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Table 1 — Physical Data
LEGEND
Bhp — Brake Horsepower
UNIT 551B 090 102 120 150
NOMINAL CAPACITY (tons) 71/281/210 121/2
OPERATING WEIGHT (lb)
Unit 755 895 915 930
EconoMi$er IV 75 75 75 75
Perfect Humidity™ Dehumidification Package 44 51 51 51
Roof Curb 143 143 143 143
COMPRESSOR Scroll
Quantity 2222
Oil (oz) (each compressor) 53 53 50 60
REFRIGERANT TYPE R-22
Expansion Device Metering Device
Operating Charge (lb-oz)
Standard Unit
Circuit 1 7-10 9- 8 9-6 9-8
Circuit 2 8-2 8-13 10-9 9-5
Unit With Perfect Humidity Dehumidification Package
Circuit 1 13-0 16-0 16-8 15-3
Circuit 2 13-6 16-8 17-8 16-6
CONDENSER FAN Propeller Type
Quantity...Diameter (in.) 2...22 2...22 2...22 2...22
Nominal Cfm 6500 6500 7000 7000
Motor Hp...Rpm 1/4...1100 1/4...1100 1/4...1100 1/4...1100
Watts Input (Total) 650 650 650 650
CONDENSER COIL High-Efficiency Enhanced Copper Tubes, Lanced Aluminum Fins
Rows...Fins/in. 2...17 2...17 2...17 2...17
Total Face Area (sq ft) 20.5 25.0 25.0 25.0
EVAPORATOR COIL High Efficiency Enhanced Copper Tubes, Aluminum Double-Wavy Fins, Face Split
Standard Unit
Rows...Fins/in. 3...15 4...15 4...15 4...15
Total Face Area (sq ft) 8.9 11.1 11.1 11.1
Unit with Perfect Humidity Dehumidification Package
Rows...Fins/in. 2...17 2...17 2...17 2...17
Total Face Area (sq ft) 6.3 8.4 8.4 8.4
EVAPORATOR FAN Centrifugal Type, Belt Drive
Size (in.) 15 x 15 15 x 15 15 x 15 15 x 15
Nominal Cfm — Standard 3000 3400 4000 5000
Maximum Continuous Bhp
Standard 2.90 2.90 3.70 5.25
High Static 4.20 4.20 5.25 —
Motor Frame 56 56 56 56
Fan Rpm Range
Standard 840-1085 840-1085 860-1080 830-1130
High Static 860-1080 860-1080 830-1130 —
Motor Bearing Type Ball Ball Ball Ball
Maximum Fan Rpm 2100 2100 2100 2100
Motor Pulley Pitch Diameter A/B (in.)
Standard 3.4/4.4 3.4/4.4 4.0/5.0 2.8/3.8
High Static 4.0/5.0 4.0/5.0 2.8/3.8 —
Nominal Motor Shaft Diameter (in.) 7/87/87/87/8
Fan Pulley Pitch Diameter (in.)
Standard 7.0 7.0 8.0 5.8
High Static 8.0 8.0 5.8 —
Belt — Quantity...Type...Length (in.)
Standard 1...A...48 1...A...51 1...A...51 1...BX...46
High Static 1...A...55 1...A...55 1...BX...46 —
Pulley Center Line Distance (in.) 16.75-19.25 16.75-19.25 15.85-17.50 15.85-17.50
Speed Change per Full Turn of
Movable Pulley Flange (rpm)
Standard 50 50 45 60
High Static 60 60 60 —
Movable Pulley Maximum Full Turns
From Closed Position
Standard 5556
High Static 556—
Factory Setting — Full Turns Open 5555
Factory Speed Setting (rpm)
Standard 840 840 862 887
High Static 860 860 887 —
Fan Shaft Diameter at Pulley (in.) 1111
HIGH-PRESSURE SWITCH (psig)
Standard Compressor Internal Relief (Differential) 450 ± 50
Cutout 428
Reset (Auto.) 320
LOSS-OF-CHARGE/LOW-PRESSURE
SWITCH (Liquid Line) (psig)
Cutout 7 ± 3
Reset (Auto.) 22 ± 5
FREEZE-PROTECTION THERMOSTAT
Opens (F) 30 ± 5
Closes (F) 45 ± 5
OUTDOOR-AIR INLET SCREENS Clea nable. Screen size and quantity varies by options selected.
RETURN-AIR FILTERS Throwaway
Quantity...Size (in.) 4...16 x 20 x 2 4...16 x 20 x 2 4...20 x 20 x 2 4...20 x 20 x 2