48SS018-060
48SX024-060
Single Package Gas Heating/
Electric Cooling Units
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
Fig. 1 — Unit 48SX Shown With Optional Base Rail
Untrained personnel can perform basic maintenance func-
tions of cleaning coils and filters. All other operations should
be performed by trained service personnel. When working
on air-conditioning equipment, observe precautions in the
literature, tags and labels attached to the unit, and other safety
precautions that may apply.
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire ex-
tinguisher available for all brazing operations.
• CONTROL VOLTAGE CONNECTIONS;
INTEGRATED CONTROL MOTOR (ICM)
UNITS
• HEAT ANTICIPATOR SETTING
• TRANSFORMER PROTECTION
Improper installation, adjustment, alteration, service, main-
tenance, or use can cause carbon monoxide poisoning,
fire, or an explosion which can result in personal injury
or unit damage. Consult a qualified installer, service agency,
or gas supplier for information or assistance. The quali-
fied installer or agency must use only factory-authorized
kits or accessories when modifying this product.
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22,23
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23-44
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44-47
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 48-50
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-1
NOTE TO INSTALLER — Before the installation, READ
THESE INSTRUCTIONS CAREFULLY AND COM-
PLETELY. Also, make sure the User’s Manual and Replace-
ment Guide are left with the unit after installation. The fur-
nace is NOT to be used for temporary heating of buildings
or structures under construction.
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 cool-
ing units designed for outdoor installation. See Fig. 2-9
(pages 2-9) for unit dimensions. All unit sizes have dis-
charge openings for both horizontal and downflow configu-
rations, and are factory shipped with all 4 duct openings covered.
Units may be installed either on a rooftop or a ground-level
cement slab. See Fig. 10 for roof curb dimensions.
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical com-
ponents. Only trained and qualified personnel should install,
repair, or service air-conditioning equipment.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 PC 111 Catalog No. 534-721 Printed in U.S.A. Form 48SS,SX-12SI Pg 1 9-98 Replaces: 48SS,SX-11SI
Tab 1a 6a
4
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REQ’D CLEARANCES FOR SERVICING. in. (mm)
Duct panel .
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Unit top .
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. 36 (914)
. 36 (914)
. 36 (914)
Side opposite ducts
Compressor access
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(Except for NEC requirements)
REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)
Maximum extension of overhangs .
Unit top .
Duct side of unit
Side opposite ducts
Bottom of unit
Flue panel
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. 14 (356)
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. 36 (914)
NEC REQ’D CLEARANCES. in. (mm)
Between units, control box side .
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. 42 (1067)
. 36 (914)
Unit and ungrounded surfaces, control box side
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Unit and block or concrete walls and other grounded
surfaces, control box side
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. 42 (1067)
CORNER WEIGHT
(lb/kg)
UNIT HEIGHT
(in./mm)
UNIT WEIGHT
ELECTRICAL
CHARACTERISTICS
UNIT
lb
kg
A
B
C
D
E
48SS018040
208/230-1-60
208/230-1-60
208/230-1-60
296
327
339
344
356
360
372
399
411
135
149
155
157
162
164
169
181
187
87/40
68/31
49/22
52/24
53/24
71/32
82/37
85/39
92/42
95/43
82/37
59/27
46/21
49/22
53/24
60/27
69/31
72/33
81/37
84/38
27.4/697
27.4/697
27.4/697
27.4/697
27.4/697
27.4/697
27.4/697
31.4/798
31.4/798
48SS024040
103/47
106/48
106/48
102/46
92/42
129/59
132/60
132/60
123/56
117/53
120/55
125/57
128/58
48SS024060
48SS030040
208/230-1-60, 208/230-3-60
208/230-1-60, 208/230-3-60
48SS030060/080
48SS036060/080
48SS036100/120
48SS042060/080
48SS042100/120
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
95/43
101/46
104/47
LEGEND
CENTER OF GRAVITY in./mm
F
G
UNIT
CG
COND
LV
—
—
—
Center of Gravity
Condenser
MAT’L
NEC
REQ’D
—
—
—
Material
National Electrical Code
Required
in./mm
in./mm
X
Y
Z
48SS018040
25.04/636
22.72/577
Low Voltage
48SS024040
26.90/683.3 20.17/512.3
NOTES:
48SS024060
26.82/681.2 20.22/513.6
197⁄8/504.8 221⁄4/565.4 26.57/674.9 20.1 /509.3 13.16/334.3
26.93/684 21.1 /535.4
1. Clearances must be maintained to prevent recirculation of air from outdoor-
48SS030040
fan discharge.
2. Adequate clearance around air openings into combustion chamber must
be provided.
48SS030060/080
48SS036060/080
48SS036100/120
48SS042060/080
48SS042100/120
27.31/693.7 21.0 /532.6
27.23/691.6 21.0 /533.1
26.87/682.5 21.0 /533.1
237⁄8/606.4 261⁄4/666.8
14.96/380
26.81/681
21.0 /533.7
Fig. 3 — 48SS018-042 With Optional Base Rail, Unit Dimensions
3
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REQ’D CLEARANCES FOR SERVICING. in. (mm)
Duct panel .
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Unit top .
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. 36 (914)
. 36 (914)
. 36 (914)
Side opposite ducts
Compressor access
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(Except for NEC requirements)
REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)
Maximum extension of overhangs .
Unit top .
Duct side of unit
Side opposite ducts
Bottom of unit
Flue panel
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. 48 (1219)
. 14 (356)
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. 36 (914)
NEC REQ’D CLEARANCES. in. (mm)
Between units, control box side .
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. 42 (1067)
. 36 (914)
Unit and ungrounded surfaces, control box side
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Unit and block or concrete walls and other grounded
surfaces, control box side
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. 42 (1067)
CORNER WEIGHT
(lb/kg)
UNIT WEIGHT
ELECTRICAL
CHARACTERISTICS
UNIT
lb
kg
A
B
C
D
48SS048080
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
414
426
453
465
188
193
206
211
107/49
110/50
117/53
120/55
83/38
86/39
93/42
96/44
158/72
159/72
167/76
167/76
66/30
71/32
76/35
82/37
48SS048100/120/140
48SS060080
48SS060100/120/140
LEGEND
CENTER OF GRAVITY (in./mm)
UNIT
CG
—
—
—
Center of Gravity
Condenser
MAT’L
—
—
—
Material
X
Y
Z
COND
LV
NEC
National Electrical Code
Required
48SS048080
28.76/731
28.42/722
28.36/720
27.95/710
23.46/596
23.42/595
23.27/591
23.23/590
15.35/390
15.35/390
15.35/390
15.35/390
Low Voltage
REQ’D
48SS048100/120/140
48SS060080
NOTES:
1. Clearances must be maintained to prevent recirculation of air from outdoor-
48SS060100/120/140
fan discharge.
2. Adequate clearance around air openings into combustion chamber must
be provided.
Fig. 4 — 48SS048,060 Without Base Rail, Unit Dimensions
4
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REQ’D CLEARANCES FOR SERVICING. in. (mm)
Duct panel .
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. 0
Unit top .
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. 36 (914)
. 36 (914)
. 36 (914)
Side opposite ducts
Compressor access
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(Except for NEC requirements)
REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)
Maximum extension of overhangs .
Unit top .
Duct side of unit
Side opposite ducts
Bottom of unit
Flue panel
.
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. 48 (1219)
. 14 (356)
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. 36 (914)
NEC REQ’D CLEARANCES. in. (mm)
Between units, control box side .
.
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. 42 (1067)
. 36 (914)
Unit and ungrounded surfaces, control box side
.
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.
.
Unit and block or concrete walls and other grounded
surfaces, control box side
.
.
.
.
.
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.
.
. 42 (1067)
CORNER WEIGHT
(lb/kg)
UNIT WEIGHT
ELECTRICAL
CHARACTERISTICS
UNIT
lb
kg
A
B
C
D
48SS048080
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
438
450
477
489
199
205
217
222
113/51
116/53
123/56
126/57
89/40
92/42
99/45
102/46
164/75
165/75
173/79
173/79
72/33
77/35
82/37
88/40
48SS048100/120/140
48SS060080
48SS060100/120/140
LEGEND
CENTER OF GRAVITY (in./mm)
UNIT
CG
—
—
—
Center of Gravity
Condenser
MAT’L
NEC
REQ’D
—
—
—
Material
X
Y
Z
COND
National Electrical Code
Required
48SS048080
28.54/724.9
28.22/716.8
28.18/715.6
27.79/705.9
20.00/508
20.05/509.3
20.19/512.8
20.23/513.8
17.66/448.6
17.66/448.6
17.66/448.6
17.66/448.6
LV
NOTES:
Low Voltage
48SS048100/120/140
48SS060080
1. Clearances must be maintained to prevent recirculation of air from outdoor-
fan discharge.
48SS060100/120/140
2. Adequate clearance around air openings into combustion chamber must
be provided.
Fig. 5 — 48SS048,060 With Optional Base Rail, Unit Dimensions
5
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REQ’D CLEARANCES FOR SERVICING. in. (mm)
Duct panel .
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. 0
Unit top .
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. 36 (914)
. 36 (914)
. 36 (914)
Side opposite ducts
Compressor access
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(Except for NEC requirements)
REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)
Maximum extension of overhangs .
Unit top .
Duct side of unit
Side opposite ducts
Bottom of unit
Flue panel
.
.
.
.
.
.
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. 48 (1219)
. 14 (356)
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. 14 (356)
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. 36 (914)
NEC REQ’D CLEARANCES. in. (mm)
Between units, control box side .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
. 42 (1067)
. 36 (914)
Unit and ungrounded surfaces, control box side
.
.
.
.
.
.
.
.
Unit and block or concrete walls and other grounded
surfaces, control box side
.
.
.
.
.
.
.
.
.
.
.
.
. 42 (1067)
CORNER WEIGHT
(lb/kg)
UNIT WEIGHT
ELECTRICAL
CHARACTERISTICS
UNIT
lb
kg
A
B
C
D
48SX024040
208/230-1-60
208/230-1-60
333
345
336
348
366
378
151
157
153
158
166
172
104/47
107/49
97/44
100/45
94/43
97/44
50/23
53/24
66/30
69/31
84/38
87/40
130/59
133/60
118/54
121/55
117/53
120/55
49/22
52/24
55/25
58/26
71/32
74/34
48SX024060
48SX030040
208/230-1-60
48SX030060/080
48SX036060/080
48SX036100/120
208/230-1-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
LEGEND
CENTER OF GRAVITY (in./mm)
UNIT
CG
—
—
—
Center of Gravity
Condenser
MAT’L
NEC
REQ’D
—
—
—
Material
X
Y
Z
COND
National Electrical Code
Required
48SX024040
26.71/678
26.64/677
27.06/687
26.98/685
27.14/689
27.06/687
20.06/510
20.12/511
21.05/535
21.07/535
21.10/536
21.12/536
12.65/321
12.65/321
12.65/321
12.65/321
12.65/321
12.65/321
LV
Low Voltage
48SX024060
NOTES:
48SX030040
1. Clearances must be maintained to prevent recirculation of air from outdoor-
48SX030060/080
48SX036060/080
48SX036100/120
fan discharge.
2. Adequate clearance around air openings into combustion chamber must
be provided.
Fig. 6 — 48SX024-036 Without Base Rail, Unit Dimensions
6
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REQ’D CLEARANCES FOR SERVICING. in. (mm)
Duct panel
.
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. 0
Unit top
.
.
.
.
.
.
. 36 (914)
. 36 (914)
. 36 (914)
Side opposite ducts .
Compressor access .
.
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.
.
(Except for NEC requirements)
REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)
Maximum extension of overhangs .
Unit top
Duct side of unit
Side opposite ducts .
Bottom of unit
Flue panel .
.
.
.
.
.
.
.
.
.
.
.
. 48 (1219)
. 14 (356)
.
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. 2 (51)
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. 14 (356)
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. 0
.
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.
.
. 36 (914)
NEC REQ’D CLEARANCES. in. (mm)
Between units, control box side
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
. 42 (1067)
. 36 (914)
Unit and ungrounded surfaces, control box side
.
.
.
.
.
.
Unit and block or concrete walls and other grounded
surfaces, control box side
.
.
.
.
.
.
.
.
.
.
.
. 42 (1067)
CORNER WEIGHT
(lb/kg)
UNIT WEIGHT
ELECTRICAL
CHARACTERISTICS
UNIT
lb
kg
A
B
C
D
48SX024040
208/230-1-60
208/230-1-60
208/230-1-60
208/230-1-60
357
369
360
372
390
402
163
168
164
169
177
183
110/50
113/51
103/47
106/48
100/45
103/47
56/25
59/27
72/33
75/34
90/41
93/42
136/62
139/63
124/56
127/58
123/56
127/57
55/25
58/26
61/28
64/29
77/35
80/36
48SX024060
48SX030040
48SX030060/080
48SX036060/080
48SX036100/120
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
LEGEND
CENTER OF GRAVITY (in./mm)
UNIT
CG
—
—
—
Center of Gravity
Condenser
MAT’L
—
—
—
Material
X
Y
Z
COND
LV
NEC
National Electrical Code
Required
48SX024040
26.57/674.9
26.51/673.3
26.90/683.3
26.83/681.5
26.99/685.5
26.92/683.8
20.17/512.3
20.22/513.6
21.09/535.7
21.11/536.2
21.14/537.0
21.14/537.0
14.96/380.0
14.96/380.0
14.96/380.0
14.96/380.0
14.96/380.0
14.96/380.0
Low Voltage
REQ’D
48SX024060
NOTES:
48SX030040
1. Clearances must be maintained to prevent recirculation of air from outdoor-
48SX030060/080
48SX036060/080
48SX036100/120
fan discharge.
2. Adequate clearance around air openings into combustion chamber must
be provided.
Fig. 7 — 48SX024-036 With Optional Base Rail, Unit Dimensions
7
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REQ’D CLEARANCES FOR SERVICING. in. (mm)
Duct panel .
.
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. 0
Unit top .
.
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.
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.
. 36 (914)
. 36 (914)
. 36 (914)
Side opposite ducts
Compressor access
.
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.
(Except for NEC requirements)
REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)
Maximum extension of overhangs .
Unit top .
Duct side of unit
Side opposite ducts
Bottom of unit
Flue panel
.
.
.
.
.
.
.
.
.
.
.
.
.
. 48 (1219)
. 14 (356)
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. 2 (51)
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. 14 (356)
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. 36 (914)
NEC REQ’D CLEARANCES. in. (mm)
Between units, control box side .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
. 42 (1067)
. 36 (914)
Unit and ungrounded surfaces, control box side
.
.
.
.
.
.
.
.
Unit and block or concrete walls and other grounded
surfaces, control box side
.
.
.
.
.
.
.
.
.
.
.
.
. 42 (1067)
CORNER WEIGHT
(lb/kg)
UNIT WEIGHT
ELECTRICAL
CHARACTERISTICS
UNIT
lb
kg
A
B
C
D
48SX042060/080
48SX042100/120
48SX048080
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60
391
403
422
434
453
465
178
183
192
197
206
211
100/45
103/47
109/50
112/51
117/53
120/55
91/41
94/43
85/39
88/40
93/42
96/44
120/55
123/56
158/72
161/73
167/76
167/76
80/36
83/38
70/32
73/33
76/35
82/37
48SX048100/120/140
48SX060080
48SX060100/120/140
208/230-1-60, 208/230-3-60
LEGEND
CENTER OF GRAVITY (in./mm)
UNIT
CG
—
Center of Gravity
Condenser
MAT’L
—
—
—
Material
X
Y
Z
COND
LV
—
—
NEC
National Electrical Code
Required
48SX042060/080
48SX042100/120
48SX048080
26.66/677
26.61/676
28.45/723
28.35/720
28.36/720
27.95/710
21.19/538
21.21/539
19.95/507
19.99/508
23.27/591
23.23/590
15.35/390
15.35/390
15.35/390
15.35/390
15.35/390
15.35/390
Low Voltage
REQ’D
NOTES:
1. Clearances must be maintained to prevent recirculation of air from outdoor-
48SX048100/120/140
48SX060080
fan discharge.
2. Adequate clearance around air openings into combustion chamber must
be provided.
48SX060100/120/140
Fig. 8 — 48SX042-060 Without Base Rail, Unit Dimensions
8
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REQ’D CLEARANCES FOR SERVICING. in. (mm)
Duct panel .
.
.
.
.
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. 0
Unit top .
.
.
.
.
.
.
.
.
. 36 (914)
. 36 (914)
. 36 (914)
Side opposite ducts
Compressor access
.
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.
.
.
.
.
.
.
(Except for NEC requirements)
REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)
Maximum extension of overhangs .
.
.
.
.
.
.
.
.
.
.
.
.
.
. 48 (1219)
. 14 (356)
Unit top .
Duct side of unit
Side opposite ducts
Bottom of unit
.
.
.
.
.
.
.
.
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.
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. 2 (51)
. 14 (356)
. 0
. 36 (914)
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.
Flue panel
.
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.
.
.
LEGEND
CG
—
—
—
—
—
—
Center of Gravity
Condenser
COND
LV
Low Voltage
Material
National Electrical Code
Required
MAT’L
NEC
REQ’D
CORNER WEIGHT
(lb/kg)
UNIT WEIGHT
ELECTRICAL
CHARACTERISTICS
UNIT
lb
kg
A
B
C
D
48SX042060,080
48SX042100,120
48SX048080
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60
415
427
446
458
477
489
189
194
293
208
217
222
106/48
109/50
115/52
118/54
123/56
126/57
97/44
100/45
91/41
94/43
99/45
102/46
126/57
129/59
164/75
167/76
173/79
173/79
86/39
89/40
76/35
79/36
82/37
88/40
48SX048100/120/140
48SX060080
48SX060100/120/140
208/230-1-60, 208/230-3-60
NOTES:
CENTER OF GRAVITY (in./mm)
1. Clearances must be maintained to prevent recirculation of air from outdoor-
UNIT
X
Y
Z
fan discharge.
2. Adequate clearance around air openings into combustion chamber must be
provided.
48SX042060,080
48SX042100,120
48SX048080
26.55/674.4
26.50/673.0
28.25/717.6
28.16/715.3
28.18/715.6
27.79/705.9
21.22/539.0
21.24/539.6
20.04/509.0
20.08/510.0
20.19/512.8
20.23/513.8
17.66/448.6
17.66/448.6
17.66/448.6
17.66/448.6
17.66/448.6
17.66/448.6
NEC REQ’D CLEARANCES. in. (mm)
Between units, control box side .
Unit and ungrounded surfaces, control box side
Unit and block or concrete walls and other grounded
surfaces, control box side
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
. 42 (1067)
. 36 (914)
48SX048100/120/140
48SX060080
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
. 42 (1067)
48SX060100/120/140
Fig. 9 — 48SX042-060 With Optional Base Rail, Unit Dimensions
9
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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 ap-
plicable fire codes.
RECEIVING AND INSTALLATION
Step 1 — Check Equipment
IDENTIFY UNIT — The unit model number and serial num-
ber are stamped on unit identification plate. Check this
information against shipping papers and job data.
A minimum clearance is not required around ductwork.
Cabinet return-air static shall not exceed −.25 in. wg.
INSPECT SHIPMENT — Inspect for shipping damage while
unit is still on shipping pallet. If unit appears to be damaged
or is torn loose from its anchorage, have it examined by trans-
portation inspectors before removal. Forward claim papers
directly to transportation company. Manufacturer is not re-
sponsible for any damage incurred in transit.
Check all items against shipping list. Immediately notify
the nearest Carrier Air Conditioning office if any item is
missing.
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 provi-
sions of local building code.
To prevent loss or damage, leave all parts in original pack-
ages until installation.
Step 2 — Provide Unit Support
ROOF CURB — Install accessory roof curb in accordance
with instructions shipped with curb. See Fig. 10 for roof curb
dimensions. Install insulation, cant strips, roofing, and flash-
ing. Ductwork must be attached to curb.
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 discharges it through the bank of louvers in the top 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. The mini-
mum 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.
IMPORTANT: The gasketing of the unit to the roof
curb is critical for a watertight seal. Install gasketing
material supplied with the roof curb. Improperly ap-
plied gasketing can also result in air leaks and poor
unit performance.
Curb should be level to within 1⁄4 inch. This is necessary
for unit drain to function properly. Refer to accessory roof
curb installation instructions for additional information as
required.
Do not place the unit where water, ice, or snow from an
overhang or roof will damage or flood the unit. Do not in-
stall the unit on carpeting, tile, or other combustible mate-
rials. The unit may be installed on wood flooring or on
Class A, B, or C roof covering materials.
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 ob-
struction of airflow by grass or shrubs. Do not secure the
unit to the slab except when required by local codes.
Step 5 — Rig and Place Unit
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 base-
pan 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.
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 po-
sition 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 be-
fore setting the unit in place. When a field-fabricated sup-
port is used, be sure that the support is level and properly
supports the unit.
Step 3 — Field Fabricate Ductwork — Secure all
ducts to roof curb and building structure on vertical dis-
charge units. Do not connect ductwork to unit. For horizon-
tal applications, unit is provided with flanges on the horizontal
openings. All ductwork should be secured to the flanges. In-
sulate and weatherproof all external ductwork, joints, and
roof openings with counter flashing and mastic in accor-
dance with applicable codes.
10
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PART NUMBER
CPRFCURB001A00
CPRFCURB002A00
CPRFCURB003A00
‘‘A’’
8Љ [203]
11Љ [279]
14Љ [356]
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.
Fig. 10 — Roof Curb Dimensions
11
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NOTICE TO RIGGERS
Hook rigging shackles through holes in lifting brackets, as shown in
Detail ‘‘A.’’ Lifting brackets to be centered around the unit center of
gravity. Use wood top skid when rigging, to prevent rigging straps
from damaging unit. Remove 4 screws to slide wood support through
rectangular hole in rail.
All panels must be in place when rigging.
UNIT
48SS
MAX
WEIGHT
A
B
C
Size
lb
kg
in.
mm
in.
mm
in.
mm
Fig. 11 — Slab Mounting Details
018
024
030
036
042
048
060
320 145
363 165
380 172
24.4 619 28.2 715
22.6 574 28.2 715
22.5 571 28.2 715
396 180 49.4 1255 22.2 563 28.2 715
435 197
474 215
513 233
22.6 574 32.2 816
21.2 538 38.2 969
21.6 549 38.2 969
UNIT
48SX
024
030
036
042
048
060
393 178
396 180
426 193
451 205
482 219
513 233
22.9 582 32.2 816
22.6 574 32.2 816
22.5 571 32.2 816
22.9 582 38.2 969
21.3 540 38.2 969
21.6 549 38.2 969
49.4 1255
Fig. 13 — Suggested Rigging for Units With
Optional Base Rail
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.
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.
All panels must be in place when rigging.
Never use lifting brackets when the temperature is be-
low −10 F.
UNIT
48SS
MAX
WEIGHT
A
B
C
Never exceed 200 lbs per bracket of lifting force.
Size
lb
kg
in.
mm
in.
mm
in.
mm
018
024
030
036
042
048
060
332 150
375 170
384 174
24.3 618 24.85 631
22.4 570 24.85 631
22.3 565 24.85 631
Never use lifting brackets for lifting other models of air-
conditioning units.
Lifting point should be directly over the unit center of
gravity.
408 185 49.4 1255 22.0 559 24.85 631
447 203
486 220
525 238
22.5 571 28.85 733
21.0 533 34.85 885
21.5 545 34.85 885
1. Position brackets as close to the corners of unit as pos-
sible. Be sure brackets are well outside of center of grav-
ity. (See Fig. 2, 4, 6, 8, and 12.).
2. Position paint protectors and foam strips between screws
and painted surface of unit. Tighten screws until they make
contact with the paint protectors.
UNIT
48SX
024
030
036
042
048
060
405 184
408 185
438 199
463 210
494 224
525 238
22.8 579
22.4 569
22.4 569
22.8 579
21.1 536
21.5 545
28.9
28.9
28.9
34.9
34.9
34.9
733
733
733
885
885
885
49.4 1255
3. Secure device or hook of sufficient strength to hole in 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 avail-
able, use spreader bars of sufficient length.
Fig. 12 — Suggested Rigging for Units Without
Base Rail
12
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UNITS WITH OPTIONAL BASE RAIL — Lifting holes
are provided in optional base rail as shown in Fig. 13. Op-
erating weights are shown in Tables 1 and 2. Refer to rig-
ging instructions on unit.
Protective wood support must be removed from unit be-
fore unit is mounted to curb. Remove 4 screws that secure
support above rigging holes in rails. Slide support out through
rectangular hole in rail. See Fig. 13.
to Provincial and local plumbing or 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 the 1⁄2-in. FPT gas inlet on
the manual shutoff or gas valve.
Step 6 — Connect Condensate Drain
NOTE: When installing condensate drain connection be sure
to comply with local codes and restrictions.
Model 48SS,SX disposes of condensate water through a
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 con-
cerning existing lines. Size gas supply piping for 0.5 in. wg
3
⁄
4
in. 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 conden-
sate trap at end of condensate connection to ensure proper
drainage. Make sure that the outlet of the trap is at least
1 in. lower than the drain-pan condensate connection to pre-
vent the pan from overflowing. See Fig. 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 con-
nection to ensure proper drainage. See Fig. 14. 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 over-
flowing. Prime the trap with water. Connect a drain tube us-
ing a minimum of 3⁄4-in. PVC or 3⁄4-in. copper pipe (all field-
supplied) 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.
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 applica-
tions, 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
⁄
4
inch in every 15 ft to prevent traps. Grade all hori-
zontal runs downward to risers. Use risers to connect to
heating section and to meter.
2. Protect all segments of piping system against physical and
thermal damage. Support all piping with appropriate straps,
hangers, etc. Use a minimum of one hanger every 6 ft.
For pipe sizes larger than 1⁄2 in., follow recommendations
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 gases as specified by local and/or national codes.
Never use Teflon tape.
Fig. 14 — Condensate Trap
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 be-
tween unit manual shutoff and external manual main shut-
off valve.
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 Man-
agement Districts which require NOx emissions of
40 nanograms/joule or less, kit CRLOWNOX001A00 must
be installed.
7. Pressure-test all gas piping in accordance with local and
national plumbing and gas codes before connecting pip-
ing to unit.
The venting system is designed to ensure proper vent-
ing. The flue hood assembly must be installed as indi-
cated in this section of the unit installation instructions.
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.
Install the flue hood as follows:
1. This installation must conform with local building codes
and with the National Fuel Gas Code (NFGC), ANSI Z223.1
(in Canada, CAN/CGAB149.1, and B149.2) or NFPA(Na-
tional Fire Protection Association) latest revision. Refer
13
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Table 1 — Physical Data — Unit 48SS
UNIT SIZE 48SS
018040
024040
024060
030040
030060
030080
036060
036080
036100
036120
NOMINAL CAPACITY (ton)
11⁄2
2
2
21⁄2
21⁄2
21⁄2
3
3
3
3
OPERATING WEIGHT (lb)
Without Base Rail
With Optional Base Rail
272
296
303
327
315
339
320
344
332
356
332
356
336
360
336
360
348
372
348
372
COMPRESSORS
Quantity
Rotary
1
Reciprocating
1
REFRIGERANT (R-22)
Charge (lb)
2.60
.030
2.75
.030
2.75
.030
3.40
.030
3.40
3.40
.030
4.30
.032
4.30
.032
4.30
.032
4.30
.032
REFRIGERANT METERING DEVICE
Orifice ID (in.)
Acutrol™ Device
.030
CONDENSER COIL
Rows...Fins/in.
Face Area (sq ft)
1...17
5.95
1...17
5.95
1...17
5.95
2...17
5.95
2...17
5.95
2...17
5.95
2...17
5.95
2...17
5.95
2...17
5.95
2...17
5.95
CONDENSER FAN
Nominal Cfm
1700
18
1700
18
1700
18
1900
18
1900
18
1900
18
1900
18
(1050)
1900
18
(1050)
1900
18
(1050)
1900
18
(1050)
Diameter (in.)
1
1
1
1
1
1
1
1
1
1
Motor Hp (Rpm)
⁄
8
(850)
⁄8
(850)
⁄8
(850)
⁄
8
(850)
⁄
8
(850)
⁄
8
(850)
⁄4
⁄
4
⁄
4
⁄
4
EVAPORATOR COIL
Rows Fins/in.
Face Area (sq ft)
3...15
1.83
3...15
2.29
3...15
2.29
3...15
2.29
3...15
2.29
3...15
2.29
3...15
3.06
3...15
3.06
3...15
3.06
3...15
3.06
EVAPORATOR FAN
Nominal Airflow (Cfm)
Size (in.)
Direct Drive
1000
600
800
800
1000
1000
1200
1200
1200
1200
10 x 10
10 x 10
10 x 10
10 x 10
10 x 10
10 x 10
10 x 10
10 x 10
10 x 10
10 x 10
1
1
1
1
1
1
1
1
1
1
Motor Hp
⁄4
⁄4
⁄
4
⁄
4
⁄
4
⁄4
⁄
2
⁄
2
⁄
2
⁄2
FURNACE SECTION*
Burner Orifice (Qty...drill size)
Natural Gas
Burner Orifice (Qty...drill size)
Propane Gas
1...32
1...41
1...32
1...41
2...40
2...47
1...32
1...41
2...40
2...47
2...32
2...42
2...40
2...47
2...32
2...42
2...30
2...40
3...32
3...42
RETURN-AIR FILTERS (in.)†
Throwaway
20 x 20
20 x 20
20 x 20
20 x 24
20 x 24
20 x 24
20 x 24
20 x 24
20 x 24
20 x 24
UNIT SIZE 48SS
042060 042080 042100 042120 048080 048100 048120 048140 060080 060100 060120 060140
NOMINAL CAPACITY (ton)
31⁄2
31⁄2
31⁄2
31⁄2
4
4
4
4
5
5
5
5
OPERATING WEIGHT (lb)
Without Base Rail
With Optional Base Rail
375
399
375
399
387
411
387
411
414
438
426
450
426
450
426
450
453
477
465
489
465
489
465
489
COMPRESSORS
Quantity
Reciprocating
1
Hermetic Scroll
1
REFRIGERANT (R-22)
Charge (lb)
5.20
.034
5.20
.034
5.20
.034
5.20
.034
6.50
.030
6.50
6.50
6.50
.030
7.00
.030
7.00
.030
7.00
.030
7.00
.030
REFRIGERANT METERING
DEVICE
Orifice ID (in.)
Acutrol Device
.030
.030
CONDENSER COIL
Rows...Fins/in.
Face Area (sq ft)
2...17
7.04
2...17
7.04
2...17
7.04
2...17
7.04
2...17
8.67
2...17
8.67
2...17
8.67
2...17
8.67
2...17
8.67
2...17
8.67
2...17
8.67
2...17
8.67
CONDENSER FAN
Nominal Cfm
1900
18
(1050)
1900
18
(1050)
1900
18
(1050)
1900
18
(1050)
2400
20
(1050)
2400
20
(1050)
2400
20
(1050)
2400
20
(1050)
2400
20
(1050)
2400
20
(1050)
2400
20
(1050)
2400
20
(1050)
Diameter (in.)
1
1
1
1
1
1
1
1
1
1
1
1
Motor Hp (Rpm)
⁄
4
⁄4
⁄
4
⁄
4
⁄3
⁄
3
⁄
3
⁄3
⁄
3
⁄
3
⁄3
⁄
3
EVAPORATOR COIL
Rows Fins/in.
Face Area (sq ft)
3...15
3.33
3...15
3.33
3...15
3.33
3...15
3.33
3...15
4.44
3...15
4.44
3...15
4.44
3...15
4.44
4...15
4.44
4...15
4.44
4...15
4.44
4...15
4.44
EVAPORATOR FAN
Nominal Airflow (Cfm)
Size (in.)
Direct Drive
1600 1600
1400
1400
1400
1400
1600
1600
1995
1995
1995
1995
10 x 10 10 x 10 10 x 10 10 x 10 10 x 10 10 x 10 10 x 10 10 x 10 10 x 11 10 x 11 10 x 11 10 x 11
3
3
3
3
3
3
3
3
Motor Hp
⁄
4
⁄4
⁄4
⁄
4
⁄4
⁄4
⁄
4
⁄4
1
1
1
1
FURNACE SECTION*
Burner Orifice (Qty...drill size)
Natural Gas
Burner Orifice (Qty...drill size)
Propane Gas
2...40
2...47
2...32
2...42
2...30
2...40
3...32
3...42
2...32
2...42
2...30
2...40
3...32
3...42
3...31
3...40
2...32
3...42
2...30
2...40
3...32
3...42
3...31
3...40
RETURN-AIR FILTERS (in.)†
Throwaway
24 x 24 24 x 24 24 x 24 24 x 24 24 x 30 24 x 30 24 x 30 24 x 30 24 x 30 24 x 30 24 x 30 24 x 30
*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.
14
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Table 2 — Physical Data — Unit 48SX
UNIT SIZE 48SX
024040
024060
030040
030060
030080
036060
036080
036100
036120
NOMINAL CAPACITY (ton)
2
2
21⁄2
21⁄2
21⁄2
3
3
3
3
OPERATING WEIGHT (lb)
Without Base Rail
With Optional Base Rail
333
357
345
369
336
360
348
372
348
372
366
390
366
390
378
402
378
402
COMPRESSORS
Quantity
Scroll
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
Orifice ID (in.)
Acutrol™ Device
.030
.034
.034
.030
.030
.032
.032
.032
.032
CONDENSER COIL
Rows...Fins/in.
Face Area (sq ft)
2...17
7.0
2...17
7.0
2...17
7.0
2...17
7.0
2...17
7.0
2...17
7.0
2...17
7.0
2...17
7.0
2...17
7.0
CONDENSER FAN
Nominal Cfm
2200
20
2200
20
2200
20
2200
20
2200
2200
20
2200
20
2200
20
2200
20
Diameter (in.)
20
1
1
1
1
1
1
1
1
1
Motor Hp (Rpm)
⁄4
(1100)
⁄
4
(1100)
⁄4
(1100)
⁄
4
(1100)
⁄
4
(1100)
⁄4
(1100)
⁄
4
(1100)
⁄4
(1100)
⁄
4
(1100)
EVAPORATOR COIL
Rows Fins/in.
Face Area (sq ft)
2...15
3.6
2...15
3.6
3...15
2.7
3...15
2.7
3...15
2.7
4...15
3.6
4...15
3.6
4...15
3.6
4...15
3.6
EVAPORATOR FAN*
Nominal Airflow (Cfm)
Size (in.)
Direct Drive
1000
800
800
1000
1000
1200
1200
1200
1200
10 x 10
10 x 10
10 x 10
10 x 10
10 x 10
10 x 10
10 x 10
10 x 10
10 x 10
1
1
1
1
1
1
1
1
1
Motor Hp
⁄4
⁄
4
⁄
4
⁄4
⁄
4
⁄2
⁄
2
⁄2
⁄
2
FURNACE SECTION†
Burner Orifice (Qty...drill size)
Natural Gas
Burner Orifice (Qty...drill size)
Propane Gas
1...32
1...41
2...40
2...47
1...32
1...41
2...40
2...47
2...32
2...42
2...40
2...47
2...32
2...42
2...30
2...40
3...32
3...42
RETURN-AIR FILTERS (in.)**
Disposable
24 x 24
24 x 24
24 x 24
24 x 24
24 x 24
24 x 24
24 x 24
24 x 24
24 x 24
UNIT SIZE 48SX
042060
042080
042100
042120
048080
048100
048120
048140
060080 060100 060120 060140
NOMINAL CAPACITY (ton)
31⁄2
31⁄2
31⁄2
31⁄2
4
4
4
4
5
5
5
5
OPERATING WEIGHT (lb)
Without Base Rail
With Optional Base Rail
391
415
391
415
403
427
403
427
422
446
434
458
434
458
434
458
453
477
465
489
465
489
465
489
COMPRESSORS
Quantity
Scroll
1
REFRIGERANT (R-22)
Charge (lb)
5.7
5.7
5.7
5.7
5.8
5.8
5.8
5.8
7.00
.030
7.00
.030
7.00
.030
7.00
.030
REFRIGERANT METERING
DEVICE
Orifice ID (in.)
Acutrol Device
.034
.034
.034
.034
.034
.034
.034
.034
CONDENSER COIL
Rows...Fins/in.
Face Area (sq ft)
2...17
8.7
2...17
8.7
2...17
8.7
2...17
8.7
2...17
8.7
2...17
8.7
2...17
8.7
2...17
8.7
2...17
8.67
2...17
8.67
2...17
8.67
2...17
8.67
CONDENSER FAN
Nominal Cfm
2400
20
2400
20
2400
2400
20
2400
20
2400
20
2400
20
2400
2400
20
2400
20
2400
20
2400
20
(1050)
Diameter (in.)
20
20
1
1
1
1
1
1
1
1
1
Motor Hp (Rpm)
⁄
4
(1100)
⁄
4
(1100)
⁄
4
(1100)
⁄4
(1100)
⁄4
(1100)
⁄
4
(1100)
⁄
4
(1100)
⁄
4
(1100)
⁄3
(1050) 1
⁄
3
(1050) 1
⁄
3
(1050) 1
⁄
3
EVAPORATOR COIL
Rows Fins/in.
Face Area (sq ft)
3...15
4.4
3...15
4.4
3...15
4.4
3...15
4.4
4...15
4.4
4...15
4.4
4...15
4.4
4...15
4.4
4...15
4.44
4...15
4.44
4...15
4.44
4...15
4.44
EVAPORATOR FAN*
Nominal Airflow (Cfm)
Size (in.)
Direct Drive
1600 1600
10 x 10 10 x 10
1400
1400
1400
1400
1600
1600
1995
1995
1995
1995
10 x 10
10 x 10
10 x 10
10 x 10
10 x 10
10 x 10
10 x 11 10 x 11 10 x 11 10 x 11
3
3
3
3
3
3
3
3
Motor Hp
⁄
4
⁄
4
⁄
4
⁄4
⁄4
⁄4
⁄
4
⁄
4
1
1
1
1
FURNACE SECTION†
Burner Orifice (Qty...drill size)
Natural Gas
Burner Orifice (Qty...drill size)
Propane Gas
2...40
2...47
2...32
2...42
2...30
2...40
3...32
3...42
2...32
2...42
2...30
2...40
3...32
3...42
3...31
3...40
2...32
3...42
2...30
2...40
3...32
3...42
3...31
3...40
RETURN-AIR FILTERS (in.)**
Disposable
24 x 30
24 x 30
24 x 30
24 x 30
24 x 30
24 x 30
24 x 30
24 x 30
24 x 30 24 x 30 24 x 30 24 x 30
*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.
15
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(Text continued from page 13)
CONFIGURING UNITS FOR DOWNFLOW (VERTICAL)
DISCHARGE
Unstable operation may occur when the gas valve
and manifold assembly are forced out of position while
connecting improperly-routed rigid gas piping to the
gas valve. Use a backup wrench when making con-
nection to avoid strain on, or distortion of, the gas
control piping.
Before performing service or maintenance operations on
the system, turn off main power to unit or electrical shock
could result.
1. Open all electrical disconnects before starting any serv-
ice 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).
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 mini-
mum of 2 in. outside the unit casing.
4. Using a straight edge and sharp knife, cut and remove
the insulation around the perimeter of the cover. Re-
move and save 5 screws securing the cover to the base-
pan 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.
Never use a match or other open flame when check-
ing for gas leaks. Never purge gas line into com-
bustion chamber. Failure to follow this warning could
result in an explosion causing personal injury or death.
6. Remove and discard 2 screws which secure vertical dis-
charge opening cover to basepan (Fig. 19). Slide cover
forward to disengage, then tilt and remove cover through
vertical discharge opening in bottom of unit. Discard duct
cover (Fig. 20).
8. Check for gas leaks at the field-installed and factory-
installed gas lines after all piping connections have been
completed. Use soap-and-water solution (or method speci-
fied by local codes and/or regulations).
Collect ALL screws that were removed. Do not leave
screws on rooftop as permanent damage 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 se-
cured to the basepan with aluminum tape. Applicable
local codes may require aluminum tape to prevent ex-
posed fiberglass.
9. Cover both horizontal duct openings with the duct cov-
ers from Steps 2 and 5. Make sure opening is air- and
watertight.
10. After completing unit conversion, perform all safety checks
and power up unit.
Fig. 15 — Sediment Trap
NOTE: The design and installation of the duct system must
be in accordance with the standards of the NFPA for instal-
lation of nonresidence-type air conditioning and ventilating
systems, NFPA 90A or residence-type, NFPA 90B; and/or
local codes and residence-type, NFPA 90B; and/or local codes
and ordinances.
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.
16
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Table 3 — Maximum Gas Flow Capacity*
NOMINAL
IRON PIPE,
SIZE
LENGTH OF PIPE, FT†
INTERNAL
DIAMETER
(in.)
10
20
30
97
40
82
50
73
60
66
70
61
80
57
90
53
100
125
150
175
200
(in.)
1
⁄
⁄
2
.622
.824
175
360
120
250
50
103
195
400
620
44
93
40
84
—
—
3
4
200
375
170
320
600
990
151
285
580
900
138
260
530
810
125
240
490
750
118
220
460
690
110
205
430
650
77
72
1
11⁄4
11⁄2
1.049
1.380
1.610
680
465
175
360
550
160
325
500
145
300
460
135
280
430
1400
2100
950
770
1460
1180
*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.
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
17
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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 ap-
proved for electrical ground when installed in accor-
dance with NEC (National Electrical Code) ANSI/
NFPA (latest edition) (in Canada, Canadian Electrical
Code CSA [Canadian Standards 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 dam-
age to the unit being installed:
Fig. 20 — Vertical Discharge Cover Removed
1. Make all electrical connections in accordance with NEC
ANSI/NFPA (latest edition) and local electrical codes gov-
erning such wiring. In Canada, all electrical connections
must be in accordance with CSA standard C22.1 Cana-
dian Electrical Code Part 1 and applicable local codes.
Refer to unit wiring diagram.
2. Use only copper conductor for connections between field-
supplied electrical disconnect switch and unit. DO NOT
USE ALUMINUM WIRE.
3. Be sure that high-voltage power to unit is within oper-
ating 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, ensure phases are balanced within 2%. Con-
sult local power company for correction of improper volt-
age and/or phase imbalance.
Adhere to the following criteria when selecting, sizing,
and installing the duct system:
1. Units are shipped with all 4 duct openings covered. Re-
move 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 fil-
ter rack installed in the return-air side of the unit. Rec-
ommended 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 uncon-
ditioned space, and use vapor barrier in accordance with
latest issue of Sheet Metal and Air Conditioning
Contractors NationalAssociation (SMACNA) andAir Con-
ditioning Contractors of America (ACCA) minimum in-
stallation standards for heating and air-conditioning sys-
tems. Secure all ducts to building structure.
HIGH-VOLTAGE CONNECTIONS — The unit must have
a separate electrical service with a field-supplied, water-
proof, disconnect switch mounted at, or within sight from,
the unit. Refer to the unit rating plate for maximum fuse/
circuit breaker size and minimum circuit amps (ampacity)
for wire sizing. See Tables 4A and 4B for electrical data.
The field-supplied disconnect switch box may 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.
7. Flash, weatherproof, and vibration-isolate all openings in
building structure in accordance with local codes and good
building practices.
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 la-
bel and Fig. 21.
18
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Table 4A — Electrical Data — Unit 48SS
VOLTAGE
RANGE
OUTDOOR-FAN INDOOR-FAN
UNIT
SIZE
48SS
AWG 60 C
MIN WIRE
SIZE
COMPRESSOR
POWER SUPPLY
MAX WIRE
MOTOR
FLA
0.7
0.7
1.4
1.4
1.4
1.4
0.8
1.4
1.4
0.8
2.1
2.1
2.1
2.1
1.1
1.1
2.1
2.1
1.1
MOTOR
FLA
1.8
2.0
2.3
2.0
2.8
2.8
1.4
4.0
4.0
2.0
5.0
5.0
5.0
5.0
2.3
2.3
6.8
6.8
3.2
V-PH-Hz
LENGTH (ft)
Min Max
187 253
187 253
187 253
187 253
187 253
187 253
414 506
187 253
187 253
414 506
RLA
8.3
LRA
45.0
61.0
82.0
66.0
96.0
75.0
40.0
104.0
91.0
42.0
124.0
129.0
93.0
99.0
46.5
50.0
169.0
123.0
62.0
MCA
12.9
18.2
21.4
15.1
26.7
18.8
9.2
MOCP*
15
018
024
208/230-1-60
208/230-1-60
208/230-1-60
208/230-3-60
208/230-1-60
208/230-3-60
460-3-60
14
12
10
12
10
12
14
8
75
80
12.4
14.4
9.4
30
30
100
80
030
25
18.0
11.7
5.6
40
90
036
30
65
10
100
100
85
208/230-1-60
208/230-3-60
460-3-60
20.4
14.0
6.4
30.9
22.9
10.8
40.1
40.1
25.9
25.9
13.7
13.7
49.0
33.0
16.8
50
042
048
060
35
10
14
8
15
100
100
100
75
208/230-1-60† 187 253
208/230-1-60** 187 253
208/230-3-60† 187 253
208/230-3-60** 187 253
21.8
26.4
12.8
15.0
6.4
60
60
6
40
10
10
14
14
6
40
75
460-3-60†
460-3-60**
208/230-1-60
208/230-3-60
460-3-60
414 506
414 506
187 253
187 253
414 506
20
100
100
100
90
8.2
20
32.1
19.3
10.0
60
50
8
25
12
100
Example: Supply voltage is 460-3-60.
LEGEND
AB = 452 v
BC = 464 v
AC = 455 v
AWG
FLA
—
—
—
American Wire Gage
Full Load Amps
HACR
Heating, Air Conditioning and
Refrigeration
452 ϩ 464 ϩ 455
Average Voltage =
LRA
—
—
—
—
Locked Rotor Amps
Minimum Circuit Amps
Maximum Overcurrent Protection
Rated Load Amps
3
MCA
MOCP
RLA
1371
3
=
*Fuse or HACR Breaker.
† Carrier Scroll Compressor.
**Copeland Scroll Compressor.
= 457
Determine maximum deviation from average voltage.
(AB) 457 − 452 = 5 v
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 As-
sociation) units may be fuse or circuit breaker.
(BC) 464 − 457 = 7 v
(AC) 457 − 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
2. Minimum wire size is based on 60 C copper wire. If other than
60 C wire is used, or if length exceeds wire length in table, de-
termine size from NEC.
7
% Voltage Imbalance = 100 x
457
3. Unbalanced 3-Phase Supply Voltage
= 1.53%
Never operate a motor where a phase imbalance in supply volt-
age is greater than 2%. Use the following formula to determine
the percentage of voltage imbalance.
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
% Voltage imbalance
IMPORTANT: If the supply voltage phase imbalance is
more than 2%, contact your local electric utility company
immediately.
max voltage deviation from average voltage
= 100 x
average voltage
19
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Table 4B — Electrical Data — Unit 48SX
VOLTAGE
RANGE
OUTDOOR-FAN INDOOR-FAN
UNIT
SIZE
48SX
AWG 60 C
MIN WIRE
SIZE
COMPRESSOR
POWER SUPPLY
MAX WIRE
MOTOR
FLA
1.4
MOTOR
FLA
2.0
V-PH-Hz
LENGTH (ft)
Min Max
RLA
12.9
15.0
16.7
10.9
5.4
LRA
62.5
76.0
95.0
75.0
40.0
104.0
88.0
44.0
129.0
99.0
49.5
169.0
123.0
MCA
19.5
22.8
25.1
17.8
9.0
MOCP*
30
024
030
208/230-1-60 187 253
208/230-1-60 187 253
208/230-1-60 187 253
208/230-3-60 187 253
12
10
10
12
14
10
10
14
6
75
100
95
1.4
2.6
30
1.4
2.8
30
036
042
1.4
2.8
25
70
460-3-60
414 506
0.8
1.4
10
100
80
208/230-1-60 187 253
208/230-3-60 187 253
20.0
13.9
6.8
1.4
3.1
29.5
21.9
10.9
41.6
27.4
13.4
49.4
33.4
45
1.4
3.1
30
60
460-3-60
414 506
0.8
1.6
15
100
100
70
208/230-1-60 187 253
208/230-3-60 187 253
26.4
15.0
8.2
1.4
7.2
60
048
060
1.4
7.2
40
10
14
6
460-3-60
414 506
0.8
2.3
20
100
100
90
208/230-1-60 187 253
208/230-3-60 187 253
32.1
19.3
2.1
7.2
60
2.1
7.2
50
8
Example: Supply voltage is 460-3-60.
LEGEND
AB = 452 v
BC = 464 v
AC = 455 v
AWG
FLA
—
American Wire Gage
Full Load Amps
—
—
HACR
Heating, Air Conditioning and
Refrigeration
452 ϩ 464 ϩ 455
Average Voltage =
LRA
—
—
—
—
Locked Rotor Amps
3
MCA
MOCP
RLA
Minimum Circuit Amps
Maximum Overcurrent Protection
Rated Load Amps
1371
3
=
*Fuse or HACR Breaker.
† Carrier Scroll Compressor.
**Copeland Scroll Compressor.
= 457
Determine maximum deviation from average voltage.
(AB) 457 − 452 = 5 v
NOTES:
(BC) 464 − 457 = 7 v
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 As-
sociation) units may be fuse or circuit breaker.
(AC) 457 − 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
7
2. Minimum wire size is based on 60 C copper wire. If other than
60 C wire is used, or if length exceeds wire length in table, de-
termine size from NEC.
% Voltage Imbalance = 100 x
457
3. Unbalanced 3-Phase Supply Voltage
= 1.53%
Never operate a motor where a phase imbalance in supply volt-
age is greater than 2%. Use the following formula to determine
the percentage of voltage imbalance.
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.
% Voltage imbalance
max voltage deviation from average voltage
= 100 x
average voltage
20
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NOTE: Do not use any type of power-stealing thermostat.
Unit control problems may result.
Use no. 18 American Wire Gage (AWG) color-coded, in-
sulated (35 C minimum) wires to make the control voltage
connections between the thermostat and the unit. If the ther-
mostat is located more than 100 ft from the unit (as mea-
sured along the control voltage wires), use no. 16 AWG color-
coded, 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 knock-
out 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 low-
voltage connection leads can be identified by the colors red,
green, yellow, brown, and white. (See Fig. 21.) Ensure the
leads are long enough to 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.
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 field-
supplied splice.
Alternate Connection — Remove knockout in compressor fixed
panel located below high-voltage knockout. Remove the rub-
ber grommet from the installer’s packet (included with unit)
and install grommet in the knockout opening. Route ther-
mostat 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 low-
voltage section of junction box.
4. Connect power wires to unit high-voltage leads.
5. On 3-phase units, locate blue wire projecting from com-
pressor 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.
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 high-
voltage knockout. Remove the rubber grommet from the in-
staller’s packet (included with unit) and install grommet in
the knockout opening. Route thermostat wires through grom-
met 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 rub-
ber 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 the unit low-voltage splice box.
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.
Connecting to Easy Select Interface Board — The Easy Se-
lect 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 as-
sembly 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 ther-
mostat. Secure all cut wires in the control and splice boxes
so they do not interfere with the proper operation of the unit.
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 ter-
minal cannot be seen.
CONTROL VOLTAGE CONNECTIONS; NON-
INTEGRATED 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 or heating source or direct exposure to sunlight. Mount
the thermostat 4 to 5 ft above the floor.
21
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PRE-START-UP
Failure to observe the following warnings could result
in serious personal injury:
1. Follow recognized safety practices and wear protec-
tive goggles when checking or servicing refrigerant
system.
2. Do not operate compressor or provide any electric
power to unit unless compressor terminal cover is in
place and secured.
3. Do not remove compressor terminal cover until all
electrical sources are disconnected.
4. Relieve and reclaim all refrigerant from system be-
fore touching or disturbing anything inside terminal
box if refrigerant leak is suspected around compres-
sor terminals.
5. Never attempt to repair soldered connection while re-
frigerant system is under pressure.
6. Do not use torch to remove any component. System
contains oil and refrigerant under pressure. To re-
move a component, wear protective goggles and pro-
ceed as follows:
LEGEND
IFO
JW
—
—
Indoor (Evaporator) Fan On
Jumper Wire
Fig. 22 — Easy Select Interface Board
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 connecting tubing with tubing cut-
ter and remove component from unit.
d. Carefully unsweat remaining tubing stubs when
necessary. Oil can ignite when exposed to torch
flame.
HEAT ANTICIPATOR SETTING — The room thermostat
heat anticipator must be properly adjusted to ensure proper
heating performance. Set the heat anticipator, using an am-
meter between the W and R terminals to determine the
exact required setting.
Proceed as follows to inspect and prepare the unit for ini-
tial start-up:
NOTE: For thermostat selection purposes, use 0.18 amp for
the approximate required setting.
1. Remove all access panels.
Failure to make a proper heat anticipator adjustment will
result in improper operation, discomfort to the occupants of
the conditioned space, and inefficient energy utilization; how-
ever, the required setting may be changed slightly to provide
a greater degree of comfort for a particular installation.
2. Read and follow instructions on all WARNING, CAU-
TION, and INFORMATION labels attached to, or shipped
with, unit.
3. Make the following inspections:
TRANSFORMER PROTECTION — The unit transformer
protection may be one of 2 types.
a. Inspect for shipping and handling damages such as bro-
ken lines, loose parts, disconnected wires, etc.
The first transformer type may contain an auto. reset over-
current 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-voltage electrical circuit, such as an electrical short,
ground, or transformer overload. Disconnect power, correct
the condition, and check for normal unit operation.
b. Inspect for oil at all refrigerant tubing connections and
on unit base. Detecting oil generally indicates a re-
frigerant leak. Leak-test all refrigerant tubing connec-
tions using electronic leak detector, 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.
The second transformer type is of the energy-limiting type.
It is set to withstand a 30-second overload or shorted
secondary condition.
4. Verify the following conditions:
Do not purge gas supply into the combustion cham-
ber. Do not use a match or other open flame to check
for gas leaks. Failure to follow this warning could
result in an explosion causing personal injury or death.
22
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a. Before lighting the unit for the first time, perform the
following: If the gas supply pipe was not purged be-
fore connecting the unit, it will be full of air. It is rec-
ommended 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 com-
bustion chamber. Immediately upon detection of gas
odor, retighten the union. Allow 5 minutes to elapse,
then light unit.
Start Up Heating Section and Make
Adjustments
Complete the required procedures given in Pre-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. Un-
stable 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.
b. Make sure that condenser-fan blade is correctly posi-
tioned in fan orifice. Leading edge of condenser-fan
blade should be 1⁄2 in. 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.
NOTE: Make sure that gas supply has been purged, and that
all gas piping has been checked for leaks.
e. Make sure that all tools and miscellaneous loose parts
have been removed.
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 the heating temperature control of the thermostat above
room temperature.
3. The induced-draft motor will start.
4. After a call for heating, 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 burn-
ers still do not light, this sequence is repeated. If the burn-
ers 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 will turn 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 pres-
sure after unit start-up. (See Table 5.) If adjustment is
required proceed as follows.
Fig. 23 — Fan Blade Clearance
START-UP
The rated gas inputs shown in Table 5 are for al-
titudes from sea level to 2000 ft above sea level. These in-
puts are based on natural gas with a heating value of
1050 Btu/ft3 at 0.65 specific gravity, or propane gas with
a heating value of 2500 Btu/ft3 at 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.
Check for Refrigerant Leaks — Proceed as follows
to locate and repair a refrigerant leak and to charge the unit:
1. Locate leak and make sure that refrigerant system pres-
sure has been relieved and reclaimed from both high- and
low-pressure ports.
2. Repair leak following accepted practices.
These units are designed to consume the rated gas in-
puts using the fixed orifices at specified manifold pres-
sures as shown in Table 5. DO NOT REDRILL THE
ORIFICES UNDER ANY CIRCUMSTANCES.
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.
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 mani-
fold pressure must be measured to determine the input of
propane gas units.
4. Evacuate and reclaim refrigerant from refrigerant system
if additional leaks are not found.
5. Charge unit with R-22 refrigerant, using a volumetric-
charging cylinder or accurate scale. Refer to unit rating
plate for required charge. Be sure to add extra refrigerant
to compensate for internal volume of filter drier.
23
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Table 5 — Rated Gas Inputs at Indicated Manifold Pressures
GAS SUPPLY PRESSURE
MANIFOLD
PRESSURE
(in. wg)
NATURAL GAS
PROPANE*
(in. wg)
NUMBER
OF
ORIFICES
UNIT 48SS,SX
Orifice Heating Orifice Heating
Natural
Min Max
Propane
Drill
Size
Input
(Btuh)†
Drill
Size
Input
(Btuh)†
Min
Max Natural Propane
018040, 024040, 030040
1
2
4.0
4.0
13.0
13.0
4.0
4.0
13.0
13.0
3.5
3.5
3.1
3.3
32
40
40,000
56,000
41
47
40,000
54,000
024060, 030060, 036060, 042060
030080, 036080, 042080,
048080, 060080
2
4.0
13.0
4.0
13.0
3.5
3.4
32
80,000
42
80,000
036100, 042100, 048100, 060100
036120, 042120, 048120, 060120
048140, 060140
2
3
3
4.0
4.0
4.0
13.0
13.0
13.0
4.0
4.0
4.0
13.0
13.0
13.0
3.5
3.5
3.5
3.7
3.5
3.4
30
32
31
95,000
120,000
136,000
40
42
40
95,000
115,000
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.
Measure Gas Flow (Natural Gas Units) — Minor adjust-
ment to the gas flow can be made by changing the man-
ifold pressure. The manifold pressure must be maintained
between 3.4 and 3.6 in. wg. If larger adjustments are re-
quired, change main burner orifices following the recom-
mendations 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 con-
nect 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
MANIFOLD
PIPE PLUG
is 1050 Btu/ft3. Proceed as follows:
1. 30 seconds to complete one revolution.
2. 3600 ÷ 30 = 120.
Fig. 24 — Burner Assembly
3. 120 x 1 = 120 ft3 of gas flow/hr.
4. 120 x 1050 = 126,000 Btuh input.
If the desired gas input is 120,000 Btuh, only a minor change
in the manifold pressure is required.
Unsafe operation of the unit may result if manifold
pressure is outside this range. Personal injury or unit
damage may result.
Observe manifold pressure and proceed as follows to ad-
just gas input:
1. Remove cover screw over regulator adjustment screw on
gas valve.
3. Replace cover screw cap on gas valve.
4. Turn off gas supply to unit. Remove manometer from pres-
sure tap and replace pipe plug on gas valve. Turn on gas
to unit and check for leaks.
2. Turn regulator adjustment screw clockwise to increase gas
input, or turn regulator adjustment screw counterclock-
wise to decrease input. Manifold pressure must be be-
tween 3.4 and 3.6 in. wg.
24
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Measure Manifold Pressure (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 con-
nect 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 mani-
fold pressure, as specified in Table 5. Turn adjusting
screw clockwise to increase manifold pressure, or turn
adjusting screw counterclockwise to decrease manifold
pressure.
Fig. 25 — Monoport Burners
6. Replace cover screw.
AIRFLOWAND TEMPERATURE RISE — The heating sec-
tion for each size unit is designed and approved for heating
operation within the temperature-rise range stamped on the
unit rating plate.
Table 6 shows the approved temperature-rise range for each
heating input, and the air delivery cfm at various tempera-
ture rises. The heating operation airflow must produce a tem-
perature rise that falls within the approved range.
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 — With burner access panel re-
moved, observe the unit heating operation. Watch the burner
flames to see if they are light blue and soft in appearance,
and that the flames are approximately the same for each burner.
Propane will have blue flame with yellow tips. See Fig. 25.
Refer to Maintenance section for information on burner
removal.
Refer to Evaporator Airflow and Airflow Adjustments sec-
tion 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)
TEMPERATURE RISE °F
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
40,000
56,000
80,000
95,000
120,000
136,000
1389
2083
2778
3472
4167
5037
1111
1667
2222
2778
3333
4029
926
1389
1852
2315
2778
3358
794
1190
1587
1984
2381
2878
694
1042
1389
1736
2083
2518
617
926
556
833
—
—
—
—
—
—
—
—
—
—
—
—
—
758
—
—
1235
1543
1852
2238
1111
1389
1667
2014
1010
1263
1515
1831
926
1157
1389
1679
855
1068
1282
1549
794
992
1190
1439
—
—
—
—
926
1111
1343
868
1042
1259
—
—
980
1185
926
1119
NOTE: Dashed areas do not fall within the approved temperature rise range of the unit.
25
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HEATING SEQUENCE OF OPERATION — See Fig. 26-33
and unit wiring label.
Start Up Cooling Section and Make
Adjustments
On a call for heating, terminal ‘‘W’’ of the thermostat is
energized, starting the induced-draft motor. When the hall-
effect 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-fan motor 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 lo-
cated by removing the burner access panel. During normal
operation, the LED is continuously on. See Table 7 for error
codes.
Complete the required procedures given in the Pre-
Start-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 tem-
perature is below 40 F (unless accessory low-ambient
kit is installed).
Do not rapid-cycle the compressor. Allow 5 minutes be-
tween ‘‘on’’ cycles to prevent compressor damage.
CHECKING COOLING CONTROL OPERATION — Start
and check the unit for proper cooling control operation as
follows:
1. Place room thermostat SYSTEM switch in OFF position.
Observe that blower motor starts when FAN switch is placed
in ON position and shuts down when FAN switch is placed
in AUTO. position.
2. Place SYSTEM switch in COOL position and FAN switch
in AUTO. position. Set cooling control below room tem-
perature. Observe that compressor, condenser fan, and evapo-
rator blower motors start. Observe that cooling
cycle shuts down when control setting is satisfied. 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 tem-
perature control is set to ‘‘call for heating’’ (above room
temperature) and operates in cooling mode when tem-
perature control is set to ‘‘call for cooling’’ (below room
temperature).
Table 7 — LED Indications
ERROR CODE
Normal Operation
LED INDICATION
On
Hardware Failure
Off
Fan On/Off Delay Modified
Limit Switch Fault
1 Flash
2 Flashes
3 Flashes
4 Flashes
5 Flashes
6 Flashes
7 Flashes
8 Flashes
Flame Sense Fault
Four Consecutive Limit Switch Faults
Ignition Lockout Fault
Induced-Draft Motor Fault
Rollout Switch Fault
Internal Control Fault
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 cir-
cuit. Should the leaving-air temperature rise above the maxi-
mum 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 un-
til 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 ig-
nition system cycles and the unit returns to normal heating
operation.
IMPORTANT: Three-phase, scroll compressor units
(48SS048,060 and 48SX036-060) are direction-oriented.
These units must be checked to ensure proper com-
pressor 3-phase power lead orientation. If not cor-
rected within 5 minutes, the internal protector will shut
off the compressor. The 3-phase power leads to the unit
must be reversed to correct rotation. When turning back-
wards, scroll compressors emit elevated noise levels,
and the difference between compressor suction and dis-
charge pressures may be dramatically lower than
normal.
AUXILIARY LIMIT SWITCH — ROLLOUT — The func-
tion of the switch is to close the main gas valve in the event
of flame rollout. The switch is located above the main burn-
ers. 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 burn-
ers. The indoor (evaporator) fan motor (IFM) and induced
draft motor continue to run until switch is reset.
(Text continued on page 35.)
26
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LEGEND
AWG
BR
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
American Wire Gage
PWR
QT
—
—
—
—
Power
Blower Relay
Quadruple Terminal
Rollout Switch
Transformer
C
Contactor
Capacitor
RS
CAP
CH
TRAN
Crankcase Heater
Compressor Motor
Combustion Relay
Equipment
Field Splice
COMP
CR
EQUIP
FL
Terminal (Marked)
Terminal (Unmarked)
Splice
Fuse Link
FS
FU
Flame Sensor
Fuse
GND
GVR
HS
Ground
Gas Valve Relay
Hall Effect Sensor
High-Voltage Transformer
Ignitor
HV TRAN
I
Splice (Marked)
IDM
IFM
IGC
IP
Induced-Draft Motor
Indoor-Fan Motor
Integrated Gas Control
Internal Protector
Limit Switch
Main Gas Valve
National Electrical Code
Outdoor-Fan Motor
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To Indicate Common Potential
Only, Not to Represent Wiring
LS
MGV
NEC
OFM
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
27
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LEGEND
AWG
BR
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
American Wire Gage
PWR
QT
—
—
—
—
Power
Blower Relay
Quadruple Terminal
Rollout Switch
Transformer
C
Contactor
Capacitor
RS
CAP
CH
TRAN
Crankcase Heater
Compressor Motor
Combustion Relay
Equipment
Field Splice
COMP
CR
EQUIP
FL
Terminal (Marked)
Terminal (Unmarked)
Splice
Fuse Link
FS
FU
Flame Sensor
Fuse
GND
GVR
HS
Ground
Gas Valve Relay
Hall Effect Sensor
High-Voltage Transformer
Ignitor
HV TRAN
I
Splice (Marked)
IDM
IFM
IGC
IP
Induced-Draft Motor
Indoor-Fan Motor
Integrated Gas Control
Internal Protector
Limit Switch
Main Gas Valve
National Electrical Code
Outdoor-Fan Motor
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To Indicate Common Potential
Only, Not to Represent Wiring
LS
MGV
NEC
OFM
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
28
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LEGEND
AWG
BR
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
American Wire Gage
QT
—
—
—
Quadruple Terminal
Rollout Switch
Transformer
Blower Relay
RS
C
Contactor
Capacitor
Crankcase Heater
Compressor Motor
Combustion Relay
Equipment
Flame Sensor
Fuse
Ground
Gas Valve Relay
Hall Effect Sensor
High-Voltage Transformer
Ignitor
Induced-Draft Motor
Indoor-Fan Motor
Integrated Gas Control
Limit Switch
Main Gas Valve
National Electrical Code
Outdoor-Fan Motor
Power
TRAN
CAP
CH
Field Splice
COMP
CR
Terminal (Marked)
Terminal (Unmarked)
Splice
EQUIP
FS
FU
GND
GVR
HS
HV TRAN
I
Splice (Marked)
IDM
IFM
IGC
LS
MGV
NEC
OFM
PWR
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To Indicate Common Potential
Only, Not to Represent Wiring
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
29
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LEGEND
AWG
BR
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
American Wire Gage
PWR
QT
—
—
—
—
—
Power
Blower Relay
Quadruple Terminal
Rollout Switch
Start Thermistor
Transformer
C
Contactor
Capacitor
RS
CAP
COMP
CR
ST
TRAN
Compressor Motor
Combustion Relay
Discharge Thermostat
Equipment
Field Splice
DT
EQUIP
FL
Fuse Link
Terminal (Marked)
FS
FU
Flame Sensor
Fuse
Terminal (Unmarked)
GND
GVR
HS
Ground
Splice
Gas Valve Relay
Hall Effect Sensor
High-Voltage Transformer
Ignitor
Splice (Marked)
HV TRAN
I
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To Indicate Common Potential
Only, Not to Represent Wiring
IDM
IFM
IGC
LS
MGV
NEC
OFM
Induced-Draft Motor
Indoor-Fan Motor
Integrated Gas Control
Limit Switch
Main Gas Valve
National Electrical Code
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. 29 — 208/230-1-60 Wiring Diagram, Units 48SX024-042
30
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LEGEND
AWG
BR
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
American Wire Gage
PWR
QT
—
—
—
—
—
Power
Blower Relay
Quadruple Terminal
Rollout Switch
Secondary
C
Contactor
Capacitor
RS
CAP
COMP
CR
SEC
TRAN
Compressor Motor
Combustion Relay
Equipment
Transformer
Field Splice
EQUIP
FL
Fuse Link
FS
FU
Flame Sensor
Fuse
Terminal (Marked)
Terminal (Unmarked)
Splice
GND
GVR
HS
Ground
Gas Valve Relay
Hall Effect Sensor
High-Voltage Transformer
Ignitor
HV TRAN
I
Splice (Marked)
ICM
IDM
IGC
LS
MGV
NEC
OFM
Integrated Control Motor
Induced-Draft Motor
Integrated Gas Control
Limit Switch
Main Gas Valve
National Electrical Code
Outdoor-Fan Motor
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To Indicate Common Potential
Only, Not to Represent Wiring
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
31
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LEGEND
AWG
BR
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
American Wire Gage
QT
—
—
—
Quadruple Terminal
Rollout Switch
Transformer
Blower Relay
Contactor
RS
C
TRAN
CAP
COMP
CR
Capacitor
Field Splice
Compressor Motor
Combustion Relay
Equipment
EQUIP
FL
Terminal (Marked)
Terminal (Unmarked)
Splice
Fuse Link
FS
FU
Flame Sensor
Fuse
GND
GVR
HS
Ground
Gas Valve Relay
Hall Effect Sensor
High-Voltage Transformer
Ignitor
Splice (Marked)
HV TRAN
I
Factory Wiring
IDM
IFM
IGC
LS
MGV
NEC
OFM
PWR
Induced-Draft Motor
Indoor-Fan Motor
Integrated Gas Control
Limit Switch
Main Gas Valve
National Electrical Code
Outdoor-Fan Motor
Power
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To Indicate Common Potential
Only, Not to Represent Wiring
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
32
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LEGEND
AWG
BR
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
American Wire Gage
QT
—
—
—
—
Quadruple Terminal
Rollout Switch
Secondary
Blower Relay
RS
C
Contactor
Capacitor
SEC
TRAN
CAP
COMP
CR
Transformer
Compressor Motor
Combustion Relay
Equipment
Field Splice
EQUIP
FL
Fuse Link
Terminal (Marked)
Terminal (Unmarked)
Splice
FS
FU
Flame Sensor
Fuse
GND
GVR
HS
Ground
Gas Valve Relay
Hall Effect Sensor
High-Voltage Transformer
Ignitor
HV TRAN
I
Splice (Marked)
ICM
IDM
IGC
LS
MGV
NEC
OFM
PWR
Integrated Control Motor
Induced-Draft Motor
Integrated Gas Control
Limit Switch
Main Gas Valve
National Electrical Code
Outdoor-Fan Motor
Power
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To Indicate Common Potential
Only, Not to Represent Wiring
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
33
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LEGEND
AWG
BR
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
American Wire Gage
QT
—
—
—
Quadruple Terminal
Rollout Switch
Transformer
Blower Relay
RS
C
Contactor
Capacitor
TRAN
CAP
COMP
CR
Field Splice
Compressor Motor
Combustion Relay
Equipment
EQUIP
FS
Terminal (Marked)
Terminal (Unmarked)
Splice
Flame Sensor
Fuse
Ground
FU
GND
GVR
HS
Gas Valve Relay
Hall Effect Sensor
High-Voltage Transformer
Ignitor
Splice (Marked)
HV TRAN
I
Factory Wiring
IDM
IFM
IGC
LS
MGV
NEC
OFM
PWR
Induced-Draft Motor
Indoor-Fan Motor
Integrated Gas Control
Limit Switch
Main Gas Valve
National Electrical Code
Outdoor-Fan Motor
Power
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To Indicate Common Potential
Only, Not to Represent Wiring
NOTES:
1. If any of the original wire furnished must be replaced, it must be re-
placed with type 90 C wire or its equivalent.
2. Use copper conductors only.
Fig. 33 — 460-3-60 Wiring Diagram, Units 48SX036-048
34
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CHECKINGANDADJUSTING REFRIGERANT CHARGE
— The refrigerant system is fully charged with R-22 refrig-
erant, 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 access door. The label includes a ‘‘Superheat Charg-
ing 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 using the superheat charging method for evalu-
ating the unit charge. Do not use mercury or small dial-type
thermometers because they are not adequate for this type of
measurement.
For cooling operation, the recommended airflow is 350
to 450 cfm for each 12,000 Btuh of rated cooling ca-
pacity. For heating operation, the airflow must produce
a temperature rise that falls within the range stamped on
the unit rating plate.
Table 6 shows the temperature rise at various airflow rates.
Tables 11-14 show both heating and cooling airflows at vari-
ous 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 in-
stalled. See Table 17 for wet coil pressure drop.
NOTE: Be sure that all supply- and return-air grilles are open,
free from obstructions, and adjusted properly.
When evaluating the refrigerant charge, an indicated ad-
justment to the specified factory charge must always be
very minimal. If a substantial adjustment is indicated,
an abnormal condition exists somewhere in the cooling
system, such as insufficient airflow across either coil or
both coils.
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 fac-
tory 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.
Proceed as follows:
1. Remove caps from low- and high-pressure service
fittings.
2. Using hoses with valve core depressors, attach low- and
high-pressure gage hoses to low- and high-pressure serv-
ice fittings, respectively.
For 208/230-v and A.O. Smith 460-v Blower Motors — The
motor leads are color-coded as follows:
3-SPEED
2-SPEED
black = high speed
red = low speed
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).
black = high speed
blue = medium 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 to terminal BM for single-phase and 3-phase units.
To change the speed, remove and replace with lead for de-
sired blower motor speed. Insulate the removed lead to avoid
contact with chassis parts.
c. Suction-tube temperature (F) at low-side service
fitting.
d. Suction (low-side) pressure (psig).
5. Using ‘‘Superheat Charging Table,’’ compare outdoor-air
temperature (F db) with evaporator inlet-air temperature
(F wb) to determine desired system operating superheat
temperature. See Tables 8A-8H and 9A-9F.
For 460-v GE Motors — The motor leads are color coded as
follows:
3-SPEED
2-SPEED
6. Using ‘‘Required Suction-Tube (F) Temperature’’ table,
compare desired superheat temperature with suction (low-
side) operating pressure (psig) to determine proper suction-
tube temperature. See Table 10.
black = high
black = high
blue = jumper
red = low
blue = jumper
orange = medium
red
= low
7. Compare actual suction-tube temperature with proper
suction-tube temperature. Using a tolerance of ± 3° F, add
refrigerant if actual temperature is more than 3° F higher
than proper suction-tube temperature, or remove refrig-
erant if actual temperature is more than 3° F lower than
required suction-tube temperature.
To change the speed of the blower motor, remove fan mo-
tor 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 any chas-
sis parts.
NOTE: If the problem causing the inaccurate readings is a
refrigerant leak, refer to Check for Refrigerant Leaks sec-
tion on page 23.
35
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The selection options allow installer to adjust airflow to meet
such individual needs as noise and static compensation, etc.
For Integrated Control Motors (ICM) — To configure the 48SX
unit, move the 5 Easy Select board wires to the terminals
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.
MODE
LO - Adjust
HI - Adjust
FAN ONLY
−15%
COOLING
−10%
HEATING
−10%
15%
10%
10%
AC/HP TIME DELAY (GRY) — Four motor operation delay
options are provided to customize system operation. See
table below:
AUX HEAT RANGE (VIO) — The airflow for unit 48SX is
preset at the factory. The airflow selection must not be set at
a setting lower than the default. Refer to Table 15 for airflow
and gas heat input for terminals 1-4.
OPTION
TERMINAL
DESCRIPTION
Used when it is desirable
to allow system coils time
to heat up or cool down
prior to airflow. Enhances
system efficiency.
Preset factory default setting for
48SX. Used for servicing or
when other components are
used to perform a delay func-
tion (e.g., integrated gas
control).
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.
30-Sec On/60-Sec
Off Delay Profile
1
No Delay Option
2
TYPE (ORN) — The TYPE is a preset factory default se-
lection. The preset factory default setting is AC for the 48SX
units. Default setting should not be altered.
30-Sec Off Delay
45-Sec Off Delay
3
4
Enhances system efficiency.
Enhances system efficiency.
AC/HP CFM ADJUST (BLK) — The preset factory default
selection is MED. Selections HI and LO will adjust the air-
flow supplied for all operational modes (see following table).
Table 8A — Superheat Charging Table, 48SS018
EVAP AIR — CFM
600
Evap Air — Ewb (F)
TEMP (F)
AIR ENT
COND
54
17.3
13.8
10.2
8.2
6.1
*
*
*
*
*
*
56
18.5
14.9
11.4
8.8
6.2
*
*
*
*
*
58
19.6
16.1
12.5
9.5
6.5
*
*
*
*
*
*
60
20.8
17.3
13.7
10.2
6.6
5.0
*
*
*
*
*
62
24.2
20.7
17.1
13.6
10.0
8.1
6.2
*
64
27.7
24.1
20.6
17.0
13.5
11.4
9.4
7.3
5.3
*
66
68
70
72
74
76
65
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
28.5
25.7
22.9
20.1
17.3
15.2
13.2
11.1
9.1
29.3
27.3
25.2
23.1
21.1
19.0
17.0
14.9
12.9
10.8
8.8
29.3
27.3
25.2
23.9
22.6
20.5
18.5
17.2
15.9
13.8
11.8
29.3
27.3
25.2
24.1
24.1
22.0
20.0
19.5
18.9
16.8
14.8
29.3
27.3
25.2
25.4
25.6
23.5
21.5
21.7
21.9
19.8
17.8
29.3
27.3
25.2
26.1
27.1
25.0
23.0
24.0
24.9
22.8
20.8
70
75
80
85
90
95
100
105
110
115
*
*
*
6.7
*
*
*
LEGEND
Entering Wet Bulb
Superheat at Compressor (F)
*Do not attempt to charge system under these conditions — refrig-
erant slugging may occur.
Ewb
SPH
—
—
Table 8B — Superheat Charging Table, 48SS024
EVAP AIR — CFM
800
Evap Air — Ewb (F)
TEMP (F)
AIR ENT
COND
54
18.2
17.1
16.0
14.8
13.7
11.1
8.5
7.3
6.2
*
56
19.0
17.6
16.2
14.7
13.3
10.9
8.4
7.5
6.6
*
58
19.9
18.1
16.4
14.6
12.9
10.7
8.4
7.7
6.9
*
60
20.7
18.6
16.6
14.5
12.5
10.4
8.4
7.9
7.3
5.3
*
62
22.5
20.4
18.3
16.3
14.3
12.2
10.1
8.9
64
24.2
22.1
20.1
18.0
16.0
13.9
11.9
9.9
66
68
70
72
74
76
65
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
25.1
23.0
21.0
19.7
18.4
16.3
14.3
12.2
10.2
8.1
25.9
23.9
21.8
21.3
20.7
18.7
16.6
14.6
12.5
10.5
8.4
26.6
24.9
23.3
22.4
21.5
19.9
18.2
16.6
14.9
13.3
11.6
27.2
26.0
24.8
23.5
22.3
21.0
19.8
18.6
17.3
16.1
14.9
27.9
27.1
26.2
24.6
23.1
22.2
21.4
20.6
19.7
18.9
18.1
28.6
28.1
27.7
25.8
23.8
23.4
23.0
22.6
22.1
21.7
21.3
70
75
80
85
90
95
100
105
110
115
7.6
5.5
*
7.8
5.8
*
*
*
*
6.1
LEGEND
Entering Wet Bulb
Superheat at Compressor (F)
*Do not attempt to charge system under these conditions — refrig-
erant slugging may occur.
Ewb
SPH
—
—
36
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Table 8C — Superheat Charging Table, 48SS030
EVAP AIR — CFM
1000
Evap Air — Ewb (F)
TEMP (F)
AIR ENT
COND
54
14.2
13.6
13.0
10.9
8.9
8.3
7.8
7.3
6.7
*
56
15.1
14.1
13.0
11.0
8.9
8.4
7.8
7.3
6.7
*
58
16.1
14.6
13.0
11.0
8.9
8.4
7.8
7.3
6.7
*
60
17.1
15.0
13.0
10.9
8.9
8.3
7.8
7.3
6.7
*
62
19.2
17.1
15.1
13.6
12.0
10.9
9.9
9.3
8.8
6.7
*
64
66
68
70
72
74
76
65
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
21.3
19.2
17.2
16.1
15.1
13.6
12.0
11.4
10.9
8.9
23.3
21.3
19.2
18.7
18.2
16.2
14.1
13.6
13.0
10.9
8.9
24.7
22.8
20.9
20.1
19.2
17.7
16.1
15.6
15.0
13.0
10.9
25.9
24.2
22.6
21.4
20.2
19.2
18.2
17.6
17.1
15.0
13.0
27.2
25.7
24.2
22.7
21.2
20.8
20.2
19.7
19.1
17.1
15.0
27.8
26.3
24.8
23.6
22.4
21.6
20.9
20.2
19.4
18.0
16.5
28.5
26.9
25.4
24.4
23.5
22.5
21.7
20.7
19.8
18.9
18.0
70
75
80
85
90
95
100
105
110
115
*
*
*
*
6.8
LEGEND
Entering Wet Bulb
Superheat at Compressor (F)
*Do not attempt to charge system under these conditions — refrig-
erant slugging may occur.
Ewb
SPH
—
—
Table 8D — Superheat Charging Table, 48SS036
EVAP AIR — CFM
1200
Evap Air — Ewb (F)
TEMP (F)
AIR ENT
COND
54
8.4
5.0
*
*
*
*
*
*
56
8.4
5.0
*
*
*
*
*
*
58
8.4
5.0
*
*
*
*
*
*
60
8.4
5.0
*
*
*
*
*
*
62
12.5
9.0
5.4
*
*
*
*
*
64
16.7
13.1
9.6
6.0
*
*
66
18.7
15.9
13.1
10.3
7.5
5.4
*
68
20.7
18.6
16.6
14.5
12.5
10.4
8.4
6.4
*
70
72
74
76
65
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
22.0
20.0
17.9
15.9
13.9
12.5
11.3
10.0
8.7
23.4
21.3
19.3
17.3
15.2
14.6
14.1
13.5
13.0
12.4
11.9
24.8
22.7
20.6
18.6
16.5
16.8
17.0
17.1
17.3
15.6
13.8
26.1
24.0
22.0
20.0
17.9
18.8
19.8
20.7
21.7
18.7
15.8
70
75
80
85
90
95
*
100
105
110
115
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
9.3
10.0
*
*
LEGEND
Entering Wet Bulb
Superheat at Compressor (F)
*Do not attempt to charge system under these conditions — refrig-
erant slugging may occur.
Ewb
SPH
—
—
Table 8E — Superheat Charging Table, 48SS042
EVAP AIR — CFM
1400
Evap Air — Ewb (F)
TEMP (F)
AIR ENT
COND
54
11.0
7.5
*
*
*
*
*
*
56
11.0
7.5
*
*
*
*
*
*
58
11.0
7.5
*
*
*
*
*
*
60
14.0
10.4
6.9
5.9
5.0
*
*
*
*
*
62
17.0
13.4
9.9
8.4
6.9
6.0
*
*
*
*
*
64
20.0
16.4
12.9
10.8
8.8
6.8
5.0
*
66
22.0
18.9
15.9
13.8
11.8
10.2
8.7
6.5
*
68
70
72
74
76
65
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
24.0
21.4
18.9
16.8
14.8
13.7
12.7
10.5
8.4
26.0
24.0
21.9
19.8
17.8
17.3
16.7
14.6
12.6
12.0
11.5
26.0
25.0
23.2
21.3
19.5
18.6
17.8
16.4
15.1
14.2
13.4
27.7
26.1
24.4
22.8
21.1
20.0
18.9
18.2
17.6
16.4
15.3
28.6
27.1
25.7
24.9
22.8
21.4
20.0
20.0
20.0
18.6
17.2
70
75
80
85
90
95
100
105
110
115
*
*
*
*
*
*
*
*
*
*
*
*
8.0
7.7
*
*
*
LEGEND
Entering Wet Bulb
Superheat at Compressor (F)
*Do not attempt to charge system under these conditions — refrig-
erant slugging may occur.
Ewb
SPH
—
—
37
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Table 8F — Superheat Charging Table, 48SS048 (Carrier Scroll Compressor)
EVAP AIR — CFM
1600
Evap Air — Ewb (F)
TEMP (F)
AIR ENT
COND
54
15.5
11.7
8.0
6.0
*
*
*
*
56
15.5
11.8
8.0
6.0
*
*
*
*
58
15.6
11.8
8.0
6.0
*
*
*
*
60
15.6
11.8
8.0
6.0
*
*
*
*
62
17.6
13.9
10.2
8.7
7.2
5.6
*
*
*
*
*
64
19.6
16.0
12.3
11.3
10.3
7.7
5.2
*
66
21.6
18.0
14.5
13.9
13.4
9.9
68
22.8
20.1
17.4
16.3
15.1
12.4
9.8
9.1
8.4
8.8
9.1
70
72
74
76
65
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
24.0
22.2
20.4
18.6
16.8
15.0
13.2
12.5
11.7
11.4
11.1
25.2
24.3
23.3
20.9
18.5
17.6
16.7
15.8
14.9
14.0
13.1
25.2
24.3
23.3
21.5
19.7
18.7
17.7
17.1
16.5
15.9
15.3
25.3
24.3
23.3
22.0
20.8
19.8
18.8
18.4
18.1
17.8
17.5
70
75
80
85
90
95
6.3
5.8
100
105
110
115
*
*
*
*
*
*
*
*
*
*
*
*
*
5.2
*
6.2
*
7.1
LEGEND
Entering Wet Bulb
Superheat at Compressor (F)
*Do not attempt to charge system under these conditions — refrig-
erant slugging may occur.
Ewb
SPH
—
—
Table 8G — Superheat Charging Table, 48SS048 (Copeland Scroll Compressor)
EVAP AIR — CFM
1600
Evap Air — Ewb (F)
TEMP (F)
AIR ENT
COND
54
19.0
15.4
11.9
8.4
5.0
*
*
*
*
*
56
19.0
15.4
11.9
8.4
5.0
*
*
*
*
*
58
19.0
15.4
11.9
8.4
5.0
*
*
*
*
*
60
19.0
15.4
11.9
8.4
5.0
*
*
*
*
*
62
21.7
18.1
14.6
11.0
7.5
*
*
*
*
*
*
64
24.3
20.8
17.2
13.7
10.1
6.6
*
66
26.0
22.5
18.9
15.4
11.8
9.0
6.2
*
68
27.7
24.1
20.6
17.0
13.5
11.4
9.4
7.3
5.3
*
70
72
74
76
65
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
27.9
25.1
22.3
19.5
16.7
14.7
12.6
10.6
8.5
28.2
26.1
24.0
22.0
20.0
17.9
15.9
13.8
11.8
11.2
10.6
28.4
27.1
25.8
24.5
23.2
21.1
19.1
17.0
15.0
15.5
16.0
28.6
28.1
27.5
27.0
26.4
24.4
22.3
20.3
18.2
19.8
21.3
70
75
80
85
90
95
100
105
110
115
*
*
*
*
*
6.9
5.3
*
*
*
*
*
*
*
LEGEND
Entering Wet Bulb
Superheat at Compressor (F)
*Do not attempt to charge system under these conditions — refrig-
erant slugging may occur.
Ewb
SPH
—
—
Table 8H — Superheat Charging Table, 48SS060
EVAP AIR — CFM
1995
Evap Air — Ewb (F)
TEMP (F)
AIR ENT
COND
54
20.1
16.5
13.0
10.9
8.9
6.9
5.0
*
56
20.1
16.5
13.0
10.9
8.9
6.9
5.0
*
58
20.1
16.5
13.0
10.9
8.9
6.9
5.0
*
60
20.1
16.5
13.0
10.9
8.9
6.9
5.0
*
62
20.1
17.3
14.5
12.4
10.4
8.4
6.3
*
64
20.1
18.0
16.0
13.9
11.9
9.9
7.8
5.8
*
66
22.6
20.6
18.5
16.5
14.4
12.4
10.3
8.3
68
70
72
74
76
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
25.2
23.1
21.1
19.0
17.0
14.9
12.9
10.8
8.8
25.6
24.0
22.3
20.6
18.9
17.3
15.6
13.9
12.3
10.6
8.9
26.1
24.8
23.5
22.2
20.9
19.6
18.3
17.0
15.7
14.4
13.1
26.6
25.6
24.7
23.8
22.9
22.0
21.1
20.1
19.2
18.3
17.4
27.0
26.5
25.9
25.4
24.9
24.3
23.8
23.2
22.7
22.2
21.6
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
6.2
*
*
*
*
6.7
*
LEGEND
Entering Wet Bulb
Superheat at Compressor (F)
*Do not attempt to charge system under these conditions — refrig-
erant slugging may occur.
Ewb
SPH
—
—
38
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Table 9A — Superheat Charging Table, 48SX024
EVAP AIR — CFM
800
Evap Air — Ewb (F)
TEMP (F)
AIR ENT
COND
54
22.1
18.5
15.0
9.2
*
*
*
*
56
22.1
18.9
15.4
9.5
*
*
*
*
58
22.8
19.3
15.7
9.7
*
*
*
*
60
23.2
19.6
16.1
9.9
*
*
*
*
62
25.3
22.2
19.2
14.4
9.6
7.2
*
*
*
*
*
64
27.4
24.8
22.3
18.9
15.5
12.5
9.4
7.1
*
66
29.5
27.5
25.4
23.3
21.3
17.8
14.2
10.6
7.1
68
70
72
74
76
65
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
29.8
28.3
26.7
24.7
22.6
20.1
17.5
14.5
11.4
8.4
30.2
29.1
28.1
26.0
24.0
22.4
20.9
18.3
15.8
13.2
10.7
30.5
30.0
29.4
27.3
25.3
24.8
24.2
22.1
20.1
18.0
16.0
31.3
30.0
28.7
27.4
26.1
25.1
24.2
22.9
21.6
19.5
17.5
32.1
30.0
28.0
27.4
26.8
25.5
24.2
23.6
23.1
21.0
19.0
70
75
80
85
90
95
100
105
110
115
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
5.3
LEGEND
Entering Wet Bulb
Superheat at Compressor (F)
*Do not attempt to charge system under these conditions — refrig-
erant slugging may occur.
Ewb
SPH
—
—
Table 9B — Superheat Charging Table, 48SX030
EVAP AIR — CFM
1000
Evap Air — Ewb (F)
TEMP (F)
AIR ENT
COND
54
11.2
7.6
*
*
*
*
*
*
56
11.2
7.7
*
*
*
*
*
*
58
11.2
7.7
*
*
*
*
*
*
60
11.2
7.7
*
*
*
*
*
*
62
14.9
12.1
9.4
8.5
7.6
*
*
*
*
*
64
18.6
16.6
14.7
13.5
12.3
10.0
7.7
*
66
22.3
21.1
20.0
18.5
17.0
14.2
11.5
5.7
*
68
22.4
21.6
20.7
19.3
18.0
16.0
14.1
9.9
70
72
74
76
65
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
22.5
22.0
21.4
20.2
18.9
17.8
16.7
14.0
11.4
8.9
22.7
22.4
22.1
21.0
19.9
19.6
19.2
18.2
17.1
13.5
10.0
22.9
22.5
22.1
21.6
21.1
20.7
20.2
19.4
18.6
15.8
13.0
23.1
22.5
22.0
22.1
22.3
21.8
21.2
20.6
20.1
18.0
16.0
70
75
80
85
90
95
100
105
110
115
*
*
*
*
*
*
*
*
*
*
*
*
*
5.7
*
*
*
*
*
*
*
*
LEGEND
Entering Wet Bulb
Superheat at Compressor (F)
*Do not attempt to charge system under these conditions — refrig-
erant slugging may occur.
Ewb
SPH
—
—
Table 9C — Superheat Charging Table, 48SX036
EVAP AIR — CFM
1200
Evap Air — Ewb (F)
TEMP (F)
AIR ENT
COND
54
21.3
19.3
17.2
13.6
10.1
6.5
*
*
*
*
*
56
21.3
19.3
17.2
13.6
10.1
6.5
*
*
*
*
*
58
21.3
19.3
17.2
13.6
10.1
6.5
*
*
*
*
*
60
21.3
19.3
17.2
13.6
10.1
6.5
*
*
*
*
*
62
22.0
20.2
18.5
15.1
11.7
8.8
6.0
*
64
22.6
21.2
19.7
16.6
13.4
11.2
9.0
*
66
23.3
22.2
21.0
18.0
15.0
13.5
12.0
6.0
*
68
23.5
22.3
21.1
18.5
15.8
14.6
13.4
8.7
*
70
23.7
22.5
21.3
18.9
16.5
15.7
14.8
11.4
8.0
72
74
76
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
23.8
22.6
21.4
19.3
17.3
16.8
16.2
14.1
12.1
10.0
8.0
23.3
22.0
20.7
19.4
18.1
17.2
16.2
14.9
13.6
11.5
9.5
22.8
21.5
20.1
19.5
19.0
17.6
16.2
15.6
15.1
13.0
11.0
*
*
*
*
*
*
*
*
*
*
*
*
LEGEND
Entering Wet Bulb
Superheat at Compressor (F)
*Do not attempt to charge system under these conditions — refrig-
erant slugging may occur.
Ewb
SPH
—
—
39
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Table 9D — Superheat Charging Table, 48SX042
EVAP AIR — CFM
1400
Evap Air — Ewb (F)
TEMP (F)
AIR ENT
COND
54
23.9
21.9
19.8
16.3
12.7
9.2
5.6
*
56
23.9
21.9
19.8
16.3
12.7
9.2
5.6
*
58
23.9
21.9
19.8
16.3
12.7
9.2
5.6
*
60
23.9
21.9
19.8
16.3
12.7
9.2
5.6
*
62
24.4
22.4
20.3
17.9
15.6
12.0
8.5
*
64
24.9
22.9
20.8
19.6
18.4
14.9
11.3
8.0
*
66
25.5
23.4
21.3
21.3
21.3
17.8
14.2
10.6
7.1
68
70
72
74
76
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
25.8
23.7
21.7
21.5
21.3
18.7
16.2
13.1
10.1
7.0
26.1
24.1
22.0
21.7
21.3
19.7
18.2
15.6
13.1
10.5
8.0
26.5
24.5
22.4
21.8
21.3
20.8
20.2
18.1
16.1
14.0
12.0
25.6
24.0
22.4
21.8
21.3
20.8
20.2
18.9
17.6
15.5
13.5
24.7
23.5
22.4
21.8
21.3
20.8
20.2
19.6
19.1
17.0
15.0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
LEGEND
Entering Wet Bulb
Superheat at Compressor (F)
*Do not attempt to charge system under these conditions — refrig-
erant slugging may occur.
Ewb
SPH
—
—
Table 9E — Superheat Charging Table, 48SX048
EVAP AIR — CFM
1600
Evap Air — Ewb (F)
TEMP (F)
AIR ENT
COND
54
27.2
25.0
22.8
20.6
18.3
13.3
8.2
*
56
27.2
25.0
22.8
20.6
18.3
13.3
8.2
*
58
27.2
25.0
22.8
20.6
18.3
13.3
8.2
*
60
27.2
25.0
22.8
20.6
18.3
13.3
8.2
*
62
27.0
24.8
22.7
20.5
18.3
14.2
10.2
6.3
*
64
26.7
24.6
22.5
20.4
18.3
15.2
12.2
8.4
*
66
26.5
24.5
22.4
20.3
18.3
16.3
14.2
10.6
7.1
68
70
72
74
76
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
26.0
24.5
22.9
21.4
19.8
17.8
15.7
12.9
10.1
7.1
25.6
24.5
23.5
22.4
21.4
19.3
17.3
15.2
13.1
10.5
8.0
25.1
24.6
24.0
23.5
22.9
20.9
18.8
17.5
16.1
14.0
12.0
24.5
23.8
23.1
22.4
21.8
20.4
19.0
18.1
17.1
15.3
13.5
24.0
23.1
22.2
21.4
20.6
19.9
19.2
18.7
18.2
16.6
15.0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
LEGEND
Entering Wet Bulb
Superheat at Compressor (F)
*Do not attempt to charge system under these conditions — refrig-
erant slugging may occur.
Ewb
SPH
—
—
Table 9F — Superheat Charging Table, 48SX060
EVAP AIR — CFM
1995
Evap Air — Ewb (F)
TEMP (F)
AIR ENT
COND
54
20.1
16.5
13.0
10.9
8.9
6.9
5.0
*
56
20.1
16.5
13.0
10.9
8.9
6.9
5.0
*
58
20.1
16.5
13.0
10.9
8.9
6.9
5.0
*
60
20.1
16.5
13.0
10.9
8.9
6.9
5.0
*
62
20.1
17.3
14.5
12.4
10.4
8.4
6.3
*
64
20.1
18.0
16.0
13.9
11.9
9.9
7.8
5.8
*
66
22.6
20.6
18.5
16.5
14.4
12.4
10.3
8.3
68
70
72
74
76
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
25.2
23.1
21.1
19.0
17.0
14.9
12.9
10.8
8.8
25.6
24.0
22.3
20.6
18.9
17.3
15.6
13.9
12.3
10.6
8.9
26.1
24.8
23.5
22.2
20.9
19.6
18.3
17.0
15.7
14.4
13.1
26.6
25.6
24.7
23.8
22.9
22.0
21.1
20.1
19.2
18.3
17.4
27.0
26.5
25.9
25.4
24.9
24.3
23.8
23.2
22.7
22.2
21.6
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
6.2
*
*
*
*
6.7
*
LEGEND
Entering Wet Bulb
Superheat at Compressor (F)
*Do not attempt to charge system under these conditions — refrig-
erant slugging may occur.
Ewb
SPH
—
—
40
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Table 10 — Required Suction-Tube Temperature (F)*
SUCTION PRESSURE AT SERVICE PORT (psig)
SUPERHEAT
TEMP (F)
61.5
35
37
39
41
43
45
47
49
51
53
55
57
59
61
63
65
67
69
71
73
75
64.2
37
39
41
43
45
47
49
51
53
55
57
59
61
63
65
67
69
71
73
75
77
67.1
39
41
43
45
47
49
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
70.0
41
43
45
47
49
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
81
73.0
43
45
47
49
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
81
83
76.0
45
47
49
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
81
83
85
79.2
47
49
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
81
83
85
87
82.4
49
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
81
83
85
87
89
85.7
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
81
83
85
87
89
91
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
*Temperature at suction service valve.
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)
EXTERNAL STATIC PRESSURE (in. wg)
UNIT
48SS
MOTOR
SPEED
AIR
DELIVERY
0.0
230
760
†
0.1
225
745
†
0.2
220
725
†
0.3
210
0.4
195
0.5
170
0.6
†
0.7
†
0.8
†
0.9
†
1.0
†
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Low
High
Low
Med
High
Low
Med
High
Low
High
Low
High
Low
Med
High
695
640
540
†
†
†
†
†
018
†
†
269
782
349
996
460
1282
418
1130
459
1234
593
1461
580
1430
750
1685
786
1905
905
2025
1029
1803
1197
2097
1343
2231
270
850
260
745
345
978
443
1223
395
1047
439
1162
564
1370
550
1375
700
1610
744
1830
846
1905
986
235
700
257
717
326
919
425
1156
367
946
410
1074
541
1292
520
1280
680
1525
706
1752
824
1830
938
200
450
249
663
319
865
401
1068
346
865
377
920
506
1157
493
1225
649
1485
641
1603
804
1752
891
1641
1053
1882
1191
1975
†
†
†
†
†
†
†
†
†
†
†
†
†
275
857
371
1079
514
1409
473
1253
519
1414
667
1734
678
1540
†
275
835
368
1063
493
1383
447
1253
500
1366
634
1639
635
1515
820
1825
†
273
802
360
1027
476
1324
427
1172
478
1287
609
1563
604
1475
785
1750
854
2026
†
†
†
†
†
†
†
304
783
378
984
337
829
357
829
469
960
455
1128
612
1355
606
1513
748
1603
830
1533
994
1781
1129
1859
293
726
344
857
323
768
340
743
436
829
430
1020
570
1215
557
1367
683
1398
769
1425
936
1679
1067
1746
†
†
†
†
†
†
†
†
422
743
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†
024,
030
036
042
048
†
†
†
†
†
511
1228
637
1228
733
1345
871
1542
1002
1591
†
†
†
†
†
†
1104
1876
1351
2249
†
1093
1865
1295
2209
†
1072
1840
1245
2157
1391
2299
697
1264
812
1405
936
1441
1765
1148
2036
1296
2152
1710
1096
1959
1247
2060
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.
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.
†Unit air delivery is outside of operating range.
41
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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)
EXTERNAL STATIC PRESSURE (in. wg)
UNIT
48SS
MOTOR
SPEED
AIR
DELIVERY
0.0
†
†
401
1334
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†
†
0.1
295
821
376
1253
285
798
378
1011
520
1342
460
1191
511
1316
655
1541
637
1500
790
1750
847
1995
†
†
983
0.2
251
817
346
1128
284
761
371
982
511
1309
439
1136
492
1244
631
1458
612
1450
750
1675
784
1901
909
2018
950
0.3
223
753
322
996
282
727
368
948
0.4
201
665
294
816
278
682
362
906
0.5
176
536
272
658
274
634
357
858
0.6
149
343
250
461
270
581
343
771
0.7
124
164
229
246
261
525
332
703
411
0.8
†
0.9
†
1.0
†
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watt
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Low
High
Low
Med
High
Low
Med
High
Low
High
Low
High
Low
Med
High
†
†
†
018
219
167
251
450
315
597
385
745
297
579
332
657
459
806
†
†
†
†
†
244
371
301
492
362
610
270
471
308
535
433
662
†
230
304
283
387
341
471
246
349
275
389
398
509
†
024,
030
487
472
451
431
1237
423
1081
470
1178
603
1367
587
1405
700
1604
746
1822
852
1896
923
1181
398
1005
450
1104
584
1292
560
1350
679
1509
708
1730
820
1814
885
1106
379
907
420
1005
552
1178
526
1290
639
1421
646
1580
801
1729
845
1628
964
1807
1092
1882
1007
349
795
392
891
522
1053
493
1200
608
1323
609
1477
751
1582
804
1553
921
1723
1053
1796
892
322
687
364
784
492
920
455
1105
574
1221
563
1319
687
1380
751
1446
872
1612
1001
1676
036
†
†
†
042
048
547
1094
516
1178
639
1270
697
1339
823
1501
950
1555
†
†
†
†
†
†
665
1257
783
1392
907
1437
†
†
†
†
†
†
633
1175
742
1282
864
1318
1838
1115
2067
1284
2167
1808
1083
2023
1201
2108
1755
1045
1957
1166
2038
1702
1006
1891
1131
1968
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.
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.
†Unit air delivery is outside of operating range.
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)
EXTERNAL STATIC PRESSURE (in. wg)
UNIT
48SX
MOTOR
SPEED
AIR
DELIVERY
0.0
280
820
365
1025
†
0.1
275
810
360
1010
†
0.2
265
755
350
975
490
1300
474
1290
535
1450
†
0.3
255
700
345
940
480
1255
458
1240
510
1400
†
0.4
250
660
340
900
470
1200
445
1200
480
1380
650
1560
450
1250
525
1430
†
0.5
245
600
330
850
460
1150
425
1140
460
1300
614
0.6
240
560
320
800
445
1080
†
0.7
†
†
310
720
430
1005
†
0.8
†
0.9
†
1.0
†
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Low
Med
High
Low
Med
High
Low
Med
High
Low
High
†
†
†
300
630
410
915
†
†
†
390
790
†
†
†
380
620
†
024,
030
†
†
520
1375
575
1520
†
495
1335
560
1490
†
†
†
†
†
†
440
1200
575
1380
410
1140
480
1300
670
1670
750
1640
870
1750
425
1080
540
1280
390
1070
450
1220
640
1600
680
1500
810
1635
†
†
†
036
†
†
†
510
1170
†
480
1060
†
†
†
†
†
†
†
†
1500
430
1200
505
1360
700
490
1400
590
1600
†
480
1380
580
1560
†
470
1340
560
1540
†
460
1300
545
1470
†
†
†
†
420
1120
600
1480
600
1330
740
1500
†
†
560
1340
†
†
665
1300
†
†
500
1100
†
†
†
†
042
Watts
Cfm
Watts
Cfm
Watts
Cfm
†
†
†
†
†
1780
810
1700
930
1050
1850
†
1000
1830
†
970
1800
†
930
1785
1050
2000
870
1750
1000
1940
048**
†
†
†
1850
*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.
**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.
†Unit air delivery is outside of operating range.
42
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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)
EXTERNAL STATIC PRESSURE (in. wg)
UNIT
48SX
MOTOR
SPEED
AIR
DELIVERY
0.0
280
820
365
1025
†
0.1
275
810
360
1010
†
0.2
265
755
350
975
490
1300
474
1290
535
1450
†
0.3
255
700
345
940
480
1255
458
1240
510
1400
†
0.4
250
660
340
900
470
1200
445
1200
480
1380
650
1560
450
1250
525
1430
†
0.5
245
600
330
850
460
1150
425
1140
460
1300
614
0.6
240
560
320
800
445
1080
†
0.7
†
†
310
720
430
1005
†
0.8
†
0.9
†
1.0
†
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Low
Med
High
Low
Med
High
Low
Med
High
Low
High
†
†
†
300
630
410
915
†
†
†
390
790
†
†
†
380
620
†
024,
030
†
†
520
1375
575
1520
†
495
1335
560
1490
†
†
†
†
†
†
440
1200
575
1380
410
1140
480
1300
670
1670
750
1640
870
1750
425
1080
540
1280
390
1070
450
1220
640
1600
680
1500
810
1635
†
†
†
036
†
†
†
510
1170
†
480
1060
†
†
†
†
†
†
†
†
1500
430
1200
505
1360
700
490
1400
590
1600
†
480
1380
580
1560
†
470
1340
560
1540
†
460
1300
545
1470
†
†
†
†
420
1120
600
1480
600
1330
740
1500
†
†
560
1340
†
†
665
1300
†
†
500
1100
†
†
†
†
042
Watts
Cfm
Watts
Cfm
Watts
Cfm
†
†
†
†
†
1780
810
1700
930
1050
1850
†
1000
1830
†
970
1800
†
930
1785
1050
2000
870
1750
1000
1940
048**
†
†
†
1850
**For 460 v units only.
*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.
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.
†Unit air delivery is outside of operating range.
Table 15 — Dry Coil Air Delivery* — Heating —
Horizontal and Downflow Discharge for Integrated
Control Motor Units at 230-V (Deduct 10% from Cfm
for 208-V Operation)
Table 16 — Dry-Coil Air Delivery* — Fan Only and
Cooling — Horizontal and Downflow Discharge for
Integrated Control Motor Units at 230-V (Deduct 10%
from Cfm for 208-V Operation)
UNIT 48SX
048
FAN ONLY (Cfm)
COOLING (Cfm)
1600
HEATING
INPUT
EASY SELECT BOARD TERMINALS (Cfm)
1400
1750
1
2
3
4
(Btuh)
060
2000
80,000
100,000
95,000
1300
—
1400
1400
—
1600
1600
1600
—
1750
1750
1750
1750
*Air delivery values are for dry coil at 230 v. Airflow is independent of
external static pressure within Ϯ5% of table values up to
0.8 in wg.
—
136,000
—
—
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.
*Air delivery values are for dry coil at 230 v. Airflow is independent of
external static pressure within Ϯ5% of table values up to
0.8 in wg.
NOTES:
1. Dashed areas do not fall within approved range.
2. The above values occur with theAC/HP CFMADJUST select jumper
set on MED.
3. Airflow can be adjusted ϩ10% or −10% by selecting HI or LO for
all modes except FAN ONLY.
43
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Table 17 — Wet Coil Pressure Drop
MAINTENANCE
To ensure continuing high performance, and to minimize
the possibility of premature equipment failure, periodic main-
tenance must be performed on this equipment. This combi-
nation heating/cooling unit should be inspected at least once
each year by a qualified service person. To troubleshoot heat-
ing or cooling of units, refer to tables at the back of the book.
AIRFLOW
(cfm)
PRESSURE DROP
UNIT SIZE
(in. wg)
0.069
0.082
0.102
0.116
0.039
0.058
0.075
0.088
0.088
0.095
0.123
0.068
0.088
0.108
0.123
0.048
0.069
0.088
0.102
0.068
0.075
0.088
0.082
0.095
0.108
0.123
600
700
018*
800
900
NOTE TO EQUIPMENT OWNER: Consult your local dealer
about the availability of a maintenance contract.
600
700
024
030
036
800
900
The ability to properly perform maintenance on this equip-
ment requires certain expertise, mechanical skills, tools,
and equipment. If you do not possess these, do not at-
tempt 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.
900
1000
1200
1000
1200
1400
1600
1000
1200
1400
1600
1400
1600
1800
1700
1900
2100
2300
042
048
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 serv-
ice 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.
060
3. Never place anything combustible either on, or in con-
tact with, the unit.
*Unit 48SS only.
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.
COOLING SEQUENCE OF OPERATION — With the 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 ther-
mostat 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).
Errors made when reconnecting wires may cause im-
proper and dangerous operation. Label all wires prior to
disconnection when servicing.
The minimum maintenance requirements for this equip-
ment are as follows:
NOTE: The blower relay coil (BR) is used on standard non-
ICM units, ICM units use evaporator (indoor) fan on (IFO)
connection.
The normally-open contacts of energized contactor (C) close
and complete the circuit through compressor motor (COMP)
to condenser (outdoor) fan motor (OFM). Both motors start
instantly.
On standard non-ICM units, the set of normally-open con-
tacts of energized relay BR close and complete the circuit
through evaporator blower (indoor) fan motor (IFM). On ICM
units, the IFO completes the circuit through evaporator blower
IFM. The blower motor starts instantly.
NOTE: Once the compressor has started and then has stopped,
it should not be started again until 5 minutes have elapsed.
1. Inspect air filter(s) each month. Clean or replace when
necessary.
2. Inspect indoor coil, drain pan, and condensate drain each
cooling season for cleanliness. Clean when necessary.
3. Inspect blower motor and wheel for cleanliness and check
lubrication each heating and cooling season. Clean and
lubricate (if required) when necessary. For first heating
season, inspect blower wheel bimonthly to determine proper
cleaning frequency.
4. Check electrical connections for tightness and controls
for proper operation each heating and cooling season. Serv-
ice when necessary.
5. Check and inspect heating section before each heating sea-
son. Clean and adjust when necessary.
The cooling cycle remains ‘‘on’’ until the room tempera-
ture 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 ter-
minals Y and G. These open circuits deenergize contactor
coil C and relay coil BR. The condenser and compressor mo-
tors 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.
6. Check flue hood screen and remove any obstructions if
necessary.
7. Check vent screen and clean if necessary.
44
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housing, and slide motor and motor mount out of
housing.
Air Filter
2. Lubricate motor as follows:
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.
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 (3⁄16 oz. or 16 to 25 drops) in
each oil port.
d. Allow time for oil to be absorbed by each bearing,
then wipe excess oil from motor housing.
Inspect air filter(s) at least once each month and replace
(throwaway-type) or clean (cleanable-type) at least twice dur-
ing each heating and cooling season or whenever the filter(s)
becomes clogged with dust and lint.
Unit Top Removal
e. Replace dust caps or plugs in oil ports.
NOTE: When performing maintenance or service proce-
dures that require removal of the unit top, be sure to perform
all of the routine maintenance procedures that require top
removal, including: inspection of the heat exchanger area,
coil inspection and cleaning, and condensate drain pan in-
spection and cleaning.
Only qualified service personnel should perform mainte-
nance and service procedures that require unit top removal.
Refer to the following top removal procedures:
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 blower wheel, be sure not to disturb balance weights
(clips) on blower wheel vanes.
c. Remove caked-on dirt from wheel and housing with a
brush. Remove lint and/or dirt accumulations from wheel
and housing with vacuum cleaner, using soft brush at-
tachment. Remove grease and oil with mild solvent.
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.
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.
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 pro-
cedures are completed. (Be sure to use original screws
that have rubber washers to seal out water when securing
top to internal divider panels.)
f. Reinstall blower access door.
4. Restore electrical power, then gas supply to unit. Start
unit and check for proper blower rotation and motor speeds
during heating and cooling cycles.
Flue Gas Passageways — To inspect the flue col-
Evaporator Blower and Motor
lector box and upper areas of the heat exchanger:
NOTE: Motors without oilers are prelubricated. Do not at-
tempt to lubricate these motors.
1. Remove the combustion blower wheel and motor assem-
bly according to directions in Combustion-Air Blower sec-
tion on page 46.
2. Remove the 3 screws holding the blower housing to the
flue collector box cover (see Fig. 34).
For longer life, operating economy, and continuing effi-
ciency, clean accumulated dirt and grease from the blower
wheel and motor annually.
3. Remove the 12 screws holding the flue collector box cover
(Fig. 34) to the heat exchanger assembly. Inspect the heat
exchangers.
Lubricate the motor every 5 years if the motor is used in-
termittently (thermostat FAN switch in AUTO. position), or
every 2 years if the motor is used continuously (thermostat
FAN switch in ON position).
4. Clean all surfaces as required using the wire brush.
Turn off the gas supply, then disconnect and tag elec-
trical 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.
FLUE COLLECTOR
BOX
INDUCED
DRAFT MOTOR
MOUNTING PLATE
To clean and lubricate the blower motor and wheel:
1. Remove and disassemble blower assembly as follows:
a. Remove blower access door.
BLOWER
HOUSING
b. On standard non-ICM units disconnect motor lead from
blower relay (BR). Disconnect yellow lead from ter-
minal L2 of the contactor.
c. On all units remove blower assembly from unit. Re-
move screws securing blower to gas partition and slide
assembly out. Be careful not to tear insulation in blower
compartment.
BURNER
RACK
d. Ensure proper reassembly by marking blower wheel
and motor in relation to blower housing before dis-
assembly.
MOUNTING
SCREW
e. Loosen setscrew(s) that secures wheel to motor shaft,
remove screws that secure motor mount brackets to
Fig. 34 — Blower Housing and Flue Collector Box
45
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5. To remove motor, remove 4 screws that hold blower hous-
ing to mounting plate. Remove the motor cooling fan by
removing one setscrew. Remove nuts that hold motor to
mounting plate.
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.
6. To reinstall, reverse the procedure outlined above.
To inspect blower wheel, remove draft hood assembly. Shine
a flashlight into opening to inspect wheel. If cleaning is re-
quired, remove motor and wheel as follows:
Limit Switch — Remove blower panel. Limit switch is
located on the gas partition.
1. Remove burner access panel. (See Fig. 35.)
2. Remove the 7 screws that attach 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.
Burner Ignition — Unit is equipped with a direct spark
ignition 100% lockout system. Ignition module is lo-
cated 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.
4. To remove blower, remove 2 setscrews. (See Fig. 36.)
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 gas train, do not hit or plug orifice spuds.
REMOVAL OF GAS TRAIN
1. Shut off manual gas valve.
2. Shut off power to unit.
BURNER
ACCESS
PANEL
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.
Fig. 35 — Burner Access Panel
BLOWER
HOUSING
2 SETSCREWS
(HIDDEN)
Fig. 36 — Removal of Motor and Blower Wheel
Fig. 37 — Burner Rack Removed
46
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Remove the control, blower, and compressor compart-
ment access panels to locate all the electrical controls and
wiring. Check all electrical connections for tightness. Tighten
all screw connections. If any smoky or burned connections
are noticed, disassemble the connection, clean all the parts,
restrip the wire end and reassemble the connection properly
and securely.
After inspecting the electrical controls and wiring, re-
place all the panels. Start the unit, and observe at least one
complete heating cycle and one complete cooling cycle to
ensure proper operation. If discrepancies are observed in ei-
ther or both operating cycles, or if a suspected malfunction
has occurred, check each electrical component with the proper
electrical instrumentation. Refer to the unit wiring label when
making these checkouts.
Condenser Coil, Evaporator Coil, and Conden-
sate Drain Pan — Inspect the condenser coil, evapo-
rator coil, and condensate drain pan at least once each year.
Proper inspection and cleaning requires the removal of the
unit top. See Unit Top Removal section on page 45.
The coils are easily cleaned when dry; therefore, inspect
and clean the coils either before or after each cooling sea-
son. Remove all obstructions, including weeds and shrubs,
that interfere with the airflow through the condenser coil.
Straighten bent fins with a fin comb. If coated with dirt or
lint, clean the coils with a vacuum cleaner, using the soft
brush attachment. Be careful not to bend the fins. If coated
with oil or grease, clean the coils with a mild detergent-and-
water solution. Rinse coils with clear water, using a garden
hose. Be careful not to splash water on motors, insulation,
wiring, or air filter(s). For best results, spray condenser coil
fins from inside to outside the unit. On units with an outer
and inner condenser coil, be sure to clean between the coils.
Be sure to flush all dirt and debris from the unit base.
Inspect the drain pan and condensate drain line when in-
specting the coils. Clean the drain pan and condensate drain
by removing all foreign matter from the pan. Flush the pan
and drain tube with clear water. Do not splash water on the
insulation, motor, wiring, or air filter(s). If the drain tube is
restricted, clear it with a ‘‘plumbers snake’’ or similar probe
device. Ensure that the auxiliary drain port above the drain
tube is also clear.
NOTE: Refer to the heating and/or cooling sequence of op-
eration in this publication as an aid in determining proper
control operation.
Refrigerant Circuit — Inspect all refrigerant tubing con-
nections and the unit base for oil accumulations annually.
Detecting oil generally indicates a refrigerant leak.
If oil is detected or if low cooling performance is sus-
pected, leak-test all refrigerant tubing using an electronic leak-
detector, halide torch, or liquid-soap solution. If a refriger-
ant leak is detected, refer to Check for Refrigerant Leaks
section on page 23.
If no refrigerant leaks are found and low cooling perfor-
mance is suspected, refer to Checking and Adjusting Refrig-
erant Charge section on page 35.
Condenser Fan
Gas Input — The gas input does not require checking
unless improper heating performance is suspected. If a prob-
lem exists, refer to Start-Up section on page 23.
Keep the condenser fan free from all obstructions to en-
sure proper cooling operation. Never place articles on
top of the unit. Damage to unit may result.
Evaporator Airflow — The heating and/or cooling air-
flow does not require checking unless improper perfor-
mance is suspected. If a problem exists, be sure that all supply-
and return-air grilles are open and free from obstructions,
and that the air filter is clean. When necessary, refer to Evapo-
rator Airflow and Airflow Adjustments section on page 35 to
check the system airflow.
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 lead-
1
ing edge is ⁄2 in. in front of fan orifice. See Fig. 23.
Metering Device — Acutrol™ Device — This me-
tering device is a fixed orifice and is located in the header to
the evaporator coil.
5. Ensure that setscrew engages the flat area on the motor
shaft when tightening.
6. Replace grille.
Liquid Line Strainer — 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.
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.
47
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TROUBLESHOOTING
Cooling
SYMPTOM
CAUSE
REMEDY
Compressor and
condenser fan will
not start.
Power failure
Fuse blown or circuit breaker tripped
Defective thermostat, contactor, transformer, Replace component.
or control relay
Call power company.
Replace fuse or reset circuit breaker.
Insufficient line voltage
Incorrect or faulty wiring
Thermostat setting too high
Faulty wiring or loose connections in
compressor circuit
Determine cause and correct.
Check wiring diagram and rewire correctly.
Lower thermostat setting below room temperature.
Check wiring and repair or replace.
Compressor will not
start but condenser
fan runs.
Compressor motor burned out, seized, or
internal overload open
Defective run/start capacitor, overload,
start relay
Determine cause. Replace compressor.
Determine cause and replace.
One leg of 3-phase power dead
Replace fuse or reset circuit breaker.
Determine cause.
Three-phase scroll
compressor (Units
48SS048,060 and
48SX036-060 only)
makes excessive
noise, and there
may be a low pres-
sure differential.
Scroll compressor is rotating in the
wrong direction
Correct the direction of rotation by reversing the
3-phase power leads to the unit. Shut down unit to
allow pressures to equalize.
Compressor cycles
(other than normally
satisfying
Refrigerant overcharge or undercharge
Recover refrigerant, evacuate system, and
recharge to capacities shown on nameplate.
Replace and determine cause.
Determine cause and correct.
Determine cause and correct.
Determine cause and replace.
Defective compressor
Insufficient line voltage
Blocked condenser
Defective run/start capacitor, overload
or start relay
thermostat).
Defective thermostat
Replace thermostat.
Faulty condenser-fan motor or capacitor
Restriction in refrigerant system
Dirty air filter
Unit undersized for load
Thermostat set too low
Low refrigerant charge
Leaking valves in compressor
Air in system
Replace.
Locate restriction and remove.
Replace filter.
Decrease load or increase unit size.
Reset thermostat.
Locate leak, repair, and recharge.
Replace compressor.
Recover refrigerant, evacuate system, and recharge.
Clean coil or remove restriction.
Replace filter.
Compressor
operates
continuously.
Condenser coil dirty or restricted
Dirty air filter
Dirty condenser coil
Excessive head
pressure.
Clean coil.
Refrigerant overcharged
Air in system
Recover excess refrigerant.
Recover refrigerant, evacuate system, and recharge.
Determine cause and correct.
Check for leaks, repair and recharge.
Replace compressor.
Remove restriction.
Check for source and eliminate.
Replace compressor.
Condenser air restricted or air short-cycling
Low refrigerant charge
Compressor valves leaking
Restriction in liquid tube
High heat load
Compressor valves leaking
Refrigerant overcharged
Dirty air filter
Head pressure too
low.
Excessive suction
pressure.
Recover excess refrigerant.
Replace filter.
Suction pressure
too low.
Low refrigerant charge
Metering device or low side restricted
Insufficient evaporator airflow
Check for leaks, repair and recharge.
Remove source of restriction.
Increase air quantity. Check filter — replace if
necessary.
Temperature too low in conditioned area
Outdoor ambient below 40 F
Field-installed filter-drier restricted
Reset thermostat.
Install low-ambient kit.
Replace.
48
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Cooling (cont)
CAUSE
SYMPTOM
REMEDY
Integrated control
motor
Blower wheel not secured to shaft
Insufficient voltage at motor
Properly tighten blower wheel to shaft.
Determine cause and correct.
(units 48SX048,060
208/230 v)
Power connectors not properly
seated
Connectors should snap easily; do not
force.
IFM does not run.
Integrated control
motor (units
Motor programmed with a delay
profile
Allow a few minutes for motor to shut off.
48SX048,060
1
With thermostat in OFF the voltage
on G,Y1,Y/Y2,W with respect to
If measured voltage is more than ⁄2, the
208/230 v)
IFM runs when it
should be off.
thermostat is incompatible with motor. If
1
1
common, should be ⁄2 of actual
voltage is less than ⁄2, the motor has failed.
low voltage supply
Integrated control
motor (units
Water dripping into motor
Verify proper drip loops in connector wires.
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
Burners will not ignite.
CAUSE
Water in gas line
REMEDY
Drain. Install drip leg.
No power to furnace
Check power supply fuses, wiring, or circuit breaker.
No 24-v power supply to control
circuit
Check transformer.
NOTE: Some transformers have internal overcurrent
protection that requires a cool-down period to reset.
Miswired or loose connections
Burned-out heat anticipator in
thermostat
Check all wiring and wirenut connections.
Replace thermostat.
Broken thermostat wire
Run continuity check. Replace wire if necessary.
Misaligned spark electrodes
Check flame ignition and sense electrode positioning.
Adjust as necessary.
No gas at main burners
1. Check gas line for air. Purge as necessary.
NOTE: After purging gas line of air, wait at least
5 minutes for any gas to dissipate before attempt-
ing to light unit.
2. Check gas valve.
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 nameplate.
Unit undersized for application
Restricted airflow
Replace with proper unit or add additional unit.
Clean or replace filter. Remove any restriction.
Blower speed too low
Use faster speed tap if available, or install alternate
motor.
Limit switch cycles main burners
Check rotation of blower, thermostat heat antic-
ipator settings, temperature rise of unit. Adjust as
necessary.
Poor flame characteristics.
Incomplete combustion results in:
Aldehyde odors, carbon monox-
ide, sooting flame, floating flame
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.
49
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LED Troubleshooting — Error Code
CAUSE
SYMPTOM
REMEDY
Hardware failure.
(LED OFF)
Loss of power to control module
(IGC).
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 trans-
former. If the overload trips, allow 10 minutes for au-
tomatic reset.
Limit switch fault.
(LED 2 flashes)
High temperature limit switch is
open.
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.
Flame sense fault.
(LED 3 flashes)
The IGC sensed flame that
should not be present.
Reset unit. If problem persists, replace control board.
4 consecutive limit switch
faults.
(LED 4 flashes)
Inadequate airflow to unit.
Check operation of indoor (evaporator) fan motor and
that supply-air temperature rise agrees with range on
unit nameplate information.
Ignition lockout.
(LED 5 flashes)
Unit unsuccessfully attempted
ignition for 15 minutes.
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.
Induced-draft motor fault.
(LED 6 flashes)
IGC does not sense that induced-
draft motor is operating.
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.
Rollout switch fault.
(LED 7 flashes)
Rollout switch has opened.
Rollout switch will automatically reset, but IGC will
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.
Internal control fault.
(LED 8 flashes)
Microprocessor has sensed an
error in the software or hardware.
If error code is not cleared by resetting unit power,
replace the IGC.
IMPORTANT: Refer to Heating troubleshooting chart for addi-
tional troubleshooting analysis.
If the IGC must be replaced, be sure to ground yourself to dis-
sipate any electrical charge that may be present before han-
dling new control board. The IGC is sensitive to static electricity
and may be damaged if the necessary precautions are not taken.
LEGEND
IGC
LED
—
—
Integrated Gas Unit Controller
Light-Emitting Diode
SERVICE TRAINING
Packaged Service Training programs are an excellent way to increase your knowledge of the equip-
ment discussed in this manual, including:
• Unit Familiarization
• Installation Overview
• Maintenance
• Operating Sequence
A large selection of product, theory, and skills programs are available, using popular video-based for-
mats 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.
CALL FOR FREE CATALOG 1-800-962-9212
[
] Packaged Service Training
[
] Classroom Service Training
Copyright 1998 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 PC 111 Catalog No. 534-721 Printed in U.S.A. Form 48SS,SX-12SI Pg 50 9-98 Replaces: 48SS,SX-11SI
Tab 1a 6a
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4
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START-UP CHECKLIST
(Remove and Store in Job File)
I. PRELIMINARY INFORMATION
MODEL NO.:
DATE:
SERIAL NO.:
TECHNICIAN:
II. PRE-START-UP (insert checkmark in box as each item is completed)
Ⅺ VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT
Ⅺ VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS
Ⅺ CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS
Ⅺ CHECK GAS PIPING FOR LEAKS
Ⅺ CHECK THAT INDOOR (EVAPORATOR) AIR FILTER IS CLEAN AND IN PLACE
Ⅺ VERIFY THAT UNIT INSTALLATION IS LEVEL
Ⅺ CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE AND SETSCREW
TIGHTNESS
III. START-UP
ELECTRICAL
SUPPLY VOLTAGE
L1-L2
L2-L3
L2
L3-L1
L3
COMPRESSOR AMPS L1
COMPRESSOR AMPS L1
L2
L3
INDOOR (EVAPORATOR) FAN AMPS
TEMPERATURES
OUTDOOR (CONDENSER) AIR TEMPERATURE
DB
WB
RETURN-AIR TEMPERATURE
COOLING SUPPLY AIR
DB
GAS HEAT SUPPLY AIR
PRESSURES
GAS INLET PRESSURE
GAS MANIFOLD PRESSURE
REFRIGERANT SUCTION
REFRIGERANT DISCHARGE
IN. WG
IN. WG
PSIG
PSIG
Ⅺ VERIFY REFRIGERANT CHARGE USING CHARGING TABLES
Ⅺ VERIFY THAT 3-PHASE SCROLL COMPRESSOR (48SS048,060 AND 48SX036-060 UNITS) ROTATING IN
CORRECT DIRECTION
Copyright 1998 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
4
PC 111
Catalog No. 534-721
Printed in U.S.A.
Form 48SS,SX-12SI
Pg CL-1
9-98
Replaces: 48SS,SX-11SI
Tab 1a 6a
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