50EJ,EK,EW,EY024-048
Single-Package Rooftop Units
Electric Cooling with Electric Heat Option
Installation, Start-Up and
Service Instructions
CONTENTS
IMPORTANT — READ BEFORE INSTALLING
Page
IMPORTANT: Due to upgrades in unit control soft-
ware and hardware, units produced currently are slightly
different than original design units. The unit control
software (which has changed) is designated with a sticker
on the unit control board, chip U8 (the large chip in
the center of the board), which states the software Ver-
sion number. Version 1.0 is the original version. Ver-
sion 2.0 is the current version. Differences in instal-
lation, configuration, and start-up procedures in this
manual will be identified by Version number.
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31
Step 1 — Provide Unit Support . . . . . . . . . . . . . . 1
• ROOF CURB
• ALTERNATE UNIT SUPPORT
Step 2 — Rig and Place Unit . . . . . . . . . . . . . . . . . 8
• POSITIONING
• ROOF MOUNT
Step 3 — Field Fabricate Ductwork . . . . . . . . . . . 11
Step 4 — Make Unit Duct Connections . . . . . . . 11
Step 5 — Trap Condensate Drain . . . . . . . . . . . . . 11
Step 6 — Controls Options . . . . . . . . . . . . . . . . . . 12
• CONSTANT VOLUME APPLICATIONS
• VARIABLE AIR VOLUME (VAV)
APPLICATIONS
Step 7 — Make Electrical Connections . . . . . . . 15
• POWER WIRING
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
INSTALLATION
Step 1 — Provide Unit Support
All panels must be in place when rigging. Unit is not
designed for handling by fork truck.
Step 8 — Make Outdoor-Air Inlet
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
• ECONOMIZER
ROOF CURB — Assemble and install accessory roof curb
in accordance with instructions shipped with the curb. Ac-
cessory roof curb and information required to field fabricate
a roof curb or horizontal adapter are shown in Fig. 1 and 2.
Install insulation, cant strips, roofing, and counter flashing
as shown. Ductwork can be secured to roof curb before unit
is set in place.
• ECONOMIZER SETTINGS
Step 9 — Position Power Exhaust/
Barometric Relief Damper Hood . . . . . . . . . . . . . 29
Step 10 — Install Accessories . . . . . . . . . . . . . . . 30
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32-42
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42-45
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 46-51
START-UP CHECKLIST . . . . . . . . . . . . . . . CL-1, CL-2
IMPORTANT: The gasketing of the unit to the roof
curb is critical for a leak-proof seal. Install gasket sup-
plied with the roof curb as shown in Fig. 1. Improp-
erly applied gasket can result in air leaks and poor unit
performance.
SAFETY CONSIDERATIONS
Curb should be level. This is necessary to permit unit drain
to function properly. Unit leveling tolerance is shown in
Fig 1 and 2. Refer to Accessory Roof Curb Installation In-
structions for additional information as required. When ac-
cessory roof curb is used, unit may be installed on class A,
B, or C roof covering material.
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical com-
ponents. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.
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 per-
sonnel. When working on air-conditioning equipment, ob-
serve precautions in the literature, tags and labels attached
to the unit, and other safety precautions that may apply.
ALTERNATE UNIT SUPPORT — When the curb or adapter
cannot be used, support unit with sleepers using unit curb or
adapter support area. If sleepers cannot be used, support long
sides of unit (refer to Fig. 3-6) with a minimum number of
equally spaced 4-in.
x
4-in. pads as follows:
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire ex-
tinguishers available for all brazing operations.
50EJ,EK,EW,EY024-034 units require 3 pads on each side;
50EJ,EK,EW,EY038-048 require 4 pads on each side. Unit
may sag if supported by corners only.
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
PC 111
Catalog No. 535-006
Printed in U.S.A.
Form 50E-3SI
Pg 1
8-96
Replaces: 50E-1SI
Tab 1b
NOTE: To prevent standing water in the drain pan of the indoor section and the
heat exchangers, UNIT CAN ONLY BE PITCHED AS SHOWN.
NOTES:
1. Unless otherwise specified, all dimensions are to out-
side of part.
UNIT LEVELING TOLERANCES DIMENSIONS*
(Degrees and Inches)
2. Roof curb accessory is shipped disassembled.
3. All roof curb parts are to be 16 ga galvanized steel.
4. Dimensions are in inches.
A
B
Deg.
in.
Deg.
in.
1.0
2.9
.50
.75
*From edge of unit to horizontal.
Fig. 2 — Roof Curb (Sizes 038-048)
3
NOTES:
CORNER WEIGHT
(lb)
OPERATING
WEIGHT
(lb)
A
B
UNIT SIZE
50EJ/EK
ft-in.
ft-in.
1
2
3
4
024
028
030
034
4016
4102
4102
4102
5-113⁄8 3-511⁄16 823 914 1199 1080
5- 81⁄2 3-75⁄8
5- 81⁄2 3-75⁄8
5- 81⁄2 3-75⁄8
844 859 1210 1189
844 859 1210 1189
844 859 1210 1189
Fig. 3 — Base Unit Dimensions, 50EJ/EK024-034
4
NOTES:
LEGEND
1. Weights include economizer (Std)
VFD
—
Variable Frequency Drive
2.
Center of gravity.
3. Do not locate adjacent units with discharge facing economizer inlet. Mini-
mum clearances to be:
Adjacent Units: 15Ј-0Љ
Top of Units: No overhang
Condenser Coil: 4Ј-0Љ
Economizer Side: 6Ј-0Љ
Filter Access Side: 10Ј-0Љ (for removal of evaporator coil)
4. For smaller service and operational clearances, contact Carrier Applica-
tion Engineering department.
5. Bottom ducts designed to be attached to accessory roof curb. If unit is
mounted on dunnage, it is recommended the ducts be supported by cross
braces as done on accessory roof curb.
6. Dimensions are in inches. Dimensions in [ ] are in millimeters.
7. For units with electric heat, a field-supplied 90° elbow must be installed
in the supply ductwork below the unit discharge.
CORNER WEIGHT
(lb)
OPERATING
WEIGHT
(lb)
A
B
UNIT SIZE
50E
ft-in.
ft-in.
1
2
3
4
J038
4282
4508
4795
7-75⁄16 3-101⁄2
7-313⁄16 3-111⁄2
7-23⁄16 3-103⁄32 1007 915 1368 1505
961 858 1162 1302
J/K044
J048
973 868 1258 1409
Fig. 4 — Base Unit Dimensions, 50EJ038-048 and 50EK044
5
NOTES:
LEGEND
1. Weights include economizer (Std)
VFD
—
Variable Frequency Drive
2.
Center of gravity.
3. Do not locate adjacent units with discharge facing econo-
mizer inlet. Minimum clearances to be:
Adjacent Units: 15Ј-0Љ
Top of Units: No overhang
Condenser Coil: 4Ј-0Љ
CORNER WEIGHT
(lb)
OPERATING
WEIGHT
(lb)
A
B
UNIT SIZE
50EW/EY
Economizer Side: 6Ј-0Љ
Filter Access Side: 10Ј-0Љ (for removal of evaporator
coil)
ft-in.
ft-in.
1
2
3
4
024
028
030
034
4016
4102
4102
4102
5-113⁄8 3-511⁄16 823 914 1199 1080
4. For smaller service and operational clearances, con-
tact Carrier Application Engineering department.
5. Dimensions are in inches. Dimensions in [ ] are in
millimeters.
6. For units equipped with electric heat, a field-supplied
90° elbow must be installed in the supply ductwork be-
low the unit discharge.
5- 81⁄2 3-75⁄8
5- 81⁄2 3-75⁄8
5- 81⁄2 3-75⁄8
844 859 1210 1189
844 859 1210 1189
844 859 1210 1189
7. For side-supply/return applications, a single return and
supply ductwork connection is recommended for cov-
ering both return and both supply openings.
Fig. 5 — Base Unit Dimensions, 50EW/EY024-034
6
NOTES:
LEGEND
1. Weights include economizer (Std)
VFD
—
Variable Frequency Drive
2.
Center of gravity.
3. Do not locate adjacent units with discharge facing economizer inlet.
Minimum clearances to be:
Adjacent Units: 15Ј-0Љ
Top of Units: No overhang
Condenser Coil: 4Ј-0Љ
Economizer Side: 6Ј-0Љ
CORNER WEIGHT
OPERATING
WEIGHT
(lb)
A
ft-in.
7-75⁄16 3-101⁄2
7-313⁄16 3-111⁄2
B
Filter Access Side: 10Ј-0Љ (for removal of evaporator coil)
4. For smaller service and operational clearances, contact Carrier
Application Engineering department.
UNIT SIZE
50E
(lb)
ft-in.
1
2
3
4
5. Dimensions are in inches. Dimensions in [ ] are in millimeters.
6. For units equipped with electric heat, a field-supplied 90° elbow must
be installed in the supply ductwork below the unit discharge.
7. For side-supply/return applications, a single return and supply duct-
work connection is recommended for covering both return and both
supply air openings.
W038
4282
4508
4795
961 858 1162 1302
W/Y044
W048
973 868 1258 1409
7-23⁄16 3-103⁄32 1007 915 1368 1505
Fig. 6 — Base Unit Dimensions, 50EW038-048 and 50EY044
7
Four lifting lugs are provided on the unit base rails as shown
in Fig. 7. Refer to rigging instructions on unit.
Step 2 — Rig and Place Unit — Inspect unit for trans-
portation damage. File any claim with transportation agency.
Keep unit upright, and do not drop. Use spreader bars over
unit to prevent sling or cable damage. Rollers may be used
to move unit across a roof. Level by using unit frame as a
reference; leveling tolerance is shown in Fig. 1 and 2. See
Fig. 7 for additional information. Unit weight is shown in
Table 1.
NOTE: On retrofit jobs, ductwork may be attached to old
unit instead of roof curb. Be careful not to damage ductwork
when removing unit. Attach existing ductwork to roof curb
instead of unit.
POSITIONING — Provide clearance around and above unit
for airflow, safety, and service access (Fig. 3-6).
Do not install unit in an indoor location. Do not locate air
inlets near exhaust vents or other sources of contaminated
air.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
NOTICE TO RIGGERS:
ALL PANELS MUST BE IN PLACE
WHEN RIGGING.
NOTE: Rig with four cables and spread with two
92 in. (2337 mm) spreader bars. Maintain a dis-
tance of 74 in. (1880 mm) from top of unit to
eyehook.
NOTE:
Add 32 lb (14.5 kg) for domestic crating.
Add 312 lb (142 kg) for export crating (024-034 units).
Add 346 lb (157 kg) for export crating (038-048 units).
Add 250 lb (113 kg) for power exhaust.
Add 220 lb (100 kg) for copper condenser coil (024-034 units).
Add 285 lb (129 kg) for copper condenser coil (038-044 units).
Add 380 lb (172 kg) for copper condenser coil (048 unit).
WEIGHT
lb kg
A
B
C
MODEL
50EJ/EK/EW/EY
in.
mm
in.
mm
in.
mm
024
028
030
034
038*
044
048*
4016 1822 87.68 2227 71.4 1814 41.7 1059
4102 1860 87.68 2227 68.5 1740 43.6 1107
4282 1942
4508 2045
4795 2175
91.3 2319 46.5 1181
3810 87.8 2230 46.5 1181
86.2 2189 46.1 1171
150
*Sizes 038 and 048 are 50EJ,EW units only.
Fig. 7 — Rigging Label
8
Table 1 — Physical Data
UNIT 50EJ,EK,EW,EY
024
028
030
034
NOMINAL CAPACITY (tons)
20
25
27
30
OPERATING WEIGHT (lb)*
Unit
Al/Al†
4016
4236
365
4102
4322
365
4102
4322
365
4102
4322
365
Al/Cu†
Roof Curb (14-in. curb)
COMPRESSOR
Type
Ckt 1
Ckt 2
06D328
06D818
2
06D328
06D328
2
06D537
06D328
2
06D537
06D537
2
Number of Refrigerant Circuits
Oil (oz) (Ckt1, Ckt 2)
115, 88
115 ea.
115 ea.
115 ea.
REFRIGERANT TYPE
Operating Charge (lb-oz)
Circuit 1**
R-22
25-0
31-0
25-0
25-0
25-0
25-0
25-0
25-0
Circuit 2
3
CONDENSER COIL
Quantity
Rows...Fins/in.
Total Face Area (sq ft)
Cross-Hatched
⁄
8Љ Copper Tubes, Aluminum Lanced or Copper Fins
1
1
1
1
4...15
33.3
4...15
33.3
4...15
33.3
4...15
33.3
CONDENSER FAN
Nominal Cfm
Quantity...Diameter (in.)
Motor Hp (1075 Rpm)
Propeller Type
13,420
2...30
1
13,420
2...30
1
13,420
2...30
1
13,420
2...30
1
3
EVAPORATOR COIL
Rows...Fins/in.
Total Face Area (sq ft)
Cross-Hatched ⁄8Љ Copper Tubes, Aluminum or Copper Plate Fins, Intertwined Circuits
4...15
31.7
4...15
31.7
4...15
31.7
4...15
31.7
EVAPORATOR FAN
Centrifugal Type
Quantity...Size (in.)
2...20x15
Belt
2...20x15
Belt
2...20x15
Belt
2..20x15
Belt
Type Drive
Nominal Cfm
8,000
10††
S215T
Ball
10,000
10††
S215T
Ball
11,000
15††
S254T
Ball
12,000
15††
S254T
Ball
Motor Hp
5
15
7.5
15
S254T
10
S215T
20
10
20
Motor Frame Size
S184T
S254T
S213T
S256T
S215T
S256T
Motor Bearing Type
Maximum Allowable Rpm
Motor Pulley Pitch Diameter
Nominal Motor Shaft Diameter (in.)
Fan Pulley Pitch Diameter (in.)
Nominal Fan Shaft Diameter (in.)
Belt, Quantity...Type
1200
6.6
1200
6.1
1200
6.7
1200
6.9
4.6
11⁄8
11.1
6.9
15⁄8
11.1
4.9
13⁄8
11.1
7.1
15⁄8
11.1
6.6
13⁄8
13.7
7.5
15⁄8
11.1
6.4
13⁄8
12.5
7.5
15⁄8
11.1
13⁄8
13⁄8
15⁄8
15⁄8
12.5
11.1
11.1
11.1
111⁄16
111⁄16
111⁄16
111⁄16
1...BX59 1...BX60 1...5VX590 1...BX56 1...BX56 1...5VX590 1...BX62 1...5VX590 1...5VX600 1...BX60 1...5VX590 1...5VX600
Belt, Length (in.)
Pulley Center Line Distance (in.)
Factory Speed Setting (rpm)
62
63
59
59
59
59
65
59
60
63
15.6-18.4
896
59
60
16.0-18.7 15.6-18.4 15.0-17.9 15.6-18.4 15.6-18.4 15.0-17.9 15.6-18.4
15.0-17.9
15.0-17.9
725
924
1088
773
962
1119
843
1056
1182
1088
1182
HIGH-PRESSURE SWITCH (psig)
Cutout
Reset (Auto.)
426
320
426
320
426
320
426
320
LOW-PRESSURE SWITCH (psig)
Cutout
Reset (Auto.)
7
22
7
22
7
22
7
22
RETURN-AIR FILTERS
Quantity...Size (in.)
10...20x24x2
10...20x24x2
10...20x24x2
10...20x24x2
OUTDOOR-AIR FILTERS
Quantity...Size (in.)
8...16x25
4...20x25
8...16x25
4...20x25
8...16x25
4...20x25
8...16x25
4...20x25
POWER EXHAUST
Motor, Quantity...Hp
Fan, Diameter...Width (in.)
Direct Drive, 3-Speed, Single-Phase Motor (Factory-Wired For High Speed) and Forward Curved Fan
4...1
11...10
NOTES:
LEGEND
1. See Table 2 for evaporator fan motor data.
2. Sizes 038 and 048 are 50EJ,EW units only.
Al
Cu
—
—
Aluminum
Copper
*Weight of unit does not include variable frequency drive (VFD), barometric relief, or power
exhaust. If a VAV unit (a VFD is installed), add the VFD weight in the table at right.
†Evaporator coil fin material/condenser coil fin material.
**Sizes 024-034: Circuit 1 uses the lower portion of condenser coil, Circuit 2 uses the upper
portion. Sizes 038-048: Circuit 1 uses the left condenser coil, Circuit 2 the right. All units
have intertwined evaporator coils.
††Motor and drive shown will deliver approximately 2.5 in. wg net external static. For more
drive information, see Table 2.
VFD WEIGHTS (lb)
VFD
(Hp)
208/230 v
460 v
22
575 v
5
20
51
60
64
7.5
10
15
20
25
30
37
51
61
64
61
63
109
109
174
180
63
111
112
118
105
172
9
Table 1 — Physical Data (cont)
UNIT 50EJ,EK,EW,EY
038
044
048
NOMINAL CAPACITY (tons)
35
40
45
OPERATING WEIGHT (lb)*
Unit
Al/Al†
4282
4567
410
4508
4793
410
4795
5175
410
Al/Cu†
Roof Curb (14-in. curb)
COMPRESSOR
Type
Ckt 1
Ckt 2
06D537
06D537
2
06EA250
06EA250
2
06EA265
06EA250
2
Number of Refrigerant Circuits
Oil (oz) (Ckt1, Ckt 2)
115 ea.
224 ea.
304, 224
REFRIGERANT TYPE
Operating Charge (lb-oz)
Circuit 1**
R-22
34-0
34-0
35-0
35-0
41-0
41-0
Circuit 2
3
CONDENSER COIL
Quantity
Rows...Fins/in.
Total Face Area (sq ft)
Cross-Hatched
⁄
8Љ Copper Tubes, Aluminum Lanced or Copper Fins
2
2
1
1
3...15
58.3
3...15
58.3
4...15
3...15
66.7
CONDENSER FAN
Nominal Cfm
Quantity...Diameter (in.)
Motor Hp (1075 Rpm)
Propeller Type
27,064
4...30
1
27,064
4...30
1
27,064
4...30
1
3
EVAPORATOR COIL
Rows...Fins/in.
Total Face Area (sq ft)
Cross-Hatched
⁄
8Љ Copper Tubes, Aluminum or Copper Plate Fins, Intertwined Circuits
3...15
34.7
3...15
34.7
4...15
34.7
EVAPORATOR FAN
Centrifugal Type
2...20x15
Belt
Quantity...Size (in.)
2..20x15
Belt
2...20x15
Belt
Type Drive
Nominal Cfm
14,000
15††
S254T
Ball
16,000
18,000
25††
Motor Hp
10
20
15
20††
S256T
Ball
25
20
30
S286T
Motor Frame Size
S215T
S256T
S254T
S284T
S256T
S284T
Ball
Motor Bearing Type
Maximum Allowable Rpm
Motor Pulley Pitch Diameter
Nominal Motor Shaft Diameter (in.)
Fan Pulley Pitch Diameter (in.)
Nominal Fan Shaft Diameter (in.)
Belt, Quantity...Type
1200
6.9
1200
8.1
1200
4.1
13⁄8
9.1
7.5
15⁄8
12.5
6.9
15⁄8
12.5
9.1
11⁄8
13.7
5.3
15⁄8
9.1
5.9
7.5
17⁄8
11.1
15⁄8
15⁄8
17⁄8
12.5
13.7
9.1
111⁄16
1...5VX630
63
111⁄16
1...5VX670
67
111⁄16
1...BX51
54
15.6-18.4
788
1...5VX650
65
1...5VX630
63
2...5VX680
68
14.6-17.6
1162
1...5VX550
55
15.0-17.9
1019
2...5VX560
56
2...5VX610
59
14.6-17.6
1182
Belt, Length (in.)
Pulley Center Line Distance (in.)
Factory Speed Setting (rpm)
15.0-17.9
15.0-17.9
14.6-17.6
1135
966
1050
1066
1035
HIGH-PRESSURE SWITCH (psig)
Cutout
Reset (Auto.)
426
320
426
320
426
320
LOW-PRESSURE SWITCH (psig)
Cutout
Reset (Auto.)
7
22
7
22
7
22
RETURN-AIR FILTERS
Quantity...Size (in.)
10...20x24x2
10...20x24x2
10..20x24x2
OUTDOOR-AIR FILTERS
Quantity...Size (in.)
8...16x25
4...20x25
8...16x25
4...20x25
8...16x25
4...20x25
POWER EXHAUST
Motor, Quantity...Hp
Fan, Diameter...Width (in.)
Direct Drive, 3-Speed, Single-Phase Motor (Factory-Wired For High Speed) and Forward Curved Fan
4...1
11...10
NOTES:
LEGEND
1. See Table 2 for optional evaporator fan motor data.
2. Sizes 038 and 048 are 50EJ,EW units only.
Al
Cu
—
—
Aluminum
Copper
*Weight of unit does not include variable frequency drive (VFD), barometric relief, or power
exhaust. If a VAV unit (a VFD is installed), add the VFD weight in the table at right.
†Evaporator coil fin material/condenser coil fin material.
**Sizes 024-034: Circuit 1 uses the lower portion of condenser coil, Circuit 2 uses the upper
portion. Sizes 038-048: Circuit 1 uses the left condenser coil, Circuit 2 the right. All units
have intertwined evaporator coils.
††Motor and drive shown will deliver approximately 2.5 in. wg net external static. For more
drive information, see Table 2.
VFD WEIGHTS (lb)
VFD
(Hp)
208/230 v
460 v
22
575 v
60
5
20
51
7.5
10
15
20
25
30
37
64
51
61
64
61
63
109
109
174
180
63
111
112
118
105
172
10
Table 2 — Evaporator Fan Motor Data
MOTOR
SHEAVE
PITCH
DIAMETER
(in.)
FAN
SHEAVE
PITCH
DIAMETER
(in.)
MOTOR
SHAFT
FAN
BELT
TENSION
(Lb @
BUSHING
DIAMETER
(in.)
BUSHING
DIAMETER
(in.)
OUTSIDE
BELT
LENGTH
UNIT MOTOR
SHAFT
MOTOR
FAN
SHEAVE
BELT
SIZE
HP
DIAMETER SPEED SHEAVE
(in.)
(rpm)
.24 in.)
5
10
15
1.12
1.38
1.62
725
924
BK52
BK72
4.6
6.6
6.9
None-1.125 1B5V110
None-1.375 1B5V124
11.1
12.5
11.1
B-1.6875
B-1.6875
B-1.6875
BX59
BX60
62
63
59
5.02
7.05
9.38
024
028
030
034
038
044
048
1088
1B5V68
B-1.625
1B5V110
5VX590
7.5
10
15
1.38
1.38
1.62
773
962
1119
BK55H
BK67H
1B5V70
4.9
6.1
7.1
H-1.375
H-1.375
B-1.625
1B5V110
1B5V110
1B5V110
11.1
11.1
11.1
B-1.6875
B-1.6875
B-1.6875
BX56
BX56
5VX590
59
59
59
6.87
7.26
9.17
10
15
20
1.38
1.62
1.62
843
1056
1182
BK72
1B5V66
1B5V74
6.6
6.7
7.5
None-1.375 1B5V136
13.7
11.1
11.1
B-1.6875
B-1.6875
B-1.6875
BX62
5VX590
5VX600
65
59
60
6.96
9.60
11.67
B-1.625
B-1.625
1B5V110
1B5V110
10
15
20
1.38
1.62
1.62
896
1088
1182
BK70H
1B5V68
1B5V74
6.4
6.9
7.5
H-1.375
B-1.625
B-1.625
1B5V124
1B5V110
1B5V110
12.5
11.1
11.1
B-1.6875
B-1.6875
B-1.6875
BX60
5VX590
5VX600
63
59
60
7.20
9.38
11.17
10
15
20
1.38
1.62
1.62
788
966
1050
2BK47
1B5V68
1B5V74
4.1
6.9
7.5
None-1.375
B-1.625
B-1.625
2B5V90
1B5V124
1B5V124
9.1
12.5
12.5
B-1.6875
B-1.6875
B-1.6875
BX51
5VX630
5VX650
54
63
65
5.49
9.22
10.02
15
20
25
1.62
1.62
1.88
966
1035
1162
1B5V68
1B5V80
1B5V90
6.9
8.1
9.1
B-1.625
B-1.625
B-1.875
1B5V124
1B5V136
1B5V136
12.5
13.7
13.7
B-1.6875
B-1.6875
B-1.6875
5VX630
5VX670
5VX680
63
67
68
9.54
10.37
10.88
20
25
30
1.62
1.88
1.88
1019
1135
1182
2B5V52
2B5V58
2B5V76
5.3
5.9
7.5
B-1.625
B-1.875
B-1.875
2B5V90
2B5V90
2B5V110
9.1
9.1
11.1
B-1.6875
B-1.6875
B-1.6875
5VX550
5VX560
5VX610
55
56
59
7.93
8.66
9.07
NOTE: Motor shaft speed is 1750 rpm. The fan shaft diameter is 111⁄16 inches.
ROOF MOUNT — Check building codes for weight distri-
bution requirements.
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
insulated and covered with a vapor barrier.
To attach ductwork to roof curb, insert ductwork approxi-
mately 10 to 11 in. up into the curb. Connect ductwork to
14-gage roof curb material using sheet metal screw driven
from inside the duct.
The units with electric heat require a 1-in. clearance for
the first 24 in. of ductwork.
NOTE: A 90-degree elbow must be provided in the duct-
work to comply with UL (Underwriters’Laboratories) codes
for use with electric heat.
Fig. 8 — Air Distribution — Thru-the-Bottom
Outlet grilles must not lie directly below unit discharge.
Step 4 — Make Unit Duct Connections
50EJ,EK UNITS — Unit is shipped for through-the-bottom
duct connections. Ductwork openings are shown in Fig. 3
and 4. Attach all ductwork to roof curb. Air distribution
is shown in Fig. 8. Refer to installation instructions shipped
with accessory roof curb for more information.
50EW,EY UNITS — Remove shipping covers from supply
and return air openings. Attach field-supplied ductwork to
unit. Use a single duct over both return openings and a single
duct over both supply openings. See Fig. 5 and 6 for duct
opening dimensions. Secure all ducts to the building struc-
ture. See Fig. 9. Use flexible duct connectors between unit
and ducts as required.
Install accessory barometric relief or power exhaust in the
field-fabricated return ductwork. Refer to Position Power
Exhaust/Barometric Relief Damper Hood Section on
page 29 for more information.
Fig. 9 — Air Distribution — Thru-the-Side
the drain location. One 1-in. FPT coupling is provided in-
side unit evaporator section for condensate drain connec-
tion. A trap at least 4-in. deep must be used. Trap must be
installed to prevent freeze-up.
Condensate pans are sloped so that water will completely
drain from the condensate pan to comply with indoor air qual-
ity guidelines.
Step 5 — Trap Condensate Drain — See Fig. 3-6
and 10 for drain location. Condensate drain is open to the
atmosphere and must be trapped. Install a trapped drain at
11
• control of modulating economizer damper to provide free
cooling when outdoor conditions are suitable, using sup-
ply air temperature as a control point
• control of the economizer damper and indoor fan to obtain
unoccupied free cooling
• provide power exhaust output to an external power ex-
haust controller
• support a field test for field checkout
• control of 2 stages of CV power exhaust
• compressor Time Guard (power up and minimum off and
on times)
Additional features are provided by accessing the stand-
ard unit control board via software with a computer. These
features are:
• electronic expansion board features (if installed)
• compressor lockout during low supply air temperature
• control board diagnostics
• ability to change supply air set point (economizer control)
• ability to change high outdoor air temperature lockout set
point (economizer control)
Fig. 10 — Condensate Drain Connections
(Typical Roof Curb or Slab Mount Shown)
• ability to change power exhaust set points
Step 6 — Controls Options — The control options
that the units can provide are based on the following param-
eters: CV (constant volume) or VAV (variable air volume)
operation; stand-alone unit with field-supplied sensors in-
stalled (CV or VAV); as a system via the Carrier Comfort
System (TEMP or VVT); optional electronic expansion board
installed (CV or VAV); linked to the Carrier Comfort Net-
work; and availability of a computer and software (Comfort
Works, Building Supervisor, and Service Tool) to access the
base control board. See Table 3.
NOTE: A CV unit without a thermostat requires a field-
supplied sensor for operation.
Features with Sensor Control of Unit (Stand-Alone Appli-
cations — Unit control is limited to CV unoccupied default
set points, 90 F for cooling, 55 F for heating. There are
3 sensor options available:
• T-57 sensor will monitor room temperature
• T-55 sensor will monitor room temperature and provide
unoccupied override capability (1 hour)
• T-56 sensor will monitor room temperature, provide un-
occupied override capability (1 hour), and provide a tem-
perature offset of 5° F.
NOTE: Access to the base control board allows unit occu-
pancy schedules, unit timeclock, and various set points to be
changed from their factory-defined default settings.
Standard features are:
• support of remote occupied/unoccupied input to start and
stop the unit
• cooling capacity control of 3 stages using economizer and
2 compressors to maintain space temperature to an occu-
pied or unoccupied set point
• enable heating (if installed) or cooling during unoccupied
periods as required to maintain space temperature within
the unoccupied set points
• adjustment of space temperature set points of ± 5° F when
using a T-56 sensor
CONSTANT VOLUME APPLICATIONS — The standard
CV unit is capable of being operated with either a Carrier-
approved thermostat or a field-supplied sensor. (See Price
Pages for ordering information.)
Features with Thermostat Control of Unit
• two-stage heating (if installed)
• two-stage cooling
• control of unit using Y1, Y2, W1, W2, and G thermostat
inputs
• control of the indoor fan
• outdoor air temperature/supply air temperature monitoring
• control of an outdoor air condenser fan based on outdoor
air temperature
Table 3 — Controls Options and Configurations (Non-Thermostat Applications)
UNIT CONFIGURATION
DEFAULT COOLING
DEFAULT HEATING
UNITS RUNNING VERSION 1.0 UNIT CONTROL SOFTWARE
Unoccupied Cooling — 90 F (SPT)
Occupied Cooling — NA
Unoccupied Heating — 55 F (SPT)
Occupied Heating — NA
CV or VAV Unit with SPT Sensor
CV Unit with SPT Sensor and Remote
Start/Stop Switch
Unoccupied Cooling — 90 F (SPT)
Occupied Cooling — 78 F (SPT)
Unoccupied Heating — 55 F (SPT)
Occupied Heating — 68 F (SPT)
Unoccupied Cooling — NA
Occupied Cooling — 55 F (SAT)
Unoccupied Heating — NA
Occupied Heating — NA
VAV Unit Remote Start/Switch Only
VAV Unit with SPT Sensor and Remote
Start/Stop Switch
Unoccupied Cooling — 90 F (SPT)
Occupied Cooling — 55 F (SAT)
Unoccupied Heating — 55 F (SPT)
Occupied Heating — NA
UNITS RUNNING VERSION 2.0 UNIT CONTROL SOFTWARE
Unoccupied Cooling — 90 F (SPT)
Occupied Cooling — NA
Unoccupied Heating — 55 F (SPT)
Occupied Heating — NA
CV or VAV Unit with SPT Sensor
CV Unit with SPT Sensor and Remote
Start/Stop Switch
Unoccupied Cooling — 90 F (SPT)
Occupied Cooling — 78 F (SPT)
Unoccupied Heating — 55 F (SPT)
Occupied Heating — 68 F (SPT)
Unoccupied Cooling — 90 F (RAT)
Occupied Cooling — 55 F (SAT)
Unoccupied Heating — 55 F (RAT)
Occupied Heating — 68 F (RAT)*
VAV Unit Remote Start/Stop Switch Only
VAV Unit with SPT Sensor and Remote
Start/Stop Switch
Unoccupied Cooling — 90 F (SPT)
Occupied Cooling — 55 F (SAT)
Unoccupied Heating — 55 F (SPT)
Occupied Heating — 68 F (RAT)*
LEGEND
*With DIP Switch No. 5 configured to OPEN (Occupied Heat Enabled).
NOTE: Space temperature sensor and remote stop/switch are field-supplied.
CV
—
—
—
Constant Volume
Not Available
SAT
SPT
VAV
—
—
—
Supply-Air Temperature
Space Temperature
Variable Air Volume
NA
RAT
Return-Air Temperature
12
Features with sensor control of unit with computer access
are:
or during unexpected power outages. For complete Carrier
Comfort System (CCS) or Carrier Comfort Network (CCN)
features and benefits, refer to the product literature.
• 365 day timeclock with backup (supports minute, hour,
day of week, date, month, and year)
VARIABLE AIR VOLUME (VAV) APPLICATIONS
• daylight savings time function
Features with Stand-Alone Applications — A VAV unit is
capable of providing unoccupied cooling controlling to a
90 F return-air temperature utilizing the factory-supplied return-
air thermistor located below the return-air damper in the return-
air section for unit control. The unit will provide unoccupied
heating (if electric heat is installed) controlling to a 55 F
return-air temperature. Also provided is a morning warm-up
which is initiated by the Occupied mode (if electric heat is
installed) and continues until the return-air temperature rises
to 68 F. The unit will provide occupied cooling with a de-
fault temperature of 55 F for the supply air. The supply-air
temperature is measured by the supply-air thermistor, lo-
cated in the indoor fan compartment.
• occupancy control with 8 periods for unit operation
• holiday table containing up to 18 holiday schedules
• ability to initiate timed override from T-55 or T-56 sensors
• ability to use multiple space temperature sensors to aver-
age the space temperature
• supply air temperature reset for the supply air temperature
set point
• temperature compensated start to calculate early start times
before occupancy
• access to the Display, Maintenance, Configuration, Serv-
ice, and Set Point data table through network software
When the unit is equipped with a field-supplied space tem-
perature sensor and a remote contact closure (remote start/
stop) on the base control board, the occupied default set points
will monitor unit operation. The occupied default set points
are 78 F cooling and 68 F heating (if electric heat is in-
stalled). See Fig. 11 for remote start/stop wiring.
NOTE: For units which have not had the base unit control
board accessed via software to set an occupancy schedule,
the remote start/stop closure will allow the unit to operate in
the pre-configured occupied default set points (based on return-
air temperature) of 78 F cooling and 68 F heating. Without
this feature, the unit will control to the unoccupied default
set points of 90 F cooling and 55 F heating (if electric heat
is installed).
An electronic expansion board may be field-installed to
provide the following features:
• control of modulating economizer damper to maintain
indoor air quality (IAQ) when outdoor conditions are
suitable
• provide discrete inputs for fan status, filter status, field-
applied status, and demand limit
• provide an output for the external alarm light indicator
When the unit is connected to the CCN (Carrier Comfort
Network), the following expansion board features can be
utilized.
• perform Demand Limit functions based on CCN loadshed
commands or the state of the discrete input
• alarm monitoring of all key parameters
• CCN protocol
Standard features of a VAV unit with a remote start/stop
switch are:
• control of an outdoor condenser fan based upon outdoor
air temperature
• control of modulating economizer to provide free cooling
when outdoor conditions are suitable, using supply air tem-
perature as a set point
• support of remote occupied/unoccupied input to start or
stop the unit
• provide power exhaust output to an external power ex-
haust controller
• support supply air temperature reset to offset supply air
set point
• support a field test for field check out
• support linkage to DAV systems
• cooling capacity control of 6 stages plus economizer with
compressors and unloaders to maintain supply air tem-
perature set point during occupied periods
• control of one stage of heat to maintain supply air tem-
perature at supply air set point during occupied periods
• provide a variable frequency drive high voltage relay out-
put to enable VFD
• control of heat interlock relay
With the addition of a remote start/stop switch heating or
cooling is enabled during unoccupied periods as required to
maintain space temperature to within unoccupied set points.
• provides power exhaust fire outputs for direct control of
modulated power exhaust stages during fire or smoke modes
• smoke control modes including evacuation, smoke purge,
pressurization, and fire shutdown (modulating power ex-
haust required)
• provides CCN IAQ participation
See Carrier TEMP or VVT (Variable Volume and Tem-
perature) literature for complete TEMP (single zone) or VVT
(multi-zone) application information.
Features with Sensor Control of Unit (Network Applica-
tions) — The base control board provides, as standard, a con-
nection for use with a Carrier VVT system and can also be
integrated into a Carrier Comfort Network.
When the unit is accessed via a PC equipped with Com-
fort Works, Building Supervisor, or Service Tool, the fol-
lowing features can be accessed:
• on-board timeclock can be programmed
• occupancy schedules can be programmed
• unit set points can be changed
• alarms can be monitored
This access is available on the base control board via a
RJ-11 phone jack or a 3-wire connection to the communi-
cation bus. See Fig. 12. The timeclock has a 10-hour minimum
back-up time to provide for unit power off for servicing unit
NOTE: On units running Version 1.0 of the Unit Control Software, the remote
start/stop switch is connected to R and Y1. On units running Version 2.0 of the
Unit Control Software, the remote start/stop switch is connected to R and W1.
Fig. 11 — Field Control Remote Start/Stop
13
14
For units running Version 1.0 of the unit control software,
network access software is required to enable occupied heat-
ing. For units running Version 2.0 of the unit control soft-
ware, occupied heating is enabled or disabled by the posi-
tion of DIP switch no. 5.
Additional features may be provided with electronic ac-
cess to Unit Control Board. These features are:
• control board diagnostics
• compressor time guard override (power up, minimum off
and on times)
• compressor lockout during low supply-air temperature
• electronic expansion board features (if installed)
• field test capability
• control of the economizer damper and indoor fan to op-
tion unoccupied free cooling
• 365 day timeclock with backup (supports minute, hour, day,
month, and year)
an occupancy schedule, the unit will control to the unoccu-
pied default set points of 90 F (return air) cooling and 55 F
(return air) heating (if electric heat is installed).
Features with NetworkApplications — The base control board
provides, as standard, a connection for use with a Carrier
Comfort System and can also be integrated into a Carrier
Comfort Network. When the unit is accessed via a PC equipped
with Comfort Works, Building Supervisor, or Service Tool
software, the following features can be accessed:
• on-board timeclock can be programmed
• occupancy schedules can be programmed
• unit set points can be changed
• alarms can be monitored
This access is available on the base control board via a
RJ-11 phone jack or a 3-wire connection to the communi-
cation bus. See Fig. 12. The timeclock has a 10-hour mini-
mum back-up time to provide for unit power off for servic-
ing unit or during unexpected power outages. For complete
Carrier Comfort System (CCS) or Carrier Comfort Network
(CCN) features and benefits, refer to the product literature.
• holiday table containing up to 18 holiday schedules
• occupancy control with 8 periods for unit operation
• support a set of display, maintenance, configuration, serv-
ice, and set point data tables for interface with Building
Supervisor, Comfort Works, or Service Tool
Step 7 — Make Electrical Connections
When a VAV unit with a space temperature sensor is ac-
cessed via a computer, the following additional features are
available:
• ability to initiate timed override from T-55 sensors
• ability to use multiple space temperature sensors to aver-
age space temperature
• temperature compensated start to calculate early start time
before occupancy
POWER WIRING — Units are factory wired for the voltage
shown on the unit nameplate. The main terminal block is
suitable for use with aluminum or copper wires and is sized
for single-point electric heat.
When installing units, provide a disconnect per NEC (Na-
tional Electrical Code) of adequate size (MOCP [maximum
overcurrent protection] of unit is on the informative plate).
All field wiring must comply with NEC and all local codes.
Size wire based on MCA (minimum circuit amps) on the
unit informative plate. See Fig. 13 for power wiring con-
nections to the unit power terminal block and equipment ground.
The main power terminal block is suitable for use with
aluminum or copper wire. See Fig. 13. Units have circuit
breakers for compressors, fan motors, and control circuit. If
required by local codes, provide an additional disconnect,
per NEC and local codes requirements, of adequate size
(Table 4). Whenever external electrical sources are used, unit
must be electrically grounded in accordance with local codes,
or in absence of local codes, with NEC, ANSI (American
National Standards Institute) C1-latest year.
• provide space temperature reset to reset the supply air set
point upward when the temperature falls below the occu-
pied cooling set point
An electronic expansion board may be field-installed to
provide the following features:
• fan status
• filter status
• field-applied status
• demand limiting
• IAQ sensor
• OAQ sensor
• alarm light
When the unit is connected to the CCN (Carrier Comfort
Network), the following expansion board features can be
utilized:
All field wiring must comply with NEC and local code
requirements.
FIELD POWER SUPPLY — Unit is factory wired for volt-
age shown on nameplate. See Table 4 for electrical data.
Field wiring can be brought into the unit from bottom
(through basepan and roof curb) or through side of unit (cor-
ner post next to control box).
• CCN IAQ (indoor air quality) participation
• CCN OAQ (outdoor air quality) participation
• CCN demand limit participation
• fire unit shutdown
• fire pressurization
• fire evacuation
• fire smoke purge
• modulated power exhaust override
A field-supplied space temperature sensor can be added to
provide the following:
• T-57 sensor will monitor room temperature
• T-55 sensor will monitor room temperature and provide
unoccupied override capability (1 hour)
When the unit is equipped with a field-supplied space tem-
perature sensor and a remote contact closure (remote start/
stop), the occupied default set points will monitor unit op-
eration. The occupied default set points are 55 F (supply air)
cooling and 68 F (space temperature) heating (if electric heat
is installed). See Fig. 11 for remote start/stop wiring.
LEGEND
NOTE: For units without a space temperature sensor and which
have not had the base unit control board accessed via soft-
ware to set an occupancy schedule, the remote start/stop clo-
sure will allow the unit to operate in the pre-configured oc-
cupied default set points of 55 F (supply-air temperature)
cooling and 68 F (return-air temperature) heating. Without
EQUIP
GND
NEC
TB
—
—
—
—
Equipment
Ground
National Electrical Code
Terminal Block
NOTE: Maximum wire size for TB1 is 500 MCM.
Fig. 13 — Field Power Wiring Connections
15
A 31⁄2-in. NPT coupling for field power wiring and a
4-in. NPT coupling for 24-v control wiring are provided in
3
⁄
basepan. In the side post, there are two 21⁄2-in. (024-034) or
3-in. (038-048) knockouts for the field power wiring. See
Fig. 3-6. If control wiring is to be brought in through the
7
side of unit, a ⁄8-in. diameter hole is provided in the con-
Table 4 — Electrical Data — 50EJ,EK,EW,EY024-048
COMPRESSOR
No. 1 No. 2
VOLTAGE
RANGE
POWER
ELECTRIC
HEAT*
NOMINAL
VOLTAGE
(3 Ph 60 Hz)
OFM
IFM
FLA
POWER SUPPLY
UNIT
SIZE
EXHAUST
Min
Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp
FLA LRA
kW
FLA
MCA
MOCP†
—
23.6
—
41.6
—
—
—
—
101.8/100.3 125/125
125.4/123.9 150/150
16.7/
15.2
—
23.6
—
41.6
29/36
29/36
75.1/ 86.6
114.7/127.3
125/150
5
75.1/ 86.6 144.2/156.8 150/175
—
23.6
—
41.6
59/72 150.1/173.2 171.0/192.2 200/225
59/72 150.1/173.2 200.5/221.7 225/225
—
23.6
—
41.6
—
—
—
—
115.9/113.1
150/150
139.5/136.7 175/175
30.8/
28.0
—
—
29/36
29/36
75.1/ 86.6 132.3/143.3 150/150
75.1/ 86.6 161.8/172.8 175/175
208/230
187
254
508
632
39.1
19.9
16.0
228
114
91
25.6
11.5
9.6
160
2
2
2
1
1
1
5.3
2.7
2.4
10
15
5
23.6
41.6
—
23.6
—
41.6
59/72 150.1/173.2 188.6/208.2 220/225
59/72 150.1/173.2 218.1/237.7 250/250
—
23.6
—
41.6
—
—
—
—
131.3/127.1 150/150
154.9/150.7 175/175
46.2/
42.0
—
23.6
—
41.6
29/36
29/36
75.1/ 86.6 151.6/160.8 175/175
75.1/ 86.6 181.1/190.3 200/200
—
23.6
—
41.6
59/72 150.1/173.2 207.9/225.7 250/250
59/72 150.1/173.2 237.4/255.2 275/275
—
12.6
—
23.6
—
—
—
—
49.4
62.0
60
80
—
12.6
—
23.6
36
36
43.3
43.3
63.6
79.4
70
80
7.6
14
21
6.1
11
—
12.6
—
23.6
72
72
86.6
86.6
96.1
111.9
110
125
—
12.6
—
23.6
—
—
—
—
55.8
68.4
70
80
—
12.6
—
23.6
36
36
43.3
43.3
71.6
87.4
80
90
024
460
414
80
10
15
5
—
12.6
—
23.6
72
72
86.6
86.6
104.1
119.9
110
125
—
12.6
—
23.6
—
—
—
—
62.8
75.4
80
90
—
12.6
—
23.6
36
36
43.3
43.3
80.4
96.1
90
100
—
12.6
—
23.6
72
72
86.6
86.6
112.9
128.6
125
150
—
12.6
—
23.6
—
—
—
—
40.5
53.1
50
60
—
12.6
—
23.6
36
36
34.6
34.6
50.9
66.7
60
70
—
12.6
—
23.6
72
72
69.3
69.3
76.9
92.7
80
100
—
12.6
—
23.6
—
—
—
—
45.4
58.0
60
70
—
12.6
—
23.6
36
36
34.6
34.6
57.1
72.8
60
80
575
518
64
10
15
—
12.6
—
23.6
72
72
69.3
69.3
83.0
98.8
90
100
—
12.6
—
23.6
—
—
—
—
51.4
64.0
60
80
—
12.6
—
23.6
36
36
34.6
34.6
64.6
80.3
70
90
17
—
12.6
—
23.6
72
72
69.3
69.3
90.5
106.3
100
110
Determine maximum deviation from average voltage.
LEGEND
Full Load Amps
(AB) 457 − 452 = 5 v
(BC) 464 − 457 = 7 v
(AC) 457 − 455 = 2 v
FLA
—
—
—
—
—
—
—
—
—
HACR
IFM
Heating, Air Conditioning and Refrigeration
Indoor (Evaporator) Fan Motor
Locked Rotor Amps
LRA
Maximum deviation is 7 v.
MCA
MOCP
NEC
OFM
RLA
Minimum Circuit Amps
Maximum Overcurrent Protection
National Electrical Code
Determine percent of voltage imbalance.
7
% Voltage Imbalance = 100 x
Outdoor (Condenser) Fan Motor
Rated Load Amps
457
= 1.53%
*Heater capacity (kW) is based on heater voltage of 208 v, 240 v, 480 v, and 575 v.
If power distribution voltage to unit varies from rated heater voltage, heater kW will
vary accordingly.
This amount of phase imbalance is satisfactory as it is below the maximum
allowable 2%.
†Fuse or HACR circuit breaker.
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load equip-
ment (refer to NEC Articles 430 and 440), the overcurrent protective device for the
unit shall be fuse or HACR breaker. The Canadian units may be fuse or circuit
breaker.
3. MCA calculation for units with electric heaters over 50 kW = (1.25 x IFM amps) +
(1.00 x heater FLA).
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is greater than
2%. Use the following formula to determine the percent of voltage imbalance.
max voltage deviation from average voltage
% Voltage Imbalance = 100 x
average voltage
EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
452 + 464 + 455
Average Voltage =
3
1371
=
3
=
457
17
Table 4 — Electrical Data — 50EJ,EK,EW,EY024-048 (cont)
COMPRESSOR
No. 1 No. 2
VOLTAGE
RANGE
POWER
ELECTRIC
HEAT*
NOMINAL
VOLTAGE
(3 Ph 60 Hz)
OFM
IFM
FLA
POWER SUPPLY
UNIT
SIZE
EXHAUST
Min
Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp
FLA LRA
kW
FLA
MCA
MOCP†
—
23.6
—
41.6
—
—
—
—
122.8/120.6 150/150
146.4/144.2 175/175
24.2/
22.0
—
23.6
—
41.6
29/36
29/36
75.1/ 86.6 124.1/135.8 150/150
75.1/ 86.6 153.6/165.3 175/175
7.5
—
23.6
—
41.6
59/72 150.1/173.2 180.4/200.7 200/225
59/72 150.1/173.2 209.9/230.2 225/250
—
23.6
—
41.6
—
—
—
—
129.4/126.6 150/150
153.0/150.2 175/175
30.8/
28.0
—
—
29/36
29/36
75.1/ 86.6 132.3/143.3 150/150
75.1/ 86.6 161.8/172.8 175/175
208/230
187
254
508
632
39.1
19.9
16.0
228
114
91
39.1
19.9
16.0
228
114
91
2
2
2
1
1
1
5.3
2.7
2.4
10
15
7.5
10
15
7.5
10
15
23.6
41.6
—
23.6
—
41.6
59/72 150.1/173.2 188.6/208.2 200/225
59/72 150.1/173.2 218.1/237.7 225/250
—
23.6
—
41.6
—
—
—
—
144.8/140.6 175/175
168.4/164.2 200/200
46.2/
42.0
—
23.6
—
41.6
29/36
29/36
75.1/ 86.6 151.6/160.8 175/175
75.1/ 86.6 181.1/190.3 200/200
—
23.6
—
41.6
59/72 150.1/173.2 207.9/225.7 250/250
59/72 150.1/173.2 237.4/255.2 275/275
—
12.6
—
23.6
—
—
—
—
61.2
73.8
80
90
—
12.6
—
23.6
36
36
43.3
43.3
67.9
83.6
70
90
11
14
21
9
—
12.6
—
23.6
72
72
86.6
86.6
100.4
116.1
110
125
—
12.6
—
23.6
—
—
—
—
64.2
76.8
80
90
—
12.6
—
23.6
36
36
43.3
43.3
71.6
87.4
80
90
028
460
414
—
12.6
—
23.6
72
72
86.6
86.6
104.1
119.9
110
125
—
12.6
—
23.6
—
—
—
—
71.2
83.8
90
100
—
12.6
—
23.6
36
36
43.3
43.3
80.4
96.1
90
100
—
12.6
—
23.6
72
72
86.6
86.6
112.9
128.6
125
150
—
12.6
—
23.6
—
—
—
—
49.8
62.4
60
70
—
12.6
—
23.6
36
36
34.6
34.6
54.6
70.3
60
80
—
12.6
—
23.6
72
72
69.3
69.3
80.5
96.3
90
100
—
12.6
—
23.6
—
—
—
—
51.8
64.4
60
80
—
12.6
—
23.6
36
36
34.6
34.6
57.1
72.8
60
80
575
518
11
17
—
12.6
—
23.6
72
72
69.3
69.3
83.0
98.8
90
100
—
12.6
—
23.6
—
—
—
—
57.8
70.4
70
80
—
12.6
—
23.6
36
36
34.6
34.6
64.6
80.3
70
90
—
12.6
—
23.6
72
72
69.3
69.3
90.5
106.3
100
110
18
Table 4 — Electrical Data — 50EJ,EK,EW,EY024-048 (cont)
COMPRESSOR
No. 1 No. 2
VOLTAGE
RANGE
POWER
ELECTRIC
HEAT*
NOMINAL
VOLTAGE
(3 Ph 60 Hz)
OFM
IFM
FLA
POWER SUPPLY
UNIT
SIZE
EXHAUST
Min
Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp
FLA LRA
kW
FLA
MCA
MOCP†
—
23.6
—
41.6
—
—
—
—
151.9/149.1 200/200
175.5/172.7 225/225
30.8/
28.0
—
23.6
—
41.6
29/36
29/36
75.1/ 86.6 151.9/149.1 200/200
75.1/ 86.6 175.5/172.8 225/225
10
—
23.6
—
41.6
59/72 150.1/173.2 188.6/208.2 200/225
59/72 150.1/173.2 218.1/237.7 225/250
—
23.6
—
41.6
—
—
—
—
167.3/163.1 200/200
190.9/186.7 225/225
46.2/
42.0
—
—
29/36
29/36
75.1/ 86.6 167.3/163.1 200/200
75.1/ 86.6 190.9/186.7 225/225
208/230
187
254
508
632
57.1
25.6
20.5
266
120
96
39.1
19.9
16.0
228
114
91
2
2
2
1
1
1
5.3
2.7
2.4
15
20
10
15
20
10
15
20
23.6
41.6
—
23.6
—
41.6
59/72 150.1/173.2 207.9/225.7 250/250
59/72 150.1/173.2 237.4/255.2 275/275
—
23.6
—
41.6
—
—
—
—
180.5/175.1 225/225
204.1/198.7 250/250
59.4/
54.0
—
23.6
—
41.6
29/36
29/36
75.1/ 86.6 180.5/175.1 225/225
75.1/ 86.6 204.1/198.7 250/250
—
23.6
—
41.6
59/72 150.1/173.2 224.4/240.7 275/275
59/72 150.2/173.2 253.9/270.2 300/300
—
12.6
—
23.6
—
—
—
—
71.3
83.9
90
100
—
12.6
—
23.6
36
36
43.3
43.3
71.6
87.4
90
100
14
21
27
11
17
22
—
12.6
—
23.6
72
72
86.6
86.6
104.1
119.9
110
125
—
12.6
—
23.6
—
—
—
—
78.3
90.9
100
110
—
12.6
—
23.6
36
36
43.3
43.3
80.4
96.1
100
110
030
460
414
—
12.6
—
23.6
72
72
86.6
86.6
112.9
128.6
125
150
−
12.6
—
23.6
—
—
—
—
84.3
96.9
100
110
—
12.6
—
23.6
36
36
43.3
43.3
87.9
103.6
100
110
—
12.6
—
23.6
72
72
86.6
86.6
120.4
136.1
125
150
—
12.6
—
23.6
—
—
—
—
57.4
70.0
70
90
—
12.6
—
23.6
36
36
34.6
34.6
57.4
72.8
70
90
—
12.6
—
23.6
72
72
69.3
69.3
83.0
98.8
90
100
—
12.6
—
23.6
—
—
—
—
63.4
76.0
80
90
—
12.6
—
23.6
36
36
34.6
34.6
64.6
80.3
80
90
575
518
—
12.6
—
23.6
72
72
69.3
69.3
90.5
106.3
100
110
—
12.6
—
23.6
—
—
—
—
68.4
81.0
80
100
—
12.6
—
23.6
36
36
34.6
34.6
70.8
86.6
80
100
—
12.6
—
23.6
72
72
69.3
69.3
96.8
112.5
110
125
Determine maximum deviation from average voltage.
LEGEND
Full Load Amps
(AB) 457 − 452 = 5 v
(BC) 464 − 457 = 7 v
(AC) 457 − 455 = 2 v
FLA
—
—
—
—
—
—
—
—
—
HACR
IFM
Heating, Air Conditioning and Refrigeration
Indoor (Evaporator) Fan Motor
Locked Rotor Amps
LRA
Maximum deviation is 7 v.
MCA
MOCP
NEC
OFM
RLA
Minimum Circuit Amps
Maximum Overcurrent Protection
National Electrical Code
Determine percent of voltage imbalance.
7
% Voltage Imbalance = 100 x
Outdoor (Condenser) Fan Motor
Rated Load Amps
457
= 1.53%
*Heater capacity (kW) is based on heater voltage of 208 v, 240 v, 480 v, and 575 v.
If power distribution voltage to unit varies from rated heater voltage, heater kW will
vary accordingly.
This amount of phase imbalance is satisfactory as it is below the maximum
allowable 2%.
†Fuse or HACR circuit breaker.
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load equip-
ment (refer to NEC Articles 430 and 440), the overcurrent protective device for the
unit shall be fuse or HACR breaker. The Canadian units may be fuse or circuit
breaker.
3. MCA calculation for units with electric heaters over 50 kW = (1.25 x IFM amps) +
(1.00 x heater FLA).
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is greater than
2%. Use the following formula to determine the percent of voltage imbalance.
max voltage deviation from average voltage
% Voltage Imbalance = 100 x
average voltage
EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
452 + 464 + 455
Average Voltage =
3
1371
=
3
=
457
19
Table 4 — Electrical Data — 50EJ,EK,EW,EY024-048 (cont)
COMPRESSOR
No. 1 No. 2
VOLTAGE
RANGE
POWER
ELECTRIC
HEAT*
NOMINAL
VOLTAGE
(3 Ph 60 Hz)
OFM
IFM
FLA
POWER SUPPLY
UNIT
SIZE
EXHAUST
Min
Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp
FLA LRA
kW
FLA
MCA
MOCP†
—
23.6
—
41.6
—
—
—
—
169.9/167.1 225/200
193.5/190.7 250/225
30.8/
28.0
—
23.6
—
41.6
29/36
29/36
75.1/ 86.6 169.9/167.1 225/200
75.1/ 86.6 193.5/190.7 250/225
10
—
23.6
—
41.6
59/72 150.1/173.2 188.6/208.2 225/225
59/72 150.1/173.2 218.1/237.7 250/250
—
23.6
—
41.6
—
—
—
—
185.3/181.1 225/225
208.9/204.7 250/250
46.2/
42.0
—
—
29/36
29/36
75.1/ 86.6 185.3/181.1 225/225
75.1/ 86.6 208.9/204.7 250/250
208/230
187
254
57.1
266
57.1
266
2
1
5.3
15
20
10
15
20
23.6
41.6
—
23.6
—
41.6
59/72 150.1/173.2 207.9/225.7 250/250
59/72 150.1/173.2 237.4/255.2 275/275
—
23.6
—
41.6
—
—
—
—
198.5/193.1 250/250
222.1/216.7 275/250
59.4/
54.0
—
23.6
—
41.6
29/36
29/36
75.1/ 86.6 198.5/193.1 250/250
75.1/ 86.6 222.1/216.7 275/250
—
23.6
—
41.6
59/72 150.1/173.2 224.4/240.7 275/275
59/72 150.1/173.2 253.9/270.2 300/300
—
12.6
—
23.6
—
—
—
—
77.0
89.6
100
110
—
12.6
—
23.6
36
36
43.3
43.3
77.0
89.6
100
110
14
21
27
—
12.6
—
23.6
72
72
86.6
86.6
104.1
119.9
110
125
—
12.6
—
23.6
—
—
—
—
84.0
96.6
100
110
—
12.6
—
23.6
36
36
43.3
43.3
84.0
96.6
100
110
034
460
414
508
25.6
120
25.6
120
2
1
2.7
—
12.6
—
23.6
72
72
86.6
86.6
112.9
128.6
125
150
—
—
—
—
90.0
110
Table 4 — Electrical Data — 50EJ,EK,EW,EY024-048 (cont)
COMPRESSOR
No. 1 No. 2
VOLTAGE
RANGE
POWER
ELECTRIC
HEAT*
NOMINAL
VOLTAGE
(3 Ph 60 Hz)
OFM
IFM
FLA
POWER SUPPLY
UNIT
SIZE
EXHAUST
Min
Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp
FLA LRA
kW
FLA
MCA
MOCP†
—
23.6
—
41.6
—
—
—
—
180.5/177.7 225/225
204.1/201.3 250/250
30.8/
28.0
—
23.6
—
41.6
29/36
29/36
75.1/ 86.6 180.5/177.7 225/225
75.1/ 86.6 204.1/201.3 250/250
10
—
23.6
—
41.6
59/72 150.1/173.2 188.6/208.2 225/225
59/72 150.1/173.2 218.1/237.7 250/250
—
23.6
—
41.6
—
—
—
—
195.9/191.7 250/225
219.5/215.3 275/250
46.2/
42.0
—
—
29/36
29/36
75.1/ 86.6 195.9/191.7 250/225
75.1/ 86.6 219.5/215.3 275/250
208/230
187
254
508
632
57.1
25.6
20.5
266
120
96
57.1
25.6
20.5
266
120
96
4
4
4
1
1
1
5.3
2.7
2.4
15
20
10
15
20
10
15
20
23.6
41.6
—
23.6
—
41.6
59/72 150.1/173.2 207.9/225.7 250/250
59/72 150.1/173.2 237.4/255.2 275/275
—
23.6
—
41.6
—
—
—
—
209.1/203.7 250/250
232.7/227.3 275/275
59.4/
54.0
—
23.6
—
41.6
29/36
29/36
75.1/ 86.6 209.1/203.7 250/250
75.1/ 86.6 232.7/227.3 275/275
—
23.6
—
41.6
59/72 150.1/173.2 224.4/240.7 275/275
59/72 150.1/173.2 253.9/270.2 300/300
—
12.6
—
23.6
—
—
—
—
82.4
95.0
100
110
—
12.6
—
23.6
36
36
43.3
43.3
82.4
95.0
100
110
14
21
27
11
17
22
—
12.6
—
23.6
72
72
86.6
86.6
104.1
119.9
110
125
—
12.6
—
23.6
—
—
—
—
89.4
102.0
110
125
—
12.6
—
23.6
36
36
43.3
43.3
89.4
102.0
110
125
038
460
414
—
12.6
—
23.6
72
72
86.6
86.6
112.9
128.6
125
150
—
12.6
—
23.6
—
—
—
—
95.4
108.0
110
125
—
12.6
—
23.6
36
36
43.3
43.3
95.4
108.0
110
125
—
12.6
—
23.6
72
72
86.6
86.6
120.4
136.1
125
150
—
12.6
—
23.6
—
—
—
—
66.7
79.3
80
90
—
12.6
—
23.6
36
36
34.6
34.6
66.7
79.3
80
90
—
12.6
—
23.6
72
72
69.3
69.3
83.0
98.8
90
100
—
12.6
—
23.6
—
—
—
—
72.7
85.3
90
100
—
12.6
—
23.6
36
36
34.6
34.6
72.7
85.3
80
100
575
518
—
12.6
—
23.6
72
72
69.3
69.3
90.5
106.3
100
110
—
12.6
—
23.6
—
—
—
—
77.7
90.3
90
110
—
12.6
—
23.6
36
36
34.6
34.6
77.7
90.3
90
110
—
12.6
—
23.6
72
72
69.3
69.3
96.8
112.5
110
125
Determine maximum deviation from average voltage.
LEGEND
Full Load Amps
(AB) 457 − 452 = 5 v
(BC) 464 − 457 = 7 v
(AC) 457 − 455 = 2 v
FLA
—
—
—
—
—
—
—
—
—
HACR
IFM
Heating, Air Conditioning and Refrigeration
Indoor (Evaporator) Fan Motor
Locked Rotor Amps
LRA
Maximum deviation is 7 v.
MCA
MOCP
NEC
OFM
RLA
Minimum Circuit Amps
Maximum Overcurrent Protection
National Electrical Code
Determine percent of voltage imbalance.
7
% Voltage Imbalance = 100 x
Outdoor (Condenser) Fan Motor
Rated Load Amps
457
= 1.53%
*Heater capacity (kW) is based on heater voltage of 208 v, 240 v, 480 v, and 575 v.
If power distribution voltage to unit varies from rated heater voltage, heater kW will
vary accordingly.
This amount of phase imbalance is satisfactory as it is below the maximum
allowable 2%.
†Fuse or HACR circuit breaker.
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load equip-
ment (refer to NEC Articles 430 and 440), the overcurrent protective device for the
unit shall be fuse or HACR breaker. The Canadian units may be fuse or circuit
breaker.
3. MCA calculation for units with electric heaters over 50 kW = (1.25 x IFM amps) +
(1.00 x heater FLA).
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is greater than
2%. Use the following formula to determine the percent of voltage imbalance.
max voltage deviation from average voltage
% Voltage Imbalance = 100 x
average voltage
EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
452 + 464 + 455
Average Voltage =
3
1371
=
3
=
457
21
Table 4 — Electrical Data — 50EJ,EK,EW,EY024-048 (cont)
COMPRESSOR
No. 1 No. 2
VOLTAGE
RANGE
POWER
ELECTRIC
HEAT*
NOMINAL
VOLTAGE
(3 Ph 60 Hz)
OFM
IFM
FLA
POWER SUPPLY
UNIT
SIZE
EXHAUST
Min
Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp
FLA LRA
kW
FLA
MCA
MOCP†
—
23.6
—
41.6
—
—
—
—
223.1/218.9 275/275
246.7/242.5 300/300
46.2/
42.0
—
23.6
—
41.6
29/36
29/36
75.1/ 86.6 223.1/218.9 275/275
75.1/ 86.6 246.7/242.5 300/300
15
—
23.6
—
41.6
59/72 150.1/173.2 223.1/225.7 275/275
59/72 150.1/173.2 246.7/255.2 300/300
—
23.6
—
41.6
—
—
—
—
236.3/230.9 300/300
259.9/254.5 300/300
59.4/
54.0
—
—
29/36
29/36
75.1/ 86.6 236.3/230.9 300/300
75.1/ 86.6 259.9/254.5 300/300
208/230
187
254
508
632
69.2
28.8
26.7
345
173
120
69.2
28.8
26.7
345
173
120
4
4
4
1
1
1
5.3
2.7
2.4
20
25
15
20
25
15
20
25
23.6
41.6
—
23.6
—
41.6
59/72 150.1/173.2 236.3/240.7 300/300
59/72 150.1/173.2 259.9/270.2 300/300
—
23.6
—
41.6
—
—
—
—
251.7/244.9 300/300
275.3/268.5 300/300
74.8/
68.0
—
23.6
—
41.6
29/36
29/36
75.1/ 86.6 251.7/244.9 300/300
75.1/ 86.6 275.3/268.5 300/300
—
23.6
—
41.6
59/72 150.1/173.2 251.7/258.2 300/300
59/72 150.2/173.2 275.3/287.7 300/300
—
12.6
—
23.6
—
—
—
—
96.6
109.2
125
125
—
12.6
—
23.6
36
36
43.3
43.3
96.6
109.2
125
125
21
27
34
17
22
27
—
12.6
—
23.6
72
72
86.6
86.6
112.9
128.6
125
150
—
12.6
—
23.6
—
—
—
—
102.6
115.2
125
125
—
12.6
—
23.6
36
36
43.3
43.3
102.6
115.2
125
125
044
460
414
—
12.6
—
23.6
72
72
86.6
86.6
120.4
136.1
150
150
−
12.6
—
23.6
—
—
—
—
109.6
122.2
125
150
—
12.6
—
23.6
36
36
43.3
43.3
109.6
122.2
125
150
—
12.6
—
23.6
72
72
86.6
86.6
129.1
144.9
150
175
—
12.6
—
23.6
—
—
—
—
86.7
99.3
110
125
—
12.6
—
23.6
36
36
34.6
34.6
86.7
99.3
110
125
—
12.6
—
23.6
72
72
69.3
69.3
91.4
106.3
110
125
—
12.6
—
23.6
—
—
—
—
91.7
104.3
110
125
—
12.6
—
23.6
36
36
34.6
34.6
91.7
104.3
110
125
575
518
—
12.6
—
23.6
72
72
69.3
69.3
96.8
112.5
125
125
—
12.6
—
23.6
—
—
—
—
96.7
109.3
110
125
—
12.6
—
23.6
36
36
34.6
34.6
96.7
109.3
110
125
—
12.6
—
23.6
72
72
69.3
69.3
103.0
118.8
125
125
22
Table 3 — Electrical Data — 50EJ,EK,EW,EY024-048 (cont)
COMPRESSOR
No. 1 No. 2
VOLTAGE
RANGE
POWER
ELECTRIC
HEAT*
NOMINAL
VOLTAGE
(3 Ph 60 Hz)
OFM
IFM
FLA
POWER SUPPLY
UNIT
SIZE
EXHAUST
Min
Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp
FLA LRA
kW
FLA
MCA
MOCP†
—
23.6
—
41.6
—
—
—
—
252.4/247.0 300/300
276.0/270.6 300/300
59.4/
54.0
—
23.6
—
41.6
29/36
29/36
75.1/ 86.6 252.4/247.0 300/300
75.1/ 86.6 276.0/270.6 300/300
20
—
23.6
—
41.6
59/72 150.1/173.2 252.4/247.0 300/300
59/72 150.1/173.2 276.0/270.6 300/300
—
23.6
—
41.6
—
—
—
—
267.8/261.0 300/300
291.4/284.6 300/300
74.8/
68.0
—
—
29/36
29/36
75.1/ 86.6 267.8/261.0 300/300
75.1/ 86.6 291.4/284.6 300/300
208/230
187
254
508
632
82.1
42.3
34.6
446
223
164
69.2
28.8
26.7
345
173
120
4
4
4
1
1
1
5.3
2.7
2.4
25
30
20
25
30
20
25
30
23.6
41.6
—
23.6
—
41.6
59/72 150.1/173.2 267.8/261.0 300/300
59/72 150.1/173.2 291.4/284.6 300/300
—
23.6
—
41.6
—
—
—
—
281.0/273.0 300/300
304.6/296.6 350/300
88.0/
80.0
—
23.6
—
41.6
29/36
29/36
75.1/ 86.6 281.0/273.0 300/300
75.1/ 86.6 304.6/296.6 350/300
—
23.6
—
41.6
59/72 150.1/173.2 281.0/273.0 300/300
59/72 150.2/173.2 304.6/296.6 350/300
—
12.6
—
23.6
—
—
—
—
119.5
132.1
150
150
—
12.6
—
23.6
36
36
43.3
43.3
119.5
132.1
150
150
27
34
40
22
27
32
—
12.6
—
23.6
72
72
86.6
86.6
120.4
136.1
150
150
—
12.6
—
23.6
—
—
—
—
126.5
139.1
150
175
—
12.6
—
23.6
36
36
43.3
43.3
126.5
139.1
150
175
048
460
414
—
12.6
—
23.6
72
72
86.6
86.6
129.1
144.9
150
175
−
12.6
—
23.6
—
—
—
—
132.5
145.1
150
175
—
12.6
—
23.6
36
36
43.3
43.3
132.5
145.1
150
175
—
12.6
—
23.6
72
72
86.6
86.6
136.6
152.4
175
175
—
12.6
—
23.6
—
—
—
—
101.6
114.2
125
125
—
12.6
—
23.6
36
36
34.6
34.6
101.6
114.2
125
125
—
12.6
—
23.6
72
72
69.3
69.3
101.6
114.2
125
125
—
12.6
—
23.6
—
—
—
—
106.6
119.2
125
150
—
12.6
—
23.6
36
36
34.6
34.6
106.6
119.2
125
150
575
518
—
12.6
—
23.6
72
72
69.3
69.3
106.6
119.2
125
150
—
12.6
—
23.6
—
—
—
—
111.6
124.2
125
150
—
12.6
—
23.6
36
36
34.6
34.6
111.6
124.2
125
150
—
12.6
—
23.6
72
72
69.3
69.3
111.6
124.2
125
150
Determine maximum deviation from average voltage.
LEGEND
Full Load Amps
(AB) 457 − 452 = 5 v
(BC) 464 − 457 = 7 v
(AC) 457 − 455 = 2 v
FLA
—
—
—
—
—
—
—
—
—
HACR
IFM
Heating, Air Conditioning and Refrigeration
Indoor (Evaporator) Fan Motor
Locked Rotor Amps
LRA
Maximum deviation is 7 v.
MCA
MOCP
NEC
OFM
RLA
Minimum Circuit Amps
Maximum Overcurrent Protection
National Electrical Code
Determine percent of voltage imbalance.
7
% Voltage Imbalance = 100 x
Outdoor (Condenser) Fan Motor
Rated Load Amps
457
= 1.53%
*Heater capacity (kW) is based on heater voltage of 208 v, 240 v, 480 v, and 575 v.
If power distribution voltage to unit varies from rated heater voltage, heater kW will
vary accordingly.
This amount of phase imbalance is satisfactory as it is below the maximum
allowable 2%.
†Fuse or HACR circuit breaker.
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load equip-
ment (refer to NEC Articles 430 and 440), the overcurrent protective device for the
unit shall be fuse or HACR breaker. The Canadian units may be fuse or circuit
breaker.
3. MCA calculation for units with electric heaters over 50 kW = (1.25 x IFM amps) +
(1.00 x heater FLA).
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is greater than
2%. Use the following formula to determine the percent of voltage imbalance.
max voltage deviation from average voltage
% Voltage Imbalance = 100 x
average voltage
EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
452 + 464 + 455
Average Voltage =
3
1371
=
3
=
457
23
DIP
PEC
—
−
Dual In-Line Package
Power Exhaust Controller
Fig. 14 — Control Box Diagram (Sizes 024-034)
DIP
PEC
—
—
Dual In-Line Package
Power Exhaust Controller
Fig. 15 — Control Box Diagram (Sizes 038-048)
24
NOTE: On units running Version 1.0 of
the unit control software, the remote start/
stop switch is connected to R and Y1.
Conductors and drain wire must be 20 AWG minimum
stranded, tinned copper. Individual conductors must be in-
sulated with PVC, PVC/nylon, vinyl, Teflon, or polyethyl-
ene. An aluminum/polyester 100% foil shield and an outer
jacket of PVC, PVC/nylon, chrome vinyl, or Teflon with a
minimum operating temperature range of −20 C to 60 C
(−4 F to 140 F) is required. Table 5 lists cables that meet the
requirements.
Table 5 — CCN Connection Approved
Shielded Cables
MANUFACTURER
Alpha
CABLE PART NO.
2413 or 5463
A22503
American
Belden
8772
Columbia
02525
IMPORTANT: When connecting the CCN communi-
cation bus to a system element, use a color coding sys-
tem for the entire network to simplify installation and
checkout. See Table 6.
Fig. 16 — Field Control Thermostat Wiring
Table 6 — Color Code Recommendations
SIGNAL
TYPE
CCN BUS CONDUCTOR
INSULATION COLOR
CCN PLUG
PIN NO.
Positive (+)
Ground
RED
1
2
3
WHITE
BLACK
Negative (−)
NOTE: Sensor part numbers are
as follows:
NOTE: If a cable with a different color scheme is selected,
a similar color code should be adopted for the entire network.
T55 — HH51BX001
T56 — HH51BX004
T57 — CEC01215303-01
At each system element, the shields of the communica-
tion bus cables must be tied together. If the communication
bus is entirely within one building, the resulting continuous
shield must be connected to a ground at one point only. If
the communication bus cable exits from one building and
enters another, the shields must be connected to grounds at
the lightning suppressor in each building where the cable
enters or exits the building (one point per building only).
Fig. 17 — Field Control Temperature
Sensor Wiring
To connect the unit to the network:
1. Turn off power to the control box.
2. Cut the CCN wire and strip the ends of the red (+), white
(ground), and black (−) conductors. (If a different
network color scheme is used, substitute appropriate colors.)
3. Remove the 3-pin male plug from the base module in the
main control box, and connect the wires as follows:
a. Insert and secure the red (+) wire to terminal 1 of the
3-pin plug.
Remote Field Control (Units Running Version 2.0 of Unit
Control Software) — A switch closure across terminals R
and W1 on TB-3 will initiate the Occupied mode. This can
be done manually as well as through a field-supplied
timeclock.
Service Tool, Building Supervisor, and Comfort Works —
Access to the control board can be achieved through the ter-
minal marked CCN via a 3-wire bus.
b. Insert and secure the white (ground) wire to ter-
minal 2 of the 3-pin plug.
c. Insert and secure the black (−) wire to terminal 3 of
the 3-pin plug.
4. Insert the plug into the existing 3-pin mating connector
on the base module in the main control box.
IMPORTANT: Default bus address is 0. Default ele-
ment number is 1. Refer to CCN literature for infor-
mation on network addressing or changing CCN com-
munication defaults.
Step 8 — Make Outdoor-Air Inlet Adjustments
ECONOMIZER
Carrier Comfort Network Interface — The 50E units can be
connected to the CCN. The communication bus wiring is sup-
plied and installed in the field. Wiring consists of shielded,
3-conductor cable with drain wire.
NOTE: If accessory power exhaust or barometric relief pack-
ages are being added to the unit, install power exhaust or
barometric relief before installing economizer hoods.
Economizer Hood Assembly — The economizer hood is
shipped in a package secured to the outside of the unit and
must be field-assembled. There are 2 hoods on every unit.
The 50EW/EY units are side supply and side return. The re-
turn duct limits access to economizer filters from below. Fil-
ter tracks (mounting angle without tabs) must be installed
correctly to allow access to economizer filters from each side.
Perform the following procedure to assemble the econo-
mizer hood.
The system elements are connected to the communication
bus in a daisy chain arrangement. The positive pin of each
system element communication connector must be wired to
the positive pins of the system element on either side of it,
the negative pins must be wired to the negative pins, and the
signal pins must be wired to signal ground pins. Wiring con-
nections for CCN should be made at the 3-pin plug (CCN
located at the base board. Consult CCN literature for further
information.
25
NOTE: Before assembly of the economizer hood, check along
the outer edges of the economizer assembly for any seal strip
protruding past the flanges. Trim the excess seal strip so that
it is flush with the economizer assembly flanges.
1. Apply black seal strip (provided in package) to outside
top-edge of hood sides. Wrap seal strip over edge to cover
top flange (4 hood sides). Make sure seal strip covers
screw holes. Allow strip to overhang 1⁄8-in. past the end
opposite the mounting flange. See Fig. 18.
2. Assemble hood sides, top, and cross member with gas-
keted screws provided. See Fig. 19.
3. Attach 10 green speed clips (provided) to hood top.
4. Apply black seal strip (provided) to mounting flanges of
hood sides being sure to cover mounting holes. See
Fig. 20.
NOTE: Each hood assembly has a slotted side that should
be adjacent to the other hood when mounted to the unit.
5. Apply black seal strip (provided) to hood top mounting
flange. Seal strip of hood top mounting flange must press
tightly against seal strip of hood side mounting flanges.
See Fig. 21.
NOTE: Left side economizer hood has mounting angle without tabs and filter
track assembled end on the opposite side.
6. Add gray foam strip (provided in package) to cross mem-
bers on bottom tray. See Fig. 22.
Fig. 19 — Economizer Hood Assembly
(Right-Side Economizer Hood Shown)
7. Place gray foam strip (provided) on inside of slotted hood
side between filter and cross member opposite the mount-
ing end. See Fig. 23.
8. Attach gray foam strip (provided) to block-off baffle on
outer face of flange. See Fig. 24.
9. Remove the screws on each end and along top of damper
assembly of unit. Remove top 2 screws on each side of
filter panel under damper assembly. Set hood assembly
in place and attach to unit using these screws.
10. Attach accessory enthalpy bracket on hood side furthest
from control box end. Locate bracket on inside upper
right-hand corner of economizer hood using hood mount-
ing holes. Mount outdoor-air thermistor to enthalpy bracket
(if purchased). Attach and wire enthalpy assembly. Place
quick connects on enthalpy wires.
MOUNTING
FLANGE
HOOD SIDE
11. Remove screws along bottom of damper assembly. Lo-
cate and mount blockoff baffle using these screws.
12. Assemble 2 filter tracks side-by-side with the as-
sembled ends together.
13. Attach mounting angle (without tabs) to the assembled
end of the filter track. See Fig. 25.
14. Attach 6 green speed clips (provided) to mounting angles.
Engagement section of clip faces inside of rack.
Fig. 20 — Adding Seal Strip to
Mounting Flange of Hood Sides
TOP
15. Attach remaining mounting angle (with tabs) to other
end of the filter track with no. 10 screws provided. See
Fig. 26.
16. Place filter track assembly in bottom of hood by placing
tabbed end into slotted side (with tab on bottom) and
attaching opposite end to hood with speed clips and gas-
keted screws provided. Tabs can be hand bent after they
have been inserted into the side.
FLANGE
BLACK
HOOD SIDE
SEAL
STRIP
NOTE: The filter track assembly end with screws should
face away from the other hood when mounted on the unit.
NOTE: Tabs from both filter tracks will be in the same
space. After one filter track has been inserted into board,
bend the tabs so they will not interfere with installation
of the second hood.
17. Attach black seal strip (provided) to filter cover. Seal
strip should be applied to the center of the large flange
making sure to cover holes. See Fig. 27.
18. Slide two 20 x 25-in. filters into cross members of hood
assembly. Attach filter cover over filters with screws and
speed clips provided.
Fig. 18 — Adding Seal Strip to
Top of Hood Sides
26
HOOD TOP
HOOD SIDE
BLOCKOFF BAFFLE
GRAY FOAM STRIP
Fig. 21 — Adding Seal Strip to
Hood Top Mounting Flange
GRAY FOAM STRIP
Fig. 24 — Adding Foam Strip to Blockoff Baffle
CROSS MEMBER
MOUNTING ANGLE
(WITHOUT TABS)
FILTER TRACK
ASSEMBLY
Fig. 25 — Mounting Angle (Without Tabs)
Attached to Filter Track Assembly
Fig. 22 — Adding Foam Strip to Cross Member
HOOD SIDE
(SLOTTED)
HOOD
TOP
MOUNTING ANGLE
(WITH TABS)
Fig. 26 — Mounting Angle (With Tabs)
Attached to Filter Track Assembly
Fig. 23 — Adding Foam Strip to Hood Side
27
position to go to 10% for 30 seconds, then 20% for 30 sec-
onds, and when it reaches 30% close DIP switch no. 6 dur-
ing the 30-second period following the 30% position.
The minimum outdoor air damper position is now set.
ECONOMIZER SETTINGS
Minimum Damper Position Setting — Setting of the out-
door air damper position is performed in conjunction with a
shortened version of the field-run test. This is performed by
first opening DIP (Dual In-Line Package) switch no. 6 then
no. 4. See Fig. 17 and Table 7.
The outdoor-air damper closes. The control allows 90 sec-
onds for the damper to close in case it is in the full open
position. Next, the indoor-fan contactor will energize. The
outdoor-air damper will remain at 0% for 30 seconds. It will
then move to the 10% position for another 30 seconds. This
will be repeated at every 10% increment for 30 seconds until
the damper reaches 100% open. Close DIP switch no. 6 dur-
ing the 30 seconds immediately after the desired outdoor air
minimum damper position. The 30-second time period is to
allow time where DIP switch no. 6 can be closed. The de-
fault value of the minimum outdoor air damper position is
20%. If the desired minimum position is 30%, allow the damper
Accessory Enthalpy Control (Fig. 28) — The control
(HH57AC077) is mounted in the economizer hood. See
Fig. 19. The enthalpy setting adjustment is on the enthalpy
control. For maximum benefit of outdoor air, set enthalpy
control to A. See Fig. 29 and 30.
Accessory Differential Enthalpy Control — The control
(HH57AC077), in conjunction with the accessory enthalpy
sensor (HH57AC078), controls economizer operation ac-
cording to the differential enthalpy. The control is mounted
in the economizer hood. The sensor is mounted in the return
duct (50EJ/EK) or return air plenum (50EW/EY).
BLACK SEAL STRIP
(CENTERED)
FILTER COVER
NOTE: Switches shown in high enthalpy state. Terminals 2 and 3 close on en-
thalpy decrease.
Fig. 29 — Wire Connections for Solid State
Enthalpy Control (HH57AC077)
CONTROL POINT
CONTROL
Fig. 27 — Attaching Seal Strip
to Filter Cover
(APPROX. DEG.)
CURVE
AT 50% RH
A
B
C
D
73 (23)
70 (21)
67 (19)
63 (17)
HH57AC077
ENTHALPY CONTROL
HH57AC078
C7400A1004
ENTHALPY SENSOR
+
(USED WITH ENTHALPY
CONTROL FOR DIFFERENTIAL
ENTHALPY OPERATION)
RH
—
Relative Humidity
Fig. 28 — Differential Enthalpy Control
and Sensor
Fig. 30 — Psychrometric Chart for
Enthalpy Control
28
4. With screws saved from Step 1, install brackets on each
side of damper assembly.
5. Remove tape from damper blades.
Step 9 — Position Power Exhaust/Barometric
Relief Damper Hood — All electrical connections have
been made and adjusted at the factory. The power exhaust
blowers and barometric relief dampers are shipped as-
sembled and tilted back into the unit for shipping. Brackets
and extra screws are shipped in shrink wrap around the damp-
ers. If ordered, each unit will have 4 power exhaust blowers
and motors or 4 barometric relief dampers.
1. Remove 9 screws holding each damper assembly in place.
See Fig. 31. Each damper assembly is secured with 3 screws
on each side and 3 screws along the bottom. Save screws.
VAV DUCT PRESSURE TRANSDUCER — The VAV duct
pressure transducer (VAV inverter pressure transducer) is lo-
cated behind the filter access door on the lower inner panel.
1
See Fig. 32. A section of ⁄4-in. plastic tubing must be run
from the high-pressure tap on the differential pressure switch
and connected to a tap in the supply-air duct. The tap is usu-
ally located 2⁄3 of the way out on the main supply duct. Re-
move plug button in panel to route tubing.
2. Pivot each damper assembly outward until edges of damper
assembly rest against inside wall of unit.
VAV BUILDING PRESSURE TRANSDUCER — The VAV
building pressure transducer (modulating power exhaust pres-
sure transducer) is located behind the filter access door on
1
the inner panel. See Fig. 32. A section of ⁄4-in. plastic tub-
ing must be run from the high-pressure tap on the differen-
tial pressure switch to the conditioned space. The pressure
tube must be terminated in the conditioned space where a
constant pressure is required. This location is usually in an
entrance lobby so that the building exterior doors will open
and close properly. Remove plug button in panel to route
tubing.
Be careful when tilting blower assembly. Hoods
and blowers are heavy and can cause injury if
dropped.
3. Secure each damper assembly to unit with 6 screws across
top (3 screws provided) and bottom (3 screws from
Step 1) of damper.
NOTES:
1. Unless otherwise specified, all dimensions are to outside of part.
2. Dimensions are in inches.
Fig. 31 — Barometric Relief Damper and Power
Exhaust Mounting Details
29
VAV
—
Variable Air Volume
Fig. 33A — Motormaster III Sensor Location
(Sizes 024-034)
Fig. 32 — Pressure Transducer Locations
Step 10 — InstallAccessories — After all the factory-
installed options have been adjusted, install all field-
installed accessories. Refer to the accessory installation in-
structions included with each accessory.
MOTORMASTER III SENSOR LOCATION — Motor-
master III sensor locations are shown in Fig. 33A-33C. Re-
fer to the Motormaster III installation instructions for wiring
and installation information.
30
Fig. 33C — Motormaster III Sensor Location
(Size 048)
Fig. 33B — Motormasterா III Sensor Location
(Sizes 038 and 044)
31
3. Close the indoor fan circuit breaker. The VFD now is pow-
ered but the fan will not operate.
4. On the front of the VFD is a keypad and display which
will be used to enter the set point. To access this field,
press ‘‘SETUP’’key, then press the ‘‘SETUP’’key 6 times
to scroll to the sixth parameter, which will display
‘‘Sr1.’’ This is the VFD set point listed in Table 7.
START-UP
Use the following information and Start-Up Checklist on
page CL-1 to check out unit PRIOR to start-up.
Unit Preparation — Check that unit has been installed
in accordance with these installation instructions and appli-
cable codes.
5. Press the ‘‘READ/WRITE’’ key. The set point value will
be displayed. Use the up-arrow or down-arrow key to ad-
just the set point value to the value desired.
6. Press the ‘‘READ/WRITE’’ key again to enter the new
value.
Compressor Mounting — Loosen the compressor hold-
down bolts until sidewise movement of the washer under
each holddown bolt head can be obtained. Do not loosen
completely as bolts are self-locking and will maintain
adjustment.
7. Open the indoor fan circuit breaker.
8. Replace the jumper between CC and ST on the terminal
strip of the VFD.
9. Close the indoor fan circuit breaker, the VFD now is pow-
ered and the fan will operate.
Service Valves — Ensure that the suction, discharge,
and liquid line service valves are open. Damage to the com-
pressor could result if they are left closed.
Internal Wiring — Check all electrical connections in
unit control boxes; tighten as required.
NOTE: Any field measurement of supply fan amps must be
taken with an RMS meter between the fan circuit breaker
and fan contactor (upstream of VFD).
Refrigerant Service Ports — Each refrigerant sys-
tem has one suction port located in the top of the compressor
motor casing. All units also have one service port on the liq-
uid line valve and one on the compressor discharge valve.
Be sure that caps on the ports are tight.
Table 7 — VFD Set Point
Variable Frequency Drive (VFD) — The variable fre-
quency drives are factory set. These settings include factory-
installed jumpers and software configurations. The only
configured set point is duct static pressure.An Operation Manual
is shipped with each VAV unit. This manual should be
used if the drive needs to be customized for a particular
application.
To set the duct static pressure, perform the following steps.
The factory setting is zero. The duct transducer has a range
from 0 to 5 in. wg. The transducer output is 2 to 10 vdc,
therefore, 0 to 5 in. wg is proportional to the 2 to 10 vdc and
must be expressed to the VFD in terms of percentage of the
frequency range. To do this, refer to Table 7. The set point
value is a percentage of the maximum output frequency. Lo-
cate the duct static pressure closest to that desired and use
the corresponding set point value. If necessary, interpolation
between duct static pressures is permissible.
PRESSURE
(in. wg)
VOLTAGE
(vdc)
VFD
SET POINT
0.00
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
2.75
3.00
3.25
3.50
2.0
2.4
2.8
3.2
3.6
4.0
4.4
4.8
5.2
5.6
6.0
6.4
6.8
7.2
7.6
12.0
14.4
16.8
19.2
21.6
24.0
26.4
28.8
31.2
33.6
36.0
38.4
40.8
43.2
45.6
To set the VFD, the VFD must be powered up, however,
since it is located near the indoor air fan, operation of the
fan is not desirable. To disable the fan, perform the follow-
ing procedure:
VFD
—
Variable Frequency Drive
1. Open the indoor fan circuit breaker.
2. Remove the jumper between CC and ST on the terminal
strip of the VFD (see Fig. 34).
NOTE: Terminal strip is located inside the VFD (Variable Frequency
Drive) at the bottom.
Fig. 34 — VFD Factory-Installed Jumpers
32
At the top of the module are 2 potentiometers. The left
potentiometer adjusts the offset. The right potentiometer ad-
justs differential. The potentiometers are factory set for a
nominal 0 in. wg building pressure.
Power Exhaust — The optional non-modulating power
exhaust (CV only) is a two-stage design where the operation
of the exhaust fans is linked to economizer position. When
the supply fan is running and the economizer is 25% open,
the base module closes contacts, activating 2 exhaust fans.
When the economizer position reaches 75% open, the base
module activates the other 2 exhaust fans. The fans will turn
off when the economizer closes below the same points. The
economizer position set points that trigger the exhaust fans
can be modified, but only through use of the Service Tool,
Comfort Works, or Building Supervisor Software. If single-
stage operation is desired, adjust the economizer set points
to identical values at the desired point to activate all exhaust
fans.
The optional modulating power exhaust (VAV standard,
CV optional) is controlled by a modular electronic se-
quencer system. This system consists of a model R353 sig-
nal input module and 4 model S353 staging modules. The
signal input module receives a 0 to 10 vdc signal from the
building pressure transducer, which is mounted adjacent to
the supply static transducer behind the filter access panel.
The modules are mounted just below the unit control board.
The left module is the R353, and the 4 modules on the right
are S353 modules for stages 1 through 4. On the unit wiring
label, the R353 is designated PESC, and the S353 modules
are designated PES1 through PES4.
The offset set point is defined as the point at which a mod-
ule turns off a fan, and is measured in terms of percent of the
input signal. For control purposes, 0 offset is at an arbitrary
‘‘floor’’ which is established at 10% of the input signal, or
1 vdc. In this example, the first stage will turn off at 30%
(3 vdc), and the offset potentiometer will be set at 20%. The
second stage will turn off at 50% signal (5 vdc), and the off-
set potentiometer will be set at 40%. The fourth stage is at
the maximum 75% offset, which equates to 85% signal or
8.5 vdc. The offset potentiometer is calibrated in 10%
increments.
Table 8 relates building pressure to signal level.
Table 8 — Potentiometer Signal Levels
BUILDING PRESSURE
(in. wg)
SIGNAL LEVEL
(vdc)
−0.50
−0.25
0.00
2
4
6
0.25
8
0.50
10
If the building pressure is controlled at 0 in. wg, offset of
the first stage should be set at 50%, which equates to 60%
of the input signal, or 6 vdc. The other stages can then be set
as desired between 50% and 75%.
The default offset set points for modulating power ex-
haust are shown in Table 9.
The building pressure transducer range is −0.5 to
+0.5 in. wg. It is powered by a 0 to 10 vdc signal. A factory-
installed hose at the ‘‘Lo’’ connection leads to atmosphere,
and a field-supplied hose must be connected to the ‘‘Hi’’con-
nection and led into the building to a point where building
pressure is to be controlled. There is a plug button in the
bulkhead just above the transducers, for use in leading the
hoses into the building via the return air ductwork.
Table 9 — Power Exhaust Default Set Points
There are 3 adjustments at the R353 module, all of which
have been factory set. In the center of the circuit board is a
set of 4 pins with a jumper, labeled J2. This determines the
mode of operation. The bottom 2 pins must be jumpered for
direct operation. Direct operation means that the staging mod-
ules are activated in sequence as the input signal
increases.
OFF
DIFFE-
OFF
ON
STATIC
STAGE OFFSET
RENTIAL VOLTAGE VOLTAGE PRESSURE
(in. wg)
1
2
3
4
50%
55%
60%
64%
3%
3%
3%
3%
6.0
6.5
7.0
7.4
6.3
6.8
7.3
7.7
0.00
0.06
0.12
0.18
At the upper right corner of the board is a set of 5 pins and
jumper, which determines the time constant for the control.
The time constant is the delay in response built into the con-
trols. The jumper should be on the middle or bottom 2 pins,
for the maximum time constant. The delay can be decreased,
if desired, by moving the jumper progressively upward, al-
ways jumpering adjacent pins.
At the lower left corner of the board below the terminal
strip is a resistor marked R27. This must be removed in or-
der to obtain the 0 to 10 vdc signal output. There will not be
a resistor on a factory-supplied module, but a resistor may
be present on a replacement module and must be removed.
The R353 module has a terminal block with 7 connec-
tions available for wiring. The 2 right-hand terminals are for
the 24 vac and common connections. The next 2 terminals
are for the 0 to 10 vdc signal. Consult the wiring label for
wire identification if replacing the module. The 3 left-hand
terminals are not used for this application.
The S353 module has an LED (light-emitting diode), a set
of 4 jumper pins, and 2 potentiometers. The LED will light
whenever the module is activated, providing a visual indi-
cation of the number of exhaust fans running. The jumper
pins are arranged in a square format. Two jumpers are used
to determine the mode of operation (direct or reverse). The
2 jumpers must be arranged horizontally for direct action
(factory set).
The differential set point is the difference between the
turn off point and the turn on point for each module. It also
is calibrated in terms of percent of input signal, and has a
range of 1% to 7%. The differential potentiometer is cali-
brated in 1% increments, and is factory set at approximately
3%. It is recommended to leave the set point at 3%, to mini-
mize cycling of the fans.
The offset and differential potentioments have been fac-
tory set for atmosphereic pressure. Do not change these set-
tings until there is some experience with the building. In most
cases the factory settings will be satisfactory. However, if
the building pressure is not being maintained as desired, then
some minor adjusting on a trial and error basis can be made.
Direct Digital Controls DIP Switch Configura-
tion — The Direct Digital Control (DDC) board must be
configured for each application. The DDC board is config-
ured through the DIP switches located on the board. There
are 8 DIP switches which configure 8 different applications
of the DDC. See Tables 10A and 10B. DIP switch 1 is on the
left of the block. DIP switch 8 is on the right of the block.
To open a DIP switch, push the switch up with suitable tool
(small-blade screwdriver). To close a DIP switch, push the
switch down. Factory settings are shown in Tables 11A
and 11B.
33
Table 10A — DIP Switch Configuration (Version 1.0 of Unit Control Software)
SETTING
OPEN
1
2
3
4
5
6
7
8
Field
Test
ON
Modulated
Power
Exhaust
Time Guard Override
ON/ Set Min.
Damper Pos. ON
CCN/
Sensors
Expansion
I/O Board
VAV
Gas Heat
Factory Test ON
Field
Test
OFF
CV
Power
Exhaust
Time Guard Override
OFF/ Set Min.
Damper Pos. OFF
Base Board
Only
CLOSED
CV
TSTAT
Electric Heat
Factory Test OFF
LEGEND
NOTES:
1. The Factory Test DIP switch should not be enabled in the field.
2. The OPEN side of the DIP switch is marked ‘‘OPEN.’’ When the
rocker switch is on the ‘‘OPEN’’ side of the switch, the switch is
open.
3. If DIP switch no. 1 is open, DIP switch no. 2 is ignored, since VAV
units control to supply-air temperature.
CCN
CV
—
—
—
—
—
—
Carrier Comfort Network
Constant Volume
Input/Output
I/O
POS.
TSTAT
VAV
Position
Thermostat
Variable Air Volume
Table 10B — DIP Switch Configuration (Version 2.0 of Unit Control Software)
SETTING
OPEN
1
2
3
4
5
6
7
8
VAV —
VAV — Space Sensor
Installed
Occupied Time Guard Override
Heat
Enabled
ON
Expansion
Board
Field Test
ON
Heat Pump
Operation
VAV
Gas Heat
CV —
Modulated
Power
IN CONJUNCTION
WITH FIELD TEST
— Set Minimum
CV — CCN or Sensors
Used
Exhaust
Damper Position
VAV —
Occupied
Heat
VAV — No Space Sensor
CV — Thermostat
Disabled
Base Control Field Test
Board Only OFF
Time Guard Override
OFF
Air Conditioner
Operation
CLOSED CV
Electric Heat
CV —
Constant
Volume
Power
Exhaust
LEGEND
NOTES:
1. The OPEN side of the DIP switch is marked ‘‘OPEN.’’ When the
rocker switch is on the ‘‘OPEN’’ side of the switch, the switch is
OPEN.
CCN
CV
VAV
—
—
—
Carrier Comfort Network
Constant Volume
Variable Air Volume
2. The configuration of DIP switches 2 and 5 are dependent on DIP
switch 1. If DIP switch 1 is set to OPEN (VAV operation), then DIP
switches 2 and 5 will configure CV functions.
3. When the unit is field-tested (DIP switch 4 to OPEN), the function
of DIP switch 6 changes and it is used to set the minimum damper
position.
Table 11A — DIP Switch Factory Settings (Version 1.0 of Unit Control Software)
UNIT
1
2
3
4
5
6
7
8
50EJ/EW
50EK/EY
Closed
Open
Closed
Closed
Closed
Closed
Closed
Closed
Closed
Open
Closed
Closed
Closed
Closed
Closed
Closed
Table 11B — DIP Switch Factory Settings (Version 2.0 of Unit Control Software)
UNIT
1
2
3
4
5
6
7
8
50EJ/EW
50EK/EY
Closed
Open
Closed
Closed
Closed
Closed
Closed
Closed
Closed
Closed
Closed
Closed
Closed
Closed
Closed
Closed
34
DIP switch configurations for Version 1.0 of the Unit Con-
trol Software are as follows:
Filter Replacement — To replace filters, open filter
access door (marked with label). Remove inner access panel.
Remove plastic filter retainer in between filter tracks by slid-
ing and pulling outward. Remove first filter by sliding it out
of the opening in filter track. Locate filter removal tool, which
is shipped next to the return air dampers. Use the filter re-
moval tool to remove the remaining filters.
• DIP switch 1 configures the unit to operate as a variable
air volume (VAV) or constant volume (CV) unit
• DIP switch 2 configures what type of sensors or thermo-
stats are used with the unit
• DIP switch 3 configures the DDC for use with the elec-
tronic expansion board
Outdoor-Air Inlet Screens — Outdoor-air inlet screens
must be in place before operating unit.
• DIP switch 4 is used to field test the unit
• DIP switch 5 configures the unit to use constant volume or
modulated power exhaust
EconomizerAdjustment — Remove filter access panel.
Check that outdoor-air damper is closed and return-air damper
is open.
Economizer operation and adjustment is described in Se-
quence of Operation and Make Outdoor Air Inlet Adjust-
ments sections (this page and page 25), respectively.
• DIP switch 6 configures the Time Guard override and the
minimum damper position
• DIP switch 7 configures the unit for gas heat or electric
heat
• DIP switch 8 is used to factory test the unit
The DIP switch configurations for Version 2.0 of the unit
control software are as follows:
Sequence of Operation
NOTE: Unit is shipped with default values that can be changed
through Service Tool or CCN software.
• DIP switch 1 configures the unit to operate as a VAV or
CV unit
• DIP switch 2 configures the unit to use a space sensor (VAV
units) or a thermostat (CV units)
COOLING, CONSTANT VOLUME (CV) UNITS — On
power up, the control module will activate the initialization
software. The initialization software reads DIP switch no. 1
position to determine CV or VAV operation. Next, DIP switch
no. 2 is read to determine if the control is TSTAT or sensor
type operation. The initialization sequence: clears all alarms
and alerts; re-maps the input/output database for CV opera-
tion; sets maximum heat stages to 2; and sets maximum cool
stages to 3. The control module reads DIP switch no. 3 and
determines if the unit will use expansion mode operation.
The TSTAT function performs a thermostat based control
by monitoring Y1, Y2, W1, W2 and G inputs. These func-
tions control stages: cool1, cool2, heat1, heat2, and the in-
door fan respectively. If the TSTAT function is not selected,
the control module determines the occupancy state based on
the system time schedules or with remote occupied/unoccupied
input. If Temperature Compensated Start is active, the unit
will be controlled as in the Occupied mode. User defined set
points are shown in Table 17.
Occupied or unoccupied comfort set points must be se-
lected. Use of the space temperature offset input can also be
configured. The control module will set appropriate operat-
ing mode and fan control. The control module will turn on
indoor fan if in Occupied mode or if the unit is in Unoccu-
pied mode and the space temperature is outside of the un-
occupied comfort set points (Unoccupied Heat or Unoccu-
pied Cool). The control module will then monitor space
temperature against comfort set points and control heating
or cooling stages as required. If the system is in the Occu-
pied mode, the economizer will operate as required. If the
system is in Unoccupied mode, the system will perform night
time free cool and IAQ (indoor air quality) pre-occupancy
purge as required (when functions are enabled via software).
Whenever the DX (direct expansion) cooling is requested,
the outdoor fan will operate.
• DIP switch 3 configures the DDC for use with an elec-
tronic expansion board
• DIP switch 4 is used to field test the unit
• DIP switch 5 is used to enable occupied heating (VAV units)
or specify the type of power exhaust (CV units)
• DIP switch 6 configures the Time Guard override and, when
used with the field test function, sets the minimum damper
position
• DIP switch 7 configures the unit for gas heat or electric
heat
• DIP switch 8 configures the unit for heat pump or air con-
ditioner operation
Crankcase Heater(s) — Heater(s) is energized as long
as there is power to the unit, except when the compressors
are operating.
IMPORTANT: Unit power must be on for 24 hours
prior to start-up. Otherwise, damage to compressor may
result.
Evaporator Fan — Fan belt and fixed pulleys are factory-
installed. See Tables 12-14 for Fan Performance Data. See
Table 15 for Air Quantity Limits. See Table 16 for Motor
Limitation data. Be sure that fans rotate in the proper di-
rection. Static pressure drop for power exhaust, barometric
relief damper, and electric heat is negligible. To alter fan per-
formance, see Evaporator Fan Performance Adjustment sec-
tion on page 43.
Condenser Fans and Motors — Fans and motors
are factory set. Refer to Condenser-Fan Adjustment section
(page 44) as required.
Return-Air Filters — Check that correct filters are in-
stalled in filter tracks. See Table 1. Do not operate unit with-
out return-air filters.
35
Table 12 — Fan Performance, 50EJ/EK024-034 — Vertical Discharge Units
FOR EW/EY UNITS, REDUCE NET AVAILABLE EXTERNAL STATIC PRESSURE BY 0.3 IN. WG
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
(Cfm)
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
4,000
5,000
322
361
403
448
495
507
543
592
642
693
718
744
0.77
1.14
1.62
2.22
2.97
3.18
3.85
4.90
6.10
7.48
8.23
9.03
401
433
468
508
549
560
593
638
685
733
757
781
1.09
1.50
2.01
2.65
3.42
3.64
4.34
5.41
6.64
8.04
8.80
9.62
466
494
526
561
599
609
639
682
725
771
794
1.43
1.86
2.41
3.08
3.88
4.10
4.82
5.91
7.17
8.60
9.37
523
548
577
609
645
654
682
722
764
807
829
1.78
2.23
2.81
3.50
4.33
4.56
5.30
6.42
7.70
9.15
9.94
575
598
624
654
687
696
723
760
800
841
862 10.51
884 11.36
917 12.71
928 13.19
2.13
2.62
3.21
3.93
4.79
5.02
5.78
6.93
8.24
9.71
622
643
668
696
727
735
761
797
835
874 10.26
895 11.08
915 11.93
947 13.31
958 13.79
2.50
3.00
3.62
4.37
5.25
5.49
6.27
7.44
8.77
666
686
709
736
765
773
797
832
868
2.87
3.40
4.04
4.81
5.71
5.96
6.76
7.95
9.30
707
726
748
773
801
809
832
865
900
3.25
3.80
4.46
5.25
6.18
6.43
7.24
8.46
9.84
6,000
7,000
8,000
8,250
9,000
10,000
11,000
12,000
12,500
13,000
13,750
14,000
15,000
906 10.82
926 11.64
946 12.51
977 13.90 1005 14.50
987 14.39 1015 14.99
937 11.38
956 12.21
975 13.09
817 10.20
852 11.52
864 11.98
912 13.96
851 10.78
885 12.12
896 12.59
943 14.59
783 10.32
795 10.77
847 12.71
818 10.92
831 11.38
880 13.34
972 15.21 1001 15.83 1029 16.45 1056 17.08
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
2.2 2.4 2.6 2.8
AIRFLOW
(Cfm)
1.8
2.0
3.0
3.2
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
4,000
5,000
746
764
785
809
836
843
865
897
3.64
4.21
4.89
5.70
6.65
6.91
7.74
8.98
783
800
820
843
869
876
898
928
4.03
4.62
5.32
6.16
7.12
7.39
8.23
9.49
818
834
854
876
901
908
929
4.44
5.04
5.76
6.61
7.60
7.87
8.73
852
868
886
908
932
938
959
4.85
5.46
6.21
7.08
8.08
8.36
9.23
884
900
918
939
962
968
988
5.26
5.89
6.65
7.54
8.57
8.84
916
930
948
968
991
997
5.68
6.33
7.11
8.01
946
960
977
997
6.11
6.77
975
989
6.54
7.22
8.02
8.96
6,000
7.56 1006
8.49 1025
7,000
8,000
9.05 1019
9.34 1025
9.55 1046 10.04
9.83 1052 10.33
8,250
9,000
9.74 1016 10.24 1043 10.75 1070 11.27
10,000
11,000
12,000
12,500
13,000
13,750
14,000
15,000
958 10.01
990 11.45 1018 11.99 1046 12.54 1073 13.08 1099 13.63 1124 14.18
996 12.49 1024 13.06 1051 13.62 1078 14.18 1104 14.75 1129 15.31 1154 15.88
987 10.53 1016 11.06 1043 11.58 1070 12.11 1096 12.64
931 10.37
967 11.94
961 10.91
985 12.78 1014 13.35 1041 13.92 1068 14.49 1094 15.07 1120 15.64 1145 16.22 1169 16.80
1004 13.67 1032 14.25 1059 14.83 1086 15.42
1111 16.00 1137 16.59 1161 17.17 1185 17.76
1033 15.09 1060 15.69 1087 16.29 1112 16.88 1138 17.48 1162 18.08 1186 18.68
1043 15.59 1070 16.19 1096 16.79 1122 17.40 1147 18.00 1171 18.60 1195 19.21
—
—
—
—
—
—
1083 17.70 1109 18.32 1134 18.94 1159 19.56 1183 20.19
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
(Cfm)
LEGEND
Brake Horsepower
3.4
3.6
3.8
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Bhp
—
4,000
5,000
1004
1017
1034
1052
1073
1079
1096
1122
1149
1178
1193
—
6.97
7.67
8.49
9.44
10.54
10.84
11.78
13.18
14.73
16.45
17.38
—
1032
1045
1061
1079
1099
1105
1122
1147
1173
1202
—
7.41
8.12
8.96
9.93
11.04
11.34
12.30
13.71
15.29
17.03
—
1059
1072
1087
1105
1125
1130
1147
1171
1197
—
7.86
8.58
9.43
10.42
11.55
11.85
12.82
14.25
15.84
—
NOTES:
1. Fan performance is based on wet coils, economizer, roof curb,
cabinet losses, and clean 2-in. filters.
6,000
7,000
2. Conversion — Bhp to watts:
8,000
Bhp x 746
Watts =
8,250
9,000
Motor efficiency
10,000
11,000
12,000
12,500
13,000
13,750
14,000
15,000
3. VAV units will operate down to 70 cfm/ton.
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
36
Table 13 — Fan Performance, 50EJ038,044 and 50EK044 — Vertical Discharge Units
For EW/EY UNITS, REDUCE NET AVAILABLE EXTERNAL STATIC PRESSURE BY 0.5 IN. WG
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
(Cfm)
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
8,000
9,000
448
492
537
582
629
675
722
770 10.00
817 11.76
865 13.70
913 15.83
961 18.16
2.18
2.87
3.69
4.65
5.75
7.00
8.42
498
537
578
620
664
708
753 10.11
798 11.94
844 13.96
890 16.19
937 18.64
2.87
3.68
4.63
5.75
7.02
8.48
544
580
617
657
698
739
782 10.63
826 12.48
870 14.53
915 16.78
961 19.25
3.25
4.09
5.07
6.20
7.50
8.98
589
621
655
692
730
770
811 11.16
853 13.03
896 15.09
940 17.37
3.64
4.50
5.50
6.66
7.98
9.48
631
660
692
726
763
800
840 11.69
880 13.57
922 15.66
964 17.95
4.04
4.92
5.95
7.13
8.47
9.99
671
698
727
759
794
830 10.50
868 12.22
907 14.13
947 16.23
4.44
5.35
6.39
7.60
8.96
710
734
761
792
824
859 11.01
895 12.75
932 14.68
971 16.81
4.86
5.78
6.85
8.07
9.45
747
769
795
823
854
887 11.53
922 13.29
958 15.24
995 17.38
5.27
6.22
7.30
8.55
9.95
10,000
11,000
12,000
13,000
14,000
15,000
16,000
17,000
18,000
19,000
20,000
988 18.54 1011 19.14 1034 19.73
984 19.85 1007 20.46 1030 21.07 1052 21.68 1074 22.30
984 21.32 1006 21.94 1029 22.56 1050 23.19 1072 23.82 1093 24.45 1115 25.08
1009 20.69 1031 24.22 1052 24.86 1074 25.50 1095 26.15 1115 26.80 1136 27.45 1156 28.10
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
(Cfm)
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
8,000
9,000
783
803
827
854
883 10.45
914 12.05
948 13.83
5.70
6.66
7.77
9.03
818
836
858
884
911 10.96
942 12.57
974 14.37
6.13
7.11
8.23
9.51
852
869
889
913 10.00
939 11.47
968 13.10
6.56
7.56
8.70
884
900
919
7.00
8.02
9.18
916
930
948
7.45
8.48
9.66
947
960
7.90
8.95
978
989
8.36 1007
9.42 1018
8.82
9.90
10,000
11,000
12,000
13,000
14,000
15,000
16,000
17,000
18,000
19,000
20,000
977 10.15 1005 10.64 1032 11.13
997 11.50 1024 12.01 1050 12.52
941 10.50
967 11.98
969 11.00
993 12.50 1020 13.02 1046 13.54 1071 14.07
994 13.63 1020 14.17 1045 14.71 1070 15.25 1094 15.79
999 14.92 1024 15.47 1049 16.02 1073 16.58 1096 17.14 1120 17.70
983 15.80 1007 16.36 1032 16.92 1056 17.49 1079 18.06 1102 18.64 1125 19.21 1148 19.79
1019 17.96 1043 18.54 1066 19.13 1089 19.71 1111 20.30 1134 20.89 1156 21.49 1177 22.08
1057 20.33 1079 20.93 1102 21.53 1124 22.14 1145 22.75 1167 23.35 1188 23.97
1096 22.91 1117 23.53 1138 24.15 1160 24.78 1180 25.40
1135 25.72 1156 26.36 1176 26.99 1197 27.63
1176 28.75 1196 29.41
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
3.4 3.6 3.8
LEGEND
AIRFLOW
(Cfm)
Bhp
—
Brake Horsepower
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
NOTES:
8,000
9,000
1036
1046
1059
1076
1096
1118
1143
1170
1199
—
9.29
10.38
11.63
13.03
14.60
16.34
18.26
20.37
22.68
—
1065
1073
1086
1102
1121
1142
1166
1192
—
9.76
10.87
12.13
13.55
15.13
16.89
18.83
20.96
—
1092
1100
1112
1127
1145
1165
1188
—
10.24
11.36
12.64
14.07
15.67
17.45
19.40
—
1. Fan performance is based on wet coils, economizer, roof curb,
cabinet losses, and clean 2-in. filters.
2. Conversion − Bhp to watts:
10,000
11,000
12,000
13,000
14,000
15,000
16,000
17,000
18,000
19,000
20,000
Bhp x 746
Watts =
Motor efficiency
3. VAV units will operate down to 70 cfm/ton.
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
37
Table 14 — Fan Performance, 50EJ048 — Vertical Discharge Units
FOR EW UNITS, REDUCE NET AVAILABLE EXTERNAL STATIC PRESSURE BY 0.5 IN. WG
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
(Cfm)
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
13,000
14,000
15,000
16,000
17,000
18,000
19,000
20,000
683
730
778 10.14
826 11.93
875 13.90
923 16.06
972 18.42
7.10
8.53
715
8.59
747
9.09
777
9.60
808 10.11
847 11.83
888 13.75
931 15.86
973 18.19
837 10.62
875 12.36
915 14.30
955 16.44
866 11.14
902 12.90
941 14.86
894 11.66
929 13.44
966 15.42
761 10.25
807 12.10
853 14.15
900 16.42
947 18.90
790 10.77
834 12.65
879 14.72
925 17.01
971 19.51
819 11.30
862 13.19
905 15.29
949 17.60
980 17.01 1004 17.59
997 18.78 1020 19.38 1043 19.98
994 20.12 1017 20.73 1039 21.34 1062 21.96 1084 22.58
995 21.61 1017 22.24 1039 22.87 1061 23.50 1083 24.13 1104 24.76 1125 25.40
1021 20.98 1042 24.55 1064 25.20 1085 25.85 1106 26.50 1126 27.15 1147 27.80 1167 28.46
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
(Cfm)
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
Rpm
Bhp
Rpm
948 12.71
981 14.53 1006 15.08 1031 15.63 1056 16.18 1080 16.74 1103 17.30 1127 17.86
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
13,000
14,000
15,000
16,000
17,000
18,000
19,000
20,000
921 12.18
955 13.98
975 13.24 1001 13.77 1026 14.30 1051 14.84 1076 15.39 1100 15.93
991 15.98 1015 16.54 1040 17.11 1063 17.68 1087 18.25 1110 18.83 1133 19.41 1155 19.99
1028 18.17 1051 18.76 1074 19.34 1097 19.93 1120 20.52 1142 21.12 1164 21.71 1185 22.31
1066 20.58 1089 21.18
1111 21.78 1133 22.39 1154 23.00 1175 23.61 1197 24.23
—
—
—
—
—
—
—
—
1106 23.19 1127 23.82 1148 24.44 1169 25.07 1190 25.69
—
—
—
—
—
—
—
—
—
—
—
—
1146 26.04 1166 26.68 1187 27.32
1187 29.11
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
3.4 3.6 3.6
AIRFLOW
(Cfm)
Bhp
—
Brake Horsepower
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
NOTES:
13,000
14,000
15,000
16,000
17,000
18,000
19,000
20,000
1124
1150
1177
—
16.48
18.43
20.57
—
1148
1173
1199
—
17.03
19.00
21.16
—
1171
1195
—
17.59
19.57
—
1. Fan performance is based on wet coils, economizer, roof curb,
cabinet losses, and clean 2-in. filters.
2. Conversion − Bhp to watts:
—
—
Bhp x 746
Watts =
—
—
—
—
—
—
—
—
—
—
—
—
Motor efficiency
—
—
—
—
—
—
3. VAV units will operate down to 70 cfm/ton.
—
—
—
—
—
—
Table 15 — Air Quantity Limits
UNIT
50EJ,EK,EW,EY
MINIMUM HEATING
CFM
MINIMUM COOLING
CFM (VAV)
MINIMUM COOLING
CFM (CV)
MAXIMUM
CFM
024
028
030
034
038
044
048
6,000
7,500
2000
2500
2750
3000
3500
4000
4500
6,000
7,500
10,000
12,500
13,750
15,000
17,500
20,000
22,500
8,250
8,250
9,000
9,000
10,500
12,000
13,500
10,500
12,000
13,500
LEGEND
CV
VAV
—
—
Constant Volume
Variable Air Volume
38
Table 16 — Motor Limitations
STANDARD EFFICIENCY MOTORS
Maximum Amps
Nominal
Hp
Maximum
Bhp
Maximum
Watts
Motor
Efficiency
208
17.94
—
230
16.99
—
460
—
575
—
5.9
5.9
5,348
5,240
82.3
84.0
84.1
82.9
85.7
85.6
83.4
84.5
87.8
87.5
88.0
87.1
90.4
88.3
5
8.50
—
5.78
—
8.7
25.52
—
24.36
—
7,717
7.5
10
15
20
25
30
9.5
13.30
—
9.63
—
8,549
10.2
11.8
15.3
18.0
22.4
23.4
28.9
29.4
35.6
34.7
26.93
—
25.50
—
8,879
14.75
—
11.33
—
10,284
13,686
15,891
19,032
19,950
24,499
25,181
29,378
29,316
42.84
—
40.80
—
24.00
—
18.00
—
59.36
—
56.00
—
29.25
—
22.82
—
76.30
—
72.83
—
37.04
—
28.69
—
92.56
—
87.81
—
42.80
n/a
HIGH EFFICIENCY MOTORS
Maximum Amps
Nominal
Hp
Maximum
Bhp
Maximum
Watts
Motor
Efficiency
208
16.76
—
230
13.92
—
460
—
575
—
5.9
5.9
5,030
5,030
87.5
87.5
89.5
88.5
88.5
91.7
89.5
89.5
91.0
91.0
91.0
93.0
91.0
91.0
93.6
91.7
91.7
93.6
92.4
92.4
93.6
5
6.96
—
—
5.9
—
—
5.66
—
4,918
8.7
26.10
—
22.27
—
—
7,334
7.5
10
15
20
25
30
9.5
12.16
—
—
8,008
9.5
—
—
9.50
—
7,728
10.2
11.8
11.8
15.3
18.0
18.0
22.4
23.4
23.4
28.9
29.4
29.4
35.6
34.7
34.7
28.56
—
24.89
—
—
8,502
14.40
—
—
9,836
—
—
11.68
—
9,600
45.08
—
39.17
—
—
12,543
14,756
14,439
18,363
19,183
18,650
23,511
23,918
23,432
28,742
28,015
27,656
23.04
—
—
—
—
18.12
—
63.84
—
55.55
—
—
29.02
—
—
—
—
23.17
—
80.69
—
70.05
—
—
35.63
—
—
—
—
28.81
—
102.65
—
89.00
—
—
43.38
—
—
—
—
33.89
NOTE: Extensive motor and electrical testing on the Carrier units has ensured
that the full horsepower range of the motor can be utilized with confidence.
Using your fan motors up to the horsepower ratings shown on the Motor Limi-
tations table will not result in nuisance tripping or premature motor failure. Unit
warranty will not be affected.
LEGEND
Brake Horsepower
BHP
—
Table 17 — User Defined Set Points
SET POINT
OHSP
OCSP
UHSP
UCSP
SASP
OATL
NTLO
RTIO
FORMAT
xx.xF
xx.xF
xx.xF
xx.xF
xx.xF
xx.xF
xx.xF
xx.x
DESCRIPTION
Occupied Heat Set Point
Occupied Cool Set Point
Unoccupied Heat Set Point
Unoccupied Cool Set Point
Supply Air Set Point
LIMITS
55 to 80 F
55 to 80 F
40 to 80 F
75 to 95 F
45 to 70 F
55 to 75 F
40 to 70 F
0 to 10
DEFAULT
68
78
55
90
55
65
50
3
Hi OAT Lockout Temperature
Unoccupied OAT Lockout Temperature
Reset Ratio
LIMT
xx.x^F
xxx%
xxxx
Reset Limit
0 to 20 F
0 to 100%
1 to 5000
0 to 10
10
20
650
1
MDP
Minimum Damper Position
IAQ Set Point
IAQS
UHDB
UCDB
LTMP
HTMP
PES1
PES2
xx.x^F
xx.x^F
xx.xF
xx.xF
xx.xF
xx.xF
Unoccupied Heating Deadband
Unoccupied Cooling Deadband
Low Temp. Min. Position
High Temp. Min. Position
CV Power Exhaust Stage 1 Point
CV Power Exhaust Stage 2 Point
0 to 10
1
0 to 100
10
35
25
75
0 to 100
0 to 100
0 to 100
LEGEND
CV
IAQ
OAT
—
—
—
Constant Volume
Indoor Air Quality
Outdoor Air Temperature
39
The control module will operate economizer, run diag-
nostics to monitor alarms/alerts at all times, and respond to
CCN communications to perform any configured network
POC (product outboard control) functions such as time/
outdoor-air temperature broadcast and global occupancy broad-
cast. When the optional expansion I/O board is employed, it
will: perform a periodic scan and maintain a database of ex-
panded I/O points; perform Fire/Smoke control (power ex-
haust required); if in Occupied mode, perform IAQ control
and monitor the fan, filter, demand limit, and field-applied
status (with accessories).
If thermostats are used to energize the G input, the control
module will turn on the indoor fan without delay and open
the economizer dampers to minimum position. If thermo-
stats are used to deenergize the G input, the control module
will turn off the indoor fan without delay and close the econo-
mizer dampers.
When cooling, G must be energized before cooling can
operate. The control module determines if outdoor condi-
tions are suitable for economizer cooling using the standard
outdoor air thermistor. For the economizer to function for
outside air cooling: the enthalpy must be below the enthalpy
set point; the outdoor-air temperature must be equal to or
less than the High Outdoor Air Temperature Lockout (de-
fault is 65 F); the SAT (supply-air temperature) thermistor
must not be in alarm; and the outdoor air reading is avail-
able. When these conditions are satisfied, the control mod-
ule will use economizer as the first stage of cooling.
When Y1 input is energized, the economizer will be modu-
lated to maintain SAT at the defined set point. (The default
is 55 F.) When SAT is above the set point, the economizer
will be 100% open. When SAT is below the set point, the
economizer will modulate between minimum and 100% open
position. When Y2 is energized, the control module will turn
on compressor 1 and continue to modulate the economizer
as described above. If the Y2 remains energized and the SAT
reading remains above the set point for 15 minutes, com-
pressor 2 will turn on. If Y2 is deenergized at any time, only
the last stage of compression that was energized will be turned
off. If outdoor conditions are not suitable for economizer cool-
ing, the economizer will go to minimum position and cycle
compressors 1 and 2 based on demand from Y1 and Y2 re-
spectively. The compressors will be locked out when the SAT
temperature is too low (less than 40 F for compressor 1 and
less than 45 F for compressor 2). After a compressor is locked
out, it can restart after normal time-guard period.
commands to the base unit module. If a linkage is active, the
control module will replace local comfort set points, space
and return air temperatures, and occupancy status with the
linkage data supplied.
The control module will determine occupancy status from
Time Schedules (if programmed), Remote Occupied/
Unoccupied input, global occupancy schedules, or DAV. If
temperature compensated start is active, the unit will be con-
trolled as in the Occupied mode.
NOTE: The temperature compensated start is a period of time
calculated to bring the unit on while in Unoccupied mode to
reach the occupied set point when occupancy occurs.
The control module will set the appropriate operating mode
and fan control. The control module will turn on the VFD if
Occupied mode is evident. If in Unoccupied mode and a valid
space temperature reading is available (either from a sensor
or DAV), the control module will monitor SPT (space tem-
perature) against unoccupied heat and cool set points. The
control module will start the VFD whenever SPT is outside
of the set points (Unoccupied Heat or Unoccupied Cool).
The VFD may also be started by nighttime thermostat via
remote Occupied/Unoccupied input or by a temperature com-
pensated start algorithm. When the VFD is running in a nor-
mal mode, the control module will start heating or cooling
as required to maintain supply-air temperature at the supply
air set point plus the reset (when enabled). The reset value
is determined by SAT (supply-air temperature) reset and/or
space temperature reset algorithms. The reset is only avail-
able when enabled through software.
When cooling, the control module will energize the power
exhaust enable output to the external power exhaust control-
ler (when power exhaust is used).
The control module will run continuous diagnostics for
alarms/alerts; respond to CCN (Carrier Comfort Network)
communications; perform any configured network POC (Prod-
uct Outboard Control) functions such as time/outdoor air tem-
perature broadcast and global broadcast; and perform Fire/
Smoke control.
HEATING, CONSTANT VOLUME (CV) UNITS — The
control module is powered by 24 vac. If the unit is con-
trolled with a room sensor, the fan will run continuously in
the Occupied mode, with the outside-air damper in the mini-
mum position. If the unit is controlled through a room ther-
mostat (with FAN set to AUTO), upon a call for heat the first
stage of heat is energized, the indoor-fan motor will turn on,
and the outdoor-air damper will move to the minimum po-
sition. Upon a call for additional heat (if the unit is equipped
with a two-stage heater), the second stage of heat is ener-
gized. When the call for heat is satisfied, the heaters will
deenergize. The indoor-fan motor will also deenergize (un-
less controlled by a room sensor) and the outdoor-air damper
will move to the closed position.
If the unit is controlled with a room sensor the fan will not
run in the unoccupied mode. Upon a call for heat, the first
stage of heat is energized, the indoor-fan motor will turn on,
and the outdoor air damper will move to the Unoccupied
IAQ position (generally set to zero in the unoccupied mode).
The IAQ feature is enabled through system software. Upon
a call for additional heat (if the unit is equipped with a two-
stage heater), the second stage of heat is energized. When
the call for heat is satisfied, the heaters and indoor-fan motor
will deenergize and the outdoor-air damper will move to the
closed position (if open).
The Time Guard function maintains a minimum off time
of 5 minutes, a minimum on time of 10 seconds, and a
minimum delay before starting the second compressor of
10 seconds.
When heating, the heat stages respond to the demand from
W1 and W2 of the thermostat input. Heating and cooling
will be mutually locked-out on demand on a first call basis.
The heating and the cooling functions cannot operate
simultaneously.
COOLING, VARIABLE VOLUME UNITS — On power up,
the control module will activate the initialization software.
The initialization software reads DIP switch no. 1 position
to determine CV or VAV operation. The initialization se-
quence: clears all alarms and alerts; re-maps the input/
output database for VAV operation; sets maximum heat stages
to 1; and sets maximum cool stages to 6. The control module
reads DIP switch no. 3 and determines if the unit will use
expansion mode operation. Power up takes a random time of
1 to 63 seconds plus 5 minutes the first time power is sent
to the control board after a power outage.
HEATING, VARIABLE AIR VOLUME (VAV) UNITS —
The control board is powered by 24 vac. When there is a call
for heating (from Morning Warm-Up, Unoccupied, or Oc-
cupied modes), power is sent from the control module to
energize the first stage of electric heat. A field-supplied heat
The control module will determine if an interface (link-
age) is active and if the unit will operate in a Digital Air
Volume (DAV) mode. In a DAV system, the room terminals
are equipped with microprocessor controls that give
40
interlock relay signals for the air terminals to fully open. See
Fig. 35. In the Occupied mode, the indoor-fan motor will
operate continuously and the outdoor-air dampers will be in
the minimum position. In the Unoccupied mode, the indoor-
fan motor will be off, but will energize upon the call for heat.
The outdoor-air dampers will move to the IAQ unoccupied
position (generally set to zero in the Unoccupied mode). The
IAQ feature is enabled through system software. The duct
pressure sensor will signal to the variable frequency drive to
operate at full speed. Upon a call for additional heat (if the
unit is equipped with a two-stage heater), the second stage
of heat will be energized. When the call for heat is satisfied,
the heaters will deenergize.
The field-supplied space temperature sensor input signal
(4 to 20 ma and 2 to 10 vdc) enables the space temperature
reset function. Refer to Fig. 36 for sensor wiring.
POWER EXHAUST OPERATION — The optional power
exhaust packages are factory- or field-installed with vertical
units and optionally installed in the return air ductwork for
horizontal applications. The standard (only offered with con-
stant volume units) and modulating power exhaust (offered
on VAV units) are the 2 packages available. The modulating
power exhaust package is equipped with a field-adjustable
static pressure controller which will control up to 4 power
exhaust stages to maintain a building static pressure. The blue
sequencer located in the control box below the control board
can be adjusted by removing the covers and adjusting the set
point dial to the desired building pressure. The standard power
exhaust package controls up to 2 stages of power exhaust to
maintain building pressure. These power exhaust stages are
staged according to a percentage of the economizer damper
position. The default values are 25% for Stage 1 and 75%
for Stage 2. This package has set points that are adjustable
through software (such as Service Tool, Building Supervi-
sor, or Comfort Works).
NOTE: The HIR is not needed in a DAV system.
If the unit is in the Unoccupied mode, the indoor-fan mo-
tor will deenergize and the outdoor-air damper will move to
the closed position (if open).
MORNING WARM-UP (VAV ONLYWITH PC ACCESSED/
CCN OPERATION) — Morning warm-up occurs when the
control module has been programmed to turn on heat, prior
to the Occupied mode, to be ready for the occupancy. Morn-
ing warm-up is a condition in VAV systems that occurs when
the Temperature Compensated Start algorithm calculates a
biased occupied start time and the unit has a demand for heat-
ing. The warm-up will continue into the occupied period as
long as there is a need for heat. During warm-up, the unit
can continue heating into the occupied period, even if oc-
cupied heating is disabled. When the heating demand is sat-
isfied, the warm-up condition will terminate. To increase or
decrease the heating demand, use the network access soft-
ware to change the occupied heating set point.
NOTE: To utilize morning warm-up mode, the unit occu-
pancy schedule must be accessed via Service Tool, Comfort
Works, or Building Supervisor software (units running Ver-
sion 1.0 of unit control software).
MORNING WARM-UP (VAV ONLYWITH STAND-ALONE
OPERATION) — When a unit running version 2.0 of the
unit control software operates in stand-alone mode, morning
warm-up occurs when the unit is energized in Occupied mode
and return-air temperature (RAT) is below 68 F. Warm-up
will not terminate until the RAT reaches 68 F. The heat in-
terlock relay output is energized during morning warm-up.
(A field-installed 24-vdc heat interlock relay is required.) The
output will be energized until the morning warm-up cycle is
complete. Refer to Fig. 35 for heat interlock relay wiring.
Fig. 35 — Heat Interlock Relay Wiring
SPACE TEMPERATURE RESET (VAV ONLY) — An ac-
cessory space temperature sensor is required. Space tem-
perature reset is used to reset the supply-air temperature set
point of a VAV system higher, as the space temperature falls
below the Occupied Cool set point. As the space tempera-
ture falls below the cool set point, the supply-air tempera-
ture will be reset upward as a function of the reset ratio. Re-
set ratio is expressed in degrees change in supply-air temperature
per degree of space temperature change. A reset limit will
exist which will limit the maximum number of degrees the
supply-air temperature may be raised. Both the reset ratio
and the reset limit are user definable. The sequence of op-
eration is as follows:
1. The on/off status of the unit supply fan is determined.
2. If the fan is on, the sequence will check if the system is
in Occupied mode.
3. If the system is in Occupied mode, the sequence will de-
termine if the reset option is enabled.
4. If the reset option is enabled, the sequence will read the
space temperature and compare it to the Occupied Cool
set point. If the temperature is below the Occupied Cool
set point, the algorithm will compute the reset value and
compare this value against the reset limit. If it is greater
than the reset limit, the sequence will use the reset limit
as the reset value.
Fig. 36 — Space Temperature Sensor Wiring
41
CAPACITY CONTROL, COOLING — The cooling capac-
ity staging tables are shown in Tables 18 and 19.
MOTORMASTER III DEVICE — The Motormaster III
Solid-State Head Pressure Control is a field-installed acces-
sory, fan speed control device actuated by a temperature sen-
sor. The Motormaster III device is specifically designed for
use on Carrier equipment and controls the outdoor-fan mo-
tor speed in response to the saturated condensing tempera-
ture. For outdoor temperatures down to −20 F, the Motor-
master III device maintains condensing temperature at
100 F.
Table 18 — Cooling Capacity Staging Table
CV Units with 2 Compressors
1
STAGES
0
2
3
ECONOMIZER
Compressor 1
Compressor 2
Off
Off
Off
Off
On
Off
On
On
NOTE: On CV units that require additional unloading, add suction pres-
sure unloaders on Compressor 1 only.
SERVICE
Table 19 — Cooling Capacity Staging Table
VAV Units with 2 Compressors
and 2 Unloaders*
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Turn off ac-
cessory heater power switch if applicable. Electrical shock
could cause personal injury.
STAGES
Compressor 1
Unloader 1
0
1
2
3
4
5
6
Off
Off
Off
Off
On
On
On
Off
On
On
Off
Off
On
Off
Off
Off
On
On
On
On
On
On
Off
On
On
Off
Off
On
Service Access — All unit components can be reached
through clearly labelled hinged access doors. These doors
are not equipped with tiebacks, so if heavy duty servicing is
needed, either remove them or prop them open to prevent
accidental closure.
Unloader 2
Compressor 2
*40 ton units have only 1 unloader.
Each door is held closed with 3 latches. The latches are
secured to the unit with a single 1⁄4-in. - 20 x 1⁄2-in. long bolt.
See Fig. 37.
To open, loosen the latch bolt using a 7⁄16-in. wrench. Pivot
the latch so it is not in contact with the door. Open the door.
To shut, reverse the above procedure.
NOTE: Disassembly of the top cover may be required under
special service circumstances. It is very important that the
orientation and position of the top cover be marked on the
unit prior to disassembly. This will allow proper replace-
ment of the top cover onto the unit and prevent rainwater
from leaking into the unit.
FIELD TEST — The field test program is initiated by mov-
ing up DIP switch no. 4 to the OPEN position. The outdoor-
air damper will close. The control allows 90 seconds for the
damper to close in case it was in the full open position. Next,
the indoor-fan contactor will be energized, and the outside-
air damper will begin to open to its default value of 20% and
stay at that position for a short period of time. The outdoor-
air damper will then open to its full open position and stay
at that position for a short period of time. The outdoor-air
damper will then close.
If the unit is equipped with power exhaust, stage 1 will be
energized for 5 seconds. If the unit is configured for stage 2
of power exhaust, stage 2 will be energized for 5 seconds
after the first stage is deenergized.
IMPORTANT: After servicing is completed, make sure
door is closed and relatched properly, and that the latches
are tight. Failure to do so can result in water leakage
into the evaporator section of the unit.
The first stage of heat will be energized for 30 seconds,
after which the second stage heat will be energized for an
additional 30 seconds. Heat is then deenergized.
The last step is the Cooling mode. Outdoor-fan contactor
no. 1 is energized. This is followed by each stage of cooling
energized with a 10-second delay between stages. After this
is complete, outdoor-fan contactor no. 2 is energized for
10 seconds.
The compressors will now deenergize, followed by the
outdoor-fan contactors and indoor-fan contactors.
The field test is then complete.
TIME GUARD CIRCUIT — The Time Guard function (built
into the rooftop’s control module board) maintains a mini-
mum off time of 5 minutes and a minimum on time of
10 seconds.
CRANKCASE HEATER — The unit main power supply must
remain on to provide crankcase heater operation. The crank-
case heater in each compressor keeps oil free of refrigerant
while compressor is off.
Fig. 37 — Door Latch
HEAD PRESSURE CONTROL — Each unit has a fan cy-
cling, outdoor thermostat to shut off outdoor-fan motor(s) at
55 F (one outdoor-fan motor on 024-034 units and 2 outdoor-
fan motors on 038-048 units). The head pressure control per-
mits the unit to operate with correct condensing temperatures
down to 35 F outdoor-air temperature.
42
CONDENSER AND EVAPORATOR-FAN MOTOR BEAR-
INGS — The condenser and evaporator-fan motors have
permanently-sealed bearings, so no field lubrication is
necessary.
Cleaning — Inspect unit interior at beginning of each heat-
ing and cooling season and as operating conditions require.
Remove unit top panel and/or side panels for access to unit
interior.
EVAPORATOR COIL — Clean as required with a commer-
cial coil cleaner.
Evaporator Fan Performance Adjustment
(Fig. 38) — Fan motor pulleys are factory set for speed
shown in Table 1 (factory speed setting).
CONDENSER COIL — Clean condenser coil annually and
as required by location and outdoor-air conditions. Inspect
coil monthly — clean as required.
To change fan speeds, change pulleys.
To align fan and motor pulleys:
1. Shut off unit power supply.
2. Loosen fan shaft pulley bushing.
3. Slide fan pulley along fan shaft.
4. Make angular alignment by loosening motor from mount-
ing plate.
5. Retighten pulley.
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
cooling season, or more often if operating conditions re-
quire. Refer to Table 1 for type and size.
NOTE: The unit requires industrial grade throwaway filters
capable of withstanding face velocities up to 625 fpm.
IMPORTANT: Check to ensure that the unit drive
matches the duct static pressure in Tables 12 to 14.
OUTDOOR-AIR INLET SCREENS — Clean screens with
steam or hot water and a mild detergent. Do not use throw-
away filters in place of screens.
Evaporator Fan Service and Replacement
1. Turn off unit power.
Lubrication
2. Remove supply-air section panels.
3. Remove belt and blower pulley.
4. Loosen set screws in blower wheels.
5. Remove locking collars from bearings.
6. Remove shaft.
7. Remove venturi on opposite side of bearing.
8. Lift out wheel.
9. Reverse above procedure to reinstall fan.
10. Check and adjust belt tension as necessary.
COMPRESSORS — Each compressor is charged with the
correct amount of oil at the factory. The correct oil charge is
shown in Table 1. If oil is visible in the compressor sight
glass, check unit for operating readiness as described in Start-Up
section, then start the unit. Observe oil level and add oil, if
required, to bring oil level in compressor crankcase up to
1
1
between ⁄4 and ⁄3 of sight glass during steady operation.
If oil charge is above 1⁄3 sight glass, do not remove any oil
until the compressor crankcase heater has been energized for
at least 24 hours with compressor off.
When additional oil or a complete charge is required, use
only Carrier-approved compressor oil:
Petroleum Specialties, Inc. . . . . . . . . . . . . . . . . . Cryol 150
Texaco, Inc. . . . . . . . . . . . . . . . . . . . . . . . . . Capella WF-32
Witco Chemical Corp. . . . . . . . . . . . . . . . . . . . Suniso 3GS
IMPORTANT: Do not use reclaimed oil or oil that has
been exposed to the atmosphere. Refer to Carrier Stand-
ard Service Techniques Manual, Chapter 1, Refriger-
ants section, for procedures to add or remove oil.
FAN SHAFT BEARINGS — Lubricate the bearings at least
twice annually with suitable bearing grease. Do not over grease.
Typical lubricants are show below:
MANUFACTURER
LUBRICANT
Texaco
Mobil
Sunoco
Texaco
Regal AFB-2*
Mobilplex EP No. 1
Prestige 42
Fig. 38 — Evaporator-Fan Pulley Alignment
and Adjustment
Multifak 2
*Preferred lubricant because it contains rust and oxidation inhibitors.
43
3. Fully retract motor plate adjusting bolts.
4. Loosen the 2 rear (nearest the evaporator coil) motor
plate nuts.
5. Remove the 2 front motor plate nuts and carriage bolts.
6. Slide motor plate to the rear (toward the coil) and re-
move fan belt(s).
7. Slide motor plate to the front and hand tighten one of
the rear motor plate nuts (tight enough to prevent the
motor plate from sliding back but loose enough to allow
the plate to pivot upward).
8. Pivot the front of the motor plate upward enough to al-
low access to the motor mounting hex bolts and secure
in place by inserting a prop.
Belt Tension Adjustment — To adjust belt tension:
1. Remove power to unit.
2. Remove motor mount nuts and bolts.
3. Loosen fan motor nuts. See Fig. 39.
4. Turn motor jacking bolts to move motor mounting plate
left or right for proper belt tension. A slight bow should
be present in the belt on the slack side of the drive while
running under full load.
5. Tighten nuts.
6. Adjust bolts and nut on mounting plate to secure motor
in fixed position. Recheck belt tension after 24 hours of
operation. Adjust as necessary.
Condenser-Fan Adjustment
1. Shut off unit power supply.
2. Remove fan guard.
9. Remove the nuts from the motor mounting hex bolts and
remove motor.
10. Reverse above steps to install new motor.
3. Loosen fan hub setscrews.
4. Adjust fan height on shaft using a straightedge placed across
venturi and measure per Fig. 40.
Power Failure — Dampers have a spring return. In event
of power failure, dampers will return to fully closed position
until power is restored.
5. Tighten setscrews and replace fan guard.
6. Turn on unit power.
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 Rec-
lamation section for charging methods and procedures.
Evaporator-Fan Motor Replacement
1. Shut off unit power supply.
2. Remove upper outside panel and open hinged door to
gain access to motor.
Unit panels must be in place when unit is operating dur-
ing charging procedure.
NO CHARGE — Use standard evacuating techniques. After
evacuating system, weigh in the specified amount of refrig-
erant (refer to Table 1).
LOW CHARGE COOLING — Using appropriate cooling
charging chart (see Fig. 41 and 42), add or remove refrig-
erant until conditions of the appropriate chart are met. Note
that charging chart is different from those normally used. An
accurate pressure gage and temperature sensing device are
required. Measure liquid line pressure at the liquid line serv-
ice valve using pressure gage. Connect temperature sensing
device to liquid line near the liquid line service valve and
insulate it so that outdoor ambient temperature does not af-
fect reading. Indoor-air cfm must be within normal operat-
ing range of unit. Take outdoor ambient temperature and read
the suction pressure gage. Refer to appropriate chart to de-
termine correct suction temperature. If intersection point on
chart is above the curve, add refrigerant. If intersection point
on chart is below curve, carefully recover some of the charge.
Recheck suction pressure as charge is adjusted.
Filter Drier — Replace whenever refrigerant system is
exposed to atmosphere.
Thermostatic Expansion Valve (TXV) — Each cir-
cuit has one. It is nonadjustable and is factory set to main-
tain 10 to 13° F superheat leaving the evaporator coil. Con-
trols flow of liquid refrigerant to the evaporator coils.
Fig. 39 — Belt Tension Adjustment
Protective Devices
COMPRESSOR PROTECTION
Overcurrent — Each compressor has one manual reset, cali-
brated trip, magnetic circuit breaker. Do not bypass connec-
tions or increase the size of the circuit breaker to correct trouble.
Determine the cause and correct it before resetting the breaker.
Overtemperature — Each 06D type compressor (024-038 units
only) has an internal protector to protect it against exces-
sively high discharge gas temperatures.
Fig. 40 — Condenser-Fan Adjustment
44
Crankcase Heater — Each compressor has a crankcase heater
to prevent absorption of liquid refrigerant by oil in the crank-
case when the compressor is idle. Since power for the crank-
case heaters is drawn from the unit incoming power, main
unit power must be on for the heaters to be energized.
Relief Devices — All units have relief devices to pro-
tect against damage from excessive pressures (i.e., fire). These
devices are installed on the suction line, liquid line, and on
the compressor.
Control Circuit, 24-V — This control circuit is pro-
tected against overcurrent by a 3.2-amp circuit breaker (CB4).
Breaker can be reset. If it trips, determine cause of trouble
before resetting.
IMPORTANT: After a prolonged shutdown or serv-
ice job, energize the crankcase heaters for 24 hours
before starting the compressors.
Control Circuit, 115-V — This control circuit is pro-
tected against overcurrent by a 5.0-amp circuit breaker (CB3).
Breaker can be reset. If it trips, determine cause of trouble
before resetting.
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. If the evaporator-
fan motor is replaced with a different horsepower motor, re-
sizing of the circuit breaker is required. Contact Carrier Ap-
plication Engineering.
Compressor Lockout Logic — If any of the safe-
ties trip, the circuit will automatically reset (providing the
safety has reset) and restart the compressor in 15 minutes. If
any of the safeties trip 3 times within a 90-minute period,
then the circuit will be locked out and will require manual
resetting by turning off either the unit disconnect or the con-
trol circuit breaker, or opening the thermostat.
CONDENSER-FAN MOTOR PROTECTION — Each
condenser-fan motor is internally protected against
overtemperature.
Replacement Parts — A complete list of replacement
parts may be obtained from any Carrier distributor upon
request.
HIGH- AND LOW-PRESSURE SWITCHES — If either
switch trips, or if the compressor overtemperature switch ac-
tivates, that refrigerant circuit will be automatically locked
out. To reset, manually move the thermostat setting.
FREEZE PROTECTION THERMOSTAT (FPT) — An FPT
is located on the evaporator coil for each circuit. It detects
frost build-up and turns off the compressor, allowing the coil
to clear. Once the frost has melted, the compressor can be
reenergized.
Fig. 41 — Cooling Charging Chart,
Sizes 024-034
Fig. 42 — Cooling Charging Chart,
Sizes 038-048
45
TROUBLESHOOTING
Typical refrigerant circuiting diagrams are shown in Fig. 43-45.
LEGEND
FPS
HPS
LPS
—
—
—
Freeze Protection Switch
High-Pressure Switch
Low-Pressure Switch
Fig. 43 — Typical Refrigerant Circuiting
(50EJ,EK,EW,EY024-034)
46
LEGEND
FPS
HPS
LPS
—
—
—
Freeze Protection Switch
High-Pressure Switch
Low-Pressure Switch
Fig. 44 — Typical Refrigerant Circuiting
(50EJ,EK,EW,EY038,044)
47
LEGEND
FPS
HPS
LPS
—
—
—
Freeze Protection Switch
High-Pressure Switch
Low-Pressure Switch
Fig. 45 — Typical Refrigerant Circuiting
(50EJ,EW048)
48
to Table 20 below for a description of alarms. The yellow
LED blinks during transmission with the CCN (Carrier Com-
fort Network). The green LED blinks during transmission
with the expansion board.
Diagnostic LEDs (Light-Emitting Diodes) — There
are 3 LEDs (red, yellow, and green) on the lower right hand
side of the control board. The red light is used to check
unit operation and alarms. A constant pulse is normal unit
operation. A series of quick blinks indicates an alarm. Refer
Table 20 — Control Board LED Alarms
LED
BLINKS
ERROR
CODE
TROUBLESHOOTING
COMMENTS
DESCRIPTION
1
2
Normal Operation
The expansion board and control board flash the red LED in one-
second intervals when the board is operating properly.
HF-13
HF-14
HF-15
Compressor 1 Safety
Compressor 2 Safety
Thermostat Failure
The high or low pressure safety switch for compressor no. 1 has
opened for 3 seconds. The error will be cleared and compressor
no. 1 will be allowed to turn on in 15 minutes. If the safeties have
been tripped 3 times in 90 minutes, compressor no. 1 will be
locked out until the control board has been manually reset.
3
4
The high or low pressure safety switch for compressor no. 2 has
opened for 3 seconds. The error will be cleared and compressor
no. 2 will be allowed to turn on in 15 minutes. If the safeties have
been tripped 3 times in 90 minutes, compressor no. 2 will be
locked out until the control board has been manually reset.
The thermostat is calling for both heating and cooling at the
same time. The unit will operate on a first call basis and will auto-
matically reset.
5
6
7
8
HF-05
HF-06
HF-03
HF-12
SAT Thermistor Failure
OAT Thermistor Failure
Space Temp. Sen. Failure
RAT Thermistor Failure
The supply-air temperature (SAT) sensor has failed. First check for
wiring errors, then replace sensor.
The outside-air temperature (OAT) sensor has failed. First check
for wiring errors, then replace sensor.
The space temperature sensor has failed. First check for wiring
errors, then replace sensor.
The return-air temperature (RAT) sensor has failed. Ensure that
the unit is a VAV unit. If NOT a VAV unit set DIP switch position 1
to the closed position and reset power. Then check for wiring
errors. Finally, replace sensor.
9
SE-05
Loss of Communications
with Expansion board
Communications between the expansion board and the control
board have been interrupted. Ensure that an expansion board
is installed and wired using the wire harness supplied with the
expansion module. If an expansion board is not used ensure that
DIP switch position 3 is in the closed position, and reset power.
10
11
HF-16
HF-17
Control Board Failure
Generated when hardware has failed on control board. Replace
the control board.
Expansion Board Failure
Generated when hardware has failed on the expansion board.
Replace the expansion board.
LEGEND
DIP
LED
VAV
—
—
—
Dual In-Line Package
Light-Emitting Diode
Variable Air Volume
49
Tables 21-23 show the input and output channel designations.
Table 21 — I/O Channel Designations
Table 22 — I/O Channel Designations
Base Module — VAV
Base Module — CV
TERMINAL
NO.
TERMINAL
NO.
ASSIGNMENT
ASSIGNMENT
T1-2
SPT (CCN) — 10K⍀ Thermistor
STO (CCN) — 10K⍀ Thermistor
OAT — 5K⍀ Thermistor
SAT — 5K⍀ Thermistor
—
T1-2
SPT (CCN) — 10K⍀ Thermistor
RAT — 5K⍀ Thermistor
OAT — 5K⍀ Thermistor
SAT — 5K⍀ Thermistor
—
T3-4
T3-4
T5-6
T5-6
T7-8
T7-8
T9-10
T9-10
T11-12
T13-14
T15-16
T17-25
T18-25
T19-25
T20-25
T21-25
T22-25
T23-25
T24-25
T26-27
T28-29
T30-29
T31-32
T33-32
T34-35
T36-35
T37-38
T39-38
K1
T11-12
T13-14
T15-16
T17-25
T18-25
T19-25
T20-25
T21-25
T22-25
T23-25
T24-25
T26-27
T28-29
T30-29
SAT Reset — AI (2-10 vdc)
—
SAT Reset — AI (2-10 vdc)
—
—
—
Y1 or Remote Start/Stop — DI (24 vac)
Y2 — DI (24 vac)
Remote Start/Stop — DI (24 vac)
—
W1 — DI (24 vac)
—
W2 — DI (24 vac)
—
G — DI (24 vac)
—
Compressor 1 Safety — DI (24 vac)
Compressor 2 Safety — DI (24 vac)
Outside Air Enthalpy — DI (24 vac)
Economizer Pos. — AO (4-20 mA)
Heat 1 Relay — DO (24 vac)
Heat 2 Relay — DO (24 vac)
Compressor 1 Safety — DI (24 vac)
Compressor 2 Safety — DI (24 vac)
Outside Air Enthalpy — DI (24 vac)
Economizer Pos. — AO (4-20 mA)
Heat 1 Relay — DO (115 vac)
Heat Interlock Relay — DO (115 vac)
Modulated Power Exhaust — DO (115 vac)
—
CV Power Exhaust 1/Modulating Pwr Exht — DO
(115 vac)
T31-32
T33-32
T34-35
T36-35
T37-38
T39-38
K1
CV Power Exhaust 2 — DO (115 vac)
Condenser Fan — DO (115 vac)
OFC2 — DO (115 vac)
—
Condenser Fan — DO (115 vac)
OFC2 — DO (115 vac)
Unloader 1 — DO (115 vac)
Unloader 2 — DO (115 vac)
Indoor Fan Relay — DO (HV)
Compr. 1 — DO (HV)
Compr. 2 — DO (HV)
—
Indoor Fan Relay — DO (HV)
Compr. 1 — DO (HV)
Compr. 2 — DO (HV)
K2
K2
K3
K3
LEGEND
(Tables 21 and 22)
AI
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Analog Input
AO
CCN
CV
Analog Output
Carrier Comfort Network
Constant Volume
Direct Input
DI
DO
HV
Direct Output
High Voltage
K⍀
OAT
OFC
RAT
SAT
SPT
STO
T
Kilo-Ohms
Outdoor-Air Temperature
Outdoor Fan Contactor
Return-Air Temperature
Supply-Air Temperature
Space Temperature
Space Temperature Offset
Terminal
VAV
Variable Air Volume
50
Table 23 — I/O Channel Designations Expansion
Module — CV and VAV
TERMINAL
ASSIGNMENT
NO.
T1-2
—
T3-4
—
T5-6
—
T7-8
—
T9-10
T11-12
T13-14
T15-16
T17-25
T18-25
T19-25
T20-25
T21-25
T22-25
T23-25
T24-25
T26-27
T28-29
T30-29
T31-32
T33-32
T34-35
T36-35
T37-38
T39-38
K1
—
IAQ Indoor — AI (2-10 vdc)
IAQ Outdoor — AI (2-10 vdc)
—
Fan Status — DI (24 vac)
Filter Status — DI (24 vac)
Field Applied Status — DI (24 vac)
Demand Limit — DI (24 vac)
Fire — Unit Shutdown — DI (24 vac)
Fire — Pressurization — DI (24 vac)
Fire — Evacuation — DI (24 vac)
Fire — Smoke Purge — DI (24 vac)
—
—
Alarm Light Indicator — DO (24 vac)
Power Exhaust Fire #1 — DO (115 vac)
Power Exhaust Fire #2 — DO (115 vac)
Power Exhaust Fire #3 — DO (115 vac)
Power Exhaust Fire #4 — DO (115 vac)
—
—
—
—
—
K2
K3
LEGEND
AI
—
—
—
—
—
Analog Input
Direct Input
Direct Output
Indoor Air Quality
Terminal
DI
DO
IAQ
T
51
PACKAGED SERVICE TRAINING
Our packaged service training programs provide an excellent way to increase your knowledge of the
equipment discussed in this manual. Product programs cover:
• Unit Familiarization
• Installation Overview
• Maintenance
• Operating Sequence
A large selection of product, theory, and skills programs is available. All programs include a video
cassette and/or slides and a companion booklet. Use these for self teaching or to conduct full training
sessions.
For a free Service Training Material Catalog (STM), call 1-800-962-9212. Ordering instructions are
included.
Copyright 1996 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
PC 111
Catalog No. 535-006
Printed in U.S.A.
Form 50E-3SI
Pg 54
8-96
Replaces: 50E-1SI
Tab 1b
START-UP CHECKLIST
MODEL NO.:
SERIAL NO.:
TECHNICIAN:
SOFTWARE VERSION (SEE FIG. 15)
DATE:
PRE-START-UP:
Ⅺ VERIFY THAT DIP SWITCH SETTINGS ARE CORRECT
Ⅺ VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT
Ⅺ REMOVE ALL SHIPPING HOLDDOWN BOLTS AND BRACKETS PER INSTRUCTIONS
Ⅺ VERIFY INSTALLATION OF ECONOMIZER HOOD
Ⅺ VERIFY INSTALLATION OF ALL OPTIONS AND ACCESSORIES
Ⅺ VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS
Ⅺ VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT
Ⅺ CHECK THAT INDOOR-AIR FILTER IS CLEAN AND IN PLACE
Ⅺ VERIFY THAT UNIT IS LEVEL WITHIN TOLERANCES
Ⅺ CHECK FAN WHEELS AND PROPELLERS FOR LOCATION IN HOUSING/ORIFICE, AND VERIFY SET SCREW
IS TIGHT
Ⅺ VERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED
Ⅺ VERIFY THAT SUCTION, DISCHARGE, AND LIQUID LINE SERVICE VALVES ON EACH CIRCUIT ARE OPEN
START-UP
ELECTRICAL
SUPPLY VOLTAGE L1-L2
L2-L3
L3-L1
COMPRESSOR AMPS — COMPRESSOR NO. 1
— COMPRESSOR NO. 2
L1
L1
L2
L2
L3
L3
SUPPLY FAN AMPS (CV)
(VAV)
EXHAUST FAN AMPS
*
*VAV fan supply amps reading must be taken with a true RMS meter for accurate readings.
ELECTRIC HEAT AMPS (IF SO EQUIPPED) L1
L2
L3
TEMPERATURES
OUTDOOR-AIR TEMPERATURE
RETURN-AIR TEMPERATURE
COOLING SUPPLY AIR
F
DB (Dry-Bulb)
DB
F
F
F
WB (Wet-Bulb)
ELECTRIC HEAT SUPPLY AIR (IF SO EQUIPPED)
F
PRESSURES
REFRIGERANT SUCTION
CIRCUIT NO. 1
PSIG
PSIG
CIRCUIT NO. 2
CIRCUIT NO. 2
PSIG
PSIG
REFRIGERANT DISCHARGE CIRCUIT NO. 1
Ⅺ VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS ON PAGE 45
CL-1
START-UP CHECKLIST (cont)
GENERAL
Ⅺ ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS
Ⅺ ENSURE DRIVES OPERATE WITHIN LIMITS OF FAN PERFORMANCE TABLES
HIGH-PRESSURE SWITCH SETTING
LOW-PRESSURE SWITCH SETTING
MOTOR PULLEY PART NUMBER
FAN PULLEY PART NUMBER
BELT PART NUMBER
PSIG
PSIG
BELT SIZE
in.
in.
FILTER QUANTITY
FILTER SIZES
ADDITIONAL NOTES:
Copyright 1996 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
PC 111
Catalog No. 535-006
Printed in U.S.A.
Form 50E-3SI
Pg CL-2
8-96
Replaces: 50E-1SI
Tab 1b
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