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

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.

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

F

in./mm

9

⁄16/420.7 1815⁄16/481.0

16

9

⁄16/522.3 2215⁄16/582.6

20

ELECTRICAL

CHARACTERISTICS

G

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

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

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

F

in./mmGin./mm

7

⁄8/504.8 221⁄4/565.4

19

7

⁄8/606.4 261⁄4/666.8

23

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

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

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

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, 460-3-60 438 199 113/51 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

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

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

6

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

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

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

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

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)

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

9

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.

10

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

11

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.

12

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

3

⁄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

3

⁄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

x

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

1

⁄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.

1

An

⁄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

1

⁄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.

1

⁄2in., follow recommendations

13

Table 1 — Physical Data — Unit 48SS

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

1

⁄

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

2

1

⁄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

⁄

4

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

1

⁄

4

1

⁄

4

1

⁄

2

1

⁄

4

1

2

⁄

2

1

⁄

4

1

2

⁄

2

1

⁄

4

3333

1

⁄

2

1

⁄

2

1

⁄

2

1

⁄

2

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

1

⁄

2

31⁄

2

31⁄

2

31⁄

2

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.

1

⁄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)

3

⁄

3

4

⁄

4

3

⁄

3

4

⁄

4

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

3

⁄

3

4

⁄

3

4

⁄

3

4

⁄

4

1111

14

Table 2 — Physical Data — Unit 48SX

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

1

⁄

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

1

⁄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

⁄

4

1

⁄

4

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

2

1

⁄

4

1

2

⁄

2

1

⁄

4

1

2

⁄

2

1

⁄

4

3333

1

⁄

2

1

⁄

2

1

⁄

2

1

⁄

2

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

1

⁄

2

31⁄

2

31⁄

2

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.

1

⁄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)

3

⁄

4

3

⁄

3

4

⁄

4

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

2

3

⁄

4

44445555

3

⁄

3

4

⁄

3

4

⁄

4

3

⁄

4

1111

15

(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.

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