Carrier 50EW, 50EY, 50EJ, 50EK User Manual

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Page 1

50EJ,EK,EW,EY024-048

Single-Package Rooftop Units

Electric Cooling with Electric Heat Option

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 components. Only trained andqualiﬁed service personnel should install, repair, or service air-conditioning equipment.

Untrained personnel can perform basic maintenance functions of cleaning coils and ﬁlters and replacing ﬁlters. All other operations should be performed by trained service personnel. When working on air-conditioning equipment, observe precautions in the literature, tags and labels attached to the unit, and other safety precautions that may apply.

Follow all safety codes.W earsafetyglasses and work gloves. Use quenching cloth for unbrazing operations. Have ﬁre extinguishers available for all brazing operations.

IMPORTANT — READ BEFORE INSTALLING

IMPORTANT: Due to upgrades in unit control software 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 Version number. Version 1.0 is the original version. Version 2.0 is the current version. Differences in installation, 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. Accessory 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 supplied with the roof curb as shown in Fig. 1. Improperly 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 Instructions for additional information as required. When accessory roof curb is used, unit may be installed on class A, B, or C roof covering material.

ALTERNATEUNITSUPPORT—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.

Before performing service or maintenance operations on unit, turn offmain power switch to unit. Electrical shock could cause personal injury.

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

Book 1 Tab 1b

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

Page 2

NOTE: To prevent standing water in the drain pan of the indoor section and the heat exchangers, UNIT CAN ONLY BE PITCHED AS SHOWN.

NOTES:

1. Unlessotherwisespeciﬁed,alldimensions are to outside 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*

*From edge of unit to horizontal.

(Degrees and Inches)

Deg. in. Deg. in.

1.0 2.9 .50 .75

Page 3

NOTES:

1. Unlessotherwisespeciﬁed,alldimensions are to outside 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*

*From edge of unit to horizontal.

(Degrees and Inches)

Deg. in. Deg. in.

1.0 2.9 .50 .75

Page 4

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. Bottom ducts designed to be attached toaccessoryroof curb. If unitismounted on dunnage, it is recommended the ductsbe 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 ﬁeldsupplied 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)

024 4016 5-11 028 4102 5- 8 030 4102 5- 8 034 4102 5- 8

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

⁄83-511⁄16823 914 1199 1080

⁄23-75⁄8844 859 1210 1189

CORNER WEIGHT

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

(lb)

Page 5

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. Bottom ducts designed to be attached to accessory roof curb. If unit is mountedondunnage,itisrecommendedtheductsbesupportedbycross 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.

LEGEND

VFD — Variable Frequency Drive

UNIT SIZE

50E

OPERATING

WEIGHT

(lb)

J038 4282 7-7 J/K044 4508 7-3 J048 4795 7-2

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

⁄163-101⁄2961 858 1162 1302

⁄163-111⁄2973 868 1258 1409

⁄163-103⁄321007 915 1368 1505

CORNER WEIGHT

(lb)

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

Page 6

NOTES:

1. Weights include economizer (Std)

2. Center of gravity.

3. Donotlocateadjacent 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 ductwork connection is recommended for covering both return and both supply openings.

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

UNIT SIZE

50EW/EY

OPERATING

WEIGHT

(lb)

024 4016 5-11 028 4102 5- 8 030 4102 5- 8 034 4102 5- 8

LEGEND

VFD — Variable Frequency Drive

CORNER WEIGHT

(lb)

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

⁄83-511⁄16823 914 1199 1080

⁄23-75⁄8844 859 1210 1189

Page 7

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 ductwork connection is recommended for covering both return and both supply air openings.

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

UNIT SIZE

50E

W038 4282 7-7 W/Y044 4508 7-3 W048 4795 7-2

OPERATING

WEIGHT

(lb)

LEGEND

VFD — Variable Frequency Drive

CORNER WEIGHT

(lb)

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

⁄163-101⁄2961 858 1162 1302

⁄163-111⁄2973 868 1258 1409

⁄163-103⁄321007 915 1368 1505

Page 8

Step2 — 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 distance 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

024 4016 1822 87.68 2227 71.4 1814 41.7 1059 028

034 038* 4282 1942 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.

WEIGHT A B C

lb kg in. mm in. mm in. mm

4102 1860 87.68 2227 68.5 1740 43.6 1107030

91.3 2319 46.5 1181

150 3810

Fig. 7 — Rigging Label

Page 9

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

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

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 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.) 111⁄ 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

⁄

13⁄

15⁄

13⁄

LEGEND

Al — Aluminum Cu — Copper

*Weightof unit does not includevariable frequencydrive (VFD), barometric relief, orpower

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 1uses the lower portion ofcondenser 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.

⁄89 Copper Tubes, Aluminum Lanced or Copper Fins

⁄89 Copper Tubes, Aluminum or Copper Plate Fins, Intertwined Circuits

13⁄

15⁄

13⁄

15⁄

111⁄

NOTES:

1. See Table 2 for evaporator fan motor data.

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

VFD (Hp)

111⁄

VFD WEIGHTS (lb)

208/230 v 460 v 575 v

5 20 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

13⁄

15⁄

111⁄

Page 10

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

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

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 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.) 111⁄ 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

⁄

15⁄

LEGEND

Al — Aluminum Cu — Copper

*Weightof unit does not includevariable frequencydrive (VFD), barometric relief, orpower

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 1uses the lower portion ofcondenser 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.

⁄89 Copper Tubes, Aluminum Lanced or Copper Fins

⁄89 Copper Tubes, Aluminum or Copper Plate Fins, Intertwined Circuits

15⁄

NOTES:

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

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

VFD (Hp)

111⁄

15⁄

11⁄

15⁄

VFD WEIGHTS (lb)

208/230 v 460 v 575 v

5 20 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

111⁄

17⁄

Page 11

Table 2 — Evaporator Fan Motor Data

UNIT

MOTOR

SIZE

024

028

030

034

038

044

048

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

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

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

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

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

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

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

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

MOTOR

SHAFT

DIAMETER

(in.)

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

FAN SHAFT SPEED

(rpm)

MOTOR

SHEAVE

MOTOR

SHEAVE

PITCH

DIAMETER

(in.)

BUSHING

DIAMETER

⁄16inches.

ROOF MOUNT — Check building codes for weight distribution requirements.

(in.)

FAN

SHEAVE

FAN

SHEAVE

PITCH

DIAMETER

(in.)

BUSHING

DIAMETER

(in.)

BELT

OUTSIDE

BELT

LENGTH

BELT

TENSION

(Lb @

.24 in.)

Step 3 — Field Fabricate Ductwork — Secure all

ducts to building structure. Use ﬂexible duct connectors between 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 approximately 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 ductwork 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 structure. 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

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

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

the drain location. One 1-in. FPT coupling is provided inside unit evaporator section for condensate drain connection. 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 quality guidelines.

Page 12

Fig. 10 — Condensate Drain Connections

(Typical Roof Curb or Slab Mount Shown)

Step 6 — Controls Options — The control options

that the units can provide are based on the following parameters: CV (constant volume) or VAV (variable air volume) operation; stand-alone unit with ﬁeld-supplied sensors installed (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 Network; 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 occupancy 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 Carrierapproved 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 supply 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 exhaust controller

• support a ﬁeld test for ﬁeld checkout

• control of 2 stages of CV power exhaust

• compressor Time Guardt (power up and minimum offand on times)

Additional features are provided by accessing the standard 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 temperature 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 occupied 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 CV Unit with SPT Sensor and Remote

Start/Stop Switch VAV Unit Remote Start/Switch Only VAV Unit with SPT Sensor and Remote

Start/Stop Switch UNITS RUNNING VERSION 2.0 UNIT CONTROL SOFTWARE

CV or VAV Unit with SPT Sensor CV Unit with SPT Sensor and Remote

Start/Stop Switch VAV Unit Remote Start/Stop Switch Only VAV Unit with SPT Sensor and Remote

Start/Stop Switch

CV — Constant Volume SAT — Supply-Air Temperature NA — Not Available SPT — Space Temperature RAT — Return-Air Temperature VAV — Variable Air Volume

LEGEND

Unoccupied Cooling — 90 F (SPT) Occupied Cooling — NA

Unoccupied Cooling — 90 F (SPT) Occupied Cooling — 78 F (SPT)

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

Unoccupied Cooling — 90 F (SPT) Occupied Cooling — 55 F (SAT)

Unoccupied Cooling — 90 F (SPT) Occupied Cooling — NA

Unoccupied Cooling — 90 F (SPT) Occupied Cooling — 78 F (SPT)

Unoccupied Cooling — 90 F (RAT) Occupied Cooling — 55 F (SAT)

Unoccupied Cooling — 90 F (SPT) Occupied Cooling — 55 F (SAT)

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

Unoccupied Heating — 55 F (SPT) Occupied Heating — 68 F (SPT)

Unoccupied Heating — NA Occupied Heating — NA

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

Unoccupied Heating — 55 F (SPT) Occupied Heating — 68 F (SPT)

Unoccupied Heating — 55 F (RAT) Occupied Heating — 68 F (RAT)*

Unoccupied Heating — 55 F (SPT) Occupied Heating — 68 F (RAT)*

*With DIP Switch No. 5 conﬁgured to OPEN (Occupied Heat Enabled). NOTE: Space temperature sensor and remote stop/switch are ﬁeld-supplied.

Page 13

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 average 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, Service, and Set Point data table through network software

When the unit is equipped with a ﬁeld-supplied space temperature 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 installed). 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 returnair 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 exhaust required)

• provides CCN IAQ participation

See Carrier TEMP or VVTt (Variable Volume and Temperature) literature for complete TEMP (single zone) or VVT (multi-zone) application information.

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 returnair thermistor located below the return-air damper in the returnair 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 default temperature of 55 F for the supply air. The supply-air temperature is measured by the supply-air thermistor, located 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 temperature as a set point

• support of remote occupied/unoccupied input to start or stop the unit

• provide power exhaust output to an external power exhaust 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 temperature set point during occupied periods

• control of one stage of heat to maintain supply air temperature at supply air set point during occupied periods

• provide a variable frequency drive high voltage relay output 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.

Features with Sensor Control of Unit (Network Applications) — The base control board provides, as standard, a connection 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 Comfort Works, Building Supervisor, or Service Tool, 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 communication bus. See Fig. 12. The timeclock has a 10-hour minimum back-up time to provide for unit power off for servicing unit

NOTE: On units running Version 1.0 of the Unit Control Software, the remote start/stop switch is connected to R and Y1. On units running Version 2.0 of the Unit Control Software, the remote start/stop switch is connected to R and W1.

Fig. 11 — Field Control Remote Start/Stop

Page 14

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).

Fig. 12 — Control Board Diagram

Page 15

For units running Version1.0 of the unit control software, network access software is required to enable occupied heating. For units running Version 2.0 of the unit control software, occupied heating is enabled or disabled by the position of DIP switch no. 5.

Additional features may be provided with electronic access 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 accessed 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 occupied 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

Aﬁeld-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 temperature sensor and a remote contact closure (remote start/ stop), the occupied default set points will monitor unit operation. 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 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 of 55 F (supply-air temperature) cooling and 68 F (return-air temperature) heating. Without

an occupancy schedule, the unit will control to the unoccupied default set points of 90 F (return air) cooling and 55 F (return air) heating (if electric heat is installed).

Features with Network Applications — 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 communication 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.

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 connections 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 (corner post next to control box).

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

LEGEND

Page 16

A31⁄2-in. NPT coupling for ﬁeld power wiring and a

⁄4-in. NPT coupling for 24-v control wiring are provided in basepan. In the side post, there are two 21⁄2-in. (024-034) or 3-in. (038-048) knockouts for the ﬁeld power wiring. See Fig. 3-6. If control wiring is to be brought in through the side of unit, a7⁄8-in. diameter hole is provided in the condenser 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 31⁄2-in. hole to the disconnect box and back into unit to the main control box.

Use strain relief going into control box through 2

⁄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

⁄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 terminal blocks (see Field Control Wiringsection on this page).

Install conduit connector in unit basepan or side panel openings provided. Route power and ground lines through connector 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 21⁄2-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- or 3-in. diameter hole provided. After wires are in unit

2 control box, connect to power terminal block (see Power Wiring section on page 15).

Bring low-voltage control wiring through factory-drilled

⁄8-in. diameter hole in condenser side post. Use strain relief

going into7⁄8-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 section on this page).

IMPORTANT: THE VAV (variable air volume) units incorporateVFD (variable frequency drives) which generate, 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, voltages 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 company immediately.

Unit failure as a result of operation on improper line voltage 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 Carrierapproved 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) according to the installation instructions included with the accessory 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 colored wire from subbase terminals to low-voltage connections as shown on unit label wiring diagram and in Fig. 16.

NOTE: For wire runs up to 50 ft, use no. 18 AWG (American Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft, use no. 16 AWG insulated wire (35 C minimum). For over 75 ft, use no. 14 AWG insulated wire (35 C minimum). All wire larger than no. 18 AWG cannot be directly connected to the thermostat and will require a junction box and splice at the thermostat.

Set heat anticipators settings to 0.1 for all voltages. Settings 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 occupied schedules, but unit will not provide unoccupied heating or cooling.

VAV Units — VAV units require a ﬁeld-supplied heat interlock 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.

Page 17

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

NOMINAL

UNIT

VOLTAGE

SIZE

(3 Ph 60 Hz)

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

024

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 formultimotor and combination load equipment (referto NEC Articles 430 and 440), theovercurrent protective device forthe 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%.

% Voltage Imbalance = 100 x EXAMPLE: Supply voltage is 460-3-60.

460 414 508 19.9 114 11.5 80 2 1 2.7

575 518 632 16.0 91 9.6 64 2 1 2.4

Use the following formula to determine the percent of voltage imbalance.

VOLTAGE

RANGE

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

LEGEND

max voltage deviation from average voltage

AB = 452 v BC = 464 v AC = 455 v

Average Voltage =

COMPRESSOR

No. 1 No. 2

average voltage

452 + 464 + 455

1371

= 457

OFM IFM

5 7.6

10 14

15 21

5 6.1

10 11

15 17

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. % Voltage Imbalance = 100 x

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).

POWER

EXHAUST

— — — — 101.8/100.3 125/125

23.6 41.6 — — 125.4/123.9 150/150

16.7/

— — 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

15.2 — — 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 — — — — 115.9/113.1 150/150

23.6 41.6 — — 139.5/136.7 175/175

30.8/

— — 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

28.0 — — 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 — — — — 131.3/127.1 150/150

23.6 41.6 — — 154.9/150.7 175/175

46.2/

— — 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

42.0 — — 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 — — — — 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 — — — — 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 — — — — 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 — — — — 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 — — — — 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 — — — — 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

= 1.53%

457

ELECTRIC

HEAT*

POWER SUPPLY

Page 18

UNIT SIZE

028

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

NOMINAL VOLTAGE

(3 Ph 60 Hz)

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

460 414 508 19.9 114 19.9 114 2 1 2.7

575 518 632 16.0 91 16.0 91 2 1 2.4

VOLTAGE

RANGE

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

COMPRESSOR

No. 1 No. 2

OFM IFM

24.2/

7.5

22.0

30.8/

28.0

46.2/

42.0

7.5 11

10 14

15 21

7.5 9

10 11

15 17

POWER

EXHAUST

— — — — 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 — — — — 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 — — — — 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 — — — — 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 — — — — 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 — — — — 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 — — — — 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 — — — — 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 — — — — 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

ELECTRIC

HEAT*

POWER SUPPLY

Page 19

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

NOMINAL

UNIT

VOLTAGE

SIZE

(3 Ph 60 Hz)

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

030

*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:

2. Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance in supply voltage is greater than 2%.

% Voltage Imbalance = 100 x EXAMPLE: Supply voltage is 460-3-60.

460 414 508 25.6 120 19.9 114 2 1 2.7

575 518 632 20.5 96 16.0 91 2 1 2.4

Use the following formula to determine the percent of voltage imbalance.

VOLTAGE

RANGE

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

LEGEND

max voltage deviation from average voltage

AB = 452 v BC = 464 v AC = 455 v

Average Voltage =

COMPRESSOR

No. 1 No. 2

average voltage

452 + 464 + 455

1371

= 457

OFM IFM

10 14

15 21

20 27

10 11

15 17

20 22

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. % Voltage Imbalance = 100 x

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).

POWER

EXHAUST

— — — — 151.9/149.1 200/200

23.6 41.6 — — 175.5/172.7 225/225

30.8/

— — 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

28.0 — — 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 — — — — 167.3/163.1 200/200

23.6 41.6 — — 190.9/186.7 225/225

46.2/

— — 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

42.0 — — 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 — — — — 180.5/175.1 225/225

23.6 41.6 — — 204.1/198.7 250/250

59.4/

— — 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

54.0 — — 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 — — — — 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 — — — — 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

− — — — 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 — — — — 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 — — — — 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 — — — — 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

= 1.53%

457

ELECTRIC

HEAT*

POWER SUPPLY

Page 20

UNIT SIZE

034

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

NOMINAL VOLTAGE

(3 Ph 60 Hz)

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

460 414 508 25.6 120 25.6 120 2 1 2.7

575 518 632 20.5 96 20.5 96 2 1 2.4

VOLTAGE

RANGE

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

COMPRESSOR

No. 1 No. 2

OFM IFM

30.8/

28.0

46.2/

42.0

59.4/

54.0

10 14

15 21

20 27

10 11

15 17

20 22

POWER

EXHAUST

— — — — 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 — — — — 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 — — — — 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 — — — — 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 — — — — 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 — — — — 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 — — — — 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 — — — — 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 — — — — 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

ELECTRIC

HEAT*

POWER SUPPLY

Page 21

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

NOMINAL

UNIT

VOLTAGE

SIZE

(3 Ph 60 Hz)

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

038

*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:

2. Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance in supply voltage is greater than 2%.

% Voltage Imbalance = 100 x EXAMPLE: Supply voltage is 460-3-60.

460 414 508 25.6 120 25.6 120 4 1 2.7

575 518 632 20.5 96 20.5 96 4 1 2.4

Use the following formula to determine the percent of voltage imbalance.

VOLTAGE

RANGE

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

LEGEND

max voltage deviation from average voltage

AB = 452 v BC = 464 v AC = 455 v

Average Voltage =

COMPRESSOR

No. 1 No. 2

average voltage

452 + 464 + 455

1371

= 457

OFM IFM

10 14

15 21

20 27

10 11

15 17

20 22

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. % Voltage Imbalance = 100 x

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).

POWER

EXHAUST

— — — — 180.5/177.7 225/225

23.6 41.6 — — 204.1/201.3 250/250

30.8/

— — 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

28.0 — — 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 — — — — 195.9/191.7 250/225

23.6 41.6 — — 219.5/215.3 275/250

46.2/

— — 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

42.0 — — 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 — — — — 209.1/203.7 250/250

23.6 41.6 — — 232.7/227.3 275/275

59.4/

— — 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

54.0 — — 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 — — — — 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 — — — — 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 — — — — 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 — — — — 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 — — — — 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 — — — — 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

= 1.53%

457

ELECTRIC

HEAT*

POWER SUPPLY

Page 22

UNIT SIZE

044

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

NOMINAL VOLTAGE

(3 Ph 60 Hz)

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

460 414 508 28.8 173 28.8 173 4 1 2.7

575 518 632 26.7 120 26.7 120 4 1 2.4

VOLTAGE

RANGE

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

COMPRESSOR

No. 1 No. 2

OFM IFM

46.2/

42.0

59.4/

54.0

74.8/

68.0

15 21

20 27

25 34

15 17

20 22

25 27

POWER

EXHAUST

— — — — 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 — — — — 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 — — — — 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 — — — — 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 — — — — 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

− — — — 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 — — — — 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 — — — — 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 — — — — 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

ELECTRIC

HEAT*

POWER SUPPLY

Page 23

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

NOMINAL

UNIT

VOLTAGE

SIZE

(3 Ph 60 Hz)

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

048

*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:

2. Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance in supply voltage is greater than 2%.

% Voltage Imbalance = 100 x EXAMPLE: Supply voltage is 460-3-60.

460 414 508 42.3 223 28.8 173 4 1 2.7

575 518 632 34.6 164 26.7 120 4 1 2.4

Use the following formula to determine the percent of voltage imbalance.

VOLTAGE

RANGE

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

LEGEND

max voltage deviation from average voltage

AB = 452 v BC = 464 v AC = 455 v

Average Voltage =

COMPRESSOR

No. 1 No. 2

average voltage

452 + 464 + 455

1371

= 457

OFM IFM

20 27

25 34

30 40

20 22

25 27

30 32

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. % Voltage Imbalance = 100 x

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).

POWER

EXHAUST

— — — — 252.4/247.0 300/300

23.6 41.6 — — 276.0/270.6 300/300

59.4/

— — 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

54.0 — — 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 — — — — 267.8/261.0 300/300

23.6 41.6 — — 291.4/284.6 300/300

74.8/

— — 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

68.0 — — 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 — — — — 281.0/273.0 300/300

23.6 41.6 — — 304.6/296.6 350/300

88.0/

— — 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

80.0 — — 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 — — — — 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 — — — — 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

− — — — 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 — — — — 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 — — — — 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 — — — — 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

= 1.53%

457

ELECTRIC

HEAT*

POWER SUPPLY

Page 24

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)

Page 25

NOTE: On units running Version 1.0 of theunit control software,the remote start/ stop switch is connected to R and Y1.

Conductors and drain wire must be 20 AWG minimum stranded, tinned copper. Individual conductors must be insulated with PVC, PVC/nylon, vinyl, Teﬂon, or polyethylene. 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 communication bus to a system element, use a color coding system for the entire network to simplify installation and checkout. See Table 6.

Fig. 16 — Field Control Thermostat Wiring

NOTE:Sensor part numbersare as follows:

T55 — HH51BX001 T56 — HH51BX004 T57 — CEC01215303-01

Fig. 17 — Field Control Temperature

Sensor Wiring

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 terminal marked CCN via a 3-wire bus.

IMPORTANT: Default bus address is 0. Default element number is 1. Refer to CCN literature for information on network addressing or changing CCN communication defaults.

Carrier Comfort Network Interface — The 50E units can be connected to the CCN. The communication bus wiring is supplied 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 connections for CCN should be made at the 3-pin plug (CCN located at the base board. Consult CCN literature for further information.

Table 6 — Color Code Recommendations

SIGNAL

TYPE

Positive (+) RED 1

Ground WHITE 2

Negative (−) BLACK 3

CCN BUS CONDUCTOR

INSULATION COLOR

CCN PLUG

PIN NO.

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 communication bus cables must be tied together. If the communication bus is entirely within one building, the resulting continuous shield must be connected to a ground at one point only.If the communication bus cable exits from one building and enters another, the shields must be connected to grounds at the lightning suppressor in each building where the cable enters or exits the building (one point per building only).

To connect the unit to the network:

1. Turn off power to the control box.

2. Cut the CCN wire and strip the ends of the red (+), 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 return duct limits access to economizer ﬁlters from below. Filter 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 economizer hood.

Page 26

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

⁄8-in. past the end

opposite the mounting ﬂange. See Fig. 18.

2. Assemble hood sides, top, and cross member with gasketed 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 members 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 mounting 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 mounting holes. Mount outdoor-airthermistor to enthalpy bracket (if purchased). Attach and wire enthalpy assembly. Place quick connects on enthalpy wires.

11. Remove screws along bottom of damper assembly. Locate and mount blockoff baffle using these screws.

12. Assemble 2 ﬁlter tracks side-by-side with the assembled 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.

TOP FLANGE

BLACK SEAL STRIP

HOOD SIDE

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)

MOUNTING FLANGE

HOOD SIDE

Fig. 20 — Adding Seal Strip to

Mounting Flange of Hood Sides

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 gasketed 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.

Page 27

HOOD SIDE

HOOD TOP

BLOCKOFF BAFFLE

Fig. 21 — Adding Seal Strip to

Hood Top Mounting Flange

GRAY FOAM STRIP

CROSS MEMBER

Fig. 22 — Adding Foam Strip to Cross Member

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

HOOD SIDE (SLOTTED)

HOOD TOP

Fig. 23 — Adding Foam Strip to Hood Side

MOUNTING ANGLE (WITH TABS)

Fig. 26 — Mounting Angle (With Tabs)

Attached to Filter Track Assembly

Page 28

Minimum Damper Position Setting — Setting of the outdoor 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 seconds 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 during 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 default value of the minimum outdoor air damper position is 20%. If the desired minimum position is 30%, allow the damper

BLACK SEAL STRIP (CENTERED)

FILTER COVER

position to go to 10% for 30 seconds, then 20% for 30 seconds, and when it reaches 30% close DIP switch no. 6 during 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 according 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).

Fig. 27 — Attaching Seal Strip

to Filter Cover

HH57AC077 ENTHALPY CONTROL

NOTE: Switches shown in high enthalpy state. Terminals 2 and 3 close on enthalpy decrease.

Fig. 29 — Wire Connections for Solid State

Enthalpy Control (HH57AC077)

CONTROL

CURVE

CONTROL POINT

(APPROX. DEG.)

A 73 (23) B 70 (21) C 67 (19) D 63 (17)

AT 50% RH

C7400A1004

HH57AC078 ENTHALPY SENSOR (USED WITH ENTHALPY CONTROL FOR DIFFERENTIAL ENTHALPY OPERATION)

Fig. 28 — Differential Enthalpy Control

and Sensor

RH — Relative Humidity

Fig. 30 — Psychrometric Chart for

Enthalpy Control

Page 29

Step 9 — Position Power Exhaust/Barometric ReliefDamper Hood —

been made and adjusted at the factory. The power exhaust blowers and barometric relief dampers are shipped assembled and tilted back into the unit for shipping. Brackets and extra screws are shipped in shrink wrap around the dampers. 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.

All electrical connections have

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 (VAVinverter pressure transducer) is located behind the ﬁlter access door on the lower inner panel. See Fig. 32. A section of

⁄4-in. plastic tubing must be run from the high-pressure tap on the differential pressure switch and connected to a tap in the supply-air duct. The tap is usually located

⁄3of 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 pressure transducer) is located behind the ﬁlter access door on the inner panel. See Fig. 32. A section of1⁄4-in. plastic tubing must be run from the high-pressure tap on the differential 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

Page 30

VAV — Variable Air Volume

Fig. 32 — Pressure Transducer Locations

Step10 — InstallAccessories — After all the factory-

installed options have been adjusted, install all ﬁeldinstalled accessories. Refer to the accessory installation instructions included with each accessory.

MOTORMASTERt III SENSOR LOCATION — Motormaster III sensor locations are shown in Fig. 33A-33C. Refer to the Motormaster III installation instructions for wiring and installation information.

Fig. 33A — Motormaster III Sensor Location

(Sizes 024-034)

Page 31

Fig. 33B — MotormasterT III Sensor Location

(Sizes 038 and 044)

Fig. 33C — Motormaster III Sensor Location

(Size 048)

Page 32

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 applicable codes.

CompressorMounting — 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 compressor 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 liquid line valve and one on the compressor discharge valve. Be sure that caps on the ports are tight.

VariableFrequencyDrive (VFD) — The variable fre-

quency drives are factory set. These settings include factoryinstalled 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. Locate 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 following 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 powered 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 adjust 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 powered 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)

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

VOLTAGE

(vdc)

VFD

SET POINT

NOTE: Terminal strip is located inside the VFD (Variable Frequency Drive) at the bottom.

Fig. 34 — VFD Factory-Installed Jumpers

Page 33

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 singlestage 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 sequencer system. This system consists of a model R353 signal 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 factoryinstalled hose at the ‘‘Lo’’ connection leads to atmosphere, and a ﬁeld-supplied hose must be connected to the ‘‘Hi’’connection 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 modules 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 controls. 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, always 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 order 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 connections 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 indication 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 adjusts 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 offset 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)

−0.50 2

−0.25 4

0.00 6

0.25 8

0.50 10

SIGNAL LEVEL

(vdc)

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 exhaust are shown in Table 9.

Table 9 — Power Exhaust Default Set Points

STAGE OFFSET

1 50% 3% 6.0 6.3 0.00 2 55% 3% 6.5 6.8 0.06 3 60% 3% 7.0 7.3 0.12 4 64% 3% 7.4 7.7 0.18

DIFFE-

RENTIAL

OFF

VOLTAGEONVOLTAGE

OFF

STATIC

PRESSURE

(in. wg)

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 calibrated in 1% increments, and is factory set at approximately 3%. It is recommended to leave the set point at 3%, to minimize cycling of the fans.

The offset and differential potentioments have been factory set for atmosphereic pressure. Do not change these settings 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 Conﬁguration —

conﬁgured for each application. The DDC board is conﬁgured through the DIP switches located on the board. There are 8 DIP switches which conﬁgure 8 different applications of the DDC. See Tables10Aand 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.

The Direct Digital Control (DDC) board must be

Page 34

Table 10A — DIP Switch Conﬁguration (Version 1.0 of Unit Control Software)

SETTING 1 2 3 4 5 6 7 8

OPEN VAV

CLOSED CV TSTAT

LEGEND

CCN — Carrier Comfort Network CV — Constant Volume I/O — Input/Output POS. — Position TSTAT — Thermostat VAV — Variable Air Volume

CCN/

Sensors

Expansion

I/O Board

Base Board

Only

Field Test

OFF

Modulated

Power

Exhaust

Power

Exhaust

Time Guard Override

ON/ Set Min.

Damper Pos. ON

Time Guard Override

OFF/ Set Min.

Damper Pos. OFF

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.

Gas Heat Factory Test ON

Electric Heat Factory Test OFF

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

SETTING 1 2 3 4 5 6 7 8

VAV — Space Sensor

Installed

OPEN VAV

CV — CCN or Sensors

VAV — No Space Sensor

CLOSED CV

LEGEND

CCN — Carrier Comfort Network CV — Constant Volume VAV — Variable Air Volume

Used

CV — Thermostat

Expansion

Board

Base Control

Board Only

Field Test

OFF

VAV —

Occupied

Heat

Enabled

CV —

Modulated

Power

Exhaust

VAV —

Occupied

Heat

Disabled

CV —

Constant

Volume

Power

Exhaust 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 (VAVoperation), 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.

Time Guard Override

IN CONJUNCTION WITH FIELD TEST

— Set Minimum Damper Position

OFF

Gas Heat

Electric Heat

Heat Pump

Operation

Air Conditioner

Operation

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

Page 35

DIPswitch conﬁgurations for Version1.0 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 thermostats are used with the unit

• DIP switch 3 conﬁgures the DDC for use with the electronic 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 Guardt override and the minimum damper position

• DIP switch 7 conﬁgures the unit for gas heat or electric heat

• DIP switch 8 is used to factory test the unit

The DIP switch conﬁgurations for Version 2.0 of the unit

control software are as follows:

• 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 electronic expansion board

• DIP switch 4 is used to ﬁeld test the unit

• DIP switch 5 is used to enable occupied heating (V AV 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 conditioner operation

CrankcaseHeater(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.

EvaporatorFan — 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 direction. Static pressure drop for power exhaust, barometric relief damper, and electric heat is negligible. To alter fan performance, see Evaporator Fan Performance Adjustment section 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 without 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 sliding 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 removal tool to remove the remaining ﬁlters.

Outdoor-AirInlet 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 Sequence of Operation and Make Outdoor Air Inlet Adjustments 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, DIP switch no. 2 is read to determine if the control is TSTAT or sensor type operation. The initialization sequence: clears all alarms and alerts; re-maps the input/output database for CV operation; 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 functions control stages: cool1, cool2, heat1, heat2, and the indoor 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 selected. Use of the space temperature offset input can also be conﬁgured. The control module will set appropriate operating mode and fan control. The control module will turn on indoor fan if in Occupied mode or if the unit is in Unoccupied mode and the space temperature is outside of the unoccupied comfort set points (Unoccupied Heat or Unoccupied 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 Occupied 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.

Page 36

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)

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)

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 — — — — — —

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

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

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

AIRFLOW

(Cfm)

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 ——————

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

3.4 3.6 3.8

Rpm Bhp Rpm Bhp Rpm Bhp

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: Watts =

3. VAV units will operate down to 70 cfm/ton.

Bhp x 746

Motor efficiency

Page 37

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)

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)

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 — — — — — — — — — — — —

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

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

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

AIRFLOW

(Cfm)

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 ——————

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

3.4 3.6 3.8

Rpm Bhp Rpm Bhp Rpm Bhp

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: Watts =

3. VAV units will operate down to 70 cfm/ton.

Bhp x 746

Motor efficiency

Page 38

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

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

AIRFLOW

(Cfm)

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)

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)

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 ——————

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

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

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

3.4 3.6 3.6

Rpm Bhp Rpm Bhp Rpm Bhp

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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: Watts =

3. VAV units will operate down to 70 cfm/ton.

Bhp x 746

Motor efficiency

UNIT

50EJ,EK,EW,EY

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

MINIMUM HEATING

CFM

Table 15 — Air Quantity Limits

MINIMUM COOLING

CFM (VAV)

MINIMUM COOLING

CFM (CV)

MAXIMUM

CFM

Page 39

STANDARD EFFICIENCY MOTORS Nominal

7.5

Maximum

Bhp

5.9 17.94 16.99 — — 5,348 82.3

5.9 — — 8.50 5.78 5,240 84.0

8.7 25.52 24.36 — — 7,717 84.1

9.5 — — 13.30 9.63 8,549 82.9

10.2 26.93 25.50 — — 8,879 85.7

11.8 — — 14.75 11.33 10,284 85.6

15.3 42.84 40.80 — — 13,686 83.4

18.0 — — 24.00 18.00 15,891 84.5

22.4 59.36 56.00 — — 19,032 87.8

23.4 — — 29.25 22.82 19,950 87.5

28.9 76.30 72.83 — — 24,499 88.0

29.4 — — 37.04 28.69 25,181 87.1

35.6 92.56 87.81 — — 29,378 90.4

34.7 — — 42.80 n/a 29,316 88.3

Table 16 — Motor Limitations

Maximum Amps

208 230 460 575

Maximum

Watts

Motor

Efficiency

HIGH EFFICIENCY MOTORS Nominal

7.5

LEGEND

BHP — Brake Horsepower

Maximum

Bhp

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

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

10.2 28.56 24.89 — — 8,502 89.5

11.8 — — 14.40 — 9,836 89.5

11.8 — — — 11.68 9,600 91.0

15.3 45.08 39.17 — — 12,543 91.0

18.0 — — 23.04 — 14,756 91.0

18.0 — — — 18.12 14,439 93.0

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

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

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

208 230 460 575

Maximum Amps

Maximum

Watts

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 Limitations table will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.

Motor

Efficiency

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

CV — Constant Volume IAQ — Indoor Air Quality OAT — Outdoor Air Temperature

LEGEND

Page 40

The control module will operate economizer, run diagnostics 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-airtemperature broadcast and global occupancy broadcast. When the optional expansion I/O board is employed, it will: perform a periodic scan and maintain a database of expanded I/O points; perform Fire/Smoke control (power exhaust 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 thermostats are used to deenergize the G input, the control module will turn offthe indoor fan without delay and close the economizer dampers.

When cooling, G must be energized before cooling can operate. The control module determines if outdoor conditions 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 (default is 65 F); the SAT (supply-air temperature) thermistor must not be in alarm; and the outdoor air reading is available. When these conditions are satisﬁed, the control module will use economizer as the ﬁrst stage of cooling.

WhenY1 input is energized, the economizer will be modulated 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, compressor 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 cooling, the economizer will go to minimum position and cycle compressors 1 and 2 based on demand from Y1 and Y2 respectively.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 Guardt function maintains a minimum off time of 5 minutes, a minimum on time of 10 seconds, and a minimum delay before starting the second compressor of 10 seconds.

When heating, the heat stages respond to the demand from W1 and W2 of the thermostat input. Heating and cooling will be mutually locked-out on demand on a ﬁrst call basis. The heating and the cooling functions cannot operate simultaneously.

COOLING, VARIABLE VOLUME UNITS — On power up, the control module will activate the initialization software. The initialization software reads DIP switch no. 1 position to determine CV or VAV operation. The initialization sequence: 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 (linkage) 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 controlled 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 temperature) 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 compensated start algorithm. When the VFD is running in a normal 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 available when enabled through software.

When cooling, the control module will energize the power exhaust enable output to the external power exhaust controller (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 (Product Outboard Control) functions such as time/outdoor air temperature 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 controlled with a room sensor, the fan will run continuously in the Occupied mode, with the outside-air damper in the minimum position. If the unit is controlled through a room thermostat (with FANset 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 position. 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 will deenergize. The indoor-fan motor will also deenergize (unless 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 twostage 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 Occupied modes), power is sent from the control module to energize the ﬁrst stage of electric heat. A ﬁeld-supplied heat

Page 41

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 indoorfan 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 motor will deenergize and the outdoor-air damper will move to the closed position (if open).

MORNINGWARM-UP (VA VONLYWITH 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. Morning 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 heating. 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 occupied heating is disabled. When the heating demand is satisﬁed, the warm-up condition will terminate. To increase or decrease the heating demand, use the network access software to change the occupied heating set point.

NOTE: To utilize morning warm-up mode, the unit occupancy schedule must be accessed via Service Tool, Comfort Works, or Building Supervisor software (units running Version 1.0 of unit control software).

MORNINGWARM-UP (VAV ONLYWITH STAND-ALONE OPERATION) — When a unit running version 2.0 of the unit control software operates in stand-alone mode, morning warm-up occurs when the unit is energized in Occupied mode and return-air temperature (RAT) is below 68 F. Warm-up will not terminate until the RAT reaches 68 F. The heat interlock relay output is energized during morning warm-up. (Aﬁeld-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 accessory space temperature sensor is required. Space temperature 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 temperature falls below the cool set point, the supply-air temperature will be reset upward as a function of the reset ratio. Reset 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 operation 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 offeredwith constant 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 Supervisor, or Comfort Works).

Fig. 35 — Heat Interlock Relay Wiring

Fig. 36 — Space Temperature Sensor Wiring

Page 42

CAPACITY CONTROL, COOLING — The cooling capacity staging tables are shown in Tables 18 and 19.

Table 18 — Cooling Capacity Staging Table

CV Units with 2 Compressors

STAGES 0

Compressor 1 Off Off On On Compressor 2 Off Off Off On

NOTE:OnCVunitsthatrequire additional unloading, add suction pressure unloaders on Compressor 1 only.

ECONOMIZER

MOTORMASTERt III DEVICE — The Motormaster III Solid-State Head Pressure Control is a ﬁeld-installed accessory,fan speed control device actuated by a temperature sensor. The Motormaster III device is speciﬁcally designed for use on Carrier equipment and controls the outdoor-fan motor speed in response to the saturated condensing temperature. For outdoor temperatures down to −20 F, the Motormaster III device maintains condensing temperature at 100 F.

SERVICE

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 moving up DIP switch no. 4 to the OPEN position. The outdoorair 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 outsideair damper will begin to open to its default value of 20% and stay at that position for a short period of time. The outdoorair 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 GUARDt CIRCUIT — TheTimeGuard function (built

into the rooftop’s control module board) maintains a minimum 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 crankcase heater in each compressor keeps oil free of refrigerant while compressor is off.

HEAD PRESSURE CONTROL — Each unit has a fan cycling, outdoor thermostat to shut off outdoor-fan motor(s) at 55 F (one outdoor-fan motor on 024-034 units and 2 outdoorfan motors on 038-048 units). The head pressure control permits the unit to operate with correct condensing temperatures down to 35 F outdoor-air temperature.

Before performing service or maintenance operations on unit, turn off main power switch to unit. Turn off accessory heater power switch if applicable. Electrical shock could cause personal injury.

ServiceAccess — 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 See Fig. 37.

To open, loosen the latch bolt using a 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 replacement 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

⁄4-in.-20x1⁄2-in. long bolt.

⁄16-in. wrench. Pivot

Page 43

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 commercial 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 require. 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 throwaway 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 between1⁄4and1⁄3of sight glass during steady operation.

If oil charge is above 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

⁄3sight glass, do not remove any oil

CONDENSERAND EVAPORATOR-FAN MOTOR BEARINGS — The condenser and evaporator-fan motors have permanently-sealed bearings, so no ﬁeld lubrication is necessary.

Evaporator Fan Performance Adjustment (Fig. 38) —

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 mounting plate.

5. Retighten pulley. IMPORTANT: Check to ensure that the unit drive

matches the duct static pressure in Tables 12 to 14.

Fan motor pulleys are factory set for speed

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.

IMPORTANT: Do not use reclaimed oil or oil that has been exposed to the atmosphere. Refer to Carrier Standard Service Techniques Manual, Chapter 1, Refrigerants 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.

Fig. 38 — Evaporator-Fan Pulley Alignment

and Adjustment

Page 44

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 remove 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 allow 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.

PowerFailure — 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 Reclamation 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 refrigerant (refer to Table 1).

LOW CHARGE COOLING — Using appropriate cooling charging chart (see Fig. 41 and 42), add or remove refrigerant 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 service 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 affect reading. Indoor-air cfm must be within normal operating range of unit. Takeoutdoor ambient temperature and read the suction pressure gage. Refer to appropriate chart to determine 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.

Fig. 39 — Belt Tension Adjustment

Fig. 40 — Condenser-Fan Adjustment

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 maintain 10 to 13° F superheat leaving the evaporator coil. Controls 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 connections 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 excessively high discharge gas temperatures.

Page 45

Crankcase Heater — Each compressor has a crankcase heater to prevent absorption of liquid refrigerant by oil in the crankcase when the compressor is idle. Since power for the crankcase 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 service job, energize the crankcase heaters for 24 hours before starting the compressors.

EVAPORATOR-FAN MOTOR PROTECTION — A manual reset, calibrated trip, magnetic circuit breaker protects against overcurrent. Do not bypass connections or increase the size of the breaker to correct trouble. Determine the cause and correct it before resetting the breaker. If the evaporatorfan motor is replaced with a different horsepower motor, resizing of the circuit breaker is required. Contact Carrier Application 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 activates, 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 offthe 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 control 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

Page 46

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)

Page 47

LEGEND

FPS — Freeze Protection Switch HPS — High-Pressure Switch LPS — Low-Pressure Switch

Fig. 44 — Typical Refrigerant Circuiting

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

Page 48

LEGEND

FPS — Freeze Protection Switch HPS — High-Pressure Switch LPS — Low-Pressure Switch

Fig. 45 — Typical Refrigerant Circuiting

(50EJ,EW048)

Page 49

DiagnosticLEDs (Light-Emitting Diodes) — There

are 3 LEDs (red, yellow, and green) on the lower right hand side of the control board. The red light is used to check unit operation and alarms. A constant pulse is normal unit operation. A series of quick blinks indicates an alarm. Refer

Table 20 — Control Board LED Alarms

to Table 20 below for a description of alarms. The yellow LED blinks during transmission with the CCN (Carrier Comfort Network). The green LED blinks during transmission with the expansion board.

LED

BLINKS

1 Normal Operation The expansion board and control board ﬂash the red LED in one- 2 HF-13 Compressor 1 Safety The high or low pressure safety switch for compressor no. 1 has

3 HF-14 Compressor 2 Safety The high or low pressure safety switch for compressor no. 2 has

4 HF-15 Thermostat Failure The thermostat is calling for both heating and cooling at the

5 HF-05 SAT Thermistor Failure The supply-air temperature (SAT) sensor has failed. First check for 6 HF-06 OAT Thermistor Failure The outside-air temperature (OAT) sensor has failed. First check 7 HF-03 Space Temp. Sen. Failure The space temperature sensor has failed. First check for wiring 8 HF-12 RAT Thermistor Failure The return-air temperature (RAT) sensor has failed. Ensure that

9 SE-05 Loss of Communications

10 HF-16 Control Board Failure Generated when hardware has failed on control board. Replace 11 HF-17 Expansion Board Failure Generated when hardware has failed on the expansion board.

LEGEND

DIP — Dual In-Line Package LED — Light-Emitting Diode VAV — VariableAir Volume

ERROR

CODE

DESCRIPTION

with Expansion board

TROUBLESHOOTING

COMMENTS

second intervals when the board is operating properly. 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.

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.

same time. The unit will operate on a ﬁrst call basis and will automatically reset.

wiring errors, then replace sensor. for wiring errors, then replace sensor. errors, then replace sensor. 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.

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.

the control board. Replace the expansion board.

Page 50

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

Table 21 — I/O Channel Designations

Base Module — CV

TERMINAL

NO.

T1-2 SPT (CCN) — 10KV Thermistor T3-4 STO (CCN) — 10KV Thermistor T5-6 OAT — 5KV Thermistor T7-8 SAT — 5KV Thermistor 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 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)

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

CV Power Exhaust 1/Modulating Pwr Exht — DO (115 vac)

LEGEND

(Tables 21 and 22)

ASSIGNMENT

Table 22 — I/O Channel Designations

Base Module — VAV

TERMINAL

NO.

T1-2 SPT (CCN) — 10KV Thermistor T3-4 RAT — 5KV Thermistor T5-6 OAT — 5KV Thermistor T7-8 SAT — 5KV Thermistor 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)

ASSIGNMENT

Page 51

Table 23 — I/O Channel Designations Expansion

Module — CV and VAV

TERMINAL

NO.

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

ASSIGNMENT

Page 52

Page 53

Page 54

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

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.

• Maintenance

• Operating Sequence

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

Page 55

START-UP CHECKLIST

MODEL NO.: SOFTWARE VERSION (SEE FIG. 15) DATE:

SERIAL NO.: TECHNICIAN:

PRE-START-UP:

M VERIFY THAT DIP SWITCH SETTINGS ARE CORRECT M VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT M REMOVE ALL SHIPPING HOLDDOWN BOLTS AND BRACKETS PER INSTRUCTIONS M VERIFY INSTALLATION OF ECONOMIZER HOOD M VERIFY INSTALLATION OF ALL OPTIONS AND ACCESSORIES M VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS M VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT M CHECK THAT INDOOR-AIR FILTER IS CLEAN AND IN PLACE M VERIFY THAT UNIT IS LEVEL WITHIN TOLERANCES M CHECK FAN WHEELS AND PROPELLERS FOR LOCATION IN HOUSING/ORIFICE, AND VERIFY SET SCREW

IS TIGHT

M VERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED M VERIFY THAT SUCTION, DISCHARGE, AND LIQUID LINE SERVICE VALVES ON EACH CIRCUIT ARE OPEN

START-UP

ELECTRICAL

SUPPLY VOLTAGE L1-L2 L2-L3 L3-L1

COMPRESSOR AMPS — COMPRESSOR NO. 1 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

M VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS ON PAGE 45

CL-1

Page 56

START-UP CHECKLIST (cont)

GENERAL

M ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS M ENSURE DRIVES OPERATE WITHIN LIMITS OF FAN PERFORMANCE TABLES

HIGH-PRESSURE SWITCH SETTING LOW-PRESSURE SWITCH SETTING MOTOR PULLEY PART NUMBER FAN PULLEY PART NUMBER BELT PART NUMBER BELT SIZE in. FILTER QUANTITY FILTER SIZES in.

ADDITIONAL NOTES:

PSIG

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

CUT ALONG DOTTED LINE CUT ALONG DOTTED LINE

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Carrier 50EW, 50EY, 50EJ, 50EK User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual