Carrier 48SS018-060, 48SX024-060 User Manual

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Page 1

Installation, Start-Up and

Service Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS .................1-9

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

RECEIVING AND INSTALLATION ...........10-22

Step 1 — Check Equipment ..................10

• IDENTIFY UNIT

• INSPECT SHIPMENT

Step 2 — Provide Unit Support ..............10

• ROOF CURB

• SLAB MOUNT

• FLUSH MOUNT

Step 3 — Field Fabricate Ductwork ...........10

Step 4 — Provide Clearances ................10

Step 5 — Rig and Place Unit .................10

• UNITS WITHOUT BASE RAIL

• UNITS WITH OPTIONAL BASE RAIL

Step 6 — Connect Condensate Drain .........13

Step 7 — Install Flue Hood ..................13

Step 8 — Install Gas Piping ..................13

Step 9 — Install Duct Connections ...........16

• CONFIGURING UNITS FOR DOWNFLOW (VERTICAL) DISCHARGE

Step 10 — Install Electrical Connections .....18

• HIGH-VOLTAGE CONNECTIONS

• SPECIAL PROCEDURES FOR 208-V OPERATION

• CONTROL VOLTAGE CONNECTIONS; NON-INTEGRATED CONTROL MOTOR (NON-ICM) UNITS

• CONTROL VOLTAGE CONNECTIONS; INTEGRATED CONTROL MOTOR (ICM) UNITS

• HEAT ANTICIPATOR SETTING

• TRANSFORMER PROTECTION

PRE-START-UP ............................22,23

START-UP ................................23-44

MAINTENANCE ............................44-47

TROUBLESHOOTING ......................48-50

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

48SS018-060 48SX024-060

Single Package Gas Heating/

Electric Cooling Units

Fig. 1 — Unit 48SX Shown With Optional Base Rail

Untrained personnel can perform basic maintenancefunctions 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 allsafety codes. Wear safety glassesand work gloves. Use quenching cloth for unbrazing operations. Have ﬁre extinguisher available for all brazing operations.

Improper installation,adjustment, alteration, service,maintenance, or use can cause carbon monoxide poisoning, ﬁre, or an explosion which can result in personal injury or unitdamage. Consulta qualiﬁed installer,service agency, or gas supplier for information or assistance. The qualiﬁed installer or agency mustuse only factory-authorized kits or accessories when modifying this product.

NOTE TO INSTALLER — Before the installation, READ THESE INSTRUCTIONS CAREFULLY AND COMPLETELY.Also, make sure the User’s Manual and Replacement Guide are left with the unit after installation. The furnace is NOT to be used for temporary heating of buildings or structures under construction.

SAFETY CONSIDERATIONS

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

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

Book 1 4 Tab 1a 6a

PC 111 Catalog No. 534-721 Printed in U.S.A. Form 48SS,SX-12SI Pg 1 9-98 Replaces: 48SS,SX-11SI

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

General — The 48SS,SX units (see Fig. 1) are fully self-

contained, combination Category I gas heating/electric cooling units designed for outdoor installation. See Fig. 2-9 (pages 2-9) for unit dimensions. All unit sizes have discharge openings for both horizontal and downﬂow conﬁgurations, andare factory shippedwith all 4duct openings covered. Units may be installed either on a rooftop or a ground-level cement slab. See Fig. 10 for roof curb dimensions.

Page 2

REQ’D CLEARANCES FOR SERVICING. in. (mm)

Duct panel .............................0

Unit top ...........................36(914)

Side opposite ducts .....................36(914)

Compressor access .....................36(914)

(Except for NEC requirements) REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)

Maximum extension of overhangs ...............48(1219)

Unit top ...........................14(356)

Duct side of unit ........................2(51)

Side opposite ducts .....................14(356)

Bottom of unit ...........................0

Flue panel .........................36(914)

NEC REQ’D 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)

UNIT

48SS180040 208/230-1-60 272 123 81/37 62/28 76/35 53/24 24.1/613 48SS024040 208/230-1-60 303 138 97/44 43/20 123/56 40/18 24.1/613 48SS024060 208/230-1-60 315 143 100/45 46/21 126/57 43/20 24.1/613 48SS030040 208/230-1-60, 208/230-3-60 320 145 100/45 47/21 126/57 47/21 24.1/613 48SS030060/080 208/230-1-60, 208/230-3-60 332 149 103/46 50/22 129/58 50/23 24.1/613 48SS036060/080 208/230-1-60, 208/230-3-60, 460-3-60 336 153 86/39 76/35 111/50 63/29 24.1/613 48SS036100/120 208/230-1-60, 208/230-3-60, 460-3-60 348 158 89/40 79/36 114/52 66/30 24.1/613 48SS042060/080 208/230-1-60, 208/230-3-60, 460-3-60 375 170 95/43 86/39 119/54 75/34 28.1/714 48SS042100/120 208/230-1-60, 208/230-3-60, 460-3-60 387 176 98/45 89/40 122/55 78/35 28.1/714

UNIT

48SS018040 48SS024040 27.07/688 23.35/593 48SS024060 26.98/685 23.27/591 48SS030040 26.71/678 23.46/596 48SS030060/080 27.15/689 22.36/568 48SS036060/080 27.50/698 22.48/571 48SS036100/120 27.40/696 22.44/570 48SS042060/080 48SS042100/120 26.94/684 22.44/570

in./mm

⁄16/420.7 1815⁄16/481.0

⁄16/522.3 2215⁄16/582.6

ELECTRICAL

CHARACTERISTICS

in./mm

CENTER OF GRAVITY in./mm

25.07/637 20.59/523

27.01/686 22.44/570

XYZ

UNIT WEIGHT lbkgABCD E

CG — Center of Gravity COND — Condenser LV — Low Voltage

NOTES:

10.85/276

12.7/321

1. Clearances mustbemaintained to preventrecirculationof air from outdoorfan discharge.

2. Adequateclearance around airopenings into combustionchamber must be provided.

CORNER WEIGHT

(lb/kg)

LEGEND

MAT’L — Material NEC — National Electrical Code REQ’D — Required

UNIT HEIGHT

(in./mm)

Fig. 2 — 48SS018-042 Without Base Rail, Unit Dimensions

Page 3

REQ’D CLEARANCES FOR SERVICING. in. (mm)

Duct panel .............................0

Unit top ...........................36(914)

Side opposite ducts .....................36(914)

Compressor access .....................36(914)

(Except for NEC requirements) REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)

Maximum extension of overhangs ...............48(1219)

Unit top ...........................14(356)

Duct side of unit ........................2(51)

Side opposite ducts .....................14(356)

Bottom of unit ...........................0

Flue panel .........................36(914)

NEC REQ’D 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)

UNIT

48SS018040 208/230-1-60 296 135 87/40 68/31 82/37 59/27 27.4/697 48SS024040 208/230-1-60 327 149 103/47 49/22 129/59 46/21 27.4/697 48SS024060 208/230-1-60 339 155 106/48 52/24 132/60 49/22 27.4/697 48SS030040 208/230-1-60, 208/230-3-60 344 157 106/48 53/24 132/60 53/24 27.4/697 48SS030060/080 208/230-1-60, 208/230-3-60 356 162 102/46 71/32 123/56 60/27 27.4/697 48SS036060/080 208/230-1-60, 208/230-3-60, 460-3-60 360 164 92/42 82/37 117/53 69/31 27.4/697 48SS036100/120 208/230-1-60, 208/230-3-60, 460-3-60 372 169 95/43 85/39 120/55 72/33 27.4/697 48SS042060/080 208/230-1-60, 208/230-3-60, 460-3-60 399 181 101/46 92/42 125/57 81/37 31.4/798 48SS042100/120 208/230-1-60, 208/230-3-60, 460-3-60 411 187 104/47 95/43 128/58 84/38 31.4/798

UNIT

48SS018040 48SS024040 26.90/683.3 20.17/512.3 48SS024060 26.82/681.2 20.22/513.6 48SS030040 26.57/674.9 20.1 /509.3 48SS030060/080 26.93/684 21.1 /535.4 48SS036060/080 27.31/693.7 21.0 /532.6 48SS036100/120 27.23/691.6 21.0 /533.1 48SS042060/080 48SS042100/120 26.81/681 21.0 /533.7

in./mmGin./mm

⁄8/504.8 221⁄4/565.4

⁄8/606.4 261⁄4/666.8

ELECTRICAL

CHARACTERISTICS

CENTER OF GRAVITY in./mm

XYZ

25.04/636 22.72/577

26.87/682.5 21.0 /533.1

UNIT WEIGHT lbkgABCD E

CG — Center of Gravity COND — Condenser LV — Low Voltage

NOTES:

13.16/334.3

14.96/380

1. Clearances mustbemaintained to preventrecirculationof air from outdoorfan discharge.

2. Adequateclearance around airopenings into combustionchamber must be provided.

CORNER WEIGHT

(lb/kg)

LEGEND

MAT’L — Material NEC — National Electrical Code REQ’D — Required

UNIT HEIGHT

(in./mm)

Fig. 3 — 48SS018-042 With Optional Base Rail, Unit Dimensions

Page 4

REQ’D CLEARANCES FOR SERVICING. in. (mm)

Duct panel .............................0

Unit top ...........................36(914)

Side opposite ducts .....................36(914)

Compressor access .....................36(914)

(Except for NEC requirements) REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)

Maximum extension of overhangs ...............48(1219)

Unit top ...........................14(356)

Duct side of unit ........................2(51)

Side opposite ducts .....................14(356)

Bottom of unit ...........................0

Flue panel .........................36(914)

NEC REQ’D 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)

UNIT

48SS048080 208/230-1-60, 208/230-3-60, 460-3-60 414 188 107/49 83/38 158/72 66/30 48SS048100/120/140 208/230-1-60, 208/230-3-60, 460-3-60 426 193 110/50 86/39 159/72 71/32 48SS060080 208/230-1-60, 208/230-3-60, 460-3-60 453 206 117/53 93/42 167/76 76/35 48SS060100/120/140 208/230-1-60, 208/230-3-60, 460-3-60 465 211 120/55 96/44 167/76 82/37

UNIT

48SS048080 28.76/731 23.46/596 15.35/390 48SS048100/120/140 28.42/722 23.42/595 15.35/390 48SS060080 28.36/720 23.27/591 15.35/390 48SS060100/120/140 27.95/710 23.23/590 15.35/390

ELECTRICAL

CHARACTERISTICS

CENTER OF GRAVITY (in./mm)

XYZ

UNIT WEIGHT

lb kg A B C D

CG — Center of Gravity COND — Condenser LV — Low Voltage

NOTES:

1. Clearances mustbemaintained to preventrecirculationof air from outdoorfan discharge.

2. Adequateclearance around airopenings into combustionchamber must be provided.

CORNER WEIGHT

(lb/kg)

LEGEND

MAT’L — Material NEC — National Electrical Code REQ’D — Required

Fig. 4 — 48SS048,060 Without Base Rail, Unit Dimensions

Page 5

REQ’D CLEARANCES FOR SERVICING. in. (mm)

Duct panel .............................0

Unit top ...........................36(914)

Side opposite ducts .....................36(914)

Compressor access .....................36(914)

(Except for NEC requirements) REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)

Maximum extension of overhangs ...............48(1219)

Unit top ...........................14(356)

Duct side of unit ........................2(51)

Side opposite ducts .....................14(356)

Bottom of unit ...........................0

Flue panel .........................36(914)

NEC REQ’D 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)

UNIT

48SS048080 208/230-1-60, 208/230-3-60, 460-3-60 438 199 113/51 89/40 164/75 72/33 48SS048100/120/140 208/230-1-60, 208/230-3-60, 460-3-60 450 205 116/53 92/42 165/75 77/35 48SS060080 208/230-1-60, 208/230-3-60, 460-3-60 477 217 123/56 99/45 173/79 82/37 48SS060100/120/140 208/230-1-60, 208/230-3-60, 460-3-60 489 222 126/57 102/46 173/79 88/40

UNIT

48SS048080 28.54/724.9 20.00/508 17.66/448.6 48SS048100/120/140 28.22/716.8 20.05/509.3 17.66/448.6 48SS060080 28.18/715.6 20.19/512.8 17.66/448.6 48SS060100/120/140 27.79/705.9 20.23/513.8 17.66/448.6

CENTER OF GRAVITY (in./mm)

XYZ

ELECTRICAL

CHARACTERISTICS

UNIT WEIGHT

lb kg A B C D

CG — Center of Gravity COND — Condenser LV — Low Voltage

NOTES:

1. Clearances mustbemaintained to preventrecirculationof air from outdoorfan discharge.

2. Adequateclearance around airopenings into combustionchamber must be provided.

CORNER WEIGHT

(lb/kg)

LEGEND

MAT’L — Material NEC — National Electrical Code REQ’D — Required

Fig. 5 — 48SS048,060 With Optional Base Rail, Unit Dimensions

Page 6

REQ’D CLEARANCES FOR SERVICING. in. (mm)

Duct panel .............................0

Unit top ...........................36(914)

Side opposite ducts .....................36(914)

Compressor access .....................36(914)

(Except for NEC requirements) REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)

Maximum extension of overhangs ...............48(1219)

Unit top ...........................14(356)

Duct side of unit ........................2(51)

Side opposite ducts .....................14(356)

Bottom of unit ...........................0

Flue panel .........................36(914)

NEC REQ’D 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)

UNIT

48SX024040 208/230-1-60 333 151 104/47 50/23 130/59 49/22 48SX024060 208/230-1-60 345 157 107/49 53/24 133/60 52/24 48SX030040 208/230-1-60 336 153 97/44 66/30 118/54 55/25 48SX030060/080 208/230-1-60 348 158 100/45 69/31 121/55 58/26 48SX036060/080 208/230-1-60, 208/230-3-60, 460-3-60 366 166 94/43 84/38 117/53 71/32 48SX036100/120 208/230-1-60, 208/230-3-60, 460-3-60 378 172 97/44 87/40 120/55 74/34

UNIT

48SX024040 26.71/678 20.06/510 12.65/321 48SX024060 26.64/677 20.12/511 12.65/321 48SX030040 27.06/687 21.05/535 12.65/321 48SX030060/080 26.98/685 21.07/535 12.65/321 48SX036060/080 27.14/689 21.10/536 12.65/321 48SX036100/120 27.06/687 21.12/536 12.65/321

ELECTRICAL

CHARACTERISTICS

CENTER OF GRAVITY (in./mm)

XYZ

UNIT WEIGHT

lbkgABCD

CORNER WEIGHT

(lb/kg)

LEGEND

CG — Center of Gravity COND — Condenser LV — Low Voltage

NOTES:

1. Clearances mustbemaintained to preventrecirculationof air from outdoorfan discharge.

2. Adequateclearance around airopenings into combustionchamber must be provided.

Fig. 6 — 48SX024-036 Without Base Rail, Unit Dimensions

MAT’L — Material NEC — National Electrical Code REQ’D — Required

Page 7

REQ’D CLEARANCES FOR SERVICING. in. (mm)

Duct panel ...........................0

Unit top .........................36(914)

Side opposite ducts ....................36(914)

Compressor access ....................36(914)

(Except for NEC requirements) REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)

Maximum extension of overhangs .............48(1219)

Unit top .........................14(356)

Duct side of unit ......................2(51)

Side opposite ducts ....................14(356)

Bottom of unit .........................0

Flue panel ........................36(914)

NEC REQ’D 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)

UNIT

48SX024040 208/230-1-60 357 163 110/50 56/25 136/62 55/25 48SX024060 208/230-1-60 369 168 113/51 59/27 139/63 58/26 48SX030040 208/230-1-60 360 164 103/47 72/33 124/56 61/28 48SX030060/080 208/230-1-60 372 169 106/48 75/34 127/58 64/29 48SX036060/080 208/230-1-60, 208/230-3-60, 460-3-60 390 177 100/45 90/41 123/56 77/35 48SX036100/120 208/230-1-60, 208/230-3-60, 460-3-60 402 183 103/47 93/42 127/57 80/36

UNIT

48SX024040 26.57/674.9 20.17/512.3 14.96/380.0 48SX024060 26.51/673.3 20.22/513.6 14.96/380.0 48SX030040 26.90/683.3 21.09/535.7 14.96/380.0 48SX030060/080 26.83/681.5 21.11/536.2 14.96/380.0 48SX036060/080 26.99/685.5 21.14/537.0 14.96/380.0 48SX036100/120 26.92/683.8 21.14/537.0 14.96/380.0

ELECTRICAL

CHARACTERISTICS

CENTER OF GRAVITY (in./mm)

XYZ

UNIT WEIGHT

lb kg A B C D

CG — Center of Gravity COND — Condenser LV — Low Voltage

NOTES:

1. Clearances mustbemaintained to preventrecirculationof air from outdoorfan discharge.

2. Adequateclearance around airopenings into combustionchamber must be provided.

CORNER WEIGHT

(lb/kg)

LEGEND

MAT’L — Material NEC — National Electrical Code REQ’D — Required

Fig. 7 — 48SX024-036 With Optional Base Rail, Unit Dimensions

Page 8

REQ’D CLEARANCES FOR SERVICING. in. (mm)

Duct panel .............................0

Unit top ...........................36(914)

Side opposite ducts .....................36(914)

Compressor access .....................36(914)

(Except for NEC requirements) REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)

Maximum extension of overhangs ...............48(1219)

Unit top ...........................14(356)

Duct side of unit ........................2(51)

Side opposite ducts .....................14(356)

Bottom of unit ...........................0

Flue panel .........................36(914)

NEC REQ’D 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)

UNIT

48SX042060/080 208/230-1-60, 208/230-3-60, 460-3-60 391 178 100/45 91/41 120/55 80/36 48SX042100/120 208/230-1-60, 208/230-3-60, 460-3-60 403 183 103/47 94/43 123/56 83/38 48SX048080 208/230-1-60, 208/230-3-60, 460-3-60 422 192 109/50 85/39 158/72 70/32 48SX048100/120/140 208/230-1-60, 208/230-3-60, 460-3-60 434 197 112/51 88/40 161/73 73/33 48SX060080 208/230-1-60, 208/230-3-60 453 206 117/53 93/42 167/76 76/35 48SX060100/120/140 208/230-1-60, 208/230-3-60 465 211 120/55 96/44 167/76 82/37

UNIT

48SX042060/080 26.66/677 21.19/538 15.35/390 48SX042100/120 26.61/676 21.21/539 15.35/390 48SX048080 28.45/723 19.95/507 15.35/390 48SX048100/120/140 28.35/720 19.99/508 15.35/390 48SX060080 28.36/720 23.27/591 15.35/390 48SX060100/120/140 27.95/710 23.23/590 15.35/390

ELECTRICAL

CHARACTERISTICS

CENTER OF GRAVITY (in./mm)

XYZ

UNIT WEIGHT

lbkgABCD

CG — Center of Gravity COND — Condenser LV — Low Voltage

NOTES:

1. Clearances mustbemaintained to preventrecirculationof air from outdoorfan discharge.

2. Adequateclearance around airopenings into combustionchamber must be provided.

CORNER WEIGHT

(lb/kg)

LEGEND

MAT’L — Material NEC — National Electrical Code REQ’D — Required

Fig. 8 — 48SX042-060 Without Base Rail, Unit Dimensions

Page 9

REQ’D CLEARANCES FOR SERVICING. in. (mm)

Duct panel .............................0

Unit top ...........................36(914)

Side opposite ducts .....................36(914)

Compressor access .....................36(914)

(Except for NEC requirements) REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)

Maximum extension of overhangs ...............48(1219)

Unit top ...........................14(356)

Duct side of unit ........................2(51)

Side opposite ducts .....................14(356)

Bottom of unit ...........................0

Flue panel .........................36(914)

CG — Center of Gravity COND — Condenser LV — Low Voltage MAT’L — Material NEC — National Electrical Code REQ’D — Required

UNIT

48SX042060,080 208/230-1-60, 208/230-3-60, 460-3-60 415 189 106/48 97/44 126/57 86/39 48SX042100,120 208/230-1-60, 208/230-3-60, 460-3-60 427 194 109/50 100/45 129/59 89/40 48SX048080 208/230-1-60, 208/230-3-60, 460-3-60 446 293 115/52 91/41 164/75 76/35 48SX048100/120/140 208/230-1-60, 208/230-3-60, 460-3-60 458 208 118/54 94/43 167/76 79/36 48SX060080 208/230-1-60, 208/230-3-60 477 217 123/56 99/45 173/79 82/37 48SX060100/120/140 208/230-1-60, 208/230-3-60 489 222 126/57 102/46 173/79 88/40

UNIT

48SX042060,080 26.55/674.4 21.22/539.0 17.66/448.6 48SX042100,120 26.50/673.0 21.24/539.6 17.66/448.6 48SX048080 28.25/717.6 20.04/509.0 17.66/448.6 48SX048100/120/140 28.16/715.3 20.08/510.0 17.66/448.6 48SX060080 28.18/715.6 20.19/512.8 17.66/448.6 48SX060100/120/140 27.79/705.9 20.23/513.8 17.66/448.6

ELECTRICAL

CHARACTERISTICS

CENTER OF GRAVITY (in./mm)

XYZ

LEGEND

UNIT WEIGHT

lb kg A B C D

NOTES:

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

2. Adequate clearance around air openings into combustion chamber must be provided.

NEC REQ’D 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)

CORNER WEIGHT

(lb/kg)

Fig. 9 — 48SX042-060 With Optional Base Rail, Unit Dimensions

Page 10

RECEIVING AND INSTALLATION

Step 1 — Check Equipment

IDENTIFYUNIT — The unit model numberand serial number are stamped on unit identiﬁcation plate. Check this information against shipping papers and job data.

INSPECT SHIPMENT— Inspect for shipping damage while unit is still on shipping pallet. If unit appears to be damaged or is tornloose from its anchorage, have it examined by transportation inspectors before removal. Forward claim papers directly to transportation company. Manufacturer is not responsible 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, leaveall parts in original packages until installation.

Step 2 — Provide Unit Support

ROOF CURB — Install accessory roof curb in accordance with instructions shipped with curb.See Fig. 10 for roof curb dimensions. Install insulation, 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 applied gasketing can also result in air leaks and poor unit performance.

Curb should be level to within1⁄4inch. 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 be ﬂush on the front of the unit (to allow condensate drain installation) and should extend 2 in. on the three remaining sides of the unit. See Fig. 11. Install a 6-in. gravel apron in front of condenser-air inlets to prevent obstruction of airﬂow by grass or shrubs. Do not secure the unit to the slab except when required by local codes.

FLUSH MOUNT — Place side of unit with duct panel ﬂush against transition. On units with optional base rails, the skirt on duct-panel side of unit can be removed to allow unit to be mounted ﬂush against transitions that extend below basepan of unit. To remove skirt, remove 4 screws holding skirt to base rail. Then, remove skirt.

To remove wood support under unit (with base rail only), loosen 4 screws above rigging holes and slide assembly out through rectangular hole.

Step 3 — Field Fabricate Ductwork — Secure all

ducts to roof curb and building structure on vertical discharge units. Do not connect ductwork to unit. For horizontal applications, unitis provided with ﬂanges on thehorizontal openings. All ductwork should be secured to the ﬂanges. Insulate and weatherproof all external ductwork, joints, and roof openings with counter ﬂashing and mastic in accordance with applicable codes.

Ducts passing through an unconditioned space must be

insulated and covered with a vapor barrier.

If a plenum return is used on a vertical unit, the return should be ducted through the roof deck to comply with applicable ﬁre codes.

A minimum clearance is not required around ductwork. Cabinet return-air static shall not exceed −.25 in. wg.

Step 4 — Provide Clearances — The required mini-

mum operating and service clearances are shown in Fig. 2-9. Adequate combustion, ventilation, and condenser air must be provided, in accordance with section 5.3, Air for Combustion and Ventilation, of the National Fuel Gas Code ANSI (American National Standards Institute) Z223.1 (in Canada, sections 7.2, 7.3 or 7.4 or Can/CGA [Canadian Gas Association] B149 Installation Codes), or applicable provisions of local building code.

Do not restrict condenser airﬂow. An air restriction at either the outdoor-air inlet or the fan discharge can be detrimental to compressor life.

The condenser fan pushes air through the condenser coil and dischargesit through the bank of louvers in thetop cover, the decorative grille on the right side of the unit, 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 overhead obstruction. Theminimum clearance under a partial overhang (such as a normal house overhang) is 48-in. above the unit top. The maximum horizontal extension of a partial overhang must not exceed 48 inches.

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 materials. The unit may be installed on wood ﬂooring or on Class A, B, or C roof covering materials.

Step 5 — Rig and Place Unit

When installing the unit on a rooftop, be sure the roof will support the additional weight. Refer to Fig. 2-9 for corner weight information.

Use spreader bars or crate top when rigging the unit. The units must be rigged for lifting as shown in Fig. 12 and 13. Refer to Tables 1 and 2 for operating weight and to Fig. 2-9 for corner weights. Use extreme caution to prevent damage

when moving the unit. Unit must remain in an upright position during all rigging and moving operations. The unit

must be level for proper condensate drainage; therefore, 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 properly supports the unit.

Page 11

PART NUMBER ‘‘A’’

FLAT

CURB

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.

CPRFCURB001A00 89 [203] CPRFCURB002A00 119 [279] CPRFCURB003A00 149 [356]

Fig. 10 — Roof Curb Dimensions

Page 12

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 supportthrough rectangular hole in rail.

All panels must be in place when rigging.

Fig. 11 — Slab Mounting Details

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 wooden top skid when rigging, to prevent rigging straps from damaging unit.

All panels must be in place when rigging.

UNIT 48SS

Size lb kg in. mm in. mm in. mm

018 332 150 024 375 170 22.4 570 24.85 631 030 384 174 22.3 565 24.85 631 036 408 185 22.0 559 24.85 631 042 447 203 22.5 571 28.85 733 048 486 220 21.0 533 34.85 885 060 525 238 21.5 545 34.85 885

UNIT 48SX

024 405 184 030 408 185 22.4 569 28.9 733 036 438 199 22.4 569 28.9 733 042 463 210 22.8 579 34.9 885 048 494 224 21.1 536 34.9 885 060 525 238 21.5 545 34.9 885

MAX

WEIGHT

ABC

24.3 618 24.85 631

49.4 1255

22.8 579 28.9 733

49.4 1255

Fig. 12 — Suggested Rigging for Units Without

Base Rail

UNIT 48SS

Size lb kg in. mm in. mm in. mm

018 320 145 024 363 165 22.6 574 28.2 715 030 380 172 22.5 571 28.2 715 036 396 180 22.2 563 28.2 715 042 435 197 22.6 574 32.2 816 048 474 215 21.2 538 38.2 969 060 513 233 21.6 549 38.2 969

UNIT 48SX

024 393 178 030 396 180 22.6 574 32.2 816 036 426 193 22.5 571 32.2 816 042 451 205 22.9 582 38.2 969 048 482 219 21.3 540 38.2 969 060 513 233 21.6 549 38.2 969

MAX

WEIGHT

ABC

24.4 619 28.2 715

49.4 1255

22.9 582 32.2 816

49.4 1255

Fig. 13 — Suggested Rigging for Units With

Optional Base Rail

UNITS WITHOUT BASE RAIL — If accessory rigging brackets are to be used for rigging, install them 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 below −10 F.

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 gravity. (See Fig. 2, 4, 6, 8, and 12.).

2. Position paint protectors and foam strips between screws

and painted surfaceof unit. Tightenscrews until they make contact with the paint protectors.

3. Securedevice or hook of sufficientstrength to holein bracket

as shown in detail ‘‘A’’ of Fig. 12.

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

vent straps from damaging unit. If wood top is not available, use spreader bars of sufficient length.

Page 13

UNITS WITH OPTIONAL BASE RAIL — Lifting holes are provided in optional base rail as shown in Fig. 13. Operating weights are shown in Tables 1 and 2. Refer to rigging instructions on unit.

Protective wood support must be removed from unit before unit is mounted to curb. Remove 4 screws that secure support above riggingholes in rails. Slide support out through rectangular hole in rail. See Fig. 13.

Step 6 — Connect Condensate Drain

NOTE: When installing condensatedrain connection be sure to comply with local codes and restrictions.

Model 48SS,SX disposes of condensate water through a

⁄4in. NPT ﬁtting which exits through the compressor access

panel. See Fig. 2-9 for location.

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 condensate 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 prevent the pan from overﬂowing. See Fig. 14. 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 at the condensate connection to ensure proper drainage. See Fig. 14. Make sure that the outlet of the trapis at least 1 in. lower than the drainpan condensate connection to prevent the pan from overﬂowing. Prime the trap with water. Connect a drain tube using a minimum of

⁄4-in. PVC or3⁄4-in. copper pipe (all ﬁeldsupplied) at the outlet end of the 2-in. trap. Do not undersize the tube. Pitch the drain tube downward at a slope of at least one in. for every 10 ft of horizontal run. Be sure to check the drain tube for leaks.

Fig. 14 — Condensate Trap

Step 7 — Install Flue Hood — The ﬂue hood as-

sembly is shipped screwed to the control box in the burner compartment. Remove the burner access panel to locate the assembly.

For units being installed in California Air Quality Management Districts which require NO 40 nanograms/joule or less, kit CRLOWNOX001A00 must be installed.

The venting system is designed to ensure proper venting. The ﬂue hood assembly must be installed as indicated in this section of the unit installation instructions.

Install the ﬂue hood as follows:

1. This installation must conform with local building codes

and withthe National FuelGas Code (NFGC),ANSI Z223.1 (in Canada,CAN/CGA B149.1, andB149.2) or NFPA(National Fire Protection Association) latest revision. Refer

emissions of

to Provincial and local plumbingor wastewater codes and other applicable local codes.

2. Remove from shipping location. Place vent cap assembly over ﬂue panel. Orient screw holes in vent cap with holes in the ﬂue panel.

3. Secure ﬂue hood to ﬂue panel by inserting a single screw on the right side, the left side, and the top of the hood.

Step 8 — Install Gas Piping — The gas supply pipe

enters the unit through the access hole provided. The gas connection to the unit is made to the1⁄2-in. FPT gas inlet on the manual shutoff or gas valve.

Install a gas supply line that runs to the heating section. Refer to Table 3 and the NFGC for gas pipe sizing. Do not use cast-iron pipe. It is recommended that a black iron pipe is used. Check the local utility for recommendations concerning existing lines. Size gas supply piping for 0.5 in. wg maximum pressure drop. Never use pipe smaller than the

⁄2-in. FPT gas inlet on the unit gas valve.

For natural gas applications, the gas pressure at unit gas connection must not be less than 4.0 in. wg or greater than 13 in. wg while the unit is operating. For propane applications, the gas pressure must not be less than 4.0 in. wg or greater than 13 in. wg at the unit connection.

⁄8-in. NPT plugged tapping accessible for test gage connection must be installed immediately upstream of the gas supply connection to the furnace.

When installing the gas supply line, observe local codes pertaining to gas pipe installations.Refer to the NFGC ANSI Z223.1-1988 NFPA latest edition (in Canada, CAN/CGA B149.1, (2)-M86). In the absence of local building codes, adhere to the following pertinent recommendations:

1. Avoid low spots in long runs of pipe. Grade all pipe

⁄4inch in every 15 ft to prevent traps. Grade all horizontal runs downward to risers. Use risers to connect to heating section and to meter.

2. Protect all segmentsof piping system against physical and thermal damage.Support all piping with appropriatestraps, hangers, etc. Use a minimum of one hanger every 6 ft. For pipe sizes larger than of national codes.

3. Apply joint compound (pipe dope) sparingly and only to male threads of joint when making pipe connections. Use only pipe dope that is resistant to action of liqueﬁed petroleum gasesas speciﬁed by local and/ornational codes.

Never use Teﬂon tape.

4. Install sediment trap in riser leading to heating section per Fig. 15. This drip leg functions as a trap for dirt and condensate.

5. Install an accessible, external, manual main shutoff valve in gas supply pipe within 6 ft of heating section.

6. Install ground-joint union close to heating section between unit manual shutoff and external manual main shutoff valve.

7. Pressure-test all gas piping in accordance with local and national plumbing and gas codes before connecting piping to unit.

NOTE: Pressure test the gas supply system after the gas supply piping is connected to the gas valve. The supply piping must be disconnected from the gas valve during the testing of the piping systems when test pressure is in excess of 0.5 psig. Pressure test the gas supply piping system at pressures equal to or less than 0.5 psig. The unit heating section must be isolated from the gas piping system by closing the external main manual shutoff valve and slightly opening the ground-joint union.

⁄2in., follow recommendations

Page 14

Table 1 — Physical Data — Unit 48SS

UNIT SIZE 48SS 018040 024040 024060 030040 030060 030080 036060 036080 036100 036120

⁄

NOMINAL CAPACITY (ton) 1 OPERATING WEIGHT (lb)

Without Base Rail 272 303 315 320 332 332 336 336 348 348 With Optional Base Rail 296 327 339 344 356 356 360 360 372 372

COMPRESSORS Rotary Reciprocating

Quantity 11

REFRIGERANT (R-22)

Charge (lb) 2.60 2.75 2.75 3.40 3.40 3.40 4.30 4.30 4.30 4.30

REFRIGERANT METERING DEVICE Acutrol™ Device

Oriﬁce ID (in.) .030 .030 .030 .030 .030 .030 .032 .032 .032 .032

CONDENSER COIL

Rows...Fins/in. 1...17 1...17 1...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17 Face Area (sq ft) 5.95 5.95 5.95 5.95 5.95 5.95 5.95 5.95 5.95 5.95

CONDENSER FAN

Nominal Cfm 1700 1700 1700 1900 1900 1900 1900 1900 1900 1900 Diameter (in.) 18 18 18 18 18 18 18 18 18 18 Motor Hp (Rpm)

EVAPORATOR COIL

Rows Fins/in. Face Area (sq ft) 1.83 2.29 2.29 2.29 2.29 2.29 3.06 3.06 3.06 3.06

EVAPORATOR FAN Direct Drive

Nominal Airﬂow (Cfm) 600 800 800 1000 1000 1000 1200 1200 1200 1200 Size (in.) 10x10 10x10 10x10 10x10 10x10 10x10 10x10 10x10 10x10 10x10 Motor Hp

FURNACE SECTION*

Burner Oriﬁce (Qty...drill size)

Natural Gas

Burner Oriﬁce (Qty...drill size)

Propane Gas

RETURN-AIR FILTERS (in.)†

Throwaway 20x20 20x20 20x20 20x24 20x24 20x24 20x24 20x24 20x24 20x24

⁄8(850)1⁄8(850)1⁄8(850)1⁄8(850)1⁄8(850)1⁄8(850)1⁄4(1050)1⁄4(1050)1⁄4(1050)1⁄4(1050)

3...15 3...15 3...15 3...15 3...15 3...15 3...15 3...15 3...15 3...15

⁄

1...32 1...32 2...40 1...32 2...40 2...32 2...40 2...32 2...30 3...32

1...41 1...41 2...47 1...41 2...47 2...42 2...47 2...42 2...40 3...42

222

⁄

3333

⁄

UNIT SIZE 48SS 042060 042080 042100 042120 048080 048100 048120 048140 060080 060100 060120 060140

⁄

31⁄

NOMINAL CAPACITY (ton) 3 OPERATING WEIGHT (lb)

Without Base Rail 375 375 387 387 414 426 426 426 453 465 465 465 With Optional Base Rail 399 399 411 411 438 450 450 450 477 489 489 489

COMPRESSORS Reciprocating Hermetic Scroll

Quantity 11

REFRIGERANT (R-22)

Charge (lb) 5.20 5.20 5.20 5.20 6.50 6.50 6.50 6.50 7.00 7.00 7.00 7.00

REFRIGERANT METERING Acutrol Device

DEVICE

Oriﬁce ID (in.) .034 .034 .034 .034 .030 .030 .030 .030 .030 .030 .030 .030

CONDENSER COIL

Rows...Fins/in. 2...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17 Face Area (sq ft) 7.04 7.04 7.04 7.04 8.67 8.67 8.67 8.67 8.67 8.67 8.67 8.67

CONDENSER FAN

Nominal Cfm 1900 1900 1900 1900 2400 2400 2400 2400 2400 2400 2400 2400 Diameter (in.) 18 18 18 18 20 20 20 20 20 20 20 20 Motor Hp (Rpm)

EVAPORATOR COIL

Rows Fins/in. 3...15 3...15 3...15 3...15 3...15 3...15 3...15 3...15 4...15 4...15 4...15 4...15 Face Area (sq ft) 3.33 3.33 3.33 3.33 4.44 4.44 4.44 4.44 4.44 4.44 4.44 4.44

EVAPORATOR FAN Direct Drive

Nominal Airﬂow (Cfm) 1400 1400 1400 1400 1600 1600 1600 1600 1995 1995 1995 1995 Size (in.) 10x10 10x10 10x10 10x10 10x10 10x10 10x10 10x10 10x11 10x11 10x11 10x11 Motor Hp

FURNACE SECTION*

Burner Oriﬁce (Qty...drill size)

Natural Gas

Burner Oriﬁce (Qty...drill size)

Propane Gas

RETURN-AIR FILTERS (in.)†

Throwaway 24x24 24x24 24x24 24x24 24x30 24x30 24x30 24x30 24x30 24x30 24x30 24x30

*Based on altitude of 0-2000 feet.

†Required ﬁlter sizes shown are based on the larger of the ARI (Air Conditioning & Refrigeration Institute) rated cool-

ing airﬂow or the heating airﬂow at a velocity of 300 ft/min for throwaway type or 450 ft/min for high-capacity type. For non-standard air ﬁlters, air ﬁlter pressure drop must not exceed 0.08 in. wg.

⁄4(1050)1⁄4(1050)1⁄4(1050)1⁄4(1050)1⁄3(1050)1⁄3(1050)1⁄3(1050)1⁄3(1050)1⁄3(1050)1⁄3(1050)1⁄3(1050)1⁄3(1050)

⁄

2...40 2...32 2...30 3...32 2...32 2...30 3...32 3...31 2...32 2...30 3...32 3...31

2...47 2...42 2...40 3...42 2...42 2...40 3...42 3...40 3...42 2...40 3...42 3...40

44445555

⁄

1111

Page 15

Table 2 — Physical Data — Unit 48SX

UNIT SIZE 48SX 024040 024060 030040 030060 030080 036060 036080 036100 036120

⁄

NOMINAL CAPACITY (ton) 222 OPERATING WEIGHT (lb)

Without Base Rail 333 345 336 348 348 366 366 378 378 With Optional Base Rail 357 369 360 372 372 390 390 402 402

COMPRESSORS Scroll

Quantity 1

REFRIGERANT (R-22)

Charge (lb) 3.9 3.9 4.5 4.5 4.5 5.4 5.4 5.4 5.4

REFRIGERANT METERING DEVICE Acutrol™ Device

Oriﬁce ID (in.) .034 .034 .030 .030 .030 .032 .032 .032 .032

CONDENSER COIL

Rows...Fins/in. 2...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17 Face Area (sq ft) 7.0 7.0 7.0 7.0 7.0 7.0 7.0 7.0 7.0

CONDENSER FAN

Nominal Cfm 2200 2200 2200 2200 2200 2200 2200 2200 2200 Diameter (in.) 20 20 20 20 20 20 20 20 20 Motor Hp (Rpm)

EVAPORATOR COIL

Rows Fins/in. Face Area (sq ft) 3.6 3.6 2.7 2.7 2.7 3.6 3.6 3.6 3.6

EVAPORATOR FAN* Direct Drive

Nominal Airﬂow (Cfm) 800 800 1000 1000 1000 1200 1200 1200 1200 Size (in.) 10x10 10x10 10x10 10x10 10x10 10x10 10x10 10x10 10x10 Motor Hp

FURNACE SECTION†

Burner Oriﬁce (Qty...drill size)

Natural Gas

Burner Oriﬁce (Qty...drill size)

Propane Gas

RETURN-AIR FILTERS (in.)**

Disposable 24x24 24x24 24x24 24x24 24x24 24x24 24x24 24x24 24x24

⁄4(1100)1⁄4(1100)1⁄4(1100)1⁄4(1100)1⁄4(1100)1⁄4(1100)1⁄4(1100)1⁄4(1100)1⁄4(1100)

2...15 2...15 3...15 3...15 3...15 4...15 4...15 4...15 4...15

⁄

1...32 2...40 1...32 2...40 2...32 2...40 2...32 2...30 3...32

1...41 2...47 1...41 2...47 2...42 2...47 2...42 2...40 3...42

⁄

3333

⁄

UNIT SIZE 48SX 042060 042080 042100 042120 048080 048100 048120 048140 060080 060100 060120 060140

⁄

31⁄

NOMINAL CAPACITY (ton) 3 OPERATING WEIGHT (lb)

Without Base Rail 391 391 403 403 422 434 434 434 453 465 465 465 With Optional Base Rail 415 415 427 427 446 458 458 458 477 489 489 489

COMPRESSORS Scroll

Quantity 1

REFRIGERANT (R-22)

Charge (lb) 5.7 5.7 5.7 5.7 5.8 5.8 5.8 5.8 7.00 7.00 7.00 7.00

REFRIGERANT METERING Acutrol Device

DEVICE

Oriﬁce ID (in.) .034 .034 .034 .034 .034 .034 .034 .034 .030 .030 .030 .030

CONDENSER COIL

Rows...Fins/in. 2...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17 2...17 Face Area (sq ft) 8.7 8.7 8.7 8.7 8.7 8.7 8.7 8.7 8.67 8.67 8.67 8.67

CONDENSER FAN

Nominal Cfm 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 Diameter (in.) 20 20 20 20 20 20 20 20 20 20 20 20 Motor Hp (Rpm)

EVAPORATOR COIL

Rows Fins/in. 3...15 3...15 3...15 3...15 4...15 4...15 4...15 4...15 4...15 4...15 4...15 4...15 Face Area (sq ft) 4.4 4.4 4.4 4.4 4.4 4.4 4.4 4.4 4.44 4.44 4.44 4.44

EVAPORATOR FAN* Direct Drive

Nominal Airﬂow (Cfm) 1400 1400 1400 1400 1600 1600 1600 1600 1995 1995 1995 1995 Size (in.) 10x10 10x10 10x10 10x10 10x10 10x10 10x10 10x10 10x11 10x11 10x11 10x11 Motor Hp

FURNACE SECTION†

Burner Oriﬁce (Qty...drill size)

Natural Gas

Burner Oriﬁce (Qty...drill size)

Propane Gas

RETURN-AIR FILTERS (in.)**

Disposable 24x30 24x30 24x30 24x30 24x30 24x30 24x30 24x30 24x30 24x30 24x30 24x30

*Size 048 evaporator fan is equipped with a 460-v or integrated control motor (ICM). Size 060 evaporator fan is

equipped with an ICM only. The ICM provides variable speed. †Based on an altitude of 0-2000 feet. **Required ﬁlter sizes shown are based on the ARI (Air Conditioning & Refrigeration Institute) rated heating airﬂow

at a velocity of 300 ft/min for throwaway type or 450 ft/min for high-capacity type. For non-standard air ﬁlters, air ﬁlter pressure drop must not exceed 0.08 in. wg.

⁄4(1100)1⁄4(1100)1⁄4(1100)1⁄4(1100)1⁄4(1100)1⁄4(1100)1⁄4(1100)1⁄4(1100)1⁄3(1050)1⁄3(1050)1⁄3(1050)1⁄3(1050)

⁄

2...40 2...32 2...30 3...32 2...32 2...30 3...32 3...31 2...32 2...30 3...32 3...31

2...47 2...42 2...40 3...42 2...42 2...40 3...42 3...40 3...42 2...40 3...42 3...40

⁄

44445555

⁄

1111

Page 16

(Text continued from page 13)

Unstable operation may occur when the gas valve and manifoldassembly are forced out of position while connecting improperly-routed rigid gas piping to the gas valve. Use a backup wrench when making connection to avoid strain on, or distortion of, the gas control piping.

If a ﬂexible conductor is required or allowed by the authority having jurisdiction, black iron pipe shall be installed at the gas valve and shall extend a minimum of 2 in. outside the unit casing.

Never use a match or other open ﬂame when checking for gas leaks. Never purge gas line into combustion chamber. Failureto follow this warning could result inan explosion causing personalinjury or death.

8. Check for gas leaks at the ﬁeld-installed and factoryinstalled gas lines after all piping connections have been completed. Use soap-and-watersolution (or method speciﬁed by local codes and/or regulations).

CONFIGURING UNITS FOR DOWNFLOW(VERTICAL) DISCHARGE

Before performing service or maintenance operations on the system, turnoff main power to unit or electrical shock could result.

1. Open all electrical disconnects before starting any service work.

2. Remove return duct cover located on duct panel. Figure 16 shows duct cover removed. Save duct cover and screws.

3. Locate lances in basepan insulation that are placed over the perimeter of the vertical duct opening cover (Fig. 17).

4. Using a straight edge and sharp knife, cut and remove the insulation around the perimeter of the cover. Remove and save 5 screws securing the cover to the basepan and slide out the cover. Discard the cover (Fig. 18).

5. Remove supply duct cover located on duct panel. Figure 16 shows duct cover removed. Save duct cover and screws.

6. Remove and discard 2 screws which secure vertical discharge opening cover to basepan (Fig. 19). Slide cover forward to disengage, thentilt and remove cover through vertical dischargeopening in bottom of unit. Discardduct cover (Fig. 20).

Fig. 15 — Sediment Trap

Step 9 — Install Duct Connections — The unit

has duct ﬂanges on the supply- and return-air openings on the side and bottom of the unit. See Fig. 2-9 for connection sizes and locations.

Collect ALLscrews that were removed.Do not leave screws on rooftop as permanentdamage to the roof may occur.

7. If unit ductwork is to be attached to vertical opening ﬂanges on the unit basepan (jackstand applications only), do so at this time.

8. It is recommended that the basepan insulation around the perimeter of the vertical return-air opening be secured to the basepan with aluminum tape. Applicable local codes may require aluminum tape to prevent exposed ﬁberglass.

9. Cover both horizontal duct openings with the duct covers from Steps 2 and 5. Make sure opening is air- and watertight.

10. Aftercompleting unit conversion, perform all safety checks and power up unit.

NOTE: The design and installation of the duct system must be in accordance with the standards of the NFPA for installation of nonresidence-type air conditioning and ventilating systems, NFPA 90A or residence-type, NFPA 90B; and/or local codes andresidence-type, NFPA90B;and/or local codes and ordinances.

Page 17

Table 3 — Maximum Gas Flow Capacity*

NOMINAL

IRON PIPE,

SIZE

(in.)

⁄

INTERNAL DIAMETER

(in.)

10 20 30 40 50 60 70 80 90 100 125 150 175 200

.622 175 120 97 82 73 66 61 57 53 50 44 40 — — .824 360 250 200 170 151 138 125 118 110 103 93 84 77 72

LENGTH OF PIPE, FT†

1 1.049 680 465 375 320 285 260 240 220 205 195 175 160 145 135

⁄

*Capacity of pipe in cu ft of gas per hr for gas pressure of 0.5 psig or less. Pressure drop of 0.5-in. wg (based on

a 0.60 speciﬁc gravity gas). Refer to Table C-4, National Fire Protection Association NFPA 54.

†This length includes an ordinary number of ﬁttings.

1.380 1400 950 770 600 580 530 490 460 430 400 360 325 300 280

1.610 2100 1460 1180 990 900 810 750 690 650 620 550 500 460 430

SUPPLY DUCT OPENING RETURN DUCT OPENING

Fig. 16 — Supply and Return Duct Openings

Fig. 18 — Vertical Duct Cover Removed

Fig. 17 — Lance Location for Vertical Duct

Opening Cover

Fig. 19 — Removal of Vertical Discharge

Opening Cover

Page 18

Step 10 — 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 ground lug in the control compartment, or conduit approved for electrical ground when installed in accordance with NEC (National Electrical Code) ANSI/ NFPA (latest edition) (in Canada, Canadian Electrical Code CSA [CanadianStandards Association] C22.1) and local electrical codes. Do not use gas piping as an elec- trical ground. Failure to adhere to this warning could result in personal injury or death.

Failure to follow these precautions could result in damage to the unit being installed:

Fig. 20 — Vertical Discharge Cover Removed

Adhere to the following criteria when selecting, sizing,

and installing the duct system:

1. Units are shipped with all 4 duct openings covered. Remove appropriate panels for intended installation.

2. Select and size ductwork, supply-air registers, and return-air grilles according to American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) recommendations.

3. Use ﬂexible transition between rigid ductwork and unit to prevent transmission of vibration. The transition may be screwed or bolted to duct ﬂanges. Use suitable gaskets to ensure weathertight and airtight seal.

4. All units must have ﬁeld-supplied ﬁlters or accessory ﬁlter rack installed in the return-air side of the unit. Recommended sizes for ﬁlters are shown in Tables 1 and 2.

5. Size all ductwork for maximum required airﬂow (either heating or cooling) for unit being installed. Avoid abrupt duct size increases or decreases or performance may be affected.

6. Adequately insulate and weatherproof all ductwork located outdoors. Insulate ducts passing through unconditioned space, and use vapor barrier in accordance with latest issue of Sheet Metal and Air Conditioning Contractors NationalAssociation (SMACNA)and AirConditioning Contractors of America (ACCA) minimum installation standards for heating and air-conditioning systems. Secure all ducts to building structure.

7. Flash, weatherproof, and vibration-isolate all openings in building structure inaccordance with local codes and good building practices.

1. Make all electrical connections in accordance with NEC ANSI/NFPA (latest edition) andlocal electrical 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 copperconductor for connections between ﬁeldsupplied electrical disconnect switch and unit. DO NOT USE ALUMINUM WIRE.

3. Be sure that high-voltage power to unit is within operating voltage range indicated on unit rating plate.

4. Do not damage internal components when drilling through any panel to mount electrical hardware, conduit, etc. On 3-phase units, ensurephases are balanced within 2%. Consult local power company forcorrection of improper voltage and/or phase imbalance.

HIGH-VOLTAGE CONNECTIONS — The unit must have a separate electrical service with a ﬁeld-supplied, waterproof, 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 switch boxmay be mounted on the unit over the high-voltage inlet hole when the standard power and low-voltage entry points are used. See Fig. 2-9 for acceptable location.

Standard Power Entry — Proceed as follows to complete the high-voltage connections to the unit:

1. Connect ground lead to chassis ground connection when

using separate ground wire.

2. Run high-voltage leads into unit control box.

3. Locate black and yellow wires connected to line side of

contactor.

4. Cut wires at partition where they exit control box.

5. Strip back leads and connect to high voltage leads. On

3-phase units, blue wire is provided stripped back and ready to connect to high voltage lead. See unit wiring label and Fig. 21.

Page 19

Table 4A — Electrical Data — Unit 48SS

UNIT SIZE 48SS

018 208/230-1-60 187 253 8.3 45.0 0.7 1.8 12.9 15 14 75 024 208/230-1-60 187 253 12.4 61.0 0.7 2.0 18.2 30 12 80

030

036

042

048

060

AWG — American Wire Gage FLA — Full Load Amps HACR — Heating, Air Conditioning and

LRA — Locked Rotor Amps MCA — Minimum Circuit Amps MOCP — Maximum Overcurrent Protection RLA — Rated Load Amps

*Fuse or HACR Breaker. † Carrier Scroll Compressor. **Copeland Scroll Compressor.

NOTES:

1. In compliance with NEC (National Electrical Code) requirements

for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR breaker.The CGA (Canadian Gas Association) 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, determine size from NEC.

3. Unbalanced 3-Phase Supply Voltage

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

the percentage of voltage imbalance. % Voltage imbalance

V-PH-Hz

208/230-1-60 187 253 14.4 82.0 1.4 2.3 21.4 30 10 100 208/230-3-60 187 253 9.4 66.0 1.4 2.0 15.1 25 12 80 208/230-1-60 187 253 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 14 100 208/230-1-60 187 253 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

208/230-1-60† 187 253 21.8 124.0 2.1 5.0 40.1 60 8 100 208/230-1-60** 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 25.9 40 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 6.4 46.5 1.1 2.3 13.7 20 14 100

460-3-60** 414 506 8.2 50.0 1.1 2.3 13.7 20 14 100 208/230-1-60 187 253 32.1 169.0 2.1 6.8 49.0 60 6 100 208/230-3-60 187 253 19.3 123.0 2.1 6.8 33.0 50 8 90

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

Refrigeration

= 100 x

max voltage deviation from average voltage

VOLTAGE

RANGE

Min Max RLA LRA FLA FLA MCA MOCP*

LEGEND

Use the following formula to determine

average voltage

COMPRESSOR

OUTDOOR-FAN

MOTOR

INDOOR-FAN

MOTOR

Example: Supply voltage is 460-3-60.

Determine maximum deviation from average voltage. (AB) 457 − 452=5v (BC) 464 − 457=7v (AC) 457 − 455=2v

Maximum deviation is 7 v. Determine percent of voltage imbalance.

% Voltage Imbalance = 100 x

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

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

POWER SUPPLY

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

Average Voltage =

= 1.53%

457

AWG60C MIN WIRE

SIZE

452 1 464 1 455

1371

= 457

MAX WIRE

LENGTH (ft)

Page 20

Table 4B — Electrical Data — Unit 48SX

UNIT SIZE

48SX

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

042

048

060

AWG — American Wire Gage FLA — Full Load Amps HACR — Heating, Air Conditioning and

LRA — Locked Rotor Amps MCA — Minimum Circuit Amps MOCP — Maximum Overcurrent Protection RLA — Rated Load Amps

*Fuse or HACR Breaker. † Carrier Scroll Compressor. **Copeland Scroll Compressor.

NOTES:

1. In compliance with NEC (National Electrical Code) requirements

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, determine size from NEC.

3. Unbalanced 3-Phase Supply Voltage

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

the percentage of voltage imbalance.

V-PH-Hz

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 14 100 208/230-1-60 187 253 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 14 100 208/230-1-60 187 253 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 14 100 208/230-1-60 187 253 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

Refrigeration

VOLTAGE

RANGE

Min Max RLA LRA FLA FLA MCA MOCP*

LEGEND

Use the following formula to determine

COMPRESSOR

OUTDOOR-FAN

MOTOR

INDOOR-FAN

MOTOR

Example: Supply voltage is 460-3-60.

Determine maximum deviation from average voltage. (AB) 457 − 452=5v (BC) 464 − 457=7v (AC) 457 − 455=2v

Maximum deviation is 7 v. Determine percent of voltage imbalance.

% Voltage Imbalance = 100 x

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

POWER SUPPLY

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

Average Voltage =

= 1.53%

457

AWG60C MIN WIRE

SIZE

452 1 464 1 455

1371

= 457

MAX WIRE

LENGTH (ft)

% Voltage imbalance

= 100 x

max voltage deviation from average voltage

average voltage

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

Page 21

LEGEND

Field Control-Voltage Wiring Field High-Voltage Wiring

NOTE: Use blue wire for 3-phase units only.

Fig. 21 — High- and Control-Voltage Connections

Alternate Power Entry

1. Remove knockouts in ﬁxed compressor panel located on duct panel side of unit.

2. Route high-voltage leads into high-voltage terminal box.

3. Connect ground wire to green-yellow wire using ﬁeldsupplied splice.

4. Connect power wires to unit high-voltage leads.

5. On 3-phase units, locate blue wire projecting from compressor junction box. Cut wire at partition and route into high-voltage junction box through grommet in back of junction box.

6. On 3-phase units, strip back blue lead and connect to third leg of the power wires.

SPECIAL PROCEDURES FOR 208-V OPERATION

Make sure that the gas supply then 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 tape and 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 cover with electrical tape so that the metal terminal cannot be seen.

CONTROL VOLTAGE CONNECTIONS; NONINTEGRATED CONTROL MOTOR (NON-ICM) UNITS — Locate the room thermostat on an inside wall in the space to be conditioned, where it will not be subjected to either a cooling orheating source or direct exposureto sunlight. Mount the thermostat 4 to 5 ft above the ﬂoor.

NOTE: Do not use any type of power-stealing thermostat. Unit control problems may result.

Use no. 18 American Wire Gage (AWG) color-coded, insulated (35 C minimum) wires to make the control voltage connections between the thermostat and the unit. If the thermostat is located more than 100 ft from the unit (as measured along thecontrol voltage wires), use no. 16AWGcolorcoded, insulated (35 C minimum) wires.

Standard Connection — Remove knockout hole located in the ﬂue panel adjacent to the control access panel. See Fig. 2-9. Remove the rubber grommet from the installer’s packet (included with unit)and install grommet in the knockout opening. Provide a drip loop before running wire through panel.

Run the low-voltage leads from the thermostat, through the inlet hole, and into unit low-voltage splice box.

Locate ﬁve 18-gage wires leaving control box. These lowvoltage connection leads can be identiﬁed by the colors red, green, yellow, brown, and white. (See Fig. 21.) Ensure the leads are long enoughto be routed into the low-voltage splice box (located below right side of control box). Cut wires at the point where they exit control box; do NOT cut yellow wire on 48SX024,030 units. Stripped yellow wire is located in connection box. Route leads through hole in bottom of control box and make low-voltage connections as shown in Fig. 21. Secure all cut wires, so that they do not interfere with operation of unit.

Alternate Connection — Removeknockout in compressorfixed panel located below high-voltageknockout. Remove the rubber grommet from the installer’s packet (included with unit) and install grommet in the knockout opening. Route thermostat wires through grommet providing drip loop at panel. Connect low-voltage leads as shown in Fig. 21. On 48SX024 and 030 units, the yellow wire originating from discharge thermostat of compressor must be cut and routed into lowvoltage section of junction box.

CONTROL VOLTAGE CONNECTIONS; INTEGRATED CONTROL MOTOR (ICM) UNITS

Routing Control Power Wires (24 v) — Remove knockout in the compressor ﬁxed access panel located below the highvoltage knockout. Remove the rubber grommet from the installer’s packet (included with unit) and install grommet in the knockout opening. Routethermostat wires through grommet providing drip loop at panel. Connect low-voltage leads to the thermostat.

Alternate Connection (24 v) — Remove knockout in the flue panel adjacent to the control access panel. Remove the rubber grommet from the installer’s packet (included with unit) and install grommet in the knockout opening. Provide a drip loop before running wire through panel. Run the lowvoltage leads from the thermostat, through the inlet hole, and into the unit low-voltage splice box.

Connecting to Easy Select Interface Board — The Easy Select interface board is located in the control box area. The Easy Select interface board is factory wired to the motor, and factory default selections are preset.

Locate the ﬁve 18-gage thermostat lead wires of plug assembly 1 (PL1) attached to the Easy Select interface board (See Fig. 22 and wiring diagrams for units 48SX048 and 060 on pages 31 and 33.) These low voltage connection leads are identiﬁed by the colors red, green, yellow, brown, and white. Cut the wires between the 2 wire ties approximately 4 in. from the plug. Connect low-voltage leads to the thermostat. Secure all cut wires in the control and splice boxes so they do not interfere with the proper operation of the unit.

Page 22

LEGEND

IFO — Indoor (Evaporator) Fan On JW — Jumper Wire

Fig. 22 — Easy Select Interface Board

HEAT ANTICIPATOR SETTING — The room thermostat heat anticipator must be properly adjusted to ensure proper heating performance. Set the heat anticipator, using an ammeter between the W and R terminals to determine the exact required setting.

NOTE: For thermostat selection purposes, use 0.18 amp for the approximate required setting.

Failure to make a proper heat anticipator adjustment will result in improper operation, discomfort to the occupants of the conditioned space,and ineff icientenergy utilization; however, the required setting may be changed slightly to provide a greater degree of comfort for a particular installation.

TRANSFORMER PROTECTION — The unit transformer protection may be one of 2 types.

The ﬁrst transformer type may containan auto. reset overcurrent protector for control circuit protection. If this device trips, it may reset without warning, starting the heating or cooling section of this product. Use caution when servicing; if overcurrent protector continues to trip, there is a problem in the low-voltageelectrical circuit, such as an electricalshort, ground, or transformer overload. Disconnect power, correct the condition, and check for normal unit operation.

The second transformer typeis of the energy-limiting type. It is set to withstand a 30-second overload or shorted secondary condition.

PRE-START-UP

Failure to observe the following warnings could result in serious personal injury:

1. Follow recognized safety practices and wear protective 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 and reclaim all refrigerant from system before touching or disturbing anything inside terminal box if refrigerant leak is suspected around compressor terminals.

5. Never attempt to repair soldered connection while refrigerant system is under pressure.

6. Do not use torch to remove any component. System contains oil and refrigerant under pressure. To remove a component, wear protective goggles and proceed as follows:

a. Shut off gas supply and then electrical power to

unit.

b. Relieve and reclaim all refrigerant from system

using both high- and low-pressure ports.

c. Cut component connectingtubing 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.

Proceed as follows to inspect and prepare the unit for ini-

tial start-up:

1. Remove all access panels.

2. Read and follow instructions on all WARNING, CAUTION, and INFORMATION labels attached to, or shipped with, unit.

3. Make the following inspections: a. Inspect for shippingand handling damages such as bro-

ken lines, loose parts, disconnected wires, etc.

b. Inspect for oil at allrefrigerant tubing connections and

on unit base. Detecting oil generally indicates a refrigerant leak. Leak-test all refrigerant tubing connections using electronic leak detector, halide torch, or liquid-soap solution. If a refrigerant leak is detected, see Check for Refrigerant Leaks section on page 23.

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.

4. Verify the following conditions:

Do not purge gas supply into the combustion chamber. Do not use a match or other open ﬂame to check for gas leaks. Failure to follow this warning could result inan explosion causing personalinjury or death.

Page 23

a. Before lighting the unit for the ﬁrst time, perform the

following: If the gas supply pipe was not purged before connecting the unit, it will be full of air. It is recommended that the ground joint union be loosened, and the supply line be allowed to purge until the odor of gas is detected. Never purge gas lines into a combustion chamber. Immediately upon detection of gas odor, retighten the union. Allow 5 minutes to elapse, then light unit.

b. Make sure that condenser-fan blade is correctly posi-

tioned in fan oriﬁce. Leading edge of condenser-fan blade should be

⁄2in. maximum from plastic fan ori-

ﬁce (see Fig. 23). c. Make sure that air ﬁlter(s) is in place. d. Make sure that condensate drain trap is ﬁlled with wa-

ter to ensure proper drainage. e. Make sure that all tools and miscellaneous loose parts

have been removed.

Fig. 23 — Fan Blade Clearance

START-UP

Check for Refrigerant Leaks —

to locate and repair a refrigerant leak and to charge the unit:

1. Locate leak and make sure that refrigerant system pressure has been relieved and reclaimed from both high- and low-pressure ports.

2. Repair leak following accepted practices. NOTE: Install a ﬁlter drier whenever the system has been

opened for repair.

3. Add a small charge of R-22 refrigerant vapor to system and leak-test unit.

4. Evacuate and reclaim refrigerant from refrigerant system if additional leaks are not found.

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

Proceed as follows

Start Up Heating Section and Make Adjustments

Complete the required procedures given inPre-Start-Up section on page 22 before starting the unit.

Do not jumper any safety devices when operating the unit.

Make sure that burner oriﬁces are properly aligned. Unstable operation may occur when the burner oriﬁces in the manifold are misaligned.

Follow the lighting instructions on the heating section operation label (located inside the burner or blower access door) to start the heating section.

NOTE: Make sure that gas supply has been purged, and that all gas piping has been checked for leaks.

CHECK HEATING CONTROL — Start and check the unit for proper heating control operation as follows. (See furnace lighting instructions located inside burner or blower access panel.)

1. Place the room thermostat SYSTEM switch in the HEAT

position and the fan switch in the AUTO. position.

2. Set theheating temperature control of thethermostat above

room temperature.

3. The induced-draft motor will start.

4. After a call forheating, the main burner should light with-

in 5 seconds. If the burners do not light, there is a 22-second delay before another 5-second try. If the burners still do not light, this sequence is repeated. If the burners do not light within 15 minutes from the initial call for heat, there is a lockout. To reset the control, break the 24-v power to W.

5. The evaporator fan willturn on 45 seconds after the flame

has been established. The evaporator fan will turn off 45 seconds after the thermostat has been satisﬁed.

CHECK GAS INPUT— Check gas input and manifold pressure after unit start-up. (See Table 5.) If adjustment is required proceed as follows.

The rated gas inputs shown in Table 5 are for altitudes from sea level to 2000 ft above sea level. These inputs are based on natural gas with a heating value of 1050 Btu/ft a heating value of 2500 Btu/ft3at 1.5 speciﬁc gravity. For elevations above 2000 ft, reduce input 4% for each 1000 ft above sea level. When the gas supply being used has a different heating value or speciﬁc gravity, refer to national and local codes, or contact your distributor to determine the required oriﬁce size.

These units are designed to consume the rated gas inputs using the ﬁxed oriﬁces at speciﬁed manifold pressures as shown in Table 5. DO NOT REDRILL THE ORIFICES UNDER ANY CIRCUMSTANCES.

ADJUST GAS INPUT — The gas input to the unit is determined by measuring the gas ﬂow at the meter or by measuring the manifold pressure. Measuring the gas ﬂow at the meter is recommended for natural gas units. The manifold pressure must be measured to determine the input of propane gas units.

at 0.65 speciﬁc gravity, or propane gas with

Page 24

Table 5 — Rated Gas Inputs at Indicated Manifold Pressures

UNIT 48SS,SX

018040, 024040, 030040 1 4.0 13.0 4.0 13.0 3.5 3.1 32 40,000 41 40,000 024060, 030060, 036060, 042060 2 4.0 13.0 4.0 13.0 3.5 3.3 40 56,000 47 54,000 030080, 036080, 042080,

048080, 060080 036100, 042100, 048100, 060100 2 4.0 13.0 4.0 13.0 3.5 3.7 30 95,000 40 95,000 036120, 042120, 048120, 060120 3 4.0 13.0 4.0 13.0 3.5 3.5 32 120,000 42 115,000 048140, 060140 3 4.0 13.0 4.0 13.0 3.5 3.4 31 136,000 40 133,000

*When a unit is converted to propane, different size oriﬁces must be used. See separate natural-to-propane conversion kit

instructions.

†Based on altitudes from sea level to 2000 ft above sea level. For altitudes above 2000 ft: reduce input rating 4% for each

additional 1000 ft above 2000 ft. In Canada, from 2000 ft above sea level to 4500 ft above sea level, derate the unit 10%.

NOTE: Unit size 018 is 48SS only.

NUMBER

ORIFICES

2 4.0 13.0 4.0 13.0 3.5 3.4 32 80,000 42 80,000

GAS SUPPLY PRESSURE

Min Max Min Max Natural Propane

(in. wg)

Natural Propane

MANIFOLD

PRESSURE

(in. wg)

NATURAL GAS PROPANE*

Oriﬁce

Drill Size

Heating

Input

(Btuh)†

Oriﬁce

Drill Size

Heating

Input

(Btuh)†

Measure Gas Flow (Natural Gas Units) — Minor adjustment to the gas ﬂow can be made by changing the manifold pressure. The manifold pressure must be maintained between 3.4 and 3.6 in. wg. If larger adjustments are required, change main burner oriﬁces following the recommendations of national and local codes.

NOTE:All other appliances that use the same meter must be turned off when gas ﬂow is measured at the meter.

Proceed as follows:

1. Turn off gas supply to unit.

2. Remove pipe plug on manifold (see Fig. 24), then connect manometer at this point. Turn on gas to unit.

3. Record number of seconds for gas meter test dial to make one revolution.

4. Divide number of seconds in Step 3 into 3600 (number of seconds in one hour).

5. Multiply result of Step 4 by the number of cu ft shown for one revolution of test dial to obtain cu ft of gas ﬂow per hour.

6. Multiply result of Step 5 by Btu heating value of gas to obtain total measured input in Btuh. Compare this value with heating input shown in Table 5. (Consult the local gas supplier if the heating value of gas is not known.)

EXAMPLE: Assume that the size of test dial is 1 cu ft, one revolution takes 30 seconds, and the heating value of the gas is 1050 Btu/ft

. Proceed as follows:

1. 30 seconds to complete one revolution.

MANIFOLD PIPE PLUG

Fig. 24 — Burner Assembly

2. 3600 ÷ 30 = 120.

3. 120x1=120ft

4. 120 x 1050 = 126,000 Btuh input.

If thedesired gas input is120,000 Btuh, only aminor change

in the manifold pressure is required.

Observe manifold pressure and proceed as follows to ad-

just gas input:

1. Remove cover screw over regulator adjustment screw on gas valve.

of gas ﬂow/hr.

Unsafe operation of the unit may result if manifold pressure is outside this range. Personal injury or unit damage may result.

3. Replace cover screw cap on gas valve.

4. Turnoff gassupply to unit. Remove manometer from pressure tap and replace pipe plug on gas valve. Turn on gas to unit and check for leaks.

2. Turnregulator adjustment screw clockwise to increase gas input, or turn regulator adjustment screw counterclockwise to decrease input. Manifold pressure must be between 3.4 and 3.6 in. wg.

Page 25

Measure ManifoldPressure (Propane Units) — The main burner oriﬁces on a propane gas unit are sized for the unit rated input when the manifold pressure reading matches the level speciﬁed in Table 5.

Proceed as follows to adjust gas input on a propane gas

unit:

1. Turn off gas to unit.

2. Remove pipe plug on manifold (see Fig. 24), then connect manometer at this point.

3. Turn on gas to unit.

4. Remove cover screw over regulator adjustment screw on gas valve.

5. Adjust regulator adjustment screw to the correct manifold pressure, as speciﬁed in Table 5. Turn adjusting screw clockwise to increase manifold pressure, or turn adjusting screw counterclockwise to decrease manifold pressure.

6. Replace cover screw.

7. Turn off gas to unit. Remove manometer from pressure tap. Replace pipe plug on gas valve, then turn on gas to unit. Check for leaks.

CHECK BURNER FLAME — Withburner access panel removed, observe the unit heating operation. Watch the burner ﬂames to see if they are light blue and soft in appearance, and thatthe ﬂames are approximately thesame for each burner . Propane will have blue ﬂame with yellow tips. See Fig. 25. Refer to Maintenance section for information on burner removal.

Fig. 25 — Monoport Burners

AIRFLOWAND TEMPERATURE RISE —The heating section for each size unit is designed and approved for heating operation within the temperature-rise range stamped on the unit rating plate.

T able6 shows the approvedtemperature-rise range for each heating input, and the air delivery cfm at various temperature rises. Theheating operation airﬂow must produce a temperature rise that falls within the approved range.

Refer to EvaporatorAirﬂow andAirﬂow Adjustments section on page 35 to adjust heating airﬂow when required.

Table 6 — Air Delivery (Cfm) at Indicated Temperature Rise and Rated Heating Input

HEATING

INPUT (Btuh)

40,000 1389 1111 926 794 694 617 556 ———————— 56,000 2083 1667 1389 1190 1042 926 833 758 ——————— 80,000 2778 2222 1852 1587 1389 1235 1111 1010 926 855 794 ————

95,000 3472 2778 2315 1984 1736 1543 1389 1263 1157 1068 992 926 868 — — 120,000 4167 3333 2778 2381 2083 1852 1667 1515 1389 1282 1190 1111 1042 980 926 136,000 5037 4029 3358 2878 2518 2238 2014 1831 1679 1549 1439 1343 1259 1185 1119

NOTE: Dashed areas do not fall within the approved temperature rise range of the unit.

20 25 30 35 40 45 50 55 60 65 70 75 80 85 90

TEMPERATURE RISE °F

Page 26

HEATING SEQUENCE OF OPERATION — See Fig. 26-33 and unit wiring label.

On a call for heating, terminal ‘‘W’’ of the thermostat is energized, starting the induced-draft motor. When the halleffect sensor on the induced-draft motor senses that it has reached the required speed, the burner sequence begins. This function is performed by the integrated gas control (IGC). The evaporator-fanmotor is energized 45 seconds after flame is established. When the thermostat is satisﬁed and ‘‘W’’ is deenergized, the burners stop ﬁring and the evaporator-fan motor shuts off after a 45-second time-off delay.

A LED (light-emitting diode) indicator is provided on the control board to monitor operation. The control board is located by removing the burner access panel. During normal operation, the LED is continuously on. See Table 7 for error codes.

Table 7 — LED Indications

ERROR CODE LED INDICATION

Normal Operation On

Hardware Failure Off

Fan On/Off Delay Modiﬁed 1 Flash

Limit Switch Fault 2 Flashes

Flame Sense Fault 3 Flashes

Four Consecutive Limit Switch Faults 4 Flashes

Ignition Lockout Fault 5 Flashes

Induced-Draft Motor Fault 6 Flashes

Rollout Switch Fault 7 Flashes

Internal Control Fault 8 Flashes NOTES:

1. There is a 3-second pause between error code displays.

2. If more than one error code exists, all applicable error codes will

be displayed in numerical sequence.

3. This chart is on the wiring diagram located inside the burner ac-

cess panel.

LIMIT SWITCHES — Normally-closed limit switch (LS) completes the control circuit through the thermostat R circuit. Should the leaving-air temperature riseabove the maximum allowable temperature, the limit switch opens and the R control circuit ‘‘breaks.’’Any interruption in the R control circuit instantly closes the gas valve and stops gas ﬂow to the burners and pilot. The blower motor continues to run until LS resets.

When the air temperature at the limit switch drops to the low-temperature setting of the limit switch, the switch closes and completes the R control circuit. The electric-spark ignition system cycles and the unit returns to normal heating operation.

AUXILIARYLIMIT SWITCH — ROLLOUT — The function of the switch is to close the main gas valve in the event of ﬂame rollout. The switch is located above the main burners. When the temperature at the auxiliary switch reaches the maximum allowable temperature, the R control circuit trips, closing the gas valve and stopping gas ﬂow to the burners. The indoor (evaporator) fan motor (IFM) and induced draft motor continue to run until switch is reset.

Start Up Cooling Section and Make Adjustments

Complete the required procedures given in the PreStart-Up section on page 22 before starting the unit.

Do not jumper any safety devices when operating the unit.

Do not operate the compressor when the outdoor temperature is below 40 F (unless accessory low-ambient kit is installed).

Do not rapid-cycle the compressor. Allow 5 minutes between ‘‘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 thatblower motor startswhen FANswitch is placed in ON positionand shuts down when FAN switch is placed in AUTO. position.

2. Place SYSTEM switchin COOL position and FAN switch in AUTO. position. Set cooling control below room temperature. Observethat compressor,condenser fan,and evaporator blower motors start. Observe that cooling cycle shuts down when control setting is satisﬁed. The evaporator fan will continue to run for 30 seconds.

3. When using an auto.-changeover room thermostat, place both SYSTEM and FAN switches in AUTO. positions. Observe that unit operates in heating mode when temperature control is set to ‘‘call for heating’’(above room temperature) and operates in cooling mode when temperature control is set to ‘‘call for cooling’’ (below room temperature).

IMPORTANT: Three-phase, scroll compressor units (48SS048,060 and48SX036-060) are direction-oriented. These units must be checked to ensure proper compressor 3-phase power lead orientation. If not corrected within 5 minutes, theinternal protector will shut offthe compressor.The 3-phase power leads to the unit must bereversed to correct rotation.When turning backwards, scroll compressors emit elevated noise levels, and the difference between compressorsuction and discharge pressures may be dramatically lower than normal.

(Text continued on page 35.)

Page 27

AWG — American Wire Gage BR — Blower Relay C—Contactor CAP — Capacitor CH — Crankcase Heater COMP — Compressor Motor CR — Combustion Relay EQUIP — Equipment FL — Fuse Link FS — Flame Sensor FU — Fuse GND — Ground GVR — Gas Valve Relay HS — Hall Effect Sensor HV TRAN — High-Voltage Transformer I—Ignitor IDM — Induced-Draft Motor IFM — Indoor-Fan Motor IGC — Integrated Gas Control IP — Internal Protector LS — Limit Switch MGV — Main Gas Valve NEC — National Electrical Code OFM — Outdoor-Fan Motor

NOTES:

1. If any of the original wire furnished must be replaced, it must be replaced with type 90 C wire or its equivalent.

2. Use copper conductors only.

Fig. 26 — 208/230-1-60 Wiring Diagram, Units 48SS018-060

LEGEND

PWR — Power QT — Quadruple Terminal RS — Rollout Switch TRAN — Transformer

Field Splice

Terminal (Marked) Terminal (Unmarked) Splice Splice (Marked)

Factory Wiring Field Control Wiring Field Power Wiring Accessory or Optional Wiring To Indicate Common Potential

Only, Not to Represent Wiring

Page 28

NOTES:

1. If any of the original wire furnished must be replaced, it must be replaced with type 90 C wire or its equivalent.

2. Use copper conductors only.

Fig. 27 — 208/230-3-60 Wiring Diagram, Units 48SS030-060

LEGEND

PWR — Power QT — Quadruple Terminal RS — Rollout Switch TRAN — Transformer

Field Splice

Terminal (Marked) Terminal (Unmarked) Splice Splice (Marked)

Factory Wiring Field Control Wiring Field Power Wiring Accessory or Optional Wiring To Indicate Common Potential

Only, Not to Represent Wiring

Page 29

AWG — American Wire Gage BR — Blower Relay C—Contactor CAP — Capacitor CH — Crankcase Heater COMP — Compressor Motor CR — Combustion Relay EQUIP — Equipment FS — Flame Sensor FU — Fuse GND — Ground GVR — Gas Valve Relay HS — Hall Effect Sensor HV TRAN — High-Voltage Transformer I—Ignitor IDM — Induced-Draft Motor IFM — Indoor-Fan Motor IGC — Integrated Gas Control LS — Limit Switch MGV — Main Gas Valve NEC — National Electrical Code OFM — Outdoor-Fan Motor PWR — Power

NOTES:

1. If any of the original wire furnished must be replaced, it must be replaced with type 90 C wire or its equivalent.

2. Use copper conductors only.

Fig. 28 — 460-3-60 Wiring Diagram, Units 48SS036-060

LEGEND

QT — Quadruple Terminal RS — Rollout Switch TRAN — Transformer

Field Splice

Terminal (Marked) Terminal (Unmarked) Splice Splice (Marked)

Factory Wiring Field Control Wiring Field Power Wiring Accessory or Optional Wiring To Indicate Common Potential

Only, Not to Represent Wiring

Page 30

NOTES:

1. If any of the original wire furnished must be replaced, it must be replaced with type 90 C wire or its equivalent.

2. Use copper conductors only.

Fig. 29 — 208/230-1-60 Wiring Diagram, Units 48SX024-042

LEGEND

AWG — American Wire Gage BR — Blower Relay C—Contactor CAP — Capacitor COMP — Compressor Motor CR — Combustion Relay DT — Discharge Thermostat EQUIP — Equipment FL — Fuse Link FS — Flame Sensor FU — Fuse GND — Ground GVR — Gas Valve Relay HS — Hall Effect Sensor HV TRAN — High-Voltage Transformer I—Ignitor IDM — Induced-Draft Motor IFM — Indoor-Fan Motor IGC — Integrated Gas Control LS — Limit Switch MGV — Main Gas Valve NEC — National Electrical Code OFM — Outdoor-Fan Motor

PWR — Power QT — Quadruple Terminal RS — Rollout Switch ST — Start Thermistor TRAN — Transformer

Field Splice Terminal (Marked)

Terminal (Unmarked) Splice

Splice (Marked) Factory Wiring

Field Control Wiring Field Power Wiring Accessory or Optional Wiring To Indicate Common Potential

Only, Not to Represent Wiring

Page 31

NOTES:

1. If any of the original wire furnished must be replaced, it must be replaced with type 90 C wire or its equivalent.

2. Use copper conductors only.

Fig. 30 — 208/230-1-60 Wiring Diagram, Units 48SX048,060

LEGEND

AWG — American Wire Gage BR — Blower Relay C—Contactor CAP — Capacitor COMP — Compressor Motor CR — Combustion Relay EQUIP — Equipment FL — Fuse Link FS — Flame Sensor FU — Fuse GND — Ground GVR — Gas Valve Relay HS — Hall Effect Sensor HV TRAN — High-Voltage Transformer I—Ignitor ICM — Integrated Control Motor IDM — Induced-Draft Motor IGC — Integrated Gas Control LS — Limit Switch MGV — Main Gas Valve NEC — National Electrical Code OFM — Outdoor-Fan Motor

PWR — Power QT — Quadruple Terminal RS — Rollout Switch SEC — Secondary TRAN — Transformer

Field Splice Terminal (Marked)

Terminal (Unmarked) Splice

Splice (Marked) Factory Wiring

Field Control Wiring Field Power Wiring Accessory or Optional Wiring To Indicate Common Potential

Only, Not to Represent Wiring

Page 32

NOTES:

1. If any of the original wire furnished must be replaced, it must be replaced with type 90 C wire or its equivalent.

2. Use copper conductors only.

Fig. 31 — 208/230-3-60 Wiring Diagram, Units 48SX036-042

LEGEND

AWG — American Wire Gage BR — Blower Relay C—Contactor CAP — Capacitor COMP — Compressor Motor CR — Combustion Relay EQUIP — Equipment FL — Fuse Link FS — Flame Sensor FU — Fuse GND — Ground GVR — Gas Valve Relay HS — Hall Effect Sensor HV TRAN — High-Voltage Transformer I—Ignitor IDM — Induced-Draft Motor IFM — Indoor-Fan Motor IGC — Integrated Gas Control LS — Limit Switch MGV — Main Gas Valve NEC — National Electrical Code OFM — Outdoor-Fan Motor PWR — Power

QT — Quadruple Terminal RS — Rollout Switch TRAN — Transformer

Field Splice

Terminal (Marked) Terminal (Unmarked) Splice

Splice (Marked) Factory Wiring

Field Control Wiring Field Power Wiring Accessory or Optional Wiring To Indicate Common Potential

Only, Not to Represent Wiring

Page 33

NOTES:

1. If any of the original wire furnished must be replaced, it must be replaced with type 90 C wire or its equivalent.

2. Use copper conductors only.

Fig. 32 — 208/230-3-60 Wiring Diagram, Units 48SX048,060

LEGEND

QT — Quadruple Terminal RS — Rollout Switch SEC — Secondary TRAN — Transformer

Field Splice

Terminal (Marked) Terminal (Unmarked) Splice Splice (Marked)

Factory Wiring Field Control Wiring Field Power Wiring Accessory or Optional Wiring To Indicate Common Potential Only, Not to Represent Wiring

Page 34

NOTES:

1. If any of the original wire furnished must be replaced, it must be replaced with type 90 C wire or its equivalent.

2. Use copper conductors only.

Fig. 33 — 460-3-60 Wiring Diagram, Units 48SX036-048

LEGEND

AWG — American Wire Gage BR — Blower Relay C—Contactor CAP — Capacitor COMP — Compressor Motor CR — Combustion Relay EQUIP — Equipment FS — Flame Sensor FU — Fuse GND — Ground GVR — Gas Valve Relay HS — Hall Effect Sensor HV TRAN — High-Voltage Transformer I—Ignitor IDM — Induced-Draft Motor IFM — Indoor-Fan Motor IGC — Integrated Gas Control LS — Limit Switch MGV — Main Gas Valve NEC — National Electrical Code OFM — Outdoor-Fan Motor PWR — Power

QT — Quadruple Terminal RS — Rollout Switch TRAN — Transformer

Field Splice Terminal (Marked)

Terminal (Unmarked) Splice

Splice (Marked) Factory Wiring

Field Control Wiring Field Power Wiring Accessory or Optional Wiring To Indicate Common Potential

Only, Not to Represent Wiring

Page 35

CHECKINGANDADJUSTING REFRIGERANT CHARGE — The refrigerant system is fully charged with R-22 refrigerant, tested, and factory-sealed.

EVAPORATOR AIRFLOW AND AIRFLOW ADJUSTMENTS

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 inside of the compressor accessdoor.The label includesa ‘‘SuperheatCharging Table’’and a ‘‘Required Suction-Tube (F) Temperature’’ chart.

An accurate superheat, thermocouple-, or thermistor-type thermometer, a sling psychrometer, and a gage manifold are required when usingthe superheat charging method forevaluating 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 adjustment 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 service 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). c. Suction-tube temperature (F) at low-side service

ﬁtting.

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

5. Using ‘‘SuperheatCharging Table,’’ compare outdoor-air

temperature (F db) with evaporator inlet-air temperature (F wb) to determine desired system operating superheat temperature. See Tables 8A-8H and 9A-9F.

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

compare desired superheat temperaturewith suction (lowside) operating pressure (psig) to determine proper suctiontube temperature. See Table 10.

7. Compare actual suction-tube temperature with proper

suction-tube temperature. Using a toleranceof ± 3° F,add refrigerant if actual temperature is more than 3° F higher than proper suction-tube temperature, or remove refrigerant 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 section on page 23.

For cooling operation, the recommended airﬂow is 350 to 450 cfm for each 12,000 Btuh of rated cooling capacity. For heating operation, the airﬂow must produce a temperature rise that falls within the range stamped on the unit rating plate.

T able6 shows the temperature rise at variousairﬂow rates. Tables 11-14 show both heating and cooling airﬂows at various external static pressures. See Tables 15 and 16 for ICM (Integrated Control Motor) units air delivery. Refer to these tables to determine the airﬂow for the system being installed. See Table 17 for wet coil pressure drop.

NOTE: Be surethat all supply- and return-air grilles areopen, free from obstructions, and adjusted properly.

Shut off gas supply then disconnect electrical power to the unit before changing blower speed. Electrical shock can cause personal injury or death.

Airﬂow can be changed by changing the lead connections of the blower motor.

Unit 48SS two- or 3-speed motors (except size 030) are factory wired for low speed operation. Unit 48SS030 is factory wired for medium speed. Units 48SX024,036, and 048 (460 v) two- or 3-speed motors are factory wired for low speed; units 48SX030 and 042 are factory wired for medium speed.

For 208/230-v andA.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 blower relay (BR). This wire is attached toterminal BM for single-phase and 3-phase units. To change the speed, remove 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 fan motor speed lead from the blower relay (BR) and replace with the lead for the desired blower motor speed. 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 terminal BM of BR. To select high speed on 460-v GE motors, separate the black (female QC) from the blue lead (male QC) and connect the black lead to the BR. Insulate the blue lead to avoid contact with anychas-

sis parts.

Page 36

For IntegratedControl Motors (ICM) — T oconﬁgure the 48SX unit, move the 5 Easy Select board wires to the terminals

The selection options allow installerto adjust airﬂow to meet such individual needs as noise and static compensation, etc.

which control the airﬂow. Refer to the Easy Select interface board (Fig. 22) located next to the terminals and to Fig. 30 and 32.

Perform the following steps for basic system

conﬁguration. AUX HEAT RANGE (VIO) — The airﬂow for unit 48SX is

preset at the factory. The airﬂow selection must not be set at

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 table below:

a setting lower than the default. Refer to Table 15 for airﬂow and gas heat input for terminals 1-4.

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 selection. The preset factory default setting is AC for the 48SX units. Default setting should not be altered.

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

OPTION TERMINAL DESCRIPTION

Used when it is desirable

30-Sec On/60-Sec Off Delay Proﬁle

No Delay Option 2

30-Sec Off Delay 3 Enhances system efficiency. 45-Sec Off Delay 4 Enhances system efficiency.

to allow system coils time to heat up or cool down prior to airﬂow. Enhances system efficiency.

Presetfactory defaultsetting for 48SX. Used for servicing or when other components are used to perform a delay function (e.g., integrated gas control).

selection is MED. Selections HI and LO will adjust the airﬂow supplied for all operational modes (see following table).

Table 8A — Superheat Charging Table, 48SS018

TEMP (F)

AIR ENT

COND

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

Ewb — Entering Wet Bulb SPH — Superheat at Compressor (F)

LEGEND

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

EVAP AIR — CFM

600

Evap Air — Ewb (F)

*Do not attempt to charge system under these conditions — refrig-

erant slugging may occur.

Table 8B — Superheat Charging Table, 48SS024

TEMP (F)

AIR ENT

COND

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

Ewb — Entering Wet Bulb SPH — Superheat at Compressor (F)

LEGEND

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

EVAP AIR — CFM

800

Evap Air — Ewb (F)

*Do not attempt to charge system under these conditions — refrig-

erant slugging may occur.

Page 37

Table 8C — Superheat Charging Table, 48SS030

TEMP (F)

AIR ENT

COND

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

Ewb — Entering Wet Bulb SPH — Superheat at Compressor (F)

LEGEND

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

EVAP AIR — CFM

1000

Evap Air — Ewb (F)

*Do not attempt to charge system under these conditions — refrig-

erant slugging may occur.

Table 8D — Superheat Charging Table, 48SS036

TEMP (F)

AIR ENT

COND

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

Ewb — Entering Wet Bulb SPH — Superheat at Compressor (F)

LEGEND

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

EVAP AIR — CFM

1200

Evap Air — Ewb (F)

*Do not attempt to charge system under these conditions — refrig-

erant slugging may occur.

Table 8E — Superheat Charging Table, 48SS042

TEMP (F)

AIR ENT

COND

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 24.9

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

Ewb — Entering Wet Bulb SPH — Superheat at Compressor (F)

LEGEND

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

EVAP AIR — CFM

1400

Evap Air — Ewb (F)

*Do not attempt to charge system under these conditions — refrig-

erant slugging may occur.

Page 38

Table 8F — Superheat Charging Table, 48SS048 (Carrier Scroll Compressor)

TEMP (F)

AIR ENT

COND

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

Ewb — Entering Wet Bulb SPH — Superheat at Compressor (F)

LEGEND

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

EVAP AIR — CFM

1600

Evap Air — Ewb (F)

*Do not attempt to charge system under these conditions — refrig-

erant slugging may occur.

Table 8G — Superheat Charging Table, 48SS048 (Copeland Scroll Compressor)

TEMP (F)

AIR ENT

COND

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

Ewb — Entering Wet Bulb SPH — Superheat at Compressor (F)

LEGEND

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

EVAP AIR — CFM

1600

Evap Air — Ewb (F)

*Do not attempt to charge system under these conditions — refrig-

erant slugging may occur.

Table 8H — Superheat Charging Table, 48SS060

TEMP (F)

AIR ENT

COND

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)

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

EVAP AIR — CFM

1995

Evap Air — Ewb (F)

*Do not attempt to charge system under these conditions — refrig-

erant slugging may occur.

Page 39

Table 9A — Superheat Charging Table, 48SX024

TEMP (F)

AIR ENT

COND

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

Ewb — Entering Wet Bulb SPH — Superheat at Compressor (F)

LEGEND

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

EVAP AIR — CFM

800

Evap Air — Ewb (F)

*Do not attempt to charge system under these conditions — refrig-

erant slugging may occur.

Table 9B — Superheat Charging Table, 48SX030

TEMP (F)

AIR ENT

COND

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

Ewb — Entering Wet Bulb SPH — Superheat at Compressor (F)

LEGEND

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

EVAP AIR — CFM

1000

Evap Air — Ewb (F)

*Do not attempt to charge system under these conditions — refrig-

erant slugging may occur.

Table 9C — Superheat Charging Table, 48SX036

TEMP (F)

AIR ENT

COND

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

Ewb — Entering Wet Bulb SPH — Superheat at Compressor (F)

LEGEND

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

EVAP AIR — CFM

1200

Evap Air — Ewb (F)

*Do not attempt to charge system under these conditions — refrig-

erant slugging may occur.

Page 40

Table 9D — Superheat Charging Table, 48SX042

TEMP (F)

AIR ENT

COND

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

Ewb — Entering Wet Bulb SPH — Superheat at Compressor (F)

LEGEND

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

EVAP AIR — CFM

1400

Evap Air — Ewb (F)

*Do not attempt to charge system under these conditions — refrig-

erant slugging may occur.

Table 9E — Superheat Charging Table, 48SX048

TEMP (F)

AIR ENT

COND

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

Ewb — Entering Wet Bulb SPH — Superheat at Compressor (F)

LEGEND

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

EVAP AIR — CFM

1600

Evap Air — Ewb (F)

*Do not attempt to charge system under these conditions — refrig-

erant slugging may occur.

Table 9F — Superheat Charging Table, 48SX060

TEMP (F)

AIR ENT

COND

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

LEGEND

Ewb — Entering Wet Bulb SPH — Superheat at Compressor (F)

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

EVAP AIR — CFM

1995

Evap Air — Ewb (F)

*Do not attempt to charge system under these conditions — refrig-

erant slugging may occur.

Page 41

Table 10 — Required Suction-Tube Temperature (F)*

SUPERHEAT

TEMP (F)

0 35 37 39 41 43 45 47 49 51 2 37 39 41 43 45 47 49 51 53 4 39 41 43 45 47 49 51 53 55 6 41 43 45 47 49 51 53 55 57

8 43 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.

61.5 64.2 67.1 70.0 73.0 76.0 79.2 82.4 85.7

Table 11 — Dry-Coil Air Delivery* — Horizontal Discharge at 230 and 460 V — Unit 48SS

(Deduct 10% from Cfm and Watts for 208 V Operation)

SUCTION PRESSURE AT SERVICE PORT (psig)

UNIT

48SS

018

024, 030

036

042

048

060

*Air delivery values are without air ﬁlter and are for dry coil. See

Table 17 for wet coil pressure drop. Deduct ﬁeld-supplied air ﬁlter pressure drop and wet coil pressure drop to obtain external static pressure available for ducting.

†Unit air delivery is outside of operating range.

MOTOR

SPEED

Low

High

Low

Med

High

Low

Med

High

Low

High

Low

High

Low

Med

High

AIR

DELIVERY

Watts 230 225 220 210 195 170 ††††† Cfm 760745725695640540††††† Watts ††††270235200†††† Cfm ††††850700450†††† Watts 275 275 273 269 260 257 249 †††† Cfm 857835802782745717663†††† Watts 371 368 360 349 345 326 319 304 293 † † Cfm 1079 1063 1027 996 978 919 865 783 726 † † Watts 514 493 476 460 443 425 401 378 344 † † Cfm 1409 1383 1324 1282 1223 1156 1068 984 857 † † Watts 473 447 427 418 395 367 346 337 323 † † Cfm 1253 1253 1172 1130 1047 946 865 829 768 † † Watts 519 500 478 459 439 410 377 357 340 † † Cfm 1414 1366 1287 1234 1162 1074 920 829 743 † † Watts 667 634 609 593 564 541 506 469 436 422 † Cfm 1734 1639 1563 1461 1370 1292 1157 960 829 743 † Watts 678 635 604 580 550 520 493 455 430 † † Cfm 1540 1515 1475 1430 1375 1280 1225 1128 1020 † † Watts † 820 785 750 700 680 649 612 570 † † Cfm † 1825 1750 1685 1610 1525 1485 1355 1215 † † Watts † † 854 786 744 706 641 606 557 511 † Cfm † † 2026 1905 1830 1752 1603 1513 1367 1228 † Watts † † † 905 846 824 804 748 683 637 † Cfm † † † 2025 1905 1830 1752 1603 1398 1228 † Watts 1104 1093 1072 1029 986 938 891 830 769 733 697 Cfm 1876 1865 1840 1803 1765 1710 1641 1533 1425 1345 1264 Watts 1351 1295 1245 1197 1148 1096 1053 994 936 871 812 Cfm 2249 2209 2157 2097 2036 1959 1882 1781 1679 1542 1405 Watts † † 1391 1343 1296 1247 1191 1129 1067 1002 936

Cfm † † 2299 2231 2152 2060 1975 1859 1746 1591 1441

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

EXTERNAL STATIC PRESSURE (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. Evaporatorcoil 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.

Page 42

Table 12 — Dry-Coil Air Delivery* — Downﬂow Discharge at 230 and 460 V — Unit 48SS

(Deduct 10% from Cfm and Watts for 208 V Operation)

UNIT 48SS

018

024, 030

036

042

048

060

*Air delivery values are without air ﬁlter and are for dry coil. See Table 17

for wet coil pressure drop. Deduct ﬁeld-supplied air ﬁlter pressure drop and wet coilpressure dropto obtain external static pressureavailable for ducting.

†Unit air delivery is outside of operating range.

MOTOR

SPEED

Low

High

Low

Med

High

Low

Med

High

Low

High

Low

High

Low

Med

High

AIR

DELIVERY

Watts † 295 251 223 201 176 149 124 † † † Cfm † 821 817 753 665 536 343 164 † † † Watts 401 376 346 322 294 272 250 229 219 † † Cfm 1334 1253 1128 996 816 658 461 246 167 † † Watts † 285 284 282 278 274 270 261 251 244 230 Cfm † 798 761 727 682 634 581 525 450 371 304 Watts † 378 371 368 362 357 343 332 315 301 283 Cfm † 1011 982 948 906 858 771 703 597 492 387 Watts † 520 511 487 472 451 431 411 385 362 341 Cfm † 1342 1309 1237 1181 1106 1007 892 745 610 471 Watts † 460 439 423 398 379 349 322 297 270 246 Cfm † 1191 1136 1081 1005 907 795 687 579 471 349

Watt † 511 492 470 450 420 392 364 332 308 275 Cfm † 1316 1244 1178 1104 1005 891 784 657 535 389 Watts † 655 631 603 584 552 522 492 459 433 398 Cfm † 1541 1458 1367 1292 1178 1053 920 806 662 509 Watts † 637 612 587 560 526 493 455 † † † Cfm † 1500 1450 1405 1350 1290 1200 1105 † † † Watts † 790 750 700 679 639 608 574 547 † † Cfm † 1750 1675 1604 1509 1421 1323 1221 1094 † † Watts † 847 784 746 708 646 609 563 516 † † Cfm † 1995 1901 1822 1730 1580 1477 1319 1178 † † Watts † † 909 852 820 801 751 687 639 † † Cfm † † 2018 1896 1814 1729 1582 1380 1270 † † Watts † 983 950 923 885 845 804 751 697 665 633 Cfm † 1838 1808 1755 1702 1628 1553 1446 1339 1257 1175 Watts † 1115 1083 1045 1006 964 921 872 823 783 742 Cfm † 2067 2023 1957 1891 1807 1723 1612 1501 1392 1282 Watts † 1284 1201 1166 1131 1092 1053 1001 950 907 864 Cfm † 2167 2108 2038 1968 1882 1796 1676 1555 1437 1318

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

EXTERNAL STATIC PRESSURE (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.

Table 13 — Dry-Coil Air Delivery* — Horizontal Discharge at 230 and 460 V — Unit 48SX

(Deduct 10% from Cfm and Watts for 208 V Operation)

UNIT 48SX

024, 030

036

042

048**

*Air delivery values are without air ﬁlter and are for dry coil. See Table 17

for wet coil pressure drop. Deduct ﬁeld-supplied air ﬁlter pressure drop and wet coil pressure drop toobtain externalstatic pressureavailable for ducting.

†Unit air delivery is outside of operating range.

MOTOR

SPEED

Low

Med

High

Low

Med

High

Low

Med

High

Low

High

AIR

DELIVERY

Watts 280 275 265 255 250 245 240 †††† Cfm 820810755700660600560†††† Watts 365 360 350 345 340 330 320 310 300 † † Cfm 1025 1010 975 940 900 850 800 720 630 † † Watts † † 490 480 470 460 445 430 410 390 380 Cfm † † 1300 1255 1200 1150 1080 1005 915 790 620 Watts 520 495 474 458 445 425 ††††† Cfm 1375 1335 1290 1240 1200 1140 ††††† Watts 575 560 535 510 480 460 440 425 † † † Cfm 1520 1490 1450 1400 1380 1300 1200 1080 † † † Watts ††††650614575540510480† Cfm ††††1560 1500 1380 1280 1170 1060 † Watts 490 480 470 460 450 430 410 390 † † † Cfm 1400 1380 1340 1300 1250 1200 1140 1070 † † † Watts 590 580 560 545 525 505 480 450 420 † † Cfm 1600 1560 1540 1470 1430 1360 1300 1220 1120 † † Watts †††††700670640600560500 Cfm †††††1780 1670 1600 1480 1340 1100 Watts 1050 1000 970 930 870 810 750 680 600 † † Cfm 1850 1830 1800 1785 1750 1700 1640 1500 1330 † † Watts † † † 1050 1000 930 870 810 740 665 † Cfm † † † 2000 1940 1850 1750 1635 1500 1300 †

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

EXTERNAL STATIC PRESSURE (in. wg)

**For 460 v units only. 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.

Page 43

Table 14 — Dry-Coil Air Delivery* — Downﬂow Discharge at 230 and 460 V — Unit 48SX

(Deduct 10% from Cfm and Watts for 208 V Operation)

UNIT

48SX

024, 030

036

042

048**

*Air delivery values arewithout air ﬁlter and are for drycoil. SeeTable17

for wet coil pressure drop. Deduct ﬁeld-supplied air ﬁlter pressure drop and wet coil pressure drop to obtain external static pressure available for ducting.

†Unit air delivery is outside of operating range.

MOTOR

SPEED

Low

Med

High

Low

Med

High

Low

Med

High

Low

High

AIR

DELIVERY

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

EXTERNAL STATIC PRESSURE (in. wg)

**For 460 v units only. NOTE: Do not operate the unit at a cooling airﬂow that is less than

Table 15 — Dry Coil Air Delivery* — Heating — Horizontal and Downﬂow Discharge for Integrated Control Motor Units at230-V(Deduct10% from Cfm

for 208-V Operation)

HEATING

INPUT (Btuh)

80,000 1300 1400 1600 1750

100,000 — 1400 1600 1750

95,000 — — 1600 1750

136,000 — — — 1750

*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.

NOTES:

1. Dashed areas do not fall within approved range.

2. The abovevalues occur withtheAC/HPCFMADJUST selectjumper

set on MED.

3. Airﬂow can be adjusted 110% or −10% by selecting HI or LO for

all modes except FAN ONLY.

EASY SELECT BOARD TERMINALS (Cfm)

1234

Table 16 — Dry-Coil Air Delivery* — Fan Only and Cooling — Horizontal and Downﬂow Discharge for Integrated ControlMotorUnits at 230-V (Deduct 10%

from Cfm for 208-V Operation)

UNIT 48SX 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.

Page 44

Table 17 — Wet Coil Pressure Drop

UNIT SIZE

018*

024

030

036

042

048

060

*Unit 48SS only.

AIRFLOW

(cfm)

600 0.069 700 0.082 800 0.102 900 0.116 600 0.039 700 0.058 800 0.075 900 0.088

900 0.088 1000 0.095 1200 0.123 1000 0.068 1200 0.088 1400 0.108 1600 0.123 1000 0.048 1200 0.069 1400 0.088 1600 0.102 1400 0.068 1600 0.075 1800 0.088 1700 0.082 1900 0.095 2100 0.108 2300 0.123

PRESSURE DROP

(in. wg)

COOLING SEQUENCE OFOPERATION— Withthe room thermostat SYSTEM switch in the COOL position and the FAN switch in the AUTO. position, the cooling sequence of operation is as follows:

When the room temperature rises to a point that is slightly above the cooling control setting of the thermostat, the thermostat completes the circuit between thermostat terminal R to terminals Y and G. These completed circuits through the thermostat connect contactor coil (C) (through unit wire Y) and blower relay coil (BR) (through unit wire G) across the 24-v secondary of transformer (TRAN).

NOTE: The blower relay coil (BR) is used on standard nonICM units, ICM units use evaporator (indoor) fan on (IFO) connection.

The normally-opencontacts of energized contactor(C) close and complete the circuit through compressormotor (COMP) to condenser (outdoor) fan motor (OFM). Both motors start instantly.

On standard non-ICM units, theset of normally-open contacts of energized relay BR close and complete the circuit through evaporator blower(indoor) fan motor (IFM). OnICM units, the IFO completes the circuit through evaporatorblower IFM. The blower motor starts instantly.

NOTE: Once thecompressor has started and thenhas stopped, it should not be started again until 5 minutes have elapsed.

The cooling cycle remains ‘‘on’’ until the room temperature drops to point that is slightly below the cooling control setting of the room thermostat. At this point, the thermostat ‘‘breaks’’ the circuit between thermostat terminal R to terminals Y and G. These open circuits deenergize contactor coil C and relay coil BR. The condenser and compressor motors stop. After a 30-second delay, the blower motor stops. The unit is in a ‘‘standby’’ condition, waiting for the next ‘‘call for cooling’’ from the room thermostat.

MAINTENANCE

To ensure continuing high performance, and to minimize the possibility ofpremature equipment failure, periodic maintenance must be performed on this equipment. This combination heating/cooling unit should be inspected at least once each year by aqualiﬁed service person. Totroubleshoot heating or cooling of units, refer to tables at the back of the book.

NOTE TOEQUIPMENT OWNER: Consult yourlocal dealer about the availability of a maintenance contract.

The abilityto properly perform maintenanceon 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 WARNING COULD RESULT IN SERIOUS PERSONAL INJURY AND POSSIBLE DAMAGE TO THIS EQUIPMENT.

Failure to follow these warnings could result in serious personal injury:

1. Turn off gas supply, then turn off electrical power to the unit before performing 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, etc.

3. Never placeanything combustible either on, or incontact with, the unit.

4. Should overheating occur, or the gas supply fail to shut off, shut off the external main manual gas valve to the unit, then shut off the electrical supply.

Errors made when reconnecting wires may cause improper and dangerous operation. Label all wires prior to disconnection when servicing.

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 andwheel for cleanliness and check lubrication each heating and cooling season. Clean and lubricate (if required) when necessary. For ﬁrst heating season, inspectblower wheel bimonthly to determine proper cleaning frequency.

4. Check electrical connections for tightness and controls for properoperation each heating and coolingseason. Service when necessary.

5. Check and inspect heating section before each heating season. Clean and adjust when necessary.

6. Check ﬂue hood screen and remove any obstructions if necessary.

7. Check vent screen and clean if necessary.

Page 45

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 during each heating and cooling season orwhenever the ﬁlter(s) becomes clogged with dust and lint.

Unit Top Removal

NOTE: When performing maintenance or service procedures that require removal of the unit top, be sure to perform all of the routine maintenance procedures that require top removal, including: inspection of the heat exchanger area, coil inspection and cleaning, and condensate drain pan inspection and cleaning.

Only qualiﬁed service personnel should perform maintenance and service procedures that require unit top removal. Refer to the following top removal procedures:

1. Turn off gas supply, then turn off electric power to unit.

2. Remove all screws that secure unit top, including screws

around 4 sides and those on top that screw into internal divider panels. Save all screws.

3. Lift top from unit carefully. Set top on edge.

4. Carefully replace and secure unit top to unit, using screws

removed in Step 2, when maintenance and/or service procedures are completed. (Be sure to use original screws that have rubber washers to seal out water when securing top to internal divider panels.)

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 (

⁄16oz. 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

orientation.

b. Lift wheel from housing.When handling and/or clean-

ing blowerwheel, be sure not todisturb balance weights (clips) on blower wheel vanes.

c. Remove caked-on dirt from wheel and housing with a

brush. Removelint and/or dirt accumulations from wheel and housing with vacuum cleaner, using soft brush at-

tachment. Remove grease and oil with mild solvent. d. Reassemble wheel into housing. e. Reassemble motor into housing. Be sure setscrews are

tightened on motor shaft ﬂats and not on round part of

shaft. f. Reinstall blower access door.

4. Restore electrical power, then gas supply to unit. Start unit and check for proper blower rotation andmotor speeds during heating and cooling cycles.

Evaporator Blower and Motor

NOTE: Motors without oilers are prelubricated. Do not attempt to lubricate these motors.

For longer life, operating economy, and continuing efficiency, clean accumulated dirt and grease from the blower wheel and motor annually.

Lubricate the motor every 5 years if the motor is used intermittently (thermostat FAN switch in AUTO. position), or every 2 years if the motor is used continuously (thermostat FAN switch in ON position).

Turn off the gas supply, then 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. On standardnon-ICM units disconnect motor lead from

blower relay (BR). Disconnect yellow lead from terminal L2 of the contactor.

c. On all units remove blower assembly from unit. Re-

move screws securing blower togas partition and slide assembly out. Becareful not to tear insulation inblower compartment.

d. Ensure proper reassembly by marking blower wheel

and motor in relation to blower housing before disassembly.

e. Loosen setscrew(s) that secures wheel to motor shaft,

remove screws that secure motor mount brackets to

Flue Gas Passageways — To inspect the ﬂue col-

lector box and upper areas of the heat exchanger:

1. Remove the combustion blower wheel and motor assembly according todirections in Combustion-Air Blower section on page 46.

2. Remove the 3 screws holding the blower housing to the ﬂue collector box cover (see Fig. 34).

3. Remove the 12 screws holding the ﬂue collector box cover (Fig. 34) to the heat exchanger assembly. Inspect the heat exchangers.

4. Clean all surfaces as required using the wire brush.

FLUE COLLECTOR BOX

INDUCED DRAFT MOTOR MOUNTING PLATE

BLOWER HOUSING

BURNER RACK

MOUNTING SCREW

Fig. 34 — Blower Housing and Flue Collector Box

Page 46

Combustion-Air Blower — Clean periodically to as-

sure proper airﬂow and heating efficiency. Inspect blower wheel every fall and periodically during heating season. For the ﬁrst heating season, inspect blower wheel bimonthly to determine proper cleaning frequency.

T oinspect blower wheel,remove draft hood assembly .Shine a ﬂashlight into opening to inspect wheel. If cleaning is required, remove motor and wheel as follows:

1. Remove burner access panel. (See Fig. 35.)

2. Removethe 7 screws thatattach induced-draft motor mount-

ing plate to blower housing. (See Fig. 34.)

3. Slide the motor and blower wheel assembly out of the

blower housing. (See Fig. 36.) Clean the blower wheel. If additional cleaning is required, continue with Steps 4 and 5.

4. To remove blower, remove 2 setscrews. (See Fig. 36.)

BURNER ACCESS PANEL

Fig. 35 — Burner Access Panel

5. To remove motor,remove 4 screws that hold blowerhousing to mounting plate. Remove the motor cooling fan by removing one setscrew. Remove nuts that hold motor to mounting plate.

6. To reinstall, reverse the procedure outlined above.

Limit Switch — Remove blower panel. Limit switch is

located on the gas partition.

Burner Ignition — Unit is equipped with a direct spark

ignition 100% lockout system. Ignition module is located in the control box. Module contains a self-diagnostic LED. During servicing, refer to label diagram for LED interpretation.

If lockout occurs, unit may be reset by either momentarily interrupting power supply to unit, or turning selector switch to OFF position at the thermostat.

Main Burners — At the beginning of each heating sea-

son, inspect for deterioration or blockage due to corrosion or other causes. Observe the main burner ﬂames and adjust if necessary.

When servicing gastrain, do not hit or plug oriﬁcespuds.

REMOVAL OF GAS TRAIN

1. Shut off manual gas valve.

2. Shut off power to unit.

3. Remove burner access panel. (See Fig. 35.)

4. Disconnect gas piping at unit gas valve.

5. Remove wires connected to gas valve. Mark each wire.

6. Remove ignitor and sensor wires at the ignitor module.

7. Remove the mounting screw that attaches the burner rack

to the basepan. (See Fig. 34.)

8. Slide the burner rack out of the unit. (See Fig. 34

and 37.)

9. To reinstall, reverse the procedure outlined above.

BLOWER HOUSING

2 SETSCREWS (HIDDEN)

Fig. 36 — Removal of Motor and Blower Wheel

Fig. 37 — Burner Rack Removed

Page 47

Condenser Coil, Evaporator Coil, and Condensate Drain Pan —

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 45.

The coils are easily cleaned when dry; therefore, inspect and clean the coils either before or after each cooling season. 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 the soft brush attachment. Be careful not to bend the ﬁns. If coated with oil or grease, clean the coils with a mild detergent-andwater 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 inspecting 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.

Inspect the condenser coil, evapo-

Condenser Fan

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, replace all the panels. Start the unit, and observe at least one complete heating cycle and one complete cooling cycle to ensure proper operation. If discrepancies are observed in either or both operating cycles, or if a suspected malfunction has occurred, check each electrical component with theproper electrical instrumentation. Refer to the unit wiring label when making these checkouts.

NOTE: Refer to the heating and/or cooling sequence of operation in this publication as an aid in determining proper control operation.

RefrigerantCircuit— Inspectall 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 suspected, leak-test all refrigerant tubing using an electronicleakdetector, halide torch, or liquid-soap solution. If a refrigerant leak is detected, refer to Check for Refrigerant Leaks section on page 23.

If no refrigerant leaks are found and low cooling performance is suspected, refer to Checking and Adjusting Refrigerant Charge section on page 35.

Keep the condenser fan free from all obstructions to ensure proper cooling operation. Never place articles on top of the unit. Damage to unit may result.

1. Remove 2 screws at bottom and 2 screws along sides 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 leading edge is

5. Ensure that setscrew engages the ﬂat area on the motor shaft when tightening.

6. Replace grille.

⁄2in. in front of fan oriﬁce. See Fig. 23.

Electrical Controls and Wiring— Inspect and check

the electrical controls and wiring annually. Be sure to turn off the gas supply, and then the electrical power to the unit.

Gas Input — The gas input does not require checking

unless improper heating performance is suspected. If a problem exists, refer to Start-Up section on page 23.

EvaporatorAirﬂow — The heating and/or cooling air-

ﬂow does not require checking unless improper performance is suspected. If a problemexists, be surethat all supply-

and return-air grilles are open and free from obstructions, and that the air ﬁlter is clean. When necessary, refer to Evapo-

ratorAirﬂow and Airﬂow Adjustments section on page 35 to check the system airﬂow.

Metering Device —Acutrol™ Device — This me-

tering device is a ﬁxed oriﬁce and is located in the header to the evaporator coil.

Liquid LineStrainer— The liquid line strainer (to pro-

tect metering device) is made of wire mesh and located in the liquid line on the inlet side of the metering device.

Page 48

TROUBLESHOOTING

Cooling

SYMPTOM CAUSE REMEDY

Compressor and condenser fan will not start.

Compressor will not start but condenser fan runs.

Three-phase scroll compressor (Units 48SS048,060 and 48SX036-060 only) makes excessive noise, and there may be a low pressure differential.

Compressor cycles (other than normally satisfying thermostat).

Compressor operates continuously.

Excessive head pressure.

Head pressure too low.

Excessive suction pressure.

Suction pressure too low.

Power failure Call power company. Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker. Defective thermostat, contactor, transformer,

or control relay 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. Faulty wiring or loose connections in

compressor circuit Compressor motor burned out, seized, or

internal overload open Defective run/start capacitor, overload,

start relay One leg of 3-phase power dead Replace fuse or reset circuit breaker.

Scroll compressor is rotating in the wrong direction

Refrigerant overcharge or undercharge Recover refrigerant, evacuate system, and 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 Defective thermostat Replace thermostat. Faulty condenser-fan motor or capacitor Replace. Restriction in refrigerant system Locate restriction and remove. 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 Recover refrigerant, evacuate system, and recharge. Condenser coil dirty or restricted Clean coil or remove restriction. Dirty air ﬁlter Replace ﬁlter. Dirty condenser coil Clean coil. Refrigerant overcharged Recover excess refrigerant. Air in system Recover refrigerant, evacuate system, and recharge. Condenser air restricted or air short-cycling Determine cause and correct. Low refrigerant charge Check for leaks, repair and recharge. Compressor valves leaking Replace compressor. Restriction in liquid tube Remove restriction. High heat load Check for source and eliminate. Compressor valves leaking Replace compressor. Refrigerant overcharged Recover excess refrigerant. 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

Temperature too low in conditioned area Reset thermostat. Outdoor ambient below 40 F Install low-ambient kit. Field-installed ﬁlter-drier restricted Replace.

Replace component.

Check wiring and repair or replace. Determine cause. Replace compressor. Determine cause and replace.

Determine cause. Correct the direction of rotation by reversing the

3-phase power leads to the unit. Shut down unit to allow pressures to equalize.

recharge to capacities shown on nameplate.

Determine cause and replace.

necessary.

Page 49

Cooling (cont)

SYMPTOM CAUSE REMEDY

Integrated control motor (units 48SX048,060 208/230 v) IFM does not run.

Integrated control motor (units 48SX048,060 208/230 v) IFM runs when it should be off.

Integrated control

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 Motor programmed with a delay

Connectors should snap easily; do not force.

Allow a few minutes for motor to shut off.

proﬁle With thermostat in OFF the voltage

on G,Y1,Y/Y2,W with respect to common, should be

⁄2of actual

If measured voltage is more than1⁄2, the thermostat is incompatible with motor. If voltage is less than1⁄2, the motor has failed.

low voltage supply Water dripping into motor Verify proper drip loops in connector wires.

motor (units 48SX048,060 208/230 v) IFM operation is

Connectors not ﬁrmly seated Gently pull wires individually to be sure they

are crimped into the housing.

intermittent.

IFM — Evaporator (Indoor) Fan Motor

Heating

SYMPTOM CAUSE REMEDY

Burners will not ignite. Water in gas line Drain. Install drip leg.

No power to furnace Check power supply fuses, wiring, or circuit breaker. No 24-v power supply to control

circuit Miswired or loose connections Check all wiring and wirenut connections.

Burned-out heat anticipator in thermostat

Broken thermostat wire Run continuity check. Replace wire if necessary. Misaligned spark electrodes Check ﬂame ignition and sense electrode positioning.

No gas at main burners 1. Check gas line for air. Purge as necessary.

Inadequate heating. Dirty air ﬁlter Clean or replace ﬁlter as necessary.

Gas input to furnace too low Check gas pressure at manifold. Match with that on Unit undersized for application Replace with proper unit or add additional unit.

Restricted airﬂow Clean or replace ﬁlter. Remove any restriction. Blower speed too low Use faster speed tap if available, or install alternate

Limit switch cycles main burners Check rotation of blower, thermostat heat antic-

Poor ﬂame characteristics. Incomplete combustion results in:

Aldehyde odors, carbon monoxide, sooting ﬂame, ﬂoating ﬂame

Check transformer. NOTE: Some transformers have internal overcurrent

protection that requires a cool-down period to reset.

Replace thermostat.

Adjust as necessary.

NOTE: After purging gas line of air, wait at least 5 minutes for any gas to dissipate before attempting to light unit.

2. Check gas valve.

unit nameplate.

motor. ipator settings, temperature rise of unit. Adjust as

necessary.

1. Tighten all screws around burner compartment.

2. Cracked heat exchanger. Replace.

3. Unit overﬁred. Reduce input (change oriﬁces or adjust gas line or manifold pressure).

4. Check burner alignment.

Page 50

SYMPTOM CAUSE REMEDY

Hardware failure. (LED OFF)

Limit switch fault. (LED 2 ﬂashes)

Flame sense fault. (LED 3 ﬂashes)

4 consecutive limit switch faults. (LED 4 ﬂashes)

Ignition lockout. (LED 5 ﬂashes)

Induced-draft motor fault. (LED 6 ﬂashes)

Rollout switch fault. (LED 7 ﬂashes)

Internal control fault. (LED 8 ﬂashes)

LED Troubleshooting — Error Code

Loss of power to control module (IGC).

High temperature limit switch is open.

The IGC sensed ﬂame that should not be present.

Inadequate airﬂow to unit. Check operation of indoor (evaporator) fan motor and

Unit unsuccessfully attempted ignition for 15 minutes.

IGC does not sense that induceddraft motor is operating.

Rollout switch has opened. Rollout switch will automatically reset, but IGC will

Microprocessor has sensed an error in the software or hardware.

Check 5 amp fuse on IGC, power to unit, 24-v circuit breaker, and transformer. Units without a 24-v circuit breaker have an internal overload in the 24-v transformer. If the overload trips, allow 10 minutes for automatic reset.

Check the operation of the indoor (evaporator) fan motor. Ensure that the supply-air temperature rise is in accordance with the range on the unit nameplate.

Reset unit. If problem persists, replace control board.

that supply-air temperature rise agrees with range on unit nameplate information.

Check ignitor and ﬂame sensor electrode spacing, gaps, etc. Ensure that ﬂame sense and ignition wires are properly terminated. Verify that unit is obtaining proper amount of gas.

Check for proper voltage. If motor is operating, check the speed sensor plug/IGC Terminal J2 connection. Proper connection: PIN 1 — White, PIN 2 — Red, PIN 3 — Black.

continue to lockout unit. Check gas valve operation. Ensure that induced-draft blower wheel is properly secured to motor shaft. Reset unit at unit disconnect.

If error code is not cleared by resetting unit power, replace the IGC.

If the IGC must be replaced, be sure to ground yourself to dissipate any electrical charge that may be present before handling new control board. The IGC is sensitive to static electricity andmay bedamaged ifthe necessaryprecautions arenot taken.

SERVICE TRAINING

Packaged Service Training programs are an excellent way to increase your knowledge of the equipment discussed in this manual, including:

• Unit Familiarization

• Installation Overview

A large selection of product, theory, and skills programs are available, using popular video-based formats and materials. All include video and/or slides, plus companion book.

Classroom Service Training which includes ‘‘hands-on’’ experience with the products in our labs can mean increased conﬁdence that really pays dividends in faster troubleshooting and fewer callbacks. Course descriptions and schedules are in our catalog.

IMPORTANT: Refer to Heating troubleshooting chart for additional troubleshooting analysis.

LEGEND

IGC — Integrated Gas Unit Controller LED — Light-Emitting Diode

• Maintenance

• Operating Sequence

CALL FOR FREE CATALOG 1-800-962-9212

[ ] Packaged Service Training [ ] Classroom Service Training

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

Book 1 4 Tab 1a 6a

PC 111 Catalog No. 534-721 Printed in U.S.A. Form 48SS,SX-12SI Pg 50 9-98 Replaces: 48SS,SX-11SI

Page 51

Page 52

I. PRELIMINARY INFORMATION

START-UP CHECKLIST

(Remove and Store in Job File)

MODEL NO.: DATE:

SERIAL NO.: TECHNICIAN:

II. PRE-START-UP (insert checkmark in box as each item is completed)

M VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT M VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS M CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS M CHECK GAS PIPING FOR LEAKS M CHECK THAT INDOOR (EVAPORATOR) AIR FILTER IS CLEAN AND IN PLACE M VERIFY THAT UNIT INSTALLATION IS LEVEL M CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE AND SETSCREW

TIGHTNESS

III. START-UP

ELECTRICAL

SUPPLY VOLTAGE L1-L2 COMPRESSOR AMPS L1 L2 L3 COMPRESSOR AMPS L1 L2 L3 INDOOR (EVAPORATOR) FAN AMPS

L2-L3 L3-L1

TEMPERATURES

OUTDOOR (CONDENSER) AIR TEMPERATURE RETURN-AIR TEMPERATURE

DB WB

COOLING SUPPLY AIR GAS HEAT SUPPLY AIR

PRESSURES

GAS INLET PRESSURE GAS MANIFOLD PRESSURE REFRIGERANT SUCTION REFRIGERANT DISCHARGE

IN. WG IN. WG PSIG

PSIG

M VERIFY REFRIGERANT CHARGE USING CHARGING TABLES

M VERIFY THAT 3-PHASE SCROLL COMPRESSOR (48SS048,060 AND 48SX036-060 UNITS) ROTATING IN

CORRECT DIRECTION

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

Book 1 4 Tab 1a 6a

PC 111 Catalog No. 534-721 Printed in U.S.A. Form 48SS,SX-12SI Pg CL-1 9-98 Replaces: 48SS,SX-11SI

CUT ALONG DOTTED LINE CUT ALONG DOTTED LINE

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Carrier 48SS018-060, 48SX024-060 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual