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Table 1A — Physical Data (48ZG,ZN030-050) (cont)
LEGEND
*460-3-60 only
.
BASE UNIT 48ZG,ZN040 48ZG,ZN050
NOMINAL CAPACITY (tons) 40 50
OPERATING WEIGHT (lb) Standard Chassis Extended Chassis Standard Chassis Extended Chassis
Base Unit
Low Heat 6540 7040 6581 7081
High Heat 6670 7170 6710 7210
With Economizer
Low Heat 6841 7341 6881 7381
High Heat 6970 7470 7010 7510
COMPRESSORS Semi-Hermetic
Quantity...Type 2...06E 2...06E
Oil Charge (pints) 14 19, 14
Capacity Steps (%)
CV 50,100 57,100
VAV 25,50,75,100 18,37,56,63,81,100
Number of Refrigerant Circuits 22
REFRIGERANT R-22
Operating Charge (lb), Ckt 1/Ckt 2
Standard Evaporator Coil 40.0/40.0 41.5/39.0
Standard Evaporator with HGBP 42.0/40.0 43.5/39.0
Alternate High-Capacity Evaporator Coil 50.0/51.0 49.0/49.0
Alternate High-Capacity Evaporator with HGBP 52.0/51.0 51.0/49.0
CONDENSER COILS
3
/
8
-in. Tube Diameter
Quantity 22
Rows...Fins/in.
Aluminum 3...15.0 3...15.0
Copper (Optional) 3...13.7 3...13.7
Total Face Area (sq ft) 50.0 50.0
EVAPORATOR COILS
Quantity 2
Total Face Area (sq ft) 45.5
Refrigerant Feed Device...No. per Circuit TXV...2
Standard Evaporator Coils
1
/
2
in. Tube Dia
1
/
2
in. Tube Dia
Rows...Fins/in. 3...15.0 4...15.0
Fin Type Double Wavy Double Wavy
Tube Type Cross Hatched Cross Hatched
Alternate, High-Capacity Evaporator Coils
1
/
2
in. Tube Dia
1
/
2
in. Tube Dia
Rows...Fins/in. 6...16.0 6...16.0
Fin Type Double Wavy Double Wavy
Tube Type Cross Hatched Cross Hatched
HEATING SECTION Low Heat High Heat Low Heat High Heat
Number of Heat Exchangers 1212
Input (MBtuh) 325 650 325 650
Output (MBtuh) 263 527 263 527
Temperature Rise Range (F) 10-40 25-55 10-40 25-55
Efficiency (%) 81 81 81 81
Burner Orifice Diameter
Quantity (in. ...drill no.) 7 (.1285...30) 14 (.1285...30) 7 (.1285...30) 14 (.1285...30)
Manifold Pressure (in. wg) 3.3 3.3 3.3 3.3
Line Pressure (in. wg) (min...max) 5.0...13.0 5.0...13.0 5.0...13.0 5.0...13.0
Firing Stages 2222
Number of Gas Valves 1212
CONDENSER FANS Propeller Type
Quantity...Diameter (in.) 3...30 3...30
Nominal Cfm 26,000 26,000
Motor Hp...Rpm 1.0...1140 1.0...1140
SUPPLY FAN Centrifugal 25 x 25 in.
Nominal Cfm 14,000 14,000
Maximum Allowable Cfm 20,000 20,000
Maximum Allowable Rpm 900 900
Shaft Diameter at Pulley (in.) 1
11
/
16
1
11
/
16
SUPPLY-FAN MOTOR AND DRIVE (Any motor available on any unit)
Motor Hp 7.51015202530*
Motor Frame Size 213T 215T 254T 256T 284T 286T
Efficiency at Full Load (%)
High Efficiency 88.5 89.5 91.0 91.0 91.7 92.4
Premium Efficiency 91.7 91.7 93.0 93.6 93.6 93.6
Fan Pulley Pitch Diameter (in.) 13.7 13.7 13.7 13.7 13.7 12.5
Motor Pulley Pitch Diameter (in.) 3.4 4.3 4.9 5.5 6.5 6.5
Resulting Fan Speed (rpm) 438 549 626 703 830 910
Belts Quantity...Type 2...BX60 2...5VX630 2...5VX630 2...5VX630 2...5VX650 3...5VX630
Center Distance Range (in.) 17.74-14.30 17.74-14.30 17.63-14.01 17.63-14.01 16.63-12.87 16.63-12.87
OPTIONAL POWER EXHAUST Centrifugal, 18 x 15 in. (Any motor available on any unit)
Quantity...Motor Hp 2...3.0 2...5.0 2...7.5 2...10
Motor Frame Size High Eff 56HZ 184T 213T 215T
Prem Eff 182T 184T 213T 215T
Efficiency at Full Load (%) High/Premium 81.0/88.5 87.5/89.5 88.5/91.7 89.5/91.7
Fan Pulley Pitch Diameter (in.) High Eff 11 10.4 12 12
Prem Eff 11.0 10.4 12 12
Motor Pulley Pitch Diameter Range (in.) High Eff 4.1-3.1 4.7-3.7 6.0-4.8 7.0-5.8
Prem Eff 4.1-3.1 4.7-3.7 6.0-4.8 7.0-5.8
Motor Pulley Pitch Diameter Factory Setup (in.) 4.1 4.2 5.4 6.4
Blower Shaft Diameter at Pulley (in.) 1
7
/
16
1
7
/
16
1
7
/
16
1
7
/
16
Fan Rpm Range 500-656 621-785 717-882 854-1000
Factory Setup Fan Rpm 656 703 800 927
Maximum Allowable Rpm 1000 1000 1000 1000
Belts Quantity...No. High Eff 1...BX71 1...BX71 1...BX77 1...BX79
Prem Eff 1...BX71 1...BX71 1...BX77 1...BX79
Center Distance Range (in.) 23.62-26.50 23.62-26.50 23.62-26.50 23.62-26.50
FILTERS
Standard Efficiency Throwaway (Standard) 8...20 x 25 x 2 8...20 x 25 x 2
Quantity...Size (in.) 8...20 x 20 x 2 8...20 x 20 x 2
Medium Efficiency (30%) Pleated (Optional) 8...20 x 25 x 2 8...20 x 25 x 2
Quantity...Size (in.) 8...20 x 20 x 2 8...20 x 20 x 2
High Efficiency (90%) Bag Filters
with High Velocity Prefilters (Optional)
Quantity...Size (in.)
Bag Filter
6...20 x 24 x 22
6...20 x 20 x 22
6...20 x 24 x 22
6...20 x 20 x 22
Prefilter
12...16 x 20 x 2
3...20 x 24 x 2
12...16 x 20 x 2
3...20 x 24 x 2
OUTSIDE AIR SCREENS
Standard Hood (25%) Quantity...Size (in.) None None
OPTIONAL ECONOMIZER FILTER Aluminum Frame, Permanent
Quantity...Size (in.)
5...20 x 20 x 2
2...20 x 25 x 1
5...20 x 20 x 1
2...20 x 25 x 1
CV — Constant Volume
HGBP — Hot Gas Bypass
MBtuh — Btuh in Thousands
TXV — Thermostatic Expansion Valve
VAV — Variable Air Volume