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Table 1B — Physical Data (48ZG,ZN055-070)
LEGEND
BASE UNIT 48ZG,ZN055 48ZG,ZN060 48ZG,ZN070
NOMINAL CAPACITY (tons) 55 60 70
OPERATING WEIGHT (lb) Standard Chassis Extended Chassis Standard Chassis Extended Chassis Standard Chassis
Base Unit
Low Heat 8700 9248 9000 9,548 9,420
High Heat 8820 9368 9120 9,668 9,550
With Economizer
Low Heat 9230 9730 9530 10,030 9,950
High Heat 9350 9850 9650 10,450 10,080
COMPRESSORS Semi-Hermetic
Quantity...Type 2...06E 2...06E 2...06E
Oil Charge (Pints) 19, 14 19 19
Capacity Steps (%)
CV 60,100 50,100 45,100
VAV 20,40,60,80,100 17,33,50,67,83,100 14,29,43,51,66,71,85,100
Number of Refrigerant Circuits 222
REFRIGERANT R-22
Operating Charge (lb), Ckt 1/Ckt 2
Standard Evaporator Coil 59.0/44.5 61.0/61.0 70.5/64.5
Standard Evaporator with HGBP 62.0/44.5 64.0/61.0 73.5/64.5
Alternate High-Capacity Evaporator Coil 72.0/58.0 69.5/69.5 82.5/74.5
Alternate High-Capacity Evaporator
with HGBP
75.0/58.0 72.5/69.5 85.5/74.5
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
Quantity 2
Total Face Area (sq ft) 61.5
Refrigerant Feed Device...No. per Circuit TXV...2
Standard Evaporator Coils
1
/
2
in. Tube Dia
Rows...Fins/in. 3...17.0 4...17.0 4...17.0
Fin Type Double Wavy Double Wavy Double Wavy
Tube Type Smooth Smooth Smooth
Alternate, High-Capacity Evaporator Coils
1
/
2
in. Tube Dia
Rows...Fins/in. 6...16 6...16 6...16
Fin Type Double Wavy Double Wavy Double Wavy
Tube Type Cross Hatched Cross Hatched Cross Hatched
HEATING SECTION Low Heat High Heat Low Heat High Heat Low Heat High Heat
Number of Heat Exchangers 232323
Input (MBtuh) 650 975 650 975 650 975
Output (MBtuh) 527 790 527 790 527 790
Temperature Rise Range (F) 10-40 20-50 10-40 20-50 10-40 20-50
Efficiency (%) 81 81 81 81 81 81
Burner Orifice Diameter
Quantity (in. ...drill no.) 14 (.1285...30) 21 (.1285...30) 14 (.1285...30) 21 (.1285...30) 14 (.1285...30) 21 (.1285...30)
Manifold Pressure (in. wg) 3.3 3.3 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 5.0...13.0 5.0...13.0
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
SUPPLY FAN Centrifugal 25 x 25 in.
Nominal Cfm 17,500 21,000 24,500
Maximum Allowable Cfm 25,000 30,000 30,000
Maximum Allowable Rpm 800 800 800
Shaft Diameter at Pulley (in.) 1
11
/
16
1
11
/
16
1
11
/
16
SUPPLY-FAN MOTOR AND DRIVE (Any motor available on any unit)
Motor Hp 15 20 25 30 40
Motor Frame Size 254T 256T 284T 286T S324T
Efficiency at Full Load (%)
High Efficiency 91.0 91.0 91.7 92.4 93.0
Premium Efficiency 93.0 93.6 93.6 93.6 94.5
Fan Pulley Pitch Diameter (in.) 13.7 13.7 13.7 15.5 16.1
Motor Pulley Pitch Diameter (in.) 4.5 5.1 5.5 5.9 6.7
Resulting Fan Speed (rpm) 575 651 703 711 740
Belts Quantity...Type 2...5VX1230 2...5VX1230 2...5VX1230 2...5VX1230 3...5VX1250
Center Distance Range (in.) 48.25-44.00 48.25-44.00 48.50-44.25 48.50-44.25 48.25-44.00
OPTIONAL POWER EXHAUST Centrifugal, 15 x 15 in. (Any motor available on any unit)
Quantity...Motor Hp 2...5 2...7.5 2...10
Motor Frame Size 184T 213T 215T
Efficiency at Full Load (%) High/Premium 87.5/89.5 88.5/91.7 89.5/91.7
Resulting Fan Rpm 740 820 920
Maximum Allowable Rpm 1000 1000 1000
FILTERS
Standard Efficiency Throwaway (Standard) 12...20 x 25 x 2 12...20 x 25 x 2 12...20 x 25 x 2
Quantity...Size (in.) 12...20 x 20 x 2 12...20 x 20 x 2 12...20 x 20 x 2
Medium Efficiency (30%) Pleated (Optional) 12...20 x 25 x 2 12...20 x 25 x 2 12...20 x 25 x 2
Quantity...Size (in.) 12...20 x 20 x 2 12...20 x 20 x 2 12...20 x 20 x 2
High Efficiency (90%) Bag Filters
with High Velocity Prefilters (Optional)
Quantity...Size (in.)
Bag Filter
6...24 x 24 x 22
6...24 x 20 x 22
6...24 x 24 x 22
6...24 x 20 x 22
6...24 x 24 x 22
6...24 x 20 x 22
Prefilter
6...24 x 24 x 2
6...20 x 24 x 2
6...24 x 24 x 2
6...20 x 24 x 2
6...24 x 24 x 2
6...20 x 24 x 2
OUTSIDE AIR SCREENS
Standard Hood (25%) Quantity...Size (in.)
4...25 x 16 x 1
2...20 x 16 x 1
4...25 x 16 x 1
2...20 x 16 x 1
4...25 x 16 x 1
2...20 x 16 x 1
OPTIONAL ECONOMIZER FILTER Aluminum Frame, Permanent
Quantity...Size (in.)
12...16 x 25 x 1
2...16 x 20 x 1
12...16 x 25 x 1
2...16 x 20 x 1
12...16 x 25 x 1
2...16 x 20 x 1
CV — Constant Volume
HGBP — Hot Gas Bypass
MBtuh — Btuh in Thousands
TXV — Thermostatic Expansion Valve
VAV — Variable Air Volume