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PHYSICAL DATA — 551B036-072
LEGEND
Bhp —
Brake Horsepower
*Single-phase/three-phase.
UNIT 551B 036 048 060 072
NOMINAL CAPACITY (tons)
3456
OPERATING WEIGHT (lb)
Unit
435 445 465 520
EconoMi$er
47 47 47 47
Perfect Humidity™ Dehumidification Package
18 18 18 18
Roof Curb
115 115 115 115
COMPRESSOR
Scroll
Quantity
1111
Oil (oz)
42 53 50 60
REFRIGERANT TYPE
R-22
Operating Charge (lb-oz)
Standard Unit
5- 8 8-6 10- 0 9-10
Unit With Perfect Humidity Dehumidification Package
8-13 11-2 12-13 13- 6
CONDENSER FAN
Propeller Type
Quantity...Diameter (in.)
1...22 1...22 1...22 1...22
Nominal Cfm
3500 3500 4100 4100
Motor Hp...Rpm
1
/
8
...825
1
/
8
...825
1
/
4
...1100
1
/
4
...1100
Watts Input (Total)
180 180 320 320
CONDENSER COIL
High-Efficiency Enhanced Copper Tubes, Lanced Aluminum Fins
Standard Unit
Rows...Fins/in.
1...17 2...17 2...17 2...17
Total Face Area (sq ft)
14.6 16.5 16.5 16.5
Unit With Perfect Humidity Dehumidification Package
Rows...Fins/in.
1...17 1...17 1...17 1...17
Total Face Area (sq ft)
3.9 3.9 3.9 3.9
EVAPORATOR FAN
Centrifugal Type, Belt Drive
Quantity...Size (in.)
1...10 x 10 1...10 x 10 1...10 x 10 1...10 x 10
Nominal Cfm
1200 1600 2000 2400
Maximum Continuous Bhp
Standard
1.20 1.20 1.30/2.40* 2.40
High Static
2.40 2.40 2.90 2.90
Motor Frame
Standard
48 48 56 56
High Static
56 56 56 56
Fan Rpm Range
Standard
760-1090 840-1185 1020-1460/1120-1585* 1120-1585
High Static
1075-1455 1075-1455 1300-1685 1300-1685
Motor Bearing Type
Ball Ball Ball Ball
Maximum Fan Rpm
2100 2100 2100 2100
Motor Pulley Pitch Diameter A/B (in.)
Standard
1.9/2.9 1.9/2.9 2.4/3.4 2.4/3.4
High Static
2.8/3.8 2.8/3.8 3.4/4.4 3.4/4.4
Nominal Motor Shaft Diameter (in.)
Standard
1
/
2
1
/
2
5
/
8
5
/
8
High Static
5
/
8
5
/
8
7
/
8
7
/
8
Fan Pulley Pitch Diameter (in.)
Standard
4.5 4.0 4.0 4.0
High Static
4.5 4.0 4.5 4.5
Belt — Quantity...Type...Length (in.)
Standard
1...A...33 1...A...36 1...A...40 1...A...38
High Static
1...A...39 1...A...39 1...A...40 1...A...40
Pulley Center Line Distance (in.)
10.0-12.4 10.0-12.4 14.7-15.5 14.7-15.5
Speed Change per Full Turn of
Movable Pulley Flange (rpm)
Standard
65 70 75 95
High Static
65 65 60 60
Movable Pulley Maximum Full Turns
From Closed Position
Standard
5565
High Static
6655
Factory Setting — Full Turns Open
Standard
3333
High Static
3
1
/
2
3
1
/
2
3
1
/
2
3
1
/
2
Factory Speed Setting (rpm)
Standard
890 980 1240 1304
High Static
1233 1233 1396 1396
Fan Shaft Diameter at Pulley (in.)
5
/
8
5
/
8
5
/
8
5
/
8
EVAPORATOR COIL
High Efficiency Enhanced Copper Tubes, Aluminum Double-Wavy Fins, Acutrol™ Metering Device
Rows...Fins/in.
2...15 2...15 4...15 4...15
Total Face Area (sq ft)
5.5 5.5 5.5 5.5
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
Closes (F)
45
OUTDOOR-AIR INLET SCREENS
Cleanable
Quantity...Size (in.)
1...20 x 24 x 1
RETURN-AIR FILTERS
Throwaway
Quantity...Size (in.)
2...16 x 25 x 2
0TFQ004-012
551B036-150