Table 1b — Specifications (English)
UNIT 548C 090 120
NOMINAL CAPACITY (tons) 6.6 8.2
OPERATING WEIGHT (lb)
Unit 840 940
With Economizer 884 984
ROOF CURB WEIGHT (lb)
14-in. Curb 115 115
24-in. Curb 148 148
COMPRESSOR Hermetic
Quantity 22
Oil (oz) (each compressor) 55 70
REFRIGERANT R-22
Operating Charge (lb-oz)
Circuit 1 8-2 8-14
Circuit 2 7-0 8-10
OUTDOOR FAN Propeller Type
Quantity...Diameter (in.) 1...26 1...26
Nominal Cfm 6100 6900
Motor Hp...Rpm
1
⁄
3
...960
1
⁄
3
...960
OUTDOOR COIL Enhanced Copper Tubes, Aluminum Double-Wavy Fins
Rows...Fins/in. 2...17 2...17
Total Face Area (sq ft) 20.5 25.0
INDOOR FAN Centrifugal
Size (in.) 15x15 15x15
Type Drive Belt Belt
Nominal Cfm 2600 3400
Motor Hp 1.5 2.0
Motor Frame 56 56
Fan Rpm Range 622-881 692-896
Maximum Fan Rpm 1600 1600
Motor Pulley Pitch Diameter
2.4/3.4 3.4/4.4
Open/Closed (in.)
Fan Pulley Pitch Diameter (in.) 5.5 7.0
Belt — Type...Length (in.) A...48 A...51
Pulley Center Line Distance (in.) 16.75-19.25 18.25-20.75
Speed Change Per Full Turn of
52 41
Movable Pulley Flange (rpm)
Movable Pulley Maximum Full
55
Turns from Closed Position
Factory Setting — Full Turns Open 55
Factory Speed Setting (rpm) 622 692
Fan Shaft Diameter at Pulley (in.) 11
INDOOR COIL Enhanced Copper Tubes, Aluminum Double-Wavy Fins
Rows...Fins/in. 3...15 3...15
Total Face Area (sq ft) 8.0 10.0
OUTDOOR-AIR INLET SCREENS Cleanable
Quantity...Size (in.) 1...20 x 25 x 1
1...16 x 25 x 1
RETURN-AIR FILTERS Disposable
Quantity...Size (in.) 4...16 x 20 x 2 4...20 x 20 x 2
—7—
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