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Table 1 — Physical Data — 48AJ,AK,AW,AY Units
LEGEND *Sizes 020-040: Circuit 1 uses the lower portion of condenser coil, Circuit 2 uses the upper
portion.
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.
UNIT 48AJ,AK,AW,AY 020 025 027 030
NOMINAL CAPACITY (tons) 20 25 27 30
BASE UNIT See Operating Weights Table
OPERATING WEIGHT (lb)
COMPRESSOR
Quantity ... Type (Ckt 1/Ckt 2) 2…SR*782AT/1…SR*782AE
1…SR*812AT, 1…SR*942AT/
1…SR*942AE
2 ... SR*942AT/1…SR*942AE 2…SR*782AT/2…SR*812AT
Number of Refrigerant Circuits 2222
Oil (oz) (Ckt 1, Ckt 2) Precharged Precharged Precharged Precharged
REFRIGERANT TYPE R-22
Operating Charge (lb-oz)
Circuit 1 26-8 33-8 35-8 29-0
Circuit 2 14-0 17-8 20-0 30-8
CONDENSER COIL* Internally Enhanced,
3
/
8
″ Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins
Quantity 1111
Rows ... Fins/in. 2 ... 15 3 ... 15 3 ... 15 4 ... 15
Total Face Area (sq ft) 33.3 33.3 33.3 33.3
CONDENSER FAN Propeller Type
Nominal Cfm 17,200 15,850 15,850 14,500
Quantity... Diameter (in.) 2 ... 30 2 ... 30 2 ... 30 2 ... 30
Motor Hp 1111
EVAPORATOR COIL Internally Enhanced Copper Tubes, Aluminum Plate Fins with Intertwined Circuits
Tube Size (in.)
3
/
8
3
/
8
3
/
8
3
/
8
Rows ... Fins/in. 3 ... 15 3 ... 15 4 ... 15 4 ... 15
Total Face Area (sq ft) 31.7 31.7 31.7 31.7
EVAPORATOR FAN Centrifugal Type
Quantity ... Size (in.) 2 ... 20 X 15 2 ... 20 X 15 2 ... 20 X 15 2 ... 20 X 15
Type Drive Belt Belt Belt Belt
Nominal Cfm 8,000 10,000 11,000 12,000
Motor Hp 5 10 15 5 10 15 10 15 20 10 15 20
Motor Frame Size 184T 215T 254T 184T 215T 254T 215T 254T 256T 215T 254T 256T
Motor Bearing Type Ball Ball Ball Ball
Maximum Allowable Rpm 1200 1200 1200 1200
Motor Pulley Pitch Diameter (in.) 4.8 4.4 5.7 4.8 6.1 5.5 4.4 4.9 5.9 4.4 5.7 5.9
Nominal Motor Shaft Diameter (in.) 1
1
/
8
1
3
/
8
1
5
/
8
1
1
/
8
1
3
/
8
1
5
/
8
1
3
/
8
1
5
/
8
1
5
/
8
1
3
/
8
1
5
/
8
1
5
/
8
Fan Pulley Pitch Diameter (in.) 12.4 8.6 9.1 12.4 11.1 8.7 9.4 8.1 8.7 9.5 9.1 8.7
Nominal Fan Shaft Diameter (in.) 1
15
/
16
1
15
/
16
1
15
/
16
1
15
/
16
Belt Quantity 1121 1 2 222222
Belt Type BX56 BX50 5VX530 BX56 5VX570 5VX530 BX50 5VX530 5VX530 BX50 5VX530 5VX530
Belt Length (in.) 56 63 53 56 57 53 50 50 53 50 53 53
Pulley Center Line Distance (in.) 16.0-18.7 15.6-18.4 15.0-17.9 15.6-18.4 15.6-18.4 15.0-17.9 15.6-18.4 15.0-17.9 15.0-17.9 15.6-18.4 15.0-17.9 15.0-17.9
Factory Speed Setting (rpm) 677 895 1096 677 962 1106 819 1096 1187 884 1096 1187
FURNACE SECTION
Supply Line Pressure Range 5.0-in. wg min/13.5-in. wg max.
Rollout Switch Cutout
Temp (F)† 225 225 225 225
Burner Orifice Diameter (in. ...drill size)
Natural Gas Std .111 ... 34 .111 ... 34 .111 ... 34 .111 ... 34
Liquid Propane Alt .089 ... 43 .089 ... 43 .089 ... 43 .089 ... 43
Thermostat Heat Anticipator Setting
Stage 1 (amps) 0.24 0.24 0.24 0.24
Stage 2 (amps) 0.13 0.13 0.13 0.13
Gas Input (Btuh) Stage 1
(Low Heat/High Heat)
262,500/394,000 262,500/394,000 262,500/394,000 262,500/394,000
Stage 2
(Low Heat/High Heat)
350,000/525,000 350,000/525,000 350,000/525,000 350,000/525,000
Efficiency (Steady State) (%) 82 82 82 82
Temperature Rise Range 15-45/35-65 15-45/35-65 15-45/35-65 15-45/35-65
Manifold Pressure (in. wg)
Natural Gas Std 3.5 3.5 3.5 3.5
Liquid Propane Alt 3.5 3.5 3.5 3.5
Gas Valve Quantity 2222
HIGH-PRESSURE SWITCH (psig)
Cutout 426 426 426 426
Reset (Auto.) 320 320 320 320
MIXED-AIR FILTERS
Quantity ... Size (in.) Standard 10 ... 20 x 24 x 2 10 ... 20 x 24 x 2 10 ... 20 x 24 x 2 10 ... 20 x 24 x 2
Pleated 5 ... 20 x 20 x 4
5 ... 20 x 24 x 4
5 ... 20 x 20 x 4
5 ... 20 x 24 x 4
5 ... 20 x 20 x 4
5 ... 20 x 24 x 4
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
POWER EXHAUST
Direct Drive, Single-Phase Motors (Factory-Wired for High Speed Operation), Forward-Curved Fan Wheels with Backdraft Dampers on Each Fan
Housing
Motor, Quantity...Hp 4...1
Fan, Diameter...Width (in.) 11 x 10
Al — Aluminum
Cu — Copper