and burner com-  
partment. Tighten as necessary.  
Aldehyde odors, CO, sooting flame, or floating flame.  
Cracked heat exchanger.  
Overfired unit — reduce input, change orifices, or adjust  
gas line or manifold pressure.  
Check vent for restriction. Clean as necessary.  
Check orifice to burner alignment.  
Burners Will Not Turn Unit is locked into Heating mode for a one minute  
Off. minimum.  
Wait until mandatory one minute time period has  
elapsed or power to unit.  
LEGEND  
GR — Ground  
Table 29 — MoistureMi$er™ Dehumidification Subcooler Service Analysis  
PROBLEM  
Subcooler Will Not Energize  
CAUSE  
REMEDY  
No power to subcooler control transformer.  
Check power source. Ensure all wire connections  
are tight.  
No power from subcooler control transformer to  
liquid line three-way valve.  
1. Fuse open; check fuse. Ensure continuity of wiring.  
2. Subcooler control low-pressure switch open.  
Cycle unit off and allow low-pressure switch  
to reset. Replace switch if it will not close.  
3. Transformer bad; check transformer.  
Liquid line three-way valve will not operate.  
1. Solenoid coil defective; replace.  
2. Solenoid valve stuck closed; replace.  
Subcooler Will Not Deenergize Liquid Line three-way valve will not close.  
Valve is stuck open; replace.  
Low System Capacity  
Low refrigerant charge or frosted coil.  
1. Check charge amount. See system charging  
section.  
2. Evaporator coil frosted; check and replace  
subcooler control low-pressure switch if necessary.  
53  
Table 30 — EconoMi$erIV Input/Output Logic  
INPUTS  
Outdoor  
OUTPUTS  
N Terminal†  
Occupied  
Enthalpy*  
Compressor  
Stage Stage  
Demand Control  
Ventilation (DCV)  
Y1 Y2  
Unoccupied  
Return  
1
2
Damper  
Closed  
Below set  
(DCV LED Off)  
High  
Low  
On On  
On Off  
Off Off  
On On  
On Off  
Off Off  
On On  
On Off  
Off Off  
On On  
On Off  
Off Off  
On  
On  
Off  
On  
Off  
Off  
On  
On  
Off  
On  
Off  
Off  
On  
Off  
Off  
Off  
Off  
Off  
On  
Off  
Off  
Off  
Off  
Off  
Minimum position  
(Free Cooling LED Off)  
Low  
High  
Low  
High  
Modulating** (between min.  
position and full-open)  
Modulating** (between  
closed and full-open)  
(Free Cooling LED On)  
Minimum position  
Closed  
Above set  
(DCV LED On)  
High  
Modulating†† (between min. Modulating†† (between  
position and DCV maximum) closed and DCV  
maximum)  
(Free Cooling LED Off)  
Low  
Modulating***  
Modulating†††  
(Free Cooling LED On)  
*For single enthalpy control, the module compares outdoor  
enthalpy to the ABCD set point.  
†Power at N terminal determines Occupied/Unoccupied setting:  
24 vac (Occupied), no power (Unoccupied).  
**Modulation is based on the supply air sensor signal.  
††Modulation is based on the DCV signal.  
***Modulation is based on the greater of DCV and supply-air sen-  
sor signals, between minimum position and either maximum  
position (DCV) or fully open (supply-air signal).  
†††Modulation is based on the greater of DCV and supply-air  
sensor signals, between closed and either maximum position  
(DCV) or fully open (supply-air signal).  
54  
LEGEND  
IGC — Integrated Gas Unit Controller  
NOTE: Thermostat Fan Switch in the “AUTO”  
position.  
Fig. 59 — IGC Control (Heating and Cooling)  
55  
Fig. 60 — EconoMi$erIV Functional View  
56  
INDEX  
Air quality limits 40  
Altitude compensation 12  
Burner section 12  
Burner spark gap 47  
Carrier Comfort Network® 19  
Charging chart, refrigerant 45  
Clearance 6-8  
Manual outdoor air damper 16  
MoistureMi$er dehumidification  
package 31, 32, 45, 53  
MotorMaster® I control 17  
Motormaster V control 18  
Mounting  
Compressor 33  
CO2 sensor  
Unit  
2
Configuration 30  
Settings 29, 30  
Natural gas 10  
Non-fused disconnect 14  
Operating limits 18  
Operating sequence 41-43  
Cooling 41-43  
Combustion blower wheel 43  
Compressor  
Lockout 25, 46  
Lubrication 43  
EconoMi$erIV 41  
EconoMi$er2 with  
PremierLink control 41-43  
Heating 41-43  
Mounting 33  
Rotation 33  
Concentric duct 11  
Condensate drain  
Outdoor air hood 16  
Outdoor air temperature sensor 19, 25  
Outdoor air inlet screens  
Cleaning 43  
Cleaning 43  
Location 11, 12  
Condenser coil  
Cleaning 43  
Condenser fan  
9
Dimensions 10  
9
Physical data 9, 10  
Power supply 13  
Wiring 13  
Adjustment 45  
Control circuit 46  
Wiring 13  
PremierLink controls 19-22  
Pressure, drop  
EconoMi$erIV 40  
MoistureMi$er 40  
Pressure switches  
Convenience outlet 14  
Crankcase heater 33, 46  
Demand control ventilation 28  
Dehumidification 30  
Dimensions 3, 4, 6-8  
Ductwork 11  
High pressure 10  
Low pressure 10  
Refrigerant  
EconoMi$erIV 24-30  
Control mode 27  
Charge 45  
Controller wiring 26  
Damper movement 28  
Demand ventilation control 28  
Troubleshooting 51, 52, 54  
Usage 27  
Type  
9
Refrigerant service ports 33  
Replacement parts 46  
Return air filter 10, 33  
Return air temperature sensor 27  
Rigging unit 2, 5  
Wiring 26  
EconoMi$er2 24-26  
Electrical connections 13  
Electrical data 15  
Roof curb  
Assembly  
2
Dimensions 3, 4  
Enthalpy changeover set points 29  
Error codes 47, 55  
Leveling tolerances 2-4  
Safety considerations  
Service 43-50  
1
Evaporator coil  
Cleaning 43  
9
Service ports 33  
Start-up 33-43  
Evaporator fan motor  
Efficiency 40  
Start-up checklist CL-1  
Supply-air temperature sensor 19, 25  
Thermostat 14, 28  
Troubleshooting 51-56  
Weight  
Corner 6-8  
EconoMi$erIV 6-9  
Lubrication 44  
Motor data 40  
Performance 34-39  
Pulley adjustment 44  
Pulley setting 9, 40  
Speed  
Filter  
9
Maximum  
5
Cleaning 43  
MoistureMi$er  
9
Size 10  
Filter drier 46  
Unit 6-9  
Wind baffle 11, 17, 18  
Wiring  
4 to 20 mA control 24  
EconoMi$erIV 26  
EconoMi$er2 26  
Humidistat 31  
Flue collector box 43  
Flue gas passageways 43  
Flue hood 11  
Freeze protection thermostat 10, 46  
Gas connection 10  
Gas input 10  
Power connections 13  
PremierLink 20  
Thermostat 14  
Gas piping 13, 33  
Gas pressure 1, 10  
Heat anticipator settings 10, 13  
High-pressure switch 10, 46  
Hinged access doors 47  
Unit 48, 49  
Horizontal adapter roof curb  
Humidistat 31  
2
Indoor air quality sensor 19  
Integrated gas controller  
Error codes 55  
Liquid propane 10, 12  
Low-pressure switch 10, 46  
Main burners 43, 46  
57  
SERVICE TRAINING  
Packaged Service Training programs are an excellent way to increase your knowledge of the equipment  
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 formats  
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 1-800-644-5544  
[
] Packaged Service Training  
[
] Classroom Service Training  
Copyright 2006 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Catalog No. 04-53480016-01 Printed in U.S.A. Form 48TM-4SI Pg 58 3-06 Replaces: 48TM-3SI  
Book 1  
4
Tab 1a 6a  
START-UP CHECKLIST  
MODEL NO.:  
DATE:  
SERIAL NO.:  
TECHNICIAN:  
PRE-START-UP  
VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT  
VERIFY INSTALLATION OF INDOOR FAN MOTOR ADJUSTMENT BOLT AND PLATE  
VERIFY INSTALLATION OF OUTDOOR-AIR HOOD  
VERIFY INSTALLATION OF FLUE HOOD AND WIND BAFFLE  
VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS  
VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT  
CHECK GAS PIPING FOR LEAKS  
CHECK THAT FILTERS AND SCREENS ARE CLEAN AND IN PLACE  
VERIFY THAT UNIT IS LEVEL  
CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE, AND VERIFY SETSCREW  
IS TIGHT  
VERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED  
VERIFY THAT SCROLL COMPRESSOR IS ROTATING IN THE CORRECT DIRECTION  
VERIFY THAT CRANKCASE HEATER HAS BEEN ENERGIZED FOR 24 HOURS  
START-UP  
ELECTRICAL  
SUPPLY VOLTAGE  
L1-L2  
L1  
L2-L3  
L2  
L3-L1  
L3  
COMPRESSOR AMPS — COMPRESSOR NO. 1  
— COMPRESSOR NO. 2  
L1  
L2  
L3  
SUPPLY FAN AMPS  
EXHAUST FAN AMPS  
TEMPERATURES  
OUTDOOR-AIR TEMPERATURE  
RETURN-AIR TEMPERATURE  
COOLING SUPPLY AIR  
F DB (Dry-Bulb)  
F DB  
F WB (Wet-Bulb)  
F
F
GAS HEAT SUPPLY AIR  
PRESSURES  
GAS INLET PRESSURE  
IN. WG  
GAS MANIFOLD PRESSURE STAGE NO. 1  
IN. WG  
PSIG  
PSIG  
STAGE NO. 2  
CIRCUIT NO. 2  
CIRCUIT NO. 2  
IN. WG  
PSIG  
PSIG  
REFRIGERANT SUCTION  
CIRCUIT NO. 1  
REFRIGERANT DISCHARGE CIRCUIT NO. 1  
VERIFY REFRIGERANT CHARGE USING CHARGING CHART ON PAGE 45.  
GENERAL  
ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS  
Copyright 2006 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book  
1
4
Catalog No. 04-53480016-01  
Printed in U.S.A.  
Form 48TM-4SI  
Pg CL-1  
3-06  
Replaces: 48TM-3SI  
Tab  
1a 6a  

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