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Table 1A — Physical Data — 48AJ,AK,AW,AY Units
LEGEND *Sizes 020-030: Circuit 1 uses the lower portion of condenser coil, Circuit 2 uses the upper
portion.
Sizes 035-050: Circuit 1 uses the left condenser coil, Circuit 2 the right. All units have
intertwined evaporator coils.
†Rollout switch is manual reset.
NOTE: High heat is for 48AJ,AW only.
UNIT 48AJ,AK,AW,AY 020D/E 025D/E 027D/E 030D/E
NOMINAL CAPACITY (tons) 20 25 27 30
BASE UNIT OPERATING WEIGHT (lb) See Operating Weights Table 2.
COMPRESSOR
Quantity...Type (Ckt 1 , Ckt 2) 1...06D328, 1...06D818 2...06D328 2...06D328 1...06D537, 1…06D328
Number of Refrigerant Circuits 2222
Oil (oz) (Ckt 1 , Ckt 2) 115, 88 115 ea. 115 ea. 115 ea.
REFRIGERANT TYPE R-22
Operating Charge (lb-oz)
Circuit 1 25-0 25-0 29-0 27-0
Circuit 2 31-0 25-0 28-0 29-0
CONDENSER COIL * Cross-Hatched
3
/
8
" Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins
Quantity 1111
Rows...Fins/in. 4...15 4...15 4...15 4...15
Total Face Area (sq ft) 33.333.333.333.3
CONDENSER FAN Propeller Type
Nominal Cfm 13,420 13,420 13,420 13,420
Quantity...Diameter (in.) 2...30 2...30 2...30 2...30
Motor Hp 1111
EVAPORATOR COIL Cross-Hatched Copper Tubes, Aluminum Plate Fins
Tube Size (in.)
3
/
8
3
/
8
3
/
8
3
/
8
Rows...Fins/in. 4...15 4...15 4...15 4... 5
Total Face Area (sq ft) 31.731.734.734.7
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 7.5 10 15 10 15 20 10 15 20
Motor Frame Size 184T 215T 254T 213T 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 4.9 4.4 5.7 5.4 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
3
/
8
1
3
/
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 9.0 9.1 8.7
Nominal Fan Shaft Diameter (in.) 1
15
/
16
1
15
/
16
1
15
/
16
1
15
/
16
Belt Quantity 122112222222
Belt Type BX56 BX50 5VX530 BX56 5VX590 5VX570 BX50 5VX500 5VX530 BX50 5VX530 5VX530
Belt Length (in.) 56 63 53 56 59 57 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) 717 924 1096 773 962 1106 848 1059 1187 884 1096 1187
FURNACE SECTION
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) 0.10.10.10.1
Stage 2 (amps) 0.10.10.10.1
Gas Input (Btuh) Stage 1 262,500/394,000 262,500/394,000 262,500/394,000 262,500/394,000
S t ag e 2 350,000/525,000 350,000/525,000 350,000/525,000 350,000/525,000
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 3.53.53.53.5
Liquid Propane Alt 3.53.53.53.5
Gas Valve Quantity 2222
HIGH-PRESSURE SWITCH (psig)
Cutout 426 426 426 426
Reset (Auto.) 320 320 320 320
LOW-PRESSURE SWITCH (psig)
Cutout 27 27 27 27
Reset (Auto.) 67 67 67 67
RETURN-AIR FILTERS
Quantity...Size (in.) 10...20 x 24 x 2 10...20 x 24 x 2 10...20 x 24 x 2 10...20 x 24 x 2
OUTDOOR AIR FILTERS 8...16 x 25 8...16 x 25 8...16 x 25 8...16 x 25
Quantity...Size (in.) 4...20 x 25 4...20 x 25 4..20 x 25 4...20 x 25
Al — Aluminum
Bhp — Brake Horsepower
Cu — Copper