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
• 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
• 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
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,
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
TROUBLESHOOTING COOLING CHART . . . . . 42,43
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-1
Fig. 1 — Unit 50SX With Optional Base Rail Shown
NOTE TO INSTALLER — Before the installation, READ
THESE INSTRUCTIONS CAREFULLY AND COMPLETELY. Also, make sure the Owner’s Manual and Service Instructions are left with the unit after installation.
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical components. Only trained and qualified personnel should install,
repair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions of cleaning coils and filters. All other operations should
be performed by trained service personnel. When working
on air-conditioning equipment, observe precautions in the
literature, tags and labels attached to the unit, and other safety
precautions that may apply.
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire extinguisher available for all brazing operations.
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.
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 downflow discharge configurations for rooftop applications. See
Fig. 10 for roof curb dimensions.
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 4
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
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)
UNIT
50SS
018
024
030
036
042
CENTER OF GRAVITY (in./mm)
X
Y
Z
19.6/499
21.7/551
10.6/269
22.5/570
20.9/530
10.0/254
22.1/561
20.3/516
10.0/253
21.2/538
19.9/506
9.9/251
21.3/540
19.9/506
11.3/286
LEGEND
CG
— Center of Gravity
NEC
— National Electrical Code
COND — Condenser
REQ’D — Required
MAT’L — Material
NOTES:
1. Clearances must be maintained to prevent recirculation of air from
outdoor-fan discharge.
2. Dimensions in ( ) are in millimeters.
UNIT
50SS
ELECTRICAL
CHARACTERISTICS
018
024
030
036
042
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
208/230-1-60, 208/230-3-60, 460-3-60
UNIT WT
Lb
208
237
254
270
300
Kg
95
108
115
123
135
CORNER WT (Lb/Kg)
A
61/28
60/27
61/28
75/35
81/40
B
43/20
54/25
58/26
48/22
57/26
C
69/31
92/42
96/44
109/50
117/53
D
35/16
31/14
39/18
37/17
45/20
UNIT HEIGHT
(in./mm)
E
24.1/613
24.1/613
24.1/613
24.1/613
28.1/714
Fig. 2 — Dimensions; Units 50SS018-042 Without Base Rail
2
DIMENSION
(in./mm)
F
18.2/462
18.2/462
18.2/462
18.2/462
22.2/563
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)
UNIT
50SS
018
024
030
036
042
CENTER OF GRAVITY (in./mm)
X
Y
Z
19.5/495
21.7/551
12.9/328
22.1/562
20.9/532
12.3/313
21.8/554
20.4/519
12.3/312
21.0/533
20.1/509
12.2/310
21.0/532
20.1/510
13.6/344
LEGEND
CG
— Center of Gravity
NEC
— National Electrical Code
COND — Condenser
REQ’D — Required
MAT’L — Material
NOTES:
1. Clearances must be maintained to prevent recirculation of air from
outdoor-fan discharge.
2. Dimensions in ( ) are in millimeters.
UNIT
50SS
ELECTRICAL
CHARACTERISTICS
018
024
030
036
042
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
208/230-1-60, 208/230-3-60, 460-3-60
UNIT WT
Lb
228
257
274
290
320
Kg
104
117
125
132
146
CORNER WT (Lb/Kg)
A
66/30
65/30
66/30
81/37
86/39
B
48/22
59/27
63/29
53/24
62/28
C
74/34
97/44
101/46
114/52
122/55
D
40/18
36/16
44/20
42/19
50/23
UNIT HEIGHT
(in./mm)
E
27.4/697
27.4/697
27.4/697
27.4/697
31.4/798
Fig. 3 — Dimensions; Units 50SS018-042 with Optional Base Rail
3
DIMENSION
(in./mm)
F
21.5/546
21.5/546
21.5/546
21.5/546
25.5/648
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)
UNIT
50SS
ELECTRICAL
CHARACTERISTICS
048
060
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
UNIT
50SS
048
060
X
21.9/555
22.2/565
CG
— Center of Gravity
COND — Condenser
MAT’L — Material
CENTER OF GRAVITY (in./mm)
Y
Z
19.6/498
13.4/341
19.8/503
13.4/340
LEGEND
NEC
— National Electrical Code
REQ’D — Required
NOTES:
1. Clearances must be maintained to prevent recirculation of air from outdoor-fan discharge.
2. Dimensions in ( ) are in millimeters.
UNIT WT
Lb
332
359
Kg
151
163
A
82/37
65/30
CORNER WT (Lb/Kg)
B
C
68/31
131/60
99/45
120/55
Fig. 4 — Dimensions; Units 50SS048,060 Without Base Rail
4
D
51/23
75/34
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)
UNIT
50SS
048
060
X
21.7/550
22.0/560
CG
— Center of Gravity
COND — Condenser
MAT’L — Material
CENTER OF GRAVITY (in./mm)
Y
Z
19.7/501
15.7/400
19.9/506
15.7/399
LEGEND
NEC
— National Electrical Code
REQ’D — Required
NOTES:
1. Clearances must be maintained to prevent recirculation of air from outdoor-fan discharge.
2. Dimensions in ( ) are in millimeters.
UNIT
50SS
ELECTRICAL
CHARACTERISTICS
048
060
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
UNIT
Lb
352
379
WT
Kg
160
172
A
87/40
70/32
Fig. 5 — Dimensions; Units 50SS048,060 With Optional Base Rail
5
CORNER WT (Lb/Kg)
B
C
D
73/33
136/62
56/25
104/47
125/57
80/36
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)
LEGEND
CG
— Center of Gravity
NEC
— National Electrical Code
COND — Condenser
REQ’D — Required
MAT’L — Material
NOTES:
1. Clearances must be maintained to prevent recirculation of air from
outdoor-fan discharge.
2. Dimensions in ( ) are in millimeters.
UNIT
50SX
024
030
036
CENTER OF GRAVITY (in./mm)
X
Y
Z
21.7/552
20.7/527
12.7/321
21.9/556
20.7/525
12.7/321
20.8/528
20.0/507
12.7/321
UNIT
50SX
ELECTRICAL
CHARACTERISTICS
024
030
036
208/230-1-60
208/230-1-60
208/230-1-60, 208/230-3-60, 460-3-60
UNIT WT
Lb
270
273
291
Kg
123
124
132
A
67/30
66/30
80/36
CORNER WT (Lb/Kg)
B
C
62/28
99/45
64/29
100/45
54/25
112/51
Fig. 6 — Dimensions; Units 50SX024-036 Without Base Rail
6
D
42/19
43/20
45/20
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)
CG
— Center of Gravity
COND — Condenser
MAT’L — Material
LEGEND
NEC
— National Electrical Code
REQ’D — Required
NOTES:
1. Clearances must be maintained to prevent recirculation of air from
outdoor-fan discharge.
2. Dimensions in ( ) are in millimeters.
UNIT
50SX
024
030
036
CENTER OF GRAVITY (in./mm)
X
Y
Z
21.5/546
20.8/528
15.0/380
21.7/550
20.7/527
15.0/380
20.6/524
20.1/510
15.0/380
UNIT
50SX
ELECTRICAL
CHARACTERISTICS
024
030
036
208/230-1-60
208/230-1-60
208/230-1-60, 208/230-3-60, 460-3-60
UNIT WT
Lb
290
293
311
Kg
132
133
142
A
72/33
71/32
85/39
CORNER WT (Lb/Kg)
B
C
67/30
104/47
69/31
105/48
59/27
117/53
Fig. 7 — Dimensions; Units 50SX024-036 With Optional Base Rail
7
D
47/21
48/22
50/23
Fig. 8 — Dimensions; Units 50SX042-060 Without Base Rail
8
LEGEND
CG
— Center of Gravity
NEC
— National Electrical Code
COND — Condenser
REQ’D — Required
MAT’L — Material
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 outdoorfan discharge.
2. Dimensions in ( ) are in millimeters.
UNIT
50SX
042
048
060
UNIT
50SX
042
048
060
CENTER OF GRAVITY (in./mm)
X
Y
Z
21.0/533
20.1/510
15.4/390
21.8/553
19.7/499
15.4/390
22.2/565
19.8/503
13.4/340
UNIT
Lb
309
340
359
ELECTRICAL
CHARACTERISTICS
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60
WT
Kg
140
155
163
CORNER WT (Lb/Kg)
A
B
C
D
84/38 59/27 119/54 47/21
84/38 70/32 133/60 53/24
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
— Center of Gravity
NEC
— National Electrical Code
COND — Condenser
REQ’D — Required
MAT’L — Material
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 outdoorfan discharge.
2. Dimensions in ( ) are in millimeters.
UNIT
50SX
042
048
060
CENTER OF GRAVITY (in./mm)
X
Y
Z
20.8/529
20.2/512
17.3/440
21.6/548
19.8/502
17.3/440
22.0/560
19.9/506
15.7/399
UNIT
50SX
ELECTRICAL
CHARACTERISTICS
042
048
060
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60, 460-3-60
208/230-1-60, 208/230-3-60
UNIT
Lb
329
360
379
WT
Kg
150
164
172
A
89/40
89/40
70/32
CORNER WT (Lb/Kg)
B
C
D
64/29
124/56 52/24
75/34
138/63 58/26
104/47 125/57 80/36
Fig. 9 — Dimensions; Units 50SX042-060 With Optional Base Rail (cont)
11
FLAT
CURB
PART NUMBER
CPRFCURB001A00
CPRFCURB002A00
CPRFCURB003A00
‘‘A’’
89 [203]
119 [279]
149 [356]
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 number 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 materials. 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 transportation inspectors before removal. Forward claim papers
directly to transportation company. Manufacturer is not responsible 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 rigging 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 packages until installation.
Step 2 — Provide Unit Support
ROOF CURB — Install accessory roof curb in accordance
with instructions shipped with curb. See Fig. 10. Install insulation, cant strips, roofing, and flashing. Ductwork must
be attached to curb.
UNITS WITHOUT BASE RAILS — Accessory rigging brackets 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 applied 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 below −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 casing 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 possible. Be sure brackets are well outside of center of gravity. (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 prevent straps from damaging unit. If wood top is not available, use spreader bars of sufficient length.
Step 3 — Provide Clearances — The required minimum 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 decorative 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 overhead obstruction. The minimum clearance under a partial overhang (such as a normal house overhang) is 48 in. above the
unit top. The maximum horizontal extension of a partial overhang must not exceed 48 inches.
UNITS WITH OPTIONAL BASE RAILS — Keep unit upright 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 instructions 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.
UNIT SIZE
50SS
018
024
030
036
042
048
060
UNIT SIZE
50SX
024
030
036
042
048
060
SHIPPING WEIGHT
Lb
Kg
260
118
289
131
306
139
322
146
333
151
384
174
411
186
in.
363⁄4
363⁄4
363⁄4
363⁄4
363⁄4
363⁄4
363⁄4
SHIPPING WEIGHT
Lb
Kg
322
146
325
147
343
155
361
164
392
178
411
186
in.
363⁄4
363⁄4
363⁄4
363⁄4
363⁄4
363⁄4
All panels must be in place when rigging.
A
B
mm
934
934
934
934
934
934
934
in.
18
163⁄4
165⁄16
161⁄4
167⁄16
161⁄4
161⁄4
mm
934
934
934
934
934
934
in.
143⁄4
141⁄2
155⁄8
151⁄2
1411⁄16
161⁄4
A
C
mm
457
426
415
412
416
412
412
in.
241⁄8
241⁄8
241⁄8
241⁄8
281⁄8
341⁄8
341⁄8
mm
375
368
397
394
373
412
in.
281⁄8
281⁄8
281⁄8
341⁄8
341⁄8
341⁄8
mm
613
613
613
613
714
867
867
B
C
mm
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.
UNIT SIZE
50SS
018
024
030
036
042
048
060
SHIPPING
WEIGHT
Lb
Kg
247
112
276
125
293
133
309
140
339
154
371
168
398
180
A
in.
36.5
36.5
36.8
36.5
36.5
36.5
36.5
B
mm
926.0
926.0
926.0
926.0
926.0
926.0
926.0
in.
17.0
14.3
14.7
15.5
15.5
14.8
14.4
C
mm
431
364
372
393
394
376
366
in.
28.2
28.2
28.2
28.2
32.2
38.2
38.2
mm
715
715
715
715
817
969
969
All panels must be in place when rigging.
UNIT SIZE
50SX
024
030
036
042
048
060
SHIPPING
WEIGHT
Lb
Kg
309
140
312
141
330
150
348
158
379
172
398
180
A
in.
36.5
36.5
36.5
36.5
36.5
36.5
B
mm
926.0
926.0
926.0
926.0
926.0
926.0
Fig. 12 — Suggested Rigging for Units with Optional Base Rail
14
in.
15.0
14.8
15.8
15.6
14.9
14.4
C
mm
380
376
402
397
378
366
in.
32.2
32.2
32.2
38.2
38.2
38.2
mm
817
817
817
969
969
969
Table 1 — Physical Data — Unit 50SS
UNIT 50SS
REFRIGERANT
Metering Device
Charge (lb)
OPERATING WEIGHT (lb)
Without Base Rails
With Optional Base Rails
COMPRESSOR TYPE
EVAPORATOR FAN
Speeds
Nominal Rpm
Diameter (in.)
Width (in.)
Nominal Airflow (Cfm)
Motor Hp
EVAPORATOR COIL
Rows...Fins/in.
Face Area (sq ft)
CONDENSER FAN
Cfm
Nominal Rpm
Diameter (in.)
Motor Hp
CONDENSER COIL
Rows...Fins/in.
Face Area (sq ft)
FILTER SIZE (in.)*
Throwaway
018
024
030
2.60
2.75
3.40
208
228
Rotary
237
257
Reciprocating
2
825
10
9
600
1⁄4
3
1075
10
9
800
1⁄4
3...15
1.83
3...15
2.29
1700
850
18
1⁄8
036
R-22
Acutrol™ System
4.30
042
048
060
5.20
6.50
7.00
300
320
Reciprocating
332
352
Scroll
359
379
Scroll
2
1100
10
9
1400
3 ⁄4
2
1100
10
9
1600
3⁄4
2
1100
10
9
1995
1
3...15
3.60
3...15
4.44
4...15
4.44
1700
850
18
1⁄8
3...15
3...15
2.29
3.06
Propeller — Direct Drive
1900
1900
1050
1050
18
18
1 ⁄4
1 ⁄4
1900
1050
18
1 ⁄4
2400
1050
20
1⁄3
2400
1050
20
1 ⁄3
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
20x20
20x20
20x24
20x24
24x24
24x30
24x30
254
270
274
290
Reciprocating
Reciprocating
Centrifugal — Direct Drive
3
3
1100
1100
10
10
9
9
1000
1200
1 ⁄2
1 ⁄2
*Recommended field-supplied filters are 1 in. thick.
Table 2 — Physical Data — Unit 50SX
UNIT 50SX
REFRIGERANT
Metering Device
Charge (lb)
OPERATING WEIGHT (lb)
Without Base Rails
With Optional Base Rails
COMPRESSOR TYPE
EVAPORATOR FAN
Motor Type
Speeds
Nominal Rpm
Diameter (in.)
Width (in.)
Nominal Airflow (Cfm)
Motor Hp
EVAPORATOR COIL
Rows...Fins/in.
Face Area (sq ft)
CONDENSER FAN
Cfm
Nominal Rpm
Diameter (in.)
Motor Hp
CONDENSER COIL
Rows...Fins/in.
Face Area (sq ft)
FILTER SIZE (in.)†
Throwaway
024
030
036
042
R-22
Acutrol™ System
5.7
3.9
4.5
5.4
270
290
273
293
291
311
Std
3
1075
10
9
800
1⁄4
Std
3
1075
10
9
1000
1 ⁄4
309
329
Scroll
Centrifugal — Direct Drive
Std
Std
Std*
3
3
2
1100
1100
1125
10
10
10
9
9
9
1200
1400
1600
1 ⁄2
1 ⁄2
3 ⁄4
2...15
3.60
3...15
2.70
4...15
3.60
2200
1100
20
1⁄4
048
060
5.8
6.5
340
360
359
379
ICM
Variable
—
10
9
1600
1
ICM
Variable
—
10
9
1995
1
4...15
4.44
4...15
4.44
2200
1100
20
1 ⁄4
3...15
4.44
Propeller — Direct Drive
2200
2400
1100
1100
20
20
1 ⁄4
1 ⁄4
2400
1100
20
1 ⁄4
2400
1050
20
1⁄3
2...17
7.00
2...17
7.00
2...17
7.00
2...17
8.66
2...17
8.66
2...17
8.66
24x24
24x24
24x24
24x30
24x30
24 x 30
LEGEND
ICM — Integrated Control Motor
*460 v only.
†Recommended field-supplied filters are 1 in. thick.
NOTE: Standard motors are non-integrated control motors.
15
and Air Conditioning Contractors Association (ACCA) minimum installation standards for residential heating and air
conditioning systems.
• Secure all ducts to building structure. Flash, weatherproof, and vibration-isolate duct openings in wall or roof
according to good construction practices.
Figure 14 shows a typical duct system with 50SS,SX
installed.
Step 5 — Select and Install Ductwork — The design and installation of the duct system must be in accordance with the standards of the NFPA (National Fire Protection Association) for installation of nonresidence-type air
conditioning and ventilating systems, NFPA 90A or residencetype,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.
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.
Power Wiring
Control Wiring
Condenser Airflow
*Separate disconnect per NEC
(National Electrical Code) required
for electric heater when singlepoint connection is not used.
Evaporator Airflow
Fig. 14 — Typical Installation
Table 3 — Minimum Airflow for Safe Electric
Heater Operation (Cfm)
Fig. 13 — Area Not To Be Drilled
018*
700
• All units should have field-supplied filters or accessory filter rack installed in the return-air side of the unit. Recommended sizes for filters are shown in Tables 1 and 2.
• Avoid abrupt duct size increases and reductions. Abrupt
change in duct size adversely affects air performance.
024
700
030
875
SIZE
036
1200
042
1225
048
1400
060
1750
*Unit 50SS only.
CONVERTING HORIZONTAL DISCHARGE UNITS TO
DOWNFLOW (VERTICAL) DISCHARGE — STD (NonIntegrated Control Motor [Non-ICM] UNITS — Units are
shipped in a horizontal configuration. To convert a horizontal unit for downflow (vertical) discharge, perform the following steps:
IMPORTANT: Use flexible connectors between
ductwork and unit to prevent transmission of vibration. Use suitable gaskets to ensure weathertight and
airtight seal. When electric heat is installed, use fireproof canvas (or similar heat resistant material) connector between ductwork and unit discharge connection. 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 service 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. Remove the screws securing the cover to the basepan and
slide out the cover. Discard the cover (Fig. 17).
• Size ductwork for cooling air quantity (cfm). The minimum air quantity for proper electric heater operation is
listed in Table 3. Heater limit switches may trip at air quantities below those recommended.
• 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 Conditioning 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 evaporatorfan 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 housing to blower shelf and carefully slide out blower housing. 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 removed 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).
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.
15. After completing unit installation, perform all safety checks
and power up unit.
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.
12. Orient blower housing for vertical airflow (blower motor 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.
Resistance will be felt as the blower housing contacts
the basepan insulation; this can be overcome by applying 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 (Integrated Control Motor) UNITS — Units are shipped in a horizontal configuration. To convert a horizontal unit for downflow (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 service 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. Remove 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 housing to blower shelf and carefully slide out blower housing. 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. Discard the blower shelf.
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 removed 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.
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.
13. Orient blower housing for vertical airflow (blower motor 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 applying 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 removed in Step 6.
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 access panels.
17. After completing unit installation, perform all safety checks
and power up unit.
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
NOTE: Do not drill more than 1⁄2-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 comply with local codes, restrictions, and practices.
Unit disposes of condensate through a 3⁄4-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 condensate trap at end of condensate connection to ensure proper
drainage. Make sure that the outlet of the trap is at least
1 in. lower than the drain-pan condensate connection to prevent the pan from overflowing. See Fig. 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.
3. Partially secure duct flanges using two of the no. 10, 1⁄2-in.
screws provided.
If the installation requires draining the condensate water
away from the unit, install a 2-in. trap using a 3⁄4-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 connection 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 beginning of the cooling season start-up.
20
HIGH-VOLTAGE CONNECTIONS — The unit must have
a separate electrical service with a field-supplied, waterproof disconnect switch mounted at, or within sight from the
unit. Refer to the unit rating plate for maximum fuse/circuit
breaker size and minimum circuit amps (ampacity) for wire
sizing. See Tables 4A and 4B for electrical data.
The field-supplied disconnect 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 service 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 conduit approved for electrical ground when installed in accordance 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 copper wire between disconnect and unit. The high-voltage leads
should be in a conduit until they enter the duct panel; conduit 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 wiring splice box.
Failure to follow these precautions could result in damage to the unit being installed:
1. Make all electrical connections in accordance with
NEC ANSI/NFPA (latest edition) and local electrical codes governing such wiring. In Canada, all
electrical connections must be in accordance with CSA
Standard C22.1 Canadian Electrical Code Part 1
and applicable local codes. Refer to unit wiring
diagram.
2. Use only 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 operating 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 contained 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, conduit, etc.
ROUTING CONTROL POWER WIRES — STD NONICM 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.
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 thermostat 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 Procedures for 208-v Operation section on page 24.
21
Table 4A — Electrical Data — 50SS Units
UNIT SIZE
50SS
V-PH-Hz
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
208/230-1-60
208/230-3-60
460-3-60
208/230-1-60†
208/230-1-60**
208/230-3-60†
208/230-3-60**
460-3-60†
460-3-60**
208/230-1-60†
208/230-1-60**
208/230-3-60†
208/230-3-60**
460-3-60†
460-3-60**
030
036
042
048
060
VOLTAGE RANGE
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
COMPRESSOR
RLA
8.3
12.4
14.4
9.4
18.0
11.7
5.6
20.4
14.0
6.4
21.8
26.4
12.8
15.0
16.0
19.3
28.9
32.1
6.4
8.2
8.0
10.0
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
OUTDOOR- INDOORFAN
FAN
POWER SUPPLY AWG 60C MAX WIRE
MIN WIRE LENGTH (ft)
MOTOR
MOTOR
SIZE
FLA
FLA
MCA
MOCP*
0.7
1.8
12.0
15
14
75
0.7
2.0
18.2
30
12
80
1.4
2.3
21.8
30
10
100
1.4
2.3
15.5
25
12
80
1.4
2.8
26.7
40
10
90
1.4
2.8
18.8
30
12
65
0.8
1.4
9.2
10
14
100
1.4
4.0
30.9
50
8
100
1.4
4.0
22.9
35
10
85
0.8
2.0
10.8
15
14
100
2.1
5.0
40.1
60
6
100
2.1
5.0
40.1
60
6
100
2.1
5.0
23.1
35
10
75
2.1
5.0
25.9
40
10
75
2.1
6.8
33.0
40
8
90
2.1
6.8
33.0
50
8
90
2.1
6.8
49.0
60
6
100
2.1
6.8
49.0
60
6
100
1.1
2.3
11.4
15
14
100
1.1
2.3
13.7
20
14
100
1.1
3.2
16.8
20
12
100
1.1
3.2
16.8
25
12
100
EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
452 + 464 + 455
Average Voltage =
3
1371
= 3
= 457
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
7
% Voltage Imbalance = 100 x
457
= 1.53%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
LEGEND
AWG — American Wire Gage
BRKR — Breaker
CUL
— Canadian Underwriters’ Laboratories
FLA
— Full Load Amps
HACR — Heating, Air Conditioning and
Refrigeration
LRA
— Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
NEC
— National Electrical Code
RLA
— Rated Load Amps
*Fuse or HACR Breaker.
†Carrier Scroll Compressor.
**Copeland Scroll Compressor.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the
overcurrent protective device for the unit shall be fuse or HACR
breaker. The 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, determine size from NEC.
3. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is greater than 2%. Use the following formula to determine
the percentage of voltage imbalance.
% Voltage Imbalance
= 100 x
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
max voltage deviation from average voltage
average voltage
22
Table 4B — Electrical Data — 50SX Units
UNIT SIZE
50SX
V-PH-Hz
024
030
208/230-1-60
208/230-1-60
208/230-1-60
208/230-3-60
460-3-60
208/230-1-60
208/230-3-60
460-3-60
208/230-1-60
208/230-3-60
460-3-60
208/230-1-60
208/230-3-60
036
042
048
060
VOLTAGE RANGE
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
COMPRESSOR
RLA
12.9
15.0
16.7
10.9
5.4
20.0
13.9
6.8
26.4
15.0
8.2
32.1
19.3
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
OUTDOOR- INDOORFAN
FAN
MOTOR
MOTOR
FLA
FLA
1.4
2.0
1.4
2.6
1.4
2.8
1.4
2.8
0.8
1.4
1.4
3.1
1.4
3.1
0.8
1.6
1.4
7.2
1.4
7.2
0.8
2.3
2.1
7.2
2.1
7.2
MCA
19.5
22.8
25.1
17.8
9.0
29.5
21.9
10.9
41.6
27.4
13.4
49.4
33.4
MOCP*
30
30
30
25
10
45
30
15
60
40
20
60
50
AWG 60C MAX WIRE
MIN WIRE LENGTH
(ft)
SIZE
12
10
10
12
14
10
10
14
6
10
14
6
8
75
100
95
70
100
80
60
100
100
70
100
100
90
EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
452 + 464 + 455
Average Voltage =
3
1371
= 3
= 457
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
7
% Voltage Imbalance = 100 x
457
= 1.53%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
LEGEND
American Wire Gage
Breaker
Canadian Underwriters’ Laboratories
Full Load Amps
Heating, Air Conditioning and
Refrigeration
LRA
— Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
NEC
— National Electrical Code
RLA
— Rated Load Amps
*Fuse or HACR Breaker.
†Carrier Scroll Compressor.
**Copeland Scroll Compressor.
AWG
BRKR
CUL
FLA
HACR
POWER SUPPLY
—
—
—
—
—
NOTES:
1. In compliance with NEC requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the
overcurrent protective device for the unit shall be fuse or HACR
breaker. The 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, determine size from NEC.
3. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is greater than 2%. Use the following formula to determine
the percentage of voltage imbalance.
% Voltage Imbalance
max voltage deviation from average voltage
= 100 x
average voltage
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
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 (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 thermostat as
shown in Fig. 31-34.
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 default selections are preset.
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.
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
(KNOCKOUT)
3. Save the wirenut.
4. Connect the red lead to the contactor terminal from which
the orange lead was disconnected.
2″ DIA.
1 1/8″ DIA.
5. Using the wirenut removed from the red lead, insulate
the loose terminal on the orange lead.
1 3/8″ DIA.
2″ DIA.
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 Adjustments 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 — Indoor Fan On
JW — Jumper Wire
Fig. 32 — Easy Select Interface Board
LEGEND
C
COM
CTD
FU
HR
ICM
IFO
PL
TRAN
—
—
—
—
—
—
—
—
—
Contactor, Compressor
Common
Compressor Time Delay
Fuse
Heater Relay
Integrated Control Motor
Indoor Fan On
Plug
Transformer
Field Splice
Terminal (Marked)
Terminal (Unmarked)
Terminal Block
Splice
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To Represent Common Potential Only.
Not to Represent Wiring
Fig. 33 — Units 50SX048,060 — 208/230-1-60, Integrated Control Motor Wiring Schematic
25
C
COM
CTD
FU
HR
ICM
IFO
PL
TRAN
—
—
—
—
—
—
—
—
—
LEGEND
Contactor, Compressor
Common
Compressor Time Delay
Fuse
Heater Relay
Integrated Control Motor
Indoor Fan On
Plug
Transformer
Field Splice
Terminal (Marked)
Terminal (Unmarked)
Terminal Block
Splice
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To Indicate Common Potential Only.
Not to Represent Wiring
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. Follow recognized safety practices and wear protective goggles when checking or servicing refrigerant
system.
2. Do not operate compressor or provide any electric
power to unit unless compressor terminal cover is in
place and secured.
3. Do not remove compressor terminal cover until all
electrical sources are disconnected.
4. Relieve all pressure from both high- and lowpressure sides of the system before touching or disturbing anything inside terminal box if refrigerant leak
is suspected around compressor terminals. Use accepted methods to recover refrigerant.
5. Never attempt to repair soldered connection while refrigerant system is under pressure.
6. Do not use torch to remove any component. System
contains oil and refrigerant under pressure. To remove a component, wear protective goggles and proceed as follows:
a. Shut off electrical power to unit.
b. Relieve all pressure from system using both highand low-pressure ports. Use accepted methods to
recover refrigerant.
c. Cut component connecting tubing with tubing cutter and remove component from unit.
d. Carefully unsweat remaining tubing stubs when
necessary. Oil can ignite when exposed to torch
flame.
1. Remove all access panels.
2. Read and follow instructions on all WARNING, CAUTION, and INFORMATION labels attached to, or shipped
with, unit.
Make the following inspections:
a. Inspect for shipping and handling damages such as broken lines, loose parts, disconnected wires, etc.
b. Inspect for oil at all refrigerant tubing connections and
on unit base. Detecting oil generally indicates a refrigerant leak. Leak-test all refrigerant tubing connections using electronic leak detector, or liquid-soap solution. 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 handling, carefully straighten fins with a fin comb.
3. Verify the following conditions:
a. Make sure that outdoor-fan blade is correctly positioned in fan orifice. Leading edge of blade should be
2 in. back from condenser inlet grille or 1⁄2 in. maximum from fan deck.
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
3. When using an automatic changeover room thermostat,
place both SYSTEM and FAN switches in AUTO. positions. Observe that unit operates in Cooling mode when
temperature control is set to ‘‘call for cooling’’ (below
room temperature).
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 energize the electrical disconnect to the unit.
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 orientation. If not corrected within 5 minutes, the internal protector will shut off the compressor. The
3-phase power leads to the unit must be reversed to
correct rotation. When turning backwards, scroll compressors emit elevated noise levels, and the difference 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.
CHECKING AND ADJUSTING REFRIGERANT CHARGE
— The refrigerant system is fully charged with R-22 refrigerant, and is tested and factory sealed.
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 Temperature (F)’’ chart.
An accurate superheat, thermocouple-, or thermistor-type
thermometer, a sling psychrometer, and a gage manifold are
required when using the superheat charging method for evaluating the unit charge. Do not use mercury or small dial-type
thermometers, because they are not adequate for this type of
measurement.
3. Check system for leaks using an approved method.
4. Evacuate refrigerant system and reclaim refrigerant if no
additional leaks are found.
5. Charge unit with R-22 refrigerant, using a volumetriccharging cylinder or accurate scale. Refer to unit rating
plate for required charge. Be sure to add extra refrigerant
to compensate for internal volume of filter drier.
Start-Up Cooling Section and Make
Adjustments
Complete the required procedures given in the PreStart-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 temperature is below 40 F (unless accessory low-ambient
kit is installed).
Do not rapid-cycle the compressor. Allow 5 minutes between ‘‘on’’ cycles to prevent compressor damage.
When evaluating the refrigerant charge, an indicated adjustment to the specified factory charge must always be
very minimal. If a substantial adjustment is indicated,
an abnormal condition exists somewhere in the cooling
system, such as insufficient airflow across either coil or
both coils.
Proceed as follows:
1. Remove caps from low- and high-pressure service
fittings.
2. Using hoses with valve core depressors, attach low- and
high-pressure gage hoses to low- and high-pressure service fittings, respectively.
3. Start unit in cooling mode and let unit run until system
pressures stabilize.
4. Measure and record the following:
a. Outdoor ambient-air temperature (F db).
b. Evaporator inlet-air temperature (F wb).
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 temperature. Observe that compressor, condenser fan, and evaporator blower motors start. Observe that cooling cycle shuts
down when control setting is satisfied.
27
c. Suction-tube temperature (F) at low-side service
fitting.
d. Suction (low-side) pressure (psig).
5. Using ‘‘Superheat Charging Table,’’ compare outdoor-air
temperature (F db) with evaporator inlet-air temperature
(F wb) to determine desired system operating superheat
temperature. See Tables 5A-5I and 6A-6F.
6. Using ‘‘Required Suction-Tube Temperature (F)’’
table, compare desired superheat temperature with suction (low-side) operating pressure (psig) to determine proper
suction-tube temperature. See Table 7.
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 refrigerant if actual temperature is more than 3° F lower than
required suction-tube temperature.
NOTE: If the problem causing the inaccurate readings is a
refrigerant leak, refer to Check for Refrigerant Leaks section on page 27.
Table 5A — Superheat Charging Table, 50SS018
TEMP (F)
AIR ENT
COND
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
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
*
*
*
*
EVAP AIR — CFM
600
Evap Air — Ewb (F)
64
66
27.7
28.5
24.1
25.7
20.6
22.9
17.0
20.1
13.5
17.3
11.4
15.2
9.4
13.2
7.3
11.1
5.3
9.1
*
6.7
*
*
68
29.3
27.3
25.2
23.1
21.1
19.0
17.0
14.9
12.9
10.8
8.8
70
29.3
27.3
25.2
23.9
22.6
20.5
18.5
17.2
15.9
13.8
11.8
72
29.3
27.3
25.2
24.1
24.1
22.0
20.0
19.5
18.9
16.8
14.8
74
29.3
27.3
25.2
25.4
25.6
23.5
21.5
21.7
21.9
19.8
17.8
76
29.3
27.3
25.2
26.1
27.1
25.0
23.0
24.0
24.9
22.8
20.8
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
LEGEND
Ewb — Entering Wet Bulb
SPH — Superheat at Compressor (F)
Table 5B — Superheat Charging Table, 50SS024
TEMP (F)
AIR ENT
COND
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
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
*
*
LEGEND
Ewb — Entering Wet Bulb
SPH — Superheat at Compressor (F)
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
7.6
5.5
*
EVAP AIR — CFM
800
Evap Air — Ewb (F)
64
66
24.2
25.1
22.1
23.0
20.1
21.0
18.0
19.7
16.0
18.4
13.9
16.3
11.9
14.3
9.9
12.2
7.8
10.2
5.8
8.1
*
6.1
68
25.9
23.9
21.8
21.3
20.7
18.7
16.6
14.6
12.5
10.5
8.4
70
26.6
24.9
23.3
22.4
21.5
19.9
18.2
16.6
14.9
13.3
11.6
72
27.2
26.0
24.8
23.5
22.3
21.0
19.8
18.6
17.3
16.1
14.9
74
27.9
27.1
26.2
24.6
23.1
22.2
21.4
20.6
19.7
18.9
18.1
76
28.6
28.1
27.7
25.8
23.8
23.4
23.0
22.6
22.1
21.7
21.3
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
28
Table 5C — Superheat Charging Table, 50SS030
TEMP (F)
AIR ENT
COND
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
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
*
*
LEGEND
Ewb — Entering Wet Bulb
SPH — Superheat at Compressor (F)
60
17.1
15.0
13.0
10.9
8.9
8.3
7.8
7.3
6.7
*
*
62
19.2
17.1
15.1
13.6
12.0
10.9
9.9
9.3
8.8
6.7
*
EVAP AIR — CFM
1000
Evap Air — Ewb (F)
64
66
21.3
23.3
19.2
21.3
17.2
19.2
16.1
18.7
15.1
18.2
13.6
16.2
12.0
14.1
11.4
13.6
10.9
13.0
8.9
10.9
6.8
8.9
68
24.7
22.8
20.9
20.1
19.2
17.7
16.1
15.6
15.0
13.0
10.9
70
25.9
24.2
22.6
21.4
20.2
19.2
18.2
17.6
17.1
15.0
13.0
72
27.2
25.7
24.2
22.7
21.2
20.8
20.2
19.7
19.1
17.1
15.0
74
27.8
26.3
24.8
23.6
22.4
21.6
20.9
20.2
19.4
18.0
16.5
76
28.5
26.9
25.4
24.4
23.5
22.5
21.7
20.7
19.8
18.9
18.0
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Table 5D — Superheat Charging Table, 50SS036
TEMP (F)
AIR ENT
COND
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
54
8.4
5.0
*
*
*
*
*
*
*
*
*
56
8.4
5.0
*
*
*
*
*
*
*
*
*
58
8.4
5.0
*
*
*
*
*
*
*
*
*
LEGEND
Ewb — Entering Wet Bulb
SPH — Superheat at Compressor (F)
60
8.4
5.0
*
*
*
*
*
*
*
*
*
62
12.5
9.0
5.4
*
*
*
*
*
*
*
*
EVAP AIR — CFM
1200
Evap Air — Ewb (F)
64
66
16.7
18.7
13.1
15.9
9.6
13.1
6.0
10.3
*
7.5
*
5.4
*
*
*
*
*
*
*
*
*
*
68
20.7
18.6
16.6
14.5
12.5
10.4
8.4
6.4
*
*
*
70
22.0
20.0
17.9
15.9
13.9
12.5
11.3
10.0
8.7
9.3
10.0
72
23.4
21.3
19.3
17.3
15.2
14.6
14.1
13.5
13.0
12.4
11.9
74
24.8
22.7
20.6
18.6
16.5
16.8
17.0
17.1
17.3
15.6
13.8
76
26.1
24.0
22.0
20.0
17.9
18.8
19.8
20.7
21.7
18.7
15.8
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Table 5E — Superheat Charging Table, 50SS042
TEMP (F)
AIR ENT
COND
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
54
11.0
7.5
*
*
*
*
*
*
*
*
*
56
11.0
7.5
*
*
*
*
*
*
*
*
*
58
11.0
7.5
*
*
*
*
*
*
*
*
*
60
14.0
10.4
6.9
5.9
5.0
*
*
*
*
*
*
62
17.0
13.4
9.9
8.4
6.9
6.0
*
*
*
*
*
EVAP AIR — CFM
1400
Evap Air — Ewb (F)
64
66
20.0
22.0
16.4
18.9
12.9
15.9
10.8
13.8
8.8
11.8
6.8
10.2
5.0
8.7
*
6.5
*
*
*
*
*
*
LEGEND
Ewb — Entering Wet Bulb
SPH — Superheat at Compressor (F)
29
68
24.0
21.4
18.9
16.8
14.8
13.7
12.7
10.5
8.4
8.0
7.7
70
26.0
24.0
21.9
19.8
17.8
17.3
16.7
14.6
12.6
12.0
11.5
72
26.0
25.0
23.2
21.3
19.5
18.6
17.8
16.4
15.1
14.2
13.4
74
27.7
26.1
24.4
22.8
21.1
20.0
18.9
18.2
17.6
16.4
15.3
76
28.6
27.1
25.7
24.3
22.8
21.4
20.0
20.0
20.0
18.6
17.2
Table 5F — Superheat Charging Table, 50SS048 (Carrier Scroll Compressor)
TEMP (F)
AIR ENT
COND
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
54
15.5
11.7
8.0
6.0
*
*
*
*
*
*
*
56
15.5
11.8
8.0
6.0
*
*
*
*
*
*
*
58
15.6
11.8
8.0
6.0
*
*
*
*
*
*
*
LEGEND
Ewb — Entering Wet Bulb
SPH — Superheat at Compressor (F)
60
15.6
11.8
8.0
6.0
*
*
*
*
*
*
*
62
17.6
13.9
10.2
8.7
7.2
5.6
*
*
*
*
*
EVAP AIR — CFM
1600
Evap Air — Ewb (F)
64
66
19.6
21.6
16.0
18.0
12.3
14.5
11.3
13.9
10.3
13.4
7.7
9.9
5.2
6.3
*
5.8
*
5.2
*
6.2
*
7.1
68
22.8
20.1
17.4
16.3
15.1
12.4
9.8
9.1
8.4
8.8
9.1
70
24.0
22.2
20.4
18.6
16.8
15.0
13.2
12.5
11.7
11.4
11.1
72
25.2
24.3
23.3
20.9
18.5
17.6
16.7
15.8
14.9
14.0
13.1
74
25.2
24.3
23.3
21.5
19.7
18.7
17.7
17.1
16.5
15.9
15.3
76
25.3
24.3
23.3
22.0
20.8
19.8
18.8
18.4
18.1
17.8
17.5
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Table 5G — Superheat Charging Table, 50SS048 (Copeland Scroll Compressor)
TEMP (F)
AIR ENT
COND
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
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
*
*
*
*
*
*
LEGEND
Ewb — Entering Wet Bulb
SPH — Superheat at Compressor (F)
60
19.0
15.4
11.9
8.4
5.0
*
*
*
*
*
*
62
21.7
18.1
14.6
11.0
7.5
*
*
*
*
*
*
EVAP AIR — CFM
1600
Evap Air — Ewb (F)
64
66
24.3
26.0
20.8
22.5
17.2
18.9
13.7
15.4
10.1
11.8
6.6
9.0
*
6.2
*
*
*
*
*
*
*
*
68
27.7
24.1
20.6
17.0
13.5
11.4
9.4
7.3
5.3
*
*
70
27.9
25.1
22.3
19.5
16.7
14.7
12.6
10.6
8.5
6.9
5.3
72
28.2
26.1
24.0
22.0
20.0
17.9
15.9
13.8
11.8
11.2
10.6
74
28.4
27.1
25.8
24.5
23.2
21.1
19.1
17.0
15.0
15.5
16.0
76
28.6
28.1
27.5
27.0
26.4
24.4
22.3
20.3
18.2
19.8
21.3
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Table 5H — Superheat Charging Table, 50SS060 (Carrier Scroll Compressor)
TEMP (F)
AIR ENT
COND
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
54
8.9
5.0
*
*
*
*
*
*
*
*
*
56
8.9
5.0
*
*
*
*
*
*
*
*
*
LEGEND
Ewb — Entering Wet Bulb
SPH — Superheat at Compressor (F)
58
9.0
5.0
*
*
*
*
*
*
*
*
*
60
9.0
5.0
*
*
*
*
*
*
*
*
*
62
12.1
7.4
*
*
*
*
*
*
*
*
*
EVAP AIR — CFM
1600
Evap Air — Ewb (F)
64
66
15.2
18.3
11.1
14.7
6.9
11.2
*
5.6
*
*
*
*
*
*
*
*
*
*
*
*
*
*
68
20.4
17.3
14.3
9.4
*
*
*
*
*
*
*
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
24.5
22.9
21.3
18.4
15.4
13.3
11.1
9.7
8.3
6.9
5.5
76
24.5
23.3
22.1
19.9
17.6
15.3
13.1
12.3
11.5
10.8
10.0
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
30
Table 5I — Superheat Charging Table, 50SS060 (Copeland Scroll Compressor)
TEMP (F)
AIR ENT
COND
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
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
*
*
*
*
LEGEND
Ewb — Entering Wet Bulb
SPH — Superheat at Compressor (F)
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
*
*
*
*
EVAP AIR — CFM
1995
Evap Air — Ewb (F)
64
66
20.1
22.6
18.0
20.6
16.0
18.5
13.9
16.5
11.9
14.4
9.9
12.4
7.8
10.3
5.8
8.3
*
6.2
*
*
*
*
68
25.2
23.1
21.1
19.0
17.0
14.9
12.9
10.8
8.8
6.7
*
70
25.6
24.0
22.3
20.6
18.9
17.3
15.6
13.9
12.3
10.6
8.9
72
26.1
24.8
23.5
22.2
20.9
19.6
18.3
17.0
15.7
14.4
13.1
74
26.6
25.6
24.7
23.8
22.9
22.0
21.1
20.1
19.2
18.3
17.4
76
27.0
26.5
25.9
25.4
24.9
24.3
23.8
23.2
22.7
22.2
21.6
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Table 6A — Superheat Charging Table, 50SX024
TEMP (F)
AIR ENT
COND
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
54
22.1
18.5
15.0
9.2
*
*
*
*
*
*
*
56
22.1
18.9
15.4
9.5
*
*
*
*
*
*
*
58
22.8
19.3
15.7
9.7
*
*
*
*
*
*
*
LEGEND
Ewb — Entering Wet Bulb
SPH — Superheat at Compressor (F)
60
23.2
19.6
16.1
9.9
*
*
*
*
*
*
*
62
25.3
22.2
19.2
14.4
9.6
7.2
*
*
*
*
*
EVAP AIR — CFM
800
Evap Air — Ewb (F)
64
66
27.4
29.5
24.8
27.5
22.3
25.4
18.9
23.3
15.5
21.3
12.5
17.8
9.4
14.2
7.1
10.6
*
7.1
*
*
*
*
68
29.8
28.3
26.7
24.7
22.6
20.1
17.5
14.5
11.4
8.4
5.3
70
30.2
29.1
28.1
26.0
24.0
22.4
20.9
18.3
15.8
13.2
10.7
72
30.5
30.0
29.4
27.3
25.3
24.8
24.2
22.1
20.1
18.0
16.0
74
31.3
30.0
28.7
27.4
26.1
25.1
24.2
22.9
21.6
19.5
17.5
76
32.1
30.0
28.0
27.4
26.8
25.5
24.2
23.6
23.1
21.0
19.0
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Table 6B — Superheat Charging Table, 50SX030
TEMP (F)
AIR ENT
COND
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
54
11.2
7.6
*
*
*
*
*
*
*
*
*
56
11.2
7.7
*
*
*
*
*
*
*
*
*
LEGEND
Ewb — Entering Wet Bulb
SPH — Superheat at Compressor (F)
58
11.2
7.7
*
*
*
*
*
*
*
*
*
60
11.2
7.7
*
*
*
*
*
*
*
*
*
62
14.9
12.1
9.4
8.5
7.6
*
*
*
*
*
*
EVAP AIR — CFM
1000
Evap Air — Ewb (F)
64
66
18.6
22.3
16.6
21.1
14.7
20.0
13.5
18.5
12.3
17.0
10.0
14.2
7.7
11.5
*
5.7
*
*
*
*
*
*
68
22.4
21.6
20.7
19.3
18.0
16.0
14.1
9.9
5.7
*
*
70
22.5
22.0
21.4
20.2
18.9
17.8
16.7
14.0
11.4
8.9
*
72
22.7
22.4
22.1
21.0
19.9
19.6
19.2
18.2
17.1
13.5
10.0
74
22.9
22.5
22.1
21.6
21.1
20.7
20.2
19.4
18.6
15.8
13.0
76
23.1
22.5
22.0
22.1
22.3
21.8
21.2
20.6
20.1
18.0
16.0
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
31
Table 6C — Superheat Charging Table, 50SX036
TEMP (F)
AIR ENT
COND
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
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
*
*
*
*
*
LEGEND
Ewb — Entering Wet Bulb
SPH — Superheat at Compressor (F)
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
*
*
*
*
EVAP AIR — CFM
1200
Evap Air — Ewb (F)
64
66
22.6
23.3
21.2
22.2
19.7
21.0
16.6
18.0
13.4
15.0
11.2
13.5
9.0
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
23.8
22.6
21.4
19.3
17.3
16.8
16.2
14.1
12.1
10.0
8.0
74
23.3
22.0
20.7
19.4
18.1
17.2
16.2
14.9
13.6
11.5
9.5
76
22.8
21.5
20.1
19.5
19.0
17.6
16.2
15.6
15.1
13.0
11.0
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Table 6D — Superheat Charging Table, 50SX042
TEMP (F)
AIR ENT
COND
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
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
*
*
*
*
LEGEND
Ewb — Entering Wet Bulb
SPH — Superheat at Compressor (F)
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
*
*
*
*
EVAP AIR — CFM
1400
Evap Air — Ewb (F)
64
66
24.9
25.5
22.9
23.4
20.8
21.3
19.6
21.3
18.4
21.3
14.9
17.8
11.3
14.2
8.0
10.6
*
7.1
*
*
*
*
68
25.8
23.7
21.7
21.5
21.3
18.7
16.2
13.1
10.1
7.0
*
70
26.1
24.1
22.0
21.7
21.3
19.7
18.2
15.6
13.1
10.5
8.0
72
26.5
24.5
22.4
21.8
21.3
20.8
20.2
18.1
16.1
14.0
12.0
74
25.6
24.0
22.4
21.8
21.3
20.8
20.2
18.9
17.6
15.5
13.5
76
24.7
23.5
22.4
21.8
21.3
20.8
20.2
19.6
19.1
17.0
15.0
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Table 6E — Superheat Charging Table, 50SX048
TEMP (F)
AIR ENT
COND
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
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
*
*
*
*
LEGEND
Ewb — Entering Wet Bulb
SPH — Superheat at Compressor (F)
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
*
*
*
EVAP AIR — CFM
1600
Evap Air — Ewb (F)
64
66
26.7
26.5
24.6
24.5
22.5
22.4
20.4
20.3
18.3
18.3
15.2
16.3
12.2
14.2
8.4
10.6
*
7.1
*
*
*
*
68
26.0
24.5
22.9
21.4
19.8
17.8
15.7
12.9
10.1
7.1
*
70
25.6
24.5
23.5
22.4
21.4
19.3
17.3
15.2
13.1
10.5
8.0
72
25.1
24.6
24.0
23.5
22.9
20.9
18.8
17.5
16.1
14.0
12.0
74
24.5
23.8
23.1
22.4
21.8
20.4
19.0
18.1
17.1
15.3
13.5
76
24.0
23.1
22.2
21.4
20.6
19.9
19.2
18.7
18.2
16.6
15.0
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
32
Table 6F — Superheat Charging Table, 50SX060
TEMP (F)
AIR ENT
COND
65
70
75
80
85
90
95
100
105
110
115
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
SPH
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
*
*
*
*
LEGEND
Ewb — Entering Wet Bulb
SPH — Superheat at Compressor (F)
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
*
*
*
*
EVAP AIR — CFM
1995
Evap Air — Ewb (F)
64
66
20.1
22.6
18.0
20.6
16.0
18.5
13.9
16.5
11.9
14.4
9.9
12.4
7.8
10.3
5.8
8.3
*
6.2
*
*
*
*
68
25.2
23.1
21.1
19.0
17.0
14.9
12.9
10.8
8.8
6.7
*
70
25.6
24.0
22.3
20.6
18.9
17.3
15.6
13.9
12.3
10.6
8.9
72
26.1
24.8
23.5
22.2
20.9
19.6
18.3
17.0
15.7
14.4
13.1
74
26.6
25.6
24.7
23.8
22.9
22.0
21.1
20.1
19.2
18.3
17.4
76
27.0
26.5
25.9
25.4
24.9
24.3
23.8
23.2
22.7
22.2
21.6
*Do not attempt to charge system under these conditions — refrigerant slugging may occur.
Table 7 — Required Suction-Tube Temperature (F)*
SUPERHEAT
TEMP (F)
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
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
SUCTION PRESSURE AT SERVICE PORT (psig)
67.1
70.0
73.0
76.0
79.2
39
41
43
45
47
41
43
45
47
49
43
45
47
49
51
45
47
49
51
53
47
49
51
53
55
49
51
53
55
57
51
53
55
57
59
53
55
57
59
61
55
57
59
61
63
57
59
61
63
65
59
61
63
65
67
61
63
65
67
69
63
65
67
69
71
65
67
69
71
73
67
69
71
73
75
69
71
73
75
77
71
73
75
77
79
73
75
77
79
81
75
77
79
81
83
77
79
81
83
85
79
81
83
85
87
*Temperature at suction service valve.
33
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
AUX HEAT RANGE (VIO)
NOTE: If no heater is installed, this step can be omitted.
The airflow for electric heat is selected with the AUX HEAT
RANGE terminals. Refer to Table 3 and the installation instructions for electric heaters for minimum airflow required
for safe heater operation. Refer to table below for the available airflows. Each select pin is configured for a certain airflow. 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.
INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS
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 pressures. 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.
NOTE: Be sure that all supply- and return-air grilles are open,
free from obstructions, and adjusted properly.
TERMINAL
Available
Airflow (Cfm)
1
2
3
4
1365
1470
1680
1840
AC/HP SIZE (BLU) — The preset factory default selection
for AC/HP SIZE (air conditioner/heat pump) is set to
400 cfm/ton. The selection pins are configured for 350 cfm/
ton and 400 cfm/ton.
TYPE (ORN) — The TYPE is a preset factory default selection. The preset factory default setting is AC for the 50SX
units. Default setting should not be altered.
AC/HP CFM ADJUST (BLK) — The preset factory default
selection is MED. Selections HI and LO will adjust the airflow 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.
Disconnect electrical power to the unit before changing
blower speed. Electrical shock can cause personal injury or death.
Airflow can be changed by changing the lead connections
of the blower motor.
Unit 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.
MODE
For 208/230-v and A.O. Smith 460-v Blower Motors:
The motor leads are color-coded as follows:
3-SPEED
2-SPEED
black = high speed
black = high speed
blue = medium speed
red = low speed
red = low speed
LO - Adjust
HI - Adjust
FAN
ONLY
−15%
15%
COOLING
HEATING
−10%
10%
−10%
10%
AC/HP TIME DELAY (GRY) — Four motor operation delay
options are provided to customize system operation. See listing 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
30-Sec On/60-Sec
Off Delay
Profile (Terminal 1)
For 460-v GE Motors:
The motor leads are color coded as follows:
3-SPEED
2-SPEED
black = high
black = high
blue = jumper
blue = jumper
orange = medium
red = low
red
= low
No Delay Option
(Terminal 2)
30-Sec Off Delay
(Terminal 3)
45-Sec Off Delay
(Terminal 4)
DESCRIPTION
Used when it is desirable to allow system
coils time to heat up or cool down prior to
airflow.
Used for servicing or when other components are used to perform the delay
function.
Preset factory default setting for 50SX
units.
Enhances system efficiency.
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 temperature 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 continuity tester.
34
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’’ terminal and the evaporator fan remains energized for the delay 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 compressor 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: 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.
SEQUENCE OF OPERATION — STD NON-ICM UNITS
Cooling
NOTE: With the FAN switch in the ON position, 24 v is
supplied to the IFR through the G terminal on the thermostat. 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 supplying power to both the compressor and outdoor (condenser) 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 supplying power to compressor/OFM and IFM.
Heating — If accessory electric heaters are installed, on a
call for heat, circuit R-W is made through the thermostat contacts. 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 thermostat 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
UNIT
SIZE
MOTOR
SPEED
Low
018
High
Low
024
Med
High
Low
030
Med
High
Low
036
Med
High
Low
042
High
Low
048
High
Low
060
High
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
Watts
Cfm
0.0
230
760
—
—
280
820
365
1025
—
—
—
—
—
—
—
—
470
1280
550
1500
—
—
730
1620
—
—
1080
2100
1230
2390
1150
2500
—
—
0.1
225
745
—
—
275
810
360
1010
—
—
460
1240
—
—
—
—
460
1250
535
1450
—
—
700
1590
—
—
1040
2090
1190
2340
1100
2410
—
—
0.2
220
725
—
—
265
755
350
975
490
1300
450
1190
—
—
—
—
455
1230
520
1400
—
—
680
1550
—
—
1020
2080
1125
2280
1050
2330
—
—
230 AND 460 V HORIZONTAL DISCHARGE
External Static Pressure (in. wg)
0.3
0.4
0.5
0.6
0.7
210
195
170
—
—
695
640
540
—
—
—
270
235
200
—
—
850
700
450
—
255
250
245
240
—
700
660
600
560
—
345
340
330
320
310
940
900
850
800
720
480
470
460
445
430
1255
1200
1150
1080
1005
420
400
380
360
335
1125
1060
995
920
840
480
460
435
410
375
1280
1200
1115
1020
910
—
—
560
530
510
—
—
1270
1180
1080
445
430
415
400
380
1200
1150
1100
1050
980
500
480
460
440
410
1330
1270
1190
1120
1030
—
625
595
550
520
—
1540
1440
1325
1220
645
615
580
535
490
1510
1460
1390
1310
1210
—
—
850
800
750
—
—
1780
1670
1550
970
910
840
785
730
2060
1980
1900
1810
1710
1060
1010
940
880
820
2210
2150
2030
1900
1770
1010
950
900
850
800
2260
2170
2080
1990
1880
—
—
1170
1110
1050
—
—
2470
2340
2200
0.8
—
—
—
—
—
—
300
630
410
915
—
—
—
—
490
1000
350
890
385
940
500
1110
430
1050
700
1400
680
1590
760
1630
730
1750
990
2040
0.9
—
—
—
—
—
—
—
—
390
790
—
—
—
—
460
870
—
—
—
—
470
1000
—
—
650
1230
620
1450
710
1480
650
1580
920
1870
1.0
—
—
—
—
—
—
—
—
380
620
—
—
—
—
—
—
—
—
—
—
425
800
—
—
610
1050
540
1200
660
1300
—
—
880
1700
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.
2. Dashes indicate portions of table that are beyond the blower motor capacity or are not recommended.
*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.
36
Table 9 — Dry Coil Air Delivery* — Vertical Discharge (Deduct 10% for 208 v) — Unit 50SS
UNIT
SIZE
MOTOR
SPEED
Low
018
High
Low
024
Med
High
Low
030
Med
High
Low
036
Med
High
Low
042
High
Low
048
High
Low
060
High
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
Watts
Cfm
0.0
230
760
—
—
280
820
365
1025
—
—
—
—
—
—
—
—
470
1280
550
1500
—
—
730
1620
—
—
1080
2100
1230
2390
890
2500
—
—
0.1
225
745
—
—
275
810
360
1010
—
—
460
1240
—
—
—
—
460
1250
535
1450
—
—
700
1590
—
—
1040
2090
1190
2340
850
2410
—
—
0.2
220
725
—
—
265
755
350
975
490
1300
450
1190
—
—
—
—
455
1230
520
1400
—
—
680
1550
—
—
1020
2080
1125
2280
810
2330
—
—
230 AND 460 V VERTICAL DISCHARGE
External Static Pressure (in. wg)
0.3
0.4
0.5
0.6
0.7
210
195
170
—
—
695
640
540
—
—
—
270
235
200
—
—
850
700
450
—
255
250
245
240
—
700
660
600
560
—
345
340
330
320
310
940
900
850
800
720
480
470
460
445
430
1255
1200
1150
1080
1005
420
400
380
360
335
1125
1060
995
920
840
480
460
435
410
375
1280
1200
1115
1020
910
—
—
560
530
510
—
—
1270
1180
1080
445
430
415
400
380
1200
1150
1100
1050
980
500
480
460
440
410
1330
1270
1190
1120
1030
—
625
595
550
520
—
1540
1440
1325
1220
645
615
580
535
490
1510
1460
1390
1310
1210
—
—
850
800
750
—
—
1780
1670
1550
970
910
840
785
730
2060
1980
1900
1810
1710
1060
1010
940
880
820
2210
2150
2030
1900
1770
780
740
710
660
630
2260
2170
2080
1970
1860
1000
960
910
870
830
2480
2370
2250
2120
2000
0.8
—
—
—
—
—
—
300
630
410
915
—
—
—
—
490
1000
350
890
385
940
500
1110
430
1050
700
1400
680
1590
760
1630
580
1700
790
1850
0.9
—
—
—
—
—
—
—
—
390
790
—
—
—
—
460
870
—
—
—
—
470
1000
—
—
650
1230
620
1450
710
1480
—
—
750
1690
1.0
—
—
—
—
—
—
—
—
380
620
—
—
—
—
—
—
—
—
—
—
425
800
—
—
610
1050
540
1200
660
1300
—
—
—
—
Table 10 — Dry-Coil Air Delivery* — Horizontal Discharge (Deduct 10% for 208 V) — Unit 50SX
UNIT
50SX
MOTOR
SPEED
Low
024,
030
Med
High
Low
036
Med
High
Low
042
Med
High
Low
048†
High
AIR
DELIVERY
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
0.0
280
820
365
1025
—
—
520
1375
575
1520
—
—
490
1400
590
1600
—
—
1050
1850
—
—
0.1
275
810
360
1010
—
—
495
1335
560
1490
—
—
480
1380
580
1560
—
—
1000
1830
—
—
0.2
265
755
350
975
490
1300
474
1290
535
1450
—
—
470
1340
560
1540
—
—
970
1800
—
—
230 AND 460 VOLT HORIZONTAL DISCHARGE
External Static Pressure (in. wg)
0.3
0.4
0.5
0.6
0.7
255
250
245
240
—
700
660
600
560
—
345
340
330
320
310
940
900
850
800
720
480
470
460
445
430
1255
1200
1150
1080
1005
458
445
425
—
—
1240
1200
1140
—
—
510
480
460
440
425
1400
1380
1300
1200
1080
—
650
614
575
540
—
1560
1500
1380
1280
460
450
430
410
390
1300
1250
1200
1140
1070
545
525
505
480
450
1470
1430
1360
1300
1220
—
—
700
670
640
—
—
1780
1670
1600
930
870
810
750
680
1785
1750
1700
1640
1500
1050
1000
930
870
810
2000
1940
1850
1750
1635
LEGEND AND NOTES FOR TABLES 9 AND 10
*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.
†Size 048 is 460 v.
0.8
—
—
300
630
410
915
—
—
—
—
510
1170
—
—
420
1120
600
1480
600
1330
740
1500
0.9
—
—
—
—
390
790
—
—
—
—
480
1060
—
—
—
—
560
1340
—
—
665
1300
1.0
—
—
—
—
380
620
—
—
—
—
—
—
—
—
—
—
500
1100
—
—
—
—
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. Evaporatorcoil frosting may occur at airflows below this point.
2. Dashes indicate portions of the table that are beyond the blower
motor capacity or are not recommended.
37
Table 11 — Dry-Coil Air Delivery* — Vertical Discharge (Deduct 10% for 208 V) — Unit 50SX
UNIT
SIZE
50SX
MOTOR
SPEED
Low
024,
030
Med
High
Low
036
Med
High
Low
042
Med
High
Low
048†
High
AIR
DELIVERY
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
0.0
280
820
365
1025
—
—
520
1375
575
1520
—
—
490
1400
590
1600
—
—
1050
1850
—
—
0.1
275
810
360
1010
—
—
495
1335
560
1490
—
—
480
1380
580
1560
—
—
1000
1830
—
—
0.2
265
755
350
975
490
1300
474
1290
535
1450
—
—
470
1340
560
1540
—
—
970
1800
—
—
230 AND 460 VOLT VERTICAL DISCHARGE
External Static Pressure (in. wg)
0.3
0.4
0.5
0.6
0.7
255
250
245
240
—
700
660
600
560
—
345
340
330
320
310
940
900
850
800
720
480
470
460
445
430
1255
1200
1150
1080
1005
458
445
425
—
—
1240
1200
1140
—
—
510
480
460
440
425
1400
1380
1300
1200
1080
—
650
614
575
540
—
1560
1500
1380
1280
460
450
430
410
390
1300
1250
1200
1140
1070
545
525
505
480
450
1470
1430
1360
1300
1220
—
—
700
670
640
—
—
1780
1670
1600
930
870
810
750
680
1785
1750
1700
1640
1500
1050
1000
930
870
810
2000
1940
1850
1750
1635
*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.
†Size 048 is 460 v.
048
060
FAN ONLY
(Cfm)
1400
1750
0.9
—
—
—
—
390
790
—
—
—
—
480
1060
—
—
—
—
560
1340
—
—
665
1300
1.0
—
—
—
—
380
620
—
—
—
—
—
—
—
—
—
—
500
1100
—
—
—
—
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.
2. Dashes indicate portions of table that are beyond the blower motor capacity or are not recommended.
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
0.8
—
—
300
630
410
915
—
—
—
—
510
1170
—
—
420
1120
600
1480
600
1330
740
1500
COOLING
(Cfm)
1600
2000
*Air delivery values are for dry coil at 230 v. Airflow is independent of
external static pressure within 65% of table values up to
0.8 in. wg.
NOTE: Do not operate the unit at a cooling airflow that is less than
350 cfm for each 12,000 Btuh of rated cooling capacity. Evaporatorcoil icing may occur at airflows below this point. Water blow-off may
occur at airflows above 450 cfm per 12,000 Btuh of rated cooling
capacity.
38
Table 13 — Wet Coil Pressure Drop
AIRFLOW
(cfm)
600
700
800
900
600
700
800
900
900
1000
1200
1000
1200
1400
1600
1000
1200
1400
1600
1400
1600
1800
1700
1900
2100
2300
UNIT SIZE
018*
024
030
036
042
048
060
PRESSURE DROP
(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
*Unit 50SS only.
Table 14 — Accessory Electric Heater Pressure Drop (in. wg)
HEATER
kW
5-20
600
0.030
800
0.033
1000
0.037
1200
0.042
CFM
1400
0.047
1600
0.052
1800
0.060
2000
0.067
2200
0.075
Table 15 — Filter Pressure Drop (in. wg)
UNIT
SIZE
50SS
018, 024
030, 036
042
048, 060
FILTER
CFM
SIZE
500
600
700
800
900
1000
1100
1200
1300
1400
1500 1600 1700 1800 1900 2000 2100 2200 2300
(in.)
20 x 20 0.05 0.07 0.08 0.10 0.12 0.13 —
—
—
—
—
—
—
—
—
—
—
—
—
20 x 24 —
—
—
—
— 0.10 0.11 0.13 0.14
—
—
—
—
—
—
—
—
—
—
24 x 24 —
—
—
—
—
—
—
—
0.11 0.12 0.14 0.15
—
—
—
—
—
—
—
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
500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300
50SX
(in.)
024-036 24 x 24 — — 0.06 0.06 0.07 0.07 0.08 0.09 0.10
—
—
—
—
—
—
—
—
—
—
042-060 24 x 30 — —
—
—
—
—
—
—
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 require 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 maintenance must be performed on this equipment. This cooling
unit should be inspected at least once each year by a qualified service person. To troubleshoot cooling of units, refer to
Troubleshooting chart in back of book.
Only qualified service personnel should perform maintenance 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.
4. Carefully replace and secure unit top to unit, using screws
removed in Steps 1 and 2, when maintenance and/or service procedures are completed.
NOTE TO EQUIPMENT OWNER: Consult your local dealer
about the availability of a maintenance contract.
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 WARNING COULD RESULT IN SERIOUS PERSONAL INJURY AND POSSIBLE DAMAGE TO THIS EQUIPMENT.
Evaporator Blower and Motor
NOTE: Motors without oilers are prelubricated. Do not attempt to lubricate these motors.
For longer life, operating economy, and continuing efficiency, clean accumulated dirt and grease from the blower
wheel and motor annually.
The minimum maintenance requirements for this equipment are as follows:
1. Inspect air filter(s) each month. Clean or replace when
necessary.
2. Inspect indoor coil, drain pan, and condensate drain each
cooling season for cleanliness. Clean when necessary.
3. Inspect blower motor and wheel for cleanliness and check
lubrication each cooling season. Clean and lubricate (if
required) when necessary. For first heating season, inspect blower wheel bimonthly to determine proper cleaning frequency.
4. Check electrical connections for tightness and controls
for proper operation each cooling season. Service when
necessary.
Lubricate the motor every 5 years if the motor is used intermittently (thermostat FAN switch in AUTO. position), or
every 2 years if the motor is used continuously (thermostat
FAN switch in ON position).
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.
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.
e. Replace dust caps or plugs in oil ports.
3. Remove and clean blower wheel as follows:
a. Ensure proper reassembly by marking wheel orientation and cutoff plate location.
b. Remove screws holding cut-off plate, and remove plate
from housing.
Failure to follow these warnings could result in serious
personal injury:
1. Turn off electrical power to the unit before performing any maintenance or service on the unit.
2. Use extreme caution when removing panels and parts.
As with any mechanical equipment, personal injury
can result from sharp edges.
3. Never place anything combustible either on, or in contact with, the unit.
Air Filter
Never operate the unit without a suitable air filter in the
return-air duct system. Always replace the filter with the
same dimensional size and type as originally installed.
See Tables 1 and 2 for recommended filter sizes.
Inspect air filter(s) at least once each month and replace
(throwaway-type) or clean (cleanable-type) at least twice during each 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.
Unit Top Removal
NOTE: When performing maintenance or service procedures that require removal of the unit top, be sure to
40
c. Lift wheel from housing. When handling and/or cleaning 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 attachment. 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 Condensate Drain Pan — Inspect the condenser coil, evaporator 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 season. Remove all obstructions (including weeds and shrubs)
that interfere with the airflow through the condenser coil.
Straighten bent fins with a fin comb. If coated with dirt or
lint, clean the coils with a vacuum cleaner, using 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, replace all the panels. Start the unit, and observe at least one
complete cooling cycle to ensure proper operation. If discrepancies 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 inspecting the coils. Clean the drain pan and condensate drain
by removing all foreign matter from the pan. Flush the pan
and drain tube with clear water. Do not splash water on the
insulation, motor, wiring, or air filter(s). If the drain tube is
restricted, clear it with a ‘‘plumbers snake’’ or similar probe
device. Ensure that the auxiliary drain port above the drain
tube is also clear.
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 connections 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 suspected, leak-test all refrigerant tubing using an electronic leakdetector, 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 ensure 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 performance is suspected, refer to Checking and Adjusting Refrigerant 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.
4. When replacing fan blade, position blade so that leading 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.
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.
Metering Devices — Refrigerant metering devices are
fixed orifices and are located in the inlet header to the evaporator 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
Compressor and condenser fan will not
start.
Compressor will not
start but condenser
fan runs.
Three-phase scroll
compressor
(50SS048, 060;
50SX036-060
units only) makes excessive noise, and
there may be a low
pressure differential.
Compressor cycles
(other than normally
satisfying thermostat).
Compressor operates
continuously.
Excessive head
pressure.
Head pressure too low.
Excessive suction
pressure.
Suction pressure too
low.
CAUSE
Power failure
Fuse blown or circuit breaker tripped
Defective thermostat, contactor, transformer,
or control relay
Insufficient line voltage
Incorrect or faulty wiring
Thermostat setting too high
Single-phase units with scroll compressor
(50SS048,060 and 50SX) have a 5-minute time delay
Faulty wiring or loose connections in
compressor circuit
Compressor motor burned out, seized, or
internal overload open
Defective run/start capacitor, overload,
or start relay
One leg of 3-phase power dead
Scroll compressor is rotating in the
wrong direction
Refrigerant overcharge or undercharge
Defective compressor
Insufficient line voltage
Blocked condenser
Defective run/start capacitor, overload
or start relay
Defective thermostat
Faulty condenser-fan motor or capacitor
Restriction in refrigerant system
Dirty air filter
Unit undersized for load
Thermostat set too low
Low refrigerant charge
Leaking valves in compressor
Air in system
Condenser coil dirty or restricted
Dirty air filter
Dirty condenser coil
Refrigerant overcharged
Air in system
Condenser air restricted or air short-cycling
Low refrigerant charge
Compressor valves leaking
Restriction in liquid tube
High heat load
Compressor valves leaking
Refrigerant overcharged
Dirty air filter
Low refrigerant charge
Metering device or low side restricted
Insufficient evaporator airflow
Temperature too low in conditioned area
Outdoor ambient below 40 F
Field-installed filter-drier restricted
42
REMEDY
Call power company.
Replace fuse or reset circuit breaker.
Replace component.
Determine cause and correct.
Check wiring diagram and rewire correctly.
Lower thermostat setting below room temperature.
DO NOT bypass this compressor time delay — wait
for 5 minutes until time-delay relay is deenergized.
Check wiring and repair or replace.
Determine cause. Replace compressor.
Determine cause and replace.
Replace fuse or reset circuit breaker.
Determine cause.
Correct the direction of rotation by reversing the
3-phase power leads to the unit.
Reclaim refrigerant, evacuate system, and recharge
to capacities shown on nameplate.
Replace and determine cause.
Determine cause and correct.
Determine cause and correct.
Determine cause and replace.
Replace thermostat.
Replace.
Locate restriction and remove.
Replace filter.
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.
Clean coil.
Reclaim excess refrigerant.
Reclaim refrigerant, evacuate system and recharge.
Determine cause and correct.
Check for leaks, repair and recharge.
Replace compressor.
Remove restriction.
Check for source and eliminate.
Replace compressor.
Reclaim excess refrigerant.
Replace filter.
Check for leaks, repair and recharge.
Remove source of restriction.
Increase air quantity. Check filter — replace if
necessary.
Reset thermostat.
Install low-ambient kit.
Replace.
TROUBLESHOOTING COOLING CHART (cont)
SYMPTOM
Integrated control motor
(units 50SX048 208/230 v
and 50SX060)
IFM does not run.
Integrated control motor (units
50SX048 208/230 v
and 50SX060)
IFM runs when it should be off.
Integrated control motor (units
50SX048 208/230 v
and 50SX060)
IFM operation is intermittent.
CAUSE
Blower wheel not secured to shaft.
Insufficient voltage at motor
Power connectors not properly seated
Motor programmed with a delay profile
With thermostat in OFF the voltage on
G,Y1,Y/Y2,W with respect to common,
should be less than 1⁄2 of actual low
voltage supply
Water dripping into motor
REMEDY
Properly tighten blower wheel to shaft.
Determine cause and correct.
Connectors should snap easily; do not force.
Allow a few minutes for motor to shut off.
If measured voltage is more than 1⁄2, the thermostat is incompatible with motor. If voltage is
less than 1⁄2, the motor has failed.
Connectors not firmly seated
Gently pull wires individually to be sure they
are crimped into the housing.
IFM — Indoor (Evaporator) Fan Motor
43
Verify proper drip loops in connector wires.
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
• Maintenance
• Installation Overview
• 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 4
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
I. PRELIMINARY INFORMATION
MODEL NO.:
SERIAL NO.:
DATE:
TECHNICIAN:
II. PRE-START-UP (insert checkmark in box as each item is completed)
M VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT
M REMOVE ALL SHIPPING HOLDDOWN BOLTS AND BRACKETS PER INSTALLATION INSTRUCTIONS
M VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS
M CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS
M CHECK THAT INDOOR AIR FILTER IS CLEAN AND IN PLACE
M VERIFY THAT UNIT INSTALLATION IS LEVEL
M CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE AND SETSCREW
TIGHTNESS
III. START-UP
ELECTRICAL
SUPPLY VOLTAGE
L1-L2
L2-L3
L3-L1
COMPRESSOR AMPS
L1
L2
L3
INDOOR FAN AMPS
TEMPERATURES
OUTDOOR-AIR TEMPERATURE
DB
RETURN-AIR TEMPERATURE
DB
WB
COOLING SUPPLY AIR
PRESSURES
REFRIGERANT SUCTION
PSIG
REFRIGERANT DISCHARGE
PSIG
M VERIFY THAT 3-PHASE SCROLL COMPRESSOR (50SS048,060; 50SX036-060 UNITS ONLY) IS ROTATING
IN CORRECT DIRECTION
M 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
CUT ALONG DOTTED LINE
(Remove and Store in Job File)
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
START-UP CHECKLIST