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Table 1 — Physical Data — 48A2,A3,A4,A5 Units
LEGEND *Sizes 020 to 027: Circuit 1 uses the lower portion of condenser coil, Circuit
2 uses the upper portion.
Sizes 030 and 035: Circuit 1 uses the upper portion of condenser coil, Cir-
cuit 2 uses the lower portion.
Sizes 040 and 050: Circuit 1 uses the left condenser coil, Circuit 2 the right.
Size 060: Circuit A uses the two MCHX coils near the bulkhead, Circuit B
uses the two MCHX coils near the control box.
†Rollout switch is manual reset.
UNIT 48A2,A3,A4,A5 020D/E 025D/E 027D/E 030D/E
NOMINAL CAPACITY (tons) 20 25 27 30
BASE UNIT See Unit Weights Table
OPERATING WEIGHT (lb)
COMPRESSOR
Quantity ... Type (Ckt 1/Ckt 2) 2 ... ZP67/1…ZP91 2 ... ZP91/1…ZP91 2 ... ZP91/1…ZP91 2…ZP72, 2…ZP72
Number of Refrigerant Circuits 22 22
Oil Precharged Precharged Precharged Precharged
REFRIGERANT R-410A
Operating Charge (lb), Ckt 1/Ckt 2
RTPF Coils 26.2/18.8 30.2/15.2 32.8/16.5 30.5/34.3
MCHX Coils 14.9/11.8 20.4/12.8 20.4/12.8 15.1/15.3
MCHX CONDENSER*
Quantity 11 11
Total Face Area (sq ft) 32.9 32.9 32.9 32.9
RTPF CONDENSER
Quantity 11 11
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 19,500 19,500 19,500 19,500
Quantity... Diameter (in.) 2 ... 30 2 ... 30 2 ... 30 2 ... 30
Motor Hp 11 11
EVAPORATOR COIL Cross-Hatched Copper Tubes, Aluminum Plate Fins with Intertwined Circuits
Tube Size (in.)
3
/
8
3
/
8
3
/
8
3
/
8
Rows ... Fins/in. 3 ... 15 4 ... 14 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
AHRI/DOE Rated Cfm 6,000 6,250 6,750 8,250
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 4.8 4.4 5.7 5.2 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 9.0 9.1 8.7
Nominal Fan Shaft Diameter (in.) 1
15
/
16
1
15
/
16
1
15
/
16
1
15
/
16
Belt Quantity 122 1 1 2 2 22222
Belt Type BX56 BX50 5VX530 BX56 5VX570 5VX530 BX50 5VX500 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) 717 924 1096 773 962 1106 848 1059 1187 856 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) 0.1 0.1 0.1 0.1
Stage 2 (amps) 0.1 0.1 0.1 0.1
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) (%) 81 81 81 81
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 22 22
HIGH-PRESSURE SWITCH (psig)
Cutout 650 650 650 650
Reset (Auto.) 500 500 500 500
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
AHRI — Air Conditioning, Heating, and Refrigeration Institute
Cu — Copper
DOE — Department of Energy
MCHX— Microchannel Heat Exchanger
RTPF — Round Tube Plate Fin
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