Filter
Top Products
15
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 050 051 060
NOMINAL CAPACITY (tons) 50 50 60
BASE UNIT See Operating Weights Table
OPERATING WEIGHT (lb)
COMPRESSOR
Quantity ... Type (Ckt 1/Ckt 2)
2…SM125/1…SM125,
1…SM175
2…SM125/2…SM125
1..SM160,1..SM175/
1..SM160,1..SM175
Number of Refrigerant Circuits 22 2
Oil (oz) (Ckt 1, Ckt 2) Precharged Precharged Precharged
REFRIGERANT TYPE R-22
Operating Charge (lb-oz)
Circuit 1 64-4 98-0 81-0
Circuit 2 58-8 98-0 81-0
CONDENSER COIL* Internally Enhanced,
3
/
8
″ Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins
Quantity 22 2
Rows ... Fins/in. 4 ... 15 4…15 4…15
Total Face Area (sq ft) 66.7 100 100
CONDENSER FAN Propeller Type
Nominal Cfm 25,600 38,400 38,400
Quantity... Diameter (in.) 4 ... 30 6...30 6 ... 30
Motor Hp 11 1
EVAPORATOR COIL Internally Enhanced Copper Tubes, Aluminum Plate Fins with Intertwined Circuits
Tube Size (in.)
1
/
2
1
/
2
1
/
2
Rows ... Fins/in. 6 ... 16 4...17 4 ... 17
Total Face Area (sq ft) 31.3 48.1 48.1
EVAPORATOR FAN Centrifugal Type
Quantity ... Size (in.) 2 ... 20 X 15 3...20 X 15 3 ... 20 X 15
Type Drive Belt Belt Belt
Nominal Cfm 20,000 20,000 24,000
Motor Hp 20 25 30 20 25 30
40
(High Eff.)
40
(Prem. Eff.)
25 30
40
(High Eff.)
40
(Prem. Eff.)
Motor Frame Size 256T 284T 286T 256T 284T 286T 324T 324T 284T 286T 324T 324T
Motor Bearing Type Ball Ball Ball
Maximum Allowable Rpm 1300 1200 1200
Motor Pulley Pitch Diameter (in.) 5.7 6.2 6.7 5.9 5.3 5.9 6.5 9.5 5.3 5.9 6.5 9.5
Nominal Motor Shaft Diameter (in.) 1
5
/
8
1
7
/
8
1
7
/
8
1
5
/
8
1
7
/
8
1
7
/
8
2
1
/
8
2
1
/
8
1
7
/
8
1
7
/
8
2
1
/
8
2
1
/
8
Fan Pulley Pitch Diameter (in.) 9.5 9.5 9.5 11.1 9.1 9.5 9.5 13.7 9.1 9.5 9.5 13.7
Nominal Fan Shaft Diameter (in.) 1
15
/
16
1
15
/
16
1
15
/
16
Belt Quantity 2222333 2 333 2
Belt Type 5VX550 5VX570 5VX570 5VX560 5VX530 5VX550 5VX570 5VX650 5VX530 5VX550 5VX570 5VX650
Belt Length (in.) 55 57 57 56 53 55 57 65 53 55 57 65
Pulley Center Line Distance (in.) 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 15.2-17.5 14.7-17.2 14.2-17.0 14.2-17.0
Factory Speed Setting (rpm) 1061 1154 1249 930 1019 1086 1197 1214 1019 1086 1197 1214
FURNACE SECTION
Supply Line Pressure Range 5.0-in. wg min/13.5-in. wg max.
Rollout Switch Cutout
Temp (F)† 225 225 225
Burner Orifice Diameter (in ...drill size)
Natural Gas Std .120 ... 31 .120...31 .120 ... 31
Liquid Propane Alt .096 ... 41 .096...41 .096 ... 41
Thermostat Heat Anticipator Setting
Stage 1 (amps) 0.24 0.1 0.36
Stage 2 (amps) 0.13 0.1 0.13
Gas Input (Btuh) Stage 1
(Low Heat/High Heat)
300,000/600,000 582,000/873,000 582,000/873,000
Stage 2
(Low Heat/High Heat)
400,000/800,000 776,000/1,164,000 776,000/1,164,000
Efficiency (Steady State) (%) 82 82 82
Temperature Rise Range 10-40/30-60 10-40/30-60 10-40/30-60
Manifold Pressure (in. wg)
Natural Gas Std 3.5 3.3 3.3
Liquid Propane Alt 3.5 3.3 3.3
Gas Valve Quantity 23 3
HIGH-PRESSURE SWITCH (psig)
Cutout 426 426 426
Reset (Auto.) 320 320 320
MIXED-AIR FILTERS
Quantity ... Size (in.) Standard 10 ... 20 x 24 x 2 16...20 x 24 x 2
8...20 x 20 x 4
8...20 x 24 x 4
16 ... 20 x 24 x 2
Pleated 5 ... 20 x 20 x 4
5 ... 20 x 24 x 4
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 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
11 x 10
6...1
11 x 10 Fan, Diameter...Width (in.)
Al — Aluminum
Cu — Copper