Carrier 50Ss018 060 Users Manual

50SX024-060 to the manual 2e6bbecd-c64a-4e61-b4a3-ac5f53212b32

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Page Count: 48

Installation, Start-Up and

Service Instructions

CONTENTS Page

SAFETY CONSIDERATIONS .................1-12

General ......................................1

RECEIVING AND INSTALLATION ...........13-26

Step 1 — Check Equipment ..................13

• IDENTIFY UNIT

• INSPECT SHIPMENT

Step 2 — Provide Unit Support ..............13

• ROOF CURB

• SLAB MOUNT

Step 3 — Provide Clearances ................13

Step 4 — Rig and Place Unit .................13

• UNITS WITHOUT BASE RAILS

• UNITS WITH OPTIONAL BASE RAILS

Step 5 — Select and Install Ductwork ........16

• CONVERTING HORIZONTAL DISCHARGE

UNITS TO DOWNFLOW (VERTICAL) DISCHARGE

— STD (NON-ICM) UNITS

• CONVERTING HORIZONTAL DISCHARGE UNITS

TO DOWNFLOW (VERTICAL) DISCHARGE

— ICM UNITS

• ACCESSORY DUCT FLANGE KIT INSTALLATION

Step 6 — Provide for Condensate Disposal ...20

Step 7 — Install Electrical Connections ......21

• HIGH-VOLTAGE CONNECTIONS

• ROUTING POWER LEADS INTO UNIT

• CONNECTING GROUND LEAD TO

WIRE-BINDING SCREW

• ROUTING CONTROL POWER WIRES — STD

NON-ICM UNITS (24 V)

• ROUTING CONTROL POWER WIRES — ICM

UNITS (24 V)

• SPECIAL PROCEDURES FOR 208-V

OPERATION

PRE-START-UP ............................26,27

START-UP ................................27-39

Check for Refrigerant Leaks .................27

Start-Up Cooling Section and

Make Adjustments ........................27

MAINTENANCE ............................40,41

Air Filter ....................................40

Unit Top Removal ...........................40

Evaporator Blower and Motor ................40

Condenser Coil, Evaporator Coil,

and Condensate Drain Pan ................41

Condenser Fan .............................41

Electrical Controls and Wiring ...............41

Refrigerant Circuit ..........................41

Evaporator Airflow ..........................41

Metering Devices ...........................41

Liquid Line Strainer .........................41

TROUBLESHOOTING COOLING CHART .....42,43

START-UP CHECKLIST .....................CL-1

NOTE TO INSTALLER — Before the installation, READ

THESE INSTRUCTIONS CAREFULLY AND COM-

PLETELY. Also, make sure the Owner’s Manual and Serv-

ice Instructions are left with the unit after installation.

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment

can be hazardous due to system pressure and electrical com-

ponents. Only trained and qualified personnel should install,

repair, or service air-conditioning equipment.

Untrained personnel can perform basic maintenance func-

tions of cleaning coils and 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. Wear safety glasses and work gloves.

Use quenching cloth for unbrazing operations. Have fire ex-

tinguisher available for all brazing operations.

Before performing service or maintenance operations on

system, turn off main power to unit. Turn off accessory

heater power switch if applicable. Electrical shock can

cause personal injury.

General — 50SS,SX cooling units are fully self-contained

and designed for outdoor installation. See Fig. 1. As shown

in Fig. 2-9, both small- and large-cabinet units are shipped

in a horizontal-discharge configuration for installation on

a ground-level slab. All units can be converted to down-

flow discharge configurations for rooftop applications. See

Fig. 10 for roof curb dimensions.

Instructions continued on page 13.

Fig. 1 — Unit 50SX With Optional Base Rail Shown

50SS018-060

50SX024-060

Single-Package Cooling Units

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

Book 1 4

Tab 1b 6b

PC 111 Catalog No. 535-022 Printed in U.S.A. Form 50SS,SX-4SI Pg 1 5-95 Replaces: 50SS,SX-3SI

REQUIRED CLEARANCES TO COMBUSTIBLE MATERIAL — in. (mm)

Unit Top ................................14(356)

Duct Side of Unit ............................2(51)

Side Opposite Ducts ........................14(356)

Bottom of Unit .................................0

Vertical Discharge First 12 in. (305) of Supply Duct .......1(25)

NECESSARY REQUIRED CLEARANCES — in. (mm)

Between Units, Control Box Side ................42(1067)

Unit and Ungrounded Surfaces, Control Box Side ......36(914)

Unit and Block or Concrete Walls and Other Grounded

Surfaces, Control Box Side ...................42(1067)

REQUIRED CLEARANCES FOR SERVICING — in. (mm)

Evaporator Coil Access Side ...................30(762)

Control Box Access Side ......................30(762)

(Except for Necessary Requirements)

Unit Top ................................36(914)

Side Opposite Ducts ........................30(762)

UNIT

50SS CENTER OF GRAVITY (in./mm)

XYZ

018 19.6/499 21.7/551 10.6/269

024 22.5/570 20.9/530 10.0/254

030 22.1/561 20.3/516 10.0/253

036 21.2/538 19.9/506 9.9/251

042 21.3/540 19.9/506 11.3/286

LEGEND

CG — Center of Gravity NEC — National Electrical Code

COND — Condenser REQ’D — Required

MAT’L — Material

NOTES:

1. Clearances must be maintained to prevent recirculation of air from

outdoor-fan discharge.

2. Dimensions in ( ) are in millimeters.

UNIT

50SS ELECTRICAL

CHARACTERISTICS UNIT WT CORNER WT (Lb/Kg) UNIT HEIGHT

(in./mm) DIMENSION

(in./mm)

Lb Kg A B C D E F

018 208/230-1-60 208 95 61/28 43/20 69/31 35/16 24.1/613 18.2/462

024 208/230-1-60 237 108 60/27 54/25 92/42 31/14 24.1/613 18.2/462

030 208/230-1-60, 208/230-3-60 254 115 61/28 58/26 96/44 39/18 24.1/613 18.2/462

036 208/230-1-60, 208/230-3-60, 460-3-60 270 123 75/35 48/22 109/50 37/17 24.1/613 18.2/462

042 208/230-1-60, 208/230-3-60, 460-3-60 300 135 81/40 57/26 117/53 45/20 28.1/714 22.2/563

Fig. 2 — Dimensions; Units 50SS018-042 Without Base Rail

2

REQUIRED CLEARANCES TO COMBUSTIBLE MATERIAL — in. (mm)

Unit Top ................................14(356)

Duct Side of Unit ............................2(51)

Side Opposite Ducts ........................14(356)

Bottom of Unit .................................0

Vertical Discharge First 12 in. (305) of Supply Duct .......1(25)

NECESSARY REQUIRED CLEARANCES — in. (mm)

Between Units, Control Box Side ................42(1067)

Unit and Ungrounded Surfaces, Control Box Side ......36(914)

Unit and Block or Concrete Walls and Other Grounded

Surfaces, Control Box Side ...................42(1067)

REQUIRED CLEARANCES FOR SERVICING — in. (mm)

Evaporator Coil Access Side ...................30(762)

Control Box Access Side ......................30(762)

(Except for Necessary Requirements)

Unit Top ................................36(914)

Side Opposite Ducts ........................30(762)

UNIT

50SS CENTER OF GRAVITY (in./mm)

XYZ

018 19.5/495 21.7/551 12.9/328

024 22.1/562 20.9/532 12.3/313

030 21.8/554 20.4/519 12.3/312

036 21.0/533 20.1/509 12.2/310

042 21.0/532 20.1/510 13.6/344

LEGEND

CG — Center of Gravity NEC — National Electrical Code

COND — Condenser REQ’D — Required

MAT’L — Material

NOTES:

1. Clearances must be maintained to prevent recirculation of air from

outdoor-fan discharge.

2. Dimensions in ( ) are in millimeters.

UNIT

50SS ELECTRICAL

CHARACTERISTICS UNIT WT CORNER WT (Lb/Kg) UNIT HEIGHT

(in./mm) DIMENSION

(in./mm)

Lb Kg A B C D E F

018 208/230-1-60 228 104 66/30 48/22 74/34 40/18 27.4/697 21.5/546

024 208/230-1-60 257 117 65/30 59/27 97/44 36/16 27.4/697 21.5/546

030 208/230-1-60, 208/230-3-60 274 125 66/30 63/29 101/46 44/20 27.4/697 21.5/546

036 208/230-1-60, 208/230-3-60, 460-3-60 290 132 81/37 53/24 114/52 42/19 27.4/697 21.5/546

042 208/230-1-60, 208/230-3-60, 460-3-60 320 146 86/39 62/28 122/55 50/23 31.4/798 25.5/648

Fig. 3 — Dimensions; Units 50SS018-042 with Optional Base Rail

3

REQUIRED CLEARANCES TO COMBUSTIBLE MATERIAL — in. (mm)

Unit Top ....................................14(356)

Duct Side of Unit .................................2(51)

Side Opposite Ducts .............................14(356)

Bottom of Unit .....................................0

Vertical Discharge First 12 in. (305) of Supply Duct ...............1(25)

NECESSARY REQUIRED CLEARANCES — in. (mm)

Between Units, Control Box Side ......................42(1067)

Unit and Ungrounded Surfaces, Control Box Side ..............36(914)

Unit and Block or Concrete Walls and Other Grounded

Surfaces, Control Box Side .........................42(1067)

REQUIRED CLEARANCES FOR SERVICING — in. (mm)

Evaporator Coil Access Side .........................30(762)

Control Box Access Side ...........................30(762)

(Except for Necessary Requirements)

Unit Top ....................................36(914)

Side Opposite Ducts .............................30(762)

UNIT

50SS CENTER OF GRAVITY (in./mm)

XYZ

048 21.9/555 19.6/498 13.4/341

060 22.2/565 19.8/503 13.4/340

LEGEND

CG — Center of Gravity NEC — National Electrical Code

COND — Condenser REQ’D — Required

MAT’L — Material

NOTES:

1. Clearances must be maintained to prevent recirculation of air from outdoor-fan dis-

charge.

2. Dimensions in ( ) are in millimeters.

UNIT

50SS ELECTRICAL

CHARACTERISTICS UNIT WT CORNER WT (Lb/Kg)

Lb Kg A B C D

048 208/230-1-60, 208/230-3-60, 460-3-60 332 151 82/37 68/31 131/60 51/23

060 208/230-1-60, 208/230-3-60, 460-3-60 359 163 65/30 99/45 120/55 75/34

Fig. 4 — Dimensions; Units 50SS048,060 Without Base Rail

4

REQUIRED CLEARANCES TO COMBUSTIBLE MATERIAL — in. (mm)

Unit Top ..................................14(356)

Duct Side of Unit ..............................2(51)

Side Opposite Ducts ...........................14(356)

Bottom of Unit ..................................0

Vertical Discharge First 12 in. (305) of Supply Duct ............1(25)

NECESSARY REQUIRED CLEARANCES — in. (mm)

Between Units, Control Box Side ....................42(1067)

Unit and Ungrounded Surfaces, Control Box Side ............36(914)

Unit and Block or Concrete Walls and Other Grounded

Surfaces, Control Box Side ......................42(1067)

REQUIRED CLEARANCES FOR SERVICING — in. (mm)

Evaporator Coil Access Side .......................30(762)

Control Box Access Side .........................30(762)

(Except for Necessary Requirements)

Unit Top ..................................36(914)

Side Opposite Ducts ...........................30(762)

UNIT

50SS CENTER OF GRAVITY (in./mm)

XYZ

048 21.7/550 19.7/501 15.7/400

060 22.0/560 19.9/506 15.7/399

LEGEND

CG — Center of Gravity NEC — National Electrical Code

COND — Condenser REQ’D — Required

MAT’L — Material

NOTES:

1. Clearances must be maintained to prevent recirculation of air from outdoor-fan dis-

charge.

2. Dimensions in ( ) are in millimeters.

UNIT

50SS ELECTRICAL

CHARACTERISTICS UNIT WT CORNER WT (Lb/Kg)

Lb Kg A B C D

048 208/230-1-60, 208/230-3-60, 460-3-60 352 160 87/40 73/33 136/62 56/25

060 208/230-1-60, 208/230-3-60, 460-3-60 379 172 70/32 104/47 125/57 80/36

Fig. 5 — Dimensions; Units 50SS048,060 With Optional Base Rail

5

REQUIRED CLEARANCES TO COMBUSTIBLE MATERIAL — in. (mm)

Unit Top ................................14(356)

Duct Side of Unit ............................2(51)

Side Opposite Ducts ........................14(356)

Bottom of Unit .................................0

Vertical Discharge First 12 in. (305) of Supply Duct .......1(25)

NECESSARY REQUIRED CLEARANCES — in. (mm)

Between Units, Control Box Side ................42(1067)

Unit and Ungrounded Surfaces, Control Box Side ......36(914)

Unit and Block or Concrete Walls and Other Grounded

Surfaces, Control Box Side ...................42(1067)

REQUIRED CLEARANCES FOR SERVICING — in. (mm)

Evaporator Coil Access Side ...................30(762)

Control Box Access Side ......................30(762)

(Except for Necessary Requirements)

Unit Top ................................36(914)

Side Opposite Ducts ........................30(762)

NOTES:

1. Clearances must be maintained to prevent recirculation of air from

outdoor-fan discharge.

2. Dimensions in ( ) are in millimeters.

UNIT

50SX CENTER OF GRAVITY (in./mm)

XYZ

024 21.7/552 20.7/527 12.7/321

030 21.9/556 20.7/525 12.7/321

036 20.8/528 20.0/507 12.7/321

LEGEND

CG — Center of Gravity NEC — National Electrical Code

COND — Condenser REQ’D — Required

MAT’L — Material

UNIT

50SX ELECTRICAL

CHARACTERISTICS UNIT WT CORNER WT (Lb/Kg)

Lb Kg A B C D

024 208/230-1-60 270 123 67/30 62/28 99/45 42/19

030 208/230-1-60 273 124 66/30 64/29 100/45 43/20

036 208/230-1-60, 208/230-3-60, 460-3-60 291 132 80/36 54/25 112/51 45/20

Fig. 6 — Dimensions; Units 50SX024-036 Without Base Rail

6

REQUIRED CLEARANCES TO COMBUSTIBLE MATERIAL — in. (mm)

Unit Top ................................14(356)

Duct Side of Unit ............................2(51)

Side Opposite Ducts ........................14(356)

Bottom of Unit .................................0

Vertical Discharge First 12 in. (305) of Supply Duct .......1(25)

NECESSARY REQUIRED CLEARANCES — in. (mm)

Between Units, Control Box Side ................42(1067)

Unit and Ungrounded Surfaces, Control Box Side ......36(914)

Unit and Block or Concrete Walls and Other Grounded

Surfaces, Control Box Side ...................42(1067)

REQUIRED CLEARANCES FOR SERVICING — in. (mm)

Evaporator Coil Access Side ...................30(762)

Control Box Access Side ......................30(762)

(Except for Necessary Requirements)

Unit Top ................................36(914)

Side Opposite Ducts ........................30(762)

NOTES:

1. Clearances must be maintained to prevent recirculation of air from

outdoor-fan discharge.

2. Dimensions in ( ) are in millimeters.

LEGEND

CG — Center of Gravity NEC — National Electrical Code

COND — Condenser REQ’D — Required

MAT’L — Material

UNIT

50SX CENTER OF GRAVITY (in./mm)

XYZ

024 21.5/546 20.8/528 15.0/380

030 21.7/550 20.7/527 15.0/380

036 20.6/524 20.1/510 15.0/380

UNIT

50SX ELECTRICAL

CHARACTERISTICS UNIT WT CORNER WT (Lb/Kg)

Lb Kg A B C D

024 208/230-1-60 290 132 72/33 67/30 104/47 47/21

030 208/230-1-60 293 133 71/32 69/31 105/48 48/22

036 208/230-1-60, 208/230-3-60, 460-3-60 311 142 85/39 59/27 117/53 50/23

Fig. 7 — Dimensions; Units 50SX024-036 With Optional Base Rail

7

Fig. 8 — Dimensions; Units 50SX042-060 Without Base Rail

8

REQUIRED CLEARANCES TO COMBUSTIBLE MATERIAL — in. (mm)

Unit Top ........................................14(356)

Duct Side of Unit ...................................2(51)

Side Opposite Ducts ...............................14(356)

Bottom of Unit .........................................0

Vertical Discharge First 12 in. (305) of Supply Duct ...........1(25)

NECESSARY REQUIRED CLEARANCES — in. (mm)

Between Units, Control Box Side .....................42(1067)

Unit and Ungrounded Surfaces, Control Box Side ...........36(914)

Unit and Block or Concrete Walls and Other Grounded

Surfaces, Control Box Side .........................42(1067)

REQUIRED CLEARANCES FOR SERVICING — in. (mm)

Evaporator Coil Access Side .........................30(762)

Control Box Access Side ............................30(762)

(Except for Necessary Requirements)

Unit Top ........................................36(914)

Side Opposite Ducts ...............................30(762)

NOTES:

1. Clearances must be maintained to prevent recirculation of air from outdoor-

fan discharge.

2. Dimensions in ( ) are in millimeters.

LEGEND

CG — Center of Gravity NEC — National Electrical Code

COND — Condenser REQ’D — Required

MAT’L — Material

UNIT

50SX ELECTRICAL

CHARACTERISTICS UNIT WT CORNER WT (Lb/Kg)

Lb Kg A B C D

042 208/230-1-60, 208/230-3-60, 460-3-60 309 140 84/38 59/27 119/54 47/21

048 208/230-1-60, 208/230-3-60, 460-3-60 340 155 84/38 70/32 133/60 53/24

060 208/230-1-60, 208/230-3-60 359 163 65/30 99/45 120/55 75/34

UNIT

50SX CENTER OF GRAVITY (in./mm)

XYZ

042 21.0/533 20.1/510 15.4/390

048 21.8/553 19.7/499 15.4/390

060 22.2/565 19.8/503 13.4/340

Fig. 8 — Dimensions; Units 50SX042-060 Without Base Rail (cont)

9

Fig. 9 — Dimensions; Units 50SX042-060 With Optional Base Rail

10

REQUIRED CLEARANCES TO COMBUSTIBLE MATERIAL — in. (mm)

Unit Top ........................................14(356)

Duct Side of Unit ...................................2(51)

Side Opposite Ducts ...............................14(356)

Bottom of Unit .........................................0

Vertical Discharge First 12 in. (305) of Supply Duct ...........1(25)

NECESSARY REQUIRED CLEARANCES — in. (mm)

Between Units, Control Box Side .....................42(1067)

Unit and Ungrounded Surfaces, Control Box Side ...........36(914)

Unit and Block or Concrete Walls and Other Grounded

Surfaces, Control Box Side .........................42(1067)

REQUIRED CLEARANCES FOR SERVICING — in. (mm)

Evaporator Coil Access Side .........................30(762)

Control Box Access Side ............................30(762)

(Except for Necessary Requirements)

Unit Top ........................................36(914)

Side Opposite Ducts ...............................30(762)

NOTES:

1. Clearances must be maintained to prevent recirculation of air from outdoor-

fan discharge.

2. Dimensions in ( ) are in millimeters.

UNIT

50SX CENTER OF GRAVITY (in./mm)

XYZ

042 20.8/529 20.2/512 17.3/440

048 21.6/548 19.8/502 17.3/440

060 22.0/560 19.9/506 15.7/399

LEGEND

CG — Center of Gravity NEC — National Electrical Code

COND — Condenser REQ’D — Required

MAT’L — Material

UNIT

50SX ELECTRICAL

CHARACTERISTICS UNIT WT CORNER WT (Lb/Kg)

Lb Kg A B C D

042 208/230-1-60, 208/230-3-60, 460-3-60 329 150 89/40 64/29 124/56 52/24

048 208/230-1-60, 208/230-3-60, 460-3-60 360 164 89/40 75/34 138/63 58/26

060 208/230-1-60, 208/230-3-60 379 172 70/32 104/47 125/57 80/36

Fig. 9 — Dimensions; Units 50SX042-060 With Optional Base Rail (cont)

11

PART NUMBER ‘‘A’’

FLAT

CURB

CPRFCURB001A00 89[203]

CPRFCURB002A00 119[279]

CPRFCURB003A00 149[356]

NOTES:

1. Roof curb must be set up for unit being installed.

2. Seal strip must be applied as required for unit being installed.

3. Dimensions in [ ] are in millimeters.

4. Roof curb is made of 16 gage steel.

5. Attach ductwork to curb (flanges of duct rest on curb).

6. Service clearance 4 ft on each side.

7. direction of airflow.

8. Insulated panels, 1-in. thick, fiberglass 1-lb density.

Fig. 10 — Roof Curb Dimensions

12

RECEIVING AND INSTALLATION

Step 1 — Check Equipment

IDENTIFY UNIT — The unit model number and serial num-

ber are stamped on the unit identification plate. Check this

information against shipping papers.

INSPECT SHIPMENT — Inspect for shipping damage while

unit is still on shipping pallet. If unit appears to be damaged

or is torn loose from its anchorage, have it examined by trans-

portation inspectors before removal. Forward claim papers

directly to transportation company. Manufacturer is not re-

sponsible for any damage incurred in transit.

Check all items against shipping list. Immediately notify

the nearest Carrier Air Conditioning office if any item is

missing.

To prevent loss or damage, leave all parts in original pack-

ages until installation.

Step 2 — Provide Unit Support

ROOF CURB — Install accessory roof curb in accordance

with instructions shipped with curb. See Fig. 10. Install in-

sulation, cant strips, roofing, and flashing. Ductwork must

be attached to curb.

IMPORTANT: The gasketing of the unit to the roof

curb is critical for a watertight seal. Install gasketing

material supplied with the roof curb. Improperly ap-

plied gasketing also can result in air leaks and poor

unit performance.

Curb should be level to within

1

⁄

4

inch. This is necessary

for unit drain to function properly. Refer to accessory roof

curb installation instructions for additional information as

required.

SLAB MOUNT — Place the unit on a solid, level concrete

pad that is a minimum of 4 in. thick with 2 in. above grade.

The slab should extend approximately 2 in. beyond the cas-

ing on all 4 sides of the unit. Install a 6-in. gravel apron in

front of condenser-air inlet to prevent obstruction of airflow

by grass or shrubs. Do not secure the unit to the slab except

when required by local codes.

Step 3 — Provide Clearances — The required mini-

mum service clearances and clearances to combustibles are

shown in Fig. 2-9. Adequate ventilation and condenser air

must be provided.

The condenser fan pushes air through the condenser coil

and discharges it through louvers on the top cover, the deco-

rative grille, and the compressor access panel. Be sure that

the fan discharge does not recirculate to the condenser coil.

Do not locate the unit in either a corner or under an over-

head obstruction. The minimum clearance under a partial over-

hang (such as a normal house overhang) is 48 in. above the

unit top. The maximum horizontal extension of a partial over-

hang must not exceed 48 inches.

Do not restrict condenser airflow. An air restriction at

either the outdoor-air inlet or the fan discharge can be

detrimental to compressor life.

Do not place the unit where water, ice, or snow from

an overhang or roof will damage or flood the unit. Do not

install the unit on carpeting, tile, or other combustible ma-

terials. The unit may be installed on wood flooring or on

Class A, B, or C roof covering materials.

Step 4 — Rig and Place Unit — Use spreader bars

or crate top when rigging the unit. The units must be rigged

for lifting as shown in Fig. 11 and 12. Refer to Fig. 11 and

12 for rigging weights and Tables 1 and 2 for operating weights.

Use extreme caution to prevent damage when moving the

unit. Unit must remain in an upright position during all rig-

ging and moving operations.The unit must be level for proper

condensate drainage; the ground-level pad or accessory roof

curb must be level before setting the unit in place. When a

field-fabricated support is used, be sure that the support is

level and that it properly supports the unit.

UNITS WITHOUT BASE RAILS —Accessory rigging brack-

ets are recommended to be used for rigging. Install brackets

as follows:

Secure screws and paint protectors solidly against unit

basepan to hold lifting brackets in position.

Never use lifting brackets when the temperature is be-

low −10 F (−23 C).

Never exceed 200 lbs per bracket of lifting force.

Never use lifting brackets for lifting other models of air

conditioning units.

Lifting point should be directly over the unit center of

gravity.

1. Position brackets as close to the corners of unit as pos-

sible. Be sure brackets are well outside of center of grav-

ity. (See Fig. 2, 4, 6, 8, and 11.)

2. Position paint protectors and foam strips between screws

and painted surface of unit. Tighten screws until they make

contact with the paint protectors.

3. Secure device or hook of sufficient strength to hole in bracket

as shown in detail ‘‘A’’ of Fig. 11.

4. If wood top is available, use it for a spreader bar to pre-

vent straps from damaging unit. If wood top is not avail-

able, use spreader bars of sufficient length.

UNITS WITH OPTIONAL BASE RAILS — Keep unit up-

right and do not drop. Use spreader bars or top crate when

rigging unit. Rollers may be used to move unit across roof.

Level unit for proper condensate disposal. See Fig. 3, 5, 7,

and 9 for additional information. Lifting holes are provided

in base rails as shown in Fig. 12. Refer to rigging instruc-

tions on unit.

13

NOTICE TO RIGGERS

Hook rigging shackles through holes in lifting brackets, as shown in

Detail ‘‘A,’’ lifting brackets to be centered around the unit center of gravity. Use

wood top skid when rigging, to prevent rigging straps from damaging unit. All panels must be in place when rigging.

UNIT SIZE

50SS SHIPPING WEIGHT A B C

Lb Kg in. mm in. mm in. mm

018 260 118 36

3

⁄

4

934 18 457 24

1

⁄

8

613

024 289 131 36

3

⁄

4

934 16

3

⁄

4

426 24

1

⁄

8

613

030 306 139 36

3

⁄

4

934 16

5

⁄

16

415 24

1

⁄

8

613

036 322 146 36

3

⁄

4

934 16

1

⁄

4

412 24

1

⁄

8

613

042 333 151 36

3

⁄

4

934 16

7

⁄

16

416 28

1

⁄

8

714

048 384 174 36

3

⁄

4

934 16

1

⁄

4

412 34

1

⁄

8

867

060 411 186 36

3

⁄

4

934 16

1

⁄

4

412 34

1

⁄

8

867

UNIT SIZE

50SX SHIPPING WEIGHT A B C

Lb Kg in. mm in. mm in. mm

024 322 146 36

3

⁄

4

934 14

3

⁄

4

375 28

1

⁄

8

714

030 325 147 36

3

⁄

4

934 14

1

⁄

2

368 28

1

⁄

8

714

036 343 155 36

3

⁄

4

934 15

5

⁄

8

397 28

1

⁄

8

714

042 361 164 36

3

⁄

4

934 15

1

⁄

2

394 34

1

⁄

8

867

048 392 178 36

3

⁄

4

934 14

11

⁄

16

373 34

1

⁄

8

867

060 411 186 36

3

⁄

4

934 16

1

⁄

4

412 34

1

⁄

8

867

NOTICE TO RIGGERS

Hook rigging shackles through holes in lifting brackets, as shown in Detail ‘‘A,’’

lifting brackets to be centered around the unit center of gravity. Use wood top

skid when rigging, to prevent rigging straps from damaging unit. Remove 4 screws

to slide wood support through rectangular hole in rail.

UNIT SIZE

50SS

SHIPPING

WEIGHT ABC

Lb Kg in. mm in. mm in. mm

018 247 112 36.5 926.0 17.0 431 28.2 715

024 276 125 36.5 926.0 14.3 364 28.2 715

030 293 133 36.8 926.0 14.7 372 28.2 715

036 309 140 36.5 926.0 15.5 393 28.2 715

042 339 154 36.5 926.0 15.5 394 32.2 817

048 371 168 36.5 926.0 14.8 376 38.2 969

060 398 180 36.5 926.0 14.4 366 38.2 969

All panels must be in place when rigging.

UNIT SIZE

50SX

SHIPPING

WEIGHT ABC

Lb Kg in. mm in. mm in. mm

024 309 140 36.5 926.0 15.0 380 32.2 817

030 312 141 36.5 926.0 14.8 376 32.2 817

036 330 150 36.5 926.0 15.8 402 32.2 817

042 348 158 36.5 926.0 15.6 397 38.2 969

048 379 172 36.5 926.0 14.9 378 38.2 969

060 398 180 36.5 926.0 14.4 366 38.2 969

Fig. 12 — Suggested Rigging for Units with Optional Base Rail

Fig. 11 — Suggested Rigging for Units Without Base Rail

14

Table 1 — Physical Data — Unit 50SS

UNIT 50SS 018 024 030 036 042 048 060

REFRIGERANT R-22

Metering Device Acutrol™ System

Charge (lb) 2.60 2.75 3.40 4.30 5.20 6.50 7.00

OPERATING WEIGHT (lb)

Without Base Rails 208 237 254 270 300 332 359

With Optional Base Rails 228 257 274 290 320 352 379

COMPRESSOR TYPE Rotary Reciprocating Reciprocating Reciprocating Reciprocating Scroll Scroll

EVAPORATOR FAN Centrifugal — Direct Drive

Speeds 2333222

Nominal Rpm 825 1075 1100 1100 1100 1100 1100

Diameter (in.) 10 10 10 10 10 10 10

Width (in.) 9999999

Nominal Airflow (Cfm) 600 800 1000 1200 1400 1600 1995

Motor Hp

1

⁄

41

⁄

41

⁄

21

⁄

23

⁄

43

⁄

4

1

EVAPORATOR COIL

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

Face Area (sq ft) 1.83 2.29 2.29 3.06 3.60 4.44 4.44

CONDENSER FAN Propeller — Direct Drive

Cfm 1700 1700 1900 1900 1900 2400 2400

Nominal Rpm 850 850 1050 1050 1050 1050 1050

Diameter (in.) 18 18 18 18 18 20 20

Motor Hp

1

⁄

81

⁄

81

⁄

41

⁄

41

⁄

41

⁄

31

⁄

3

CONDENSER COIL

Rows...Fins/in. 1...17 1...17 2...17 2...17 2...17 2...17 2...17

Face Area (sq ft) 5.95 5.95 5.95 5.95 7.00 8.66 8.66

FILTER SIZE (in.)*

Throwaway 20x20 20x20 20x24 20x24 24x24 24x30 24x30

*Recommended field-supplied filters are 1 in. thick.

Table 2 — Physical Data — Unit 50SX

UNIT 50SX 024 030 036 042 048 060

REFRIGERANT R-22

Metering Device Acutrol™ System

Charge (lb) 3.9 4.5 5.4 5.7 5.8 6.5

OPERATING WEIGHT (lb)

Without Base Rails 270 273 291 309 340 359

With Optional Base Rails 290 293 311 329 360 379

COMPRESSOR TYPE Scroll

EVAPORATOR FAN Centrifugal — Direct Drive

Motor Type Std Std Std Std Std* ICM ICM

Speeds 33332Variable Variable

Nominal Rpm 1075 1075 1100 1100 1125 — —

Diameter (in.) 10 10 10 10 10 10 10

Width (in.) 99999 9 9

Nominal Airflow (Cfm) 800 1000 1200 1400 1600 1600 1995

Motor Hp

1

⁄

41

⁄

41

⁄

21

⁄

23

⁄

4

11

EVAPORATOR COIL

Rows...Fins/in. 2...15 3...15 4...15 3...15 4...15 4...15

Face Area (sq ft) 3.60 2.70 3.60 4.44 4.44 4.44

CONDENSER FAN Propeller — Direct Drive

Cfm 2200 2200 2200 2400 2400 2400

Nominal Rpm 1100 1100 1100 1100 1100 1050

Diameter (in.) 20 20 20 20 20 20

Motor Hp

1

⁄

41

⁄

41

⁄

41

⁄

41

⁄

41

⁄

3

CONDENSER COIL

Rows...Fins/in. 2...17 2...17 2...17 2...17 2...17 2...17

Face Area (sq ft) 7.00 7.00 7.00 8.66 8.66 8.66

FILTER SIZE (in.)†

Throwaway 24x24 24x24 24x24 24x30 24x30 24 x 30

LEGEND

ICM — Integrated Control Motor

*460 v only.

†Recommended field-supplied filters are 1 in. thick.

NOTE: Standard motors are non-integrated control motors.

15

Step 5 — Select and Install Ductwork — The de-

sign and installation of the duct system must be in accor-

dance with the standards of the NFPA (National Fire Protec-

tion Association) for installation of nonresidence-type air

conditioning and ventilating systems, NFPA 90A or residence-

type,NFPA90B;and/orlocalcodesandresidence-type,NFPA90B;

and/or local codes and ordinances.

Select and size ductwork, supply-air registers and

return-air grilles according to ASHRAE (American Society

of Heating, Refrigeration, and Air Conditioning Engineers)

recommendations.

The unit has duct flanges on the supply- and return-air

openings on the side of the unit. See Fig. 2-9 for connection

sizes and locations.

When designing and installing ductwork, consider the

following:

When connecting ductwork to units, do not drill deeper

than

1

⁄

2

inch in shaded area shown in Fig. 13 or coil may

be damaged.

• All units should have field-supplied filters or accessory fil-

ter rack installed in the return-air side of the unit. Rec-

ommended sizes for filters are shown in Tables 1 and 2.

• Avoid abrupt duct size increases and reductions. Abrupt

change in duct size adversely affects air performance.

IMPORTANT: Use flexible connectors between

ductwork and unit to prevent transmission of vibra-

tion. Use suitable gaskets to ensure weathertight and

airtight seal. When electric heat is installed, use fire-

proof canvas (or similar heat resistant material) con-

nector between ductwork and unit discharge connec-

tion. If flexible duct is used, insert a sheet metal sleeve

inside duct. Heat resistant duct connector (or sheet metal

sleeve) should extend 24-in. from electric heater

element.

• Size ductwork for cooling air quantity (cfm). The mini-

mum air quantity for proper electric heater operation is

listed in Table 3. Heater limit switches may trip at air quan-

tities below those recommended.

• Insulate and weatherproof all external ductwork. Insulate

and cover with a vapor barrier all ductwork passing through

conditioned spaces. Follow latest Sheet Metal and Air Con-

ditioning Contractors National Association (SMACNA)

andAir Conditioning ContractorsAssociation (ACCA) mini-

mum installation standards for residential heating and air

conditioning systems.

• Secure all ducts to building structure. Flash, weather-

proof, and vibration-isolate duct openings in wall or roof

according to good construction practices.

Figure 14 shows a typical duct system with 50SS,SX

installed.

Table 3 — Minimum Airflow for Safe Electric

Heater Operation (Cfm)

SIZE

018* 024 030 036 042 048 060

700 700 875 1200 1225 1400 1750

*Unit 50SS only.

CONVERTING HORIZONTAL DISCHARGE UNITS TO

DOWNFLOW (VERTICAL) DISCHARGE — STD (Non-

Integrated Control Motor [Non-ICM] UNITS — Units are

shipped in a horizontal configuration. To convert a horizon-

tal unit for downflow (vertical) discharge, perform the fol-

lowing steps:

Before performing service or maintenance operations on

system, turn off main power to unit. Turn off accessory

heater power switch if applicable. Electrical shock can

cause personal injury.

1. Open all electrical disconnects before starting any serv-

ice work.

2. Remove evaporator coil access panel (Fig. 15).

3. Locate lances in basepan insulation that are placed over

the perimeter of the vertical duct opening cover

(Fig. 16).

4. Using a straight edge and sharp knife, cut and remove

the insulation around the perimeter of the cover. Re-

move the screws securing the cover to the basepan and

slide out the cover. Discard the cover (Fig. 17).

Fig. 13 — Area Not To Be Drilled

Power Wiring

Control Wiring

Condenser Airflow

Evaporator Airflow

*Separate disconnect per NEC

(National Electrical Code) required

for electric heater when single-

point connection is not used.

Fig. 14 — Typical Installation

16

5. Remove indoor blower access panel (Fig. 18).

6. Disconnect evaporator-fan motor leads from evaporator-

fan relay and unit contactor. Carefully disengage wire

tie containing evaporator-fan motor leads from the unit

control box (Fig. 19).

7. Remove screws (Fig. 20) securing evaporator blower hous-

ing to blower shelf and carefully slide out blower hous-

ing. There is a filler bracket attached to the blower shelf;

remove this filler bracket and retain for later use.

8. Locate lances in basepan insulation that are placed over

the perimeter of the vertical discharge opening cover

(Fig. 21).

9. Using a straight edge and sharp knife, cut the insulation

around the perimeter of the cover. Remove the screws

securing the cover to the basepan and slide out the cover

(Fig. 22). Discard the cover. Install filler bracket re-

moved in Step 7.

10. If unit ductwork is to be attached to vertical opening

flanges on the unit basepan (jackstand applications only),

do so at this time.

11. It is recommended that the basepan insulation around

the perimeter of the vertical opening be secured to the

basepan with aluminum tape to prevent the insulation

from tearing or bunching up when the blower housing is

installed in the vertical discharge position.

12. Orient blower housing for vertical airflow (blower mo-

tor adjacent to horizontal duct opening) and slide into

vertical opening making sure the flanges on the blower

side plates engage the tabs in the unit basepan.

Resistance will be felt as the blower housing contacts

the basepan insulation; this can be overcome by apply-

ing a slight force to the base of the blower. Continue

sliding blower in until hole in side plate flange aligns

with the hole in the basepan.

Secure using screw removed in Step 7. Reconnect

evaporator-fan motor leads and insert wire tie back into

unit control box (Fig. 19).

13. Cover the horizontal duct openings. Duct covers can be

ordered as an accessory or be field-fabricated as shown

in Fig. 23.

14. Reinstall the evaporator coil and indoor blower access

panels.

15. After completing unit installation, perform all safety checks

and power up unit.

ACCESS PANEL

(REMOVE SCREWS)

Fig. 15 — Evaporator Coil Access Panel Fig. 16 — Basepan Insulation Over

Vertical Duct Opening

Fig. 17 — Insulation and Cover Removed

from Vertical Duct Opening

17

CONVERTING HORIZONTAL DISCHARGE UNITS TO

DOWNFLOW (VERTICAL) DISCHARGE — ICM (Inte-

grated Control Motor) UNITS — Units are shipped in a hori-

zontal configuration. To convert a horizontal unit for down-

flow (vertical) discharge, perform the following steps:

Before performing service or maintenance operations on

system, turn off main power to unit. Turn off accessory

heater power switch if applicable. Electrical shock can

cause personal injury.

1. Open all electrical disconnects before starting any serv-

ice work.

2. Remove evaporator coil access panel (Fig. 15).

3. Locate lances in basepan insulation that are placed over

the perimeter of the vertical duct opening cover

(Fig. 16).

4. Using a straight edge and sharp knife, cut and remove

the insulation around the perimeter of the cover. Re-

move the screws securing the cover to the basepan and

slide out the cover. Discard the cover (Fig. 17).

5. Remove evaporator blower access panel (Fig. 18).

6. Remove screws (Fig. 20) securing evaporator blower hous-

ing to blower shelf and carefully slide out blower hous-

ing. Disconnect the plug assemblies (Fig. 24) from the

evaporator-fan motor. There is a filler bracket attached

to the blower shelf; remove this filler bracket and retain

for later use. (See Fig. 24).

INDOOR BLOWER ACCESS PANEL

(REMOVE SCREWS)

Fig. 18 — Indoor Blower Access Panel

RELAYCONTACTORWIRE TIE

Fig. 19 — Fan Motor Leads

Fig. 20 — Blower Shelf and Housing

Fig. 21 — Basepan Insulation Over

Vertical Discharge Opening

Fig. 22 — Insulation and Cover Removed

from Vertical Discharge Opening

18

7. Remove screws securing blower shelf to duct panel. Dis-

card the blower shelf.

8. Locate lances in basepan insulation that are placed over

the perimeter of the vertical discharge opening cover

(Fig. 21).

9. Using a straight edge and sharp knife, cut the insulation

around the perimeter of the cover. Remove the screws

securing the cover to the basepan and slide out the cover

(Fig. 22). Discard the cover. Install filler bracket re-

moved in Step 6.

10. If unit ductwork is to be attached to vertical opening

flanges on the unit basepan (jackstand applications only),

do so at this time.

11. It is recommended that the basepan insulation around

the perimeter of the vertical opening be secured to the

basepan with aluminum tape to prevent the insulation

from tearing or bunching up when the blower housing is

installed in the vertical discharge position.

12. Remove screws securing the high-voltage raceway to duct

panel. See Fig. 24. Temporarily place raceway on top of

unit until blower housing is installed.

13. Orient blower housing for vertical airflow (blower mo-

tor adjacent to horizontal duct opening). See Fig. 25.

Reconnect the plug assemblies. Slide blower housing into

vertical opening making sure the flanges on the blower

side plates engage the tabs in the unit basepan.

Resistance will be felt as the blower housing contacts

the basepan insulation; this can be overcome by apply-

ing a slight force to the base of the blower. Continue

sliding blower in until hole in side plate flange aligns

with the hole in the basepan. Secure using screws re-

moved in Step 6.

14. Reinstall the high-voltage raceway removed in Step 12.

15. Cover the horizontal duct openings. Duct covers can be

ordered as an accessory or be field-fabricated.

16. Reinstall the evaporator coil and evaporator blower ac-

cess panels.

17. After completing unit installation, perform all safety checks

and power up unit.

NOTES:

1. An accessory duct cover is available as an alternative to field

fabrication.

2. Construct duct cover out of 22-gage sheet metal.

3. Dimensions in ( ) are in millimeters.

Fig. 23 — Field-Fabricated Duct Cover

19

ACCESSORY DUCT FLANGE KIT INSTALLATION —

Refer to Fig. 26 for duct adapter dimensions and hole

locations.

1. Mark hole locations shown in Fig. 26.

2. At marked locations, drill holes using a no. 26 (.147-in.)

twist drill.

3. Partially secure duct flanges using two of the no. 10,

1

⁄

2

-in.

screws provided.

4. See the following caution. Using remaining holes in duct

flanges as templates, drill the remaining holes with the

no. 26 (.147-in.) drill.

Do not drill deeper than

1

⁄

2

-in. into shaded area shown

in Fig. 26. Damage to refrigerant coil could result.

5. Fully secure the duct flanges using the remaining screws

provided.

The finished kit installation accommodates a 14

3

⁄

4

-in. x

14

3

⁄

4

-in. duct.

Step 6 — Provide for Condensate Disposal

NOTE: Be sure that condensate-water disposal methods com-

ply with local codes, restrictions, and practices.

Unit disposes of condensate through a

3

⁄

4

-in. NPT fitting

which exits through the compressor access panel. See

Fig. 2-9 for location of condensate connection.

Condensate water can be drained directly onto the roof in

rooftop installations (where permitted) or onto a gravel apron

in ground-level installations. Install a field-supplied conden-

sate trap at end of condensate connection to ensure proper

drainage. Make sure that the outlet of the trap is at least

1 in. lower than the drain-pan condensate connection to pre-

vent the pan from overflowing. See Fig. 27. Prime the trap

with water. When using a gravel apron, make sure it slopes

away from the unit.

If the installation requires draining the condensate water

away from the unit, install a 2-in. trap using a

3

⁄

4

-in. FPT

connection. See Fig. 27. Make sure that the outlet of the trap

is at least 1 in. lower than the unit drain-pan condensate con-

nection to prevent the pan from overflowing. Prime the trap

with water. Connect a drain tube using a minimum of

3

⁄

4

-in.

PVC,

3

⁄

4

-in. CPVC, or

3

⁄

4

-in. copper pipe (all field supplied).

Do not undersize the tube. Pitch the drain tube downward at

a slope of at least 1 in. for every 10 ft of horizontal run. Be

sure to check the drain tube for leaks. Prime trap at the be-

ginning of the cooling season start-up.

PLUG ASSEMBLIES

RACEWAY

FILLER

BRACKET

BLOWER

SHELF

Fig. 24 — Filler Bracket and Blower Shelf

HORIZONTAL DUCT OPENING

Fig. 25 — Housing Placed for Vertical Airflow

NOTE: Do not drill more than

1

⁄

2

-in. deep in shaded area.

Fig. 26 — Duct Flange Kit — Locating Holes

(Typical)

20

Step 7 — Install Electrical Connections

The unit cabinet must have an uninterrupted, unbroken

electrical ground to minimize the possibility of personal

injury if an electrical fault should occur. This ground

may consist of an electrical wire connected to the unit

wire-binding screw in the control compartment, or con-

duit approved for electrical ground when installed in ac-

cordance with NEC (National Electrical Code), ANSI/

NFPA (latest edition) (in Canada, Canadian Electrical

Code CSA C22.1) and local electrical codes. Failure to

adhere to this warning could result in personal injury or

death.

Failure to follow these precautions could result in dam-

age to the unit being installed:

1. Make all electrical connections in accordance with

NEC ANSI/NFPA (latest edition) and local elec-

trical codes governing such wiring. In Canada, all

electrical connections must be in accordance with CSA

Standard C22.1 Canadian Electrical Code Part 1

and applicable local codes. Refer to unit wiring

diagram.

2. Use only copper conductor for connections between

field-supplied electrical disconnect switch and unit.

DO NOT USE ALUMINUM WIRE.

3. Be sure that high-voltage power to unit is within op-

erating voltage range indicated on unit rating plate.

On 3-phase units, ensure that phases are balanced within

2%. Consult local power company for correction of

improper voltage and/or phase imbalance.

4. Insulate low-voltage wires for highest voltage con-

tained within conduit when low-voltage control wires

are run in same conduit as high-voltage wires.

5. Do not damage internal components when drilling

through any panel to mount electrical hardware, con-

duit, etc.

HIGH-VOLTAGE CONNECTIONS — The unit must have

a separate electrical service with a field-supplied, water-

proof disconnect switch mounted at, or within sight from the

unit. Refer to the unit rating plate for maximum fuse/circuit

breaker size and minimum circuit amps (ampacity) for wire

sizing. See Tables 4A and 4B for electrical data.

The field-supplied disconnect may be mounted on the unit

over the high-voltage inlet hole. See Fig. 2-9.

If the unit has an electric heater, a second disconnect may

be required. Consult the Installation, Start-Up and Service

Instructions provided with the accessory for electrical serv-

ice connections.

Operation of unit on improper line voltage constitutes

abuse and may cause unit damage that could affect

warranty.

ROUTING POWER LEADS INTO UNIT — Use only cop-

per wire between disconnect and unit. The high-voltage leads

should be in a conduit until they enter the duct panel; con-

duit termination at the duct panel must be watertight. Run

the high-voltage leads through the knockout on the duct panel

(see Fig. 28 for location and size). When the leads are inside

the unit, run leads up the high-voltage raceway to the line

wiring splice box (Fig. 29). For single-phase units, connect

leads to the black and yellow wires; for 3-phase units,

connect the leads to the black, yellow, and blue wires (see

Fig. 30).

CONNECTING GROUND LEAD TO WIRE-BINDING

SCREW — Refer to Fig. 29 and 30. Connect the ground

lead to the chassis using the wire-binding screw in the wir-

ing splice box.

ROUTING CONTROL POWER WIRES — STD NON-

ICM UNITS (24 v) — For all units except 50SS060, form

a drip-loop with the thermostat leads before routing them

into the unit. Route the thermostat leads through grommeted

hole provided in unit (see Fig. 28) into unit control power

splice box. Connect thermostat leads to unit control power

leads as shown in Fig. 31.

For 50SS060 units, remove knockout in the duct panel (see

Fig. 28).

Remove the rubber grommet from the installer’s packet

(included with unit) and install it in the knockout opening.

Route thermostat wires through grommet providing a drip

loop at the panel. Connect low-voltage leads to the thermo-

stat as shown in Fig. 31.

The unit transformer supplies 24-v power for complete

system including accessory electrical heater. Transformer is

factory wired for 230-v operation. If supply voltage is 208 v,

rewire transformer primary as described in the Special Pro-

cedures for 208-v Operation section on page 24.

Fig. 27 — Condensate Trap

21

Table 4A — Electrical Data — 50SS Units

UNIT SIZE

50SS V-PH-Hz VOLTAGE RANGE COMPRESSOR OUTDOOR-

FAN

MOTOR

INDOOR-

FAN

MOTOR POWER SUPPLY AWG 60C

MIN WIRE

SIZE

MAX WIRE

LENGTH (ft)

Min Max RLA LRA FLA FLA MCA MOCP*

018 208/230-1-60 187 253 8.3 45.0 0.7 1.8 12.0 15 14 75

024 208/230-1-60 187 253 12.4 61.0 0.7 2.0 18.2 30 12 80

030 208/230-1-60 187 253 14.4 82.0 1.4 2.3 21.8 30 10 100

208/230-3-60 187 253 9.4 65.5 1.4 2.3 15.5 25 12 80

036

208/230-1-60 187 253 18.0 96.0 1.4 2.8 26.7 40 10 90

208/230-3-60 187 253 11.7 75.0 1.4 2.8 18.8 30 12 65

460-3-60 414 506 5.6 40.0 0.8 1.4 9.2 10 14 100

042

208/230-1-60 187 253 20.4 104.0 1.4 4.0 30.9 50 8 100

208/230-3-60 187 253 14.0 91.0 1.4 4.0 22.9 35 10 85

460-3-60 414 506 6.4 42.0 0.8 2.0 10.8 15 14 100

048

208/230-1-60† 187 253 21.8 124.0 2.1 5.0 40.1 60 6 100

208/230-1-60** 187 253 26.4 129.0 2.1 5.0 40.1 60 6 100

208/230-3-60† 187 253 12.8 93.0 2.1 5.0 23.1 35 10 75

208/230-3-60** 187 253 15.0 99.0 2.1 5.0 25.9 40 10 75

460-3-60† 414 506 16.0 125.0 2.1 6.8 33.0 40 8 90

460-3-60** 414 506 19.3 123.0 2.1 6.8 33.0 50 8 90

060

208/230-1-60† 187 253 28.9 165.0 2.1 6.8 49.0 60 6 100

208/230-1-60** 187 253 32.1 169.0 2.1 6.8 49.0 60 6 100

208/230-3-60† 187 253 6.4 46.5 1.1 2.3 11.4 15 14 100

208/230-3-60** 187 253 8.2 49.5 1.1 2.3 13.7 20 14 100

460-3-60† 414 506 8.0 66.5 1.1 3.2 16.8 20 12 100

460-3-60** 414 506 10.0 62.0 1.1 3.2 16.8 25 12 100

LEGEND

AWG — American Wire Gage

BRKR — Breaker

CUL — Canadian Underwriters’ Laboratories

FLA — Full Load Amps

HACR — Heating, Air Conditioning and

Refrigeration

LRA — Locked Rotor Amps

MCA — Minimum Circuit Amps

MOCP — Maximum Overcurrent Protection

NEC — National Electrical Code

RLA — Rated Load Amps

*Fuse or HACR Breaker.

†Carrier Scroll Compressor.

**Copeland Scroll Compressor.

NOTES:

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

nation load equipment (refer to NEC Articles 430 and 440), the

overcurrent protective device for the unit shall be fuse or HACR

breaker. The CUL units may be fuse or circuit breaker.

2. Minimum wire size is based on 60 C copper wire. If other than

60 C wire is used, or if length exceeds wire length in table, de-

termine size from NEC.

3. Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance in supply volt-

age is greater than 2%.

Use the following formula to determine

the percentage of voltage imbalance.

% Voltage Imbalance

max voltage deviation from average voltage

= 100 x average voltage

EXAMPLE: Supply voltage is 460-3-60.

AB = 452 v

BC = 464 v

AC = 455 v

452 + 464 + 455

Average Voltage = 3

1371

=3

= 457

Determine maximum deviation from average voltage.

(AB) 457 – 452=5v

(BC) 464 – 457=7v

(AC) 457 – 455=2v

Maximum deviation is 7 v.

Determine percent of voltage imbalance.

7

% Voltage Imbalance = 100 x 457

= 1.53%

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

maximum allowable 2%.

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

contact your local electric utility company immediately.

22

Table 4B — Electrical Data — 50SX Units

UNIT SIZE

50SX V-PH-Hz VOLTAGE RANGE COMPRESSOR OUTDOOR-

FAN

MOTOR

INDOOR-

FAN

MOTOR POWER SUPPLY AWG 60C

MIN WIRE

SIZE

MAX WIRE

LENGTH (ft)

Min Max RLA LRA FLA FLA MCA MOCP*

024 208/230-1-60 187 253 12.9 62.5 1.4 2.0 19.5 30 12 75

030 208/230-1-60 187 253 15.0 76.0 1.4 2.6 22.8 30 10 100

036

208/230-1-60 187 253 16.7 95.0 1.4 2.8 25.1 30 10 95

208/230-3-60 187 253 10.9 75.0 1.4 2.8 17.8 25 12 70

460-3-60 414 506 5.4 40.0 0.8 1.4 9.0 10 14 100

042

208/230-1-60 187 253 20.0 104.0 1.4 3.1 29.5 45 10 80

208/230-3-60 187 253 13.9 88.0 1.4 3.1 21.9 30 10 60

460-3-60 414 506 6.8 44.0 0.8 1.6 10.9 15 14 100

048

208/230-1-60 187 253 26.4 129.0 1.4 7.2 41.6 60 6 100

208/230-3-60 187 253 15.0 99.0 1.4 7.2 27.4 40 10 70

460-3-60 414 506 8.2 49.5 0.8 2.3 13.4 20 14 100

060 208/230-1-60 187 253 32.1 169.0 2.1 7.2 49.4 60 6 100

208/230-3-60 187 253 19.3 123.0 2.1 7.2 33.4 50 8 90

LEGEND

AWG — American Wire Gage

BRKR — Breaker

CUL — Canadian Underwriters’ Laboratories

FLA — Full Load Amps

HACR — Heating, Air Conditioning and

Refrigeration

LRA — Locked Rotor Amps

MCA — Minimum Circuit Amps

MOCP — Maximum Overcurrent Protection

NEC — National Electrical Code

RLA — Rated Load Amps

*Fuse or HACR Breaker.

†Carrier Scroll Compressor.

**Copeland Scroll Compressor.

NOTES:

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

nation load equipment (refer to NEC Articles 430 and 440), the

overcurrent protective device for the unit shall be fuse or HACR

breaker. The CUL units may be fuse or circuit breaker.

2. Minimum wire size is based on 60 C copper wire. If other than

60 C wire is used, or if length exceeds wire length in table, de-

termine size from NEC.

3. Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance in supply volt-

age is greater than 2%.

Use the following formula to determine

the percentage of voltage imbalance.

% Voltage Imbalance

max voltage deviation from average voltage

= 100 x average voltage

EXAMPLE: Supply voltage is 460-3-60.

AB = 452 v

BC = 464 v

AC = 455 v

452 + 464 + 455

Average Voltage = 3

1371

=3

= 457

Determine maximum deviation from average voltage.

(AB) 457 – 452=5v

(BC) 464 – 457=7v

(AC) 457 – 455=2v

Maximum deviation is 7 v.

Determine percent of voltage imbalance.

7

% Voltage Imbalance = 100 x 457

= 1.53%

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

maximum allowable 2%.

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

contact your local electric utility company immediately.

23

ROUTING CONTROL POWER WIRES — ICM UNITS

(24 v) — Remove knockout in the duct panel (see Fig. 28).

Remove the rubber grommet from the installer’s packet (in-

cluded with unit) and install it in the knockout opening. Route

thermostat wires through grommet providing a drip loop at

the panel. Connect low-voltage leads to the thermostat as

shown in Fig. 31-34.

The Easy Select interface board is located in the return-air

section and is attached to the duct panel. The Easy Select

interface board is factory wired to the motor and factory de-

fault selections are preset.

SPECIAL PROCEDURES FOR 208-V OPERATION

Make sure that the power supply to the unit is switched

OFF before making any wiring changes. Electrical shock

can cause personal injury or death.

1. Disconnect the orange transformer-primary lead from the

contactor. See unit wiring label.

2. Remove the wirenut from the terminal on the end of the

red transformer-primary lead.

3. Save the wirenut.

4. Connect the red lead to the contactor terminal from which

the orange lead was disconnected.

5. Using the wirenut removed from the red lead, insulate

the loose terminal on the orange lead.

6. Wrap the wirenut with electrical tape so that the metal

terminal cannot be seen.

Indoor blower-motor speeds may need to be changed for

208-v operation. Refer to Indoor Airflow and Airflow Ad-

justments section on page 34.

1 3/8″ DIA.

1 1/8″ DIA.

HIGH

VOLTAGE

POWER

ENTRY

(KNOCKOUT)

2″ DIA.

2″ DIA.

7/8″ DIA.

CONTROL

POWER

ENTRY*

*Knockout on rectangular-duct panel units; entry hole on round-duct

panel units.

NOTE: For rectangular duct knockout sizes, see Fig. 2-9.

Fig. 28 — Typical Duct Panel Knockouts

UNIT LINE WIRE

SPLICE BOX

UNIT POWER

LEAD WIRE-BINDING

SCREW

CONTROL POWER

SPLICE BOX

Fig. 29 — Wiring Splice Boxes

Field Wiring

Splice Connections

NEC — National Electrical Code

NOTE: Use copper wire only.

Fig. 30 — Line Power Connections

Fig. 31 — Control Connections

24

LEGEND

IFO — Indoor Fan On

JW — Jumper Wire

C—Contactor, Compressor

COM — Common

CTD — Compressor Time Delay

FU — Fuse

HR — Heater Relay

ICM — Integrated Control Motor

IFO — Indoor Fan On

PL — Plug

TRAN — Transformer

Field Splice

Terminal (Marked)

Fig. 33 — Units 50SX048,060 — 208/230-1-60, Integrated Control Motor Wiring Schematic

Fig. 32 — Easy Select Interface Board

LEGEND

Terminal (Unmarked)

Terminal Block

Splice

Factory Wiring

Field Control Wiring

Field Power Wiring

Accessory or Optional Wiring

To Represent Common Potential Only.

Not to Represent Wiring

25

PRE-START-UP

Failure to observe the following warnings could result

in serious personal injury:

1. Follow recognized safety practices and wear protec-

tive goggles when checking or servicing refrigerant

system.

2. Do not operate compressor or provide any electric

power to unit unless compressor terminal cover is in

place and secured.

3. Do not remove compressor terminal cover until all

electrical sources are disconnected.

4. Relieve all pressure from both high- and low-

pressure sides of the system before touching or dis-

turbing anything inside terminal box if refrigerant leak

is suspected around compressor terminals. Use ac-

cepted methods to recover refrigerant.

5. Never attempt to repair soldered connection while re-

frigerant system is under pressure.

6. Do not use torch to remove any component. System

contains oil and refrigerant under pressure. To re-

move a component, wear protective goggles and pro-

ceed as follows:

a. Shut off electrical power to unit.

b. Relieve all pressure from system using both high-

and low-pressure ports. Use accepted methods to

recover refrigerant.

c. Cut component connecting tubing with tubing cut-

ter and remove component from unit.

d. Carefully unsweat remaining tubing stubs when

necessary. Oil can ignite when exposed to torch

flame.

Use the Start-Up Checklist supplied at the end of this book

and proceed as follows to inspect and prepare the unit for

initial start-up:

1. Remove all access panels.

2. Read and follow instructions on all WARNING, CAU-

TION, and INFORMATION labels attached to, or shipped

with, unit.

Make the following inspections:

a. Inspect for shipping and handling damages such as bro-

ken lines, loose parts, disconnected wires, etc.

b. Inspect for oil at all refrigerant tubing connections and

on unit base. Detecting oil generally indicates a re-

frigerant leak. Leak-test all refrigerant tubing connec-

tions using electronic leak detector, or liquid-soap so-

lution. If a refrigerant leak is detected, see following

Check for Refrigerant Leaks section.

c. Inspect all field- and factory-wiring connections. Be

sure that connections are completed and tight.

d. Inspect coil fins. If damaged during shipping and han-

dling, carefully straighten fins with a fin comb.

3. Verify the following conditions:

a. Make sure that outdoor-fan blade is correctly posi-

tioned in fan orifice. Leading edge of blade should be

2 in. back from condenser inlet grille or

1

⁄

2

in. maxi-

mum from fan deck.

b. Make sure that air filter(s) is in place.

c. Make sure that condensate drain pan and trap are filled

with water to ensure proper drainage.

d. Make sure that all tools and miscellaneous loose parts

have been removed.

C—Contactor, Compressor

COM — Common

CTD — Compressor Time Delay

FU — Fuse

HR — Heater Relay

ICM — Integrated Control Motor

IFO — Indoor Fan On

PL — Plug

TRAN — Transformer

Field Splice

Terminal (Marked)

Fig. 34 — Unit 50SX048,060 — 208/230-3-60 Integrated Control Motor Wiring Schematic

Terminal (Unmarked)

Terminal Block

Splice

Factory Wiring

Field Control Wiring

Field Power Wiring

Accessory or Optional Wiring

To Indicate Common Potential Only.

Not to Represent Wiring

LEGEND

26

4. If the unit is equipped with a crankcase heater, start the

heater 24 hours before starting the unit. To start the heater

only, turn the thermostat to the OFF position and ener-

gize the electrical disconnect to the unit.

START-UP

Use the Start-Up Checklist supplied at the end of this book,

and proceed as follows:

Check for Refrigerant Leaks — Locate and repair

refrigerant leaks and charge the unit as follows:

1. Using both high- and low-pressure ports, locate leaks and

reclaim remaining refrigerant to relieve system

pressure.

2. Repair leak following accepted practices.

NOTE: Install a filter drier whenever the system has been

opened for repair.

3. Check system for leaks using an approved method.

4. Evacuate refrigerant system and reclaim refrigerant if no

additional leaks are found.

5. Charge unit with R-22 refrigerant, using a volumetric-

charging cylinder or accurate scale. Refer to unit rating

plate for required charge. Be sure to add extra refrigerant

to compensate for internal volume of filter drier.

Start-Up Cooling Section and Make

Adjustments

Complete the required procedures given in the Pre-

Start-Up section page 25 before starting the unit.

Do not jumper any safety devices when operating the

unit.

Do not operate the compressor when the outdoor tem-

perature is below 40 F (unless accessory low-ambient

kit is installed).

Do not rapid-cycle the compressor. Allow 5 minutes be-

tween ‘‘on’’ cycles to prevent compressor damage.

CHECKING COOLING CONTROL OPERATION — Start

and check the unit for proper cooling control operation as

follows:

1. Place room thermostat SYSTEM switch in OFF position.

Observe that blower motor starts when FAN switch is placed

in ON position and shuts down when FAN switch is placed

in AUTO. position.

2. Place SYSTEM switch in COOL position and FAN switch

in AUTO. position. Set cooling control below room tem-

perature. Observe that compressor, condenser fan, and evapo-

rator blower motors start. Observe that cooling cycle shuts

down when control setting is satisfied.

3. When using an automatic changeover room thermostat,

place both SYSTEM and FAN switches in AUTO. posi-

tions. Observe that unit operates in Cooling mode when

temperature control is set to ‘‘call for cooling’’ (below

room temperature).

IMPORTANT: Three-phase, scroll compressors in

the 50SS048,060 and 50SX036-060 units are

direction-oriented. These units must be checked to

ensure proper compressor 3-phase power lead ori-

entation. If not corrected within 5 minutes, the in-

ternal protector will shut off the compressor. The

3-phase power leads to the unit must be reversed to

correct rotation. When turning backwards, scroll com-

pressors emit elevated noise levels, and the differ-

ence between compressor suction and discharge

pressures may be dramatically lower than normal.

CHECKINGAND ADJUSTING REFRIGERANT CHARGE

— The refrigerant system is fully charged with R-22 refrig-

erant, and is tested and factory sealed.

NOTE: Adjustment of the refrigerant charge is not required

unless the unit is suspected of not having the proper R-22

charge.

A superheat charging label is attached to the outside of

the compressor access door. The label includes a ‘‘Superheat

Charging Table’’ and a ‘‘Required Suction-Tube Tempera-

ture (F)’’ chart.

An accurate superheat, thermocouple-, or thermistor-type

thermometer, a sling psychrometer, and a gage manifold are

required when using the superheat charging method for evalu-

ating the unit charge. Do not use mercury or small dial-type

thermometers, because they are not adequate for this type of

measurement.

When evaluating the refrigerant charge, an indicated ad-

justment to the specified factory charge must always be

very minimal. If a substantial adjustment is indicated,

an abnormal condition exists somewhere in the cooling

system, such as insufficient airflow across either coil or

both coils.

Proceed as follows:

1. Remove caps from low- and high-pressure service

fittings.

2. Using hoses with valve core depressors, attach low- and

high-pressure gage hoses to low- and high-pressure serv-

ice fittings, respectively.

3. Start unit in cooling mode and let unit run until system

pressures stabilize.

4. Measure and record the following:

a. Outdoor ambient-air temperature (F db).

b. Evaporator inlet-air temperature (F wb).

27

c. Suction-tube temperature (F) at low-side service

fitting.

d. Suction (low-side) pressure (psig).

5. Using ‘‘Superheat Charging Table,’’ compare outdoor-air

temperature (F db) with evaporator inlet-air temperature

(F wb) to determine desired system operating superheat

temperature. See Tables 5A-5I and 6A-6F.

6. Using ‘‘Required Suction-Tube Temperature (F)’’

table, compare desired superheat temperature with suc-

tion (low-side) operating pressure (psig) to determine proper

suction-tube temperature. See Table 7.

7. Compare actual suction-tube temperature with proper

suction-tube temperature. Using a tolerance of ±3° F, add

refrigerant if actual temperature is more than 3° F higher

than proper suction-tube temperature, or remove refrig-

erant if actual temperature is more than 3° F lower than

required suction-tube temperature.

NOTE: If the problem causing the inaccurate readings is a

refrigerant leak, refer to Check for Refrigerant Leaks sec-

tion on page 27.

Table 5A — Superheat Charging Table, 50SS018

TEMP (F)

AIR ENT

COND

EVAP AIR — CFM

600

Evap Air — Ewb (F)

54 56 58 60 62 64 66 68 70 72 74 76

65 SPH 17.3 18.5 19.6 20.8 24.2 27.7 28.5 29.3 29.3 29.3 29.3 29.3

70 SPH 13.8 14.9 16.1 17.3 20.7 24.1 25.7 27.3 27.3 27.3 27.3 27.3

75 SPH 10.2 11.4 12.5 13.7 17.1 20.6 22.9 25.2 25.2 25.2 25.2 25.2

80 SPH 8.2 8.8 9.5 10.2 13.6 17.0 20.1 23.1 23.9 24.1 25.4 26.1

85 SPH 6.1 6.2 6.5 6.6 10.0 13.5 17.3 21.1 22.6 24.1 25.6 27.1

90 SPH * * * 5.0 8.1 11.4 15.2 19.0 20.5 22.0 23.5 25.0

95 SPH ****6.29.413.2 17.0 18.5 20.0 21.5 23.0

100 SPH *****7.311.114.9 17.2 19.5 21.7 24.0

105 SPH *****5.39.112.9 15.9 18.9 21.9 24.9

110 SPH ******6.710.8 13.8 16.8 19.8 22.8

115 SPH *******8.811.814.8 17.8 20.8

LEGEND

Ewb — Entering Wet Bulb

SPH — Superheat at Compressor (F)

*Do not attempt to charge system under these conditions — refrigerant slugging may occur.

Table 5B — Superheat Charging Table, 50SS024

TEMP (F)

AIR ENT

COND

EVAP AIR — CFM

800

Evap Air — Ewb (F)

54 56 58 60 62 64 66 68 70 72 74 76

65 SPH 18.2 19.0 19.9 20.7 22.5 24.2 25.1 25.9 26.6 27.2 27.9 28.6

70 SPH 17.1 17.6 18.1 18.6 20.4 22.1 23.0 23.9 24.9 26.0 27.1 28.1

75 SPH 16.0 16.2 16.4 16.6 18.3 20.1 21.0 21.8 23.3 24.8 26.2 27.7

80 SPH 14.8 14.7 14.6 14.5 16.3 18.0 19.7 21.3 22.4 23.5 24.6 25.8

85 SPH 13.7 13.3 12.9 12.5 14.3 16.0 18.4 20.7 21.5 22.3 23.1 23.8

90 SPH 11.1 10.9 10.7 10.4 12.2 13.9 16.3 18.7 19.9 21.0 22.2 23.4

95 SPH 8.5 8.4 8.4 8.4 10.1 11.9 14.3 16.6 18.2 19.8 21.4 23.0

100 SPH 7.3 7.5 7.7 7.9 8.9 9.9 12.2 14.6 16.6 18.6 20.6 22.6

105 SPH 6.2 6.6 6.9 7.3 7.6 7.8 10.2 12.5 14.9 17.3 19.7 22.1

110 SPH * * * 5.3 5.5 5.8 8.1 10.5 13.3 16.1 18.9 21.7

115 SPH ******6.18.411.614.9 18.1 21.3

LEGEND

Ewb — Entering Wet Bulb

SPH — Superheat at Compressor (F)

*Do not attempt to charge system under these conditions — refrigerant slugging may occur.

28

Table 5C — Superheat Charging Table, 50SS030

TEMP (F)

AIR ENT

COND

EVAP AIR — CFM

1000

Evap Air — Ewb (F)

54 56 58 60 62 64 66 68 70 72 74 76

65 SPH 14.2 15.1 16.1 17.1 19.2 21.3 23.3 24.7 25.9 27.2 27.8 28.5

70 SPH 13.6 14.1 14.6 15.0 17.1 19.2 21.3 22.8 24.2 25.7 26.3 26.9

75 SPH 13.0 13.0 13.0 13.0 15.1 17.2 19.2 20.9 22.6 24.2 24.8 25.4

80 SPH 10.9 11.0 11.0 10.9 13.6 16.1 18.7 20.1 21.4 22.7 23.6 24.4

85 SPH 8.9 8.9 8.9 8.9 12.0 15.1 18.2 19.2 20.2 21.2 22.4 23.5

90 SPH 8.3 8.4 8.4 8.3 10.9 13.6 16.2 17.7 19.2 20.8 21.6 22.5

95 SPH 7.8 7.8 7.8 7.8 9.9 12.0 14.1 16.1 18.2 20.2 20.9 21.7

100 SPH 7.3 7.3 7.3 7.3 9.3 11.4 13.6 15.6 17.6 19.7 20.2 20.7

105 SPH 6.7 6.7 6.7 6.7 8.8 10.9 13.0 15.0 17.1 19.1 19.4 19.8

110 SPH ****6.78.910.9 13.0 15.0 17.1 18.0 18.9

115 SPH *****6.88.910.9 13.0 15.0 16.5 18.0

LEGEND

Ewb — Entering Wet Bulb

SPH — Superheat at Compressor (F)

*Do not attempt to charge system under these conditions — refrigerant slugging may occur.

Table 5D — Superheat Charging Table, 50SS036

TEMP (F)

AIR ENT

COND

EVAP AIR — CFM

1200

Evap Air — Ewb (F)

54 56 58 60 62 64 66 68 70 72 74 76

65 SPH 8.4 8.4 8.4 8.4 12.5 16.7 18.7 20.7 22.0 23.4 24.8 26.1

70 SPH 5.0 5.0 5.0 5.0 9.0 13.1 15.9 18.6 20.0 21.3 22.7 24.0

75 SPH ****5.49.613.1 16.6 17.9 19.3 20.6 22.0

80 SPH **** * 6.010.3 14.5 15.9 17.3 18.6 20.0

85 SPH **** * * 7.512.5 13.9 15.2 16.5 17.9

90 SPH **** * * 5.410.4 12.5 14.6 16.8 18.8

95 SPH **** * * * 8.411.314.1 17.0 19.8

100 SPH **** * * * 6.410.0 13.5 17.1 20.7

105 SPH **** ****8.713.0 17.3 21.7

110 SPH **** ****9.312.4 15.6 18.7

115 SPH **** ****10.0 11.9 13.8 15.8

LEGEND

Ewb — Entering Wet Bulb

SPH — Superheat at Compressor (F)

*Do not attempt to charge system under these conditions — refrigerant slugging may occur.

Table 5E — Superheat Charging Table, 50SS042

TEMP (F)

AIR ENT

COND

EVAP AIR — CFM

1400

Evap Air — Ewb (F)

54 56 58 60 62 64 66 68 70 72 74 76

65 SPH 11.0 11.0 11.0 14.0 17.0 20.0 22.0 24.0 26.0 26.0 27.7 28.6

70 SPH 7.5 7.5 7.5 10.4 13.4 16.4 18.9 21.4 24.0 25.0 26.1 27.1

75 SPH * * * 6.9 9.9 12.9 15.9 18.9 21.9 23.2 24.4 25.7

80 SPH * * * 5.9 8.4 10.8 13.8 16.8 19.8 21.3 22.8 24.3

85 SPH * * * 5.0 6.9 8.8 11.8 14.8 17.8 19.5 21.1 22.8

90 SPH * * * * 6.0 6.8 10.2 13.7 17.3 18.6 20.0 21.4

95 SPH * * * * * 5.0 8.7 12.7 16.7 17.8 18.9 20.0

100 SPH ******6.510.5 14.6 16.4 18.2 20.0

105 SPH *******8.412.6 15.1 17.6 20.0

110 SPH *******8.012.0 14.2 16.4 18.6

115 SPH *******7.711.513.4 15.3 17.2

LEGEND

Ewb — Entering Wet Bulb

SPH — Superheat at Compressor (F)

29

Table 5F — Superheat Charging Table, 50SS048 (Carrier Scroll Compressor)

TEMP (F)

AIR ENT

COND

EVAP AIR — CFM

1600

Evap Air — Ewb (F)

54 56 58 60 62 64 66 68 70 72 74 76

65 SPH 15.5 15.5 15.6 15.6 17.6 19.6 21.6 22.8 24.0 25.2 25.2 25.3

70 SPH 11.7 11.8 11.8 11.8 13.9 16.0 18.0 20.1 22.2 24.3 24.3 24.3

75 SPH 8.0 8.0 8.0 8.0 10.2 12.3 14.5 17.4 20.4 23.3 23.3 23.3

80 SPH 6.0 6.0 6.0 6.0 8.7 11.3 13.9 16.3 18.6 20.9 21.5 22.0

85 SPH ****7.210.3 13.4 15.1 16.8 18.5 19.7 20.8

90 SPH ****5.67.79.912.4 15.0 17.6 18.7 19.8

95 SPH *****5.26.39.813.2 16.7 17.7 18.8

100 SPH ******5.89.112.5 15.8 17.1 18.4

105 SPH ******5.28.411.714.9 16.5 18.1

110 SPH ******6.28.811.414.0 15.9 17.8

115 SPH ******7.19.111.113.1 15.3 17.5

LEGEND

Ewb — Entering Wet Bulb

SPH — Superheat at Compressor (F)

*Do not attempt to charge system under these conditions — refrigerant slugging may occur.

Table 5G — Superheat Charging Table, 50SS048 (Copeland Scroll Compressor)

TEMP (F)

AIR ENT

COND

EVAP AIR — CFM

1600

Evap Air — Ewb (F)

54 56 58 60 62 64 66 68 70 72 74 76

65 SPH 19.0 19.0 19.0 19.0 21.7 24.3 26.0 27.7 27.9 28.2 28.4 28.6

70 SPH 15.4 15.4 15.4 15.4 18.1 20.8 22.5 24.1 25.1 26.1 27.1 28.1

75 SPH 11.9 11.9 11.9 11.9 14.6 17.2 18.9 20.6 22.3 24.0 25.8 27.5

80 SPH 8.4 8.4 8.4 8.4 11.0 13.7 15.4 17.0 19.5 22.0 24.5 27.0

85 SPH 5.0 5.0 5.0 5.0 7.5 10.1 11.8 13.5 16.7 20.0 23.2 26.4

90 SPH *****6.69.011.414.7 17.9 21.1 24.4

95 SPH ******6.29.412.6 15.9 19.1 22.3

100 SPH *******7.310.6 13.8 17.0 20.3

105 SPH *******5.38.511.815.0 18.2

110 SPH ********6.911.215.5 19.8

115 SPH ********5.310.6 16.0 21.3

LEGEND

Ewb — Entering Wet Bulb

SPH — Superheat at Compressor (F)

*Do not attempt to charge system under these conditions — refrigerant slugging may occur.

Table 5H — Superheat Charging Table, 50SS060 (Carrier Scroll Compressor)

TEMP (F)

AIR ENT

COND

EVAP AIR — CFM

1600

Evap Air — Ewb (F)

54 56 58 60 62 64 66 68 70 72 74 76

65 SPH 8.9 8.9 9.0 9.0 12.1 15.2 18.3 20.4 22.4 24.5 24.5 24.5

70 SPH 5.0 5.0 5.0 5.0 7.4 11.1 14.7 17.3 19.9 22.5 22.9 23.3

75 SPH **** * 6.911.214.3 17.3 20.4 21.3 22.1

80 SPH **** * * 5.69.413.1 16.8 18.4 19.9

85 SPH **** ****8.913.3 15.4 17.6

90 SPH **** ****6.411.313.3 15.3

95 SPH **** * * * * * 9.211.113.1

100 SPH **** *****7.29.712.3

105 SPH **** *****5.18.311.5

110 SPH **** ******6.910.8

115 SPH **** ******5.510.0

LEGEND

Ewb — Entering Wet Bulb

SPH — Superheat at Compressor (F)

*Do not attempt to charge system under these conditions — refrigerant slugging may occur.

30

Table 5I — Superheat Charging Table, 50SS060 (Copeland Scroll Compressor)

TEMP (F)

AIR ENT

COND

EVAP AIR — CFM

1995

Evap Air — Ewb (F)

54 56 58 60 62 64 66 68 70 72 74 76

65 SPH 20.1 20.1 20.1 20.1 20.1 20.1 22.6 25.2 25.6 26.1 26.6 27.0

70 SPH 16.5 16.5 16.5 16.5 17.3 18.0 20.6 23.1 24.0 24.8 25.6 26.5

75 SPH 13.0 13.0 13.0 13.0 14.5 16.0 18.5 21.1 22.3 23.5 24.7 25.9

80 SPH 10.9 10.9 10.9 10.9 12.4 13.9 16.5 19.0 20.6 22.2 23.8 25.4

85 SPH 8.9 8.9 8.9 8.9 10.4 11.9 14.4 17.0 18.9 20.9 22.9 24.9

90 SPH 6.9 6.9 6.9 6.9 8.4 9.9 12.4 14.9 17.3 19.6 22.0 24.3

95 SPH 5.0 5.0 5.0 5.0 6.3 7.8 10.3 12.9 15.6 18.3 21.1 23.8

100 SPH *****5.88.310.8 13.9 17.0 20.1 23.2

105 SPH ******6.28.812.3 15.7 19.2 22.7

110 SPH *******6.710.6 14.4 18.3 22.2

115 SPH ********8.913.1 17.4 21.6

LEGEND

Ewb — Entering Wet Bulb

SPH — Superheat at Compressor (F)

*Do not attempt to charge system under these conditions — refrigerant slugging may occur.

Table 6A — Superheat Charging Table, 50SX024

TEMP (F)

AIR ENT

COND

EVAP AIR — CFM

800

Evap Air — Ewb (F)

54 56 58 60 62 64 66 68 70 72 74 76

65 SPH 22.1 22.1 22.8 23.2 25.3 27.4 29.5 29.8 30.2 30.5 31.3 32.1

70 SPH 18.5 18.9 19.3 19.6 22.2 24.8 27.5 28.3 29.1 30.0 30.0 30.0

75 SPH 15.0 15.4 15.7 16.1 19.2 22.3 25.4 26.7 28.1 29.4 28.7 28.0

80 SPH 9.2 9.5 9.7 9.9 14.4 18.9 23.3 24.7 26.0 27.3 27.4 27.4

85 SPH ****9.615.5 21.3 22.6 24.0 25.3 26.1 26.8

90 SPH ****7.212.5 17.8 20.1 22.4 24.8 25.1 25.5

95 SPH *****9.414.2 17.5 20.9 24.2 24.2 24.2

100 SPH *****7.110.6 14.5 18.3 22.1 22.9 23.6

105 SPH ******7.111.415.8 20.1 21.6 23.1

110 SPH *******8.413.2 18.0 19.5 21.0

115 SPH *******5.310.7 16.0 17.5 19.0

LEGEND

Ewb — Entering Wet Bulb

SPH — Superheat at Compressor (F)

*Do not attempt to charge system under these conditions — refrigerant slugging may occur.

Table 6B — Superheat Charging Table, 50SX030

TEMP (F)

AIR ENT

COND

EVAP AIR — CFM

1000

Evap Air — Ewb (F)

54 56 58 60 62 64 66 68 70 72 74 76

65 SPH 11.2 11.2 11.2 11.2 14.9 18.6 22.3 22.4 22.5 22.7 22.9 23.1

70 SPH 7.6 7.7 7.7 7.7 12.1 16.6 21.1 21.6 22.0 22.4 22.5 22.5

75 SPH ****9.414.7 20.0 20.7 21.4 22.1 22.1 22.0

80 SPH ****8.513.5 18.5 19.3 20.2 21.0 21.6 22.1

85 SPH ****7.612.3 17.0 18.0 18.9 19.9 21.1 22.3

90 SPH *****10.0 14.2 16.0 17.8 19.6 20.7 21.8

95 SPH *****7.711.514.1 16.7 19.2 20.2 21.2

100 SPH * * * * * * 5.7 9.9 14.0 18.2 19.4 20.6

105 SPH *******5.711.417.1 18.6 20.1

110 SPH ********8.913.5 15.8 18.0

115 SPH *********10.0 13.0 16.0

LEGEND

Ewb — Entering Wet Bulb

SPH — Superheat at Compressor (F)

*Do not attempt to charge system under these conditions — refrigerant slugging may occur.

31

Table 6C — Superheat Charging Table, 50SX036

TEMP (F)

AIR ENT

COND

EVAP AIR — CFM

1200

Evap Air — Ewb (F)

54 56 58 60 62 64 66 68 70 72 74 76

65 SPH 21.3 21.3 21.3 21.3 22.0 22.6 23.3 23.5 23.7 23.8 23.3 22.8

70 SPH 19.3 19.3 19.3 19.3 20.2 21.2 22.2 22.3 22.5 22.6 22.0 21.5

75 SPH 17.2 17.2 17.2 17.2 18.5 19.7 21.0 21.1 21.3 21.4 20.7 20.1

80 SPH 13.6 13.6 13.6 13.6 15.1 16.6 18.0 18.5 18.9 19.3 19.4 19.5

85 SPH 10.1 10.1 10.1 10.1 11.7 13.4 15.0 15.8 16.5 17.3 18.1 19.0

90 SPH 6.5 6.5 6.5 6.5 8.8 11.2 13.5 14.6 15.7 16.8 17.2 17.6

95 SPH ****6.09.012.0 13.4 14.8 16.2 16.2 16.2

100 SPH ******6.08.711.414.1 14.9 15.6

105 SPH ********8.012.1 13.6 15.1

110 SPH *********10.0 11.5 13.0

115 SPH *********8.09.511.0

LEGEND

Ewb — Entering Wet Bulb

SPH — Superheat at Compressor (F)

*Do not attempt to charge system under these conditions — refrigerant slugging may occur.

Table 6D — Superheat Charging Table, 50SX042

TEMP (F)

AIR ENT

COND

EVAP AIR — CFM

1400

Evap Air — Ewb (F)

54 56 58 60 62 64 66 68 70 72 74 76

65 SPH 23.9 23.9 23.9 23.9 24.4 24.9 25.5 25.8 26.1 26.5 25.6 24.7

70 SPH 21.9 21.9 21.9 21.9 22.4 22.9 23.4 23.7 24.1 24.5 24.0 23.5

75 SPH 19.8 19.8 19.8 19.8 20.3 20.8 21.3 21.7 22.0 22.4 22.4 22.4

80 SPH 16.3 16.3 16.3 16.3 17.9 19.6 21.3 21.5 21.7 21.8 21.8 21.8

85 SPH 12.7 12.7 12.7 12.7 15.6 18.4 21.3 21.3 21.3 21.3 21.3 21.3

90 SPH 9.2 9.2 9.2 9.2 12.0 14.9 17.8 18.7 19.7 20.8 20.8 20.8

95 SPH 5.6 5.6 5.6 5.6 8.5 11.3 14.2 16.2 18.2 20.2 20.2 20.2

100 SPH *****8.010.6 13.1 15.6 18.1 18.9 19.6

105 SPH ******7.110.1 13.1 16.1 17.6 19.1

110 SPH *******7.010.5 14.0 15.5 17.0

115 SPH ********8.012.0 13.5 15.0

LEGEND

Ewb — Entering Wet Bulb

SPH — Superheat at Compressor (F)

*Do not attempt to charge system under these conditions — refrigerant slugging may occur.

Table 6E — Superheat Charging Table, 50SX048

TEMP (F)

AIR ENT

COND

EVAP AIR — CFM

1600

Evap Air — Ewb (F)

54 56 58 60 62 64 66 68 70 72 74 76

65 SPH 27.2 27.2 27.2 27.2 27.0 26.7 26.5 26.0 25.6 25.1 24.5 24.0

70 SPH 25.0 25.0 25.0 25.0 24.8 24.6 24.5 24.5 24.5 24.6 23.8 23.1

75 SPH 22.8 22.8 22.8 22.8 22.7 22.5 22.4 22.9 23.5 24.0 23.1 22.2

80 SPH 20.6 20.6 20.6 20.6 20.5 20.4 20.3 21.4 22.4 23.5 22.4 21.4

85 SPH 18.3 18.3 18.3 18.3 18.3 18.3 18.3 19.8 21.4 22.9 21.8 20.6

90 SPH 13.3 13.3 13.3 13.3 14.2 15.2 16.3 17.8 19.3 20.9 20.4 19.9

95 SPH 8.2 8.2 8.2 8.2 10.2 12.2 14.2 15.7 17.3 18.8 19.0 19.2

100 SPH ****6.38.410.6 12.9 15.2 17.5 18.1 18.7

105 SPH ******7.110.1 13.1 16.1 17.1 18.2

110 SPH *******7.110.5 14.0 15.3 16.6

115 SPH ********8.012.0 13.5 15.0

LEGEND

Ewb — Entering Wet Bulb

SPH — Superheat at Compressor (F)

*Do not attempt to charge system under these conditions — refrigerant slugging may occur.

32

Table 6F — Superheat Charging Table, 50SX060

TEMP (F)

AIR ENT

COND

EVAP AIR — CFM

1995

Evap Air — Ewb (F)

54 56 58 60 62 64 66 68 70 72 74 76

65 SPH 20.1 20.1 20.1 20.1 20.1 20.1 22.6 25.2 25.6 26.1 26.6 27.0

70 SPH 16.5 16.5 16.5 16.5 17.3 18.0 20.6 23.1 24.0 24.8 25.6 26.5

75 SPH 13.0 13.0 13.0 13.0 14.5 16.0 18.5 21.1 22.3 23.5 24.7 25.9

80 SPH 10.9 10.9 10.9 10.9 12.4 13.9 16.5 19.0 20.6 22.2 23.8 25.4

85 SPH 8.9 8.9 8.9 8.9 10.4 11.9 14.4 17.0 18.9 20.9 22.9 24.9

90 SPH 6.9 6.9 6.9 6.9 8.4 9.9 12.4 14.9 17.3 19.6 22.0 24.3

95 SPH 5.0 5.0 5.0 5.0 6.3 7.8 10.3 12.9 15.6 18.3 21.1 23.8

100 SPH *****5.88.310.8 13.9 17.0 20.1 23.2

105 SPH ******6.28.812.3 15.7 19.2 22.7

110 SPH *******6.710.6 14.4 18.3 22.2

115 SPH ********8.913.1 17.4 21.6

LEGEND

Ewb — Entering Wet Bulb

SPH — Superheat at Compressor (F)

*Do not attempt to charge system under these conditions — refrigerant slugging may occur.

Table 7 — Required Suction-Tube Temperature (F)*

SUPERHEAT

TEMP (F) SUCTION PRESSURE AT SERVICE PORT (psig)

61.5 64.2 67.1 70.0 73.0 76.0 79.2 82.4 85.7

035 37 39 41 43 45 47 49 51

237 39 41 43 45 47 49 51 53

439 41 43 45 47 49 51 53 55

641 43 45 47 49 51 53 55 57

843 45 47 49 51 53 55 57 59

10 45 47 49 51 53 55 57 59 61

12 47 49 51 53 55 57 59 61 63

14 49 51 53 55 57 59 61 63 65

16 51 53 55 57 59 61 63 65 67

18 53 55 57 59 61 63 65 67 69

20 55 57 59 61 63 65 67 69 71

22 57 59 61 63 65 67 69 71 73

24 59 61 63 65 67 69 71 73 75

26 61 63 65 67 69 71 73 75 77

28 63 65 67 69 71 73 75 77 79

30 65 67 69 71 73 75 77 79 81

32 67 69 71 73 75 77 79 81 83

34 69 71 73 75 77 79 81 83 85

36 71 73 75 77 79 81 83 85 87

38 73 75 77 79 81 83 85 87 89

40 75 77 79 81 83 85 87 89 91

*Temperature at suction service valve.

33

INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS

For cooling operation, the recommended airflow is

350 to 450 cfm per each 12,000 Btuh of rated cooling

capacity.

Tables 8-11 show airflows at several external static pres-

sures. Table 12 shows airflow for Fan Only and Cooling modes

for ICM units. Tables 13-15 show accompanying pressure

drops for wet coils, electric heaters, and filters. Refer to these

tables to determine the airflow for the system being

installed.

NOTE: Be sure that all supply- and return-air grilles are open,

free from obstructions, and adjusted properly.

Disconnect electrical power to the unit before changing

blower speed. Electrical shock can cause personal in-

jury or death.

Airflow can be changed by changing the lead connections

of the blower motor.

Unit 50SS two- or 3-speed motors are factory wired for

low speed operation. Units 50SX024, 036 and 048 (460 v)

two- or 3-speed motors are factory wired for low speed. Units

50SX030 and 042 are factory wired for medium speed.

For 208/230-v and A.O. Smith 460-v Blower Motors:

The motor leads are color-coded as follows:

3-SPEED 2-SPEED

black = high speed black = high speed

blue = medium speed red = low speed

red = low speed

To change the speed of the blower motor, remove the fan

motor speed leg lead from the indoor (evaporator) fan relay

(IFR) and replace with lead for desired blower motor speed.

Insulate the removed lead to avoid contact with chassis parts.

For 460-v GE Motors:

The motor leads are color coded as follows:

3-SPEED 2-SPEED

black = high black = high

blue = jumper blue = jumper

orange = medium red = low

red = low

To change the speed of the blower motor, remove red fan

motor speed lead from the indoor (evaporator) fan relay (IFR).

The motor speed lead is attached to terminal BM. Insulate

removed lead end to avoid contact with chassis parts. On

3-speed motors only, connect orange lead to IFR. To select

high speed, separate the black (female QC) from the blue

lead (male QC) and connect the black lead to IFR. Insulate

the blue lead to avoid contact with any chassis parts.

For Integrated Control Motors (ICM) — To configure the 50SX

unit, move the 5 Easy Select board wires to the terminals

which control the airflow. Refer to the Easy Select interface

board (Fig. 32) located next to the terminal and to Fig. 33

and 34.

Perform the following steps for basic system

configuration.

AUX HEAT RANGE (VIO)

NOTE: If no heater is installed, this step can be omitted.

The airflow for electric heat is selected with theAUX HEAT

RANGE terminals. Refer to Table 3 and the installation in-

structions for electric heaters for minimum airflow required

for safe heater operation. Refer to table below for the avail-

able airflows. Each select pin is configured for a certain air-

flow. The airflow will be supplied in the Heating mode on

air conditioners when electric heat is the primary heating source.

The preset factory default selection is the highest airflow.

TERMINAL 1234

Available

Airflow (Cfm) 1365 1470 1680 1840

AC/HP SIZE (BLU) — The preset factory default selection

for AC/HP SIZE (air conditioner/heat pump) is set to

400 cfm/ton. The selection pins are configured for 350 cfm/

ton and 400 cfm/ton.

TYPE (ORN) — The TYPE is a preset factory default se-

lection. The preset factory default setting isAC for the 50SX

units. Default setting should not be altered.

AC/HP CFM ADJUST (BLK) — The preset factory default

selection is MED. Selections HI and LO will adjust the air-

flow supplied for all operational modes (see table below).

The selection options allow installer to adjust airflow to meet

such individual needs as noise and static compensation, etc.

MODE FAN

ONLY COOLING HEATING

LO - Adjust −15% −10% −10%

HI - Adjust 15% 10% 10%

AC/HP TIME DELAY (GRY) — Four motor operation delay

options are provided to customize system operation. See list-

ing below:

OPTION DESCRIPTION

30-Sec On/60-Sec

Off Delay

Profile (Terminal 1)

Used when it is desirable to allow system

coils time to heat up or cool down prior to

airflow.

No Delay Option

(Terminal 2)

Used for servicing or when other compo-

nents are used to perform the delay

function.

30-Sec Off Delay

(Terminal 3) Preset factory default setting for 50SX

units.

45-Sec Off Delay

(Terminal 4) Enhances system efficiency.

UNIT CONTROLS — All compressors have the following

internal-protection controls.

High-Pressure Relief Valve — This valve opens when the

pressure differential between the low and high side becomes

excessive.

Compressor Overload — This overload interrupts power to

the compressor when either the current or internal tempera-

ture become excessive, and automatically resets when the

internal temperature drops to a safe level.

This overload may require up to 60 minutes (or longer) to

reset; therefore, if the internal overload is suspected of being

open, disconnect the electrical power to the unit and check

the circuit through the overload with an ohmmeter or con-

tinuity tester.

34

SEQUENCE OF OPERATION — STD NON-ICM UNITS

Cooling

NOTE: With the FAN switch in the ON position, 24 v is

supplied to the IFR through the G terminal on the thermo-

stat. This voltage energizes the coil of the contactor, closing

the normally-open set of contacts which provide continuous

power to the indoor (evaporator) fan motor (IFM). Moving

the FAN switch back to the AUTO. position, providing there

is not a call for cooling, deenergizes the IFR, opens the IFR

contacts, and deenergizes the IFM. The FAN switch in AUTO.

position cycles upon a call for cooling.

On a call for cooling, 24 v is supplied to the compressor

contactor (C) and IFR simultaneously through the Y and G

terminals of the thermostat, respectively. On units with a

compressor time delay relay, there is a built-in, 5-minute

(± 45 seconds) delay between compressor starts. Energizing

the contactor closes the normally-open set of contacts sup-

plying power to both the compressor and outdoor (con-

denser) fan motor (OFM). Energizing the IFR closes the

normally-open set of contacts providing power to the IFM.

On the loss of the call for cooling, 24 v is removed from

both the Y and G terminals of the thermostat (providing the

FAN switch is in the AUTO. position), deenergizing both

the contactor and IFR and opening both the contacts sup-

plying power to compressor/OFM and IFM.

Heating — If accessory electric heaters are installed, on a

call for heat, circuit R-W is made through the thermostat con-

tacts. Circuit R-G is made which energizes the IFR. If the

heaters are staged, then the thermostat closes a second set of

contacts W2 when second stage is required. When thermo-

stat is satisfied, contacts open, deenergizing the heater relay

and the IFR.

SEQUENCE OF OPERATION — ICM UNITS

Evaporator Fan — With the fan switch in the ON position,

24 v is supplied to the ICM motor through the ‘‘G’’ terminal

on the thermostat. This voltage provides continuous power

to the indoor (evaporator) fan motor (IFM). If the fan switch

is moved back to the AUTO position and there is not a call

for heating or cooling, 24 v is removed from the ‘‘G’’ ter-

minal and the evaporator fan remains energized for the de-

lay timing. When the fan switch is in AUTO, the fan cycles

with either the call for heating or cooling.

Cooling — On a call for cooling, 24 v is supplied to the com-

pressor contactor (C) and IFM simultaneously through the

‘‘Y’’ and ‘‘G’’ terminals of the thermostat. Energizing the

contactor closes the normally open set of contacts supplying

power to both the compressor and outdoor (condenser) fan

motor (OFM). On the loss of the call for cooling, 24 v is

removed from the ‘‘Y’’and ‘‘G’’ terminals of the thermostat,

deenergizing the compressor and OFM. The evaporator fan

remains energized for the delay timing.

NOTE: Once the compressor has started and then stopped,

it cannot be restarted again until 5 minutes have elapsed.

Heating — If accessory electric heaters are installed, on a

call for heat, circuits R-W and R-G are made through the

thermostat contacts, energizing the heater relay and IFM. If

the heaters are staged, then the thermostat closes the second

set of contacts, W2, when the second stage is required. When

the thermostat is satisfied, contacts open, deenergizing the

heater relay and the IFM.

35

Table 8 — Dry Coil Air Delivery* — Horizontal Discharge (Deduct 10% for 208 v) — Unit 50SS

UNIT

SIZE MOTOR

SPEED

230 AND 460 V HORIZONTAL DISCHARGE

External Static Pressure (in. wg)

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

018

Low Watts 230 225 220 210 195 170 —————

Cfm760745725695640540—————

High Watts ————270235200————

Cfm————850700450————

024

Low Watts 280 275 265 255 250 245 240 ————

Cfm820810755700660600560————

Med Watts 365 360 350 345 340 330 320 310 300 — —

Cfm 1025 1010 975 940 900 850 800 720 630 — —

High Watts — — 490 480 470 460 445 430 410 390 380

Cfm — — 1300 1255 1200 1150 1080 1005 915 790 620

030

Low Watts — 460 450 420 400 380 360 335 — — —

Cfm — 1240 1190 1125 1060 995 920 840 — — —

Med Watts — — — 480 460 435 410 375 — — —

Cfm — — — 1280 1200 1115 1020 910 — — —

High Watts —————560530510490460—

Cfm—————1270 1180 1080 1000 870 —

036

Low Watts 470 460 455 445 430 415 400 380 350 — —

Cfm 1280 1250 1230 1200 1150 1100 1050 980 890 — —

Med Watts 550 535 520 500 480 460 440 410 385 — —

Cfm 1500 1450 1400 1330 1270 1190 1120 1030 940 — —

High Watts ————625595550520500470425

Cfm————1540 1440 1325 1220 1110 1000 800

042

Low Watts 730 700 680 645 615 580 535 490 430 — —

Cfm 1620 1590 1550 1510 1460 1390 1310 1210 1050 — —

High Watts —————850800750700650610

Cfm—————1780 1670 1550 1400 1230 1050

048

Low Watts 1080 1040 1020 970 910 840 785 730 680 620 540

Cfm 2100 2090 2080 2060 1980 1900 1810 1710 1590 1450 1200

High Watts 1230 1190 1125 1060 1010 940 880 820 760 710 660

Cfm 2390 2340 2280 2210 2150 2030 1900 1770 1630 1480 1300

060

Low Watts 1150 1100 1050 1010 950 900 850 800 730 650 —

Cfm 2500 2410 2330 2260 2170 2080 1990 1880 1750 1580 —

High Watts —————117011101050 990 920 880

Cfm—————2470 2340 2200 2040 1870 1700

*Air delivery values are based on operating voltage of 230 v or

460 v, dry coil, without filter or electric heater. Deduct wet coil, filter,

and electric heater pressure drops to obtain external static pressure

available for ducting.

NOTES:

1. Do not operate the unit at a cooling airflow that is less than

350 cfm for each 12,000 Btuh of rated cooling capacity. Evapo-

rator coil frosting may occur at airflows below this point.

2. Dashes indicate portions of table that are beyond the blower mo-

tor capacity or are not recommended.

36

Table 9 — Dry Coil Air Delivery* — Vertical Discharge (Deduct 10% for 208 v) — Unit 50SS

UNIT

SIZE MOTOR

SPEED

230 AND 460 V VERTICAL DISCHARGE

External Static Pressure (in. wg)

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

018

Low Watts 230 225 220 210 195 170 —————

Cfm760745725695640540—————

High Watts ————270235200————

Cfm————850700450————

024

Low Watts 280 275 265 255 250 245 240 ————

Cfm820810755700660600560————

Med Watts 365 360 350 345 340 330 320 310 300 — —

Cfm 1025 1010 975 940 900 850 800 720 630 — —

High Watts — — 490 480 470 460 445 430 410 390 380

Cfm — — 1300 1255 1200 1150 1080 1005 915 790 620

030

Low Watts — 460 450 420 400 380 360 335 — — —

Cfm — 1240 1190 1125 1060 995 920 840 — — —

Med Watts — — — 480 460 435 410 375 — — —

Cfm — — — 1280 1200 1115 1020 910 — — —

High Watts —————560530510490460—

Cfm—————1270 1180 1080 1000 870 —

036

Low Watts 470 460 455 445 430 415 400 380 350 — —

Cfm 1280 1250 1230 1200 1150 1100 1050 980 890 — —

Med Watts 550 535 520 500 480 460 440 410 385 — —

Cfm 1500 1450 1400 1330 1270 1190 1120 1030 940 — —

High Watts ————625595550520500470425

Cfm————1540 1440 1325 1220 1110 1000 800

042

Low Watts 730 700 680 645 615 580 535 490 430 — —

Cfm 1620 1590 1550 1510 1460 1390 1310 1210 1050 — —

High Watts —————850800750700650610

Cfm—————1780 1670 1550 1400 1230 1050

048

Low Watts 1080 1040 1020 970 910 840 785 730 680 620 540

Cfm 2100 2090 2080 2060 1980 1900 1810 1710 1590 1450 1200

High Watts 1230 1190 1125 1060 1010 940 880 820 760 710 660

Cfm 2390 2340 2280 2210 2150 2030 1900 1770 1630 1480 1300

060

Low Watts 890 850 810 780 740 710 660 630 580 — —

Cfm 2500 2410 2330 2260 2170 2080 1970 1860 1700 — —

High Watts — — — 1000 960 910 870 830 790 750 —

Cfm — — — 2480 2370 2250 2120 2000 1850 1690 —

Table 10 — Dry-Coil Air Delivery* — Horizontal Discharge (Deduct 10% for 208 V) — Unit 50SX

UNIT

50SX MOTOR

SPEED AIR

DELIVERY

230 AND 460 VOLT HORIZONTAL DISCHARGE

External Static Pressure (in. wg)

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

024,

030

Low Watts 280 275 265 255 250 245 240 ————

Cfm 820810755700660600560————

Med Watts 365 360 350 345 340 330 320 310 300 — —

Cfm 1025 1010 975 940 900 850 800 720 630 — —

High Watts — — 490 480 470 460 445 430 410 390 380

Cfm — — 1300 1255 1200 1150 1080 1005 915 790 620

036

Low Watts 520 495 474 458 445 425 —————

Cfm 1375 1335 1290 1240 1200 1140 —————

Med Watts 575 560 535 510 480 460 440 425 — — —

Cfm 1520 1490 1450 1400 1380 1300 1200 1080 — — —

High Watts ————650614575540510480—

Cfm ————1560 1500 1380 1280 1170 1060 —

042

Low Watts 490 480 470 460 450 430 410 390 — — —

Cfm 1400 1380 1340 1300 1250 1200 1140 1070 — — —

Med Watts 590 580 560 545 525 505 480 450 420 — —

Cfm 1600 1560 1540 1470 1430 1360 1300 1220 1120 — —

High Watts —————700670640600560500

Cfm —————1780 1670 1600 1480 1340 1100

048†

Low Watts 1050 1000 970 930 870 810 750 680 600 — —

Cfm 1850 1830 1800 1785 1750 1700 1640 1500 1330 — —

High Watts — — — 1050 1000 930 870 810 740 665 —

Cfm — — — 2000 1940 1850 1750 1635 1500 1300 —

LEGEND AND NOTES FOR TABLES 9 AND 10

*Air delivery values are based on operating voltage of 230 v or

460 v, dry coil, without filter or electric heater. Deduct wet coil, filter,

and electric heater pressure drops to obtain external static pressure

available for ducting.

†Size 048 is 460 v.

NOTES:

1. Do not operate the unit at a cooling airflow that is less than

350 cfm for each 12,000 Btuh of rated cooling capacity. Evaporator-

coil frosting may occur at airflows below this point.

2. Dashes indicate portions of the table that are beyond the blower

motor capacity or are not recommended.

37

Table 11 — Dry-Coil Air Delivery* — Vertical Discharge (Deduct 10% for 208 V) — Unit 50SX

UNIT

SIZE

50SX

MOTOR

SPEED AIR

DELIVERY

230 AND 460 VOLT VERTICAL DISCHARGE

External Static Pressure (in. wg)

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

024,

030

Low Watts 280 275 265 255 250 245 240 ————

Cfm 820810755700660600560————

Med Watts 365 360 350 345 340 330 320 310 300 — —

Cfm 1025 1010 975 940 900 850 800 720 630 — —

High Watts — — 490 480 470 460 445 430 410 390 380

Cfm — — 1300 1255 1200 1150 1080 1005 915 790 620

036

Low Watts 520 495 474 458 445 425 —————

Cfm 1375 1335 1290 1240 1200 1140 —————

Med Watts 575 560 535 510 480 460 440 425 — — —

Cfm 1520 1490 1450 1400 1380 1300 1200 1080 — — —

High Watts ————650614575540510480—

Cfm ————1560 1500 1380 1280 1170 1060 —

042

Low Watts 490 480 470 460 450 430 410 390 — — —

Cfm 1400 1380 1340 1300 1250 1200 1140 1070 — — —

Med Watts 590 580 560 545 525 505 480 450 420 — —

Cfm 1600 1560 1540 1470 1430 1360 1300 1220 1120 — —

High Watts —————700670640600560500

Cfm —————1780 1670 1600 1480 1340 1100

048†

Low Watts 1050 1000 970 930 870 810 750 680 600 — —

Cfm 1850 1830 1800 1785 1750 1700 1640 1500 1330 — —

High Watts — — — 1050 1000 930 870 810 740 665 —

Cfm — — — 2000 1940 1850 1750 1635 1500 1300 —

*Air delivery values are based on operating voltage of 230 v or

460 v, dry coil, without filter or electric heater. Deduct wet coil, filter,

and electric heater pressure drops to obtain external static pressure

available for ducting.

†Size 048 is 460 v.

NOTES:

1. Do not operate the unit at a cooling airflow that is less than

350 cfm for each 12,000 Btuh of rated cooling capacity. Evapo-

rator coil frosting may occur at airflows below this point.

2. Dashes indicate portions of table that are beyond the blower mo-

tor capacity or are not recommended.

Table 12 — Dry-Coil Air Delivery* — Fan Only and

Cooling; Horizontal and Vertical Discharge for

Integrated Control Motor Units at 230 V

(Deduct 10% from Cfm for 208-V Operation)

UNIT 50SX FAN ONLY

(Cfm) COOLING

(Cfm)

048 1400 1600

060 1750 2000

*Air delivery values are for dry coil at 230 v. Airflow is independent of

external static pressure within 65% of table values up to

0.8 in. wg.

NOTE: Do not operate the unit at a cooling airflow that is less than

350 cfm for each 12,000 Btuh of rated cooling capacity. Evaporator-

coil icing may occur at airflows below this point. Water blow-off may

occur at airflows above 450 cfm per 12,000 Btuh of rated cooling

capacity.

38

Table 13 — Wet Coil Pressure Drop

UNIT SIZE AIRFLOW

(cfm) PRESSURE DROP

(in. wg)

018*

600 0.069

700 0.082

800 0.102

900 0.116

024

600 0.039

700 0.058

800 0.075

900 0.088

030

900 0.088

1000 0.095

1200 0.123

036

1000 0.068

1200 0.088

1400 0.108

1600 0.123

042

1000 0.048

1200 0.069

1400 0.088

1600 0.102

048

1400 0.068

1600 0.075

1800 0.088

060

1700 0.082

1900 0.095

2100 0.108

2300 0.123

*Unit 50SS only.

Table 14 — Accessory Electric Heater Pressure Drop (in. wg)

HEATER

kW CFM

600 800 1000 1200 1400 1600 1800 2000 2200

5-20 0.030 0.033 0.037 0.042 0.047 0.052 0.060 0.067 0.075

Table 15 — Filter Pressure Drop (in. wg)

UNIT

SIZE

50SS

FILTER

SIZE

(in.)

CFM

500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300

018, 024 20 x 20 0.05 0.07 0.08 0.10 0.12 0.13 — ————————————

030, 036 20x24—————0.10 0.11 0.13 0.14 ——————————

042 24x24————— — — —0.110.12 0.14 0.15 ———————

048, 060 24x30—————— — — — —0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.17 0.18

UNIT

SIZE

50SX

FILTER

SIZE

(in.)

CFM

500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300

024-036 24 x 24 — — 0.06 0.06 0.07 0.07 0.08 0.09 0.10 ——————————

042-060 24 x 30 — — — — — — — — 0.08 0.09 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.17 0.18

39

MAINTENANCE

To ensure continuing high performance, and to minimize

the possibility of premature equipment failure, periodic main-

tenance must be performed on this equipment. This cooling

unit should be inspected at least once each year by a quali-

fied service person. To troubleshoot cooling of units, refer to

Troubleshooting chart in back of book.

NOTE TO EQUIPMENT OWNER: Consult your local dealer

about the availability of a maintenance contract.

The ability to properly perform maintenance on this

equipment requires certain expertise, mechanical skills,

tools and equipment. If you do not possess these, do not

attempt to perform any maintenance on this

equipment, other than those procedures recommended

in the User’s Manual. FAILURE TO HEED THIS WARN-

ING COULD RESULT IN SERIOUS PERSONAL IN-

JURY AND POSSIBLE DAMAGE TO THIS EQUIP-

MENT.

The minimum maintenance requirements for this equip-

ment are as follows:

1. Inspect air filter(s) each month. Clean or replace when

necessary.

2. Inspect indoor coil, drain pan, and condensate drain each

cooling season for cleanliness. Clean when necessary.

3. Inspect blower motor and wheel for cleanliness and check

lubrication each cooling season. Clean and lubricate (if

required) when necessary. For first heating season, in-

spect blower wheel bimonthly to determine proper clean-

ing frequency.

4. Check electrical connections for tightness and controls

for proper operation each cooling season. Service when

necessary.

Failure to follow these warnings could result in serious

personal injury:

1. Turn off electrical power to the unit before perform-

ing any maintenance or service on the unit.

2. Use extreme caution when removing panels and parts.

As with any mechanical equipment, personal injury

can result from sharp edges.

3. Never place anything combustible either on, or in con-

tact with, the unit.

Air Filter

Never operate the unit without a suitable air filter in the

return-air duct system. Always replace the filter with the

same dimensional size and type as originally installed.

See Tables 1 and 2 for recommended filter sizes.

Inspect air filter(s) at least once each month and replace

(throwaway-type) or clean (cleanable-type) at least twice dur-

ing each cooling season or whenever the filters become clogged

with dust and lint.

Replace filters with the same dimensional size and type as

originally provided, when necessary.

Unit Top Removal

NOTE: When performing maintenance or service proce-

dures that require removal of the unit top, be sure to

perform all of the routine maintenance procedures that re-

quire top removal, including coil inspection and cleaning,

and condensate drain pan inspection and cleaning.

Only qualified service personnel should perform mainte-

nance and service procedures that require unit top removal.

Refer to the following top removal procedures:

1. Remove 7 screws on unit top cover surface. (Save all screws.)

2. Remove 4 screws on unit top cover flange. (Save all screws.)

3. Lift top from unit carefully. Set top on edge and make

sure that top is supported by unit side that is opposite

duct (or plenum) side.

4. Carefully replace and secure unit top to unit, using screws

removed in Steps 1 and 2, when maintenance and/or serv-

ice procedures are completed.

Evaporator Blower and Motor

NOTE: Motors without oilers are prelubricated. Do not at-

tempt to lubricate these motors.

For longer life, operating economy, and continuing effi-

ciency, clean accumulated dirt and grease from the blower

wheel and motor annually.

Lubricate the motor every 5 years if the motor is used in-

termittently (thermostat FAN switch in AUTO. position), or

every 2 years if the motor is used continuously (thermostat

FAN switch in ON position).

Disconnect and tag electrical power to the unit before

cleaning and lubricating the blower motor and wheel.

Failure to adhere to this warning could cause personal

injury or death.

To clean and lubricate the blower motor and wheel:

1. Remove and disassemble blower assembly as follows:

a. Remove blower access door.

b. For standard non-ICM units, disconnect motor lead from

IFR. Disconnect yellow motor lead from terminal L2

of the contactor.

c. Remove blower assembly from all units. Be careful

not to tear insulation in blower compartment.

d. Ensure proper reassembly by marking blower wheel

and motor in relation to blower housing before

disassembly.

e. Loosen setscrew(s) which secure wheel to motor shaft.

Remove screws that secure motor mount brackets to

housing and slide motor and motor mount out of

housing.

2. Lubricate motor as follows:

a. Thoroughly clean all accumulations of dirt or grease

from motor housing.

b. Remove dust caps or plugs from oil ports located at

each end of motor.

c. Use a good grade of SAE 20 nondetergent motor oil

and put one teaspoon (

1

⁄

16

oz. or 16 to 25 drops) in

each oil port.

d. Allow time for oil to be absorbed by each bearing,

then wipe excess oil from motor housing.

e. Replace dust caps or plugs in oil ports.

3. Remove and clean blower wheel as follows:

a. Ensure proper reassembly by marking wheel orienta-

tion and cutoff plate location.

b. Remove screws holding cut-off plate, and remove plate

from housing.

40

c. Lift wheel from housing. When handling and/or clean-

ing blower wheel, be sure not to disturb balance weights

(clips) on blower wheel vanes.

d. Remove caked-on dirt from wheel and housing with a

brush. Remove lint and/or dirt accumulations from wheel

and housing with vacuum cleaner, using soft brush at-

tachment. Remove grease and oil with mild solvent.

e. Reassemble wheel and cut-off plate into housing.

f. Reassemble motor into housing. Be sure setscrews are

tightened on motor-shaft flats and not on round part of

shaft.

Condenser Coil, Evaporator Coil, and Conden-

sate Drain Pan — Inspect the condenser coil, evapo-

rator coil, and condensate drain pan at least once each year.

Proper inspection and cleaning requires the removal of the

unit top. See Unit Top Removal section on page 40.

The coils are easily cleaned when dry; therefore, inspect

and clean the coils either before or after each cooling sea-

son. Remove all obstructions (including weeds and shrubs)

that interfere with the airflow through the condenser coil.

Straighten bent fins with a fin comb. If coated with dirt or

lint, clean the coils with a vacuum cleaner, using a soft brush

attachment. Be careful not to bend the fins. If coated with oil

or grease, clean the coils with a mild detergent-and-water

solution. Rinse coils with clear water, using a garden hose.

Be careful not to splash water on motors, insulation, wiring,

or air filter(s). For best results, spray condenser-coil fins from

inside to outside the unit. On units with an outer and inner

condenser coil, be sure to clean between the coils. Be sure

to flush all dirt and debris from the unit base.

Inspect the drain pan and condensate drain line when in-

specting the coils. Clean the drain pan and condensate drain

by removing all foreign matter from the pan. Flush the pan

and drain tube with clear water. Do not splash water on the

insulation, motor, wiring, or air filter(s). If the drain tube is

restricted, clear it with a ‘‘plumbers snake’’ or similar probe

device. Ensure that the auxiliary drain port above the drain

tube is also clear.

Condenser Fan

Keep the condenser fan free from all obstructions to en-

sure proper cooling operation. Never place articles on

top of the unit. Damage to unit may result.

1. Remove 2 screws at bottom of condenser air intake grille

and remove plastic grille.

2. Inspect the fan blades for cracks or bends.

3. If fan needs to be removed, loosen the setscrew and slide

the fan off the motor shaft.

4. When replacing fan blade, position blade so that lead-

ing edge is 2 in. back from condenser inlet grille or

1

⁄

2

in. maximum from fan deck. See Fig. 35.

5. Ensure that setscrew engages the flat area on the motor

shaft when tightening.

Electrical Controls and Wiring — Inspect and check

the electrical controls and wiring annually. Be sure to turn

off the electrical power to the unit.

Remove the control/blower and compressor compartment

access panels to locate all the electrical controls and wiring.

Check all electrical connections for tightness. Tighten

all screw connections. If any smoky or burned connections

are noticed, disassemble the connection, clean all the parts,

restrip the wire end and reassemble the connection properly

and securely.

After inspecting the electrical controls and wiring, re-

place all the panels. Start the unit, and observe at least one

complete cooling cycle to ensure proper operation. If dis-

crepancies are observed in operating cycle, or if a suspected

malfunction has occurred, check each electrical component

with the proper electrical instrumentation. Refer to the unit

wiring label when making these checkouts.

NOTE: Refer to the Cooling Sequence of Operation section

on page 35, as an aid in determining proper control

operation.

Refrigerant Circuit — Inspect all refrigerant tubing con-

nections and the unit base for oil accumulations annually.

Detecting oil generally indicates a refrigerant leak.

If oil is detected or if low cooling performance is sus-

pected, leak-test all refrigerant tubing using an electronic leak-

detector, or liquid-soap solution. If a refrigerant leak is

detected, refer to Check for Refrigerant Leaks section on

page 27.

If no refrigerant leaks are found and low cooling perfor-

mance is suspected, refer to Checking and Adjusting Refrig-

erant Charge section on page 27.

Evaporator Airflow — The cooling airflow does not

require checking unless improper performance is suspected.

If a problem exists, be sure that all supply- and return-air

grilles are open and free from obstructions, and that the air

filter is clean. When necessary, refer to Indoor Airflow and

Airflow Adjustments section on page 34 to check the system

airflow.

Metering Devices — Refrigerant metering devices are

fixed orifices and are located in the inlet header to the evapo-

rator coil.

Liquid Line Strainer — The liquid line strainer

(to protect metering device) is made of wire mesh and is

located in the liquid line on the inlet side of the metering

device.

Fig. 35 — Fan Blade Clearance

41

TROUBLESHOOTING COOLING CHART

SYMPTOM CAUSE REMEDY

Compressor and con-

denser fan will not

start.

Power failure Call power company.

Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker.

Defective thermostat, contactor, transformer,

or control relay Replace component.

Insufficient line voltage Determine cause and correct.

Incorrect or faulty wiring Check wiring diagram and rewire correctly.

Thermostat setting too high Lower thermostat setting below room temperature.

Single-phase units with scroll compressor

(50SS048,060 and 50SX) have a 5-minute time delay DO NOT bypass this compressor time delay — wait

for 5 minutes until time-delay relay is deenergized.

Compressor will not

start but condenser

fan runs.

Faulty wiring or loose connections in

compressor circuit Check wiring and repair or replace.

Compressor motor burned out, seized, or

internal overload open Determine cause. Replace compressor.

Defective run/start capacitor, overload,

or start relay Determine cause and replace.

One leg of 3-phase power dead Replace fuse or reset circuit breaker.

Determine cause.

Three-phase scroll

compressor

(50SS048, 060;

50SX036-060

units only) makes ex-

cessive noise, and

there may be a low

pressure differential.

Scroll compressor is rotating in the

wrong direction Correct the direction of rotation by reversing the

3-phase power leads to the unit.

Compressor cycles

(other than normally

satisfying thermostat).

Refrigerant overcharge or undercharge Reclaim refrigerant, evacuate system, and recharge

to capacities shown on nameplate.

Defective compressor Replace and determine cause.

Insufficient line voltage Determine cause and correct.

Blocked condenser Determine cause and correct.

Defective run/start capacitor, overload

or start relay Determine cause and replace.

Defective thermostat Replace thermostat.

Faulty condenser-fan motor or capacitor Replace.

Restriction in refrigerant system Locate restriction and remove.

Compressor operates

continuously. Dirty air filter Replace filter.

Unit undersized for load Decrease load or increase unit size.

Thermostat set too low Reset thermostat.

Low refrigerant charge Locate leak, repair and recharge.

Leaking valves in compressor Replace compressor.

Air in system Reclaim refrigerant, evacuate system and recharge.

Condenser coil dirty or restricted Clean coil or remove restriction.

Excessive head

pressure. Dirty air filter Replace filter.

Dirty condenser coil Clean coil.

Refrigerant overcharged Reclaim excess refrigerant.

Air in system Reclaim refrigerant, evacuate system and recharge.

Condenser air restricted or air short-cycling Determine cause and correct.

Head pressure too low. Low refrigerant charge Check for leaks, repair and recharge.

Compressor valves leaking Replace compressor.

Restriction in liquid tube Remove restriction.

Excessive suction

pressure. High heat load Check for source and eliminate.

Compressor valves leaking Replace compressor.

Refrigerant overcharged Reclaim excess refrigerant.

Suction pressure too

low. Dirty air filter Replace filter.

Low refrigerant charge Check for leaks, repair and recharge.

Metering device or low side restricted Remove source of restriction.

Insufficient evaporator airflow Increase air quantity. Check filter — replace if

necessary.

Temperature too low in conditioned area Reset thermostat.

Outdoor ambient below 40 F Install low-ambient kit.

Field-installed filter-drier restricted Replace.

42

TROUBLESHOOTING COOLING CHART (cont)

SYMPTOM CAUSE REMEDY

Integrated control motor

(units 50SX048 208/230 v

and 50SX060)

IFM does not run.

Blower wheel not secured to shaft. Properly tighten blower wheel to shaft.

Insufficient voltage at motor Determine cause and correct.

Power connectors not properly seated Connectors should snap easily; do not force.

Integrated control motor (units

50SX048 208/230 v

and 50SX060)

IFM runs when it should be off.

Motor programmed with a delay profile Allow a few minutes for motor to shut off.

With thermostat in OFF the voltage on

G,Y1,Y/Y2,W with respect to common,

should be less than

1

⁄

2

of actual low

voltage supply

If measured voltage is more than

1

⁄

2

, the ther-

mostat is incompatible with motor. If voltage is

less than

1

⁄

2

, the motor has failed.

Integrated control motor (units

50SX048 208/230 v

and 50SX060)

IFM operation is intermittent.

Water dripping into motor Verify proper drip loops in connector wires.

Connectors not firmly seated Gently pull wires individually to be sure they

are crimped into the housing.

IFM — Indoor (Evaporator) Fan Motor

43

PACKAGED SERVICE TRAINING

Our packaged service training programs provide an excellent way to increase your knowledge of the

equipment discussed in this manual. Product programs cover:

• Unit Familiarization

• Installation Overview • Maintenance

• Operating Sequence

A large selection of product, theory, and skills programs is available. All programs include a video

cassette and/or slides and a companion booklet. Use these for self teaching or to conduct full training

sessions.

For a free Service Training Material Catalog (STM), call 1-800-962-9212. Ordering instructions are

included.

Copyright 1995 Carrier Corporation

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

Book 1 4

Tab 1b 6b

PC 111 Catalog No. 535-022 Printed in U.S.A. Form 50SS,SX-4SI Pg 46 5-95 Replaces: 50SS,SX-3SI

START-UP CHECKLIST

(Remove and Store in Job File)

I. PRELIMINARY INFORMATION

MODEL NO.:

DATE:

SERIAL NO.:

TECHNICIAN:

II. PRE-START-UP (insert checkmark in box as each item is completed)

MVERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT

MREMOVE ALL SHIPPING HOLDDOWN BOLTS AND BRACKETS PER INSTALLATION INSTRUCTIONS

MVERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS

MCHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS

MCHECK THAT INDOOR AIR FILTER IS CLEAN AND IN PLACE

MVERIFY THAT UNIT INSTALLATION IS LEVEL

MCHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE AND SETSCREW

TIGHTNESS

III. START-UP

ELECTRICAL

SUPPLY VOLTAGE L1-L2 L2-L3 L3-L1

COMPRESSOR AMPS L1 L2 L3

INDOOR FAN AMPS

TEMPERATURES

OUTDOOR-AIR TEMPERATURE DB

RETURN-AIR TEMPERATURE DB WB

COOLING SUPPLY AIR

PRESSURES

REFRIGERANT SUCTION PSIG

REFRIGERANT DISCHARGE PSIG

MVERIFY THAT 3-PHASE SCROLL COMPRESSOR (50SS048,060; 50SX036-060 UNITS ONLY) IS ROTATING

IN CORRECT DIRECTION

MVERIFY REFRIGERANT CHARGE USING CHARGING CHARTS ON PAGES 28-33.

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

CUT ALONG DOTTED LINE

Copyright 1995 Carrier Corporation

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

Book 1 4

Tab 1b 6b

PC 111 Catalog No. 535-022 Printed in U.S.A. Form 50SS,SX-4SI Pg CL-1 5-95 Replaces: 50SS,SX-3SI