Carrier 50Ej Users Manual

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Installation, Start-Up and

Service Instructions

CONTENTS Page

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

Step5—TrapCondensate 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

Step 8 — Make Outdoor-Air Inlet

Adjustments ...............................25

• ECONOMIZER

• 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

SAFETY CONSIDERATIONS

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.

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.

Before performing service or maintenance operations on

unit, turn off main power switch to unit. Electrical shock

could cause personal injury.

IMPORTANT — READ BEFORE INSTALLING

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.

INSTALLATION

Step 1 — Provide Unit Support

All panels must be in place when rigging. Unit is not

designed for handling by fork truck.

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.

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.

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.

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:

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.

50EJ,EK,EW,EY024-048

Single-Package Rooftop Units

Electric Cooling with Electric Heat Option

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 1

Tab 1b

PC 111 Catalog No. 535-006 Printed in U.S.A. Form 50E-3SI Pg 1 8-96 Replaces: 50E-1SI

NOTES:

1. Unless otherwise specified, all dimensions are to out-

side of part.

2. Roof curb accessory is shipped disassembled.

3. All roof curb parts are to be 16 ga galvanized steel.

4. Dimensions are in inches.

Fig. 1 — Roof Curb (Sizes 024-034)

UNIT LEVELING TOLERANCES DIMENSIONS*

(Degrees and Inches)

AB

Deg. in. Deg. in.

1.0 2.9 .50 .75

*From edge of unit to horizontal.

NOTE: To prevent standing water in the drain pan of the indoor section

and the heat exchangers, UNIT CAN ONLY BE PITCHED AS SHOWN.

2

NOTES:

1. Unless otherwise specified, all dimensions are to out-

side of part.

2. Roof curb accessory is shipped disassembled.

3. All roof curb parts are to be 16 ga galvanized steel.

4. Dimensions are in inches.

Fig. 2 — Roof Curb (Sizes 038-048)

NOTE: To prevent standing water in the drain pan of the indoor section and the

heat exchangers, UNIT CAN ONLY BE PITCHED AS SHOWN.

UNIT LEVELING TOLERANCES DIMENSIONS*

(Degrees and Inches)

AB

Deg. in. Deg. in.

1.0 2.9 .50 .75

*From edge of unit to horizontal.

3

NOTES:

1. Weights include economizer (Std)

2. Center of gravity.

3. Do not locate adjacent units with dis-

charge facing economizer inlet. Mini-

mum clearances to be:

Adjacent Units: 158-09

Top of Units: No overhang

Condenser Coil: 48-09

Economizer Side: 68-09

Filter Access Side: 108-09(for re-

moval 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. Dimen-

sions 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.

LEGEND

VFD — Variable Frequency Drive

UNIT SIZE

50EJ/EK

OPERATING

WEIGHT

(lb)

AB CORNER WEIGHT

(lb)

ft-in. ft-in. 1 2 3 4

024 4016 5-11

3

⁄

8

3-5

11

⁄

16

823 914 1199 1080

028 4102 5- 8

1

⁄

2

3-7

5

⁄

8

844 859 1210 1189

030 4102 5- 8

1

⁄

2

3-7

5

⁄

8

844 859 1210 1189

034 4102 5- 8

1

⁄

2

3-7

5

⁄

8

844 859 1210 1189

Fig. 3 — Base Unit Dimensions, 50EJ/EK024-034

4

NOTES:

1. Weights include economizer (Std)

2. Center of gravity.

3. Do not locate adjacent units with discharge facing economizer inlet. Mini-

mum clearances to be:

Adjacent Units: 158-09

Top of Units: No overhang

Condenser Coil: 48-09

Economizer Side: 68-09

Filter Access Side: 108-09(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.

UNIT SIZE

50E

OPERATING

WEIGHT

(lb)

ABCORNER WEIGHT

(lb)

ft-in. ft-in. 1 2 3 4

J038 4282 7-7

5

⁄

16

3-10

1

⁄

2

961 858 1162 1302

J/K044 4508 7-3

13

⁄

16

3-11

1

⁄

2

973 868 1258 1409

J048 4795 7-2

3

⁄

16

3-10

3

⁄

32

1007 915 1368 1505

Fig. 4 — Base Unit Dimensions, 50EJ038-048 and 50EK044

LEGEND

VFD — Variable Frequency Drive

5

NOTES:

1. Weights include economizer (Std)

2. Center of gravity.

3. Do not locate adjacent units with discharge facing econo-

mizer inlet. Minimum clearances to be:

Adjacent Units: 158-09

Top of Units: No overhang

Condenser Coil: 48-09

Economizer Side: 68-09

Filter Access Side: 108-09(for removal of evaporator

coil)

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.

7. For side-supply/return applications, a single return and

supply ductwork connection is recommended for cov-

ering both return and both supply openings.

UNIT SIZE

50EW/EY

OPERATING

WEIGHT

(lb)

ABCORNER WEIGHT

(lb)

ft-in. ft-in. 1 2 3 4

024 4016 5-11

3

⁄

8

3-5

11

⁄

16

823 914 1199 1080

028 4102 5- 8

1

⁄

2

3-7

5

⁄

8

844 859 1210 1189

030 4102 5- 8

1

⁄

2

3-7

5

⁄

8

844 859 1210 1189

034 4102 5- 8

1

⁄

2

3-7

5

⁄

8

844 859 1210 1189

Fig. 5 — Base Unit Dimensions, 50EW/EY024-034

LEGEND

VFD — Variable Frequency Drive

6

NOTES:

1. Weights include economizer (Std)

2. Center of gravity.

3. Do not locate adjacent units with discharge facing economizer inlet.

Minimum clearances to be:

Adjacent Units: 158-09

Top of Units: No overhang

Condenser Coil: 48-09

Economizer Side: 68-09

Filter Access Side: 108-09(for removal of evaporator coil)

4. For smaller service and operational clearances, contact 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 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.

UNIT SIZE

50E

OPERATING

WEIGHT

(lb)

AB

CORNER WEIGHT

(lb)

ft-in. ft-in. 1 2 3 4

W038 4282 7-7

5

⁄

16

3-10

1

⁄

2

961 858 1162 1302

W/Y044 4508 7-3

13

⁄

16

3-11

1

⁄

2

973 868 1258 1409

W048 4795 7-2

3

⁄

16

3-10

3

⁄

32

1007 915 1368 1505

Fig. 6 — Base Unit Dimensions, 50EW038-048 and 50EY044

LEGEND

VFD — Variable Frequency Drive

7

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.

Four lifting lugs are provided on the unit base rails as shown

in Fig. 7. Refer to rigging instructions on 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).

MODEL

50EJ/EK/EW/EY WEIGHT A B C

lb kg in. mm in. mm in. mm

024 4016 1822 87.68 2227 71.4 1814 41.7 1059

028

4102 1860 87.68 2227 68.5 1740 43.6 1107030

034

038* 4282 1942

150 3810

91.3 2319 46.5 1181

044 4508 2045 87.8 2230 46.5 1181

048* 4795 2175 86.2 2189 46.1 1171

*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 4102 4102 4102

Al/Cu† 4236 4322 4322 4322

Roof Curb (14-in. curb) 365 365 365 365

COMPRESSOR

Type Ckt 1 06D328 06D328 06D537 06D537

Ckt 2 06D818 06D328 06D328 06D537

Number of Refrigerant Circuits 22 2 2

Oil (oz) (Ckt1, Ckt 2) 115, 88 115 ea. 115 ea. 115 ea.

REFRIGERANT TYPE R-22

Operating Charge (lb-oz)

Circuit 1** 25-0 25-0 25-0 25-0

Circuit 2 31-0 25-0 25-0 25-0

CONDENSER COIL Cross-Hatched

3

⁄

8

9Copper Tubes, Aluminum Lanced or Copper Fins

Quantity 11 1 1

Rows...Fins/in. 4...15 4...15 4...15 4...15

Total Face Area (sq ft) 33.3 33.3 33.3 33.3

CONDENSER FAN Propeller Type

Nominal Cfm 13,420 13,420 13,420 13,420

Quantity...Diameter (in.) 2...30 2...30 2...30 2...30

Motor Hp (1075 Rpm) 11 1 1

EVAPORATOR COIL Cross-Hatched

3

⁄

8

9Copper Tubes, Aluminum or Copper Plate Fins, Intertwined Circuits

Rows...Fins/in. 4...15 4...15 4...15 4...15

Total Face Area (sq ft) 31.7 31.7 31.7 31.7

EVAPORATOR FAN Centrifugal Type

Quantity...Size (in.) 2...20x15 2...20x15 2...20x15 2..20x15

Type Drive Belt Belt Belt Belt

Nominal Cfm 8,000 10,000 11,000 12,000

Motor Hp 5 10†† 15 7.5 10†† 15 10 15†† 20 10 15†† 20

Motor Frame Size S184T S215T S254T S213T S215T S254T S215T S254T S256T S215T S254T S256T

Motor Bearing Type Ball Ball Ball Ball

Maximum Allowable Rpm 1200 1200 1200 1200

Motor Pulley Pitch Diameter 4.6 6.6 6.9 4.9 6.1 7.1 6.6 6.7 7.5 6.4 6.9 7.5

Nominal Motor Shaft Diameter (in.) 1

1

⁄

8

1

3

⁄

8

1

5

⁄

8

1

3

⁄

8

1

3

⁄

8

1

5

⁄

8

1

3

⁄

8

1

5

⁄

8

1

5

⁄

8

1

3

⁄

8

1

5

⁄

8

1

5

⁄

8

Fan Pulley Pitch Diameter (in.) 11.1 12.5 11.1 11.1 11.1 11.1 13.7 11.1 11.1 12.5 11.1 11.1

Nominal Fan Shaft Diameter (in.) 1

11

⁄

16

1

11

⁄

16

1

11

⁄

16

1

11

⁄

16

Belt, Quantity...Type 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.) 62 63 59 59 59 59 65 59 60 63 59 60

Pulley Center Line Distance (in.) 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 15.6-18.4 15.0-17.9

Factory Speed Setting (rpm) 725 924 1088 773 962 1119 843 1056 1182 896 1088 1182

HIGH-PRESSURE SWITCH (psig)

Cutout 426 426 426 426

Reset (Auto.) 320 320 320 320

LOW-PRESSURE SWITCH (psig)

Cutout 77 7 7

Reset (Auto.) 22 22 22 22

RETURN-AIR FILTERS

Quantity...Size (in.) 10...20x24x2 10...20x24x2 10...20x24x2 10...20x24x2

OUTDOOR-AIR FILTERS 8...16x25 8...16x25 8...16x25 8...16x25

Quantity...Size (in.) 4...20x25 4...20x25 4...20x25 4...20x25

POWER EXHAUST Direct Drive, 3-Speed, Single-Phase Motor (Factory-Wired For High Speed) and Forward Curved Fan

Motor, Quantity...Hp 4...1

Fan, Diameter...Width (in.) 11...10

LEGEND

Al — Aluminum

Cu — 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.

NOTES:

1. See Table 2 for evaporator fan motor data.

2. Sizes 038 and 048 are 50EJ,EW units only.

VFD

(Hp) VFD WEIGHTS (lb)

208/230 v 460 v 575 v

520 22 60

7.5 51 37 64

10 51 61 64

15 61 63 109

20 63 111 109

25 105 112 174

30 172 118 180

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 4508 4795

Al/Cu† 4567 4793 5175

Roof Curb (14-in. curb) 410 410 410

COMPRESSOR

Type Ckt 1 06D537 06EA250 06EA265

Ckt 2 06D537 06EA250 06EA250

Number of Refrigerant Circuits 22 2

Oil (oz) (Ckt1, Ckt 2) 115 ea. 224 ea. 304, 224

REFRIGERANT TYPE R-22

Operating Charge (lb-oz)

Circuit 1** 34-0 35-0 41-0

Circuit 2 34-0 35-0 41-0

CONDENSER COIL Cross-Hatched

3

⁄

8

9Copper Tubes, Aluminum Lanced or Copper Fins

Quantity 2211

Rows...Fins/in. 3...15 3...15 4...15 3...15

Total Face Area (sq ft) 58.3 58.3 66.7

CONDENSER FAN Propeller Type

Nominal Cfm 27,064 27,064 27,064

Quantity...Diameter (in.) 4...30 4...30 4...30

Motor Hp (1075 Rpm) 11 1

EVAPORATOR COIL Cross-Hatched

3

⁄

8

9Copper Tubes, Aluminum or Copper Plate Fins, Intertwined Circuits

Rows...Fins/in. 3...15 3...15 4...15

Total Face Area (sq ft) 34.7 34.7 34.7

EVAPORATOR FAN Centrifugal Type

Quantity...Size (in.) 2..20x15 2...20x15 2...20x15

Type Drive Belt Belt Belt

Nominal Cfm 14,000 16,000 18,000

Motor Hp 10 15†† 20 15 20†† 25 20 25†† 30

Motor Frame Size S215T S254T S256T S254T S256T S284T S256T S284T S286T

Motor Bearing Type Ball Ball Ball

Maximum Allowable Rpm 1200 1200 1200

Motor Pulley Pitch Diameter 4.1 6.9 7.5 6.9 8.1 9.1 5.3 5.9 7.5

Nominal Motor Shaft Diameter (in.) 1

3

⁄

8

1

5

⁄

8

1

5

⁄

8

1

5

⁄

8

1

5

⁄

8

1

1

⁄

8

1

5

⁄

8

1

7

⁄

8

1

7

⁄

8

Fan Pulley Pitch Diameter (in.) 9.1 12.5 12.5 12.5 13.7 13.7 9.1 9.1 11.1

Nominal Fan Shaft Diameter (in.) 1

11

⁄

16

1

11

⁄

16

1

11

⁄

16

Belt, Quantity...Type 1...BX51 1...5VX630 1...5VX650 1...5VX630 1...5VX670 2...5VX680 1...5VX550 2...5VX560 2...5VX610

Belt, Length (in.) 54 63 65 63 67 68 55 56 59

Pulley Center Line Distance (in.) 15.6-18.4 15.0-17.9 15.0-17.9 14.6-17.6 15.0-17.9 14.6-17.6 14.6-17.6

Factory Speed Setting (rpm) 788 966 1050 1066 1035 1162 1019 1135 1182

HIGH-PRESSURE SWITCH (psig)

Cutout 426 426 426

Reset (Auto.) 320 320 320

LOW-PRESSURE SWITCH (psig)

Cutout 77 7

Reset (Auto.) 22 22 22

RETURN-AIR FILTERS

Quantity...Size (in.) 10...20x24x2 10...20x24x2 10..20x24x2

OUTDOOR-AIR FILTERS 8...16x25 8...16x25 8...16x25

Quantity...Size (in.) 4...20x25 4...20x25 4...20x25

POWER EXHAUST Direct Drive, 3-Speed, Single-Phase Motor (Factory-Wired For High Speed) and Forward Curved Fan

Motor, Quantity...Hp 4...1

Fan, Diameter...Width (in.) 11...10

LEGEND

Al — Aluminum

Cu — 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.

NOTES:

1. See Table 2 for optional evaporator fan motor data.

2. Sizes 038 and 048 are 50EJ,EW units only.

VFD

(Hp) VFD WEIGHTS (lb)

208/230 v 460 v 575 v

520 22 60

7.5 51 37 64

10 51 61 64

15 61 63 109

20 63 111 109

25 105 112 174

30 172 118 180

10

Table 2 — Evaporator Fan Motor Data

UNIT

SIZE MOTOR

HP

MOTOR

SHAFT

DIAMETER

(in.)

FAN

SHAFT

SPEED

(rpm)

MOTOR

SHEAVE

MOTOR

SHEAVE

PITCH

DIAMETER

(in.)

BUSHING

DIAMETER

(in.)

FAN

SHEAVE

FAN

SHEAVE

PITCH

DIAMETER

(in.)

BUSHING

DIAMETER

(in.) BELT OUTSIDE

BELT

LENGTH

BELT

TENSION

(Lb @

.24 in.)

024 5 1.12 725 BK52 4.6 None-1.125 1B5V110 11.1 B-1.6875 BX59 62 5.02

10 1.38 924 BK72 6.6 None-1.375 1B5V124 12.5 B-1.6875 BX60 63 7.05

15 1.62 1088 1B5V68 6.9 B-1.625 1B5V110 11.1 B-1.6875 5VX590 59 9.38

028 7.5 1.38 773 BK55H 4.9 H-1.375 1B5V110 11.1 B-1.6875 BX56 59 6.87

10 1.38 962 BK67H 6.1 H-1.375 1B5V110 11.1 B-1.6875 BX56 59 7.26

15 1.62 1119 1B5V70 7.1 B-1.625 1B5V110 11.1 B-1.6875 5VX590 59 9.17

030 10 1.38 843 BK72 6.6 None-1.375 1B5V136 13.7 B-1.6875 BX62 65 6.96

15 1.62 1056 1B5V66 6.7 B-1.625 1B5V110 11.1 B-1.6875 5VX590 59 9.60

20 1.62 1182 1B5V74 7.5 B-1.625 1B5V110 11.1 B-1.6875 5VX600 60 11.67

034 10 1.38 896 BK70H 6.4 H-1.375 1B5V124 12.5 B-1.6875 BX60 63 7.20

15 1.62 1088 1B5V68 6.9 B-1.625 1B5V110 11.1 B-1.6875 5VX590 59 9.38

20 1.62 1182 1B5V74 7.5 B-1.625 1B5V110 11.1 B-1.6875 5VX600 60 11.17

038 10 1.38 788 2BK47 4.1 None-1.375 2B5V90 9.1 B-1.6875 BX51 54 5.49

15 1.62 966 1B5V68 6.9 B-1.625 1B5V124 12.5 B-1.6875 5VX630 63 9.22

20 1.62 1050 1B5V74 7.5 B-1.625 1B5V124 12.5 B-1.6875 5VX650 65 10.02

044 15 1.62 966 1B5V68 6.9 B-1.625 1B5V124 12.5 B-1.6875 5VX630 63 9.54

20 1.62 1035 1B5V80 8.1 B-1.625 1B5V136 13.7 B-1.6875 5VX670 67 10.37

25 1.88 1162 1B5V90 9.1 B-1.875 1B5V136 13.7 B-1.6875 5VX680 68 10.88

048 20 1.62 1019 2B5V52 5.3 B-1.625 2B5V90 9.1 B-1.6875 5VX550 55 7.93

25 1.88 1135 2B5V58 5.9 B-1.875 2B5V90 9.1 B-1.6875 5VX560 56 8.66

30 1.88 1182 2B5V76 7.5 B-1.875 2B5V110 11.1 B-1.6875 5VX610 59 9.07

NOTE: Motor shaft speed is 1750 rpm. The fan shaft diameter is 1

11

⁄

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.

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.

Step5—TrapCondensate 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

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.

Fig. 8 — Air Distribution — Thru-the-Bottom

Fig. 9 — Air Distribution — Thru-the-Side

11

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: 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.

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

• 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 Guardt(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)

• ability to change power exhaust set points

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.

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

Table 3 — Controls Options and Configurations (Non-Thermostat Applications)

UNIT CONFIGURATION DEFAULT COOLING DEFAULT HEATING

UNITS RUNNING VERSION 1.0 UNIT CONTROL SOFTWARE

CV or VAV Unit with SPT Sensor Unoccupied Cooling — 90 F (SPT)

Occupied Cooling — NA Unoccupied Heating — 55 F (SPT)

Occupied Heating — NA

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)

VAV Unit Remote Start/Switch Only Unoccupied Cooling — NA

Occupied Cooling — 55 F (SAT) Unoccupied Heating — NA

Occupied Heating — NA

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

CV or VAV Unit with SPT Sensor Unoccupied Cooling — 90 F (SPT)

Occupied Cooling — NA Unoccupied Heating — 55 F (SPT)

Occupied Heating — NA

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)

VAV Unit Remote Start/Stop Switch Only Unoccupied Cooling — 90 F (RAT)

Occupied Cooling — 55 F (SAT) Unoccupied Heating — 55 F (RAT)

Occupied Heating — 68 F (RAT)*

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

CV — Constant Volume SAT — Supply-Air Temperature

NA — Not Available SPT — Space Temperature

RAT — Return-Air Temperature VAV — Variable Air Volume

*With DIP Switch No. 5 configured to OPEN (Occupied Heat Enabled).

NOTE: Space temperature sensor and remote stop/switch are field-supplied.

Fig. 10 — Condensate Drain Connections

(Typical Roof Curb or Slab Mount Shown)

12

Features with sensor control of unit with computer access

are:

• 365 day timeclock with backup (supports minute, hour,

day of week, date, month, and year)

• daylight savings time function

• 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

• 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 VVTt(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

or during unexpected power outages. For complete Carrier

Comfort System (CCS) or Carrier Comfort Network (CCN)

features and benefits, refer to the product literature.

VARIABLE AIR VOLUME (VAV) APPLICATIONS

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.

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.

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

Fig. 12 — Control Board Diagram

LEGEND

CCN — Carrier Comfort Network R—Relay

COM — Common SIO — Serial Input/Output

D—Diode SW — Switch

N.C. — Normally Closed T—Terminal

N.O. — Normally Open

*Where X is the unit control software version (1 or 2).

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)

• 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

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

• 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:

• 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.

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

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.

Step 7 — Make Electrical Connections

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.

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).

LEGEND

EQUIP — Equipment

GND — Ground

NEC — National Electrical Code

TB — Terminal Block

NOTE: Maximum wire size for TB1 is 500 MCM.

Fig. 13 — Field Power Wiring Connections

15

A3

1

⁄

2

-in. NPT coupling for field power wiring and a

3

⁄

4

-in. NPT coupling for 24-v control wiring are provided in

basepan. In the side post, there are two 2

1

⁄

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

side of unit, a

7

⁄

8

-in. diameter hole is provided in the con-

denser side post next to the control box.

If disconnect box is mounted to corner post, be careful

not to drill any screws into the condenser coil.

Routing Through Bottom of Unit — If wiring is brought in

through bottom of unit, use field-supplied watertight conduit

to run power wiring from basepan out through bottom

3

1

⁄

2

-in. hole to the disconnect box and back into unit to the

main control box.

Use strain relief going into control box through 2

1

⁄

2

-in.

diameter hole provided. After wires are in unit control box,

connect to power terminal block (see Power Wiring section

on this page 15).

Low-voltage wiring must be run in watertight conduit from

the basepan to control box and through

7

⁄

8

-in. diameter hole

provided in bottom of unit control box. Field-supplied strain

relief must be used going into the box. After wiring is in

control box, make connections to proper terminals on ter-

minal blocks (see Field Control Wiring section on this page).

Install conduit connector in unit basepan or side panel open-

ings provided. Route power and ground lines through con-

nector to connections in unit control box as shown on unit

wiring diagram and Fig. 13.

Routing Through Side of Unit — Route power wiring in

field-supplied watertight conduit into unit through 2

1

⁄

2

-or

3-in. hole. Strain relief (field supplied) must be used in hole.

See Fig. 13.

Use field-supplied strain relief going into control box through

2

1

⁄

2

- or 3-in. diameter hole provided. After wires are in unit

control box, connect to power terminal block (see Power Wir-

ing section on page 15).

Bring low-voltage control wiring through factory-drilled

7

⁄

8

-in. diameter hole in condenser side post. Use strain relief

going into

7

⁄

8

-in. diameter hole in bottom of unit control box.

After wiring is in control box, make connection to proper

terminals on terminal blocks (see Field Control Wiring sec-

tion on this page).

IMPORTANT: THE VAV (variable air volume) units

incorporate VFD (variable frequency drives) which gen-

erate, use, and can radiate radio frequency energy. If

units are not installed and used in accordance with these

instructions, they may cause radio interference. They

have been tested and found to comply with limits of a

Class A computing device as defined by FCC (Federal

Communications Commission) regulations, Subpart J

of Part 15, which are designed to provide reasonable

protection against such interference when operated in

a commercial environment.

The unit must be electrically grounded in accordance

with local codes and NEC ANSI/NFPA 70 (National Fire

Protection Association).

Operating voltage to compressor must be within voltage

range indicated on unit nameplate. On 3-phase units, volt-

ages between phases must be balanced within 2% and the

current must be balanced within 10%.

Use the formula in Table 4 to determine the percentage of

voltage imbalance.

IMPORTANT: If the supply voltage phase imbalance

is more than 2%, contact your local electric utility com-

pany immediately.

Unit failure as a result of operation on improper line volt-

age or excessive phase imbalance constitutes abuse and may

cause damage to electrical components.

On 208/230-v units, transformer no. 1 is wired for 230-v.

If 208/230-v unit is to be run with 208-v power supply, the

transformer must be rewired as follows:

1. Remove cap from red (208-v) wire.

2. Remove cap from spliced orange (230-v) wire. Discon-

nect orange wire from black unit power wire.

3. Cap orange wire.

4. Splice red wire and black unit power wire. Cap wires.

IMPORTANT: Be certain unused wires are capped.

Failure to do so may damage the transformers.

FIELD CONTROL WIRING — Install either a Carrier-

approved accessory thermostat or a CCN (Carrier Comfort

Network) compatible temperature sensor. Thermostats are used

on CV (constant volume) units only. Control box diagrams

are shown in Fig. 14 and 15.

Thermostat Wiring (CV Only) — Install a Carrier-approved

accessory thermostat assembly (per current price pages) ac-

cording to the installation instructions included with the ac-

cessory or these instructions. Locate thermostat assembly on

a solid wall in the conditioned space to sense average

temperature.

Route thermostat cable or equivalent single leads of col-

ored wire from subbase terminals to low-voltage connec-

tions as shown on unit label wiring diagram and in Fig. 16.

NOTE: For wire runs up to 50 ft, use no. 18 AWG (Ameri-

can Wire Gage) insulated wire (35 C minimum). For 50 to

75 ft, use no. 16 AWG insulated wire (35 C minimum). For

over 75 ft, use no. 14 AWG insulated wire (35 C minimum).

All wire larger than no. 18 AWG cannot be directly con-

nected to the thermostat and will require a junction box and

splice at the thermostat.

Set heat anticipators settings to 0.1 for all voltages. Set-

tings may be changed slightly to provide a greater degree of

comfort for a particular installation.

Sensor Wiring (CV or VAV) — The temperature sensor is

wired into the unit control board. See Fig. 17.

The unit is controlled with a T55, T56 (CV only), or T57

zone sensor. Terminal TH on the sensor is connected to T1

of the base module board. Terminal COM on the sensor is

connected to T2 on the base module board. If a T56 set point

override sensor is used, the override connection SW on the

sensor is connected to T3 on the base module board.

VAV units using Version 1.0 of the unit control software

may operate without a space temperature sensor during oc-

cupied schedules, but unit will not provide unoccupied heat-

ing or cooling.

VAV Units — VAV units require a field-supplied heat inter-

lock relay (HIR) to drive the air terminal wide open when in

heat mode. The HIR part number is HN61KK041.

Remote Field Control (Units Running Version 1.0 of Unit

Control Software) — A switch closure across terminals R

and Y1 on TB-3 will initiate the Occupied mode. This can

be done manually as well as through a field-supplied

timeclock.

16

Table 4 — Electrical Data — 50EJ,EK,EW,EY024-048

UNIT

SIZE

NOMINAL

VOLTAGE

(3 Ph 60 Hz)

VOLTAGE

RANGE COMPRESSOR OFM IFM POWER

EXHAUST ELECTRIC

HEAT* POWER SUPPLY

No. 1 No. 2

Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP†

024

208/230 187 254 39.1 228 25.6 160 2 1 5.3

516.7/

15.2

— — — — 101.8/100.3 125/125

23.6 41.6 — — 125.4/123.9 150/150

— — 29/36 75.1/ 86.6 114.7/127.3 125/150

23.6 41.6 29/36 75.1/ 86.6 144.2/156.8 150/175

— — 59/72 150.1/173.2 171.0/192.2 200/225

23.6 41.6 59/72 150.1/173.2 200.5/221.7 225/225

10 30.8/

28.0

— — — — 115.9/113.1 150/150

23.6 41.6 — — 139.5/136.7 175/175

— — 29/36 75.1/ 86.6 132.3/143.3 150/150

23.6 41.6 29/36 75.1/ 86.6 161.8/172.8 175/175

— — 59/72 150.1/173.2 188.6/208.2 220/225

23.6 41.6 59/72 150.1/173.2 218.1/237.7 250/250

15 46.2/

42.0

— — — — 131.3/127.1 150/150

23.6 41.6 — — 154.9/150.7 175/175

— — 29/36 75.1/ 86.6 151.6/160.8 175/175

23.6 41.6 29/36 75.1/ 86.6 181.1/190.3 200/200

— — 59/72 150.1/173.2 207.9/225.7 250/250

23.6 41.6 59/72 150.1/173.2 237.4/255.2 275/275

460 414 508 19.9 114 11.5 80 2 1 2.7

5 7.6

— — — — 49.4 60

12.6 23.6 — — 62.0 80

— — 36 43.3 63.6 70

12.6 23.6 36 43.3 79.4 80

— — 72 86.6 96.1 110

12.6 23.6 72 86.6 111.9 125

10 14

— — — — 55.8 70

12.6 23.6 — — 68.4 80

— — 36 43.3 71.6 80

12.6 23.6 36 43.3 87.4 90

— — 72 86.6 104.1 110

12.6 23.6 72 86.6 119.9 125

15 21

— — — — 62.8 80

12.6 23.6 — — 75.4 90

— — 36 43.3 80.4 90

12.6 23.6 36 43.3 96.1 100

— — 72 86.6 112.9 125

12.6 23.6 72 86.6 128.6 150

575 518 632 16.0 91 9.6 64 2 1 2.4

5 6.1

— — — — 40.5 50

12.6 23.6 — — 53.1 60

— — 36 34.6 50.9 60

12.6 23.6 36 34.6 66.7 70

— — 72 69.3 76.9 80

12.6 23.6 72 69.3 92.7 100

10 11

— — — — 45.4 60

12.6 23.6 — — 58.0 70

— — 36 34.6 57.1 60

12.6 23.6 36 34.6 72.8 80

— — 72 69.3 83.0 90

12.6 23.6 72 69.3 98.8 100

15 17

— — — — 51.4 60

12.6 23.6 — — 64.0 80

— — 36 34.6 64.6 70

12.6 23.6 36 34.6 80.3 90

— — 72 69.3 90.5 100

12.6 23.6 72 69.3 106.3 110

LEGEND

FLA — Full Load Amps

HACR — Heating, Air Conditioning and Refrigeration

IFM — Indoor (Evaporator) Fan Motor

LRA — Locked Rotor Amps

MCA — Minimum Circuit Amps

MOCP — Maximum Overcurrent Protection

NEC — National Electrical Code

OFM — Outdoor (Condenser) Fan Motor

RLA — Rated Load Amps

*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.

†Fuse or HACR circuit breaker.

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.

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

Determine maximum deviation from average voltage.

(AB) 457 − 452 = 5 v

(BC) 464 − 457 = 7 v

(AC) 457 − 455 = 2 v

Maximum deviation is 7 v.

Determine percent of voltage imbalance.

7

% Voltage Imbalance = 100 x 457

= 1.53%

This amount of phase imbalance is satisfactory as it is below the maximum

allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%,

contact your local electric utility company immediately.

3. MCA calculation for units with electric heaters over 50 kW = (1.25 x IFM amps) +

(1.00 x heater FLA).

17

Table 4 — Electrical Data — 50EJ,EK,EW,EY024-048 (cont)

UNIT

SIZE

NOMINAL

VOLTAGE

(3 Ph 60 Hz)

VOLTAGE

RANGE COMPRESSOR OFM IFM POWER

EXHAUST ELECTRIC

HEAT* POWER SUPPLY

No. 1 No. 2

Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP†

028

208/230 187 254 39.1 228 39.1 228 2 1 5.3

7.5 24.2/

22.0

— — — — 122.8/120.6 150/150

23.6 41.6 — — 146.4/144.2 175/175

— — 29/36 75.1/ 86.6 124.1/135.8 150/150

23.6 41.6 29/36 75.1/ 86.6 153.6/165.3 175/175

— — 59/72 150.1/173.2 180.4/200.7 200/225

23.6 41.6 59/72 150.1/173.2 209.9/230.2 225/250

10 30.8/

28.0

— — — — 129.4/126.6 150/150

23.6 41.6 — — 153.0/150.2 175/175

— — 29/36 75.1/ 86.6 132.3/143.3 150/150

23.6 41.6 29/36 75.1/ 86.6 161.8/172.8 175/175

— — 59/72 150.1/173.2 188.6/208.2 200/225

23.6 41.6 59/72 150.1/173.2 218.1/237.7 225/250

15 46.2/

42.0

— — — — 144.8/140.6 175/175

23.6 41.6 — — 168.4/164.2 200/200

— — 29/36 75.1/ 86.6 151.6/160.8 175/175

23.6 41.6 29/36 75.1/ 86.6 181.1/190.3 200/200

— — 59/72 150.1/173.2 207.9/225.7 250/250

23.6 41.6 59/72 150.1/173.2 237.4/255.2 275/275

460 414 508 19.9 114 19.9 114 2 1 2.7

7.5 11

— — — — 61.2 80

12.6 23.6 — — 73.8 90

— — 36 43.3 67.9 70

12.6 23.6 36 43.3 83.6 90

— — 72 86.6 100.4 110

12.6 23.6 72 86.6 116.1 125

10 14

— — — — 64.2 80

12.6 23.6 — — 76.8 90

— — 36 43.3 71.6 80

12.6 23.6 36 43.3 87.4 90

— — 72 86.6 104.1 110

12.6 23.6 72 86.6 119.9 125

15 21

— — — — 71.2 90

12.6 23.6 — — 83.8 100

— — 36 43.3 80.4 90

12.6 23.6 36 43.3 96.1 100

— — 72 86.6 112.9 125

12.6 23.6 72 86.6 128.6 150

575 518 632 16.0 91 16.0 91 2 1 2.4

7.5 9

— — — — 49.8 60

12.6 23.6 — — 62.4 70

— — 36 34.6 54.6 60

12.6 23.6 36 34.6 70.3 80

— — 72 69.3 80.5 90

12.6 23.6 72 69.3 96.3 100

10 11

— — — — 51.8 60

12.6 23.6 — — 64.4 80

— — 36 34.6 57.1 60

12.6 23.6 36 34.6 72.8 80

— — 72 69.3 83.0 90

12.6 23.6 72 69.3 98.8 100

15 17

— — — — 57.8 70

12.6 23.6 — — 70.4 80

— — 36 34.6 64.6 70

12.6 23.6 36 34.6 80.3 90

— — 72 69.3 90.5 100

12.6 23.6 72 69.3 106.3 110

18

Table 4 — Electrical Data — 50EJ,EK,EW,EY024-048 (cont)

UNIT

SIZE

NOMINAL

VOLTAGE

(3 Ph 60 Hz)

VOLTAGE

RANGE COMPRESSOR OFM IFM POWER

EXHAUST ELECTRIC

HEAT* POWER SUPPLY

No. 1 No. 2

Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP†

030

208/230 187 254 57.1 266 39.1 228 2 1 5.3

10 30.8/

28.0

— — — — 151.9/149.1 200/200

23.6 41.6 — — 175.5/172.7 225/225

— — 29/36 75.1/ 86.6 151.9/149.1 200/200

23.6 41.6 29/36 75.1/ 86.6 175.5/172.8 225/225

— — 59/72 150.1/173.2 188.6/208.2 200/225

23.6 41.6 59/72 150.1/173.2 218.1/237.7 225/250

15 46.2/

42.0

— — — — 167.3/163.1 200/200

23.6 41.6 — — 190.9/186.7 225/225

— — 29/36 75.1/ 86.6 167.3/163.1 200/200

23.6 41.6 29/36 75.1/ 86.6 190.9/186.7 225/225

— — 59/72 150.1/173.2 207.9/225.7 250/250

23.6 41.6 59/72 150.1/173.2 237.4/255.2 275/275

20 59.4/

54.0

— — — — 180.5/175.1 225/225

23.6 41.6 — — 204.1/198.7 250/250

— — 29/36 75.1/ 86.6 180.5/175.1 225/225

23.6 41.6 29/36 75.1/ 86.6 204.1/198.7 250/250

— — 59/72 150.1/173.2 224.4/240.7 275/275

23.6 41.6 59/72 150.2/173.2 253.9/270.2 300/300

460 414 508 25.6 120 19.9 114 2 1 2.7

10 14

— — — — 71.3 90

12.6 23.6 — — 83.9 100

— — 36 43.3 71.6 90

12.6 23.6 36 43.3 87.4 100

— — 72 86.6 104.1 110

12.6 23.6 72 86.6 119.9 125

15 21

— — — — 78.3 100

12.6 23.6 — — 90.9 110

— — 36 43.3 80.4 100

12.6 23.6 36 43.3 96.1 110

— — 72 86.6 112.9 125

12.6 23.6 72 86.6 128.6 150

20 27

− — — — 84.3 100

12.6 23.6 — — 96.9 110

— — 36 43.3 87.9 100

12.6 23.6 36 43.3 103.6 110

— — 72 86.6 120.4 125

12.6 23.6 72 86.6 136.1 150

575 518 632 20.5 96 16.0 91 2 1 2.4

10 11

— — — — 57.4 70

12.6 23.6 — — 70.0 90

— — 36 34.6 57.4 70

12.6 23.6 36 34.6 72.8 90

— — 72 69.3 83.0 90

12.6 23.6 72 69.3 98.8 100

15 17

— — — — 63.4 80

12.6 23.6 — — 76.0 90

— — 36 34.6 64.6 80

12.6 23.6 36 34.6 80.3 90

— — 72 69.3 90.5 100

12.6 23.6 72 69.3 106.3 110

20 22

— — — — 68.4 80

12.6 23.6 — — 81.0 100

— — 36 34.6 70.8 80

12.6 23.6 36 34.6 86.6 100

— — 72 69.3 96.8 110

12.6 23.6 72 69.3 112.5 125

LEGEND

FLA — Full Load Amps

HACR — Heating, Air Conditioning and Refrigeration

IFM — Indoor (Evaporator) Fan Motor

LRA — Locked Rotor Amps

MCA — Minimum Circuit Amps

MOCP — Maximum Overcurrent Protection

NEC — National Electrical Code

OFM — Outdoor (Condenser) Fan Motor

RLA — Rated Load Amps

*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.

†Fuse or HACR circuit breaker.

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.

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

Determine maximum deviation from average voltage.

(AB) 457 − 452 = 5 v

(BC) 464 − 457 = 7 v

(AC) 457 − 455 = 2 v

Maximum deviation is 7 v.

Determine percent of voltage imbalance.

7

% Voltage Imbalance = 100 x 457

= 1.53%

This amount of phase imbalance is satisfactory as it is below the maximum

allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%,

contact your local electric utility company immediately.

3. MCA calculation for units with electric heaters over 50 kW = (1.25 x IFM amps) +

(1.00 x heater FLA).

19

Table 4 — Electrical Data — 50EJ,EK,EW,EY024-048 (cont)

UNIT

SIZE

NOMINAL

VOLTAGE

(3 Ph 60 Hz)

VOLTAGE

RANGE COMPRESSOR OFM IFM POWER

EXHAUST ELECTRIC

HEAT* POWER SUPPLY

No. 1 No. 2

Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP†

034

208/230 187 254 57.1 266 57.1 266 2 1 5.3

10 30.8/

28.0

— — — — 169.9/167.1 225/200

23.6 41.6 — — 193.5/190.7 250/225

— — 29/36 75.1/ 86.6 169.9/167.1 225/200

23.6 41.6 29/36 75.1/ 86.6 193.5/190.7 250/225

— — 59/72 150.1/173.2 188.6/208.2 225/225

23.6 41.6 59/72 150.1/173.2 218.1/237.7 250/250

15 46.2/

42.0

— — — — 185.3/181.1 225/225

23.6 41.6 — — 208.9/204.7 250/250

— — 29/36 75.1/ 86.6 185.3/181.1 225/225

23.6 41.6 29/36 75.1/ 86.6 208.9/204.7 250/250

— — 59/72 150.1/173.2 207.9/225.7 250/250

23.6 41.6 59/72 150.1/173.2 237.4/255.2 275/275

20 59.4/

54.0

— — — — 198.5/193.1 250/250

23.6 41.6 — — 222.1/216.7 275/250

— — 29/36 75.1/ 86.6 198.5/193.1 250/250

23.6 41.6 29/36 75.1/ 86.6 222.1/216.7 275/250

— — 59/72 150.1/173.2 224.4/240.7 275/275

23.6 41.6 59/72 150.1/173.2 253.9/270.2 300/300

460 414 508 25.6 120 25.6 120 2 1 2.7

10 14

— — — — 77.0 100

12.6 23.6 — — 89.6 110

— — 36 43.3 77.0 100

12.6 23.6 36 43.3 89.6 110

— — 72 86.6 104.1 110

12.6 23.6 72 86.6 119.9 125

15 21

— — — — 84.0 100

12.6 23.6 — — 96.6 110

— — 36 43.3 84.0 100

12.6 23.6 36 43.3 96.6 110

— — 72 86.6 112.9 125

12.6 23.6 72 86.6 128.6 150

20 27

— — — — 90.0 110

12.6 23.6 — — 102.6 125

— — 36 43.3 90.0 110

12.6 23.6 36 43.3 103.6 125

— — 72 86.6 120.4 125

12.6 23.6 72 86.6 136.1 150

575 518 632 20.5 96 20.5 96 2 1 2.4

10 11

— — — — 61.9 80

12.6 23.6 — — 74.5 90

— — 36 34.6 61.9 70

12.6 23.6 36 34.6 74.5 90

— — 72 69.3 83.0 90

12.6 23.6 72 69.3 98.8 100

15 17

— — — — 67.9 80

12.6 23.6 — — 80.5 100

— — 36 34.6 67.9 80

12.6 23.6 36 34.6 80.5 100

— — 72 69.3 90.5 100

12.6 23.6 72 69.3 106.3 110

20 22

— — — — 72.9 90

12.6 23.6 — — 85.5 100

— — 36 34.6 72.9 90

12.6 23.6 36 34.6 86.6 100

— — 72 69.3 96.8 110

12.6 23.6 72 69.3 112.5 125

20

Table 4 — Electrical Data — 50EJ,EK,EW,EY024-048 (cont)

UNIT

SIZE

NOMINAL

VOLTAGE

(3 Ph 60 Hz)

VOLTAGE

RANGE COMPRESSOR OFM IFM POWER

EXHAUST ELECTRIC

HEAT* POWER SUPPLY

No. 1 No. 2

Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP†

038

208/230 187 254 57.1 266 57.1 266 4 1 5.3

10 30.8/

28.0

— — — — 180.5/177.7 225/225

23.6 41.6 — — 204.1/201.3 250/250

— — 29/36 75.1/ 86.6 180.5/177.7 225/225

23.6 41.6 29/36 75.1/ 86.6 204.1/201.3 250/250

— — 59/72 150.1/173.2 188.6/208.2 225/225

23.6 41.6 59/72 150.1/173.2 218.1/237.7 250/250

15 46.2/

42.0

— — — — 195.9/191.7 250/225

23.6 41.6 — — 219.5/215.3 275/250

— — 29/36 75.1/ 86.6 195.9/191.7 250/225

23.6 41.6 29/36 75.1/ 86.6 219.5/215.3 275/250

— — 59/72 150.1/173.2 207.9/225.7 250/250

23.6 41.6 59/72 150.1/173.2 237.4/255.2 275/275

20 59.4/

54.0

— — — — 209.1/203.7 250/250

23.6 41.6 — — 232.7/227.3 275/275

— — 29/36 75.1/ 86.6 209.1/203.7 250/250

23.6 41.6 29/36 75.1/ 86.6 232.7/227.3 275/275

— — 59/72 150.1/173.2 224.4/240.7 275/275

23.6 41.6 59/72 150.1/173.2 253.9/270.2 300/300

460 414 508 25.6 120 25.6 120 4 1 2.7

10 14

— — — — 82.4 100

12.6 23.6 — — 95.0 110

— — 36 43.3 82.4 100

12.6 23.6 36 43.3 95.0 110

— — 72 86.6 104.1 110

12.6 23.6 72 86.6 119.9 125

15 21

— — — — 89.4 110

12.6 23.6 — — 102.0 125

— — 36 43.3 89.4 110

12.6 23.6 36 43.3 102.0 125

— — 72 86.6 112.9 125

12.6 23.6 72 86.6 128.6 150

20 27

— — — — 95.4 110

12.6 23.6 — — 108.0 125

— — 36 43.3 95.4 110

12.6 23.6 36 43.3 108.0 125

— — 72 86.6 120.4 125

12.6 23.6 72 86.6 136.1 150

575 518 632 20.5 96 20.5 96 4 1 2.4

10 11

— — — — 66.7 80

12.6 23.6 — — 79.3 90

— — 36 34.6 66.7 80

12.6 23.6 36 34.6 79.3 90

— — 72 69.3 83.0 90

12.6 23.6 72 69.3 98.8 100

15 17

— — — — 72.7 90

12.6 23.6 — — 85.3 100

— — 36 34.6 72.7 80

12.6 23.6 36 34.6 85.3 100

— — 72 69.3 90.5 100

12.6 23.6 72 69.3 106.3 110

20 22

— — — — 77.7 90

12.6 23.6 — — 90.3 110

— — 36 34.6 77.7 90

12.6 23.6 36 34.6 90.3 110

— — 72 69.3 96.8 110

12.6 23.6 72 69.3 112.5 125

LEGEND

FLA — Full Load Amps

HACR — Heating, Air Conditioning and Refrigeration

IFM — Indoor (Evaporator) Fan Motor

LRA — Locked Rotor Amps

MCA — Minimum Circuit Amps

MOCP — Maximum Overcurrent Protection

NEC — National Electrical Code

OFM — Outdoor (Condenser) Fan Motor

RLA — Rated Load Amps

*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.

†Fuse or HACR circuit breaker.

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.

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

Determine maximum deviation from average voltage.

(AB) 457 − 452 = 5 v

(BC) 464 − 457 = 7 v

(AC) 457 − 455 = 2 v

Maximum deviation is 7 v.

Determine percent of voltage imbalance.

7

% Voltage Imbalance = 100 x 457

= 1.53%

This amount of phase imbalance is satisfactory as it is below the maximum

allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%,

contact your local electric utility company immediately.

3. MCA calculation for units with electric heaters over 50 kW = (1.25 x IFM amps) +

(1.00 x heater FLA).

21

Table 4 — Electrical Data — 50EJ,EK,EW,EY024-048 (cont)

UNIT

SIZE

NOMINAL

VOLTAGE

(3 Ph 60 Hz)

VOLTAGE

RANGE COMPRESSOR OFM IFM POWER

EXHAUST ELECTRIC

HEAT* POWER SUPPLY

No. 1 No. 2

Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP†

044

208/230 187 254 69.2 345 69.2 345 4 1 5.3

15 46.2/

42.0

— — — — 223.1/218.9 275/275

23.6 41.6 — — 246.7/242.5 300/300

— — 29/36 75.1/ 86.6 223.1/218.9 275/275

23.6 41.6 29/36 75.1/ 86.6 246.7/242.5 300/300

— — 59/72 150.1/173.2 223.1/225.7 275/275

23.6 41.6 59/72 150.1/173.2 246.7/255.2 300/300

20 59.4/

54.0

— — — — 236.3/230.9 300/300

23.6 41.6 — — 259.9/254.5 300/300

— — 29/36 75.1/ 86.6 236.3/230.9 300/300

23.6 41.6 29/36 75.1/ 86.6 259.9/254.5 300/300

— — 59/72 150.1/173.2 236.3/240.7 300/300

23.6 41.6 59/72 150.1/173.2 259.9/270.2 300/300

25 74.8/

68.0

— — — — 251.7/244.9 300/300

23.6 41.6 — — 275.3/268.5 300/300

— — 29/36 75.1/ 86.6 251.7/244.9 300/300

23.6 41.6 29/36 75.1/ 86.6 275.3/268.5 300/300

— — 59/72 150.1/173.2 251.7/258.2 300/300

23.6 41.6 59/72 150.2/173.2 275.3/287.7 300/300

460 414 508 28.8 173 28.8 173 4 1 2.7

15 21

— — — — 96.6 125

12.6 23.6 — — 109.2 125

— — 36 43.3 96.6 125

12.6 23.6 36 43.3 109.2 125

— — 72 86.6 112.9 125

12.6 23.6 72 86.6 128.6 150

20 27

— — — — 102.6 125

12.6 23.6 — — 115.2 125

— — 36 43.3 102.6 125

12.6 23.6 36 43.3 115.2 125

— — 72 86.6 120.4 150

12.6 23.6 72 86.6 136.1 150

25 34

− — — — 109.6 125

12.6 23.6 — — 122.2 150

— — 36 43.3 109.6 125

12.6 23.6 36 43.3 122.2 150

— — 72 86.6 129.1 150

12.6 23.6 72 86.6 144.9 175

575 518 632 26.7 120 26.7 120 4 1 2.4

15 17

— — — — 86.7 110

12.6 23.6 — — 99.3 125

— — 36 34.6 86.7 110

12.6 23.6 36 34.6 99.3 125

— — 72 69.3 91.4 110

12.6 23.6 72 69.3 106.3 125

20 22

— — — — 91.7 110

12.6 23.6 — — 104.3 125

— — 36 34.6 91.7 110

12.6 23.6 36 34.6 104.3 125

— — 72 69.3 96.8 125

12.6 23.6 72 69.3 112.5 125

25 27

— — — — 96.7 110

12.6 23.6 — — 109.3 125

— — 36 34.6 96.7 110

12.6 23.6 36 34.6 109.3 125

— — 72 69.3 103.0 125

12.6 23.6 72 69.3 118.8 125

22

Table 3 — Electrical Data — 50EJ,EK,EW,EY024-048 (cont)

UNIT

SIZE

NOMINAL

VOLTAGE

(3 Ph 60 Hz)

VOLTAGE

RANGE COMPRESSOR OFM IFM POWER

EXHAUST ELECTRIC

HEAT* POWER SUPPLY

No. 1 No. 2

Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP†

048

208/230 187 254 82.1 446 69.2 345 4 1 5.3

20 59.4/

54.0

— — — — 252.4/247.0 300/300

23.6 41.6 — — 276.0/270.6 300/300

— — 29/36 75.1/ 86.6 252.4/247.0 300/300

23.6 41.6 29/36 75.1/ 86.6 276.0/270.6 300/300

— — 59/72 150.1/173.2 252.4/247.0 300/300

23.6 41.6 59/72 150.1/173.2 276.0/270.6 300/300

25 74.8/

68.0

— — — — 267.8/261.0 300/300

23.6 41.6 — — 291.4/284.6 300/300

— — 29/36 75.1/ 86.6 267.8/261.0 300/300

23.6 41.6 29/36 75.1/ 86.6 291.4/284.6 300/300

— — 59/72 150.1/173.2 267.8/261.0 300/300

23.6 41.6 59/72 150.1/173.2 291.4/284.6 300/300

30 88.0/

80.0

— — — — 281.0/273.0 300/300

23.6 41.6 — — 304.6/296.6 350/300

— — 29/36 75.1/ 86.6 281.0/273.0 300/300

23.6 41.6 29/36 75.1/ 86.6 304.6/296.6 350/300

— — 59/72 150.1/173.2 281.0/273.0 300/300

23.6 41.6 59/72 150.2/173.2 304.6/296.6 350/300

460 414 508 42.3 223 28.8 173 4 1 2.7

20 27

— — — — 119.5 150

12.6 23.6 — — 132.1 150

— — 36 43.3 119.5 150

12.6 23.6 36 43.3 132.1 150

— — 72 86.6 120.4 150

12.6 23.6 72 86.6 136.1 150

25 34

— — — — 126.5 150

12.6 23.6 — — 139.1 175

— — 36 43.3 126.5 150

12.6 23.6 36 43.3 139.1 175

— — 72 86.6 129.1 150

12.6 23.6 72 86.6 144.9 175

30 40

− — — — 132.5 150

12.6 23.6 — — 145.1 175

— — 36 43.3 132.5 150

12.6 23.6 36 43.3 145.1 175

— — 72 86.6 136.6 175

12.6 23.6 72 86.6 152.4 175

575 518 632 34.6 164 26.7 120 4 1 2.4

20 22

— — — — 101.6 125

12.6 23.6 — — 114.2 125

— — 36 34.6 101.6 125

12.6 23.6 36 34.6 114.2 125

— — 72 69.3 101.6 125

12.6 23.6 72 69.3 114.2 125

25 27

— — — — 106.6 125

12.6 23.6 — — 119.2 150

— — 36 34.6 106.6 125

12.6 23.6 36 34.6 119.2 150

— — 72 69.3 106.6 125

12.6 23.6 72 69.3 119.2 150

30 32

— — — — 111.6 125

12.6 23.6 — — 124.2 150

— — 36 34.6 111.6 125

12.6 23.6 36 34.6 124.2 150

— — 72 69.3 111.6 125

12.6 23.6 72 69.3 124.2 150

LEGEND

FLA — Full Load Amps

HACR — Heating, Air Conditioning and Refrigeration

IFM — Indoor (Evaporator) Fan Motor

LRA — Locked Rotor Amps

MCA — Minimum Circuit Amps

MOCP — Maximum Overcurrent Protection

NEC — National Electrical Code

OFM — Outdoor (Condenser) Fan Motor

RLA — Rated Load Amps

*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.

†Fuse or HACR circuit breaker.

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.

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

Determine maximum deviation from average voltage.

(AB) 457 − 452 = 5 v

(BC) 464 − 457 = 7 v

(AC) 457 − 455 = 2 v

Maximum deviation is 7 v.

Determine percent of voltage imbalance.

7

% Voltage Imbalance = 100 x 457

= 1.53%

This amount of phase imbalance is satisfactory as it is below the maximum

allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%,

contact your local electric utility company immediately.

3. MCA calculation for units with electric heaters over 50 kW = (1.25 x IFM amps) +

(1.00 x heater FLA).

23

DIP — Dual In-Line Package

PEC − Power Exhaust Controller Fig. 14 — Control Box Diagram (Sizes 024-034)

DIP — Dual In-Line Package

PEC — Power Exhaust Controller Fig. 15 — Control Box Diagram (Sizes 038-048)

24

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.

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.

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.

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.

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 CABLE PART NO.

Alpha 2413 or 5463

American A22503

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.

Table 6 — Color Code Recommendations

SIGNAL

TYPE CCN BUS CONDUCTOR

INSULATION COLOR CCN PLUG

PIN NO.

Positive (+) RED 1

Ground WHITE 2

Negative (−) BLACK 3

NOTE: If a cable with a different color scheme is selected,

a similar color code should be adopted for the entire network.

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).

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.

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.

Step 8 — Make Outdoor-Air Inlet Adjustments

ECONOMIZER

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.

Fig. 16 — Field Control Thermostat Wiring

Fig. 17 — Field Control Temperature

Sensor Wiring

NOTE: Sensor part numbers are

as follows:

T55 — HH51BX001

T56 — HH51BX004

T57 — CEC01215303-01

NOTE: On units running Version 1.0 of

the unit control software, the remote start/

stop switch is connected to R and Y1.

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.

6. Add gray foam strip (provided in package) to cross mem-

bers on bottom tray. See Fig. 22.

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.

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.

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.

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.

HOOD SIDE

TOP

FLANGE

SEAL

STRIP

BLACK

Fig. 18 — Adding Seal Strip to

Top of Hood Sides

NOTE: Left side economizer hood has mounting angle without tabs and filter

track assembled end on the opposite side.

Fig. 19 — Economizer Hood Assembly

(Right-Side Economizer Hood Shown)

HOOD SIDE

MOUNTING

FLANGE

Fig. 20 — Adding Seal Strip to

Mounting Flange of Hood Sides

26

HOOD TOP

HOOD SIDE

Fig. 21 — Adding Seal Strip to

Hood Top Mounting Flange

CROSS MEMBER

GRAY FOAM STRIP

Fig. 22 — Adding Foam Strip to Cross Member

HOOD SIDE

(SLOTTED)

HOOD

TOP

Fig. 23 — Adding Foam Strip to Hood Side

BLOCKOFF BAFFLE

GRAY FOAM STRIP

Fig. 24 — Adding Foam Strip to Blockoff Baffle

MOUNTING ANGLE

(WITHOUT TABS)

FILTER TRACK

ASSEMBLY

Fig. 25 — Mounting Angle (Without Tabs)

Attached to Filter Track Assembly

MOUNTING ANGLE

(WITH TABS)

Fig. 26 — Mounting Angle (With Tabs)

Attached to Filter Track Assembly

27

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

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

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

Fig. 27 — Attaching Seal Strip

to Filter Cover

Fig. 28 — Differential Enthalpy Control

and Sensor

HH57AC077

ENTHALPY CONTROL

HH57AC078

ENTHALPY SENSOR

(USED WITH ENTHALPY

CONTROL FOR DIFFERENTIAL

ENTHALPY OPERATION)

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)

RH — Relative Humidity

Fig. 30 — Psychrometric Chart for

Enthalpy Control

CONTROL

CURVE

CONTROL POINT

(APPROX. DEG.)

AT 50% RH

A73 (23)

B70 (21)

C67 (19)

D63 (17)

+

C7400A1004

28

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.

2. Pivot each damper assembly outward until edges of damper

assembly rest against inside wall of unit.

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.

4. With screws saved from Step 1, install brackets on each

side of damper assembly.

5. Remove tape from damper blades.

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.

See Fig. 32. A section of

1

⁄

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.

VAV BUILDING PRESSURE TRANSDUCER — The VAV

building pressure transducer (modulating power exhaust pres-

sure transducer) is located behind the filter access door on

the inner panel. See Fig. 32. A section of

1

⁄

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.

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

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.

MOTORMASTERtIII 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.

VAV — Variable Air Volume

Fig. 32 — Pressure Transducer Locations Fig. 33A — Motormaster III Sensor Location

(Sizes 024-034)

30

Fig. 33B — MotormasterTIII Sensor Location

(Sizes 038 and 044)

Fig. 33C — Motormaster III Sensor Location

(Size 048)

31

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.

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.

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.

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.

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.

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:

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).

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.

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.

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.

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).

Table 7 — VFD Set Point

PRESSURE

(in. wg) VOLTAGE

(vdc) VFD

SET POINT

0.00 2.0 12.0

0.25 2.4 14.4

0.50 2.8 16.8

0.75 3.2 19.2

1.00 3.6 21.6

1.25 4.0 24.0

1.50 4.4 26.4

1.75 4.8 28.8

2.00 5.2 31.2

2.25 5.6 33.6

2.50 6.0 36.0

2.75 6.4 38.4

3.00 6.8 40.8

3.25 7.2 43.2

3.50 7.6 45.6

VFD — Variable Frequency Drive

NOTE: Terminal strip is located inside the VFD (Variable Frequency

Drive) at the bottom.

Fig. 34 — VFD Factory-Installed Jumpers

32

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 receivesa0to10vdcsignal 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 building pressure transducer range is −0.5 to

+0.5 in. wg. It is powered bya0to10vdcsignal. 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.

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.

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).

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.

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 2

−0.25 4

0.00 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.

Table 9 — Power Exhaust Default Set Points

STAGE OFFSET DIFFE-

RENTIAL OFF

VOLTAGE ON

VOLTAGE

OFF

STATIC

PRESSURE

(in. wg)

150% 3% 6.0 6.3 0.00

255% 3% 6.5 6.8 0.06

360% 3% 7.0 7.3 0.12

464% 3% 7.4 7.7 0.18

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 1 2 3 4 5 6 7 8

OPEN VAV CCN/

Sensors Expansion

I/O Board

Field

Test

ON

Modulated

Power

Exhaust

Time Guard Override

ON/ Set Min.

Damper Pos. ON Gas Heat Factory Test ON

CLOSED CV TSTAT Base Board

Only

Field

Test

OFF

CV

Power

Exhaust

Time Guard Override

OFF/ Set Min.

Damper Pos. OFF Electric Heat Factory Test OFF

LEGEND

CCN — Carrier Comfort Network

CV — Constant Volume

I/O — Input/Output

POS. — Position

TSTAT — Thermostat

VAV — Variable Air Volume

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.

Table 10B — DIP Switch Configuration (Version 2.0 of Unit Control Software)

SETTING 1 2 3 4 5 6 7 8

OPEN VAV

VAV — Space Sensor

Installed Expansion

Board Field Test

ON

VAV —

Occupied

Heat

Enabled

Time Guard Override

ON

Gas Heat Heat Pump

Operation

CV — CCN or Sensors

Used

CV —

Modulated

Power

Exhaust

IN CONJUNCTION

WITH FIELD TEST

— Set Minimum

Damper Position

CLOSED CV

VAV — No Space Sensor

Base Control

Board Only Field Test

OFF

VAV —

Occupied

Heat

Disabled Time Guard Override

OFF Electric Heat Air Conditioner

Operation

CV — Thermostat

CV —

Constant

Volume

Power

Exhaust

LEGEND

CCN — Carrier Comfort Network

CV — Constant Volume

VAV — Variable Air Volume

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.

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 12345678

50EJ/EW Closed Closed Closed Closed Closed Closed Closed Closed

50EK/EY Open Closed Closed Closed Open Closed Closed Closed

Table 11B — DIP Switch Factory Settings (Version 2.0 of Unit Control Software)

UNIT 12345678

50EJ/EW Closed Closed Closed Closed Closed Closed Closed Closed

50EK/EY Open Closed Closed Closed Closed Closed Closed Closed

34

DIP switch configurations for Version 1.0 of the Unit Con-

trol Software are as follows:

• 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

• DIP switch 4 is used to field test the unit

• DIP switch 5 configures the unit to use constant volume or

modulated power exhaust

• DIP switch 6 configures the Time Guardtoverride 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:

• 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)

• 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.

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.

Outdoor-Air Inlet Screens — Outdoor-air inlet screens

must be in place before operating unit.

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.

Sequence of Operation

NOTE: Unit is shipped with default values that can be changed

through Service Tool or CCN software.

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, DIPswitch

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.

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

AIRFLOW

(Cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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

4,000 322 0.77 401 1.09 466 1.43 523 1.78 575 2.13 622 2.50 666 2.87 707 3.25

5,000 361 1.14 433 1.50 494 1.86 548 2.23 598 2.62 643 3.00 686 3.40 726 3.80

6,000 403 1.62 468 2.01 526 2.41 577 2.81 624 3.21 668 3.62 709 4.04 748 4.46

7,000 448 2.22 508 2.65 561 3.08 609 3.50 654 3.93 696 4.37 736 4.81 773 5.25

8,000 495 2.97 549 3.42 599 3.88 645 4.33 687 4.79 727 5.25 765 5.71 801 6.18

8,250 507 3.18 560 3.64 609 4.10 654 4.56 696 5.02 735 5.49 773 5.96 809 6.43

9,000 543 3.85 593 4.34 639 4.82 682 5.30 723 5.78 761 6.27 797 6.76 832 7.24

10,000 592 4.90 638 5.41 682 5.91 722 6.42 760 6.93 797 7.44 832 7.95 865 8.46

11,000 642 6.10 685 6.64 725 7.17 764 7.70 800 8.24 835 8.77 868 9.30 900 9.84

12,000 693 7.48 733 8.04 771 8.60 807 9.15 841 9.71 874 10.26 906 10.82 937 11.38

12,500 718 8.23 757 8.80 794 9.37 829 9.94 862 10.51 895 11.08 926 11.64 956 12.21

13,000 744 9.03 781 9.62 817 10.20 851 10.78 884 11.36 915 11.93 946 12.51 975 13.09

13,750 783 10.32 818 10.92 852 11.52 885 12.12 917 12.71 947 13.31 977 13.90 1005 14.50

14,000 795 10.77 831 11.38 864 11.98 896 12.59 928 13.19 958 13.79 987 14.39 1015 14.99

15,000 847 12.71 880 13.34 912 13.96 943 14.59 972 15.21 1001 15.83 1029 16.45 1056 17.08

AIRFLOW

(Cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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

4,000 746 3.64 783 4.03 818 4.44 852 4.85 884 5.26 916 5.68 946 6.11 975 6.54

5,000 764 4.21 800 4.62 834 5.04 868 5.46 900 5.89 930 6.33 960 6.77 989 7.22

6,000 785 4.89 820 5.32 854 5.76 886 6.21 918 6.65 948 7.11 977 7.56 1006 8.02

7,000 809 5.70 843 6.16 876 6.61 908 7.08 939 7.54 968 8.01 997 8.49 1025 8.96

8,000 836 6.65 869 7.12 901 7.60 932 8.08 962 8.57 991 9.05 1019 9.55 1046 10.04

8,250 843 6.91 876 7.39 908 7.87 938 8.36 968 8.84 997 9.34 1025 9.83 1052 10.33

9,000 865 7.74 898 8.23 929 8.73 959 9.23 988 9.74 1016 10.24 1043 10.75 1070 11.27

10,000 897 8.98 928 9.49 958 10.01 987 10.53 1016 11.06 1043 11.58 1070 12.11 1096 12.64

11,000 931 10.37 961 10.91 990 11.45 1018 11.99 1046 12.54 1073 13.08 1099 13.63 1124 14.18

12,000 967 11.94 996 12.49 1024 13.06 1051 13.62 1078 14.18 1104 14.75 1129 15.31 1154 15.88

12,500 985 12.78 1014 13.35 1041 13.92 1068 14.49 1094 15.07 1120 15.64 1145 16.22 1169 16.80

13,000 1004 13.67 1032 14.25 1059 14.83 1086 15.42 1111 16.00 1137 16.59 1161 17.17 1185 17.76

13,750 1033 15.09 1060 15.69 1087 16.29 1112 16.88 1138 17.48 1162 18.08 1186 18.68 — —

14,000 1043 15.59 1070 16.19 1096 16.79 1122 17.40 1147 18.00 1171 18.60 1195 19.21 — —

15,000 1083 17.70 1109 18.32 1134 18.94 1159 19.56 1183 20.19 — — — — — —

AIRFLOW

(Cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

3.4 3.6 3.8

Rpm Bhp Rpm Bhp Rpm Bhp

4,000 1004 6.97 1032 7.41 1059 7.86

5,000 1017 7.67 1045 8.12 1072 8.58

6,000 1034 8.49 1061 8.96 1087 9.43

7,000 1052 9.44 1079 9.93 1105 10.42

8,000 1073 10.54 1099 11.04 1125 11.55

8,250 1079 10.84 1105 11.34 1130 11.85

9,000 1096 11.78 1122 12.30 1147 12.82

10,000 1122 13.18 1147 13.71 1171 14.25

11,000 1149 14.73 1173 15.29 1197 15.84

12,000 1178 16.45 1202 17.03 — —

12,500 1193 17.38 ————

13,000 ——————

13,750 ——————

14,000 ——————

15,000 ——————

LEGEND

Bhp — Brake Horsepower

NOTES:

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.

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

AIRFLOW

(Cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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

8,000 448 2.18 498 2.87 544 3.25 589 3.64 631 4.04 671 4.44 710 4.86 747 5.27

9,000 492 2.87 537 3.68 580 4.09 621 4.50 660 4.92 698 5.35 734 5.78 769 6.22

10,000 537 3.69 578 4.63 617 5.07 655 5.50 692 5.95 727 6.39 761 6.85 795 7.30

11,000 582 4.65 620 5.75 657 6.20 692 6.66 726 7.13 759 7.60 792 8.07 823 8.55

12,000 629 5.75 664 7.02 698 7.50 730 7.98 763 8.47 794 8.96 824 9.45 854 9.95

13,000 675 7.00 708 8.48 739 8.98 770 9.48 800 9.99 830 10.50 859 11.01 887 11.53

14,000 722 8.42 753 10.11 782 10.63 811 11.16 840 11.69 868 12.22 895 12.75 922 13.29

15,000 770 10.00 798 11.94 826 12.48 853 13.03 880 13.57 907 14.13 932 14.68 958 15.24

16,000 817 11.76 844 13.96 870 14.53 896 15.09 922 15.66 947 16.23 971 16.81 995 17.38

17,000 865 13.70 890 16.19 915 16.78 940 17.37 964 17.95 988 18.54 1011 19.14 1034 19.73

18,000 913 15.83 937 18.64 961 19.25 984 19.85 1007 20.46 1030 21.07 1052 21.68 1074 22.30

19,000 961 18.16 984 21.32 1006 21.94 1029 22.56 1050 23.19 1072 23.82 1093 24.45 1115 25.08

20,000 1009 20.69 1031 24.22 1052 24.86 1074 25.50 1095 26.15 1115 26.80 1136 27.45 1156 28.10

AIRFLOW

(Cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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

8,000 783 5.70 818 6.13 852 6.56 884 7.00 916 7.45 947 7.90 978 8.36 1007 8.82

9,000 803 6.66 836 7.11 869 7.56 900 8.02 930 8.48 960 8.95 989 9.42 1018 9.90

10,000 827 7.77 858 8.23 889 8.70 919 9.18 948 9.66 977 10.15 1005 10.64 1032 11.13

11,000 854 9.03 884 9.51 913 10.00 941 10.50 969 11.00 997 11.50 1024 12.01 1050 12.52

12,000 883 10.45 911 10.96 939 11.47 967 11.98 993 12.50 1020 13.02 1046 13.54 1071 14.07

13,000 914 12.05 942 12.57 968 13.10 994 13.63 1020 14.17 1045 14.71 1070 15.25 1094 15.79

14,000 948 13.83 974 14.37 999 14.92 1024 15.47 1049 16.02 1073 16.58 1096 17.14 1120 17.70

15,000 983 15.80 1007 16.36 1032 16.92 1056 17.49 1079 18.06 1102 18.64 1125 19.21 1148 19.79

16,000 1019 17.96 1043 18.54 1066 19.13 1089 19.71 1111 20.30 1134 20.89 1156 21.49 1177 22.08

17,000 1057 20.33 1079 20.93 1102 21.53 1124 22.14 1145 22.75 1167 23.35 1188 23.97 — —

18,000 1096 22.91 1117 23.53 1138 24.15 1160 24.78 1180 25.40 — — — — — —

19,000 1135 25.72 1156 26.36 1176 26.99 1197 27.63 — — — — — — — —

20,000 1176 28.75 1196 29.41 — — — — — — — — — — — —

AIRFLOW

(Cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

3.4 3.6 3.8

Rpm Bhp Rpm Bhp Rpm Bhp

8,000 1036 9.29 1065 9.76 1092 10.24

9,000 1046 10.38 1073 10.87 1100 11.36

10,000 1059 11.63 1086 12.13 1112 12.64

11,000 1076 13.03 1102 13.55 1127 14.07

12,000 1096 14.60 1121 15.13 1145 15.67

13,000 1118 16.34 1142 16.89 1165 17.45

14,000 1143 18.26 1166 18.83 1188 19.40

15,000 1170 20.37 1192 20.96 — —

16,000 1199 22.68 ————

17,000 ——————

18,000 ——————

19,000 ——————

20,000 ——————

LEGEND

Bhp — Brake Horsepower

NOTES:

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.

37

Table 14 — Fan Performance, 50EJ048 — Vertical Discharge Units

FOR EW UNITS, REDUCE NET AVAILABLE EXTERNAL STATIC PRESSURE BY 0.5 IN. WG

AIRFLOW

(Cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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

13,000 683 7.10 715 8.59 747 9.09 777 9.60 808 10.11 837 10.62 866 11.14 894 11.66

14,000 730 8.53 761 10.25 790 10.77 819 11.30 847 11.83 875 12.36 902 12.90 929 13.44

15,000 778 10.14 807 12.10 834 12.65 862 13.19 888 13.75 915 14.30 941 14.86 966 15.42

16,000 826 11.93 853 14.15 879 14.72 905 15.29 931 15.86 955 16.44 980 17.01 1004 17.59

17,000 875 13.90 900 16.42 925 17.01 949 17.60 973 18.19 997 18.78 1020 19.38 1043 19.98

18,000 923 16.06 947 18.90 971 19.51 994 20.12 1017 20.73 1039 21.34 1062 21.96 1084 22.58

19,000 972 18.42 995 21.61 1017 22.24 1039 22.87 1061 23.50 1083 24.13 1104 24.76 1125 25.40

20,000 1021 20.98 1042 24.55 1064 25.20 1085 25.85 1106 26.50 1126 27.15 1147 27.80 1167 28.46

AIRFLOW

(Cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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

13,000 921 12.18 948 12.71 975 13.24 1001 13.77 1026 14.30 1051 14.84 1076 15.39 1100 15.93

14,000 955 13.98 981 14.53 1006 15.08 1031 15.63 1056 16.18 1080 16.74 1103 17.30 1127 17.86

15,000 991 15.98 1015 16.54 1040 17.11 1063 17.68 1087 18.25 1110 18.83 1133 19.41 1155 19.99

16,000 1028 18.17 1051 18.76 1074 19.34 1097 19.93 1120 20.52 1142 21.12 1164 21.71 1185 22.31

17,000 1066 20.58 1089 21.18 1111 21.78 1133 22.39 1154 23.00 1175 23.61 1197 24.23 — —

18,000 1106 23.19 1127 23.82 1148 24.44 1169 25.07 1190 25.69 — — ————

19,000 1146 26.04 1166 26.68 1187 27.32 — — — — — — ————

20,000 1187 29.11 — — — — — — — — — — ————

AIRFLOW

(Cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

3.4 3.6 3.6

Rpm Bhp Rpm Bhp Rpm Bhp

13,000 1124 16.48 1148 17.03 1171 17.59

14,000 1150 18.43 1173 19.00 1195 19.57

15,000 1177 20.57 1199 21.16 — —

16,000 ——————

17,000 ——————

18,000 ——————

19,000 ——————

20,000 ——————

LEGEND

Bhp — Brake Horsepower

NOTES:

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 6,000 2000 6,000 10,000

028 7,500 2500 7,500 12,500

030 8,250 2750 8,250 13,750

034 9,000 3000 9,000 15,000

038 10,500 3500 10,500 17,500

044 12,000 4000 12,000 20,000

048 13,500 4500 13,500 22,500

LEGEND

CV — Constant Volume

VAV — Variable Air Volume

38

Table 16 — Motor Limitations

STANDARD EFFICIENCY MOTORS

Nominal

Hp Maximum

Bhp Maximum Amps Maximum

Watts Motor

Efficiency

208 230 460 575

55.9 17.94 16.99 — — 5,348 82.3

5.9 — — 8.50 5.78 5,240 84.0

7.5 8.7 25.52 24.36 — — 7,717 84.1

9.5 — — 13.30 9.63 8,549 82.9

10 10.2 26.93 25.50 — — 8,879 85.7

11.8 — — 14.75 11.33 10,284 85.6

15 15.3 42.84 40.80 — — 13,686 83.4

18.0 — — 24.00 18.00 15,891 84.5

20 22.4 59.36 56.00 — — 19,032 87.8

23.4 — — 29.25 22.82 19,950 87.5

25 28.9 76.30 72.83 — — 24,499 88.0

29.4 — — 37.04 28.69 25,181 87.1

30 35.6 92.56 87.81 — — 29,378 90.4

34.7 — — 42.80 n/a 29,316 88.3

HIGH EFFICIENCY MOTORS

Nominal

Hp Maximum

Bhp Maximum Amps Maximum

Watts Motor

Efficiency

208 230 460 575

5

5.9 16.76 13.92 — — 5,030 87.5

5.9 — — 6.96 — 5,030 87.5

5.9 — — — 5.66 4,918 89.5

7.5

8.7 26.10 22.27 — — 7,334 88.5

9.5 — — 12.16 — 8,008 88.5

9.5 — — — 9.50 7,728 91.7

10

10.2 28.56 24.89 — — 8,502 89.5

11.8 — — 14.40 — 9,836 89.5

11.8 — — — 11.68 9,600 91.0

15

15.3 45.08 39.17 — — 12,543 91.0

18.0 — — 23.04 — 14,756 91.0

18.0 — — — 18.12 14,439 93.0

20

22.4 63.84 55.55 — — 18,363 91.0

23.4 — — 29.02 — 19,183 91.0

23.4 — — — 23.17 18,650 93.6

25

28.9 80.69 70.05 — — 23,511 91.7

29.4 — — 35.63 — 23,918 91.7

29.4 — — — 28.81 23,432 93.6

30

35.6 102.65 89.00 — — 28,742 92.4

34.7 — — 43.38 — 28,015 92.4

34.7 — — — 33.89 27,656 93.6

LEGEND

BHP — Brake Horsepower

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.

Table 17 — User Defined Set Points

SET POINT FORMAT DESCRIPTION LIMITS DEFAULT

OHSP xx.xF Occupied Heat Set Point 55 to 80 F 68

OCSP xx.xF Occupied Cool Set Point 55 to 80 F 78

UHSP xx.xF Unoccupied Heat Set Point 40 to 80 F 55

UCSP xx.xF Unoccupied Cool Set Point 75 to 95 F 90

SASP xx.xF Supply Air Set Point 45 to 70 F 55

OATL xx.xF Hi OAT Lockout Temperature 55 to 75 F 65

NTLO xx.xF Unoccupied OAT Lockout Temperature 40 to 70 F 50

RTIO xx.x Reset Ratio 0 to 10 3

LIMT xx.x^F Reset Limit 0 to 20 F 10

MDP xxx% Minimum Damper Position 0 to 100% 20

IAQS xxxx IAQ Set Point 1 to 5000 650

UHDB xx.x^F Unoccupied Heating Deadband 0 to 10 1

UCDB xx.x^F Unoccupied Cooling Deadband 0 to 10 1

LTMP xx.xF Low Temp. Min. Position 0 to 100 10

HTMP xx.xF High Temp. Min. Position 0 to 100 35

PES1 xx.xF CV Power Exhaust Stage 1 Point 0 to 100 25

PES2 xx.xF CV Power Exhaust Stage 2 Point 0 to 100 75

LEGEND

CV — Constant Volume

IAQ — Indoor Air Quality

OAT — 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.

The Time Guardtfunction 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.

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

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).

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

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.

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 ONLY WITH 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 ONLY WITH 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.

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.

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).

Fig. 35 — Heat Interlock Relay Wiring

Fig. 36 — Space Temperature Sensor Wiring

41

CAPACITY CONTROL, COOLING — The cooling capac-

ity staging tables are shown in Tables 18 and 19.

Table 18 — Cooling Capacity Staging Table

CV Units with 2 Compressors

STAGES 0 1

ECONOMIZER 23

Compressor 1 Off Off On On

Compressor 2 Off Off Off On

NOTE: On CV units that require additional unloading, add suction pres-

sure unloaders on Compressor 1 only.

Table 19 — Cooling Capacity Staging Table

VAV Units with 2 Compressors

and 2 Unloaders*

STAGES 0 123456

Compressor 1 OffOnOnOnOnOnOn

Unloader 1 Off On On Off On On Off

Unloader 2 Off On Off Off On Off Off

Compressor 2 Off Off Off Off On On On

*40 ton units have only 1 unloader.

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.

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 GUARDtCIRCUIT — 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.

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.

MOTORMASTERtIII 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.

SERVICE

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.

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.

Each door is held closed with 3 latches. The latches are

secured to the unit with a single

1

⁄

4

-in.-20x

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.

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.

Fig. 37 — Door Latch

42

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.

CONDENSER COIL — Clean condenser coil annually and

as required by location and outdoor-air conditions. Inspect

coil monthly — clean as required.

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.

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.

Lubrication

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

between

1

⁄

4

and

1

⁄

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 Regal AFB-2*

Mobil Mobilplex EP No. 1

Sunoco Prestige 42

Texaco Multifak 2

*Preferred lubricant because it contains rust and oxidation inhibitors.

CONDENSER AND EVAPORATOR-FAN MOTOR BEAR-

INGS — The condenser and evaporator-fan motors have

permanently-sealed bearings, so no field lubrication is

necessary.

Evaporator Fan Performance Adjustment

(Fig. 38) — Fan motor pulleys are factory set for speed

shown in Table 1 (factory speed setting).

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.

IMPORTANT: Check to ensure that the unit drive

matches the duct static pressure in Tables 12 to 14.

Evaporator Fan Service and Replacement

1. Turn off unit power.

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.

Fig. 38 — Evaporator-Fan Pulley Alignment

and Adjustment

43

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.

3. Loosen fan hub setscrews.

4. Adjust fan height on shaft using a straightedge placed across

venturi and measure per Fig. 40.

5. Tighten setscrews and replace fan guard.

6. Turn on unit power.

Evaporator-Fan Motor Replacement

1. Shut off unit power supply.

2. Remove upper outside panel and open hinged door to

gain access to motor.

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.

9. Remove the nuts from the motor mounting hex bolts and

remove motor.

10. Reverse above steps to install new motor.

Power Failure — Dampers have a spring return. In event

of power failure, dampers will return to fully closed position

until power is restored.

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.

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.

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. 39 — Belt Tension Adjustment

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.

IMPORTANT: After a prolonged shutdown or serv-

ice job, energize the crankcase heaters for 24 hours

before starting the compressors.

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.

CONDENSER-FAN MOTOR PROTECTION — Each

condenser-fan motor is internally protected against

overtemperature.

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.

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.

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.

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.

Replacement Parts — A complete list of replacement

parts may be obtained from any Carrier distributor upon

request.

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 — Freeze Protection Switch

HPS — High-Pressure Switch

LPS — Low-Pressure Switch

Fig. 43 — Typical Refrigerant Circuiting

(50EJ,EK,EW,EY024-034)

46

LEGEND

FPS — Freeze Protection Switch

HPS — High-Pressure Switch

LPS — Low-Pressure Switch

Fig. 44 — Typical Refrigerant Circuiting

(50EJ,EK,EW,EY038,044)

47

LEGEND

FPS — Freeze Protection Switch

HPS — High-Pressure Switch

LPS — Low-Pressure Switch

Fig. 45 — Typical Refrigerant Circuiting

(50EJ,EW048)

48

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

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.

Table 20 — Control Board LED Alarms

LED

BLINKS ERROR

CODE DESCRIPTION TROUBLESHOOTING

COMMENTS

1Normal Operation The expansion board and control board flash the red LED in one-

second intervals when the board is operating properly.

2HF-13 Compressor 1 Safety 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.

3HF-14 Compressor 2 Safety 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.

4HF-15 Thermostat Failure 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.

5HF-05 SAT Thermistor Failure The supply-air temperature (SAT) sensor has failed. First check for

wiring errors, then replace sensor.

6HF-06 OAT Thermistor Failure The outside-air temperature (OAT) sensor has failed. First check

for wiring errors, then replace sensor.

7HF-03 Space Temp. Sen. Failure The space temperature sensor has failed. First check for wiring

errors, then replace sensor.

8HF-12 RAT Thermistor Failure 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.

9SE-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 HF-16 Control Board Failure Generated when hardware has failed on control board. Replace

the control board.

11 HF-17 Expansion Board Failure Generated when hardware has failed on the expansion board.

Replace the expansion board.

LEGEND

DIP — Dual In-Line Package

LED — Light-Emitting Diode

VAV — Variable Air Volume

49

Tables 21-23 show the input and output channel designations.

Table 21 — I/O Channel Designations

Base Module — CV

TERMINAL

NO. ASSIGNMENT

T1-2 SPT (CCN) — 10KVThermistor

T3-4 STO (CCN) — 10KVThermistor

T5-6 OAT — 5KVThermistor

T7-8 SAT — 5KVThermistor

T9-10 —

T11-12 SAT Reset — AI (2-10 vdc)

T13-14 —

T15-16 —

T17-25 Y1 or Remote Start/Stop — DI (24 vac)

T18-25 Y2 — DI (24 vac)

T19-25 W1 — DI (24 vac)

T20-25 W2 — DI (24 vac)

T21-25 G — DI (24 vac)

T22-25 Compressor 1 Safety — DI (24 vac)

T23-25 Compressor 2 Safety — DI (24 vac)

T24-25 Outside Air Enthalpy — DI (24 vac)

T26-27 Economizer Pos. — AO (4-20 mA)

T28-29 Heat 1 Relay — DO (24 vac)

T30-29 Heat 2 Relay — DO (24 vac)

T31-32 CV Power Exhaust 1/Modulating Pwr Exht — DO

(115 vac)

T33-32 CV Power Exhaust2—DO(115vac)

T34-35 Condenser Fan — DO (115 vac)

T36-35 OFC2 — DO (115 vac)

T37-38 —

T39-38 —

K1 Indoor Fan Relay — DO (HV)

K2 Compr.1—DO(HV)

K3 Compr.2—DO(HV)

LEGEND

(Tables 21 and 22)

AI — Analog Input

AO — Analog Output

CCN — Carrier Comfort Network

CV — Constant Volume

DI — Direct Input

DO — Direct Output

HV — High Voltage

KV—Kilo-Ohms

OAT — Outdoor-Air Temperature

OFC — Outdoor Fan Contactor

RAT — Return-Air Temperature

SAT — Supply-Air Temperature

SPT — Space Temperature

STO — Space Temperature Offset

T—Terminal

VAV — Variable Air Volume

Table 22 — I/O Channel Designations

Base Module — VAV

TERMINAL

NO. ASSIGNMENT

T1-2 SPT (CCN) — 10KVThermistor

T3-4 RAT — 5KVThermistor

T5-6 OAT — 5KVThermistor

T7-8 SAT — 5KVThermistor

T9-10 —

T11-12 SAT Reset — AI (2-10 vdc)

T13-14 —

T15-16 —

T17-25 Remote Start/Stop — DI (24 vac)

T18-25 —

T19-25 —

T20-25 —

T21-25 —

T22-25 Compressor 1 Safety — DI (24 vac)

T23-25 Compressor 2 Safety — DI (24 vac)

T24-25 Outside Air Enthalpy — DI (24 vac)

T26-27 Economizer Pos. — AO (4-20 mA)

T28-29 Heat 1 Relay — DO (115 vac)

T30-29 Heat Interlock Relay — DO (115 vac)

T31-32 Modulated Power Exhaust — DO (115 vac)

T33-32 —

T34-35 Condenser Fan — DO (115 vac)

T36-35 OFC2 — DO (115 vac)

T37-38 Unloader1—DO(115vac)

T39-38 Unloader2—DO(115vac)

K1 Indoor Fan Relay — DO (HV)

K2 Compr.1—DO(HV)

K3 Compr.2—DO(HV)

50

Table 23 — I/O Channel Designations Expansion

Module — CV and VAV

TERMINAL

NO. ASSIGNMENT

T1-2 —

T3-4 —

T5-6 —

T7-8 —

T9-10 —

T11-12 IAQ Indoor — AI (2-10 vdc)

T13-14 IAQ Outdoor — AI (2-10 vdc)

T15-16 —

T17-25 Fan Status — DI (24 vac)

T18-25 Filter Status — DI (24 vac)

T19-25 Field Applied Status — DI (24 vac)

T20-25 Demand Limit — DI (24 vac)

T21-25 Fire — Unit Shutdown — DI (24 vac)

T22-25 Fire — Pressurization — DI (24 vac)

T23-25 Fire — Evacuation — DI (24 vac)

T24-25 Fire — Smoke Purge — DI (24 vac)

T26-27 —

T28-29 —

T30-29 Alarm Light Indicator — DO (24 vac)

T31-32 Power Exhaust Fire #1 — DO (115 vac)

T33-32 Power Exhaust Fire #2 — DO (115 vac)

T34-35 Power Exhaust Fire #3 — DO (115 vac)

T36-35 Power Exhaust Fire #4 — DO (115 vac)

T37-38 —

T39-38 —

K1 —

K2 —

K3 —

LEGEND

AI — Analog Input

DI — Direct Input

DO — Direct Output

IAQ — Indoor Air Quality

T—Terminal

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

Tab 1b

PC 111 Catalog No. 535-006 Printed in U.S.A. Form 50E-3SI Pg 54 8-96 Replaces: 50E-1SI

START-UP CHECKLIST

MODEL NO.:

SOFTWARE VERSION (SEE FIG. 15)

DATE:

SERIAL NO.:

TECHNICIAN:

PRE-START-UP:

MVERIFY THAT DIP SWITCH SETTINGS ARE CORRECT

MVERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT

MREMOVE ALL SHIPPING HOLDDOWN BOLTS AND BRACKETS PER INSTRUCTIONS

MVERIFY INSTALLATION OF ECONOMIZER HOOD

MVERIFY INSTALLATION OF ALL OPTIONS AND ACCESSORIES

MVERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS

MVERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT

MCHECK THAT INDOOR-AIR FILTER IS CLEAN AND IN PLACE

MVERIFY THAT UNIT IS LEVEL WITHIN TOLERANCES

MCHECK FAN WHEELS AND PROPELLERS FOR LOCATION IN HOUSING/ORIFICE, AND VERIFY SET SCREW

IS TIGHT

MVERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED

MVERIFY 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 L1 L2 L3

— COMPRESSOR NO. 2 L1 L2 L3

SUPPLY FAN AMPS (CV) EXHAUST FAN AMPS

(VAV) *

*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 F DB (Dry-Bulb)

RETURN-AIR TEMPERATURE F DB F WB (Wet-Bulb)

COOLING SUPPLY AIR F

ELECTRIC HEAT SUPPLY AIR (IF SO EQUIPPED) F

PRESSURES

REFRIGERANT SUCTION CIRCUIT NO. 1 PSIG CIRCUIT NO. 2 PSIG

REFRIGERANT DISCHARGE CIRCUIT NO. 1 PSIG CIRCUIT NO. 2 PSIG

MVERIFY REFRIGERANT CHARGE USING CHARGING CHARTS ON PAGE 45

CL-1

START-UP CHECKLIST (cont)

GENERAL

MECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS

MENSURE DRIVES OPERATE WITHIN LIMITS OF FAN PERFORMANCE TABLES

HIGH-PRESSURE SWITCH SETTING PSIG

LOW-PRESSURE SWITCH SETTING PSIG

MOTOR PULLEY PART NUMBER

FAN PULLEY PART NUMBER

BELT PART NUMBER

BELT SIZE in.

FILTER QUANTITY

FILTER SIZES in.

ADDITIONAL NOTES:

----------------------------------------------------------------------------------------

CUT ALONG DOTTED LINE CUT ALONG DOTTED LINE

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

Tab 1b

PC 111 Catalog No. 535-006 Printed in U.S.A. Form 50E-3SI Pg CL-2 8-96 Replaces: 50E-1SI