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Table 1 — Physical Data — 48AJ,AK,AW,AY Units (cont)
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 035 036 040 041
NOMINAL CAPACITY (tons) 35 35 40
40
BASE UNIT See Operating Weights Table
OPERATING WEIGHT (lb)
COMPRESSOR
Quantity ... Type (Ckt 1/Ckt 2)
1…SR*812AT,
1…SR*942AT/2…SR*942AT
1…SR*812AT,
1…SR*942AT/2…SR*942AT
2…SR*942AT/2…SM125 2…SR*942AT/2…SM125
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 33-0 36-0 36-0 47-0
Circuit 2 38-0 58-0 47-0 47-0
CONDENSER COIL* Internally Enhanced,
3
/
8
″ Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins
Quantity 1222
Rows ... Fins/in. 4 ... 15 2...15/4…15 2 ... 15 / 4 … 15 4...15/4…15
Total Face Area (sq ft) 33.3 66.7 66.7 66.7
CONDENSER FAN Propeller Type
Nominal Cfm 14,500 30,000 30,000 30,000
Quantity... Diameter (in.) 2 ... 30 4...30 4 ... 30 4...30
Motor Hp 1111
EVAPORATOR COIL Internally Enhanced Copper Tubes, Aluminum Plate Fins with Intertwined Circuits
Tube Size (in.)
1
/
2
1
/
2
1
/
2
1
/
2
Rows ... Fins/in. 6 ... 16 4...17 4 ... 16 4...17
Total Face Area (sq ft) 31.3 31.3 31.3 31.3
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 14,000 14,000 16,000 16,000
Motor Hp 15 20 25 15 20 25 15 20 25 15 20 25
Motor Frame Size 254T 256T 284T 254T 256T 284T 254T 256T 284T 254T 256T 284T
Motor Bearing Type Ball Ball Ball Ball
Maximum Allowable Rpm 1300 1300 1300 1300
Motor Pulley Pitch Diameter (in.) 5.15.76.25.35.77.55.35.77.55.35.77.5
Nominal Motor Shaft Diameter (in.) 1
5
/
8
1
5
/
8
1
7
/
8
1
5
/
8
1
5
/
8
1
7
/
8
1
5
/
8
1
5
/
8
1
7
/
8
1
5
/
8
1
5
/
8
1
7
/
8
Fan Pulley Pitch Diameter (in.) 8.7 8.7 8.7 9.5 9.5 11.1 9.5 9.5 11.1 9.5 9.5 11.1
Nominal Fan Shaft Diameter (in.) 1
15
/
16
1
15
/
16
1
15
/
16
1
15
/
16
Belt Quantity 222222222222
Belt Type 5VX500 5VX530 5VX550 5VX530 5VX550 5VX590 5VX530 5VX550 5VX590 5VX530 5VX550 5VX590
Belt Length (in.) 50 53 55 53 55 59 53 55 59 53 55 59
Pulley Center Line Distance (in.) 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
Factory Speed Setting (rpm) 1005 1147 1247 976 1050 1182 976 1050 1182 976 1050 1182
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 .120...31 .120 ... 31 .120...31
Liquid Propane Alt .089 ... 43 .096...41 .096 ... 41 .096...41
Thermostat Heat Anticipator Setting
Stage 1 (amps) 0.24 0.1 0.24 0.1
Stage 2 (amps) 0.13 0.1 0.13 0.1
Gas Input (Btuh) Stage 1
(Low Heat/High Heat)
262,500/394,000 300,000/600,000 300,000/600,000 300,000/600,000
Stage 2
(Low Heat/High Heat)
350,000/525,000 400,000/800,000 400,000/800,000 400,000/800,000
Efficiency (Steady State) (%) 82 82 82 82
Temperature Rise Range 15-45/35-65 10-40/30-60 10-40/3 -60 10-40/30-60
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
5...20 x 20 x 4
5...20 x 20 x 4
10 ... 20 x 24 x 2 10...20 x 24 x 2
5...20 x 20 x 4
5...20 x 20 x 4
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
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