Carrier 48EJ, EY024-048 User Manual

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 ..................2

• POSITIONING

• ROOF MOUNT

Step 3 — Field Fabricate Ductwork ............2

Step 4 — Install Flue Hood ..................12

Step5—TrapCondensate Drain ............13

Step 6 — Install Gas Piping ..................13

Step 7 — Controls Options ..................13

• CONSTANT VOLUME APPLICATIONS

• VARIABLE AIR VOLUME (VAV) APPLICATIONS

Step 8 — Make Electrical Connections .......16

• POWER WIRING

• FIELD POWER SUPPLY

• FIELD CONTROL WIRING

Step 9 — Make Outdoor-Air Inlet

Adjustments ...............................24

• ECONOMIZER

• ECONOMIZER SETTINGS

Step 10 — Position Power Exhaust/Barometric

Relief Hood ...............................29

Step 11 — Install All Accessories ............30

START-UP ................................31-44

SERVICE ..................................44-55

TROUBLESHOOTING ......................56-61

START-UP CHECKLIST ................CL-1,CL-2

48EJ,EK,EW,EY024-048

Single Package Rooftop Units

Electric Cooling/Gas Heating

1. Improper installation, adjustment, alteration, serv­ice, or maintenance can cause property damage, per­sonal injury, or loss of life. Refer to the User’s
Information Manual provided with this unit for more
details.

2. Do not store or use gasoline or other flammable va­pors and liquids in the vicinity of this or any other
appliance.

What to do if you smell gas:

1. DO NOT try to light any appliance.

2. DO NOT touch any electrical switch, or use any phone
in your building.

3. IMMEDIATELY call your gas supplier from a neigh­bor’s phone. Follow the gas supplier’s instructions.

4. If you cannot reach your gas supplier, call the fire
department.

Disconnect gas piping from unit when pressure testing
at pressure greater than 0.5 psig. Pressures greater than

0.5 psig will cause gas valve damage resulting in haz-

ardous condition. If gas valve is subjected to pressure
greater than 0.5 psig, it must be replaced before use. When
pressure testing field-supplied gas piping at pressures of

0.5 psig or less, a unit connected to such piping must be

isolated by closing the manual gas valve(s).

INSTALLATION

Step 1 — Provide Unit Support

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical com­ponents. Only trained andqualifiedservice personnel should
install, repair, or service air-conditioning equipment.

Untrained personnel can perform the 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. Wearsafety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire ex­tinguishers available for all brazing operations.

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

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

Book 1
Tab 1a

PC 111 Catalog No. 564-962 Printed in U.S.A. Form 48E-5SI Pg 1 8-97 Replaces: 48E-3SI

1. All panels must be in place when rigging.

2. Unit is not designed for handling by fork truck.

ROOF CURB — Assemble or install accessory roof curb in
accordance with instructions shipped with this accessory.See
Fig. 1 and 2. Install insulation, cant strips, roofing, and counter
flashing as shown. Ductwork can be installed to roof curb
before unit is set in place. 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.

IMPORTANT: The gasketing of the unit to the roof
curb is critical for a watertight seal. Install gasket with
the roof curb as shown in Fig. 1 and 2. Improperly
applied gasket can also result in air leaks and poor unit
performance.

ALTERNATE UNIT SUPPORT— When the preferred curb
or slab mount cannot be used, support unit with sleepers on
perimeter, using unit curb support area. If sleepers cannot be
used, support long sides of unit (refer to Fig. 3-6) with a
minimum number of 4-in. x 4-in. pads spaced as follows:
48EJ,EK,EW,EY024-034 units require 3 pads on each side;
48EJ,EK,EW,EY038-048 units require 4 pads on each side.
Unit may sag if supported by corners only.

Step 2 — Rig and Place Unit — Inspect unit for trans-

portation damage. File any claim with transportation agency.

Do not drop unit; keep upright. Use spreader bars over
unit to prevent sling or cable damage. Level by using unit
frame as a reference; leveling tolerance is shown in Fig. 1
and 2. See Fig. 7 for additional information. Unit operating
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 old 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 — Maintain clearance, per Fig. 3-6, around
and above unit to provide minimum distance from combus­tible materials, proper airflow, and service access.

Do not install unit in an indoor location. Do not locate
unit air inlets near exhaust vents or other sources of con­taminated air. For proper unit operation, adequate combus­tion and ventilation air must be provided in accordance with
Section 5.3 (Air for Combustion and Ventilation) of the
National Fuel Gas Code, ANSI Z223.1 (American National
Standards Institute).

Although unit is weatherproof, guard against water from
higher level runoff and overhangs.

Locate mechanical draft system flue assembly at least
4 ft from any opening through which combustion products
could enter the building, and at least 4 ft from any adjacent
building. When unit is located adjacent to public walkways,
flue assembly must be at least 7 ft above grade.

ROOF MOUNT — Check building codes for weight distri­bution requirements. Unit weight is shown in Table 1.

Step 3 — Field Fabricate Ductwork

48EJ,EK UNITS — Field-fabricated ductwork should be at­tached to the roof curb. Supply and return duct dimensions
are shown in Fig. 3 and 4. Air distribution is shown in
Fig. 8.

To attach ductwork to roof curb, insert duct approxi­mately 10 to 11 in. up into roof curb. Connect ductwork to
14-gage roof curb material with sheet metal screws driven
from inside the duct.

Secure all ducts to the building structure, using flexible
duct connectors between roof curb and ducts as required. Ducts
passing through an unoccupied space must be insulated and
covered with a vapor barrier. Outlet grilles must not lie
directly below unit discharge. The return duct must have a
90-degree elbow before opening into the building space if
the unit is equipped with power exhaust.

For vertical supply and return units, tools or parts could
drop into ductwork and cause an injury. Install 90 de­gree elbow turns in the supply and return ductwork be­tween the unit and the conditioned space. If a 90 degree
elbow cannot be installed, then grilles of sufficientstrength
and density should be installed to prevent objects from
falling into the conditioned space.

48EW,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. Insulate and weatherproof all external
ductwork, joints, and building 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.

Install accesssory barometric relief or power exhaust in
the field-fabricated return ductwork. Refer to Position Power
Exhaust/Barometric Relief Damper Hood section on
page 26 for more information.

Instructions continued on page 12.

2

NOTES:

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

2. Dimensions are in inches.

3. Toprevent standing water in the drain pan of the indoor
sectionandtheheatexchangers,unit can only be pitched
as shown.

Fig. 1 — Roof Curb (Sizes 024-034)

UNIT LEVELING TOLERANCES DIMENSIONS*

*From edge of unit to horizontal.

(Degrees and Inches)

AB

Deg. in. Deg. in.

1.0 2.9 .50 .75

3

NOTES:

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

2. Dimensions are in inches.

3. Toprevent standing water in the drain pan of the indoor
sectionandtheheatexchangers,unit can only be pitched
as shown.

Fig. 2 — Roof Curb (Sizes 038-048)

UNIT LEVELING TOLERANCES DIMENSIONS*

*From edge of unit to horizontal.

(Degrees and Inches)

AB

Deg. in. Deg. in.

1.0 2.9 .50 .75

4

VFD — Variable Frequency Drive
NOTES:

1. Weights include economizer (STD).

2. Center of gravity.

3. Do not locate adjacent units with flue dis­chargefacingeconomizerinlet.Minimum clear­ances to be:

Adjacent Units: 158-09
Top of Units: No overhang
Condenser Coil: 48-09
Economizer Side: 68-09
Gas Heat Side: 48-09
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 mounted on dun­nage, it is recommended the ducts be
supported by cross braces as done on ac­cessory roof curb.

6. Dimensions are in inches.

UNIT
SIZE

OPERATING

WEIGHT

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

48EJ,EKD024 4176 6- 0

48EJE024 4256 6- 1

48EJ,EKD028 4262 5- 9

48EJE028 4342 5-10

48EJ,EKD030 4262 5- 9

48EJE030 4342 5-10

48EJ,EKD034 4262 5- 9

48EJE034 4342 5-10

A B CORNER WEIGHT (lb)

3

⁄83-63⁄8879 954 1220 1124

5

⁄163-611⁄16917 973 1218 1148

5

⁄83-8 899 899 1232 1232

1

⁄83-85⁄16929 916 1240 1257

5

⁄83-8 899 899 1232 1232

1

⁄83-85⁄16929 916 1240 1257

5

⁄83-8 899 899 1232 1232

1

⁄83-85⁄16929 916 1240 1257

Fig. 3 — Base Unit Dimensions, 48EJ,EK024-034

5

VFD — Variable Frequency Drive
NOTES:

1. Weights include economizer (STD).

2. Center of gravity.

3. Do not locate adjacent units with flue 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
Gas Heat Side: 48-09
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 mounted on dunnage, it is recommended the ducts be
supported by cross braces as done on accessory roof curb.

6. Dimensions are in inches.

Fig. 4 — Base Unit Dimensions, 48EJ,EK038-048

UNIT
SIZE

OPERATING

WEIGHT

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

48EJ,EKD038 4442 7- 8

48EJE038 4602 7-10

48EJ,EKD044 4668 7- 5

48EJE044 4828 7- 6

48EJ,EKD048 4955 7- 3

48EJE048 5115 7- 5

6

A B CORNER WEIGHT (lb)

11

⁄163-107⁄81021 894 1180 1347

1

⁄83-113⁄161080 934 1200 1388

5

⁄163-107⁄81033 906 1275 1455

13

⁄163-113⁄161094 945 1293 1496

11

⁄163-101⁄21068 953 1384 1550

3

⁄163-1013⁄161129 994 1401 1592

VFD — Variable Frequency Drive
NOTES:

1. Weights include economizer (STD).

2. Center of gravity.

3. Do not locate adjacent units with flue 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
Gas Heat Side: 48-09
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.

6. 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, 48EW,EY024-034

UNIT
SIZE

OPERATING

WEIGHT

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

48EW,EYD024 4176 6- 0

48EWE024 4256 6- 1

48EW,EYD028 4262 5- 9

48EWE028 4342 5-10

48EW,EYD030 4262 5- 9

48EWE030 4342 5-10

48EW,EYD034 4262 5- 9

48EWE034 4342 5-10

7

A B CORNER WEIGHT (lb)

3

⁄83-63⁄8879 954 1220 1124

5

⁄163-611⁄16917 973 1218 1148

5

⁄83-8 899 899 1232 1232

1

⁄83-85⁄16929 916 1240 1257

5

⁄83-8 899 899 1232 1232

1

⁄83-85⁄16929 916 1240 1257

5

⁄83-8 899 899 1232 1232

1

⁄83-85⁄16929 916 1240 1257

VFD — Variable Frequency Drive
NOTES:

1. Weights include economizer (STD).

2. Center of gravity.

3. Do not locate adjacent units with flue 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
Gas Heat Side: 48-09
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.

6. For side-supply/return applications, a single return and supply duct­work connection is recommended for covering both return and both
supply openings.

Fig. 6 — Base Unit Dimensions, 48EW,EY038-048

UNIT
SIZE

OPERATING

WEIGHT

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

48EW,EYD038 4442 7- 8

48EWE038 4602 7-10

48EW,EYD044 4668 7- 5

48EWE044 4828 7- 6

48EW,EYD048 4955 7- 3

48EWE048 5115 7- 5

8

A B CORNER WEIGHT (lb)

11

⁄163-107⁄81021 894 1180 1347

1

⁄83-113⁄

5

⁄163-107⁄81033 906 1275 1455

13

⁄163-113⁄

11

⁄163-101⁄21068 953 1384 1550

3

⁄163-1013⁄161129 994 1401 1592

16

1080 934 1200 1388

16

1094 945 1293 1496

UNIT

48EJ,EK,EW,EYD024 4176 1894

48EJ,EWE024 4256 1930 73.3 1862 42.7 1085

48EJ,EK,EW,EYD028

48EJ,EK,EW,EYD034

48EJ,EWE028

48EJ,EWE034

48EJ,EK,EW,EYD038 4442 2015

48EJ,EWE038 4602 2087 94.1 2390 47.2 1199

48EJ,EK,EW,EYD044 4668 2117 89.3 2268 46.9 1191

48EJ,EWE044 4828 2190 90.8 2306 47.2 1199

48EJ,EK,EW,EYD048 4955 2248 87.7 2228 46.5 1181

48EJ,EWE048 5115 2320 89.2 2266 46.8 1189

WEIGHT A B C

lb kg in. mm in. mm in. mm

72.4 1839 42.4 1072

4262 1933 69.6 1768 44.0 111848EJ,EK,EW,EYD030

4342 1969 70.1 1781 44.3 112548EJ,EWE030

87.68 2227

92.7 2355 46.9 1191

150 3810

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).

Fig. 7 — Rigging Label

9

Table 1 — Physical Data

UNIT 48EJ,EK,EW,EY 024D/E 028D/E 030D/E 034D/E
NOMINAL CAPACITY (tons) 20 25 27 30
OPERATING WEIGHT (lb)*

Unit

Al/Al† (Lo Heat/Hi Heat) 4176/4256 4262/4342 4262/4342 4262/4342
Al/Cu† (Lo Heat/Hi Heat) 4396/4476 4482/4562 4482/4562 4482/4562
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) (Ckt 1, 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 (Standard) S184T S215T D254T S213T S215T D254T S215T D254T S256T S215T D254T S256T

Motor Bearing Type Ball Ball Ball Ball
Maximum Allowable Rpm 1200 1200 1200 1200
Motor Pulley Pitch Diameter 4.8 4.4 5.7 5.4 6.1 5.5 4.4 4.9 5.9 4.4 5.7 5.9
Nominal Motor Shaft Diameter (in.) 1
Fan Pulley Pitch Diameter (in.) 12.4 8.6 9.1 12.4 11.1 8.7 9.4 8.1 8.7 9.0 9.1 8.7
Nominal Fan Shaft Diameter (in.) 1
Belt, Quantity...Type
Belt, Length (in.)
Pulley Center Line Distance (in.) 16.0-18.7 15.6-18.4 15.0-17.9 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) 717 924 1096 773 962 1106 848 1059 1187 884 1096 1187

FURNACE SECTION

Rollout Switch Cutout Temp (F)| 225 225 225 225
Burner Orifice Diameter

(in. ...drill size)

Thermostat Heat Anticipator

Setting (amps)

Gas Input (Btuh) Stage 1 Low 262,500 262,500 262,500 262,500

Efficiency (Steady State) (%) 82 82 82 82
Temperature Rise Range 15-45/35-65 15-45/35-65 15-45/35-65 15-45/35-65
Manifold Pressure (in. wg)

Gas Valve Quantity 22 2 2
Field Gas Connection Size

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

OUTDOOR-AIR FILTERS 8...16 × 25

Quantity...Size (in.) 4...20 × 25

RETURN-AIR FILTERS

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

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

Motor, Quantity...Hp 4...1 4...1 4...1 4...1
Fan, Diameter... Width (in.) 11...10 11...10 11...10 11...10

(High Efficiency) S184T S215T S254T S213T S215T S254T S215T S254T S256T S215T S254T S256T

1

⁄

8

13⁄

8

15⁄

15

⁄

1...BX59622...BX51542...5VX530531...BX59621...5VX590592...5VX530532...BX52552...5VX500502...5VX530532...BX51542...5VX530532...5VX530

Natural Gas Std .111...34 .111...34 .111...34 .111...34
Liquid Propane Alt .089...43 .089...43 .089...43 .089...43

Stage 1 0.1 0.1 0.1 0.1
Stage 2 0.1 0.1 0.1 0.1

High 394,000 394,000 394,000 394,000

Stage 2 Low 350,000 350,000 350,000 350,000

High 525,000 525,000 525,000 525,000

Natural Gas Std 3.5 3.5 3.5 3.5
Liquid Propane Alt 3.5 3.5 3.5 3.5

(in.-FPT)

16

1.5 1.5 1.5 1.5

LEGEND

Al — Aluminum
Cu — Copper

*Weightof unit does not include variable frequency drive(VFD) barometric relief, or power

exhaust. If a VFD is installed, add the VFD weight in the table at right.

†Evaporator coil fin material/condenser coil fin material.

**Sizes 024-034: Circuit 1 uses the lowerportion of condensercoil, Circuit 2uses 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. See

Table 2 for more information.
\Rollout switch is manual reset.

3

⁄89 Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins

3

⁄89 Copper Tubes, Aluminum Plate Fins, Intertwined Circuits

8

13⁄

8

13⁄

8

15⁄

8

13⁄

8

15⁄

8

15⁄

8

13⁄

8

15⁄

8

15⁄

8

115⁄

16

115⁄

16

115⁄

16

53

NOTE: High heat is for 48EJ,EW only.

VFD
(Hp)

208/230 v 460 v 575 v

VFD WEIGHTS (lb)

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

10

Table 1 — Physical Data (cont)

UNIT 48EJ,EK,EW,EY 038D/E 044D/E 048D/E
NOMINAL CAPACITY (tons) 35 40 45
OPERATING WEIGHT (lb)*

Unit

Al/Al† (Lo Heat/Hi Heat) 4442/4602 4668/4828 4955/5115
Al/Cu† (Lo Heat/Hi Heat) 4727/4887 4953/5113 5335/5495
Roof Curb (14-in. curb) 410 410 410

COMPRESSOR

Type Ckt 1 06D537 06EA250 06EA265

Ckt 2 06D537 06EA250 06EA250

Number of Refrigerant Circuits 222

Oil (oz) (Ckt 1, 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) 111

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 (Standard) S215T D254T S256T D254T S256T S284T S256T S284T S286T

Motor Bearing Type Ball Ball Ball
Maximum Allowable Rpm 1200 1200 1200
Motor Pulley Pitch Diameter 6.1 5.3 5.7 5.3 5.7 7.5 6.3 5.9 7.5
Nominal Motor Shaft Diameter (in.) 1
Fan Pulley Pitch Diameter (in.) 13.7 9.5 9.5 9.5 9.5 11.1 11.1 12.5 11.1
Nominal Fan Shaft Diameter (in.) 1
Belt, Quantity...Type
Belt, Length (in.)
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
Factory Speed Setting (rpm) 779 976 1050 976 1050 1182 993 1134 1182

FURNACE SECTION

Rollout Switch Cutout Temp (F)| 225 225 225
Burner Orifice Diameter

(in. ...drill size)

Thermostat Heat Anticipator

Setting (amps)

Gas Input (Btuh) Stage 1 Low 300,000 300,000 300,000

Efficiency (Steady State) (%) 82 82 82
Temperature Rise Range 10-40/30-60 10-40/30-60 10-40/30-60
Manifold Pressure (in. wg)

Gas Valve Quantity 222
Field Gas Connection Size (in.-FPT) 1.5 1.5 1.5

HIGH-PRESSURE SWITCH (psig)

Cutout 426 426 426
Reset (Auto.) 320 320 320

LOW-PRESSURE SWITCH (psig)

Cutout 777
Reset (Auto.) 22 22 22

OUTDOOR-AIR FILTERS 8...16 × 25

Quantity...Size (in.) 4...20 × 25

RETURN-AIR FILTERS

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

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

Motor, Quantity...Hp 4...1 4...1 4...1
Fan, Diameter... Width (in.) 11...10 11...10 11...10

(High Efficiency) S215T S254T S256T S254T S256T S284T S256T S284T S286T

3

⁄

8

1...5VX650652...5VX530532...5VX550552...5VX530532...5VX550552...5VX590592...5VX570572...5VX630632...5VX610

Natural Gas Std .120...31 .120...31 .120...31
Liquid Propane Alt .096...41 .096...41 .096...41

Stage 1 0.1 0.1 0.1
Stage 2 0.1 0.1 0.1

High 600,000 600,000 600,000

Stage 2 Low 400,000 400,000 400,000

High 800,000 800,000 800,000

Natural Gas Std 3.5 3.5 3.5
Liquid Propane Alt 3.5 3.5 3.5

15⁄

8

15

⁄

16

LEGEND

Al — Aluminum
Cu — Copper

*Weightof unit does not include variable frequency drive(VFD) barometric relief, or power

exhaust. If a VFD is installed, add the VFD weight in the table at right.

†Evaporator coil fin material/condenser coil fin material.

**Sizes 024-034: Circuit 1 uses the lowerportion of condensercoil, Circuit 2uses 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. See

Table 2 for more information.
\Rollout switch is manual reset.

3

⁄89 Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins

3

⁄89 Copper Tubes, Aluminum Plate Fins, Intertwined Circuits

15⁄

8

15⁄

8

115⁄

15⁄

8

16

17⁄

8

15⁄

8

NOTE: High heat is for 48EJ,EW only.

VFD
(Hp)

208/230 v 460 v 575 v

VFD WEIGHTS (lb)

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

115⁄

17⁄

8

16

17⁄

8

59

11

Table 2 — Evaporator Fan Motor Data (Units with Starting Serial Numbers 4197 and Later)

UNIT

MOTOR

SIZE

48E

024

028

030

034

038

044

048

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

MOTOR

SHAFT

HP

10 1.38 924 2BK50 4.4 None-1.375 2B5V86 8.6 B-1.9375 (2) BX51 54 5.21
15 1.62 1096 2B5V56 5.7 B-1.625 2B5V90 9.1 B-1.9375 (2) 5VX530 53 6.00

7.5 1.38 773 BK60H 5.4 H-1.375 1B5V124 12.4 B-1.9375 BX59 62 6.48
10 1.38 962 1B5V60 6.1 H-1.375 1B5V110 11.1 B-1.9375 5VX590 59 7.37
15 1.62 1106 2B5V54 5.5 B-1.625 2B5V86 8.7 B-1.9375 (2) 5VX530 53 6.12

10 1.38 848 2BK50 4.4 None-1.375 2B5V94 9.4 B-1.9375 (2) BX52 55 5.27
15 1.62 1059 2B5V48 4.9 B-1.625 2B5V80 8.1 B-1.9375 (2) 5VX500 50 6.63
20 1.62 1187 2B5V58 5.9 B-1.625 2B5V86 8.7 B-1.9375 (2) 5VX530 53 7.31

10 1.38 884 2BK50 4.4 H-1.375 2B5V90 9.0 B-1.9375 (2) BX51 54 5.24
15 1.62 1096 2B5V56 5.7 B-1.625 2B5V90 9.1 B-1.9375 (2) 5VX530 53 6.00
20 1.62 1187 2B5V58 5.9 B-1.625 2B5V86 8.7 B-1.9375 (2) 5VX530 53 7.31

10 1.38 779 1B5V60 6.1 None-1.375 1B5V136 13.7 B-1.9375 5VX650 65 7.62
15 1.62 976 2B5V52 5.3 B-1.625 2B5V94 9.5 B-1.9375 (2) 5VX530 53 6.37
20 1.62 1050 2B5V56 5.7 B-1.625 2B5V94 9.5 B-1.9375 (2) 5VX550 55 7.60

15 1.62 976 2B5V52 5.3 B-1.625 2B5V94 9.5 B-1.9375 (2) 5VX530 53 6.37
20 1.62 1050 2B5V56 5.7 B-1.625 2B5V94 9.5 B-1.9375 (2) 5VX550 55 7.60
25 1.88 1182 2B5V74 7.5 B-1.875 2B5V110 11.1 B-1.9375 (2) 5VX590 59 7.60

20 1.62 993 2B5V62 6.3 B-1.625 2B5V110 11.1 B-1.9375 (2) 5VX570 57 7.22
25 1.88 1134 2B5V80 5.9 B-1.875 2B5V124 12.5 B-1.9375 (2) 5VX630 63 7.36
30 1.88 1182 2B5V74 7.5 B-1.875 2B5V110 11.1 B-1.9375 (2) 5VX590 59 9.07

DIA.
(in.)

5 1.12 717 BK55 4.8 None-1.125 1B5V124 12.4 B-1.9375 BX59 62 5.10

FAN
SHAFT
SPEED

(rpm)

MOTOR

SHEAVE

MOTOR

SHEAVE

PITCH

DIAMETER

(in.)

BUSHING

DIAMETER

(in.)

15

⁄16inches.

FAN

FAN

SHEAVE

SHEAVE

PITCH

DIAMETER

(in.)

BUSHING

DIAMETER

(in.)

BELT

(QUANTITY)

OUTSIDE

BELT

LENGTH

TENSION

Step 4 — Install Flue Hood — Flue hood is shipped

inside gas section of unit. To install, secure flue hood to ac­cess panel. See Fig. 10.

NOTE: When properly installed, flue hood will line up with
combustion fan housing. See Fig. 11.

BELT

(Lb at

.24 in.)

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

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

Fig. 10 — Flue Hood Location

12

Step5—TrapCondensate Drain — See Fig. 3-6

for drain location. Condensate drain is open to atmosphere
and must be trapped. Install a trapped drain at the drain lo­cation. A trap at least 4-in. deep must be used. See Fig. 12.
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. The condensate drain pan is fitted with a 1-in.
FPT coupling.

Step 6 — Install Gas Piping — Unit is equipped for

use with natural gas. Installation must conform with local
building codes or, in the absence of local codes, with the
National Fuel Gas Code, ANSI Z223.1.

Install manual gas shutoff valve with a
sure tap for test gage connection at unit. Field gas piping
must include sediment trap and union. See Fig. 13. An

1

⁄8-in. NPT is also located on the gas manifold adjacent to

the gas valve.

Do not pressure test gas supply while connected to unit.
Always disconnect union before servicing.

IMPORTANT: Natural gas pressure at unit gas con­nection must not be less than 5 in. wg or greater than

13.5 in. wg.

1

⁄8-in. NPT pres-

Fig. 11 — Combustion Fan Housing Location

Size gas-supply piping for 0.5-in. wg maximum pressure
drop. Do not use supply pipe smaller than unit gas
connection.

Step 7 — 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 Carrier Comfort Sys­tem (TEMP or VVTt); optional electronic expansion board
installed (CV or VAV); linked to the Carrier Comfort
Network; and availability of a computer and software
(ComfortWorks™ Building Supervisor, and Service Tool) or
LID-2B accessory installed 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.

All units are equipped with a supply air thermistor (SAT)
located in the supply fan discharge and an outdoor air ther­mistor (OAT) located in the outdoor air hood. Variable air
volume units are supplied with a return air thermistor (RAT)
located on the return air damper support.

CONSTANT VOLUME APPLICATIONS — The units, as
shipped, are operable as stand-alone units, using either a stand­ard (mechanical or electronic) 2-stage heat, 2-stage cool ther­mostat, or with an electronic room sensor and a timeclock to
establish unit start and stop times.

With a standard thermostat (programmable is optional),
heating and cooling operation is set by space temperature.

With a space sensor and timeclock, the machine will op­erate at default values unless they are changed using appro­priate input devices. The space sensor senses space tempera­ture and may be equipped with a timed override feature, which
allows unit operation during unoccupied periods.

Fig. 12 — Condensate Drain Trap Piping Details

(Typical Roof Curb or Slab Mount Shown)

Fig. 13 — Field Gas Piping

The space sensors may be used in multiples of 4 or 9 to
achieve space temperature averaging. The use of a space sen­sor also allows the unit to be turned on and off from a re­mote signal.

Features with Thermostat Control of Unit

• two-stage heating

• 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

13

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

UNIT CONFIGURATION DEFAULT COOLING DEFAULT HEATING
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

LEGEND

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

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)

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

Enabled).

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

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)*

• 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, minimum off and on
times)

• compressor lockout during low supply-air temperature

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)

• control board diagnostics

• ability to change supply air set point (economizer control)

• ability to change high outdoor 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
2 sensor options available:

• 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 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

Additional 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-55or T-56 sensors
for a timed period of 1 to 4 hours

• ability to use multiple space temperature sensors to aver­age the space temperature

• temperature compensated start to calculate early start times
before occupancy

• access to the Display, Maintenance, Configuration,
Service, and Set Point data tables 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. See Fig. 14 for remote
start/stop wiring.

NOTE: For units with a field-supplied space temperature se­sor 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 pre­configured occupied default set points (based on return-air
temperature) of 78 F cooling and 68 F heating. Without this
feature, the unit will control to the unoccupied default set
points of 90 F cooling and 55 F heating.

An electronic expansion board may be field-installed to
provide the following features:

• control of modulating economizer damper to maintain in-

door air quality (IAQ) when outdoor conditions are
suitable

NOTE: The IAQ sensor must be set for current output
(4 to 20 mA), not voltage output. Ensure the jumper on
the sensor is in the upper position. See Fig. 15.

• provide discrete inputs for fan status, filter status, field-

applied status, and demand limit

• provide an output for the external alarm light indicator

• provide power exhaust fire outputs for direct control of

modulated power exhaust stages during fire or smoke modes

• control of smoke control modes including evacuation, smoke

purge, pressurization, and fire shutdown (modulating power
exhaust required)

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 CCN IAQ participation

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

14

REMOTE
START/STOP
SWITCH
(FIELD-SUPPLIED)

R

Y1
Y2
W1

W2

G
C

X

CONTROL
BOX

LEGEND

Field Supplied Wiring

Fig. 14 — Field Control Remote Start/Stop

JUMPER CONNECTION
FOR VOLTAGE OUTPUT

JUMPER CONNECTION
FOR CURRENT OUTPUT

Fig. 15 — Indoor Air Quality Sensor Configuration

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 Com­fortWorks™, Building Supervisor, or Service Tool software,
or accessory LID-2B, 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. 16. The timeclock has a 10-hour mini­mum back-up time to provide for unit power off for servic­ing unit or during unexpected power outages. For complete
Carrier Comfort System (CCS) or Carrier Comfort Network
(CCN) features and benefits, refer to the product literature.

VARIABLE AIR VOLUME (VAV) APPLICATIONS
Features with Stand-Alone Applications — The units, as

shipped, are operable as stand-alone units with the addition
of a timeclock to establish unit start and stop times.

Heating and cooling in both on and off modes is con­trolled to default values by the base unit control. Set points
may be changed with appropriate input devices.

The control has an on-board occupancy schedule which
can be set using an input device and eliminates the need for
an external timeclock.

During both the on and off periods, cooling operation is
controlled to the supply air setting and heating is controlled
to the return air setting (or to the optional space temperature
sensor). During the on period, the supply fan runs continu­ously.During the off period, the supply fan will be activated
if the return air sensor is outside of the set points and will
run log enough to accurately sample the space temperature.
The supply fan will then continue to run until any heating or
cooling load is satisfied, at which point it will turn off.

The use of a space sensor will allow for supply air reset
to conserve energy and maintain comfort. If equipped with
an override feature, the sensor will allow operation during
the off period for a fixed length of time.

Base unit control supports a Heat Interlock Relay (field
supplied) to fully open the VAV terminal devices during heat­ing operation.

Standard features of a VAV unit with a remote start/stop
switch are:

• control board diagnostics

• 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 ex-

haust controller

• support supply-air temperature reset to offset supply air

set point

• support a field test for field check out

• support linkage to DAV systems

• cooling capacity control of up to 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 return-air tem-

perature at heating set point during occupied periods

• provide a variable frequency drive high voltage relay out-

put to enable VFD

• control of heat interlock relay

• compressor Time Guard override (power up, minimum off

and on times)

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.

Additional features may be provided with Electronic
Access to Unit Control Board. These features are:

• additional control board diagnostics

• electronic expansion board features (if installed)

• control of the economizer damper and indoor fan to obtain

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, ComfortWorks, or Service Tool software soft­ware or accessory LID-2B

15

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

• 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

• fire unit shutdown

• fire pressurization

• fire evacuation

• fire smoke purge

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

• modulated power exhaust override

• ability to use multiple space temperature sensors (mul-

tiples of 4 and 9 only) to average space temperature (DAV
only)

Afield-supplied T -55space temperature sensor can be added
to 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 (return air temperature) heating. See
Fig. 14 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.

Features with NetworkApplications —The base control board
provides, as standard, a connection for use with a Carrier
Comfort System and can also be integrated into a Carrier
Comfort Network. When the unit is accessed via a PC equipped
with ComfortWorks™, Building Supervisor, or Service Tool
software or LID-2B accessory,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. 16. The internal 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 8 — Make Electrical Connections

POWER WIRING — Units are factory wired for the voltage
shown on the unit nameplate.

When installing units, provide a disconnect per NEC
(National 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. 17 for power wiring con­nections to the unit power terminal block andequipment ground.

The main power terminal block is suitable for use with
aluminum or copper wire. See Fig. 17. Units have circuit
breakers for compressors, fan motors, and control circuit. If
required by local codes, provide an additional disconnectswitch.
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 C1-latest year.

All field wiring must comply with NEC and local code
requirements.

FIELD POWER SUPPLY — Unit is factory wired for volt­age shown on unit 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).

1

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

A3

3

⁄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
diameter hole provided. After wires are in unit control box,
connect to power terminal block (see Power Wiring section
above).

Low-voltage wiring must be run in watertight conduit from
the basepan to control box and through

7

⁄8-in. diameter hole
provided in bottom of unit control box. Field-supplied strain
relief must be used going into the box. After wiring is in
control box, make connections to proper terminals on ter­minal blocks (see Field Control Wiring section on page 21).

Install conduit connector in unit basepan as shown in
Fig. 3-6. Route power and ground lines through connector to
terminal connections in unit control box as shown on unit
wiring diagram and Fig. 17.

Routing Through Side of Unit — Route power wiring in field­supplied watertight conduit into unit through 21⁄2-in. hole.
See Fig. 17.

Use field-supplied strain relief going into control box through

1

⁄2-in. diameter hole provided. After wires are in unit con-

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

Bring low-voltage control wiring through factory-drilled

7

⁄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 page 21).

1

⁄2-in.

16

17

LEGEND

CCN — Carrier Comfort Network
COM — Common
D—Diode
LED — Light-Emitting Diode
N.C. — Normally Closed

N.O. — Normally Open
R—Relay
SIO — Serial Input/Output
SW — Switch
T—Terminal

Fig. 16 — Control Board Diagram

*Where X is the unit control software version number.

Table 4 — Electrical Data

UNIT

SIZE

48E

024

028

030

NOMNAL

VOLTAGE

(3 Ph 60 Hz)

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

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

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

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

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

VOLTAGE

RANGE

Min Max RLA LRA RLA LRA Qty Hp

COMPRESSOR

No. 1 No. 2

OFM IFM

POWER

EXHAUST

FLA

Hp FLA FLA LRA FLA MCA MOCP*

(ea)

— — 0.96 101.8/100.3 125/125

16.7/

5

15.2

23.6 41.6 0.96 125.4/123.9 150/150
— — 0.96 115.9/113.1 150/150

30.8/

10

28.0

23.6 41.6 0.96 139.5/136.7 175/175
— — 0.96 131.3/127.1 150/150

46.2/

15

42.0

23.6 41.6 0.96 154.9/150.7 175/175

5 7.6

10 14.0

15 21.0

5 6.1

10 11.0

15 17.0

7.5

10

15

7.5 11.0

10 14.0

15 21.0

7.5 9.0

10 11.0

15 17.0

10

15

20

10 14.0

15 21.0

20 27.0

10 11.0

15 17.0

20 22.0

— — 0.50 49.4 60

12.6 23.6 0.50 62.0 80
— — 0.50 55.8 70

12.6 23.6 0.50 68.4 80
— — 0.50 62.8 80

12.6 23.6 0.50 75.4 90
— — 0.50 40.5 50

12.6 23.6 0.50 53.1 60
— — 0.50 45.4 60

12.6 23.6 0.50 58.0 70
— — 0.50 51.4 60

12.6 23.6 0.50 64.0 80
— — 0.96 122.8/120.6 150/150

24.2/

22.0

23.6 41.6 0.96 146.4/144.2 175/175
— — 0.96 129.4/126.6 150/150

30.8/

28.0

23.6 41.6 0.96 153.0/150.2 175/175
— — 0.96 144.8/140.6 175/175

46.2/

42.0

23.6 41.6 0.96 168.4/164.2 200/200
— — 0.50 61.2 80

12.6 23.6 0.50 73.8 90
— — 0.50 64.2 80

12.6 23.6 0.50 76.8 90
— — 0.50 71.2 90

12.6 23.6 0.50 83.8 100
— — 0.50 49.8 60

12.6 23.6 0.50 62.4 70
— — 0.50 51.8 60

12.6 23.6 0.50 64.4 80
— — 0.50 57.8 70

12.6 23.6 0.50 70.4 80
— — 0.96 151.9/149.1 200/200

30.8/

28.0

23.6 41.6 0.96 175.5/172.7 225/225
— — 0.96 167.3/163.1 225/225

46.2/

42.0

23.6 41.6 0.96 190.9/186.7 225/225
— — 0.96 180.5/175.1 225/225

59.4/

54.0

23.6 41.6 0.96 204.1/198.7 250/250
— — 0.50 71.3 90

12.6 23.6 0.50 83.9 100
— — 0.50 78.3 100

12.6 23.6 0.50 90.9 110
— — 0.50 84.3 100

12.6 23.6 0.50 96.9 110
— — 0.50 57.4 70

12.6 23.6 0.50 70.0 90
— — 0.50 63.4 80

12.6 23.6 0.50 76.0 90
— — 0.50 68.4 80

12.6 23.6 0.50 81.0 100

COMBUSTION

FAN MOTOR

See Legend and Notes on page 19.

POWER SUPPLY

18

Table 4 — Electrical Data (cont)

UNIT

FLA — Full Load Amps
HACR — Heating, Air Conditioning and

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

*Fuse or HACR circuit breaker.

NOTES:

1. In compliance with NEC requirements for multimotor and combi-

2. Unbalanced 3-Phase Supply Voltage

NOMINAL

SIZE

VOLTAGE

48E

(3 Ph 60 Hz)

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

034

038

nation load equipment (refer to NEC Articles 430 and 440), the
overcurrent protective device for the unit shall be fuse or HACR
breaker. Canadian units may be fuse or circuit breaker.

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

the percent voltage imbalance.
% Voltage Imbalance

= 100 x

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

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

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

Refrigeration

max voltage deviation from average voltage

VOLTAGE

RANGE

Min Max RLA LRA RLA LRA Qty Hp

LEGEND

Use the following formula to determine

average voltage

COMPRESSOR

No. 1 No. 2

or

OFM IFM

FLA

Hp FLA FLA LRA FLA MCA MOCP*

(ea)

10

15

20

10 14.0

15 21.0

20 27.0

10 11.0

15 17.0

20 22.0

10

15

20

10 14.0

15 21.0

20 27.0

10 11.0

15 17.0

20 22.0

EXAMPLE: Supply voltage is 460-3-60.

Determine maximum deviation from average voltage.

(AB) 457 − 452=5v
(BC) 464 − 457=7v
(AC) 457 − 455=2v

Maximum deviation is 7 v.
Determine percent 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.

POWER

EXHAUST

— — 0.96 169.9/167.1 225/200

30.8/

28.0

23.6 41.6 0.96 193.5/190.7 250/225
— — 0.96 185.3/181.1 225/225

46.2/

42.0

23.6 41.6 0.96 208.9/204.7 250/250
— — 0.96 198.5/193.1 250/250

59.4/

54.0

23.6 41.6 0.96 222.1/216.7 275/250
— — 0.50 77.0 100

12.6 23.6 0.50 89.6 110
— — 0.50 84.0 100

12.6 23.6 0.50 96.6 110
— — 0.50 90.0 110

12.6 23.6 0.50 102.6 125
— — 0.50 61.9 80

12.6 23.6 0.50 74.5 90
— — 0.50 67.9 80

12.6 23.6 0.50 80.5 100
— — 0.50 72.9 90

12.6 23.6 0.50 85.5 100
— — 0.96 180.5/177.7 225/225

30.8/

28.0

23.6 41.6 0.96 204.1/201.3 250/250
— — 0.96 195.9/191.7 250/225

46.2/

42.0

23.6 41.6 0.96 219.5/215.3 275/250
— — 0.96 209.1/203.7 250/250

59.4/

54.0

23.6 41.6 0.96 232.7/227.3 275/275
— — 0.50 82.4 100

12.6 23.6 0.50 95.0 110
— — 0.50 89.4 110

12.6 23.6 0.50 102.0 125
— — 0.50 95.4 110

12.6 23.6 0.50 108.0 125
— — 0.50 66.7 80

12.6 23.6 0.50 79.3 90
— — 0.50 72.7 90

12.6 23.6 0.50 85.3 100
— — 0.50 77.7 90

12.6 23.6 0.50 90.3 110

COMBUSTION

FAN MOTOR

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

Average Voltage =

7

457

= 1.53%

POWER SUPPLY

452 + 464 + 455

3

1371

=

3

= 457

19

Table 4 — Electrical Data (cont)

UNIT

FLA — Full Load Amps
HACR — Heating, Air Conditioning and

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

*Fuse or HACR circuit breaker.

NOTES:

1. In compliance with NEC requirements for multimotor and combi-

2. Unbalanced 3-Phase Supply Voltage

NOMINAL

SIZE

VOLTAGE

48E

(3 Ph 60 Hz)

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

044

048

nation load equipment (refer to NEC Articles 430 and 440), the
overcurrent protective device for the unit shall be fuse or HACR
breaker. Canadian units may be fuse or circuit breaker.

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

the percent voltage imbalance.
% Voltage Imbalance

= 100 x

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

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

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

Refrigeration

max voltage deviation from average voltage

VOLTAGE

RANGE

Min Max RLA LRA RLA LRA Qty Hp

LEGEND

Use the following formula to determine

average voltage

COMPRESSOR

No. 1 No. 2

or

OFM IFM

FLA

Hp FLA FLA LRA FLA MCA MOCP*

(ea)

15

20

25

15 21.0

20 27.0

25 34.0

15 17.0

20 22.0

25 27.0

20

25

30

20 27.0

25 34.0

30 40.0

20 22.0

25 27.0

30 32.0

EXAMPLE: Supply voltage is 460-3-60.

Determine maximum deviation from average voltage.

(AB) 457 − 452=5v
(BC) 464 − 457=7v
(AC) 457 − 455=2v

Maximum deviation is 7 v.
Determine percent voltage imbalance.

% Voltage Imbalance = 100 x

This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.

IMPORTANT:Ifthesupply voltage phase imbalance is more than
2%, contact your local electric utility company immediately.

POWER

EXHAUST

— — 0.96 223.1/218.9 275/275

46.2/

42.0

23.6 41.6 0.96 246.7/242.5 300/300
— — 0.96 236.3/230.9 300/300

59.4/

54.0

23.6 41.6 0.96 259.9/254.5 300/300
— — 0.96 251.7/244.9 300/300

74.8/

68.0

23.6 41.6 0.96 275.3/268.5 300/300
— — 0.50 96.6 125

12.6 23.6 0.50 109.2 125
— — 0.50 102.6 125

12.6 23.6 0.50 115.2 125
— — 0.50 109.6 125

12.6 23.6 0.50 122.2 150
— — 0.50 86.7 110

12.6 23.6 0.50 99.3 125
— — 0.50 91.7 110

12.6 23.6 0.50 104.3 125
— — 0.50 96.7 110

12.6 23.6 0.50 109.3 125
— — 0.96 252.4/247.0 300/300

59.4/

54.0

23.6 41.6 0.96 276.0/270.6 300/300
— — 0.96 267.8/261.0 300/300

74.8/

68.0

23.6 41.6 0.96 291.4/284.6 300/300
— — 0.96 281.0/273.0 300/300

88.0/

80.0

23.6 41.6 0.96 304.6/296.6 350/300
— — 0.50 119.5 150

12.6 23.6 0.50 132.1 150
— — 0.50 126.5 150

12.6 23.6 0.50 139.1 175
— — 0.50 132.5 150

12.6 23.6 0.50 145.1 175
— — 0.50 101.6 125

12.6 23.6 0.50 114.2 125
— — 0.50 106.6 125

12.6 23.6 0.50 119.2 150
— — 0.50 111.6 125

12.6 23.6 0.50 124.2 150

COMBUSTION

FAN MOTOR

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

Average Voltage =

7

457

= 1.53%

POWER SUPPLY

452 + 464 + 455

3

1371

=

3

= 457

20