WEATHERMAKER®
48AJ,AK,AW,AY020-060
Single Package Rooftop Units
Electric Cooling/Gas Heating
with Scroll Compressor and
COMFORTLINK™ Controls
Installation Instructions
CONTENTS
Page
WARNING
SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . . 1
1. Improper installation, adjustment, alteration, service,
or maintenance can cause property damage, personal
injury, or loss of life. Refer to the User’s Information
Manual provided with this unit for more details.
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-36
Step 1 — Provide Unit Support. . . . . . . . . . . . . . . . . . . 1
• ROOF CURB
• ALTERNATE UNIT SUPPORT
Step 2 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 2
• POSITIONING
• ROOF MOUNT
2. Do not store or use gasoline or other flammable va-
pors and liquids in the vicinity of this or any other
appliance.
Step 3 — Field Fabricate Ductwork. . . . . . . . . . . . . . . 2
Step 4 — Make Unit Duct Connections . . . . . . . . . . . 2
Step 5 — Install Flue Hood . . . . . . . . . . . . . . . . . . . . . . 19
Step 6 — Trap Condensate Drain. . . . . . . . . . . . . . . . 19
Step 7 — Install Gas Piping . . . . . . . . . . . . . . . . . . . . . 19
Step 8 — Make Electrical Connections . . . . . . . . . . 20
• POWER WIRING
What to do if you smell gas:
1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch, or use any
phone in your building.
3. IMMEDIATELY call your gas supplier from a neigh-
bor’s phone. Follow the gas supplier’s instructions.
• FIELD POWER SUPPLY
4. If you cannot reach your gas supplier, call the fire
department.
• FIELD CONTROL WIRING
Step 9 — Make Outdoor-Air Inlet
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
• ECONOMIZER AND FIXED OUTDOOR
AIR DAMPER
Step 10 — Position Power Exhaust/Barometric
Relief Damper Hood. . . . . . . . . . . . . . . . . . . . . . . . . . . 33
WARNING
Disconnect gas piping from unit when pressure testing at
pressure greater than 0.5 psig. Pressures greater than
0.5 psig will cause gas valve damage resulting in hazardous
condition. If gas valve is subjected to pressure greater than
0.5 psig, it must be replaced before use. When pressure
testing field-supplied gas piping at pressures of 0.5 psig or
less, a unit connected to such piping must be isolated by
closing the manual gas valve(s).
Step 11 — Route VAV Static Pressure Sensor . . . 34
Step 12 — Install All Accessories . . . . . . . . . . . . . . . 35
Step 13 — Field Modifications. . . . . . . . . . . . . . . . . . . 35
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical compo-
nents. Only trained and qualified service personnel should in-
stall, repair, or service air-conditioning equipment.
Untrained personnel can perform the basic maintenance
functions of cleaning coils and filters and replacing filters. All
other operations should be performed by trained service per-
sonnel. 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 extinguishers available for all brazing operations.
INSTALLATION
Step 1 — Provide Unit Support
CAUTION
1. All panels must be in place when rigging or damage
to unit may occur.
2. Unit is not designed for handling by fork truck.
WARNING
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480067-01 Printed in U.S.A. Form 48A-7SI Pg 1 8-09 Replaces: 48A-5SI
a48-6715
3
a48-6716
4
a48-6717
5
a48-8235
6
a48-8236
7
8
A48-8380
9
a48-8239
10
a48-8240
11
a50-8102
12
Table 1 — Physical Data — 48AJ,AK,AW,AY Units
UNIT 48AJ,AK,AW,AY
020
025
027
030
NOMINAL CAPACITY (tons)
20
25
27
30
BASE UNIT
OPERATING WEIGHT (lb)
See Operating Weights Table
COMPRESSOR
1…SR*812AT, 1…SR*942AT/
Quantity ... Type (Ckt 1/Ckt 2)
2…SR*782AT/1…SR*782AE
2 ... SR*942AT/1…SR*942AE
2…SR*782AT/2…SR*812AT
1…SR*942AE
2
Number of Refrigerant Circuits
Oil (oz) (Ckt 1, Ckt 2)
2
2
2
Precharged
Precharged
Precharged
Precharged
REFRIGERANT TYPE
Operating Charge (lb-oz)
Circuit 1
R-22
26-8
14-0
33-8
17-8
35-8
20-0
29-0
30-8
Circuit 2
CONDENSER COIL*
Quantity
Rows ... Fins/in.
Total Face Area (sq ft)
Internally Enhanced, 3/8″ Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins
1
1
1
1
2 ... 15
33.3
3 ... 15
33.3
3 ... 15
33.3
4 ... 15
33.3
CONDENSER FAN
Nominal Cfm
Quantity... Diameter (in.)
Motor Hp
Propeller Type
17,200
2 ... 30
1
15,850
2 ... 30
1
15,850
2 ... 30
1
14,500
2 ... 30
1
EVAPORATOR COIL
Tube Size (in.)
Internally Enhanced Copper Tubes, Aluminum Plate Fins with Intertwined Circuits
3
3
3
3
/
/
/
/
Rows ... Fins/in.
3 ...815
31.7
3 ...815
4 ...815
31.7
4 ...815
31.7
Total Face Area (sq ft)
31.7
EVAPORATOR FAN
Centrifugal Type
15
Quantity ... Size (in.)
Type Drive
2 ... 20 X 15
Belt
2 ... 20 X 15
Belt
2 ... 20 X 15
Belt
2 ... 20 X 15
Belt
Nominal Cfm
8,000
10
10,000
10
11,000
15
12,000
15
Motor Hp
5
15
5
10
20
10
20
Motor Frame Size
184T
215T
Ball
254T
184T
215T
Ball
254T
215T
254T
Ball
256T
215T
254T
Ball
256T
Motor Bearing Type
Maximum Allowable Rpm
Motor Pulley Pitch Diameter (in.)
Nominal Motor Shaft Diameter (in.)
Fan Pulley Pitch Diameter (in.)
Nominal Fan Shaft Diameter (in.)
Belt Quantity
1200
4.4
1200
6.1
1200
4.9
1200
5.7
4.8
11/8
12.4
5.7
15/8
9.1
4.8
11/8
12.4
5.5
15/8
8.7
4.4
13/8
9.4
5.9
15/8
8.7
4.4
13/8
9.5
5.9
15/8
8.7
13/8
13/8
15/8
15/8
8.6
11.1
8.1
9.1
115
/
115
1
/
115
/
115
/
16
1
116
BX50
63
2
5VX530
53
1
2
2
216
5VX530
50
2
5VX530
53
2
216
5VX530
53
2
5VX530
53
Belt Type
Belt Length (in.)
Pulley Center Line Distance (in.)
Factory Speed Setting (rpm)
BX56
56
BX56
56
5VX570
57
15.6-18.4
962
5VX530
53
BX50
50
BX50
50
16.0-18.7 15.6-18.4 15.0-17.9 15.6-18.4
15.0-17.9
1106
15.6-18.4 15.0-17.9 15.0-17.9 15.6-18.4 15.0-17.9 15.0-17.9
677
895
1096
677
819
1096
1187
884
1096
1187
FURNACE SECTION
Supply Line Pressure Range
Rollout Switch Cutout
Temp (F)†
5.0-in. wg min/13.5-in. wg max.
225
225
225
225
Burner Orifice Diameter (in. ...drill size)
Natural Gas
Std
Alt
.111 ... 34
.089 ... 43
.111 ... 34
.089 ... 43
.111 ... 34
.089 ... 43
.111 ... 34
.089 ... 43
Liquid Propane
Thermostat Heat Anticipator Setting
Stage 1 (amps)
0.24
0.13
0.24
0.13
0.24
0.13
0.24
0.13
Stage 2 (amps)
Gas Input (Btuh) Stage 1
262,500/394,000
262,500/394,000
262,500/394,000
262,500/394,000
(Low Heat/High Heat)
Stage 2
350,000/525,000
350,000/525,000
350,000/525,000
350,000/525,000
(Low Heat/High Heat)
Efficiency (Steady State) (%)
82
82
82
82
Temperature Rise Range
Manifold Pressure (in. wg)
Natural Gas
15-45/35-65
15-45/35-65
15-45/35-65
15-45/35-65
Std
Alt
3.5
3.5
2
3.5
3.5
2
3.5
3.5
2
3.5
3.5
2
Liquid Propane
Gas Valve Quantity
HIGH-PRESSURE SWITCH (psig)
Cutout
Reset (Auto.)
426
320
426
320
426
320
426
320
MIXED-AIR FILTERS
Quantity ... Size (in.) Standard
Pleated
10 ... 20 x 24 x 2
5 ... 20 x 20 x 4
5 ... 20 x 24 x 4
10 ... 20 x 24 x 2
5 ... 20 x 20 x 4
5 ... 20 x 24 x 4
10 ... 20 x 24 x 2
5 ... 20 x 20 x 4
5 ... 20 x 24 x 4
10 ... 20 x 24 x 2
5 ... 20 x 20 x 4
5 ... 20 x 24 x 4
OUTDOOR-AIR FILTERS
Quantity...Size (in.)
8...16 x 25 x 2
4...20 x 25 x 2
Direct Drive, Single-Phase Motors (Factory-Wired for High Speed Operation), Forward-Curved Fan Wheels with Backdraft Dampers on Each Fan
POWER EXHAUST
Housing
4...1
Motor, Quantity...Hp
Fan, Diameter...Width (in.)
11 x 10
LEGEND
*Sizes 020-040: Circuit 1 uses the lower portion of condenser coil, Circuit 2 uses the upper
portion.
Al
Cu
—
—
Aluminum
Copper
Sizes 041-060: Circuit 1 uses the left condenser coil, Circuit 2 the right. All units have
intertwined evaporator coils.
†Rollout switch is manual reset.
13
Table 1 — Physical Data — 48AJ,AK,AW,AY Units (cont)
UNIT 48AJ,AK,AW,AY
035
036
040
041
40
NOMINAL CAPACITY (tons)
35
35
40
BASE UNIT
OPERATING WEIGHT (lb)
See Operating Weights Table
COMPRESSOR
1…SR*812AT,
1…SR*812AT,
Quantity ... Type (Ckt 1/Ckt 2)
2…SR*942AT/2…SM125
2…SR*942AT/2…SM125
1…SR*942AT/2…SR*942AT
1…SR*942AT/2…SR*942AT
Number of Refrigerant Circuits
Oil (oz) (Ckt 1, Ckt 2)
2
2
2
2
Precharged
Precharged
Precharged
Precharged
REFRIGERANT TYPE
Operating Charge (lb-oz)
Circuit 1
R-22
33-0
38-0
36-0
58-0
36-0
47-0
47-0
47-0
Circuit 2
CONDENSER COIL*
Quantity
Rows ... Fins/in.
Total Face Area (sq ft)
Internally Enhanced, 3/8″ Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins
1
2
2
2
4 ... 15
33.3
2...15/4…15
66.7
2 ... 15 / 4 … 15
66.7
4...15/4…15
66.7
CONDENSER FAN
Nominal Cfm
Quantity... Diameter (in.)
Motor Hp
Propeller Type
14,500
2 ... 30
1
30,000
4...30
1
30,000
4 ... 30
1
30,000
4...30
1
EVAPORATOR COIL
Tube Size (in.)
Internally Enhanced Copper Tubes, Aluminum Plate Fins with Intertwined Circuits
1
1
1
1
/
/
/
/
Rows ... Fins/in.
6 ...216
31.3
4...217
4 ...216
31.3
4...217
31.3
Total Face Area (sq ft)
31.3
EVAPORATOR FAN
Centrifugal Type
Quantity ... Size (in.)
Type Drive
2 ... 20 X 15
Belt
2...20 X 15
Belt
2 ... 20 X 15
Belt
2...20 X 15
Belt
Nominal Cfm
14,000
20
14,000
20
16,000
20
16,000
20
Motor Hp
15
25
15
25
284T
15
254T
25
15
25
Motor Frame Size
254T
256T
Ball
284T
254T
256T
Ball
256T
Ball
284T
254T
256T
Ball
284T
Motor Bearing Type
Maximum Allowable Rpm
Motor Pulley Pitch Diameter (in.)
Nominal Motor Shaft Diameter (in.)
Fan Pulley Pitch Diameter (in.)
1300
5.7
1300
5.7
1300
5.7
1300
5.7
5.1
15/8
8.7
6.2
17/8
8.7
5.3
15/8
9.5
7.5
17/8
11.1
5.3
15/8
9.5
7.5
17/8
11.1
5.3
15/8
9.5
7.5
17/8
11.1
15/8
15/8
15/8
15/8
8.7
9.5
9.5
9.5
115
/
115/
2
Nominal Fan Shaft Diameter (in.)
115
/
115
/
16
16
Belt Quantity
2
5VX500
50
216
5VX530
53
2
5VX550
55
2
5VX530
53
2
2
5VX590
59
2
5VX530
53
216
5VX550
55
2
5VX590
59
2
5VX530
53
2
5VX590
59
Belt Type
5VX550
55
5VX550
55
Belt Length (in.)
Pulley Center Line Distance (in.)
Factory Speed Setting (rpm)
15.0-17.9 15.0-17.9 15.0-17.9 15.0-17.9 15.0-17.9 14.6-17.6 15.0-17.9 15.0-17.9 14.6-17.6 15.0-17.9 15.0-17.9 14.6-17.6
1005
1147
1247
976
1050
1182
976
1050
1182
976
1050
1182
FURNACE SECTION
Supply Line Pressure Range
Rollout Switch Cutout
Temp (F)†
5.0-in. wg min/13.5-in. wg max.
225
225
225
225
Burner Orifice Diameter (in ...drill size)
Natural Gas
Std
Alt
.111 ... 34
.089 ... 43
.120...31
.096...41
.120 ... 31
.096 ... 41
.120...31
.096...41
Liquid Propane
Thermostat Heat Anticipator Setting
Stage 1 (amps)
0.24
0.13
0.1
0.1
0.24
0.13
0.1
0.1
Stage 2 (amps)
Gas Input (Btuh) Stage 1
(Low Heat/High Heat)
Stage 2
262,500/394,000
300,000/600,000
300,000/600,000
300,000/600,000
350,000/525,000
400,000/800,000
400,000/800,000
400,000/800,000
(Low Heat/High Heat)
Efficiency (Steady State) (%)
Temperature Rise Range
Manifold Pressure (in. wg)
82
82
82
82
15-45/35-65
10-40/30-60
10-40/3 -60
10-40/30-60
Natural Gas
Liquid Propane
Gas Valve Quantity
Std
Alt
3.5
3.5
2
3.5
3.5
2
3.5
3.5
2
3.5
3.5
2
HIGH-PRESSURE SWITCH (psig)
Cutout
Reset (Auto.)
426
320
426
320
426
320
426
320
MIXED-AIR FILTERS
Quantity ... Size (in.) Standard
Pleated
10 ... 20 x 24 x 2
5 ... 20 x 20 x 4
5 ... 20 x 24 x 4
10...20 x 24 x 2
5...20 x 20 x 4
5...20 x 20 x 4
10 ... 20 x 24 x 2
5 ... 20 x 20 x 4
5 ... 20 x 24 x 4
10...20 x 24 x 2
5...20 x 20 x 4
5...20 x 20 x 4
OUTDOOR-AIR FILTERS
Quantity...Size (in.)
8...16 x 25 x 2
4...20 x 25 x 2
POWER EXHAUST
Motor, Quantity...Hp
Fan, Diameter...Width (in.)
Direct Drive, Single-Phase Motors (Factory-Wired for High Speed Operation), Forward-Curved Fan Wheels with Backdraft Dampers on Each Fan Housing
4...1
11 x 10
LEGEND
*Sizes 020-040: Circuit 1 uses the lower portion of condenser coil, Circuit 2 uses the upper
portion.
Al
Cu
—
—
Aluminum
Copper
Sizes 041-060: Circuit 1 uses the left condenser coil, Circuit 2 the right. All units have
intertwined evaporator coils.
†Rollout switch is manual reset.
14
Table 1 — Physical Data — 48AJ,AK,AW,AY Units (cont)
UNIT 48AJ,AK,AW,AY
050
051
060
NOMINAL CAPACITY (tons)
50
50
60
BASE UNIT
OPERATING WEIGHT (lb)
See Operating Weights Table
COMPRESSOR
2…SM125/1…SM125,
1..SM160,1..SM175/
1..SM160,1..SM175
2
Quantity ... Type (Ckt 1/Ckt 2)
2…SM125/2…SM125
1…SM175
2
Number of Refrigerant Circuits
Oil (oz) (Ckt 1, Ckt 2)
2
Precharged
Precharged
Precharged
REFRIGERANT TYPE
Operating Charge (lb-oz)
Circuit 1
R-22
64-4
58-8
98-0
98-0
81-0
81-0
Circuit 2
CONDENSER COIL*
Quantity
Rows ... Fins/in.
Total Face Area (sq ft)
Internally Enhanced, 3/8″ Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins
2
2
2
4 ... 15
66.7
4…15
100
4…15
100
CONDENSER FAN
Nominal Cfm
Quantity... Diameter (in.)
Motor Hp
Propeller Type
25,600
4 ... 30
1
38,400
6...30
1
38,400
6 ... 30
1
EVAPORATOR COIL
Tube Size (in.)
Internally Enhanced Copper Tubes, Aluminum Plate Fins with Intertwined Circuits
1
1
1
/
/
/
Rows ... Fins/in.
6 ...216
31.3
4...217
48.1
4 ...217
48.1
Total Face Area (sq ft)
EVAPORATOR FAN
Quantity ... Size (in.)
Type Drive
Centrifugal Type
3...20 X 15
Belt
2 ... 20 X 15
Belt
3 ... 20 X 15
Belt
Nominal Cfm
20,000
20,000
24,000
40
40
40
40
Motor Hp
20
25
30
20
25
30
25
30
(High Eff.) (Prem. Eff.)
(High Eff.) (Prem. Eff.)
Motor Frame Size
Motor Bearing Type
Maximum Allowable Rpm
Motor Pulley Pitch Diameter (in.)
Nominal Motor Shaft Diameter (in.)
Fan Pulley Pitch Diameter (in.)
256T
284T
Ball
1300
6.2
286T
256T
284T
286T
Ball
1200
5.9
324T
324T
284T
286T
324T
324T
Ball
1200
5.7
15/8
9.5
6.7
17/8
9.5
5.9
15/8
11.1
5.3
17/8
9.1
6.5
21/8
9.5
9.5
21/8
13.7
5.3
17/8
9.1
5.9
17/8
9.5
6.5
21/8
9.5
9.5
21/8
13.7
17/8
9.5
17/8
9.5
115
3
/
Nominal Fan Shaft Diameter (in.)
115
/
115/
16
16
Belt Quantity
2
5VX550
55
216
5VX570
57
2
5VX570
57
2
5VX560
56
3
5VX530
53
3
5VX570
57
2
3
5VX530
53
3
5VX550
55
3
5VX570
57
2
Belt Type
5VX550
55
5VX650
65
5VX650
65
Belt Length (in.)
Pulley Center Line Distance (in.)
Factory Speed Setting (rpm)
15.0-17.9 14.6-17.6 14.6-17.6 15.0-17.9 15.2-17.5 14.7-17.2 14.2-17.0
14.2-17.0
1214
15.2-17.5 14.7-17.2 14.2-17.0
1019 1086 1197
14.2-17.0
1214
1061
1154
1249
930
1019
1086
1197
FURNACE SECTION
Supply Line Pressure Range
Rollout Switch Cutout
Temp (F)†
5.0-in. wg min/13.5-in. wg max.
225
225
225
Burner Orifice Diameter (in ...drill size)
Natural Gas
Std
Alt
.120 ... 31
.096 ... 41
.120...31
.096...41
.120 ... 31
.096 ... 41
Liquid Propane
Thermostat Heat Anticipator Setting
Stage 1 (amps)
0.24
0.13
0.1
0.1
0.36
0.13
Stage 2 (amps)
Gas Input (Btuh) Stage 1
(Low Heat/High Heat)
Stage 2
300,000/600,000
582,000/873,000
582,000/873,000
400,000/800,000
776,000/1,164,000
776,000/1,164,000
(Low Heat/High Heat)
Efficiency (Steady State) (%)
Temperature Rise Range
Manifold Pressure (in. wg)
82
82
82
10-40/30-60
10-40/30-60
10-40/30-60
Natural Gas
Liquid Propane
Gas Valve Quantity
Std
Alt
3.5
3.5
2
3.3
3.3
3
3.3
3.3
3
HIGH-PRESSURE SWITCH (psig)
Cutout
Reset (Auto.)
426
320
426
320
426
320
MIXED-AIR FILTERS
Quantity ... Size (in.) Standard
Pleated
10 ... 20 x 24 x 2
5 ... 20 x 20 x 4
5 ... 20 x 24 x 4
16...20 x 24 x 2
8...20 x 20 x 4
8...20 x 24 x 4
16 ... 20 x 24 x 2
8 ... 20 x 20 x 4
8 ... 20 x 24 x 4
OUTDOOR-AIR FILTERS
Quantity...Size (in.)
8...16 x 25 x 2
4...20 x 25 x 2
12...16 x 25 x 2
6...20 x 25 x 2
POWER EXHAUST
Motor, Quantity...Hp
Fan, Diameter...Width (in.)
Direct Drive, Single-Phase Motors (Factory-Wired for High Speed Operation), Forward-Curved Fan Wheels with Backdraft Dampers on Each Fan Housing
4...1
6...1
11 x 10
11 x 10
LEGEND
*Sizes 020-040: Circuit 1 uses the lower portion of condenser coil, Circuit 2 uses the upper
portion.
Al
Cu
—
—
Aluminum
Copper
Sizes 041-060: Circuit 1 uses the left condenser coil, Circuit 2 the right. All units have
intertwined evaporator coils.
†Rollout switch is manual reset.
15
a48-8246
16
Table 2 — Unit Operating Weights
BASE UNIT WEIGHTS — lb
UNIT
020
025
027
030
035
036
040
041
050
051
060
48AJ/AK Low Heat
48AJ/AK High Heat
48AW/AY Low Heat
48AW/AY High Heat
3842
3922
3882
3962
3915
3995
3955
4035
4032
4112
4072
4152
4182
4262
4222
4302
4435
4595
4475
4635
4815
4975
4855
5015
4975
5135
5015
5175
5091
5251
5131
5291
5446
5606
5486
5646
7224
7464
7264
7514
7388
7628
7428
7678
Table 3 — Option and Accessory Weights
OPTION/ACCESSORY WEIGHTS — lb
OPTION/
ACCESSORY
020
300
450
500
220
45
025
300
450
500
220
45
027
300
450
500
220
45
030
300
450
500
220
45
035
300
450
500
285
45
036
300
450
500
380
45
040
300
450
500
285
45
041
300
450
500
380
45
050
051
450
675
725
651
45
060
Barometric Relief
Power Exhaust
Mod. Power Exhaust
300
450
500
380
45
450
675
725
651
45
Cu Tubing/Cu Fin Condenser Coil
Outdoor Air Hood Crate and Packaging
(Less Hoods' Weight)
(Packaging Only)
(Packaging Only)
Outdoor Air Hoods/Filters
Hail Guard
Roof Curb (14-in.)
170
73
365
170
73
365
170
73
365
170
73
365
170
73
410
170
146
410
170
146
410
170
146
410
170
146
410
255
219
540
255
219
585
Table 4 — Constant Volume Fan Motor Weights
Table 5 — Variable Volume Fan Motor Weights
CV MOTOR WEIGHTS — lb
VAV MOTOR WEIGHTS — lb
HIGH
EFFICIENCY
IFM
PREMIUM
EFFICIENCY
IFM
HIGH
EFFICIENCY
IFM
PREMIUM
EFFICIENCY
IFM
MOTOR
HP
UNIT
VOLTAGE
MOTOR
HP
UNIT
VOLTAGE
230/460
575
230/460
575
230/460
575
230/460
575
230/460
575
230/460
575
230/460
575
78
78
94
92
230/460
575
230/460
575
230/460
575
230/460
575
230/460
575
230/460
575
230/460
575
125
163
204
204
238
240
348
304
377
375
480
418
637
587
141
177
250
242
305
310
386
350
446
454
552
494
680
625
5
5
118
118
150
150
212
212
240
240
283
283
372
372
164
156
217
220
250
258
309
319
355
359
415
410
10
15
20
25
30
40
10
15
20
25
30
40
LEGEND AND NOTES FOR TABLES 2-5
LEGEND
Copper
NOTES:
1. Base unit weight includes outdoor-air hoods. Base unit weight
does NOT include indoor-fan motor. ADD indoor-fan motor,
FIOPs, and accessories for TOTAL operating weight.
2. The VAV motor weights include indoor fan motor and the VFD
(variable frequency drive), VFD transducers, and associated
wiring.
Cu
—
—
—
—
—
—
—
CV
Constant Volume
FIOP
HP
IFM
VAV
VFD
Factory-Installed Option
Horsepower
Indoor Fan Motor
Variable Air Volume
Variable Frequency Drive
17
Table 6 — Evaporator Fan Motor Data
MOTOR
SHEAVE
PITCH
DIAMETER
(in.)
FAN
UNIT
SIZE
48AJ,AK,
AW,AY
FAN
MOTOR
SHAFT DIA.
(in.)
MOTOR
SHEAVE
(P/N)
BUSHING
DIAMETER
(in.)
FAN
SHEAVE
(P/N)
SHEAVE
PITCH
BUSHING
BELT
BELT
TENSION
(lb at .25 in.)
MOTOR
HP
SHAFT
SPEED
(rpm)
DIAMETER (Quantity)
DIAMETER
(in.)
(in.)
(P/N)
5
10
15
1.125
1.375
1.625
677
895
BK55
2BK50
2B5V56
4.8
4.4
5.7
NONE - 1.125 1B5V124
12.4
8.6
B - 1.9375
B - 1.9375
B - 1.9375
BX56
BX50
8
8
9
020
025
027
030
035
036
040
041
050
NONE - 1.375
B - 1.625
2B5V86
2B5V90
1096
9.1
(2) 5VX530
5
10
15
1.125
1.375
1.625
677
962
1106
BK55
1B5V60
2B5V54
4.8
6.1
5.5
NONE - 1.125 1B5V124
12.4
11.1
8.7
B - 1.9375
B - 1.9375
B - 1.9375
BX56
5VX570
(2) 5VX530
8
11
9
H - 1.375
B - 1.625
1B5V110
2B5V86
10
15
20
1.375
1.625
1.625
819
1096
1187
2BK50
2B5V56
2B5V58
4.4
5.7
5.9
NONE - 1.375
B - 1.625
B - 1.625
2B5V94
2B5V90
2B5V86
9.4
9.1
8.7
B - 1.9375
B - 1.9375
B - 1.9375
(2) BX50
(2) 5VX530
(2) 5VX530
8
10
11
10
15
20
1.375
1.625
1.625
884
1096
1187
2BK50
2B5V56
2B5V58
4.4
5.7
5.9
H - 1.375
B - 1.625
B - 1.625
2B5V94
2B5V90
2B5V86
9.5
9.1
8.7
B - 1.9375
B - 1.9375
B - 1.9375
(2) BX50
(2) 5VX530
(2) 5VX530
8
9
11
15
20
25
1.625
1.625
1.875
1005
1147
1247
2B5V50
2B5V56
2B5V62
5.1
5.7
6.2
B - 1.625
B - 1.625
B - 1.875
2B5V86
2B5V86
2B5V86
8.7
8.7
8.7
B - 1.9375
B - 1.9375
B - 1.9375
(2) 5VX500
(2) 5VX530
(2) 5VX530
9
10
11
15
20
25
1.625
1.625
1.875
976
1050
1182
2B5V52
2B5V56
2B5V74
5.3
5.7
7.5
B - 1.625
B - 1.625
B - 1.875
2B5V94
2B5V94
2B5V110
9.5
9.5
11.1
B - 1.9375
B - 1.9375
B - 1.9375
(2) 5VX530
(2) 5VX550
(2) 5VX590
10
11
11
15
20
25
1.625
1.625
1.875
976
1050
1182
2B5V52
2B5V56
2B5V74
5.3
5.7
7.5
B - 1.625
B - 1.625
B - 1.875
2B5V94
2B5V94
2B5V110
9.5
9.5
11.1
B - 1.9375
B - 1.9375
B - 1.9375
(2) 5VX530
(2) 5VX550
(2) 5VX590
10
11
11
15
20
25
1.625
1.625
1.875
976
1050
1182
2B5V52
2B5V56
2B5V74
5.3
5.7
7.5
B - 1.625
B - 1.625
B - 1.875
2B5V94
2B5V94
2B5V110
9.5
9.5
11.1
B - 1.9375
B - 1.9375
B - 1.9375
(2) 5VX530
(2) 5VX550
(2) 5VX590
10
11
11
20
25
30
1.625
1.875
1.875
1061
1154
1247
2B5V56
2B5V62
2B5V66
5.7
6.2
6.7
B - 1.625
B - 1.875
B - 1.875
2B5V94
2B5V94
2B5V94
9.5
9.5
9.5
B - 1.9375
B - 1.9375
B - 1.9375
(2) 5VX550
(2) 5VX570
(2) 5VX570
10
11
13
20
25
1.625
1.875
1.875
2.125
2.125
930
1019
1086
1197
1214
2B5V58
3B5V52
3B5V58
3B5V64
2B5V94
5.9
5.3
5.9
6.5
9.5
B - 1.625
B - 1.875
B - 1.875
B - 2.125
B - 2.125
2B5V110
3B5V90
3B5V94
3B5V94
2B5V136
11.1
9.1
B - 1.9375
B - 1.9375
B - 1.9375
B - 1.9375
B - 1.9375
(2) 5VX560
(3) 5VX530
(3) 5VX550
(3) 5VX570
(2) 5VX650
11
12
12
14
15
051
30
9.5
40 High
40 Prem.
9.5
13.7
25
30
40 High
40 Prem.
1.875
1.875
2.125
2.125
1019
1086
1197
1214
3B5V52
3B5V58
3B5V64
2B5V94
5.3
5.9
6.5
9.5
B - 1.875
B - 1.875
B - 2.125
B - 2.125
3B5V90
3B5V94
3B5V94
2B5V136
9.1
9.5
B - 1.9375
B - 1.9375
B - 1.9375
B - 1.9375
(3) 5VX530
(3) 5VX550
(3) 5VX570
(2) 5VX650
12
12
14
15
060
9.5
13.7
NOTES:
1. Motor shaft speed is 1750 rpm. The fan shaft diameter is 115
/16 inches.
2. All indoor fan motors meet the minimum efficiency requirements
as established by the Energy Policy Act of 1992 (EPACT), effective
October 24, 1997.
a48-8241
a48-8242
Fig. 12 — Air Distribution — Thru-the-Bottom
Fig. 13 — Air Distribution — Thru-the-Side
18
Step 5 — Install Flue Hood
48AJ,AK,AW,AY020-050 UNITS — Flue hood is shipped
inside gas section of unit. To install, secure flue hood to access
panel. See Fig. 14.
48AJ,AK,AW,AY051 AND 060 UNITS — Flue hood and
wind baffle are shipped inside gas section of unit. To install, se-
cure flue hood to access panel. Install the two pieces of the
wind baffle over the flue hood. See Fig. 15.
NOTE: When properly installed, flue hood will line up with
combustion fan housing. See Fig. 16.
a48-3823
Fig. 16 — Combustion Fan Housing Location
(48AJ,AK,AW,AY020-050 Shown)
Step 6 — Trap Condensate Drain — See Fig. 4-9
for drain location. Condensate drain is open to atmosphere and
must be trapped. Install a trapped drain at the drain location.
One 1-in. FPT coupling is provided inside the unit evaporator
section for condensate drain connection. A trap at least 4-in.
deep must be used. See Fig. 17. Trap must be installed to pre-
vent freeze-up.
Condensate pans are sloped so that water will completely
drain from the condensate pan to comply with indoor air quali-
ty guidelines. The condensate drain pans are not insulated.
a48-3712
Fig. 14 — Flue Hood Location
(48AJ,AK,AW,AY020-050 Units)
a48-3714
GAS SECTION
ACCESS PANEL
Fig. 17 — Condensate Drain Trap Piping Details
(Typical Roof Curb or Slab Mount Shown)
FLUE HOOD
Step 7 — Install Gas Piping — Unit is equipped for
use with natural gas. Installation must conform with local
building codes or, in the absence of local codes, with the Na-
tional Fuel Gas Code, ANSI Z223.1.
WIND
BAFFLE
Install manual gas shutoff valve with a 1/8-in. NPT pressure
tap for test gage connection at unit. Field gas piping must in-
clude sediment trap and union. See Fig. 18. An 1/8-in. NPT is
also located on the gas manifold adjacent to the gas valve.
a48-4076
TOP VIEW
SIDE VIEW
WARNING
Fig. 15 — Flue Hood Location
(48AJ,AK,AW,AY051 and 060 Units)
Do not pressure test gas supply while connected to unit.
Always disconnect union before servicing. Serious injury
could result.
19
local codes) in branch circuit wiring remote from unit. Observe
requirements of NEC Article 440. Install service switch
upstream of remote fuses if required.
The main power terminal block is suitable for use with
aluminum or copper wire. See Fig. 19. Units have circuit
breakers for compressors, fan motors, and control circuit. The
unit must be electrically grounded in accordance with local
codes, or in absence of local codes, with NEC, ANSI C1-latest
year.
FIELD POWER SUPPLY — Unit is factory wired for volt-
age shown on unit nameplate. See Tables 8A and 8B for elec-
trical data.
Field wiring can be brought into the unit from bottom
(through basepan and roof curb) or through side of unit (corner
post next to control box).
a48-2524
A 31/2-in. NPT coupling for field power wiring and a 3/4-in.
NPT coupling for 24-v control wiring are provided in basepan.
In the side post, there are two 21/2-in. (48A020-035) or 3-in.
(48A036-060) knockouts for the field power wiring. See
Fig. 4-9. If control wiring is to be brought in through the side of
Fig. 18 — Field Gas Piping
IMPORTANT: Natural gas pressure at unit gas connection
must not be less than 5 in. wg or greater than 13.5 in. wg.
7
unit, a /8-in. diameter hole is provided in the condenser side
post next to the control box.
Do not route control wiring in the same conduit as power
wiring.
If disconnect box is mounted to corner post, be careful not
to drill or screw into the condenser coil.
Size gas-supply piping for 0.5-in. wg maximum pressure
drop. Do not use supply pipe smaller than unit gas connection.
OPTIONAL STAGED GAS UNITS — See Table 7 for staged
gas information. Staging pattern is selected during controls
start-up.
For complete information and service instructions for
Staged Gas Control Units, see Control Operation and Trouble-
shooting literature.
TB1
FIELD
11
12
13
21
22
POWER
SUPPLY
Table 7 — 48A Series Staged Gas Control
MODEL NUMBER POSITION
NUMBER OF
23
HEAT SIZE
STAGES
5
6,7,8
020
025
027
030
035
036
040
041
050
035
036
040
041
050
020
025
027
030
051,060
051,060
S
Low
EQUIP GND
OPTIONAL
5 stages
FIELD-INSTALLED DISCONNECT
FACTORY-INSTALLED
DISCONNECT
T
T
High
High
11
12
13
21
22
7 stages
23
T
S
9 stages
11 stages
High
Low
Step 8 — Make Electrical Connections
POWER WIRING — Units are factory wired for the voltage
shown on the unit nameplate.
GND
a48-6977
FACTORY-INSTALLED DISCONNECT
Provide a unit safety disconnect switch in the main power
supply to each unit (see Fig. 19). Select switch size and mount-
ing location in accordance with applicable local codes or
National Electrical Code (NEC). If combining the functions of
safety disconnect with maximum overcurrent protection
(MOCP) fuses (“fused disconnect”), coordinate safety switch
size with MOCP size data as marked on unit informative plate.
LEGEND
GND — Ground
NEC — National Electrical Code
TB — Terminal Block
Fig. 19 — Field Power Wiring Connections
Unit may be equipped with optional factory-installed non-
fused disconnect switch (see Fig. 19). Provide maximum
overcurrent protection devices (fuses or HACR breakers, per
20
Table 8A — Electrical Data — 48AJ,AK,AW,AY Units without Convenience Outlet
COMPRESSOR
Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2
Min Max RLA LRA RLA LRA RLA LRA RLA LRA Qty
VOLTAGE
RANGE
CONDENSER EVAPORATOR POWER
FAN MOTOR FAN MOTOR EXHAUST
UNIT
SIZE
48A
POWER SUPPLY
VOLTAGE
3 PH, 60 Hz
FLA
Hp
FLA
FLA (total) MCA
MOCP*
—
23.6
104.5
128.1
125
150
5
16.7
6.5
—
120.5
144.1
139.8
163.4
103.2
126.8
117.2
140.8
134.7
158.3
47.4
60.0
54.7
67.3
63.5
76.1
40.6
50.2
46.0
55.6
53.5
63.1
109.1
132.7
124.5
148.1
143.8
167.4
107.8
131.4
121.2
144.8
138.7
162.3
55.6
68.2
62.1
74.7
70.9
83.5
43.3
52.9
48.4
58.0
55.9
65.5
128.3
151.9
147.6
171.2
164.1
187.7
125.0
148.6
142.5
166.1
157.5
181.1
64.6
77.2
73.4
86.0
80.9
93.5
150
150
175
200
125
150
125
150
175
200
50
70
60
80
80
90
50
60
50
60
70
80
125
150
150
175
175
200
125
150
125
150
175
200
60
80
70
80
90
100
50
60
50
60
70
80
150
175
175
200
200
225
150
175
175
200
200
225
70
90
208
230
460
575
208
230
460
575
208
230
460
575
187 229
207 253
23
23
184
184
23
23
184
184
23
23
184
184
90
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
2
2
2
2
2
2
2
2
2
2
2
2
10
15
5
30.8
46.2
15.2
28.0
42.0
7.6
(ea)
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
12.6
—
12.6
—
12.6
—
9.6
—
9.6
—
9.6
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
12.6
—
12.6
—
12.6
—
9.6
—
9.6
—
9.6
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
12.6
—
12.6
—
12.6
—
12.6
6.6
(ea)
10
15
5
020
025
027
3.3
(ea)
414 508 10.2
90 10.2
90 10.2
10
15
5
14.0
21.0
6.1
2.6
(ea)
518 632
9
73
9
73
9
73
10
15
5
11.0
17.0
16.7
30.8
46.2
15.2
28.0
42.0
7.6
6.5
(ea)
187 229 21.8 184 25.6 190 25.6 190
10
15
5
6.6
(ea)
207 253 21.8 184 25.6 190 25.6 190
10
15
5
3.3
(ea)
414 508
518 632
11
9
90 13.5
73 10.2
95 13.5
75 10.2
95
75
10
15
5
14.0
21.0
6.1
2.6
(ea)
10
15
10
15
20
10
15
20
10
15
20
10
15
20
11.0
17.0
30.8
46.2
59.4
28.0
42.0
54.0
14.0
21.0
27.0
11.0
17.0
22.0
6.5
(ea)
187 229 25.6 190 25.6 190 25.6 190
6.6
(ea)
207 253 25.6 190 25.6 190 25.6 190
3.3
(ea)
90
100
100
110
60
70
70
80
80
90
414 508 13.5
518 632 10.2
95 13.5
75 10.2
95 13.5
75 10.2
95
75
49.6
62.6
57.1
69.7
63.3
75.9
2.6
(ea)
—
12.6
—
12.6
See Legend and Notes on page 24.
21
Table 8A — Electrical Data — 48AJ,AK,AW,AY Units without Convenience Outlet (cont)
COMPRESSOR
Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2
Min Max RLA LRA RLA LRA RLA LRA RLA LRA Qty
VOLTAGE
RANGE
CONDENSER EVAPORATOR POWER
FAN MOTOR FAN MOTOR EXHAUST
UNIT
SIZE
48A
POWER SUPPLY
VOLTAGE
3 PH, 60 Hz
FLA
Hp
FLA
FLA (total) MCA
MOCP*
—
23.6
141.1
164.7
150
175
10
30.8
6.5
—
160.4
184.0
176.9
200.5
137.8
161.4
155.3
178.9
170.5
193.9
66.5
79.1
75.3
87.9
82.8
95.4
55.0
68.0
62.5
75.1
68.7
81.3
169.4
193.6
185.9
209.5
205.1
228.7
164.3
187.9
179.3
202.9
196.8
220.4
84.4
97.0
91.9
104.5
100.6
113.2
66.1
78.7
72.3
84.9
78.6
91.2
182.4
206.0
198.9
222.5
218.1
241.7
177.5
201.1
192.5
216.1
210.0
233.6
91.0
103.6
200
225
225
250
150
175
175
200
200
225
80
90
90
100
100
110
60
80
70
90
90
100
200
225
225
250
250
300
200
225
225
250
250
250
100
110
110
125
125
125
80
90
90
100
100
110
225
250
250
250
250
300
200
225
225
250
208
230
460
575
208
230
460
575
208
230
460
575
187 229
207 253
23
23
184
184
23
23
184 21.8 184 21.8 184
2
2
2
2
2
2
2
2
4
4
4
4
15
20
10
15
20
10
15
20
10
15
20
15
20
25
15
20
25
15
20
25
15
20
25
15
20
25
15
20
25
15
20
25
15
20
25
46.2
59.4
28.0
42.0
54.0
14.0
21.0
27.0
11.0
17.0
22.0
46.2
59.4
74.8
42.0
54.0
68.0
21.0
27.0
34.0
17.0
22.0
27.0
46.2
59.4
74.8
42.0
54.0
68.0
21.0
27.0
34.0
17.0
22.0
27.0
(ea)
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
12.6
—
12.6
—
12.6
—
12.6
—
12.6
—
12.6
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
12.6
—
12.6
—
12.6
—
12.6
—
12.6
—
12.6
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
12.6
—
12.6
—
12.6
—
9.6
6.6
(ea)
184 21.8 184 21.8 184
030
3.3
(ea)
414 508 10.2
90 10.2
90
73
11
9
90
73
11
9
90
73
2.6
(ea)
518 632
9
73
9
6.5
(ea)
187 229 21.8 184 25.6 190 25.6 190 25.6 190
6.6
(ea)
207 253 21.8 184 25.6 190 25.6 190 25.6 190
035
3.3
(ea)
414 508
518 632
11
9
90 13.5
73 10.2
95 13.5
75 10.2
95 13.5
75 10.2
95
75
2.6
(ea)
6.5
(ea)
187 229 21.8 184 25.6 190 25.6 190 25.6 190
6.6
(ea)
207 253 21.8 184 25.6 190 25.6 190 25.6 190
250
300
110
110
125
125
125
150
80
90
90
100
036
3.3
(ea)
98.5
111.1
107.2
119.8
71.3
80.9
77.5
87.1
83.8
93.4
414 508
518 632
11
9
90 13.5
73 10.2
95 13.5
75 10.2
95 13.5
75 10.2
95
75
2.6
(ea)
—
9.6
—
9.6
110
110
See Legend and Notes on page 24.
22
Table 8A — Electrical Data — 48AJ,AK,AW,AY Units without Convenience Outlet (cont)
COMPRESSOR
Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2
Min Max RLA LRA RLA LRA RLA LRA RLA LRA Qty
VOLTAGE
RANGE
CONDENSER EVAPORATOR POWER
FAN MOTOR FAN MOTOR EXHAUST
UNIT
SIZE
48A
POWER SUPPLY
VOLTAGE
3 PH, 60 Hz
FLA
Hp
FLA
FLA (total) MCA
MOCP*
—
23.6
203.6
227.2
225
250
15
46.2
6.5
—
220.1
243.7
239.3
262.4
198.7
222.3
213.7
237.3
231.2
254.8
98.5
111.1
106.0
118.6
114.7
127.3
77.9
90.5
84.1
96.7
90.4
103.0
203.6
227.2
220.1
243.7
239.3
262.9
198.7
222.3
213.7
237.3
231.2
254.8
98.5
111.1
106.0
118.6
114.7
127.3
77.9
87.5
84.1
93.7
90.4
100.0
250.2
273.8
269.4
293.0
285.9
309.5
243.8
267.4
250
300
300
300
225
250
250
250
250
300
110
125
125
125
125
150
90
100
100
110
110
125
225
250
250
300
300
300
225
250
250
250
250
300
110
125
125
125
125
150
90
100
100
110
110
125
300
300
300
350
350
350
250
300
300
300
350
350
208
230
460
575
187 229 25.6 190 25.6 190 34.3 265 34.3 265
4
4
4
4
20
25
15
20
25
15
20
25
15
20
25
15
20
25
15
20
25
15
20
25
15
20
25
20
25
30
20
25
30
20
25
30
20
25
30
59.4
74.8
42.0
54.0
68.0
21.0
27.0
34.0
17.0
22.0
27.0
46.2
59.4
74.8
42.0
54.0
68.0
21.0
27.0
34.0
17.0
22.0
27.0
59.4
74.8
88.0
54.0
68.0
80.0
27.0
34.0
40.0
22.0
27.0
32.0
(ea)
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
12.6
—
12.6
—
12.6
—
12.6
—
12.6
—
12.6
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
12.6
—
12.6
—
12.6
—
9.6
—
9.6
—
9.6
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
12.6
—
12.6
—
12.6
—
12.6
6.6
(ea)
207 253 25.6 190 25.6 190 34.3 265 34.3 265
040
041
050
3.3
(ea)
414 508 13.5
518 632 10.2
95 13.5
75 10.2
95
16
120
16
120
80
2.6
(ea)
75 12.9
80 12.9
6.5
(ea)
208
230
460
575
208
187 229 25.6 190 25.6 190 34.3 265 34.3 265
4
4
4
4
4
6.6
(ea)
207 253 25.6 190 25.6 190 34.3 265 34.3 265
3.3
(ea)
414 508 13.5
518 632 10.2
95 13.5
75 10.2
95
16
120
16
120
80
2.6
(ea)
75 12.9
80 12.9
6.5
(ea)
187 229 34.3 265 34.3 265 34.3 265
47
47
380
6.6
(ea)
261.3
284.9
276.3
299.9
117.4
130.0
126.1
138.7
133.6
146.2
95.2
107.8
230
460
575
207 253 34.3 265 34.3 265 34.3 265
380
4
4
4
125
150
150
150
150
175
110
125
125
125
125
150
3.3
(ea)
414 508
16
120
16
120
16
120 22.4 175
2.6
(ea)
—
12.6
—
12.6
101.5
114.1
107.7
120.3
518 632 12.9
80 12.9
80 12.9
80 18.6 140
See Legend and Notes on page 24.
23
Table 8A — Electrical Data — 48AJ,AK,AW,AY Units without Convenience Outlet (cont)
COMPRESSOR
Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2
Min Max RLA LRA RLA LRA RLA LRA RLA LRA Qty
VOLTAGE
RANGE
CONDENSER EVAPORATOR POWER
FAN MOTOR FAN MOTOR EXHAUST
UNIT
SIZE
48A
POWER SUPPLY
VOLTAGE
3 PH, 60 Hz
FLA
Hp
FLA
FLA (total) MCA
MOCP*
—
35.4
250.5
285.9
300
300
20
59.4
—
269.7
305.1
286.2
321.6
318.7
354.1
244.3
279.7
261.8
297.2
276.8
312.2
306.8
342.2
117.6
136.5
126.3
145.2
133.8
152.7
148.8
167.7
94.7
109.1
101.0
115.4
107.2
121.6
118.5
132.9
308.1
343.5
324.6
360.0
357.1
392.5
300.2
335.6
315.2
350.6
345.2
380.6
147.5
166.4
155.0
173.9
170.0
188.9
119.8
138.7
126.0
144.9
300
350
350
400
400
450
250
300
300
350
350
350
400
400
125
150
150
175
150
175
200
200
110
125
125
125
125
150
150
150
350
400
400
400
450
450
350
350
350
400
400
450
175
175
175
200
200
225
25
30
40
20
25
30
40
20
25
30
40
20
25
30
40
25
30
40
25
30
40
25
30
40
25
30
40
74.8
88
35.4
6.5
208
230
460
575
187 229 34.3 265 34.3 265 34.3 265 34.3 265
6
6
6
6
(ea)
—
35.4
—
35.4
—
35.4
—
35.4
—
35.4
—
35.4
—
18.9
—
18.9
—
18.9
—
18.9
—
14.4
—
14.4
—
14.4
—
14.4
—
35.4
—
35.4
—
35.4
—
35.4
—
35.4
—
35.4
—
18.9
—
18.9
—
18.9
—
18.9
114
54
68
6.6
(ea)
207 253 34.3 265 34.3 265 34.3 265 34.3 265
80
104
27
051
34
3.3
(ea)
414 508
16
120
16
120
16
120
16
120
40
52
22
27
2.6
(ea)
518 632 12.9
80 12.9
80 12.9
80 12.9
80
32
41
75.0
88.0
114.0
68.0
80.0
104.0
34.0
40.0
52.0
27.0
32.0
41.0
6.5
208
230
460
575
187 229 40.8 265
47 380 40.8 265
47 380
6
6
6
6
(ea)
6.6
(ea)
207 253 40.8 265
47 380 40.8 265
47 380
060
3.3
(ea)
414 508 20.2 135 22.4 175 20.2 135 22.4 175
125
150
150
175
175
175
2.6
(ea)
—
18.9
—
18.9
518 632 16.6 120 18.6 140 16.6 120 18.6 140
137.3
156.2
LEGEND
— Full Load Amps
Example: Supply voltage is 460-3-60.
AB = 452 v
FLA
BC = 464 v
HACR — Heating, Air Conditioning and Refrigeration
LRA — Locked Rotor Amps
AC = 455 v
452 + 464 + 455
MCA — Minimum Circuit Amps
Average Voltage =
MOCP — Maximum Overcurrent Protection
NEC — National Electrical Code
RLA — Rated Load Amps
3
1371
=
3
= 457
*Fuse or HACR circuit breaker per NEC.
NOTES:
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
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
Canadian units may be fuse or circuit breaker.
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
7
2. 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 percent
of voltage imbalance.
% Voltage Imbalance = 100 x
457
= 1.53%
This amount of phase imbalance is satisfactory as it is below the max-
imum allowable 2%.
% Voltage imbalance
max voltage deviation from average voltage
= 100 x
IMPORTANT: If the supply voltage phase imbalance is more than
2%, contact your local electric utility company immediately.
average voltage
24
Table 8B — Electrical Data — 48AJ,AK,AW,AY Units with Convenience Outlet
COMPRESSOR
Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2
VOLTAGE
RANGE
CONDENSER EVAPORATOR POWER CONVENIENCE
POWER SUPPLY
UNIT
SIZE
48A
FAN MOTOR FAN MOTOR EXHAUST
OUTLET
VOLTAGE
3 PH, 60 Hz
Fuse or
MCA
Min Max RLA LRA RLA LRA RLA LRA RLA LRA Qty
FLA
Hp
5
FLA FLA (total)
FLA
HACR Brkr*
—
16.7
7.0
7.0
111.5
135.2
125
150
23.6
6.5
—
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
3.5
3.5
3.5
3.5
3.5
3.5
2.5
2.5
2.5
2.5
2.5
2.5
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
3.5
3.5
3.5
3.5
3.5
3.5
2.5
2.5
2.5
2.5
2.5
2.5
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
3.5
3.5
3.5
3.5
3.5
3.5
127.5
151.1
146.8
170.4
110.2
133.9
124.2
147.8
141.7
165.3
50.9
64.1
58.2
70.8
67.0
79.6
43.1
52.8
48.5
58.1
56.0
65.6
116.1
139.7
131.5
155.1
150.8
174.4
114.8
138.4
128.2
151.8
145.7
169.3
59.1
71.7
65.6
78.2
74.4
87.0
46.6
52.7
50.9
57.0
58.4
64.5
135.3
158.9
154.6
178.2
171.1
194.7
132.0
155.6
149.5
173.1
164.5
188.1
68.1
80.7
76.9
89.5
84.4
97.0
150
175
175
200
125
150
150
175
175
200
60
70
70
80
80
100
50
60
50
60
70
80
125
150
150
175
175
200
125
150
150
175
175
200
70
80
70
90
90
100
50
60
60
60
70
80
150
175
200
200
225
250
150
175
175
200
208
230
460
575
208
230
460
575
208
230
460
575
187 229 23
207 253 23
414 508 10.2
184
184
23
23
184
184
23
23
184
184
90
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
2
2
2
2
2
2
2
2
2
2
2
2
10
15
5
30.8
(ea)
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
12.6
—
12.6
—
12.6
—
9.6
46.2
15.2
6.6
(ea)
10
15
5
28.0
42.0
020
025
027
7.6
3.3
(ea)
90 10.2
90 10.2
10
15
5
14.0
21.0
6.1
2.6
(ea)
—
9.6
—
9.6
518 632
9
73
9
73
9
73
10
15
5
11.0
17.0
—
16.7
23.6
6.5
(ea)
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
12.6
—
12.6
—
12.6
187 229 21.8 184 25.6 190 25.6 190
10
15
5
30.8
46.2
15.2
6.6
(ea)
207 253 21.8 184 25.6 190 25.6 190
10
15
5
28.0
42.0
7.6
3.3
(ea)
414 508 11
90 13.5
73 10.2
95 13.5
75 10.2
95
75
10
15
5
14.0
21.0
—
6.9
6.1
2.6
(ea)
—
518 632
9
10
15
10
15
20
10
15
20
10
15
20
10
15
20
11.0
6.1
—
17.0
6.1
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
12.6
—
12.6
30.8
6.5
(ea)
187 229 25.6 190 25.6 190 25.6 190
46.2
59.4
28.0
6.6
(ea)
207 253 25.6 190 25.6 190 25.6 190
42.0
200
225
80
90
90
110
110
110
60
70
70
80
80
90
54.0
14.0
3.3
(ea)
414 508 13.5
518 632 10.2
95 13.5
75 10.2
95 13.5
75 10.2
95
75
21.0
—
12.6
—
9.6
—
9.6
27.0
2.5
2.5
2.5
2.5
2.5
2.5
52.1
61.7
59.6
69.2
65.8
75.4
11.0
2.6
(ea)
17.0
—
22.0
9.6
See Legend and Notes on page 28.
25
Table 8B — Electrical Data — 48AJ,AK,AW,AY Units with Convenience Outlet (cont)
COMPRESSOR
Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2
VOLTAGE
RANGE
CONDENSER EVAPORATOR POWER CONVENIENCE
POWER SUPPLY
UNIT
SIZE
48A
FAN MOTOR FAN MOTOR EXHAUST
OUTLET
VOLTAGE
3 PH, 60 Hz
Fuse or
MCA
Min Max RLA LRA RLA LRA RLA LRA RLA LRA Qty
FLA
Hp
10
15
20
10
15
20
10
15
20
10
15
20
15
20
25
15
20
25
15
20
25
15
20
25
15
20
25
15
20
25
15
20
25
15
20
25
FLA FLA (total)
FLA
HACR Brkr*
—
30.8
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
3.5
3.5
3.5
3.5
3.5
3.5
2.5
2.5
2.5
2.5
2.5
2.5
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
3.5
3.5
3.5
3.5
3.5
3.5
2.5
2.5
2.5
2.5
2.5
2.5
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
3.5
3.5
3.5
3.5
148.1
171.7
167.4
191.0
183.9
207.5
144.8
168.4
162.3
185.9
177.3
200.9
70.0
82.6
78.8
91.4
86.3
98.9
57.5
67.1
65.0
74.6
71.2
80.8
176.4
200.0
192.9
216.5
212.1
235.7
171.3
194.9
186.3
209.9
203.8
227.4
87.9
100.5
95.4
108.0
104.1
116.7
68.6
78.2
74.8
84.4
81.1
90.7
189.4
213.0
205.9
229.5
225.1
248.7
184.5
208.1
199.5
223.1
217.0
240.6
175
200
200
225
225
250
150
175
200
225
225
250
80
90
90
110
110
125
60
70
80
90
90
100
200
225
250
250
250
300
200
225
225
250
250
250
100
110
110
125
125
150
80
90
90
100
100
110
225
250
250
250
250
300
23.6
6.5
—
23.6
208
230
460
575
208
230
460
575
208
230
460
575
187 229 23
207 253 23
414 508 10.2
184
184
23
23
184 21.8 184 21.8 184
2
2
2
2
2
2
2
2
4
4
4
4
46.2
(ea)
—
23.6
59.4
—
23.6
28.0
6.6
(ea)
—
23.6
184 21.8 184 21.8 184
42.0
—
23.6
54.0
030
035
036
—
12.6
14.0
3.3
(ea)
—
12.6
90 10.2
90
73
11
9
90
73
11
9
90
73
21.0
—
12.6
27.0
—
9.6
11.0
2.6
(ea)
—
9.6
518 632
9
73
9
17.0
—
9.6
22.0
—
46.2
23.6
6.5
(ea)
—
23.6
187 229 21.8 184 25.6 190 25.6 190 25.6 190
59.4
—
23.6
74.8
—
23.6
42.0
6.6
(ea)
—
23.6
207 253 21.8 184 25.6 190 25.6 190 25.6 190
54.0
—
23.6
68.0
—
12.6
21.0
3.3
(ea)
—
12.6
414 508 11
90 13.5
73 10.2
95 13.5
75 10.2
95 13.5
75 10.2
95
75
27.0
—
12.6
34.0
—
17.0
9.6
2.6
(ea)
—
518 632
9
22.0
9.6
—
27.0
9.6
—
23.6
46.2
6.5
(ea)
—
23.6
187 229 21.8 184 25.6 190 25.6 190 25.6 190
59.4
—
23.6
74.8
—
23.6
225
250
250
250
250
300
110
125
125
125
125
150
90
100
42.0
6.6
(ea)
—
23.6
207 253 21.8 184 25.6 190 25.6 190 25.6 190
54.0
—
23.6
68.0
—
12.6
94.5
107.1
102.0
114.6
110.7
123.3
73.8
83.4
80.0
89.6
86.3
95.9
21.0
3.3
(ea)
—
12.6
414 508 11
90 13.5 95 13.5
95 13.5
75 10.2
95
75
27.0
—
12.6
3.5
3.5
2.5
2.5
2.5
2.5
2.5
2.5
34.0
—
9.6
17.0
2.6
(ea)
—
9.6
100
110
110
110
518 632
9
73 10.2 75 10.2
22.0
—
27.0
9.6
See Legend and Notes on page 28.
26
Table 8B — Electrical Data — 48AJ,AK,AW,AY Units with Convenience Outlet (cont)
COMPRESSOR
Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2
VOLTAGE
RANGE
CONDENSER EVAPORATOR POWER CONVENIENCE
POWER SUPPLY
UNIT
SIZE
48A
FAN MOTOR FAN MOTOR EXHAUST
OUTLET
VOLTAGE
3 PH, 60 Hz
Fuse or
MCA
Min Max RLA LRA RLA LRA RLA LRA RLA LRA Qty
FLA
Hp
15
20
25
15
20
25
15
20
25
15
20
25
15
20
25
15
20
25
15
20
25
15
20
25
20
25
30
20
25
30
20
25
30
20
25
30
FLA
46.2
59.4
74.8
42.0
54.0
68.0
21.0
27.0
34.0
17.0
22.0
27.0
46.2
59.4
74.8
42.0
54.0
68.0
21.0
27.0
34.0
17.0
22.0
27.0
59.0
75.0
88.0
54.0
68.0
80.0
27.0
34.0
40.0
22.0
27.0
32.0
FLA (total)
FLA
HACR Brkr*
—
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
3.5
3.5
3.5
3.5
3.5
3.5
2.5
2.5
2.5
2.5
2.5
2.5
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
3.5
3.5
3.5
3.5
3.5
3.5
2.5
2.5
2.5
2.5
2.5
2.5
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
3.5
3.5
3.5
3.5
210.6
234.2
227.1
250.7
246.3
269.9
205.7
229.3
220.7
244.3
238.2
261.8
102.0
114.6
109.5
122.1
118.2
130.8
80.4
90.0
86.6
96.2
92.9
102.5
210.6
234.2
227.1
250.7
246.3
269.9
205.7
229.3
220.7
244.3
238.2
261.8
102.0
114.6
109.5
122.1
118.2
130.8
80.4
90.0
86.6
96.2
92.9
102.5
257.2
280.8
276.4
300.0
292.9
316.5
250.8
274.4
250
250
250
300
300
300
225
250
250
250
300
300
110
125
125
125
150
150
90
100
100
110
110
125
250
250
250
300
300
300
225
250
250
250
300
300
110
125
125
125
150
150
90
100
100
110
110
125
300
300
350
350
350
400
300
300
23.6
6.5
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
12.6
—
12.6
—
12.6
—
9.6
—
9.6
—
9.6
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
12.6
—
12.6
—
12.6
—
9.6
—
9.6
—
9.6
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
23.6
—
12.6
—
12.6
—
12.6
208
230
460
575
208
230
460
575
208
230
460
575
187 229 25.6 190 25.6 190 34.3 265 34.3 265
2
2
2
2
4
4
4
4
4
4
4
4
(ea)
6.6
(ea)
207 253 25.6 190 25.6 190 34.3 265 34.3 265
040
041
050
3.3
(ea)
414 508 13.5
518 632 10.2
95 13.5
75 10.2
95 16.0 120 16.0 120
2.6
(ea)
75 12.9
80 12.9
80
6.5
(ea)
187 229 25.6 190 25.6 190 34.3 265 34.3 265
6.6
(ea)
207 253 25.6 190 25.6 190 34.3 265 34.3 265
3.3
(ea)
414 508 13.5 95 13.5 95
16
120
16
120
80
2.6
(ea)
518 632 10.2 75 10.2
75 12.9
80 12.9
6.5
(ea)
187 229 34.3 265 34.3 265 34.3 265
47
47
380
380
6.6
(ea)
268.3
291.9
283.3
306.9
120.9
133.5
129.6
142.2
137.1
149.7
97.7
107.3
300
350
350
350
125
150
150
175
175
175
110
125
125
125
125
150
207 253 34.3 265 34.3 265 34.3 265
3.3
(ea)
414 508 16
120
16
120
16
120 22.4 175
3.5
3.5
2.5
2.5
2.5
2.5
2.5
2.5
—
9.6
—
9.6
—
9.6
2.6
(ea)
104.0
113.6
110.2
119.8
518 632 12.9
80 12.9
80 12.9
80 18.6 140
See Legend and Notes on page 28.
27
Table 8B — Electrical Data — 48AJ,AK,AW,AY Units with Convenience Outlet (cont)
COMPRESSOR
Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2
VOLTAGE
RANGE
CONDENSER EVAPORATOR POWER CONVENIENCE
POWER SUPPLY
UNIT
SIZE
48A
FAN MOTOR FAN MOTOR EXHAUST
OUTLET
VOLTAGE
3 PH, 60 Hz
Fuse or
MCA
Min Max RLA LRA RLA LRA RLA LRA RLA LRA Qty
FLA
Hp
20
25
30
40
20
25
30
40
20
25
30
40
20
25
30
40
25
30
40
25
30
40
25
30
40
25
30
40
FLA
59.4
74.8
88
FLA (total)
FLA
HACR Brkr*
—
35.4
—
35.4
—
35.4
—
35.4
—
35.4
—
35.4
—
35.4
—
35.4
—
18.9
—
18.9
—
18.9
—
18.9
—
14.4
—
14.4
—
14.4
—
14.4
—
35.4
—
35.4
—
35.4
—
35.4
—
35.4
—
35.4
—
18.9
—
18.9
—
18.9
—
14.4
—
14.4
—
14.4
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
3.5
3.5
3.5
3.5
3.5
3.5
3.5
3.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
7.0
3.5
3.5
3.5
3.5
3.5
3.5
2.5
2.5
2.5
2.5
2.5
2.5
257.5
292.9
300
350
276.7
312.1
350
350
6.5
(ea)
208
230
460
575
187 229 34.3 265 34.3 265 34.3 265 34.3 265
6
6
6
6
293.2
328.6
350
400
325.7
361.1
400
450
114
54
251.3
286.7
300
300
268.8
304.2
300
350
68
6.6
(ea)
207 253 34.3 265 34.3 265 34.3 265 34.3 265
283.8
319.2
350
350
80
313.8
349.2
400
450
104
27
051
121.1
140.0
125
150
129.8
148.7
150
175
34
3.3
(ea)
414 508 16
120
16
120
16
120
16
120
137.3
156.2
175
175
40
152.3
171.2
200
200
52
97.2
111.6
110
125
22
103.5
117.9
125
125
27
2.6
(ea)
518 632 12.9
80 12.9
80 12.9
80 12.9
80
109.7
124.1
125
150
32
121.0
135.4
150
175
41
315.1
350.5
350
400
75.0
88.0
114.0
68.0
80.0
104.0
34.0
40.0
52.0
27.0
32.0
41.0
6.5
(ea)
331.6
367.0
400
450
208
230
460
575
187 229 40.8 265
47
47
380 40.8 265
47
47
380
380
6
6
6
6
364.1
399.5
450
500
307.2
342.6
350
400
6.6
(ea)
322.2
357.6
400
400
207 253 40.8 265
380 40.8 265
352.2
387.6
450
450
060
151.0
169.9
175
200
3.3
(ea)
158.5
177.4
175
200
414 508 20.2 135 22.4 175 20.2 135 22.4 175
173.5
192.4
225
225
122.3
136.7
125
150
2.6
(ea)
128.5
142.9
150
150
518 632 16.6 120 18.6 140 16.6 120 18.6 140
139.8
154.2
175
175
LEGEND
Full Load Amps
Example: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
FLA
—
—
—
—
—
—
HACR
LRA
MCA
NEC
RLA
Heating, Air Conditioning and Refrigeration
Locked Rotor Amps
Minimum Circuit Amps
National Electrical Code
Rated Load Amps
452 + 464 + 455
Average Voltage =
=
3
1371
3
*Fuse or HACR circuit breaker per NEC.
NOTES:
= 457
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 Canadian units may
be fuse or circuit breaker.
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
2. Unbalanced 3-Phase Supply Voltage
(AC) 457 – 455 = 2 v
Never operate a motor where a phase imbalance in supply voltage is
greater than 2%. Use the following formula to determine the percent of volt-
age imbalance.
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
7
% Voltage imbalance
% Voltage Imbalance
= 100 x
457
max voltage deviation from average voltage
= 1.53%
= 100 x
average voltage
This amount of phase imbalance is satisfactory as it is below the maximum
allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
28
Routing Through Bottom of Unit — If wiring is brought in
through bottom of unit, use field-supplied watertight conduit to
route power wiring through the 31/2-in. diameter hole provided
in the unit basepan.
IMPORTANT: On 208/230-v units, transformers 1-5 are
wired for 230-v. If 208/230-v unit is to be run with 208-v
power supply, the transformers must be rewired as follows:
Install conduit connector in unit basepan as shown in
Fig. 4-9. Route power and ground lines through connector to
terminal connections in unit control box as shown on unit
wiring diagram and Fig. 19.
Use strain relief going into control box through 35/8-in.
diameter hole provided. After wires are in unit control box,
connect to power terminal block (see Power Wiring section on
page 20).
For transformer 1 move the black wires connected to termi-
nal H2 and connect it to terminal H3.
For transformers 2-4, that are used for the 24-volt control
circuits, connect as follows:
1. Remove cap from red (208 v) wire.
2. Remove cap from spliced orange (230 v) wire. Discon-
nect orange wire from black unit power wire.
3. Cap orange wire.
4. Splice red wire and black unit power wire. Cap wires.
Low-voltage wiring must be run in watertight conduit from
7
the basepan to control box and through /8-in. diameter hole
provided in bottom of unit control box. Field-supplied strain
relief must be used going into the box. After wiring is in
control box, make connections to proper terminals on terminal
blocks (see Field Control Wiring section on this page).
Routing Through Side of Unit — Route power wiring in
field-supplied watertight conduit into unit through 21/2-in. (siz-
es 020-035) or 3-in. (sizes 036-060) hole.
Use field-supplied strain relief going into control box
through 35/8-in. diameter hole provided. After wires are in unit
control box, connect to power terminal block (see Power Wir-
ing section on page 20).
Bring low-voltage control wiring through the 7/8-in. diame-
ter hole provided in the condenser section side post. Use strain
relief going into 7/8-in. diameter hole in bottom of unit control
box.
If the unit is equipped with the optional convenience outlet
connect the yellow wire to H2 on transformer 5.
IMPORTANT: BE CERTAIN UNUSED WIRES ARE
CAPPED. Failure to do so may damage the transformers.
FIELD CONTROL WIRING — The 48A Series units sup-
port a large number of control options that can impact the field
control wiring.
The control options that the unit can provide relate to the
following parameters:
• CV (constant volume), VAV (variable air volume),
VVT® (variable volume variable temperature) or
Carrier TEMP system control operation.
• Stand-alone with a thermostat (CV) or with a space sen-
sor (CV and VAV)
After wiring is in control box, make connection to proper
terminals on terminal blocks (see Field Control Wiring section
below).
• Network application with CCN (Carrier Comfort
Network®) or other networks
• Demand ventilation with CO2 sensor
• Economizer and economizer with changeover control
• Staged gas heat
IMPORTANT: The VAV (variable air volume) units use
variable frequency drives, which generate and can radiate
radio frequency energy. If units are not installed and used
in accordance with these instructions, they may cause radio
interference. They have been tested and found to comply
with limits of a Class A computing device as defined by
FCC (Federal Communications Commission) regulations,
Subpart J of Part 15, which are designed to provide reason-
able protection against such interference when operated in
a commercial environment.
• Building and duct static pressure control
• Fire shutdown and smoke control
• Diagnostics and monitoring
For constant volume applications a thermostat (T-Stat) or
space temperature sensor (SPT) will be required.
T-STAT (Conventional Thermostat) — Unit can be con-
trolled with a Carrier-approved accessory electro-mechanical
or electronic thermostat that has two stages of cooling, two
stages of heating control and an output for indoor fan control. It
may also include time of day scheduling or use the scheduling
routines built into the ComfortLink™ controls.
WARNING
The unit must be electrically grounded in accordance with
local codes and NEC ANSI/NFPA 70 (National Fire
Protection Association). Electrical shock could cause per-
sonal injury.
Install thermostat according to the installation instructions
included with accessory thermostat and the unit wiring dia-
grams. Locate thermostat assembly on a solid interior wall in
the conditioned space to sense average temperature.
Route thermostat cable or equivalent single leads of colored
wire from subbase terminals through conduit into unit to low-
voltage connection in the main control box. For thermostat
TB4 connections see Fig. 20.
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American
Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft,
use no. 16 AWG insulated wire (35 C minimum). For over
75 ft, use no. 14 AWG insulated wire (35 C Minimum). All
wire larger than no. 18 AWG cannot be directly connected at
the thermostat and will require a junction box and splice at the
thermostat. Set heat anticipator settings as follows:
Affix crankcase heater sticker (located in the installers
packet) to unit disconnect switch.
Voltage to compressor terminals during compressor operation
must be within the voltage range indicated on the unit name-
plate. Phases must be balanced within 2%.
Use the formula in Tables 8A and 8B to determine the per-
centage of voltage imbalance.
IMPORTANT: If the supply voltage phase imbalance is
more than 2%, contact your local electric utility company
immediately.
STAGE 1
(W1) ON
STAGE 2
(W1 and W2) ON
SIZE
Unit failure as a result of operation on improper line voltage
or excessive phase imbalance constitutes abuse and may cause
damage to electrical components.
020-050
051, 060
0.24
0.36
0.13
0.13
Settings may be changed slightly to provide a greater degree of
comfort for a particular installation.
29
Staged Gas Control Option Thermistors — If the unit is
equipped with the staged gas heat option, supply-air ther-
mistors must be installed. Three supply-air thermistors are
shipped with staged gas units and are inside the heating sec-
tion. The supply-air thermistors should be located in the supply
duct with the following criteria:
FIELD-SUPPLIED THERMOSTAT
LIGHT
RC
Y1
Y2
W1
W1
W2
G
C
X
R
Y1
2
Y2
W2
5
G
6
C
7
X
R
1
• Downstream of the heat exchanger cells
a48-8243
• Equally spaced as far as possible from the heat
exchanger cells
3
4
8
TB4
• In a duct location where none of the supply-air ther-
mistors are within sight of the heat exchanger cells
• In a duct location with good mixed supply-air portion of
the unit.
Fig. 20 — Field Control Thermostat Wiring
T55 SPT
T56 SPT
SPT (Space Temperature Sensor) — For constant volume ap-
plications the ComfortLink™ controls can also be used with
T55 and T56 space temperature sensors that use a 10K ther-
mistor. The T56 sensor also has the capability for a config-
urable temperature set point offset. For variable air volume ap-
plications only the T55 sensor can be used.
C
T1
TH
T2
SN
Install sensor according to the installation instructions
included with accessory sensor. Locate sensor assembly on a
solid interior wall in the conditioned space to sense average
temperature.
1
13
14
11
12
3
4
5
6
9
7
8
15
16
UNIT
TB5
2
10
Run wiring to the space sensor as shown in Fig. 21.
a48-6854
Note that when the remote sensor is used, the red jumper
wires provided must be connected from TB4 terminal 4 to 5
and TB4 terminal 5 to 1.
Fig. 21 — Space Temperature Sensor Wiring
Both the T55 and T56 have a CCN communications port and
this should be wired to the CCN Communications TB3 board if
it is desired to have access to the CCN through the sensor. If
more than one T-55 sensor is being used and averaged, sensors
must be wired in multiples of 4 or 9 as shown in Fig. 22.
TB5
RED
3
BLK
4
SENSOR 4
SENSOR 3
SENSOR 1
SENSOR 2
SPACE TEMPERATURE AVERAGING (4 SENSOR APPLICATION)
TB5
3
4
SENSOR 1
SENSOR 2
SENSOR 3
SENSOR 6
SENSOR 5
SENSOR 4
SENSOR 9
SPACE TEMPERATURE AVERAGING (9 SENSOR APPLICATION)
SENSOR 8
SENSOR 7
a48-6855
NOTE: Use T55 sensor only.
Fig. 22 — Space Temperature Averaging Wiring
30
T58 Communicating Thermostat — Carrier also has a fully
communicating thermostat which, if used, will be wired to the
CCN communication connections on TB3 as described in the
Carrier Comfort Network® Interface section below.
c. Insert and secure the black (–) wire to terminal 3 of
the 3-pin plug.
4. Insert the plug into the existing 3-pin mating connector on
the base module in the main control box.
Carrier Comfort Network Interface — The rooftop units can
be connected to the CCN system. The communication bus
wiring is supplied and installed in the field. Wiring consists of
shielded, 3-conductor cable with drain wire. The system
elements are connected to the communication bus in a daisy
chain arrangement. The positive pin of each system element
communication connector must be wired to the positive pins of
the system element on either side of it, the negative pins must be
wired to the negative pins, and the signal pins must be wired to
signal ground pins. Wiring connections for CCN should be
made at the TB3 terminal block using the screw terminals. The
TB3 board also contains an RJ14 CCN plug that can be used to
connect a field service computer or other CCN device tempo-
rarily. There is also an RJ14 LEN (local equipment network)
connection that is used to connect a Navigator™ device or
download software.
Conductors and drain wire must be 20 AWG minimum
stranded, tinned copper. Individual conductors must be insulat-
ed with PVC, PVC/nylon, vinyl, Teflon, or polyethylene. An
aluminum/polyester 100% foil shield and an outer jacket of
PVC, PVC/nylon, chrome vinyl, or Teflon with a minimum
operating temperature range of –20 C to 60 C (–4 F to 140 F) is
required. Table 9 lists cables that meet the requirements.
VAV Units with Heat — For variable air volume units that
will use heat, the variable air volume terminals should be
interlocked with the unit at TB5 terminals 1 and 2.
Demand Ventilation — The unit can be equipped with a CO2
sensor for use in demand ventilation. This can be factory
supplied and will be mounted in the return duct. It can also be
field supplied and mounted in the return duct or in the space.
Connect the field-installed 4 to 20 mA sensor to TB5 terminal
6 and 7. Do not remove the factory-installed 182-ohm resistor.
If an outdoor air quality sensor is used then it should be
wired to terminal 11 and 12 on TB6. This will require the use
of the optional controls expansion module.
Remote IAQ Override — If the control is being used with non
Carrier building management system it supports the use of the
remote IAQ override switch. This should be connected to
TB6 terminal 13 and 14. Use of this will require the optional
controls expansion module.
Remote Economizer Position Control — The ComfortLink™
controls will normally control the position of the economizer,
but it can also support field control of the economizer position
through a 4 to 20 mA signal. If this is used it should be con-
nected to TB5 terminal 6 and 7. If the signal is a 4 to 20 mA
signal then leave the 182-ohm resistor in place.
Remote Economizer Enable — If the control is being used
with other building management systems and the system will
control the enabling and disabling of the economizer free cool-
ing, this switch input can be connected to TB6 terminals 1 and
2. Note that the controls also support integrated economizer
changeover using outdoor dry bulb, differential dry bulb,
outdoor enthalpy and differential enthalpy.
Table 9 — CCN Connection Approved Shield Cable
MANUFACTURER
Alpha
American
Belden
CABLE PART NO.
2413 or 5463
A22503
8772
Columbia
02525
IMPORTANT: When connecting to CCN communi-
cation bus to system elements, use color coding
system for the entire network to simplify installation
and checkout. See Table 10.
Remote Occupancy Switch — For interface to other building
management systems the control also supports a switch input
for remote occupancy signals. This wiring should be connected
to terminal TB6 terminal 1 and 3.
Remote Economizer Minimum Position Control — If the
ComfortLink control is controlling the economizer, but a remote
minimum position is required, then an external 100K potentiom-
eter can be connected to TB5 terminal 6 and 7. Remove the
factory-installed 182-ohm resistor.
Smoke Sensor Interface — The ComfortLink control includes
an optional factory-installed return air smoke detector. Remote
alarm circuits can be wired to TB5 terminal 8 and 9.
Table 10 — Color Code Recommendations
CCN BUS CONDUCTOR
INSULATION COLOR
CCN PLUG PIN
NO.
SIGNAL TYPE
Positive (+)
Ground
Negative (–)
RED
WHITE
BLACK
1
2
3
If a cable with a different color scheme is selected, a similar
color code should be adopted for the entire network. At each
system element, the shields of the communication bus cables
must be tied together. If the communication bus is entirely
within one building, the resulting continuous shield must be
connected to a ground at one point only. If the communication
bus cable exits from one building and enters another, the
shields must be connected to grounds at the lightning suppres-
sor in each building where the cable enters or exits the building
(one point per building only).
To connect the unit to the network:
1. Turn off power to the control box.
2. Cut the CCN wire and strip the ends of the red (+), white
(ground), and black (–) conductors. (If a different net-
work color scheme is used, substitute appropriate colors.)
Fire Shutdown and Smoke Control — The control supports
interface to fire and smoke control systems and allows for the
following system overrides from remote switch inputs.
•
•
Fire Shutdown — Connect to TB6 terminals 8 and 9.
Smoke Pressurization — Connect to TB6 terminal 12
and 13. This requires the use of the optional controls
expansion module.
•
•
Smoke Evacuation — Connect to TB6 terminal 12 and
14. This requires the use of the optional controls expan-
sion module.
Smoke Purge — Connect to TB6 terminal 12 and 15.
This requires the use of the optional controls expansion
module.
Demand Limiting — The control can also be used with demand
limiting control from remote building management systems. If a
two stage system is going to be used with Redline Limiting
where the machine is not allowed to increase load and Load Shed
where the load is decreased to a configurable limit in capacity
then these can be connected to TB6 terminals 4 and 5 and 5 and
6. This requires use of the controls expansion module.
3. Remove the 3-pin male plug from the base control board
in the main control box, and connect the wires as follows:
a. Insert and secure the red (+) wire to terminal 1 of
the 3-pin plug.
b. Insert and secure the white (ground) wire to termi-
nal 2 of the 3-pin plug.
31
Step 9 — Make Outdoor-Air Inlet Adjustments
ECONOMIZER AND FIXED OUTDOOR AIR
DAMPER — Hoods are used on all units with economizer or
adjustable self-closing fixed outdoor air damper.
NOTE: If accessory power exhaust or barometric relief pack-
ages are being added to the unit, install power exhaust or baro-
metric relief before installing economizer hoods.
TOP
FLANGE
BLACK
SEAL
STRIP
HOOD SIDE
Economizer Hood Assembly — The economizer hood is
shipped in a package secured to the outside of the unit. The
hood assemblies must be field-assembled. The 48AW,AY units
are side supply and side return. The return duct limits access to
economizer filters from below.
The 48AJ,AK,AW,AY020-050 units have two hoods on ev-
ery unit. The 48AJ,AK,AW,AY051 and 060 units have 3 hoods
on every unit.
NOTE: Before assembly of the economizer hood, check along
the outer edges of the economizer assembly for any seal strip
protruding past the flanges. Trim the excess seal strip so that it
is flush with the economizer assembly flanges.
Fig. 23 — Adding Seal Strip to Top of Hood Sides
Perform the following procedure to assemble the economizer
hood.
a48-8498
1. Apply black seal strip (provided) to outside top-edge of
hood sides. Wrap seal strip over edge to cover top flange
(6 hood sides). Make sure seal strip covers screw holes.
Allow strip to overhang 1/8-in. past the end opposite the
mounting flange. See Fig. 23.
2. Assemble hood sides, top, and cross member with
gasketed screws provided. See Fig. 24.
3. Attach 15 green speed clips (provided) to hood top.
4. Apply black seal strip (provided) to mounting flanges of
hood sides being sure to cover mounting holes. See
Fig. 25.
5. Apply black seal strip (provided) to back of hood top
mounting flange. Seal strip of hood top mounting flange
must press tightly against seal strip of hood side mount-
ing flanges. See Fig. 26.
6. Add gray foam strip (provided) to cross members on bot-
tom tray. See Fig. 27.
7. Attach gray foam strip (provided) to block-off baffle on
outer face of flange. See Fig. 28.
8. Remove the screws on each end and along top of damper
assembly of unit. Remove top 4 screws on each side of
filter panel under damper assembly. Set hood assembly in
place and attach to unit using these screws.
Fig. 24 — Economizer Hood Assembly
(Right Side/Center Economizer Hood Shown)
9. Remove screws along bottom of damper assembly.
Locate and mount block-off baffle using these screws.
10. Assemble 2 filter tracks side-by-side with the assembled
ends together.
11. Attach one mounting angle to the assembled end of the
filter track. See Fig. 29.
MOUNTING
FLANGE
12. Attach 9 green speed clips (provided) to hood side panels.
Engagement section of clip faces up and towards the out-
side of the hood side panels.
HOOD SIDE
13. Attach remaining mounting angle to other end of the filter
track with no. 10 screws provided.
14. Place filter track assembly in bottom of hood by attaching
to hood with speed clips and gasketed screws provided.
NOTE: Be sure the filters are installed with the airflow in the
correct direction.
15. Attach black seal strip (provided) to filter cover. Seal strip
should be applied centered over the holes of the one
flange, making sure to fully cover holes and centered over
the other large flange. See Fig. 30.
16. Slide two 20 x 25-in. filters into cross members of hood
assembly. Attach filter cover over filters with screws and
speed clips provided.
Fig. 25 — Adding Seal Strip to Sides of Hood Top
Mounting Flange
32
HOOD TOP
MOUNTING ANGLE
HOOD SIDE
FILTER TRACK
ASSEMBLY
a48-8499
Fig. 29 — Mounting Angle Attached
to Filter Track Assembly
48-1104
BLACK SEAL STRIP
(CENTERED)
Fig. 26 — Adding Seal Strip to Back of Hood Top
Mounting Flange
GRAY FOAM STRIP
FILTER COVER
CROSS MEMBER
48-1110
Fig. 30 — Attaching Seal Strip to Filter Cover
Step 10 — Position Power Exhaust/Barometric
Relief Damper Hood — All units are shipped with the
hoods folded inside the unit in a shipping position. For 48AJ,
and AK units the hood must be tilted out once the unit is in-
stalled. On 48AW, AY units, (designed for horizontal supply
and return) the assemblies will have to be relocated to return
ductwork. See Fig. 31 for dimensions and details.
48-1105
Fig. 27 — Adding Foam Strip to Cross Member
All electrical connections have been made and adjusted at
the factory. The power exhaust blowers and barometric relief
dampers are shipped assembled and tilted back into the unit for
shipping. Brackets and extra screws are shipped in shrink wrap
around the dampers. If ordered, each unit will have 4
(48AJ,AK,AW,AY020-050 units) or 6 (48AJ,AK,AW,AY051
and 060 units) power exhaust blowers and motors or baromet-
ric relief dampers.
BLOCKOFF BAFFLE
1. Remove 9 screws holding each damper assembly in
place. See Fig. 32. Each damper assembly is secured with
3 screws on each side and 3 screws along the bottom.
Save screws.
GRAY FOAM STRIP
CAUTION
Be careful when tilting blower assembly. Hoods and blow-
ers are heavy and can cause injury if dropped.
2. Pivot each damper assembly outward until edges of
damper assembly rest against inside wall of unit.
3. Secure each damper assembly to unit with 6 screws
across top (3 screws provided) and bottom (3 screws
from Step 1) of damper.
a48-4328
4. With screws saved from Step 1, install brackets on each
side of damper assembly.
5. Remove tape from damper blades.
Fig. 28 — Adding Seal Strip to Block-Off Baffle
33
ECONOMIZER
HOOD
42.56”
LOCATION
BAROMETRIC RELIEF
OR POWER EXHAUST
“SIDE #2”
ECONOMIZER
HOOD
23.28”
TYP
“END #2”
42” MIN.
12.94
(UNIT
OPENING)
R/A
S/A
“SIDE #1”
“END #1”
J BOX
23.28”
42.62”
PLENUM RATED
CABLE
(FIELD SUPPLIED)
42.62
TYP
ALTERNATE
LOCATION
(END)
J BOX
S/A
R/A
NOTE: 020-050 SIZES SHOWN (2 POWER EXHAUST FANS).
SIZES 051 AND 060 HAVE 3 POWER EXHAUST FANS. ALL
UNIT SIZES HAVE THE SAME SIZE POWER EXHAUST.
a48-8244
Fig. 31 — Power Exhaust Relocated to Side Return Duct
a48-3808
NOTES:
1. Unless otherwise specified, all dimensions are to outside of part.
2. Dimensions are in inches.
3. On 48AW,AY units, accessory barometric relief or power exhaust must be mounted in the field-supplied return ductwork.
Fig. 32 — Barometric Relief Damper and Power Exhaust Mounting Details
lower inner panel. See Fig. 33. A section of field-supplied
1/4-in. plastic tubing must be run from the high pressure tap on
the differential pressure switch to the conditioned space. The
pressure tube must be terminated in the conditioned space
where a constant pressure is required. This location is usually
in an entrance lobby so that the building exterior doors will
open and close properly. Remove plug button in panel to route
tubing.
Step 11 — Route VAV Static Pressure Sensors
VAV DUCT PRESSURE TRANSDUCER — The VAV duct
pressure transducer (VAV inverter pressure transducer) is locat-
ed behind the filter access door on the lower inner panel. See
Fig. 33. A section of field-supplied 1/4-in. plastic tubing must
be run from the high pressure tap on the differential pressure
switch and connected to a field-supplied tap in the supply-air
duct. The tap is usually located 2/3 of the way out on the main
supply duct. Remove plug button in panel to route tubing.
The low pressure tap is factory-routed to the atmosphere.
For a positive-pressure building, route the high tap to building
air and low tap to atmosphere. For a negative-pressure
VAV BUILDING PRESSURE TRANSDUCER — The VAV
building pressure transducer (modulating power exhaust pres-
sure transducer) is located behind the filter access door on the
34
building, route the high tap to atmosphere and the low tap to
building air.
capable of supporting the weight of a person. The return
ductwork connection locations on the side of the unit are higher
than normal (31-in. high). Unit-mounted power exhaust or
barometric relief cannot be used because of return air ductwork
will cover the power exhaust or barometric relief installation
locations. Power exhaust or barometric relief may be installed
in the return air ductwork.
Step 12 — Install All Accessories — After all the
factory-installed options have been adjusted, install all field-
installed accessories. Refer to the accessory installation instruc-
tions included with each accessory.
The 48A Series units have a large number of factory-
installed options which were previously available only as
accessories. Some of the available options can also be installed
in the field if needed. In most cases the units have been
pre-wired so that the accessories can be easily installed.
Instructions are shipped with each accessory. Configuration of
the controls for these accessories as well as the factory-installed
options can be found in the Controls, Start-Up, Operation,
Service and Troubleshooting Book. The following is a list of
some of the common accessories:
To convert the unit, perform the following:
1. Seal the bottom return openings of the unit with airtight
panels capable of supporting the weight of a person.
2. Remove the panels located below the economizer
outdoor-air dampers. These openings will be used for the
return-air ductwork. There are 2 panels on 48AJ,AK020-
050 units. There are 3 panels on 48AJ,AK051 and 060
and units. These openings are normally used for power
exhaust or barometric relief.
3. Run the return air ductwork up to the openings. One
single duct is recommended to connect to the unit over
the return air openings. See Fig. 34. The return duct must
• Thermostats and space temperature sensors
• LP (liquid propane) conversion kit
• Accessory barometric relief damper
• Accessory power exhaust
• Non-modulating to modulating power exhaust
• Condenser coil hail guards
3
incorporate a minimum /4-in. flange for connection to
the unit cabinet. The unit does not have duct flanges for
this conversion.
• Outdoor humidity sensor (used for economizer enthalpy
changeover)
• Return air humidity sensors (used for economizer
differential enthalpy changeover)
• Return air smoke detector
• Controls expansion module (used for interface to build-
ing management systems, not typically needed on
system with the Carrier Comfort Network® [CCN] sys-
tem)
• Plugged filter sensor
• Motormaster® V low ambient head pressure control
Side Supply and Return Units (48AW,AY) with Field-
Installed Power Exhaust in Return Duct — Space must be
available in the return duct to mount the power exhaust fan
(gravity relief) modules. Dimensions and suggested locations
are shown in Fig. 34. These instructions are a guideline and not
a comprehensive procedure. The design contractor must pro-
vide some design initiative.
The wiring harness that is provided with the power exhaust
accessory is not long enough for the fan modules to be mount-
ed in the return air duct. Field-supplied wiring must be spliced
into the harness. Use a junction box at each splice. The wiring
may be run in the return duct, or externally in conduit. A ser-
vice access panel will be needed near each power exhaust fan.
IMPORTANT: Carrier recommends the installation of
field-fabricated wind baffles on all vertically oriented
condenser coils when operating in environments with
prevailing winds of more than 5 MPH and where tem-
peratures drop below 32 F. See the Motormaster
accessory installation guide for instructions.
Step 13 — Field Modifications
DUCTWORK
Bottom Return Units (48AJ and AK) Field-Modified for
Side Return — The 48AJ and AK units with bottom return air
connections may be field-modified to accommodate side return
air connections.
IMPORTANT: The following section is a guideline and not
a comprehensive procedure to field modify the units. The
installing contractor must provide some design initiative.
Field-conversion is complex and is not recommended.
Units with electric heat must not be converted because of
potential heating mode operating problems.
AUXILIARY
CONTROL BOX
PRESSURE TRANSDUCERS
(INSIDE OF PANEL)
a48-6976
Fig. 33 — Pressure Transducer Locations
Conversion to horizontal return requires that the bottom
return openings of the unit must be sealed with airtight panels
35
97.78” (020-050), 150.47” (051 AND 060)
INSIDE DIMENSION
RA
31.25”
INSIDE
a48-8245
Fig. 34 — Side Return Air Conversion
Copyright 2009 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480067-01 Printed in U.S.A. Form 48A-7SI Pg 36 8-09 Replaces: 48A-5SI
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