48SX024-048
Table of contents
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Packaged Gas Heating/
Electric Cooling Units
Installation, Start-Up and
48SS018-060
48SX024-048
COMMERCIAL
UNITARY
SYSTEMS
Service Instructions
CONTENTS
SAFETY CONSIDERATIONS ...........................
General
RECEIVING AND INSTALLATION
Step 1 — Check Equipment
• IDENTIFY UNIT
• INSPECT SHIPMENT
Step 2 — Provide Unit Support.......................
• ROOF CURB
• SLAB MOUNT
• FLUSH MOUNT
Step 3 — Field Fabricate Ductwork ....
Step 4 ~ Provide Clearances...........................
Step 5 — Rig and Place Unit
• UNITS WITHOUT BASE RAIL
• UNITS WITH OPTIONAL BASE RAIL
Step 6 — Connect Condensate Drain ...
Step 7 — Install Flue Hood..............................
Step 8 — Install Gas Piping ............................
Step 9 - Install Duct Connections
• CONFIGURING UNITS FOR DOWNFLOW
Step 10 — Install Electrical Connections .
• HIGH-VOLTAGE CONNECTIONS
• SPECIAL PROCEDURES FOR 208-V
• CONTROL VOLTAGE CONNECTIONS
• HEAT ANTICIPATOR SETTING
• TRANSFORMER PROTECTION
PRE-START-UP
START-UP . .
MAINTENANCE
START-UP CHECKLIST
.............................................................
...................
.........................
..........................
................
(VERTICAL) DISCHARGE
OPERATION
...............................................
............................
.................................................
...................................
Page
. 1-9
.. 1
10-20
. , 10
10
10
10
10
13
13
13
16
18
. . 21
21-38
39-44
. CL-1
Fig. 1 — Typical 48SS Unit Shown
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguisher available for all brazing operations.
A WARNING
Improper installation, adjustment, alteration, service,
maintenance, or use can cause carbon monoxide poi
soning, fire, or an explosion which can result in
personal injury or unit damage. Consult a qualified
installer, service agency, or gas supplier for informa
tion or assistance. The qualified installer or agency must
use only factory-authorized kits or accessories when mod
ifying this product.
t
NOTE TO INSTALLER — Before the installation, READ
THESE INSTRUCTIONS CAREFULLY AND COM
PLETELY. Also, make sure the User’s Manual and
Replacement Guide are left with the unit after installation*
Before performing service or maintenance operations
on unit, turn off gas supply then unit main power switch.
Electrical shock could cause personal injury.
A WARNING
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical com
ponents. Only trained and qualified personnel should
install, repair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance func
tions of cleaning coils and filters. All other operations should
be performed by trained service personnel. When working
on air-conditioning equipment, observe precautions in the
literature, tags and labels attached to the unit, and other
safety precautions that may apply.
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 534-842 Printed in U S A Form 48SS,SX-2SI Pg 1 5-94 Replaces: 48SS,SX-1 SI
Tab la 6a
General — The 48SS,SX units (see Fig. 1) are fully self-
contained, combination gas heating/electric cooling units
designed for outdoor installation. See Fig. 2-9 for unit di
mensions. All unit sizes have discharge openings for both
horizontal and downflow configurations, and are factory
shipped with all 4 duct openings covered. Units may be in
stalled either on a rooftop or a ground-level cement slab.
See Fig. 10 for roof curb dimensions.
REQ’D CLEARANCES FOR SERVICING In. (mm)
Duct panel
Unit top
Side opposite ducts
Compressor access
(Except for NEC requirements)
REQ’D CLEARANCES TO COMBUSTIBLE MAIL in (mm)
Maximum extension of overhangs ... 48 (1219)
Unit top . 14 (356)
Duct side of unit 0
Side opposite ducts 9 (229)
Bottom of unit ... 0
Flue panel . . .30 (762)
......................
36 (914)
36 (914)
36 (914)
0
NEC REQ’D CLEARANCES in (mm)
Between units, control box side 42 (1067)
Unit and ungrounded surfaces, control box side 36 (914)
Unit and block or concrete walls and other grounded
surfaces, control box side .... 42 (1067)
Í n/16'
(43.2)
-17 1/16'-
I (433 9)
LOPTIONAL SUPPLY
CG - Center of Gravity MATL - Material
LEGEND
COND — Condenser NEC — National Electrical Code
LV — Low Voltage REQ’D - Required
NOTE; Clearances must be maintained to prevent recirculation of
air from outdoor-fan discharge
AIR OPENING
OPTIONAL RETURN
AIR OPENING
3/16
(46 2)
7/8* (22.2) OIA
CONTROL ENTRY \
UNIT
48SS180040
48SS024040
48SS024080
48SS030040
48SS030060/080
48SS036060/080
48SS036100/120
48SS042060/080
48SS042100/120
UNIT
48SS018040
48SS024040
48SS024060
48SS030040
48SS030060/080
48SS036060/080
48SS036100/120
48SS042060/080
48SS042100/120
1 1/0' C20 6) OIA.
POWER ENTRY
1 5/8' (41 3) DIA
GAS ENTRY
1/2' - 14 NPT
GAS CONNECTION
ELECTRICAL
CHARACTERISTICS
F
In./mm
163/16/420 7
203/16/522.3
0 7/0' (22.23)
ALTERNATE LV ENTRY
EVAP COIL ACCESS
LEFT SIDE VIEW
FLUE PANEL
FLUE HOOD
2 5/16^
(58.0)
UNIT WEIGHT
lb kg
208/230-1-60
272
123
208/230-1-60 303 138
208/230-1-60 315
208/230-1-60 320
208/230-1-60
208/230-1-60
324 147 94/43
336 153
143 100/45
145 100/45
A B
81/37 62/28 76/35
97/44
86/39 76/35 111/50 63/29
208/230-1-60 348 158 89/40
208/230-1-60 375 170
208/230-1-60 387 176
G
In./mm
18's/i6/481.0
CENTER OF GRAVITY In./mm
X Y Z
25 07/637
27 07/688
26.98/685
26.71/678
27 15/689
20 59/523
23.35/593
23 27/591
23 46/596
22.36/568
10 85/276
95/43 86/39 119/54 75/34
98/45 89/40 122/55 78/35
27.50/698 22.48/571
27 40/696 22 44/570
22'5/ie/582.6
27.01/686 22 44/570
26.94/684
22 44/570
12 7/321
1 1/4' (31.75)
^ALTERNATE POWER ENTRY
2 3/16
(55 6)
CORNER WEIGHT
(Ib/kg)
C D
53/24
43/20
123/56
40/18
46/21 126/57 43/20
47/21 126/57 47/21
63/29 115/52 52/24
79/36 114/52 66/30
COMPRESSOR ACCESS PANEL
UNIT HEIGHT
(in./mm)
E
24 1/613
24 1/613
24.1/613
24 1/613
24 1/613
24.1/613
24 1/613
28.1/714
28 1/714
Fig. 2 - 48SS018-042 Without Base Rail, Unit Dimensions
REQ’D CLEARANCES FOR SERVICING, in (mm)
Duct panel
Unit top
Side opposite ducts
Compressor access ...
(Except for NEC requirements)
REQ’D CLEARANCES TO COMBUSTIBLE MATL in (mm)
Maximum extension of overhangs
Unit top . .
Duct side of unit . ...
Side opposite ducts . .
Bottom of unit
Flue panel
48 (1219)
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)
42 (1067)
. . 0
36 (914)
36 (914)
36 (914)
14 (356)
. 0
9 (229)
. . .0
30 (762)
52 49 9/16'
(1320.8) (1259 3)
-45 1/2'
OPTIONAL SUPPLY
AIR OPENING
OPTIONAL RETURN
AIR OPENING
^1 13/16'
(46 2)
7/8' (22.2) OIA
CONTROL ENTRY
I 5/8' (41 3) DIA
GAS ENTRY
1/2' - 14 NPT
GAS CONNECTION
REAR VIEW
UNIT
ELECTRICAL
CHARACTERISTICS
48SS018040 208/230-1-60
48SS024040 208/230-1-60
48SS024060 208/230-1-60
48SS030040 208/230-1-60, 208/230-3-60
48SS030060/080 208/230-1-60, 208/230-3-60
48SS036060/080 208/230-1-60, 208/230-3-60, 460-3-60, 575-3-60
48SS036100/120 208/230-1-60, 208/230-3-60, 460-3-60, 575-3-60
48SS042060/080
208/230-1-60, 208/230-3-60, 460-3-60 399 181 101/46 92/42
48SS042100/120 208/230-1-60, 208/230-3-60, 460-3-60 411
UNIT
48SS018040
F
in./mmGin./mm
CENTER OF GRAVITY in./mm
X
Y Z
25 04/636 22 72/577
48SS024040 26 90/683 3 20 17/512 3
48SS024060 26 82/681 2 20.22/513 6
48SS030040
48SS030060/080
48SS036060/080
19%/504.8 22W565 4
26 57/674.9 20.1/509.3
26 93/684
21 1/535.4
27.31/693 7 21 0/532 6
13 16/334 3
48SS036100/120 27 23/691 6 21 0/533 1
48SS042060/080
48SS042100/120
23%/606 4 26V4/666 8
26 87/682 5 21 0/533 1
26.81/681 21 0/533 7
14 96/380
UNIT WEIGHT
lb
296 135
327
kg
149 103/47 49/22
339 155
106/48 52/24
CORNER WEIGHT
A B
87/40 68/31
344 157 106/48 53/24
356
162
102/46 71/32
360 164 92/42 82/37
372
169 95/43 85/39
187 104/47
CG — Center of Gravity MAT’L — Material
COND — Condenser NEC — National Electrical Code
LV — Low Voltage REQ'D — Required
NOTE: Clearances must be maintained to prevent recirculation of
air from outdoor-fan discharge
95/43
(Ib/kg)
C D E
82/37 59/27
129/59 46/21 27 4/697
132/60 49/22 27 4/697
132/60 53/24 27 4/697
123/56 60/27 27 4/697
117/53
69/31 27.4/697
120/55 72/33
125/57
81/37
128/58 84/38 31.4/798
LEGEND
UNIT HEIGHT
(in./mm)
27.4/697
27 4/697
31 4/798
Fig. 3 — 48SS018-042 With Optional Base Rail Unit Dimensions
o 7/8 (22.23)
ALTERNATE LV ENTRY
1 1/4 (31.75)
ALTERNATE POWER ENTRY
t
5/8 -
(16 S)
BLOWER ACCESS -
PANEL
COMPRESSOR ACCESS PANEL
RIGHT SIDE VIEW
1 13/16'
(46.2)
OPTIONAL SUPPLY
AIR OPENING
-4 3/4'
(120 6)
12l5/1215/16
i
(312.7)
BURNER AND CONTROL BOX
ACCESS PANEL
REQ’D CLEARANCES FOR SERVICING, in. (mm)
Duct panel . .
Unit top .
Side opposite ducts
Compressor access
(Except for NEC requirements)
. . 0
36 (914)
36 (914)
36 (914)
REQ’D CLEARANCES TO COMBUSTIBLE MAIL in (mm)
Maximum extension of overhangs . . 48(1219)
Unit top. ... ... 14(356)
Duct side of unit ... .0
Side opposite ducts .... 9 (229)
Bottom of unit
Flue panel 30 (762)
......................
. . 0
NEC REQ’D CLEARANCES in (mm)
Between units, control box side .42(1067)
Unit and ungrounded surfaces, control box side . . 36(914)
Unit and block or concrete walls and other grounded
surfaces, control box side . . . ... 42 (1067)
y-2 3/16' ^3/4' NPT (19.0)
(55 6) DRAIN OUTLET
FRONT VIEW
UNIT
ELECTRICAL
CHARACTERISTICS
UNIT WEIGHT
lb
kg
48SS048080 208/230-1-60 414 188
48SS048100/120/140
208/230-1-60
426
193
48SS060080 208/230-1-60 453 206
48SS060100/120/140 208/230-1-60 465
UNIT
48SS048080
48SS048100/120/140
48SS060080 28.36/720
48SS060100/120/140
CENTER OF GRAVITY (In./mm)
X
28 76/731
28.42/722
Y
23 46/596
23.42/595
23 27/591
27 95/710
23 23/590
211
15 35/390
15.35/390
15.35/390
15 35/390
Fig. 4 — 4888048,060 Without Base Rail, Unit Dimensions
CORNER WEIGHT
(Ib/kg)
B C D
A
83/38 158/72
107/49
86/39 159/72 71/32
110/50
93/42
117/53
96/44
120/55
Z
66/30
167/76 76/35
167/76 82/37
LEGEND
CG — Center of Gravity MAT’L
COND — Condenser NEC
LV — Low Voltage REQ'D
NOTE: Clearances must be maintained to prevent recirculation of
air from outdoor-fan discharge.
— Material
— National Electrical Code
— Required
o 15/16^
1 9/16' (23.8)„
(39.7)¿ B.
-45 1/2
ALTERNATE POWER ENTRY
1 1/4'
C31.75)
H
OPTIONAL RETURN
AIR OPENING
52 49 9/16"
(1320.0) (1259.3)
13/16
(46 2)
OPTIONAL SUPPLY
AIR OPENING
REQ'D CLEARANCES FOR SERVICING, in. (mm)
Duct panel
Unit top
Side opposite ducts
Compressor access
(Except for NEC requirements)
..................
......................
36 (914)
36 (914)
36 (914)
REQ’D CLEARANCES TO COMBUSTIBLE MAIL in (mm)
Maximum extension of overhangs
Unit top
...........................
Duct side of unit ... ... 0
Side opposite ducts . ... 9 (229)
Bottom of unit ... ... 0
Flue panel ... 30 (762)
. . .14 (356)
..................
48 (1219)
NEC REQ’D CLEARANCES in (mm)
Between units, control box side
Unit and ungrounded surfaces, control box side 36 (914)
Unit and block or concrete walls and other grounded
surfaces, control box.side . . 42 (1067)
...............
42 (1067)
0
UNIT
48SS048080
48SS048100/120/140
48SS060080
48SS060100/120/140
UNIT
48SS048080
48SS048100/120/140
48SS060080
48SS060100/120/140
COMPRESSOR ACCESS PANEL
208/230-1-60, 208/230-3-60, 460-3-60, 575-3-60 438 199 113/51 89/40 164/75 72/33
208/230-1-60, 208/230-3-60, 460-3-60, 575-3-60
208/230-1-60, 208/230-3-60, 460-3-60, 575-3-60
208/230-1-60, 208/230-3-60, 460-3-60, 575-3-60
CENTER OF GRAVITY (in./mm)
X
28.54/724 9 20 00/508
28.22/716 8
28.18/715.6
27 79/705.9
ELECTRICAL
CHARACTERISTICS
Y Z
17.66/448 6
20.05/509 3
20.19/512.8
17 66/448.6
17.66/448 6
20.23/513.8 17 66/448 6
UNIT WEIGHT
lb kg
450 205
477 217
489
CG — Center of Gravity
COND — Condenser
LV — Low Voltage
222 126/57 102/46 173/79 88/40
NOTE: Clearances must be maintained to prevent recirculation of
air from outdoor-fan discharge.
CORNER WEIGHT
(Ib/kg)
A B C D
116/53
92/42 165/75
123/56 99/45 173/79
LEGEND
MAT’L — Material
NEC — National Electrical Code
REQ'D — Required
77/35
82/37
Fig. 5 - 4888048,060 With Optional Base Rail, Unit Dimensions
5
8 l/4'-<
(203.6)
OPTIONAL SUPPLY
AIR OPENING
-4 13/16
(122,2)
^
„
12 5/16
(312 7)
OPTIONAL RETURN
AIR OPENING
13/16'
(46 2)
1 1/4' 01.0) DIA
ALTERNATE POWER ENTRY
LEFT SIDE VIEW
REQ’D CLEARANCES FOR SERVICING in. (mm)
Duct panel .0
Unit top 36(914)
Side opposite ducts 36(914)
Compressor access 36(914)
(Except for NEC requirements)
REQ’D CLEARANCES TO COMBUSTIBLE MAIL, in. (mm)
Maximum extension of overhangs . . 48(1219)
Unit top........................... 14 (356)
Duct side of unit . .... .0
Side opposite ducts 9 (229)
Bottom of unit . . .... . . 0
Flue panel . . 30 (762)
NEC REQ’D CLEARANCES in. (mm)
Between units, control box side 42 (1067)
Unit and ungrounded surfaces, control box side . 36 (914)
Unit and block or concrete walls and other grounded
surfaces, control box side .... .42(1067)
BLOWER ACCESS-
PANEL
5/0- ^COMPRESSOR ACCESS PANEL
UNIT
48SX024040
48SX024060
48SX030040
48SX030060/080
48SX036060/080
48SX036100/120
UNIT
48SX024040
RIGHT SIDE VIEW
ELECTRICAL
CHARACTERISTICS
208/230-1-60 333 151
208/230-1-60
208/230-1-60
208/230-1-60 348 158
208/230-1-60 366 166 94/43
208/230-1-60 378
CENTER OF GRAVITY (in./mm)
X
26.71/678 20.06/510
48SX024060 26.64/677 20.12/511
BURNER AND CONTROL BOX
ACCESS PANEL
UNIT WEIGHT
lb kg A
345 157
336 153 97/44 66/30 118/54 55/25
172
Y
Z
12 65/321
12 65/321
48SX030040 27 06/687 21 05/535 12.65/321
48SX030060/080
48SX036060/080
48SX036100/120
26.98/685 21 07/535 12.65/321
27.14/689
27 06/687
21 10/536 12 65/321
21 12/536
12 65/321
CORNER WEIGHT
B
104/47 50/23
107/49
100/45
53/24
69/31 121/55 58/26
84/38
97/44
87/40
(Ib/kg)
C
130/59
133/60
117/53
120/55
D
49/22
52/24
71/32
74/34
LEGEND
CG — Center of Gravity
COND — Condenser
LV — Low Voltage
NOTE: Clearances must be maintained to prevent recirculation of
air from outdoor-fan discharge.
MAT’L - Material
NEC — National Electrical Code
REQ’D — Required
Fig. 6 — 48SX024-036 Without Base Rail, Unit Dimensions
REQ'D CLEARANCES FOR SERVICING in (mm)
Duct panel
Unit top ... .
Siete opposite ducts
Compressor access
(Except for NEC requirements)
REQ'D CLEARANCES TO COMBUSTIBLE MATE in (mm)
Maximum extension of overhangs
Unit top
Duct side of unit .
Side opposite ducts
Bottom of unit
Flue panel
..........................
48 (1219)
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
7/8 (22.2) OIA
CONTROL ENTRY
42 (1067)
42 (1067)
36 (914)
36 (914)
36 (914)
14 (356)
. 0
9 (229)
. . 0
30 (762)
36 (914)
OPTIONAL RETURN
AIR OPENING
52 49 9/16"
(1320.8) (1259.3)
0
^1 13/16"
(46.2)
1 11/16'
(43.2)
17 1/16 -
I (433.9)
^OPTIONAL SUPPLY
AIR OPENING
1 5/8 (41 3) OIA
GAS ENTRY
1/2" - 14 NPT
GAS CONNECTION
REAR VIEW
UNIT
48SX024040
ELECTRICAL
CHARACTERISTICS
208/230-1-60
48SX024060 208/230-1-60
48SX030040 208/230-1-60
UNIT WEIGHT
lb
357 163 110/50
369 168 113/51 59/27
360
48SX030060/080 208/230-1-60 372
164
169 106/48 75/34 127/58 64/29
kg
LEFT 510E VIEW
A B
103/47 72/33
48SX036060/080 208/230-1-60, 208/230-3-60, 460-3-60 390 177 100/45
48SX036100/120 208/230-1-60, 208/230-3-60, 460-3-60 402
UNIT
48SX024040
CENTER OF GRAVITY (In./mm)
X Y
26 57/674 9
20 17/512 3 14 96/380 0
183 103/47 93/42 127/57
Z
48SX024060 26 51/673 3 20.22/513 6 14 96/380 0
48SX030040 26 90/683 3 21.09/535 7 14 96/380 0
48SX030060/080 26 83/681.5 21 11/536.2 14 96/380.0
48SX036060/080 26.99/685 5 21 14/537 0 14.96/380 0
48SX036100/120 26 92/683 8 21 14/537 0
14 96/380.0
Fig. 7 — 48SX024-036 With Optional Base Rail, Unit Dimensions
CORNER WEIGHT
(Ib/kg)
C D
136/62
56/25
55/25
139/63 58/26
124/56 61/28
90/41 123/56 77/35
80/36
LEGEND
CG — Center of Gravity MAT'L —
COND — Condenser NEC —
LV — Low Voltage REQ’D —
NOTE: Clearances must be maintained to prevent recirculation of
air from outdoor-fan discharge
Material
National Electrical Code
Required
RIGHT SIDE VIEW
REQ'D CLEARANCES FOR SERVICING in. (mm)
Duct panel ... . . 0
Unit top 36(914)
Side opposite ducts 36 (914)
Compressor access 36(914)
(Except for NEC requirements)
REQ’D CLEARANCES TO COMBUSTIBLE MATL in (mm)
Maximum extension of overhangs
Unit top
Duct side of unit .
Side opposite ducts . .
Bottom of unit . .
Flue panel ...
. 48 (1219)
14 (356)
. 0
9 (229)
. . 0
30 (762)
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
7/8' C22.2) DIA.
CONTROL ENTRY
42 (1067)
36 (914)
42 (1067)
1 1/4 (31.8) DIA
ALTERNATE POWER ENTRY
7/0 (22.2) DIA
ALTERNATE LV ENTRY
. 17 1/16'
(433.9)
OPTIONAL SUPPLY
AIR OPENING
COMPRESSOR ACCESS PANEL
EVAP COIL
OPTIONAL RETURN
AIR OPENING
^1 13/16'
C46.2)
UNIT
488X042060,080
488X042100,120
48SX048080
48SX048100/120/140
UNIT
48SX042060,080
48SX042100,120
48SX048080
48SX048100/120/140
• 1 5/8' (41.3) DIA
GAS ENTRY
1/2' - 14 NPT
GAS CONNECTION
REAR VIEW
ELECTRICAL
CHARACTERISTICS
208/230-1-60
208/230-1-60
208/230-1-60
UNIT WEIGHT
391
403 183 103/47 94/43 123/56
422
208/230-1 -60 434 197
CENTER OF GRAVITY (in./mm)
X
26 66/677
Y Z
21 19/538
26.61/676 21.21/539 15 35/390
28 45/723 19.95/507 15.35/390
28.35/720 19 99/508 15 35/390
Fig. 8 — 488X042,048 Without Base Rail, Unit Dimensions
lb
CORNER WEIGHT
kg
A B C
178 100/45 91/41 120/55
192
109/50 85/39
112/51 88/40
CG — Center of Gravity MAT’L —
15 35/390
COND — Condenser NEC —
LV - Low Voltage REQ’D -
(Ib/kg)
D
80/36
83/38
158/72
161/73
70/32
73/33
LEGEND
Material
National Electrical Code
Required
NOTE: Clearances must be maintained to prevent recirculation of
air from outdoor-fan discharge
10 1/16
(450 0)
5 5/0
(142.9)t
1 3/16-
(20 6)
— 10 -I
(253.0)
RIGHT SIDE VIEW
ALTERNATE POWER ENTRY
EVAP COIL ACCESS
ALTERNATE LV ENTRY
-11 1/21
(292.1)
12 13/16'.
LEFT SIDE VIEW
1 \/4
C31.75)
0 7/0
(22.23)\
13 1/2'
(342.9)
ACCESS PANEL
_-3 5/16'
'^(BA.I)
37 7/16"
(950 9)
11 'S/16'
■ (207.31.4 f
1 3/8'(34.9)
1 9/16' (23.8)„
(39.7)^ B
S2 49 g/16'
(1320.8) (1259.3)
REQ’D CLEARANCES FOR SERVICING in. (mm)
Duct panel . . ... . . 0
Unit top . . 36(914)
Side opposite ducts ... 36(914)
Compressor access 36(914)
(Except for NEC requirements)
REQ’D CLEARANCES TO COMBUSTIBLE MATL. in (mm)
Maximum extension of overhangs
Unit top
Duct side of unit .
Side opposite ducts
Bottom of unit
Flue panel
LEGEND
CG
— Center of Gravity
COND
— Condenser
LV
— Low Voltage
MAT’L
— Material
NEC
— National Electrical Code
REQ’D
— Required
o 15/16=^
.......................
OPTIONAL RETURN
OPTIONAL SUPPLY
AIR OPENING
~ 4Í7l219)
........................0
COMPRESSOR ACCESS PANEL
14 (356)
. . 9 (229)
. . 0
. . 30 (762)
AIR OPENING
13/16'
(46 2)
W
UNIT
488X042060,080
488X042100,120
488X048080
ELECTRICAL
CHARACTERI8TIC8
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60 427 194 109/50
208/230-1-60, 208/230-3-60, 460-3-60 446 293 115/52 91/41 164/75
UNIT WEIGHT
lb kg
189 106/48
415
488X048100/120/140 208/230-1-60, 208/230-3-60, 460-3-60 458 208
UNIT
488X042060,080
488X042100,120
48SX048080
488X048100/120/140 28.16/715.3
CENTER OF GRAVITY (in./mm)
X Y Z
26.55/674 4 21 22/539 0
26.50/673.0 21.24/539.6
28.25/717 6 20 04/509 0
20 08/510 0 17.66/448 6
17 66/448.6
17.66/448.6
17.66/448.6
Fig. 9 — 488X042,048 With Optional Base Rail, Unit Dimensions
CORNER WEIGHT
A
B C D
97/44 126/57 86/39
100/45 129/59 89/40
118/54
94/43 167/76 79/36
(Ib/kg)
76/35
NOTE: Ciearances must be maintained to prevent recirculation of
air from outdoor-fan discharge
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)
42 (1067)
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.
INSPECT SHIPMENT — Inspect for shipping damage while
unit is still on shipping pallet. If unit appears to be dam
aged or is torn loose from its anchorage, have it examined
by transportation inspectors before removal. Forward claim
papers directly to transportation company. Manufacturer is
not responsible for any damage incurred in transit.
Check all items against shipping list. Immediately notify
the nearest Carrier Air Conditioning office if any item is
missing.
To prevent loss or damage, 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
flashing. Ductwork must be attached to curb.
IMPORTANT: The gasketing of the unit to the roof
curb is critical for a watertight seal. Install gasketing
material supplied with the roof curb. Improperly ap
plied gasketing can also result in air leaks and poor
unit performance.
Curb should be level to within Vi inch. This is necessary
for unit drain to function properly. Refer to accessory roof
curb installation instructions for additional information as
required.
SLAB MOUNT — Place the unit on a solid, level concrete
pad that is a minimum of 4 in. thick with 2 in. above grade.
The slab should be flush on the front of the unit (to allow
condensate drain installation) and should extend 2 in. on
the three remaining sides of the unit. See Fig. 11. Install a
6-in. gravel apron in front of condenser-air inlets to prevent
obstruction of airflow by grass or shrubs. Do not secure the
unit to the slab except when required by local codes.
FLUSH MOUNT — Place side of unit with duct panel flush
against transition. On units with optional base rails, the skirt
on duct-panel side of unit can be removed or relocated to
allow unit to be mounted flush against transitions that ex
tend below basepan of unit. To move skirt, proceed as
follows:
1. Remove 4 screws holding skirt to base rail Retain screws.
2. Remove skirt or slide skirt inwards until alternate clear
ance holes align with base rails.
3. Secure with screws removed in Step 1. Holes align with
base rails.
To remove wood support under unit (with base rail only),
loosen 4 screws above rigging holes and slide assembly out
through rectangular hole.
Step 3 — Field Fabricate Ductwork — Secure all
ducts to roof curb and building structure on vertical dis
charge units. Do not connect ductwork to unit. For horizon
tal applications, field-supplied flanges should be attached
to horizontal discharge openings and all ductwork should
be secured to the flanges. Insulate and weatherproof all
external ductwork, joints, and roof openings with counter
flashing and mastic in accordance with applicable codes.
Ducts passing through an unconditioned space must be
insulated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with ap
plicable fire codes.
A minimum clearance is not required around ductwork.
Cabinet return-air static shall not exceed — .25 in. wg.
Step 4 — Provide Clearances — The required min
imum operating and service clearances are shown in
Fig. 2-9. Adequate combustion, ventilation, and condenser
air must be provided.
A CAUTION
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 minimum clearance under a partial overhang (such as a
normal house overhang) is 48-in. above the unit top. The
maximum horizontal extension of a partial overhang must
not exceed 48 inches.
Do not place the unit where water, ice, or snow from an
overhang or roof will damage or flood the unit. Do not 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.
Step 5 — Rig and Place Unit
A CAUTION
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.
t
10
FLAT
PITCHED
PART NUMBER
50SS900015
50SS900016
50SS900017
“A”
8" [203]
11" [279]
14" [356]
50SS900019 8" [203]
50SS900020
50SS900021
50SS900022
50SS900023
50SS900024
8" [203] 13«/ie" [344]
8" [203] 16%" [416]
8" [203] 19V4" [489]
8" [203] 22%" [568]
8" [203] 25%" [651]
“B” PITCH
— -
— —
— —
10%" [276]
1:12
2:12
3:12
4.12
5:12
6:12
NOTES:
Roof curb must be set up for unit being instaiied
1
Seai strip must be applied as required for unit being instaiied.
2
Dimensions in [ ] are in miilimeters
3
Roof curb is made of 16 gage steel
4
Attach ductwork to curb (flanges of duct rest on curb).
5
Service ciearance 4 ft on each side
6.
7 Direction of airfiow.
8. Insulated panels: 1-in. thick fiberglass 1 lb density.
Fig. 10 — Roof Curb Dimensions
11
20
FLUSH WITH SLAB-
'1
■ ^ -I
T
___
^
2 0”
r
J
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
A CAUTION
All panels must be in place when rigging.
12 0”
CONCRETE SU\B-
Fig. 11 - Slab Mounting Details
SECURE SCREW
AGAINST BASEPAN
TO HOLD LIFTING
BRACKET IN PLACE
DETAIL A
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
A CAUTION
All panels must be in place when rigging.
UNIT
48SS
Size lb
018
024
030
036
042 447 203
048
060
UNIT
48SX
024 405
030 408 185
036 438 199
042
048 494 224
MAX
WEIGHT
kg
332 150
375 170
384 174
408 185
486 220
525 238
184
210
463
A
mm in. mm in. mm
in.
49 4 1255 22.0 559 24.85 631
40.4 1255
B
24.3
618
22 4
570 24.85 631
565 24 85
22.3
22.5 570.7
21.0 533
21.5 545
22 8
579 28.9 733
22 4
569 28.9 733
22.4
569 28.9 733
22.8 579 34.9 885
21.1
536 34.9 885
C
24 85
631
631
28.85 733
34.85 885
34.85 885
UNIT
48SS
Size lb
018
024
030
036
042 435 197
048 474 215
060 513 233
UNIT
48SX
024 393 178
030 396 180
036 426 193 49 4
042 451 205
048 482 219
MAX
WEIGHT
in.
kg
145
320
165
363
172
380
396 180 49 4
A B C
mm in. mm in. mm
24.4 619
22.6 574 28.2 715
22.5 571 28.2 715
1255 22.2
22.6 574 32.2 816
21.2 538 38.2 969
21.6 549 38.2 969
22.9
22.6 574
1255 22.5
22.9
21.3 540
28.2
28.2 715
563
582 32.2
32.2
571 32.2
582 38.2
38.2
715
816
816
816
969
969
Fig. 13 - Suggested Rigging For Units With
Optional Base Rail
UNITS WITHOUT BASE RAIL - If accessory rigging
brackets are to be used for rigging, install them as follows:
A WARNING
Secure screws and paint protectors solidly against unit
basepan to hold lifting brackets in position.
Never use lifting brackets when the temperature is be
low -10 F.
Never exceed 200 lbs per bracket of lifting force.
Never use lifting brackets for lifting other models of
air-conditioning units.
Lifting point should be directly over the unit center of
gravity.
1. Position brackets as close to the corners of unit as pos
sible. Be sure brackets are well outside of center of grav
ity. (See Fig. 2, 4, 6, 8, and 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.
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.
12
UNITS WITH OPTIONAL BASE RAIL - Lifting holes
are provided in optional base rail as shown in Fig. 12. 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.
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
¥4 in. NPT fitting which exits through the compressor ac
cess panel. See Fig. 2-9 for location.
Install field-supplied condensate trap at end of conden
sate connection to ensure proper drainage. See Fig. 14.
V'MIN.
If the installation requires draining the condensate water
away from the unit, install a 2-in. trap at the condensate
connection to ensure proper drainage. 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 overflow
ing. Prime the trap with water. Connect a drain tube using
a minimum of y4-in. PVC or V4-m. copper pipe (all fieldsupplied) at the outlet end of the 2-in. trap. Do not under
size 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.
Condensate water can be drained directly onto the roof in
rooftop installations (where permitted) or onto a gravel apron
in ground-level installations. When using a gravel apron,
make sure it slopes away from the unit.
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.
A CAUTION
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.
Install the flue hood as follows:
1. Remove from shipping location. Place vent cap assem
bly over flue panel. Orient screw holes in vent cap with
holes in the flue panel.
2. Secure flue hood to flue panel by inserting a single
screw on the right side, the left side, and the top of flue
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 '/2-in. FPT gas inlet on
the manual shutoff or gas valve.
Install a gas supply line that runs to the heating section.
Refer to Table 3 and the National Fuel Gas Code (NFGC)
for gas pipe sizing.
mended that a black iron pipe is used. Check the local util
ity for recommendations concerning existing lines. Size gas
supply piping for 0.5 in. wg maximum pressure drop. Never
use pipe smaller than the Vi-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.
When installing the gas supply line, observe local codes
pertaining to gas pipe installations. Refer to the NFGC ANSI
(American National Standard’s Institute) Z223.1-1988 NFPA
(National Fire Protection Association) 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
'/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 appro
priate straps, hangers, etc. Use a minimum of one hanger
every 6 ft. For pipe sizes larger than
ommendations 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.
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.
7. Pressure-test all gas piping in accordance with local and
national plumbing and gas codes before connecting pip
ing to unit.
NOTE: Pressure test the gas supply system after the gas
supply piping is connected to the gas valve. The supply
piping must be disconnected from the gas valve during
the testing of the piping systems when test pressure 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.
Do not use cast-iron pipe. It is recom
'/2 in., follow rec
13
Table 1 — Physical Data — Unit 48SS
UNIT SIZE 48SS
NOMINAL CAPACITY (ton)
OPERATING WEIGHT (lb)
Without Base Rail
With Optional Base Rail
COMPRESSORS
Quantity
REFRIGERANT (R-22)
Charge (lb)
REFRIGERANT METERING DEVICE Aoutrol™ Device
Orifice ID (in.)
CONDENSER COIL
Rows...Fins/in.
Face Area (sq ft)
CONDENSER FAN
Nominal Cfm
Diameter (in.)
Motor Hp (Rpm)
EVAPORATOR COiL
Rows Fins/in.
Face Area (sq ft)
EVAPORATOR FAN
Nominai Airflow (Cfm)
Size (in.)
FURNACE SECTION*
Burner Orifice No. (Qty...driii size)
Naturai Gas
Burner Orifice No. (Qty...drill size)
Propane Gas
RETURN-AiR FILTERS (in.)f
Throwaway
018040 024040
1V2 2 2
272 303 315 320 324 324
296
Rotary Reciprocating
1
2 60 2 75 2 75 3 40 3 40 3 40
.030
1. .17 1. .17
5.95
1700
18 18
Vs (850) Vs (850)
3 15
1 83 2 29
600
10 X 10 10 X 10
1. 32 1 32 2 38 1 ..32
1...41 1 .41
20 X 20 20 X 20 20 X 20 20 X 24 20 X 24 20 X 24 20 X 24
327
.030 030 030 .030 .030 032
5 95 5 95 5 95 5.95 5 95 5 95
1700 1700 1900 1900 1900 1900
3 15 3 15
800 800 1000 1000 1000 1200
024060 030040 030060 030080 036060
339 344 356 356
1. .17 2. .17 2. .17
18 18 18 18 18
Va (850) Va (850) Va (850)
2 29
10 X 10
2 46
2V2 2V2 2V2
1
2...17
Va (850)
3 .15
2.29
10 X 10
1...41 2.. 46 2 42 2. 46
3 . 15 3.. 15 3 15
2 29 2 29 3 06
Direct Drive
10 X 10
2 38
10 X 10 10 X 10
2 32
3
336
360
4 30
2. .17 2. .17 2. .17
'A (1050)
2 38 2. 32
036080 036100
3 3
336 348 348
360
4 30
032
5 95 5 95 5 95
1900 1900 1900
18 18 18
'A (1050) '/4 (1050) 'A (1050)
3 15 3 15 3 15
3 06 3 06 3.06
1200 1200 1200
10 X 10 10 X 10 10 X 10
2 42 3 44
20 X 24 20 X 24 20 X 24
036120
3
372 372
4 30
032
3 36 3 32
4.30
.032
2. .17
3 42
t
UNIT SIZE 48SS
NOMINAL CAPACITY (ton)
OPERATING WEIGHT (lb)
Without Base Raii
With Optionai Base Rail
COMPRESSORS
Quantity
REFRIGERANT (R-22)
Charge (lb)
REFRIGERANT METERING Acutroi' Device
DEVICE
Orifice ID (in.)
CONDENSER COIL
Rows...Fins/in.
Face Area (sq ft)
CONDENSER FAN
Nominal Cfm
Diameter (in.) 18
Motor Hp (Rpm) 'A (1050)
EVAPORATOR COIL
Rows Fins/in. 3. .15
Face Area (sq ft)
EVAPORATOR FAN Direct Drive
Nominal Airflow (Cfm)
Size (in.)
FURNACE SECTiON*
Burner Orifice No.
(Qty...driii size)
Natural Gas
Burner Orifice No.
(Qty...driil size)
Propane Gas
RETURN-AIR FILTERS (in.)t
Disposable
•Based on altitude of 0-2000 feet
tRequired filter sizes shown are based on the larger of the ARI (Air Conditioning & Refrigeration Institute) rated
cooling airflow or the heating airflow at a velocity of 300 ft/min for disposable type or 450 ft/min for high-capacity
type Air filter pressure drop must not exceed 0 08 in wg
**Sq inch. Filter is mounted external to unit
042060 042080 042100 042120 048080 048100 048120 048140
3'/2
375 375 387 387 414
399
5 20
034 .034
2. .17 2. .17 2. 17
7.04 7 04
1900
3 33 3.33
1400 1400
10 X 10 10 X 10 10 X 10
2. 38 2 32
2. 46
24 X 24
3V2
399 411 411
Reciprocating
5 20
1900
18
'A (1050)
3. .15
2 42
24 X 24
3Va 3'/2 4 4 4 4
5.20 5 20 6.50 6 50
034 034 030 030
7.04 7 04 8.67 8 67 8 67 8 67
1900 1900 2400
18 18 20 20
'A (1050) '/4 (1050) Vs (1050)
3. .15 3...15 3.. 15 3. 15 3. 15 3. 15 4. 15
3 33 3.33 4 44 4.44 4.44 4.44
1400 1400 1600 1600 1600 1600
3 36 3.32
3 44
24 X 24 24 X 24 24 X 30 24 X 30
438 450 450 450 477
2...17 2...17 2. 17
10 X 10 10 X 10 10 X 10 10 X 10 10 X 10
2 32
3 42
2 42
426 426 426 453
6 50
030
2. .17
2400 2400 2400
Vs (1050) V3 (1050) Vs (1050) Vs (1050) Vs (1050) V3 (1050) Vs (1050)
*
*
3 36 3.. 32 3.. 30
3 44 3 42 3 40
20
24 X 30 816** 24 X 30
060080 060100 060120 060140
Hermetic Scroii
6 50
030
2. 17
20
7 00
030
2. .17
8 67 8 67 8 67 8 67
2400 2400 2400 2400
4.44 4.44 4.44 4.44
1995 1995 1995
10 X 10 10 X 10 10 X 10 10 X 10
2 32 3. 36 3.32
3 42 3. 44 3.42 3 40
5
20
5
465
489
7 00 7 00 7 00
030 030 030
2. .17 2. .17 2. .17
20
4.. 15 4.. 15 4. 15
24 X 30 24 X 30 960**
5 5
465 465
489 489
20
20
1995
3 30
14
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