50SS018-060
50SX024-060
Single-Package Cooling Units
Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . 1-12
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
RECEIVING AND INSTALLATION . . . . . . . . . . . 13-26
Step 1 — Check Equipment . . . . . . . . . . . . . . . . . . 13
• IDENTIFY UNIT
• INSPECT SHIPMENT
Step 2 — Provide Unit Support . . . . . . . . . . . . . . 13
• ROOF CURB
• SLAB MOUNT
Step 3 — Provide Clearances . . . . . . . . . . . . . . . . 13
Step 4 — Rig and Place Unit . . . . . . . . . . . . . . . . . 13
• UNITS WITHOUT BASE RAILS
• UNITS WITH OPTIONAL BASE RAILS
Step 5 — Select and Install Ductwork . . . . . . . . 16
• CONVERTING HORIZONTAL DISCHARGE
UNITS TO DOWNFLOW (VERTICAL) DISCHARGE
— STD (NON-ICM) UNITS
• CONVERTING HORIZONTAL DISCHARGE UNITS
TO DOWNFLOW (VERTICAL) DISCHARGE
— ICM UNITS
Fig. 1 — Unit 50SX With Optional Base Rail Shown
NOTE TO INSTALLER — Before the installation, READ
THESE INSTRUCTIONS CAREFULLY AND COM-
PLETELY. Also, make sure the Owner’s Manual and Serv-
ice Instructions are left with the unit after installation.
• ACCESSORY DUCT FLANGE KIT INSTALLATION
Step 6 — Provide for Condensate Disposal . . . 20
Step 7 — Install Electrical Connections . . . . . . 21
• HIGH-VOLTAGE CONNECTIONS
• ROUTING POWER LEADS INTO UNIT
• CONNECTING GROUND LEAD TO
WIRE-BINDING SCREW
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.
• ROUTING CONTROL POWER WIRES — STD
NON-ICM UNITS (24 V)
• ROUTING CONTROL POWER WIRES — ICM
UNITS (24 V)
• SPECIAL PROCEDURES FOR 208-V
OPERATION
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26,27
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.
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27-39
Check for Refrigerant Leaks . . . . . . . . . . . . . . . . . 27
Start-Up Cooling Section and
Make Adjustments . . . . . . . . . . . . . . . . . . . . . . . . 27
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40,41
Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Unit Top Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Evaporator Blower and Motor . . . . . . . . . . . . . . . . 40
Condenser Coil, Evaporator Coil,
Before performing service or maintenance operations on
system, turn off main power to unit. Turn off accessory
heater power switch if applicable. Electrical shock can
cause personal injury.
and Condensate Drain Pan . . . . . . . . . . . . . . . . 41
Condenser Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Electrical Controls and Wiring . . . . . . . . . . . . . . . 41
Refrigerant Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Evaporator Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Metering Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Liquid Line Strainer . . . . . . . . . . . . . . . . . . . . . . . . . 41
General — 50SS,SX cooling units are fully self-contained
and designed for outdoor installation. See Fig. 1. As shown
in Fig. 2-9, both small- and large-cabinet units are shipped
in a horizontal-discharge configuration for installation on
a ground-level slab. All units can be converted to down-
flow discharge configurations for rooftop applications. See
Fig. 10 for roof curb dimensions.
TROUBLESHOOTING COOLING CHART . . . . . 42,43
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-1
Instructions continued on page 13.
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. 535-022 Printed in U.S.A. Form 50SS,SX-4SI Pg 1 5-95 Replaces: 50SS,SX-3SI
Tab 1b 6b
4
REQUIRED CLEARANCES TO COMBUSTIBLE MATERIAL — in. (mm)
Unit Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 (356)
Duct Side of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 (51)
Side Opposite Ducts . . . . . . . . . . . . . . . . . . . . . . . . 14 (356)
Bottom of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0
Vertical Discharge First 12 in. (305) of Supply Duct . . . . . . . 1 (25)
NECESSARY REQUIRED CLEARANCES — in. (mm)
Between Units, Control Box Side . . . . . . . . . . . . . . . . 42 (1067)
Unit and Ungrounded Surfaces, Control Box Side . . . . . . 36 (914)
Unit and Block or Concrete Walls and Other Grounded
Surfaces, Control Box Side . . . . . . . . . . . . . . . . . . . 42 (1067)
REQUIRED CLEARANCES FOR SERVICING — in. (mm)
Evaporator Coil Access Side . . . . . . . . . . . . . . . . . . . 30 (762)
Control Box Access Side . . . . . . . . . . . . . . . . . . . . . . 30 (762)
(Except for Necessary Requirements)
Unit Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 (914)
Side Opposite Ducts . . . . . . . . . . . . . . . . . . . . . . . . 30 (762)
CENTER OF GRAVITY (in./mm)
UNIT
50SS
X
Y
Z
018
024
030
036
042
19.5/495
22.1/562
21.8/554
21.0/533
21.0/532
21.7/551
20.9/532
20.4/519
20.1/509
20.1/510
12.9/328
12.3/313
12.3/312
12.2/310
13.6/344
LEGEND
CG
COND
MAT’L
—
—
—
Center of Gravity
Condenser
Material
NEC
REQ’D
—
—
National Electrical Code
Required
NOTES:
1. Clearances must be maintained to prevent recirculation of air from
outdoor-fan discharge.
2. Dimensions in ( ) are in millimeters.
UNIT HEIGHT
(in./mm)
DIMENSION
(in./mm)
UNIT WT
CORNER WT (Lb/Kg)
UNIT
50SS
ELECTRICAL
CHARACTERISTICS
Lb
Kg
A
B
C
D
E
F
018
024
030
036
042
208/230-1-60
228
257
274
290
320
104
117
125
132
146
66/30
65/30
66/30
81/37
86/39
48/22
59/27
63/29
53/24
62/28
74/34
97/44
101/46
114/52
122/55
40/18
36/16
44/20
42/19
50/23
27.4/697
27.4/697
27.4/697
27.4/697
31.4/798
21.5/546
21.5/546
21.5/546
21.5/546
25.5/648
208/230-1-60
208/230-1-60, 208/230-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
Fig. 3 — Dimensions; Units 50SS018-042 with Optional Base Rail
3
REQUIRED CLEARANCES TO COMBUSTIBLE MATERIAL — in. (mm)
Unit Top
Duct Side of Unit .
Side Opposite Ducts
Bottom of Unit .
Vertical Discharge First 12 in. (305) of Supply Duct .
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. 14 (356)
. 2 (51)
. 14 (356)
. 0
. 1 (25)
CENTER OF GRAVITY (in./mm)
Y
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UNIT
50SS
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X
Z
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048
060
21.9/555
22.2/565
19.6/498
19.8/503
13.4/341
13.4/340
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NECESSARY REQUIRED 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 .
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. 42 (1067)
. 36 (914)
LEGEND
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CG
COND
MAT’L
—
—
—
Center of Gravity
Condenser
Material
NEC
REQ’D
—
—
National Electrical Code
Required
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. 42 (1067)
REQUIRED CLEARANCES FOR SERVICING — in. (mm)
Evaporator Coil Access Side
Control Box Access Side
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. 30 (762)
. 30 (762)
NOTES:
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1. Clearances must be maintained to prevent recirculation of air from outdoor-fan dis-
(Except for Necessary Requirements)
charge.
Unit Top
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. 36 (914)
. 30 (762)
2. Dimensions in ( ) are in millimeters.
Side Opposite Ducts
UNIT WT
CORNER WT (Lb/Kg)
UNIT
50SS
ELECTRICAL
CHARACTERISTICS
Lb
Kg
A
B
C
D
048
060
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
332
359
151
163
82/37
65/30
68/31
99/45
131/60
120/55
51/23
75/34
Fig. 4 — Dimensions; Units 50SS048,060 Without Base Rail
4
REQUIRED CLEARANCES TO COMBUSTIBLE MATERIAL — in. (mm)
CENTER OF GRAVITY (in./mm)
Y
UNIT
50SS
Unit Top .
Duct Side of Unit
Side Opposite Ducts
Bottom of Unit
Vertical Discharge First 12 in. (305) of Supply Duct
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. 14 (356)
. 2 (51)
. 14 (356)
. 0
. 1 (25)
X
Z
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048
060
21.7/550
22.0/560
19.7/501
19.9/506
15.7/400
15.7/399
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.
NECESSARY REQUIRED 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
LEGEND
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.
.
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.
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. 42 (1067)
. 36 (914)
CG
COND
MAT’L
—
—
—
Center of Gravity
Condenser
Material
NEC
REQ’D
—
—
National Electrical Code
Required
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. 42 (1067)
REQUIRED CLEARANCES FOR SERVICING — in. (mm)
NOTES:
Evaporator Coil Access Side
Control Box Access Side
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. 30 (762)
. 30 (762)
1. Clearances must be maintained to prevent recirculation of air from outdoor-fan dis-
.
.
charge.
(Except for Necessary Requirements)
2. Dimensions in ( ) are in millimeters.
Unit Top .
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. 36 (914)
. 30 (762)
Side Opposite Ducts
UNIT WT
CORNER WT (Lb/Kg)
UNIT
50SS
ELECTRICAL
CHARACTERISTICS
Lb
Kg
A
B
C
D
048
060
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
352
379
160
172
87/40
70/32
73/33
104/47
136/62
125/57
56/25
80/36
Fig. 5 — Dimensions; Units 50SS048,060 With Optional Base Rail
5
REQUIRED CLEARANCES TO COMBUSTIBLE MATERIAL — in. (mm)
LEGEND
NEC
REQ’D
Unit Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 (356)
Duct Side of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 (51)
Side Opposite Ducts . . . . . . . . . . . . . . . . . . . . . . . . 14 (356)
Bottom of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0
Vertical Discharge First 12 in. (305) of Supply Duct . . . . . . . 1 (25)
CG
COND
MAT’L
—
—
—
Center of Gravity
Condenser
Material
—
—
National Electrical Code
Required
NECESSARY REQUIRED CLEARANCES — in. (mm)
Between Units, Control Box Side . . . . . . . . . . . . . . . . 42 (1067)
Unit and Ungrounded Surfaces, Control Box Side . . . . . . 36 (914)
Unit and Block or Concrete Walls and Other Grounded
Surfaces, Control Box Side . . . . . . . . . . . . . . . . . . . 42 (1067)
REQUIRED CLEARANCES FOR SERVICING — in. (mm)
Evaporator Coil Access Side . . . . . . . . . . . . . . . . . . . 30 (762)
Control Box Access Side . . . . . . . . . . . . . . . . . . . . . . 30 (762)
(Except for Necessary Requirements)
Unit Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 (914)
Side Opposite Ducts . . . . . . . . . . . . . . . . . . . . . . . . 30 (762)
NOTES:
1. Clearances must be maintained to prevent recirculation of air from
outdoor-fan discharge.
2. Dimensions in ( ) are in millimeters.
CENTER OF GRAVITY (in./mm)
Y
UNIT
50SX
X
Z
024
030
036
21.7/552
21.9/556
20.8/528
20.7/527
20.7/525
20.0/507
12.7/321
12.7/321
12.7/321
UNIT WT
CORNER WT (Lb/Kg)
UNIT
50SX
ELECTRICAL
CHARACTERISTICS
Lb
Kg
A
B
C
D
024
030
036
208/230-1-60
208/230-1-60
208/230-1-60, 208/230-3-60, 460-3-60
270
273
291
123
124
132
67/30
66/30
80/36
62/28
64/29
54/25
99/45
100/45
112/51
42/19
43/20
45/20
Fig. 6 — Dimensions; Units 50SX024-036 Without Base Rail
6
REQUIRED CLEARANCES TO COMBUSTIBLE MATERIAL — in. (mm)
LEGEND
NEC
REQ’D
Unit Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 (356)
Duct Side of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 (51)
Side Opposite Ducts . . . . . . . . . . . . . . . . . . . . . . . . 14 (356)
Bottom of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0
Vertical Discharge First 12 in. (305) of Supply Duct . . . . . . . 1 (25)
CG
COND
MAT’L
—
—
—
Center of Gravity
Condenser
Material
—
—
National Electrical Code
Required
NECESSARY REQUIRED CLEARANCES — in. (mm)
Between Units, Control Box Side . . . . . . . . . . . . . . . . 42 (1067)
Unit and Ungrounded Surfaces, Control Box Side . . . . . . 36 (914)
Unit and Block or Concrete Walls and Other Grounded
Surfaces, Control Box Side . . . . . . . . . . . . . . . . . . . 42 (1067)
REQUIRED CLEARANCES FOR SERVICING — in. (mm)
Evaporator Coil Access Side . . . . . . . . . . . . . . . . . . . 30 (762)
Control Box Access Side . . . . . . . . . . . . . . . . . . . . . . 30 (762)
(Except for Necessary Requirements)
Unit Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 (914)
Side Opposite Ducts . . . . . . . . . . . . . . . . . . . . . . . . 30 (762)
NOTES:
1. Clearances must be maintained to prevent recirculation of air from
outdoor-fan discharge.
2. Dimensions in ( ) are in millimeters.
CENTER OF GRAVITY (in./mm)
Y
UNIT
50SX
X
Z
024
030
036
21.5/546
21.7/550
20.6/524
20.8/528
20.7/527
20.1/510
15.0/380
15.0/380
15.0/380
UNIT WT
CORNER WT (Lb/Kg)
UNIT
50SX
ELECTRICAL
CHARACTERISTICS
Lb
Kg
A
B
C
D
024
030
036
208/230-1-60
208/230-1-60
208/230-1-60, 208/230-3-60, 460-3-60
290
293
311
132
133
142
72/33
71/32
85/39
67/30
69/31
59/27
104/47
105/48
117/53
47/21
48/22
50/23
Fig. 7 — Dimensions; Units 50SX024-036 With Optional Base Rail
7
Fig. 8 — Dimensions; Units 50SX042-060 Without Base Rail
8
LEGEND
CG
COND
MAT’L
—
—
—
Center of Gravity
Condenser
Material
NEC
REQ’D
—
—
National Electrical Code
Required
REQUIRED CLEARANCES TO COMBUSTIBLE MATERIAL — in. (mm)
Unit Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 (356)
Duct Side of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 (51)
Side Opposite Ducts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 (356)
Bottom of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0
Vertical Discharge First 12 in. (305) of Supply Duct . . . . . . . . . . . 1 (25)
NECESSARY REQUIRED CLEARANCES — in. (mm)
Between Units, Control Box Side . . . . . . . . . . . . . . . . . . . . . 42 (1067)
Unit and Ungrounded Surfaces, Control Box Side . . . . . . . . . . . 36 (914)
Unit and Block or Concrete Walls and Other Grounded
Surfaces, Control Box Side . . . . . . . . . . . . . . . . . . . . . . . . . 42 (1067)
REQUIRED CLEARANCES FOR SERVICING — in. (mm)
Evaporator Coil Access Side . . . . . . . . . . . . . . . . . . . . . . . . . 30 (762)
Control Box Access Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 (762)
(Except for Necessary Requirements)
Unit Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 (914)
Side Opposite Ducts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 (762)
NOTES:
1. Clearances must be maintained to prevent recirculation of air from outdoor-
fan discharge.
2. Dimensions in ( ) are in millimeters.
CENTER OF GRAVITY (in./mm)
UNIT
50SX
X
Y
Z
042
048
060
21.0/533
21.8/553
22.2/565
20.1/510
19.7/499
19.8/503
15.4/390
15.4/390
13.4/340
UNIT WT
CORNER WT (Lb/Kg)
UNIT
50SX
ELECTRICAL
CHARACTERISTICS
Lb
Kg
A
B
C
D
042
048
060
208/230-1-60, 208/230-3-60, 460-3-60 309 140 84/38 59/27 119/54 47/21
208/230-1-60, 208/230-3-60, 460-3-60 340 155 84/38 70/32 133/60 53/24
208/230-1-60, 208/230-3-60
359 163 65/30 99/45 120/55 75/34
Fig. 8 — Dimensions; Units 50SX042-060 Without Base Rail (cont)
9
Fig. 9 — Dimensions; Units 50SX042-060 With Optional Base Rail
10
LEGEND
CG
COND
MAT’L
—
—
—
Center of Gravity
Condenser
Material
NEC
REQ’D
—
—
National Electrical Code
Required
REQUIRED CLEARANCES TO COMBUSTIBLE MATERIAL — in. (mm)
Unit Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 (356)
Duct Side of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 (51)
Side Opposite Ducts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 (356)
Bottom of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0
Vertical Discharge First 12 in. (305) of Supply Duct . . . . . . . . . . . 1 (25)
NECESSARY REQUIRED CLEARANCES — in. (mm)
Between Units, Control Box Side . . . . . . . . . . . . . . . . . . . . . 42 (1067)
Unit and Ungrounded Surfaces, Control Box Side . . . . . . . . . . . 36 (914)
Unit and Block or Concrete Walls and Other Grounded
Surfaces, Control Box Side . . . . . . . . . . . . . . . . . . . . . . . . . 42 (1067)
REQUIRED CLEARANCES FOR SERVICING — in. (mm)
Evaporator Coil Access Side . . . . . . . . . . . . . . . . . . . . . . . . . 30 (762)
Control Box Access Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 (762)
(Except for Necessary Requirements)
Unit Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 (914)
Side Opposite Ducts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 (762)
NOTES:
1. Clearances must be maintained to prevent recirculation of air from outdoor-
fan discharge.
2. Dimensions in ( ) are in millimeters.
CENTER OF GRAVITY (in./mm)
UNIT
50SX
X
Y
Z
042
048
060
20.8/529
21.6/548
22.0/560
20.2/512
19.8/502
19.9/506
17.3/440
17.3/440
15.7/399
UNIT WT
CORNER WT (Lb/Kg)
UNIT
50SX
ELECTRICAL
CHARACTERISTICS
Lb
Kg
A
B
C
D
042
048
060
208/230-1-60, 208/230-3-60, 460-3-60 329 150 89/40
208/230-1-60, 208/230-3-60, 460-3-60 360 164 89/40
64/29
75/34
124/56 52/24
138/63 58/26
208/230-1-60, 208/230-3-60
379 172 70/32 104/47 125/57 80/36
Fig. 9 — Dimensions; Units 50SX042-060 With Optional Base Rail (cont)
11
PART NUMBER
‘‘A’’
CPRFCURB001A00
CPRFCURB002A00
CPRFCURB003A00
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
12
RECEIVING AND INSTALLATION
Step 1 — Check Equipment
Do not restrict condenser airflow. An air restriction at
either the outdoor-air inlet or the fan discharge can be
detrimental to compressor life.
IDENTIFY UNIT — The unit model number and serial num-
ber are stamped on the unit identification plate. Check this
information against shipping papers.
Do not place the unit where water, ice, or snow from
an overhang or roof will damage or flood the unit. Do not
install the unit on carpeting, tile, or other combustible ma-
terials. The unit may be installed on wood flooring or on
Class A, B, or C roof covering materials.
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.
Step 4 — Rig and Place Unit — Use spreader bars
or crate top when rigging the unit. The units must be rigged
for lifting as shown in Fig. 11 and 12. Refer to Fig. 11 and
12 for rigging weights and Tables 1 and 2 for operating weights.
Use extreme caution to prevent damage when moving the
unit. Unit must remain in an upright position during all rig-
ging and moving operations. The unit must be level for proper
condensate drainage; the ground-level pad or accessory roof
curb must be level before setting the unit in place. When a
field-fabricated support is used, be sure that the support is
level and that it properly supports the unit.
Check all items against shipping list. Immediately notify
the nearest Carrier Air Conditioning office if any item is
missing.
To prevent loss or damage, leave all parts in original pack-
ages until installation.
Step 2 — Provide Unit Support
ROOF CURB — Install accessory roof curb in accordance
with instructions shipped with curb. See Fig. 10. Install in-
sulation, cant strips, roofing, and flashing. Ductwork must
be attached to curb.
UNITS WITHOUT BASE RAILS —Accessory rigging brack-
ets are recommended to be used for rigging. Install brackets
as follows:
IMPORTANT: The gasketing of the unit to the roof
curb is critical for a watertight seal. Install gasketing
material supplied with the roof curb. Improperly ap-
plied gasketing also can result in air leaks and poor
unit performance.
Secure screws and paint protectors solidly against unit
basepan to hold lifting brackets in position.
Never use lifting brackets when the temperature is be-
low −10 F (−23 C).
Never exceed 200 lbs per bracket of lifting force.
Never use lifting brackets for lifting other models of air
conditioning units.
Lifting point should be directly over the unit center of
gravity.
Curb should be level to within 1⁄4 inch. This is necessary
for unit drain to function properly. Refer to accessory roof
curb installation instructions for additional information as
required.
SLAB MOUNT — Place the unit on a solid, level concrete
pad that is a minimum of 4 in. thick with 2 in. above grade.
The slab should extend approximately 2 in. beyond the cas-
ing on all 4 sides of the unit. Install a 6-in. gravel apron in
front of condenser-air inlet to prevent obstruction of airflow
by grass or shrubs. Do not secure the unit to the slab except
when required by local codes.
1. Position brackets as close to the corners of unit as pos-
sible. Be sure brackets are well outside of center of grav-
ity. (See Fig. 2, 4, 6, 8, and 11.)
2. Position paint protectors and foam strips between screws
and painted surface of unit. Tighten screws until they make
contact with the paint protectors.
3. Secure device or hook of sufficient strength to hole in bracket
as shown in detail ‘‘A’’ of Fig. 11.
4. If wood top is available, use it for a spreader bar to pre-
vent straps from damaging unit. If wood top is not avail-
able, use spreader bars of sufficient length.
Step 3 — Provide Clearances — The required mini-
mum service clearances and clearances to combustibles are
shown in Fig. 2-9. Adequate ventilation and condenser air
must be provided.
The condenser fan pushes air through the condenser coil
and discharges it through louvers on the top cover, the deco-
rative grille, and the compressor access panel. Be sure that
the fan discharge does not recirculate to the condenser coil.
Do not locate the unit in either a corner or under an over-
head obstruction. The minimum clearance under a partial over-
hang (such as a normal house overhang) is 48 in. above the
unit top. The maximum horizontal extension of a partial over-
hang must not exceed 48 inches.
UNITS WITH OPTIONAL BASE RAILS — Keep unit up-
right and do not drop. Use spreader bars or top crate when
rigging unit. Rollers may be used to move unit across roof.
Level unit for proper condensate disposal. See Fig. 3, 5, 7,
and 9 for additional information. Lifting holes are provided
in base rails as shown in Fig. 12. Refer to rigging instruc-
tions on unit.
13
NOTICE TO RIGGERS
Hook rigging shackles through holes in lifting brackets, as shown in
Detail ‘‘A,’’ lifting brackets to be centered around the unit center of gravity. Use
wood top skid when rigging, to prevent rigging straps from damaging unit.
All panels must be in place when rigging.
SHIPPING WEIGHT
A
B
C
UNIT SIZE
50SS
Lb
Kg
in.
mm
in.
mm
in.
mm
018
024
030
036
042
048
060
260
289
306
322
333
384
411
118
131
139
146
151
174
186
363⁄4
363⁄4
363⁄4
363⁄4
363⁄4
363⁄4
363⁄4
934
934
934
934
934
934
934
18
457
426
415
412
416
412
412
241⁄8
241⁄8
241⁄8
241⁄8
281⁄8
341⁄8
341⁄8
613
613
613
613
714
867
867
163⁄4
165⁄16
161⁄4
167⁄16
161⁄4
161⁄4
SHIPPING WEIGHT
A
B
C
UNIT SIZE
50SX
Lb
Kg
in.
mm
in.
mm
in.
mm
024
030
036
042
048
060
322
325
343
361
392
411
146
147
155
164
178
186
363⁄4
363⁄4
363⁄4
363⁄4
363⁄4
363⁄4
934
934
934
934
934
934
143⁄4
141⁄2
155⁄8
151⁄2
1411⁄16
161⁄4
375
368
397
394
373
412
281⁄8
281⁄8
281⁄8
341⁄8
341⁄8
341⁄8
714
714
714
867
867
867
Fig. 11 — Suggested Rigging for Units Without 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 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.
SHIPPING
SHIPPING
A
B
C
UNIT SIZE
50SS
A
B
C
WEIGHT
UNIT SIZE
50SX
WEIGHT
Lb
Kg
in.
mm
in.
mm
in.
mm
Lb
Kg
in.
mm
in.
mm
in.
mm
018
024
030
036
042
048
060
247
276
293
309
339
371
398
112
125
133
140
154
168
180
36.5
36.5
36.8
36.5
36.5
36.5
36.5
926.0
926.0
926.0
926.0
926.0
926.0
926.0
17.0
14.3
14.7
15.5
15.5
14.8
14.4
431
364
372
393
394
376
366
28.2
28.2
28.2
28.2
32.2
38.2
38.2
715
715
715
715
817
969
969
024
030
036
042
048
060
309
312
330
348
379
398
140
141
150
158
172
180
36.5
36.5
36.5
36.5
36.5
36.5
926.0
926.0
926.0
926.0
926.0
926.0
15.0
14.8
15.8
15.6
14.9
14.4
380
376
402
397
378
366
32.2
32.2
32.2
38.2
38.2
38.2
817
817
817
969
969
969
Fig. 12 — Suggested Rigging for Units with Optional Base Rail
14
Table 1 — Physical Data — Unit 50SS
UNIT 50SS
018
024
030
036
R-22
Acutrol™ System
4.30
042
048
060
REFRIGERANT
Metering Device
Charge (lb)
2.60
2.75
3.40
5.20
6.50
7.00
OPERATING WEIGHT (lb)
Without Base Rails
With Optional Base Rails
208
228
237
257
254
274
270
290
300
320
332
352
359
379
COMPRESSOR TYPE
Rotary
Reciprocating
Reciprocating
Reciprocating
Reciprocating
Scroll
Scroll
EVAPORATOR FAN
Speeds
Nominal Rpm
Diameter (in.)
Width (in.)
Nominal Airflow (Cfm)
Motor Hp
Centrifugal — Direct Drive
3
2
825
10
9
3
1075
10
3
2
1100
10
2
1100
10
2
1100
10
1100
10
1100
10
9
9
9
9
9
9
600
800
1000
1200
1400
1600
1995
1
1
1
1
1
3
3
⁄
4
⁄
4
⁄
2
⁄
2
⁄
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
3.06
3...15
3.60
3...15
4.44
4...15
4.44
CONDENSER FAN
Cfm
Nominal Rpm
Diameter (in.)
Motor Hp
Propeller — Direct Drive
1700
850
1700
850
1900
1050
1900
1050
1900
1050
2400
1050
2400
1050
18
18
18
18
18
20
20
1
1
1
1
1
1
1
⁄
8
⁄
8
⁄
4
⁄
4
⁄
4
⁄
3
⁄
3
CONDENSER COIL
Rows...Fins/in.
Face Area (sq ft)
1...17
5.95
1...17
5.95
2...17
5.95
2...17
5.95
2...17
7.00
2...17
8.66
2...17
8.66
FILTER SIZE (in.)*
Throwaway
20x20
20x20
20x24
20x24
24x24
24x30
24x30
*Recommended field-supplied filters are 1 in. thick.
Table 2 — Physical Data — Unit 50SX
UNIT 50SX
024
030
036
042
048
060
REFRIGERANT
Metering Device
Charge (lb)
R-22
Acutrol™ System
5.7
3.9
4.5
5.4
5.8
6.5
OPERATING WEIGHT (lb)
Without Base Rails
With Optional Base Rails
270
290
273
293
291
311
309
329
340
360
359
379
COMPRESSOR TYPE
Scroll
EVAPORATOR FAN
Motor Type
Centrifugal — Direct Drive
Std
3
Std
3
Std
3
Std
3
Std*
ICM
Variable
—
ICM
Speeds
2
1125
10
Variable
Nominal Rpm
Diameter (in.)
Width (in.)
Nominal Airflow (Cfm)
Motor Hp
1075
10
1075
10
1100
10
1100
10
—
10
9
1995
1
10
9
9
9
9
9
9
1600
1
800
1000
1200
1400
1600
1
1
1
1
3
⁄
4
⁄
4
⁄
2
⁄
2
⁄
4
EVAPORATOR COIL
Rows...Fins/in.
Face Area (sq ft)
2...15
3.60
3...15
2.70
4...15
3.60
3...15
4.44
4...15
4.44
4...15
4.44
CONDENSER FAN
Cfm
Nominal Rpm
Diameter (in.)
Motor Hp
Propeller — Direct Drive
2200
1100
2200
1100
2200
1100
2400
1100
2400
1100
2400
1050
20
20
20
20
20
20
1
1
1
1
1
1
⁄
4
⁄
4
⁄
4
⁄
4
⁄
4
⁄
3
CONDENSER COIL
Rows...Fins/in.
Face Area (sq ft)
2...17
7.00
2...17
7.00
2...17
7.00
2...17
8.66
2...17
8.66
2...17
8.66
FILTER SIZE (in.)†
Throwaway
24x24
24x24
24x24
24x30
24x30
24 x 30
LEGEND
ICM
*460 v only.
†Recommended field-supplied filters are 1 in. thick.
NOTE: Standard motors are non-integrated control motors.
—
Integrated Control Motor
15
andAir Conditioning ContractorsAssociation (ACCA) mini-
mum installation standards for residential heating and air
conditioning systems.
• Secure all ducts to building structure. Flash, weather-
proof, and vibration-isolate duct openings in wall or roof
according to good construction practices.
Step 5 — Select and Install Ductwork — The de-
sign and installation of the duct system must be in accor-
dance with the standards of the NFPA (National Fire Protec-
tion Association) for installation of nonresidence-type air
conditioning and ventilating systems, NFPA90Aor residence-
type,NFPA90B;and/orlocalcodesandresidence-type,NFPA90B;
and/or local codes and ordinances.
Select and size ductwork, supply-air registers and
return-air grilles according to ASHRAE (American Society
of Heating, Refrigeration, and Air Conditioning Engineers)
recommendations.
Figure 14 shows a typical duct system with 50SS,SX
installed.
The unit has duct flanges on the supply- and return-air
openings on the side of the unit. See Fig. 2-9 for connection
sizes and locations.
When designing and installing ductwork, consider the
following:
When connecting ductwork to units, do not drill deeper
than 1⁄2 inch in shaded area shown in Fig. 13 or coil may
be damaged.
*Separate disconnect per NEC
(National Electrical Code) required
for electric heater when single-
point connection is not used.
Power Wiring
Control Wiring
Condenser Airflow
Evaporator Airflow
Fig. 14 — Typical Installation
Table 3 — Minimum Airflow for Safe Electric
Heater Operation (Cfm)
Fig. 13 — Area Not To Be Drilled
SIZE
018*
024
030
036
042
048
060
700
700
875
1200
1225
1400
1750
*Unit 50SS only.
• All units should have field-supplied filters or accessory fil-
ter rack installed in the return-air side of the unit. Rec-
ommended sizes for filters are shown in Tables 1 and 2.
CONVERTING HORIZONTAL DISCHARGE UNITS TO
DOWNFLOW (VERTICAL) DISCHARGE — STD (Non-
Integrated Control Motor [Non-ICM] UNITS — Units are
shipped in a horizontal configuration. To convert a horizon-
tal unit for downflow (vertical) discharge, perform the fol-
lowing steps:
• Avoid abrupt duct size increases and reductions. Abrupt
change in duct size adversely affects air performance.
IMPORTANT: Use flexible connectors between
ductwork and unit to prevent transmission of vibra-
tion. Use suitable gaskets to ensure weathertight and
airtight seal. When electric heat is installed, use fire-
proof canvas (or similar heat resistant material) con-
nector between ductwork and unit discharge connec-
tion. If flexible duct is used, insert a sheet metal sleeve
inside duct. Heat resistant duct connector (or sheet metal
sleeve) should extend 24-in. from electric heater
element.
Before performing service or maintenance operations on
system, turn off main power to unit. Turn off accessory
heater power switch if applicable. Electrical shock can
cause personal injury.
1. Open all electrical disconnects before starting any serv-
ice work.
2. Remove evaporator coil access panel (Fig. 15).
• Size ductwork for cooling air quantity (cfm). The mini-
mum air quantity for proper electric heater operation is
listed in Table 3. Heater limit switches may trip at air quan-
tities below those recommended.
3. Locate lances in basepan insulation that are placed over
the perimeter of the vertical duct opening cover
(Fig. 16).
4. Using a straight edge and sharp knife, cut and remove
the insulation around the perimeter of the cover. Re-
move the screws securing the cover to the basepan and
slide out the cover. Discard the cover (Fig. 17).
• Insulate and weatherproof all external ductwork. Insulate
and cover with a vapor barrier all ductwork passing through
conditioned spaces. Follow latest Sheet Metal and Air Con-
ditioning Contractors National Association (SMACNA)
16
ACCESS PANEL
(REMOVE SCREWS)
Fig. 15 — Evaporator Coil Access Panel
Fig. 16 — Basepan Insulation Over
Vertical Duct Opening
5. Remove indoor blower access panel (Fig. 18).
6. Disconnect evaporator-fan motor leads from evaporator-
fan relay and unit contactor. Carefully disengage wire
tie containing evaporator-fan motor leads from the unit
control box (Fig. 19).
7. Remove screws (Fig. 20) securing evaporator blower hous-
ing to blower shelf and carefully slide out blower hous-
ing. There is a filler bracket attached to the blower shelf;
remove this filler bracket and retain for later use.
8. Locate lances in basepan insulation that are placed over
the perimeter of the vertical discharge opening cover
(Fig. 21).
9. Using a straight edge and sharp knife, cut the insulation
around the perimeter of the cover. Remove the screws
securing the cover to the basepan and slide out the cover
(Fig. 22). Discard the cover. Install filler bracket re-
moved in Step 7.
Fig. 17 — Insulation and Cover Removed
from Vertical Duct Opening
10. If unit ductwork is to be attached to vertical opening
flanges on the unit basepan (jackstand applications only),
do so at this time.
Secure using screw removed in Step 7. Reconnect
evaporator-fan motor leads and insert wire tie back into
unit control box (Fig. 19).
11. It is recommended that the basepan insulation around
the perimeter of the vertical opening be secured to the
basepan with aluminum tape to prevent the insulation
from tearing or bunching up when the blower housing is
installed in the vertical discharge position.
13. Cover the horizontal duct openings. Duct covers can be
ordered as an accessory or be field-fabricated as shown
in Fig. 23.
14. Reinstall the evaporator coil and indoor blower access
panels.
12. Orient blower housing for vertical airflow (blower mo-
tor adjacent to horizontal duct opening) and slide into
vertical opening making sure the flanges on the blower
side plates engage the tabs in the unit basepan.
15. After completing unit installation, perform all safety checks
and power up unit.
Resistance will be felt as the blower housing contacts
the basepan insulation; this can be overcome by apply-
ing a slight force to the base of the blower. Continue
sliding blower in until hole in side plate flange aligns
with the hole in the basepan.
17
Fig. 21 — Basepan Insulation Over
Vertical Discharge Opening
INDOOR BLOWER ACCESS PANEL
(REMOVE SCREWS)
Fig. 18 — Indoor Blower Access Panel
WIRE TIE CONTACTOR
RELAY
Fig. 22 — Insulation and Cover Removed
from Vertical Discharge Opening
CONVERTING HORIZONTAL DISCHARGE UNITS TO
DOWNFLOW (VERTICAL) DISCHARGE — ICM (Inte-
grated Control Motor) UNITS — Units are shipped in a hori-
zontal configuration. To convert a horizontal unit for down-
flow (vertical) discharge, perform the following steps:
Fig. 19 — Fan Motor Leads
Before performing service or maintenance operations on
system, turn off main power to unit. Turn off accessory
heater power switch if applicable. Electrical shock can
cause personal injury.
1. Open all electrical disconnects before starting any serv-
ice work.
2. Remove evaporator coil access panel (Fig. 15).
3. Locate lances in basepan insulation that are placed over
the perimeter of the vertical duct opening cover
(Fig. 16).
4. Using a straight edge and sharp knife, cut and remove
the insulation around the perimeter of the cover. Re-
move the screws securing the cover to the basepan and
slide out the cover. Discard the cover (Fig. 17).
5. Remove evaporator blower access panel (Fig. 18).
6. Remove screws (Fig. 20) securing evaporator blower hous-
ing to blower shelf and carefully slide out blower hous-
ing. Disconnect the plug assemblies (Fig. 24) from the
evaporator-fan motor. There is a filler bracket attached
to the blower shelf; remove this filler bracket and retain
for later use. (See Fig. 24).
Fig. 20 — Blower Shelf and Housing
18
7. Remove screws securing blower shelf to duct panel. Dis-
card the blower shelf.
8. Locate lances in basepan insulation that are placed over
the perimeter of the vertical discharge opening cover
(Fig. 21).
13. Orient blower housing for vertical airflow (blower mo-
tor adjacent to horizontal duct opening). See Fig. 25.
Reconnect the plug assemblies. Slide blower housing into
vertical opening making sure the flanges on the blower
side plates engage the tabs in the unit basepan.
Resistance will be felt as the blower housing contacts
the basepan insulation; this can be overcome by apply-
ing a slight force to the base of the blower. Continue
sliding blower in until hole in side plate flange aligns
with the hole in the basepan. Secure using screws re-
moved in Step 6.
9. Using a straight edge and sharp knife, cut the insulation
around the perimeter of the cover. Remove the screws
securing the cover to the basepan and slide out the cover
(Fig. 22). Discard the cover. Install filler bracket re-
moved in Step 6.
10. If unit ductwork is to be attached to vertical opening
flanges on the unit basepan (jackstand applications only),
do so at this time.
11. It is recommended that the basepan insulation around
the perimeter of the vertical opening be secured to the
basepan with aluminum tape to prevent the insulation
from tearing or bunching up when the blower housing is
installed in the vertical discharge position.
14. Reinstall the high-voltage raceway removed in Step 12.
15. Cover the horizontal duct openings. Duct covers can be
ordered as an accessory or be field-fabricated.
16. Reinstall the evaporator coil and evaporator blower ac-
cess panels.
17. After completing unit installation, perform all safety checks
and power up unit.
12. Remove screws securing the high-voltage raceway to duct
panel. See Fig. 24. Temporarily place raceway on top of
unit until blower housing is installed.
NOTES:
1. An accessory duct cover is available as an alternative to field
fabrication.
2. Construct duct cover out of 22-gage sheet metal.
3. Dimensions in ( ) are in millimeters.
Fig. 23 — Field-Fabricated Duct Cover
19
4. See the following caution. Using remaining holes in duct
flanges as templates, drill the remaining holes with the
no. 26 (.147-in.) drill.
BLOWER
SHELF
Do not drill deeper than 1⁄2-in. into shaded area shown
in Fig. 26. Damage to refrigerant coil could result.
FILLER
BRACKET
5. Fully secure the duct flanges using the remaining screws
provided.
RACEWAY
The finished kit installation accommodates a 143⁄4-in. x
143⁄4-in. duct.
PLUG ASSEMBLIES
Fig. 24 — Filler Bracket and Blower Shelf
1
NOTE: Do not drill more than
⁄
2-in. deep in shaded area.
Fig. 26 — Duct Flange Kit — Locating Holes
(Typical)
Step 6 — Provide for Condensate Disposal
NOTE: Be sure that condensate-water disposal methods com-
ply with local codes, restrictions, and practices.
3
Unit disposes of condensate through a ⁄4-in. NPT fitting
which exits through the compressor access panel. See
Fig. 2-9 for location of condensate connection.
Condensate water can be drained directly onto the roof in
rooftop installations (where permitted) or onto a gravel apron
in ground-level installations. Install a field-supplied conden-
sate trap at end of condensate connection to ensure proper
drainage. Make sure that the outlet of the trap is at least
1 in. lower than the drain-pan condensate connection to pre-
vent the pan from overflowing. See Fig. 27. Prime the trap
with water. When using a gravel apron, make sure it slopes
away from the unit.
HORIZONTAL DUCT OPENING
Fig. 25 — Housing Placed for Vertical Airflow
ACCESSORY DUCT FLANGE KIT INSTALLATION —
Refer to Fig. 26 for duct adapter dimensions and hole
locations.
1. Mark hole locations shown in Fig. 26.
2. At marked locations, drill holes using a no. 26 (.147-in.)
twist drill.
If the installation requires draining the condensate water
3
away from the unit, install a 2-in. trap using a ⁄4-in. FPT
connection. See Fig. 27. Make sure that the outlet of the trap
is at least 1 in. lower than the unit drain-pan condensate con-
nection to prevent the pan from overflowing. Prime the trap
with water. Connect a drain tube using a minimum of 3⁄4-in.
PVC, 3⁄4-in. CPVC, or 3⁄4-in. copper pipe (all field supplied).
Do not undersize the tube. Pitch the drain tube downward at
a slope of at least 1 in. for every 10 ft of horizontal run. Be
sure to check the drain tube for leaks. Prime trap at the be-
ginning of the cooling season start-up.
3. Partially secure duct flanges using two of the no. 10,1⁄2-in.
screws provided.
20
HIGH-VOLTAGE CONNECTIONS — The unit must have
a separate electrical service with a field-supplied, water-
proof disconnect switch mounted at, or within sight from the
unit. Refer to the unit rating plate for maximum fuse/circuit
breaker size and minimum circuit amps (ampacity) for wire
sizing. See Tables 4A and 4B for electrical data.
The field-supplied disconnect may be mounted on the unit
over the high-voltage inlet hole. See Fig. 2-9.
If the unit has an electric heater, a second disconnect may
be required. Consult the Installation, Start-Up and Service
Instructions provided with the accessory for electrical serv-
ice connections.
Fig. 27 — Condensate Trap
Step 7 — Install Electrical Connections
Operation of unit on improper line voltage constitutes
abuse and may cause unit damage that could affect
warranty.
The unit cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of personal
injury if an electrical fault should occur. This ground
may consist of an electrical wire connected to the unit
wire-binding screw in the control compartment, or con-
duit approved for electrical ground when installed in ac-
cordance with NEC (National Electrical Code), ANSI/
NFPA (latest edition) (in Canada, Canadian Electrical
Code CSA C22.1) and local electrical codes. Failure to
adhere to this warning could result in personal injury or
death.
ROUTING POWER LEADS INTO UNIT — Use only cop-
per wire between disconnect and unit. The high-voltage leads
should be in a conduit until they enter the duct panel; con-
duit termination at the duct panel must be watertight. Run
the high-voltage leads through the knockout on the duct panel
(see Fig. 28 for location and size). When the leads are inside
the unit, run leads up the high-voltage raceway to the line
wiring splice box (Fig. 29). For single-phase units, connect
leads to the black and yellow wires; for 3-phase units,
connect the leads to the black, yellow, and blue wires (see
Fig. 30).
CONNECTING GROUND LEAD TO WIRE-BINDING
SCREW — Refer to Fig. 29 and 30. Connect the ground
lead to the chassis using the wire-binding screw in the wir-
ing splice box.
Failure to follow these precautions could result in dam-
age to the unit being installed:
ROUTING CONTROL POWER WIRES — STD NON-
ICM UNITS (24 v) — For all units except 50SS060, form
a drip-loop with the thermostat leads before routing them
into the unit. Route the thermostat leads through grommeted
hole provided in unit (see Fig. 28) into unit control power
splice box. Connect thermostat leads to unit control power
leads as shown in Fig. 31.
1. Make all electrical connections in accordance with
NEC ANSI/NFPA (latest edition) and local elec-
trical codes governing such wiring. In Canada, all
electrical connections must be in accordance with CSA
Standard C22.1 Canadian Electrical Code Part 1
and applicable local codes. Refer to unit wiring
diagram.
For 50SS060 units, remove knockout in the duct panel (see
Fig. 28).
Remove the rubber grommet from the installer’s packet
(included with unit) and install it in the knockout opening.
Route thermostat wires through grommet providing a drip
loop at the panel. Connect low-voltage leads to the thermo-
stat as shown in Fig. 31.
The unit transformer supplies 24-v power for complete
system including accessory electrical heater. Transformer is
factory wired for 230-v operation. If supply voltage is 208 v,
rewire transformer primary as described in the Special Pro-
cedures for 208-v Operation section on page 24.
2. Use only copper conductor for connections between
field-supplied electrical disconnect switch and unit.
DO NOT USE ALUMINUM WIRE.
3. Be sure that high-voltage power to unit is within op-
erating voltage range indicated on unit rating plate.
On 3-phase units, ensure that phases are balanced within
2%. Consult local power company for correction of
improper voltage and/or phase imbalance.
4. Insulate low-voltage wires for highest voltage con-
tained within conduit when low-voltage control wires
are run in same conduit as high-voltage wires.
5. Do not damage internal components when drilling
through any panel to mount electrical hardware, con-
duit, etc.
21
Table 4A — Electrical Data — 50SS Units
OUTDOOR- INDOOR-
AWG 60C
MIN WIRE
SIZE
VOLTAGE RANGE COMPRESSOR
FAN
FAN
POWER SUPPLY
UNIT SIZE
50SS
MAX WIRE
LENGTH (ft)
V-PH-Hz
MOTOR
MOTOR
Min
187
187
187
187
187
187
414
187
187
414
187
187
187
187
414
414
187
187
187
187
414
414
Max
253
253
253
253
253
253
506
253
253
506
253
253
253
253
506
506
253
253
253
253
506
506
RLA
8.3
LRA
45.0
61.0
82.0
65.5
96.0
75.0
40.0
104.0
91.0
42.0
124.0
129.0
93.0
99.0
125.0
123.0
165.0
169.0
46.5
49.5
66.5
62.0
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
2.1
2.1
2.1
2.1
1.1
1.1
1.1
1.1
FLA
1.8
2.0
2.3
2.3
2.8
2.8
1.4
4.0
4.0
2.0
5.0
5.0
5.0
5.0
6.8
6.8
6.8
6.8
2.3
2.3
3.2
3.2
MCA
12.0
18.2
21.8
15.5
26.7
18.8
9.2
MOCP*
15
30
30
25
40
30
10
50
35
15
60
60
35
40
40
50
60
60
15
20
20
25
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
100
80
030
18.0
11.7
5.6
90
036
65
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
23.1
25.9
33.0
33.0
49.0
49.0
11.4
13.7
16.8
16.8
042
048
10
14
6
100
100
100
75
208/230-1-60†
208/230-1-60**
208/230-3-60†
208/230-3-60**
460-3-60†
21.8
26.4
12.8
15.0
16.0
19.3
28.9
32.1
6.4
6
10
10
8
75
90
460-3-60**
8
90
208/230-1-60†
208/230-1-60**
208/230-3-60†
208/230-3-60**
460-3-60†
6
100
100
100
100
100
100
6
14
14
12
12
060
8.2
8.0
460-3-60**
10.0
EXAMPLE: Supply voltage is 460-3-60.
LEGEND
AB = 452 v
BC = 464 v
AC = 455 v
AWG
BRKR
CUL
—
—
—
—
—
American Wire Gage
Breaker
Canadian Underwriters’ Laboratories
Full Load Amps
Heating, Air Conditioning and
Refrigeration
Locked Rotor Amps
452 + 464 + 455
FLA
Average Voltage =
=
3
HACR
1371
3
LRA
—
—
—
—
—
MCA
MOCP
NEC
RLA
Minimum Circuit Amps
Maximum Overcurrent Protection
National Electrical Code
Rated Load Amps
= 457
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
*Fuse or HACR Breaker.
†Carrier Scroll Compressor.
**Copeland Scroll Compressor.
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
NOTES:
7
457
% Voltage Imbalance = 100 x
1. In compliance with NEC requirements for multimotor and combi-
nation load equipment (refer to NEC Articles 430 and 440), the
overcurrent protective device for the unit shall be fuse or HACR
breaker. The CUL units may be fuse or circuit breaker.
2. Minimum wire size is based on 60 C copper wire. If other than
60 C wire is used, or if length exceeds wire length in table, de-
termine size from NEC.
= 1.53%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
3. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply volt-
age is greater than 2%. Use the following formula to determine
the percentage of voltage imbalance.
% Voltage Imbalance
max voltage deviation from average voltage
= 100 x
average voltage
22
Table 4B — Electrical Data — 50SX Units
OUTDOOR- INDOOR-
AWG 60C
MIN WIRE
SIZE
VOLTAGE RANGE COMPRESSOR
FAN
FAN
POWER SUPPLY
UNIT SIZE
50SX
MAX WIRE
LENGTH (ft)
V-PH-Hz
MOTOR
MOTOR
Min
187
187
187
187
414
187
187
414
187
187
414
187
187
Max
253
253
253
253
506
253
253
506
253
253
506
253
253
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
FLA
1.4
1.4
1.4
1.4
0.8
1.4
1.4
0.8
1.4
1.4
0.8
2.1
2.1
FLA
2.0
2.6
2.8
2.8
1.4
3.1
3.1
1.6
7.2
7.2
2.3
7.2
7.2
MCA
19.5
22.8
25.1
17.8
9.0
MOCP*
30
024
030
208/230-1-60
208/230-1-60
208/230-1-60
208/230-3-60
460-3-60
12
10
10
12
14
10
10
14
6
75
100
95
30
30
036
042
25
70
10
100
80
208/230-1-60
208/230-3-60
460-3-60
20.0
13.9
6.8
29.5
21.9
10.9
41.6
27.4
13.4
49.4
33.4
45
30
60
15
100
100
70
208/230-1-60
208/230-3-60
460-3-60
26.4
15.0
8.2
60
048
060
40
10
14
6
20
100
100
90
208/230-1-60
208/230-3-60
32.1
19.3
60
50
8
EXAMPLE: Supply voltage is 460-3-60.
LEGEND
AB = 452 v
BC = 464 v
AC = 455 v
AWG
BRKR
CUL
—
—
—
—
—
American Wire Gage
Breaker
Canadian Underwriters’ Laboratories
Full Load Amps
Heating, Air Conditioning and
Refrigeration
Locked Rotor Amps
452 + 464 + 455
FLA
Average Voltage =
=
3
HACR
1371
3
LRA
—
—
—
—
—
MCA
MOCP
NEC
RLA
Minimum Circuit Amps
Maximum Overcurrent Protection
National Electrical Code
Rated Load Amps
= 457
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
*Fuse or HACR Breaker.
†Carrier Scroll Compressor.
**Copeland Scroll Compressor.
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
NOTES:
7
457
% Voltage Imbalance = 100 x
1. In compliance with NEC requirements for multimotor and combi-
nation load equipment (refer to NEC Articles 430 and 440), the
overcurrent protective device for the unit shall be fuse or HACR
breaker. The CUL units may be fuse or circuit breaker.
2. Minimum wire size is based on 60 C copper wire. If other than
60 C wire is used, or if length exceeds wire length in table, de-
termine size from NEC.
= 1.53%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
3. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply volt-
age is greater than 2%. Use the following formula to determine
the percentage of voltage imbalance.
% Voltage Imbalance
max voltage deviation from average voltage
= 100 x
average voltage
23
ROUTING CONTROL POWER WIRES — ICM UNITS
(24 v) — Remove knockout in the duct panel (see Fig. 28).
Remove the rubber grommet from the installer’s packet (in-
cluded with unit) and install it in the knockout opening. Route
thermostat wires through grommet providing a drip loop at
the panel. Connect low-voltage leads to the thermostat as
shown in Fig. 31-34.
SPECIAL PROCEDURES FOR 208-V OPERATION
Make sure that the power supply to the unit is switched
OFF before making any wiring changes. Electrical shock
can cause personal injury or death.
The Easy Select interface board is located in the return-air
section and is attached to the duct panel. The Easy Select
interface board is factory wired to the motor and factory de-
fault selections are preset.
1. Disconnect the orange transformer-primary lead from the
contactor. See unit wiring label.
2. Remove the wirenut from the terminal on the end of the
red transformer-primary lead.
HIGH
VOLTAGE
POWER
ENTRY
3. Save the wirenut.
(KNOCKOUT)
4. Connect the red lead to the contactor terminal from which
the orange lead was disconnected.
2″ DIA.
1 1/8″ DIA.
1 3/8″ DIA.
2″ DIA.
5. Using the wirenut removed from the red lead, insulate
the loose terminal on the orange lead.
6. Wrap the wirenut with electrical tape so that the metal
terminal cannot be seen.
7/8″ DIA.
CONTROL
POWER
ENTRY*
Indoor blower-motor speeds may need to be changed for
208-v operation. Refer to Indoor Airflow and Airflow Ad-
justments section on page 34.
*Knockout on rectangular-duct panel units; entry hole on round-duct
panel units.
NOTE: For rectangular duct knockout sizes, see Fig. 2-9.
Fig. 28 — Typical Duct Panel Knockouts
UNIT POWER
LEAD
UNIT LINE WIRE
SPLICE BOX
WIRE-BINDING
SCREW
Field Wiring
Splice Connections
NEC — National Electrical Code
NOTE: Use copper wire only.
Fig. 30 — Line Power Connections
Fig. 31 — Control Connections
CONTROL POWER
SPLICE BOX
Fig. 29 — Wiring Splice Boxes
24
LEGEND
IFO
JW
—
—
Indoor Fan On
Jumper Wire
Fig. 32 — Easy Select Interface Board
LEGEND
C
—
—
—
—
—
—
—
—
—
Contactor, Compressor
Common
Terminal (Unmarked)
Terminal Block
Splice
COM
CTD
FU
Compressor Time Delay
Fuse
HR
Heater Relay
Integrated Control Motor
Indoor Fan On
Plug
ICM
IFO
PL
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To Represent Common Potential Only.
Not to Represent Wiring
TRAN
Transformer
Field Splice
Terminal (Marked)
Fig. 33 — Units 50SX048,060 — 208/230-1-60, Integrated Control Motor Wiring Schematic
25
LEGEND
C
—
—
—
—
—
—
—
—
—
Contactor, Compressor
Terminal (Unmarked)
Terminal Block
Splice
COM
CTD
FU
Common
Compressor Time Delay
Fuse
HR
Heater Relay
Integrated Control Motor
Indoor Fan On
Plug
ICM
IFO
PL
Factory Wiring
Field Control Wiring
Field Power Wiring
TRAN
Transformer
Field Splice
Accessory or Optional Wiring
To Indicate Common Potential Only.
Not to Represent Wiring
Terminal (Marked)
Fig. 34 — Unit 50SX048,060 — 208/230-3-60 Integrated Control Motor Wiring Schematic
PRE-START-UP
Use the Start-Up Checklist supplied at the end of this book
and proceed as follows to inspect and prepare the unit for
initial start-up:
Failure to observe the following warnings could result
in serious personal injury:
1. Remove all access panels.
1. Follow recognized safety practices and wear protec-
tive goggles when checking or servicing refrigerant
system.
2. Do not operate compressor or provide any electric
power to unit unless compressor terminal cover is in
place and secured.
3. Do not remove compressor terminal cover until all
electrical sources are disconnected.
4. Relieve all pressure from both high- and low-
pressure sides of the system before touching or dis-
turbing anything inside terminal box if refrigerant leak
is suspected around compressor terminals. Use ac-
cepted methods to recover refrigerant.
5. Never attempt to repair soldered connection while re-
frigerant system is under pressure.
6. Do not use torch to remove any component. System
contains oil and refrigerant under pressure. To re-
move a component, wear protective goggles and pro-
ceed as follows:
2. Read and follow instructions on all WARNING, CAU-
TION, and INFORMATION labels attached to, or shipped
with, unit.
Make the following inspections:
a. Inspect for shipping and handling damages such as bro-
ken lines, loose parts, disconnected wires, etc.
b. Inspect for oil at all refrigerant tubing connections and
on unit base. Detecting oil generally indicates a re-
frigerant leak. Leak-test all refrigerant tubing connec-
tions using electronic leak detector, or liquid-soap so-
lution. If a refrigerant leak is detected, see following
Check for Refrigerant Leaks section.
c. Inspect all field- and factory-wiring connections. Be
sure that connections are completed and tight.
d. Inspect coil fins. If damaged during shipping and han-
dling, carefully straighten fins with a fin comb.
3. Verify the following conditions:
a. Shut off electrical power to unit.
b. Relieve all pressure from system using both high-
and low-pressure ports. Use accepted methods to
recover refrigerant.
a. Make sure that outdoor-fan blade is correctly posi-
tioned in fan orifice. Leading edge of blade should be
1
2 in. back from condenser inlet grille or ⁄2 in. maxi-
mum from fan deck.
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.
b. Make sure that air filter(s) is in place.
c. Make sure that condensate drain pan and trap are filled
with water to ensure proper drainage.
d. Make sure that all tools and miscellaneous loose parts
have been removed.
26
4. If the unit is equipped with a crankcase heater, start the
heater 24 hours before starting the unit. To start the heater
only, turn the thermostat to the OFF position and ener-
gize the electrical disconnect to the unit.
3. When using an automatic changeover room thermostat,
place both SYSTEM and FAN switches in AUTO. posi-
tions. Observe that unit operates in Cooling mode when
temperature control is set to ‘‘call for cooling’’ (below
room temperature).
START-UP
IMPORTANT: Three-phase, scroll compressors in
the 50SS048,060 and 50SX036-060 units are
direction-oriented. These units must be checked to
ensure proper compressor 3-phase power lead ori-
entation. If not corrected within 5 minutes, the in-
ternal protector will shut off the compressor. The
3-phase power leads to the unit must be reversed to
correct rotation. When turning backwards, scroll com-
pressors emit elevated noise levels, and the differ-
ence between compressor suction and discharge
pressures may be dramatically lower than normal.
Use the Start-Up Checklist supplied at the end of this book,
and proceed as follows:
Check for Refrigerant Leaks — Locate and repair
refrigerant leaks and charge the unit as follows:
1. Using both high- and low-pressure ports, locate leaks and
reclaim remaining refrigerant to relieve system
pressure.
2. Repair leak following accepted practices.
NOTE: Install a filter drier whenever the system has been
opened for repair.
CHECKINGANDADJUSTING REFRIGERANT CHARGE
— The refrigerant system is fully charged with R-22 refrig-
erant, and is tested and factory sealed.
3. Check system for leaks using an approved method.
NOTE: Adjustment of the refrigerant charge is not required
unless the unit is suspected of not having the proper R-22
charge.
A superheat charging label is attached to the outside of
the compressor access door. The label includes a ‘‘Superheat
Charging Table’’ and a ‘‘Required Suction-Tube Tempera-
ture (F)’’ chart.
4. Evacuate refrigerant system and reclaim refrigerant if no
additional leaks are found.
5. Charge unit with R-22 refrigerant, using a volumetric-
charging cylinder or accurate scale. Refer to unit rating
plate for required charge. Be sure to add extra refrigerant
to compensate for internal volume of filter drier.
Start-Up Cooling Section and Make
Adjustments
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.
Complete the required procedures given in the Pre-
Start-Up section page 25 before starting the unit.
Do not jumper any safety devices when operating the
unit.
Do not operate the compressor when the outdoor tem-
perature is below 40 F (unless accessory low-ambient
kit is installed).
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.
Do not rapid-cycle the compressor. Allow 5 minutes be-
tween ‘‘on’’ cycles to prevent compressor damage.
Proceed as follows:
1. Remove caps from low- and high-pressure service
fittings.
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.
2. Using hoses with valve core depressors, attach low- and
high-pressure gage hoses to low- and high-pressure serv-
ice fittings, respectively.
3. Start unit in cooling mode and let unit run until system
pressures stabilize.
4. Measure and record the following:
a. Outdoor ambient-air temperature (F db).
b. Evaporator inlet-air temperature (F wb).
27
c. Suction-tube temperature (F) at low-side service
fitting.
d. Suction (low-side) pressure (psig).
7. Compare actual suction-tube temperature with proper
suction-tube temperature. Using a tolerance of ±3° F, add
refrigerant if actual temperature is more than 3° F higher
than proper suction-tube temperature, or remove refrig-
erant if actual temperature is more than 3° F lower than
required suction-tube temperature.
NOTE: If the problem causing the inaccurate readings is a
refrigerant leak, refer to Check for Refrigerant Leaks sec-
tion on page 27.
5. Using ‘‘Superheat Charging Table,’’ compare outdoor-air
temperature (F db) with evaporator inlet-air temperature
(F wb) to determine desired system operating superheat
temperature. See Tables 5A-5I and 6A-6F.
6. Using ‘‘Required Suction-Tube Temperature (F)’’
table, compare desired superheat temperature with suc-
tion (low-side) operating pressure (psig) to determine proper
suction-tube temperature. See Table 7.
Table 5A — Superheat Charging Table, 50SS018
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
70
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
75
80
85
90
95
100
105
110
115
*
*
*
6.7
*
*
*
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
LEGEND
Ewb
SPH
—
—
Entering Wet Bulb
Superheat at Compressor (F)
Table 5B — Superheat Charging Table, 50SS024
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
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Ewb
SPH
—
—
Entering Wet Bulb
Superheat at Compressor (F)
28
Table 5C — Superheat Charging Table, 50SS030
EVAP AIR — CFM
1000
TEMP (F)
AIR ENT
COND
Evap Air — Ewb (F)
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
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
9.3
8.8
6.7
*
*
*
*
*
6.8
LEGEND
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Ewb
SPH
—
—
Entering Wet Bulb
Superheat at Compressor (F)
Table 5D — Superheat Charging Table, 50SS036
EVAP AIR — CFM
1200
TEMP (F)
AIR ENT
COND
Evap Air — Ewb (F)
54
56
58
60
62
64
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
8.4
8.4
8.4
8.4
12.5
16.7
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
5.0
*
5.0
*
5.0
*
5.0
*
9.0
13.1
5.4
*
9.6
80
*
*
*
*
6.0
*
85
*
*
*
*
*
90
*
*
*
*
*
*
95
*
*
*
*
*
*
100
105
110
115
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
9.3
*
*
*
*
*
*
*
*
10.0
LEGEND
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Ewb
SPH
—
—
Entering Wet Bulb
Superheat at Compressor (F)
Table 5E — Superheat Charging Table, 50SS042
EVAP AIR — CFM
1400
TEMP (F)
AIR ENT
COND
Evap Air — Ewb (F)
54
56
58
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
11.0
11.0
11.0
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
24.3
22.8
21.4
20.0
20.0
20.0
18.6
17.2
70
75
7.5
*
7.5
*
7.5
*
80
*
*
*
85
*
*
*
90
*
*
*
95
*
*
*
*
100
105
110
115
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
8.0
*
*
*
*
*
*
*
7.7
LEGEND
Ewb
SPH
—
—
Entering Wet Bulb
Superheat at Compressor (F)
29
Table 5F — Superheat Charging Table, 50SS048 (Carrier Scroll Compressor)
EVAP AIR — CFM
1600
TEMP (F)
AIR ENT
COND
Evap Air — Ewb (F)
54
56
58
60
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
70
72
74
76
65
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
15.5
15.5
15.6
15.6
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
11.7
11.8
11.8
11.8
8.0
8.0
8.0
8.0
80
6.0
*
6.0
*
6.0
*
6.0
*
85
90
*
*
*
*
95
*
*
*
*
6.3
100
105
110
115
*
*
*
*
*
5.8
9.1
*
*
*
*
*
*
5.2
8.4
*
*
*
*
*
*
6.2
8.8
*
*
*
*
*
*
7.1
9.1
LEGEND
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Ewb
SPH
—
—
Entering Wet Bulb
Superheat at Compressor (F)
Table 5G — Superheat Charging Table, 50SS048 (Copeland Scroll Compressor)
EVAP AIR — CFM
1600
TEMP (F)
AIR ENT
COND
Evap Air — Ewb (F)
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
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
21.7
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
18.1
14.6
80
11.0
85
7.5
90
*
*
*
*
*
*
95
*
*
*
*
100
105
110
115
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
6.9
*
*
*
*
*
*
*
5.3
LEGEND
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Ewb
SPH
—
—
Entering Wet Bulb
Superheat at Compressor (F)
Table 5H — Superheat Charging Table, 50SS060 (Carrier Scroll Compressor)
EVAP AIR — CFM
1600
TEMP (F)
AIR ENT
COND
Evap Air — Ewb (F)
54
56
58
60
62
64
66
68
70
22.4
19.9
17.3
13.1
8.9
6.4
*
72
24.5
22.5
20.4
16.8
13.3
11.3
9.2
7.2
5.1
*
74
76
65
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
8.9
8.9
9.0
9.0
12.1
15.2
18.3
20.4
24.5
22.9
21.3
18.4
15.4
13.3
11.1
9.7
24.5
23.3
22.1
19.9
17.6
15.3
13.1
12.3
11.5
10.8
10.0
70
75
5.0
*
5.0
*
5.0
*
5.0
*
7.4
*
11.1
14.7
17.3
6.9
*
11.2
14.3
80
*
*
*
*
*
5.6
*
9.4
*
85
*
*
*
*
*
*
90
*
*
*
*
*
*
*
*
95
*
*
*
*
*
*
*
*
100
105
110
115
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
8.3
*
*
*
*
*
*
*
*
*
6.9
*
*
*
*
*
*
*
*
*
*
5.5
LEGEND
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Ewb
SPH
—
—
Entering Wet Bulb
Superheat at Compressor (F)
30
Table 5I — Superheat Charging Table, 50SS060 (Copeland Scroll Compressor)
EVAP AIR — CFM
1995
TEMP (F)
AIR ENT
COND
Evap Air — Ewb (F)
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
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
70
75
80
85
90
95
100
105
110
115
*
*
*
*
*
6.2
*
*
*
*
*
*
*
6.7
*
*
*
*
*
*
*
*
LEGEND
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Ewb
SPH
—
—
Entering Wet Bulb
Superheat at Compressor (F)
Table 6A — Superheat Charging Table, 50SX024
EVAP AIR — CFM
800
TEMP (F)
AIR ENT
COND
Evap Air — Ewb (F)
54
56
58
60
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
22.1
22.1
22.8
23.2
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
18.5
18.9
19.3
19.6
15.0
15.4
15.7
16.1
80
9.2
*
9.5
*
9.7
*
9.9
*
85
90
*
*
*
*
95
*
*
*
*
100
105
110
115
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
5.3
LEGEND
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Ewb
SPH
—
—
Entering Wet Bulb
Superheat at Compressor (F)
Table 6B — Superheat Charging Table, 50SX030
EVAP AIR — CFM
1000
TEMP (F)
AIR ENT
COND
Evap Air — Ewb (F)
54
56
58
60
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
11.2
11.2
11.2
11.2
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
7.6
*
7.7
*
7.7
*
7.7
*
80
*
*
*
*
85
*
*
*
*
90
*
*
*
*
95
*
*
*
*
*
100
105
110
115
*
*
*
*
*
*
*
*
*
*
*
5.7
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
LEGEND
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Ewb
SPH
—
—
Entering Wet Bulb
Superheat at Compressor (F)
31
Table 6C — Superheat Charging Table, 50SX036
EVAP AIR — CFM
1200
TEMP (F)
AIR ENT
COND
Evap Air — Ewb (F)
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
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
70
75
80
85
90
95
100
105
110
115
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
LEGEND
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Ewb
SPH
—
—
Entering Wet Bulb
Superheat at Compressor (F)
Table 6D — Superheat Charging Table, 50SX042
EVAP AIR — CFM
1400
TEMP (F)
AIR ENT
COND
Evap Air — Ewb (F)
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
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
70
75
80
85
90
95
100
105
110
115
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
LEGEND
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Ewb
SPH
—
—
Entering Wet Bulb
Superheat at Compressor (F)
Table 6E — Superheat Charging Table, 50SX048
EVAP AIR — CFM
1600
TEMP (F)
AIR ENT
COND
Evap Air — Ewb (F)
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
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
70
75
80
85
90
95
100
105
110
115
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
LEGEND
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Ewb
SPH
—
—
Entering Wet Bulb
Superheat at Compressor (F)
32
Table 6F — Superheat Charging Table, 50SX060
EVAP AIR — CFM
1995
TEMP (F)
AIR ENT
COND
Evap Air — Ewb (F)
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
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
70
75
80
85
90
95
100
105
110
115
*
*
*
*
*
6.2
*
*
*
*
*
*
*
6.7
*
*
*
*
*
*
*
*
LEGEND
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Ewb
SPH
—
—
Entering Wet Bulb
Superheat at Compressor (F)
Table 7 — 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.
33
INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS
AUX HEAT RANGE (VIO)
NOTE: If no heater is installed, this step can be omitted.
The airflow for electric heat is selected with theAUX HEAT
RANGE terminals. Refer to Table 3 and the installation in-
structions for electric heaters for minimum airflow required
for safe heater operation. Refer to table below for the avail-
able airflows. Each select pin is configured for a certain air-
flow. The airflow will be supplied in the Heating mode on
air conditioners when electric heat is the primary heating source.
The preset factory default selection is the highest airflow.
For cooling operation, the recommended airflow is
350 to 450 cfm per each 12,000 Btuh of rated cooling
capacity.
Tables 8-11 show airflows at several external static pres-
sures. Table 12 shows airflow for Fan Only and Cooling modes
for ICM units. Tables 13-15 show accompanying pressure
drops for wet coils, electric heaters, and filters. Refer to these
tables to determine the airflow for the system being
installed.
TERMINAL
1
2
3
4
Available
Airflow (Cfm)
1365
1470
1680
1840
NOTE: Be sure that all supply- and return-air grilles are open,
free from obstructions, and adjusted properly.
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.
Disconnect electrical power to the unit before changing
blower speed. Electrical shock can cause personal in-
jury or death.
TYPE (ORN) — The TYPE is a preset factory default se-
lection. The preset factory default setting is AC for the 50SX
units. Default setting should not be altered.
Airflow can be changed by changing the lead connections
of the blower motor.
Unit 50SS two- or 3-speed motors are factory wired for
low speed operation. Units 50SX024, 036 and 048 (460 v)
two- or 3-speed motors are factory wired for low speed. Units
50SX030 and 042 are factory wired for medium speed.
AC/HP CFM ADJUST (BLK) — The preset factory default
selection is MED. Selections HI and LO will adjust the air-
flow supplied for all operational modes (see table below).
The selection options allow installer to adjust airflow to meet
such individual needs as noise and static compensation, etc.
FAN
MODE
COOLING
HEATING
For 208/230-v and A.O. Smith 460-v Blower Motors:
The motor leads are color-coded as follows:
ONLY
−15%
15%
LO - Adjust
HI - Adjust
−10%
10%
−10%
10%
3-SPEED
2-SPEED
black = high speed
blue = medium speed
red = low speed
black = high speed
red = low speed
AC/HP TIME DELAY (GRY) — Four motor operation delay
options are provided to customize system operation. See list-
ing below:
To change the speed of the blower motor, remove the fan
motor speed leg lead from the indoor (evaporator) fan relay
(IFR) and replace with lead for desired blower motor speed.
Insulate the removed lead to avoid contact with chassis parts.
OPTION
DESCRIPTION
30-Sec On/60-Sec
Off Delay
Profile (Terminal 1) airflow.
Used when it is desirable to allow system
coils time to heat up or cool down prior to
For 460-v GE Motors:
The motor leads are color coded as follows:
Used for servicing or when other compo-
nents are used to perform the delay
function.
No Delay Option
(Terminal 2)
3-SPEED
black = high
2-SPEED
30-Sec Off Delay
(Terminal 3)
Preset factory default setting for 50SX
units.
black = high
blue = jumper
red = low
45-Sec Off Delay
(Terminal 4)
blue = jumper
orange = medium
Enhances system efficiency.
red
= low
UNIT CONTROLS — All compressors have the following
internal-protection controls.
High-Pressure Relief Valve — This valve opens when the
pressure differential between the low and high side becomes
excessive.
Compressor Overload — This overload interrupts power to
the compressor when either the current or internal tempera-
ture become excessive, and automatically resets when the
internal temperature drops to a safe level.
To change the speed of the blower motor, remove red fan
motor speed lead from the indoor (evaporator) fan relay (IFR).
The motor speed lead is attached to terminal BM. Insulate
removed lead end to avoid contact with chassis parts. On
3-speed motors only, connect orange lead to IFR. To select
high speed, separate the black (female QC) from the blue
lead (male QC) and connect the black lead to IFR. Insulate
the blue lead to avoid contact with any chassis parts.
For Integrated Control Motors (ICM) — To configure the 50SX
unit, move the 5 Easy Select board wires to the terminals
which control the airflow. Refer to the Easy Select interface
board (Fig. 32) located next to the terminal and to Fig. 33
and 34.
Perform the following steps for basic system
configuration.
This overload may require up to 60 minutes (or longer) to
reset; therefore, if the internal overload is suspected of being
open, disconnect the electrical power to the unit and check
the circuit through the overload with an ohmmeter or con-
tinuity tester.
34
SEQUENCE OF OPERATION — STD NON-ICM UNITS
Cooling
SEQUENCE OF OPERATION — ICM UNITS
Evaporator Fan — With the fan switch in the ON position,
24 v is supplied to the ICM motor through the ‘‘G’’ terminal
on the thermostat. This voltage provides continuous power
to the indoor (evaporator) fan motor (IFM). If the fan switch
is moved back to the AUTO position and there is not a call
for heating or cooling, 24 v is removed from the ‘‘G’’ ter-
minal and the evaporator fan remains energized for the de-
lay timing. When the fan switch is in AUTO, the fan cycles
with either the call for heating or cooling.
Cooling — On a call for cooling, 24 v is supplied to the com-
pressor contactor (C) and IFM simultaneously through the
‘‘Y’’ and ‘‘G’’ terminals of the thermostat. Energizing the
contactor closes the normally open set of contacts supplying
power to both the compressor and outdoor (condenser) fan
motor (OFM). On the loss of the call for cooling, 24 v is
removed from the ‘‘Y’’and ‘‘G’’terminals of the thermostat,
deenergizing the compressor and OFM. The evaporator fan
remains energized for the delay timing.
NOTE: With the FAN switch in the ON position, 24 v is
supplied to the IFR through the G terminal on the thermo-
stat. This voltage energizes the coil of the contactor, closing
the normally-open set of contacts which provide continuous
power to the indoor (evaporator) fan motor (IFM). Moving
the FAN switch back to the AUTO. position, providing there
is not a call for cooling, deenergizes the IFR, opens the IFR
contacts, and deenergizes the IFM. The FAN switch in AUTO.
position cycles upon a call for cooling.
On a call for cooling, 24 v is supplied to the compressor
contactor (C) and IFR simultaneously through the Y and G
terminals of the thermostat, respectively. On units with a
compressor time delay relay, there is a built-in, 5-minute
(± 45 seconds) delay between compressor starts. Energizing
the contactor closes the normally-open set of contacts sup-
plying power to both the compressor and outdoor (con-
denser) fan motor (OFM). Energizing the IFR closes the
normally-open set of contacts providing power to the IFM.
On the loss of the call for cooling, 24 v is removed from
both the Y and G terminals of the thermostat (providing the
FAN switch is in the AUTO. position), deenergizing both
the contactor and IFR and opening both the contacts sup-
plying power to compressor/OFM and IFM.
NOTE: Once the compressor has started and then stopped,
it cannot be restarted again until 5 minutes have elapsed.
Heating — If accessory electric heaters are installed, on a
call for heat, circuits R-W and R-G are made through the
thermostat contacts, energizing the heater relay and IFM. If
the heaters are staged, then the thermostat closes the second
set of contacts, W2, when the second stage is required. When
the thermostat is satisfied, contacts open, deenergizing the
heater relay and the IFM.
Heating — If accessory electric heaters are installed, on a
call for heat, circuit R-W is made through the thermostat con-
tacts. Circuit R-G is made which energizes the IFR. If the
heaters are staged, then the thermostat closes a second set of
contacts W2 when second stage is required. When thermo-
stat is satisfied, contacts open, deenergizing the heater relay
and the IFR.
35
Table 8 — Dry Coil Air Delivery* — Horizontal Discharge (Deduct 10% for 208 v) — Unit 50SS
230 AND 460 V HORIZONTAL DISCHARGE
UNIT
SIZE
MOTOR
External Static Pressure (in. wg)
SPEED
0.0
230
760
—
0.1
225
745
—
0.2
220
725
—
0.3
210
695
—
0.4
195
640
270
850
250
660
340
900
470
1200
400
1060
460
1200
—
0.5
170
0.6
—
0.7
—
0.8
—
0.9
—
1.0
—
Watts
Cfm
Low
High
Low
Med
High
Low
Med
High
Low
Med
High
Low
High
Low
High
Low
High
540
—
—
—
—
—
018
024
Watts
Cfm
235
200
450
240
560
320
800
445
1080
360
920
410
1020
530
1180
400
1050
440
1120
550
1325
535
1310
800
1670
785
1810
880
1900
850
1990
1110
2340
—
—
—
—
—
—
—
—
700
—
—
—
—
Watts
Cfm
280
820
365
1025
—
275
810
360
1010
—
265
755
350
975
490
1300
450
1190
—
255
700
345
940
480
1255
420
1125
480
1280
—
245
—
—
—
—
600
—
—
—
—
Watts
Cfm
330
310
720
430
1005
335
840
375
910
510
1080
380
980
410
1030
520
1220
490
1210
750
1550
730
1710
820
1770
800
1880
1050
2200
300
630
410
915
—
—
—
850
—
—
Watts
Cfm
460
390
790
—
380
620
—
—
—
1150
380
Watts
Cfm
—
460
1240
—
—
995
—
—
—
Watts
Cfm
—
435
—
—
—
030
036
—
—
—
1115
560
—
—
—
Watts
Cfm
—
—
—
490
1000
350
890
385
940
500
1110
430
1050
700
1400
680
1590
760
1630
730
1750
990
2040
460
870
—
—
—
—
—
—
—
1270
415
—
Watts
Cfm
470
1280
550
1500
—
460
1250
535
1450
—
455
1230
520
1400
—
445
1200
500
1330
—
430
1150
480
1270
625
1540
615
1460
—
—
1100
460
—
—
Watts
Cfm
—
—
1190
595
—
—
Watts
Cfm
470
1000
—
425
800
—
—
—
—
—
1440
580
Watts
Cfm
730
1620
—
700
1590
—
680
1550
—
645
1510
—
1390
850
—
—
042
048
060
Watts
Cfm
650
1230
620
1450
710
1480
650
1580
920
1870
610
1050
540
1200
660
1300
—
—
—
—
—
—
1780
840
Watts
Cfm
1080
2100
1230
2390
1150
2500
—
1040
2090
1190
2340
1100
2410
—
1020
2080
1125
2280
1050
2330
—
970
2060
1060
2210
1010
2260
—
910
1980
1010
2150
950
2170
—
1900
940
Watts
Cfm
2030
900
Watts
Cfm
2080
1170
2470
—
Watts
Cfm
880
1700
—
—
—
—
—
NOTES:
*Air delivery values are based on operating voltage of 230 v or
460 v, dry coil, without filter or electric heater. Deduct wet coil, filter,
and electric heater pressure drops to obtain external static pressure
available for ducting.
1. Do not operate the unit at a cooling airflow that is less than
350 cfm for each 12,000 Btuh of rated cooling capacity. Evapo-
rator coil frosting may occur at airflows below this point.
2. Dashes indicate portions of table that are beyond the blower mo-
tor capacity or are not recommended.
36
Table 9 — Dry Coil Air Delivery* — Vertical Discharge (Deduct 10% for 208 v) — Unit 50SS
230 AND 460 V VERTICAL DISCHARGE
UNIT
SIZE
MOTOR
External Static Pressure (in. wg)
SPEED
0.0
230
760
—
0.1
225
745
—
0.2
220
725
—
0.3
210
695
—
0.4
195
640
270
850
250
660
340
900
470
1200
400
1060
460
1200
—
0.5
170
540
235
700
245
600
330
850
460
1150
380
995
435
1115
560
1270
415
1100
460
1190
595
1440
580
1390
850
1780
840
1900
940
2030
710
2080
910
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
Watts
Cfm
Low
High
Low
Med
High
Low
Med
High
Low
Med
High
Low
High
Low
High
Low
High
—
—
—
018
024
200
450
240
560
320
800
445
1080
360
920
410
1020
530
1180
400
1050
440
1120
550
1325
535
1310
800
1670
785
1810
880
1900
660
1970
870
2120
—
—
—
—
—
—
—
—
—
—
280
820
365
1025
—
—
—
—
—
—
—
—
470
1280
550
1500
—
275
810
360
1010
—
265
755
350
975
490
1300
450
1190
—
—
—
—
455
1230
520
1400
—
255
700
345
940
480
1255
420
1125
480
1280
—
—
—
—
—
—
—
—
—
310
720
430
1005
335
840
375
910
510
1080
380
980
410
1030
520
1220
490
1210
750
1550
730
1710
820
1770
630
1860
830
2000
300
630
410
915
—
—
—
390
790
—
—
—
380
620
—
—
460
1240
—
—
—
—
—
—
—
—
—
030
036
—
—
—
490
1000
350
890
385
940
500
1110
430
1050
700
1400
680
1590
760
1630
580
1700
790
1850
460
870
—
—
—
—
—
—
—
—
—
425
800
—
—
—
—
460
1250
535
1450
—
445
1200
500
1330
—
430
1150
480
1270
625
1540
615
1460
—
—
470
1000
—
—
—
—
—
730
1620
—
700
1590
—
680
1550
—
645
1510
—
—
—
042
048
060
650
1230
620
1450
710
1480
—
—
750
1690
610
1050
540
1200
660
1300
—
—
—
—
—
—
—
—
—
1080
2100
1230
2390
890
2500
—
1040
2090
1190
2340
850
2410
—
1020
2080
1125
2280
810
2330
—
970
2060
1060
2210
780
2260
1000
2480
910
1980
1010
2150
740
2170
960
2370
Watts
Cfm
—
—
—
2250
Table 10 — Dry-Coil Air Delivery* — Horizontal Discharge (Deduct 10% for 208 V) — Unit 50SX
230 AND 460 VOLT HORIZONTAL DISCHARGE
UNIT
50SX
MOTOR
SPEED
AIR
External Static Pressure (in. wg)
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
1500
430
1200
505
1360
700
1780
810
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
—
—
—
—
—
—
—
—
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
—
—
—
—
—
1050
1850
—
1000
1830
—
970
1800
—
930
1785
1050
2000
870
1750
1000
1940
1700
930
1850
048†
—
—
—
LEGEND AND NOTES FOR TABLES 9 AND 10
NOTES:
1. Do not operate the unit at a cooling airflow that is less than
350 cfm for each 12,000 Btuh of rated cooling capacity. Evaporator-
coil frosting may occur at airflows below this point.
*Air delivery values are based on operating voltage of 230 v or
460 v, dry coil, without filter or electric heater. Deduct wet coil, filter,
and electric heater pressure drops to obtain external static pressure
available for ducting.
2. Dashes indicate portions of the table that are beyond the blower
motor capacity or are not recommended.
†Size 048 is 460 v.
37
Table 11 — Dry-Coil Air Delivery* — Vertical Discharge (Deduct 10% for 208 V) — Unit 50SX
230 AND 460 VOLT VERTICAL DISCHARGE
UNIT
SIZE
50SX
MOTOR
SPEED
AIR
External Static Pressure (in. wg)
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
0.6
240
560
320
800
445
1080
—
0.7
—
0.8
—
0.9
—
1.0
—
Watts
Cfm
Low
Med
High
Low
Med
High
Low
Med
High
Low
High
600
—
—
—
—
Watts
Cfm
330
310
720
430
1005
—
300
630
410
915
—
—
—
024,
030
850
—
—
Watts
Cfm
460
390
790
—
380
620
—
—
—
1150
425
Watts
Cfm
520
1375
575
1520
—
495
1335
560
1490
—
1140
460
—
—
—
—
—
Watts
Cfm
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
1300
614
—
—
—
Watts
Cfm
510
1170
—
480
1060
—
—
—
—
—
—
1500
430
—
Watts
Cfm
490
1400
590
1600
—
480
1380
580
1560
—
470
1340
560
1540
—
460
1300
545
1470
—
—
1200
505
—
—
—
Watts
Cfm
420
1120
600
1480
600
1330
740
1500
—
—
042
1360
700
—
—
Watts
Cfm
560
1340
—
500
1100
—
—
—
—
—
—
1780
810
Watts
Cfm
1050
1850
—
1000
1830
—
970
1800
—
930
1785
1050
2000
870
1750
1000
1940
1700
930
—
—
048†
Watts
Cfm
665
1300
—
—
—
—
1850
—
*Air delivery values are based on operating voltage of 230 v or
460 v, dry coil, without filter or electric heater. Deduct wet coil, filter,
and electric heater pressure drops to obtain external static pressure
available for ducting.
NOTES:
1. Do not operate the unit at a cooling airflow that is less than
350 cfm for each 12,000 Btuh of rated cooling capacity. Evapo-
rator coil frosting may occur at airflows below this point.
2. Dashes indicate portions of table that are beyond the blower mo-
tor capacity or are not recommended.
†Size 048 is 460 v.
Table 12 — Dry-Coil Air Delivery* — Fan Only and
Cooling; Horizontal and Vertical Discharge for
Integrated Control Motor Units at 230 V
(Deduct 10% from Cfm for 208-V Operation)
UNIT 50SX
FAN ONLY
(Cfm)
COOLING
(Cfm)
048
060
1400
1750
1600
2000
*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.
NOTE: Do not operate the unit at a cooling airflow that is less than
350 cfm for each 12,000 Btuh of rated cooling capacity. Evaporator-
coil icing may occur at airflows below this point. Water blow-off may
occur at airflows above 450 cfm per 12,000 Btuh of rated cooling
capacity.
38
Table 13 — Wet Coil Pressure Drop
AIRFLOW
(cfm)
PRESSURE DROP
UNIT SIZE
018*
(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
800
900
600
700
024
030
036
800
900
900
1000
1200
1000
1200
1400
1600
1000
1200
1400
1600
1400
1600
1800
1700
1900
2100
2300
042
048
060
*Unit 50SS only.
Table 14 — Accessory Electric Heater Pressure Drop (in. wg)
CFM
1400
0.047
HEATER
kW
600
800
1000
1200
1600
1800
2000
2200
5-20
0.030
0.033
0.037
0.042
0.052
0.060
0.067
0.075
Table 15 — Filter Pressure Drop (in. wg)
UNIT
SIZE
50SS
FILTER
SIZE
(in.)
CFM
500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300
018, 024 20 x 20 0.05 0.07 0.08 0.10 0.12 0.13
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
030, 036 20 x 24
042 24 x 24
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0.10 0.11 0.13 0.14
—
—
—
—
—
—
0.11 0.12 0.14 0.15
048, 060 24 x 30
—
—
0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.17 0.18
UNIT FILTER
CFM
SIZE
SIZE
(in.)
500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300
50SX
024-036 24 x 24
042-060 24 x 30
—
—
—
—
0.06 0.06 0.07 0.07 0.08 0.09 0.10
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0.08 0.09 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.17 0.18
39
perform all of the routine maintenance procedures that re-
quire top removal, including coil inspection and cleaning,
and condensate drain pan inspection and cleaning.
MAINTENANCE
To ensure continuing high performance, and to minimize
the possibility of premature equipment failure, periodic main-
tenance must be performed on this equipment. This cooling
unit should be inspected at least once each year by a quali-
fied service person. To troubleshoot cooling of units, refer to
Troubleshooting chart in back of book.
Only qualified service personnel should perform mainte-
nance and service procedures that require unit top removal.
Refer to the following top removal procedures:
1. Remove 7 screws on unit top cover surface. (Save all screws.)
2. Remove 4 screws on unit top cover flange. (Save all screws.)
3. Lift top from unit carefully. Set top on edge and make
sure that top is supported by unit side that is opposite
duct (or plenum) side.
NOTE TO EQUIPMENT OWNER: Consult your local dealer
about the availability of a maintenance contract.
4. Carefully replace and secure unit top to unit, using screws
removed in Steps 1 and 2, when maintenance and/or serv-
ice procedures are completed.
The ability to properly perform maintenance on this
equipment requires certain expertise, mechanical skills,
tools and equipment. If you do not possess these, do not
attempt to perform any maintenance on this
equipment, other than those procedures recommended
in the User’s Manual. FAILURE TO HEED THIS WARN-
ING COULD RESULT IN SERIOUS PERSONAL IN-
JURY AND POSSIBLE DAMAGE TO THIS EQUIP-
MENT.
Evaporator Blower and Motor
NOTE: Motors without oilers are prelubricated. Do not at-
tempt to lubricate these motors.
For longer life, operating economy, and continuing effi-
ciency, clean accumulated dirt and grease from the blower
wheel and motor annually.
The minimum maintenance requirements for this equip-
ment are as follows:
1. Inspect air filter(s) each month. Clean or replace when
necessary.
2. Inspect indoor coil, drain pan, and condensate drain each
cooling season for cleanliness. Clean when necessary.
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).
3. Inspect blower motor and wheel for cleanliness and check
lubrication each cooling season. Clean and lubricate (if
required) when necessary. For first heating season, in-
spect blower wheel bimonthly to determine proper clean-
ing frequency.
4. Check electrical connections for tightness and controls
for proper operation each cooling season. Service when
necessary.
Disconnect and tag electrical power to the unit before
cleaning and lubricating the blower motor and wheel.
Failure to adhere to this warning could cause personal
injury or death.
To clean and lubricate the blower motor and wheel:
1. Remove and disassemble blower assembly as follows:
a. Remove blower access door.
b. For standard non-ICM units, disconnect motor lead from
IFR. Disconnect yellow motor lead from terminal L2
of the contactor.
c. Remove blower assembly from all units. Be careful
not to tear insulation in blower compartment.
d. Ensure proper reassembly by marking blower wheel
and motor in relation to blower housing before
disassembly.
e. Loosen setscrew(s) which secure wheel to motor shaft.
Remove screws that secure motor mount brackets to
housing and slide motor and motor mount out of
housing.
Failure to follow these warnings could result in serious
personal injury:
1. Turn off electrical power to the unit before perform-
ing any maintenance or service on the unit.
2. Use extreme caution when removing panels and parts.
As with any mechanical equipment, personal injury
can result from sharp edges.
3. Never place anything combustible either on, or in con-
tact with, the unit.
Air Filter
2. Lubricate motor as follows:
a. Thoroughly clean all accumulations of dirt or grease
from motor housing.
b. Remove dust caps or plugs from oil ports located at
each end of motor.
c. Use a good grade of SAE 20 nondetergent motor oil
and put one teaspoon (1⁄16 oz. or 16 to 25 drops) in
each oil port.
d. Allow time for oil to be absorbed by each bearing,
then wipe excess oil from motor housing.
Never operate the unit without a suitable air filter in the
return-air duct system. Always replace the filter with the
same dimensional size and type as originally installed.
See Tables 1 and 2 for recommended filter sizes.
Inspect air filter(s) at least once each month and replace
(throwaway-type) or clean (cleanable-type) at least twice dur-
ing each cooling season or whenever the filters become clogged
with dust and lint.
Replace filters with the same dimensional size and type as
originally provided, when necessary.
e. Replace dust caps or plugs in oil ports.
3. Remove and clean blower wheel as follows:
a. Ensure proper reassembly by marking wheel orienta-
tion and cutoff plate location.
Unit Top Removal
NOTE: When performing maintenance or service proce-
dures that require removal of the unit top, be sure to
b. Remove screws holding cut-off plate, and remove plate
from housing.
40
c. Lift wheel from housing. When handling and/or clean-
ing blower wheel, be sure not to disturb balance weights
(clips) on blower wheel vanes.
d. Remove caked-on dirt from wheel and housing with a
brush. Remove lint and/or dirt accumulations from wheel
and housing with vacuum cleaner, using soft brush at-
tachment. Remove grease and oil with mild solvent.
e. Reassemble wheel and cut-off plate into housing.
f. Reassemble motor into housing. Be sure setscrews are
tightened on motor-shaft flats and not on round part of
shaft.
Condenser Coil, Evaporator Coil, and Conden-
sate Drain Pan — Inspect the condenser coil, evapo-
rator coil, and condensate drain pan at least once each year.
Proper inspection and cleaning requires the removal of the
unit top. See Unit Top Removal section on page 40.
The coils are easily cleaned when dry; therefore, inspect
and clean the coils either before or after each cooling sea-
son. Remove all obstructions (including weeds and shrubs)
that interfere with the airflow through the condenser coil.
Straighten bent fins with a fin comb. If coated with dirt or
lint, clean the coils with a vacuum cleaner, using a soft brush
attachment. Be careful not to bend the fins. If coated with oil
or grease, clean the coils with a mild detergent-and-water
solution. Rinse coils with clear water, using a garden hose.
Be careful not to splash water on motors, insulation, wiring,
or air filter(s). For best results, spray condenser-coil fins from
inside to outside the unit. On units with an outer and inner
condenser coil, be sure to clean between the coils. Be sure
to flush all dirt and debris from the unit base.
Fig. 35 — Fan Blade Clearance
all screw connections. If any smoky or burned connections
are noticed, disassemble the connection, clean all the parts,
restrip the wire end and reassemble the connection properly
and securely.
After inspecting the electrical controls and wiring, re-
place all the panels. Start the unit, and observe at least one
complete cooling cycle to ensure proper operation. If dis-
crepancies are observed in operating cycle, or if a suspected
malfunction has occurred, check each electrical component
with the proper electrical instrumentation. Refer to the unit
wiring label when making these checkouts.
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 Cooling Sequence of Operation section
on page 35, as an aid in determining proper control
operation.
Refrigerant Circuit — Inspect all refrigerant tubing con-
nections and the unit base for oil accumulations annually.
Detecting oil generally indicates a refrigerant leak.
Condenser Fan
If oil is detected or if low cooling performance is sus-
pected, leak-test all refrigerant tubing using an electronic leak-
detector, or liquid-soap solution. If a refrigerant leak is
detected, refer to Check for Refrigerant Leaks section on
page 27.
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.
If no refrigerant leaks are found and low cooling perfor-
mance is suspected, refer to Checking and Adjusting Refrig-
erant Charge section on page 27.
1. Remove 2 screws at bottom of condenser air intake grille
and remove plastic grille.
2. Inspect the fan blades for cracks or bends.
3. If fan needs to be removed, loosen the setscrew and slide
the fan off the motor shaft.
Evaporator Airflow — The cooling airflow does not
require checking unless improper performance is suspected.
If a problem exists, be sure that all supply- and return-air
grilles are open and free from obstructions, and that the air
filter is clean. When necessary, refer to Indoor Airflow and
Airflow Adjustments section on page 34 to check the system
airflow.
4. When replacing fan blade, position blade so that lead-
ing edge is 2 in. back from condenser inlet grille or
1
⁄
2
in. maximum from fan deck. See Fig. 35.
5. Ensure that setscrew engages the flat area on the motor
shaft when tightening.
Metering Devices — Refrigerant metering devices are
fixed orifices and are located in the inlet header to the evapo-
rator coil.
Electrical Controls and Wiring — Inspect and check
the electrical controls and wiring annually. Be sure to turn
off the electrical power to the unit.
Remove the control/blower and compressor compartment
access panels to locate all the electrical controls and wiring.
Check all electrical connections for tightness. Tighten
Liquid Line Strainer — The liquid line strainer
(to protect metering device) is made of wire mesh and is
located in the liquid line on the inlet side of the metering
device.
41
TROUBLESHOOTING COOLING CHART
SYMPTOM
CAUSE
REMEDY
Compressor and con-
denser fan will not
start.
Power failure
Call power company.
Fuse blown or circuit breaker tripped
Replace fuse or reset circuit breaker.
Replace component.
Defective thermostat, contactor, transformer,
or control relay
Insufficient line voltage
Incorrect or faulty wiring
Thermostat setting too high
Determine cause and correct.
Check wiring diagram and rewire correctly.
Lower thermostat setting below room temperature.
Single-phase units with scroll compressor
(50SS048,060 and 50SX) have a 5-minute time delay
DO NOT bypass this compressor time delay — wait
for 5 minutes until time-delay relay is deenergized.
Compressor will not
start but condenser
fan runs.
Faulty wiring or loose connections in
compressor circuit
Check wiring and repair or replace.
Determine cause. Replace compressor.
Determine cause and replace.
Compressor motor burned out, seized, or
internal overload open
Defective run/start capacitor, overload,
or start relay
One leg of 3-phase power dead
Replace fuse or reset circuit breaker.
Determine cause.
Three-phase scroll
compressor
Scroll compressor is rotating in the
wrong direction
Correct the direction of rotation by reversing the
3-phase power leads to the unit.
(50SS048, 060;
50SX036-060
units only) makes ex-
cessive noise, and
there may be a low
pressure differential.
Compressor cycles
(other than normally
satisfying thermostat).
Refrigerant overcharge or undercharge
Reclaim refrigerant, evacuate system, and recharge
to capacities shown on nameplate.
Defective compressor
Insufficient line voltage
Blocked condenser
Replace and determine cause.
Determine cause and correct.
Determine cause and correct.
Determine cause and replace.
Defective run/start capacitor, overload
or start relay
Defective thermostat
Replace thermostat.
Faulty condenser-fan motor or capacitor
Restriction in refrigerant system
Dirty air filter
Replace.
Locate restriction and remove.
Replace filter.
Compressor operates
continuously.
Unit undersized for load
Thermostat set too low
Low refrigerant charge
Leaking valves in compressor
Air in system
Decrease load or increase unit size.
Reset thermostat.
Locate leak, repair and recharge.
Replace compressor.
Reclaim refrigerant, evacuate system and recharge.
Clean coil or remove restriction.
Replace filter.
Condenser coil dirty or restricted
Dirty air filter
Excessive head
pressure.
Dirty condenser coil
Clean coil.
Refrigerant overcharged
Air in system
Reclaim excess refrigerant.
Reclaim refrigerant, evacuate system and recharge.
Determine cause and correct.
Check for leaks, repair and recharge.
Replace compressor.
Condenser air restricted or air short-cycling
Low refrigerant charge
Compressor valves leaking
Restriction in liquid tube
High heat load
Head pressure too low.
Remove restriction.
Excessive suction
pressure.
Check for source and eliminate.
Replace compressor.
Compressor valves leaking
Refrigerant overcharged
Dirty air filter
Reclaim 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
Reset thermostat.
Install low-ambient kit.
Replace.
Field-installed filter-drier restricted
42
TROUBLESHOOTING COOLING CHART (cont)
SYMPTOM
CAUSE
REMEDY
Integrated control motor
(units 50SX048 208/230 v
and 50SX060)
Blower wheel not secured to shaft.
Insufficient voltage at motor
Properly tighten blower wheel to shaft.
Determine cause and correct.
Power connectors not properly seated
Motor programmed with a delay profile
With thermostat in OFF the voltage on
Connectors should snap easily; do not force.
IFM does not run.
Integrated control motor (units
50SX048 208/230 v
Allow a few minutes for motor to shut off.
1
If measured voltage is more than
⁄
2, the ther-
and 50SX060)
G,Y1,Y/Y2,W with respect to common,
mostat is incompatible with motor. If voltage is
less than ⁄2, the motor has failed.
IFM runs when it should be off.
1
1
should be less than
voltage supply
⁄
2
of actual low
Integrated control motor (units
50SX048 208/230 v
Water dripping into motor
Verify proper drip loops in connector wires.
Connectors not firmly seated
Gently pull wires individually to be sure they
are crimped into the housing.
and 50SX060)
IFM operation is intermittent.
IFM
—
Indoor (Evaporator) Fan Motor
43
PACKAGED SERVICE TRAINING
Our packaged service training programs provide an excellent way to increase your knowledge of the
equipment discussed in this manual. Product programs cover:
• Unit Familiarization
• Installation Overview
• Maintenance
• Operating Sequence
A large selection of product, theory, and skills programs is available. All programs include a video
cassette and/or slides and a companion booklet. Use these for self teaching or to conduct full training
sessions.
For a free Service Training Material Catalog (STM), call 1-800-962-9212. Ordering instructions are
included.
Copyright 1995 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 PC 111 Catalog No. 535-022 Printed in U.S.A. Form 50SS,SX-4SI Pg 46 5-95 Replaces: 50SS,SX-3SI
Tab 1b 6b
4
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 REMOVE ALL SHIPPING HOLDDOWN BOLTS AND BRACKETS PER INSTALLATION INSTRUCTIONS
Ⅺ VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS
Ⅺ CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS
Ⅺ CHECK THAT INDOOR 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
INDOOR FAN AMPS
TEMPERATURES
OUTDOOR-AIR TEMPERATURE
RETURN-AIR TEMPERATURE
COOLING SUPPLY AIR
DB
DB
WB
PRESSURES
REFRIGERANT SUCTION
REFRIGERANT DISCHARGE
PSIG
PSIG
Ⅺ VERIFY THAT 3-PHASE SCROLL COMPRESSOR (50SS048,060; 50SX036-060 UNITS ONLY) IS ROTATING
IN CORRECT DIRECTION
Ⅺ VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS ON PAGES 28-33.
Copyright 1995 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
4
PC 111
Catalog No. 535-022
Printed in U.S.A.
Form 50SS,SX-4SI
Pg CL-1
5-95
Replaces: 50SS,SX-3SI
Tab 1b 6b
|