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Table 1B — Physical Data; 054-074 Units
BASE UNIT* 054 064 074
NOMINAL CAPACITY (tons) 50 60 75
OPERATING WEIGHT (lb)
Base Unit
48 Series, Low Heat 8700 9000 9420
48 Series, High Heat 8820 9120 9550
50 Series, Horizontal Discharge 8250 8550 8970
50 Series, Vertical Discharge 7700 8000 8430
With Economizer
48 Series, Low Heat 9230 9530 9950
48 Series, High Heat 9350 9650 10,080
50 Series, Horizontal Discharge 8780 9080 9500
50 Series, Vertical Discharge 8230 8530 8960
COMPRESSORS Semi-Hermetic
Quantity...Type 2...06E 2...06E 2...06E
Capacity Steps (%) 20, 40, 60, 80, 100 17, 33, 50, 66, 83, 100 14, 28, 43, 71, 85, 100
Number of Refrigerant Circuits 222
REFRIGERANT
Operating Charge (lb), Sys 1/Sys 2
Without Hot Gas Bypass 59.0/44.5 61.0/61.0 70.5/64.5
With Hot Gas Bypass 62.0/44.5 64.0/61.0 73.5/64.5
CONDENSER COILS
3
⁄
8
-in. Tube Diameter
Quantity 444
Rows...Fins/in.
Aluminum 2...17.0, 3...17.0 3...17.0 3...17.0
Copper (Optional) 2...15.7, 3...15.7 3...15.7 3...15.7
Total Face Area (sq ft) 72.4 72.4 108.4
EVAPORATOR COILS
1
⁄
2
-in. Tube Diameter
Quantity 222
Rows...Fins/in. 3...17.0 4...17.0 4...17.0
Total Face Area (sq ft) 61.5 61.5 61.5
Refrigerant Feed Device...
No. per Circuit
TXV...2 TXV...2 TXV..2
HEATING SECTION (48 Series Units Only) Low Heat High Heat Low Heat High Heat Low Heat High Heat
Number of Heat Exchangers 12 18 12 18 12 18
Input (MBtuh) 540 810 540 810 540 810
Output (MBtuh) 432 648 432 648 432 648
Temperature Rise Range (F) 5-35 15-45 5-35 15-45 5-35 15-45
Efficiency (%) 80 80 80 80 80 80
Burner Orifice Diameter
Quantity (in. ...drill no.) 12 (.1285...30) 18 (.1285...30) 12 (.1285...30) 18 (.1285...30) 12 (.1285...30) 18 (.1285...30)
Pilot Orifice Diameter
Quantity (in. ...drill no.) 2 (.076...48) 3 (.076...48) 2 (.076...48) 3 (.076...48) 2 (.076...48) 3 (.076...48)
Firing Stages 222222
Number of Gas Valves 232323
CONDENSER FANS Propeller Type
Quantity...Diameter (in.) 4...30 4...30 5...30
Nominal Cfm 40,000 40,000 50,000
Motor Hp...Rpm 1.0...1140 1.0...1140 1.0...1140
EVAPORATOR FAN Centrifugal 30 x 27 in.
Nominal Cfm 17,500 21,000 24,500
Maximum Allowable Cfm 25,000 30,000 30,000
Maximum Allowable Rpm 750 750 750
Shaft Diameter at Pulley (in.) 1
11
⁄
16
1
11
⁄
16
1
11
⁄
16
EVAPORATOR-FAN MOTOR AND DRIVE (Any motor available on any unit)
Motor Hp 15.0 20.0 25.0 30.0
Motor Frame Size 254T 256T 284T 286T
Efficiency at Full Load (%)
Standard Efficiency 84.5 87.5 87.1 88.3
High Efficiency† 90.0 91.0 91.7 92.4
Fan Pulley Pitch Diameter (in.) 13.7 13.7 13.7 15.5
Motor Pulley Pitch Diameter (in.) 4.5 5.1 5.5 5.9
Resulting Fan Rpm 555 625 660 700
Belts Quantity...Model No.
48 Series and 50 Series, Horizontal Discharge 2...5VX1120 2...5VX1150 2...5VX1150 2...5VX1180
50 Series, Vertical Discharge 2...5VX1230 2...5VX1230 2...5VX1230 2...5VX1230
Center Distance Range (in.)
48 Series and 50 Series, Horizontal Discharge 48.25...44.00 48.25...44.00 48.50...44.25 48.50...44.25
50 Series, Vertical Discharge 44.25...39.75 44.25...39.75 44.00...40.00 44.00...40.00
OPTIONAL POWER EXHAUST Centrifugal, 18 x 15 in. (Any motor available on any unit)
Quantity...Motor Hp 2...5.0 2...7.5 2...10.0
Motor Frame Size 184T 213T 215T
Efficiency at Full Load (%) 84.0 82.9 85.6
Fan Pulley Pitch Diameter (in.) 10.6 10.6 10.6
Motor Pulley Pitch Diameter (in.) 4.5 5.0 5.6
Shaft Diameter at Pulley (in.) 1
7
⁄
16
1
7
⁄
16
1
7
⁄
16
Resulting Fan Rpm 740 820 920
Maximum Allowable Rpm 925 925 925
FILTERS
Standard Efficiency
Throwaway (Standard) 15...20 x 25 x 2 15...20 x 25 x 2 15...20 x 25 x 2
Quantity...Size (in.) 5...16 x 20 x 2 5...16 x 20 x 2 5...16 x 20 x 2
Medium Efficiency (30%) Pleated (Optional) 15...20 x 25 x 2 15...20 x 25 x 2 15...20 x 25 x 2
Quantity...Size (in.) 5...16 x 20 x 2 5...16 x 20 x 2 5...16 x 20 x 2
High Efficiency (90%) Bag Filters
with Prefilters (Optional) 6...20 x 24 x 22 6...20 x 24 x 22 6...20 x 24 x 22
Quantity...Size (in.) 6...24 x 24 x 22 6...24 x 24 x 22 6...24 x 24 x 22
TXV — Thermostatic Expansion Valve
*Data is for all 48 and 50 Series units of the size listed unless otherwise specified.
†Not available on 575-v units.
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