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BASE UNIT 551B
NOMINAL CAPACITY (nominal tons)
OPERATING WEIGHT (lb)
Unit
Perfect Humidity™ Adaptive Dehumidification System
EconoMi$er IV
Roof Curb
COMPRESSOR
Quantity
Oil (oz)
REFRIGERANT TYPE
Expansion Device
Operating Charge (lb-oz)
Standard Unit
Unit With Perfect Humidity Adaptive Dehumidification System
CONDENSER FAN
Quantity...Diameter (in.)
Nominal Cfm
Motor Hp...Rpm
Watts Input (Total)
CONDENSER COIL
Rows...Fins/in.
Total Face Area (sq ft)
EVAPORATOR COIL
Standard Unit
Rows...Fins/in.
Total Face Area (sq ft)
Unit with Perfect Humidity Adaptive Dehumidification System
Rows...Fins/in.
Total Face Area (sq ft)
EVAPORATOR FAN
Quantity...Size (in.)
Nominal Cfm
Maximum Continuous Bhp
Motor Frame Size
Fan Rpm Range
Motor Bearing Type
Maximum Fan Rpm
Motor Pulley Pitch Diameter A/B (in.)
Motor Pulley Pitch Diameter A/B (in.)
Nominal Motor Shaft Diameter (in.)
Fan Pulley Pitch Diameter (in.)
Belt — Type...Length (in.)
Pulley Center Line Distance (in.)
Speed Change per Full Turn of
Speed Change per Full Turn of
Movable Pulley Flange (rpm)
Movable Pulley Maximum Full
Movable Pulley Maximum Full
Turns from Closed Position
Factory Setting — Full Turns Open
Factory Speed Setting (rpm)
Fan Shaft Diameter at Pulley (in.)
HIGH-PRESSURE SWITCH (psig)
Standard Compressor Internal Relief
Cutout
Reset (Auto.)
LOSS-OF-CHARGE/LOW-PRESSURE
SWITCH (Liquid LIne) (psig)
Cutout
Reset (Auto.)
FREEZE PROTECTION THERMOSTAT
Opens (F)
Closes (F)
OUTDOOR-AIR INLET SCREENS
RETURN-AIR FILTERS
Quantity...Size (in.)
LEGEND
Bhp — Brake Horsepower
*Single phase/three phase.
Table 1—Physical Data 551B
036
3
435
15
50
115
1
42
5-8
12-5
1...22
3500
1
/8...825
180
3/8 ---in. OD Enhanced Copper Tubes, Aluminum Lanced Fins
1...17
14.6
3/8 ---in. OD Enhanced Copper Tubes, Aluminum Double-Wavy Fins
2...15
5.5
1...17
3.9
1...10 x 10
1200
Std
1.20
Hi-Static
2.40
Std
48
Hi-Static
56
Std
680-1044
Hi-Static
1075-1455
Ball
2100
Std
1.9/2.9
Hi-Static
2.8/3.8
Std
1/
2
Hi-Static
5
/
8
Std
4.5
Hi-Static
4.5
Std
1...A...36
Hi-Static
1...A...39
10.0-12.4
Std
65
Hi-Static
65
Std
5
Hi-Static
6
Std
3
Hi-Static
1
3
/
2
Std
826
Hi-Static
1233
5
/
8
Cleanable. Screen quantity and size varies with option selected.
9
048
060
4
5
445
465
23
25
50
50
115
115
Scroll
1
1
53
50
R-22
Acutrol™ Metering Device
10-2
10-0
18-8
20-5
Propeller
1...22
1...22
3500
4100
1
1
/8...825
/
...1100
4
180
320
2...17
2...17
16.5
16.5
2...15
4...15
5.5
5.5
2...17
2...17
3.9
3.9
Centrifugal Type, Belt Drive
1...10 x 10
1...10 x 10
1600
2000
1.20
1.30/2.40*
2.40
2.90
48
56
56
56
770-1185
1035-1460/1035 ---1460*
1075-1455
1300-1685
Ball
Ball
2100
2100
1.9/2.9
2.4/3.4
2.8/3.8
3.4/4.4
1
5
/
/
2
8
5
/
/
7
8
8
4.0
4.0
4.5
4.5
1...A...36
1....4...40
1...A...39
1...A...40
10.0-12.4
14.7-15.5
70
75
65
60
5
6
6
5
3
3
1
1
3
/
3
/
2
2
936
1248
1233
1396
5
5
/
/
8
8
450 ± 50
428
320
7 ± 3
22 ± 5
30
45
Throwaway
2...16 x 25 x 2
072
6
540
29
50
115
1
60
12- 8
23-14
1...22
4100
1
/
...1100
4
320
2...17
21.3
4...15
7.3
2...17
5.2
1...10 x 10
2400
2.40
2.90
56
56
1120-1585
1300-1685
Ball
2100
2.4/3.4
3.4/3.4
5
/
8
7
/
8
3.7
4.5
1...A...38
1...A...40
14.7-15.5
95
60
5
5
3
1
3
/
2
1304
1396
5
/
8
2...16 x 16 x 2
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