551b ,c – Bryant 551C User Manual
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Table 2—Physical Data 551C
BASE UNIT 551C
024
036
048
060
NOMINAL CAPACITY (nominal tons)
2
3
4
5
OPERATING WEIGHT (lb)
Unit
435
445
465
635
Perfect Humidity™ Adaptive Dehumidification System
13
15
23
25
EconoMi$er IV
50
50
50
50
Roof Curb
115
115
115
115
COMPRESSOR
Scroll
Quantity
1
1
1
1
Oil (oz)
25
42
56
53
REFRIGERANT TYPE
R-22
Expansion Device
Acutrol™ Metering Device
Operating Charge (lb-oz)
Standard Unit
5---3
7---11
8---8
12---11
Unit With Perfect Humidity Adaptive Dehumidification System
10---2
14---0
14---13
21---0
CONDENSER FAN
Propeller
Quantity...Diameter (in.)
1...22
1...22
1...22
1...22
Nominal Cfm
3000
3500
3500
4100
Motor Hp...Rpm
1
/8...825
1
/8...825
1
/8...825
1
/
4
...1100
Watts Input (Total)
180
180
180
320
CONDENSER COIL
3/8---in. OD Enhanced Copper Tubes, Aluminum Lanced Fins
Rows...Fins/in.
1...17
1...17
2...17
2...17
Total Face Area (sq ft)
14.6
14.6
16.5
16.5
EVAPORATOR COIL
3/8---in. OD Enhanced Copper Tubes, Aluminum Double-Wavy Fins
Standard Unit
Rows...Fins/in.
2...15
2...15
2...15
4...15
Total Face Area (sq ft)
4.2
5.5
5.5
5.5
Unit with Perfect Humidity Adaptive Dehumidification System
Rows...Fins/in.
1...17
1...17
2...17
2...17
Total Face Area (sq ft)
3.5
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
800
1200
1600
2000
Maximum Continuous Bhp
Std
0.58
1.20
1.20
1.30/2.40*
Hi-Static
2.40
2.40
2.90
Motor Frame Size
Std
48
48
48
48/56*
Hi-Static
56
56
56
Motor Rpm
1620
1620
1620
1725
Fan Rpm Range
Std
400-1000
680-1044
770-1185
1035-1460
Hi-Static
1075-1455
1075-1455
1300-1685
Motor Bearing Type
Ball
Ball
Ball
Ball
Maximum Fan Rpm
1620
2100
2100
2100
Motor Pulley Pitch Diameter A/B (in.)
Std
2.4/3.2
1.9/2.9
1.9/2.0
2.4/3.4
Motor Pulley Pitch Diameter A/B (in.)
Hi-Static
2.8/3.8
2.8/3.8
3.4/4.4
Nominal Motor Shaft Diameter (in.)
Std
5
/
8
1/2
1
/
2
5
/
8
Hi-Static
7
/
8
5
/
8
5
/
8
5
/
8
Fan Pulley Pitch Diameter (in.)
Std
4.0
4.5
4.0
4.0
Hi-Static
4.5
4.5
4.0
4.5
Belt — Type...Length (in.)
Std
1...A...36
1...A...36
1...A...36
1....4...40
Hi-Static
1...A...39
1...A...39
1...A...40
Pulley Center Line Distance (in.)
10.0---12.4
10.0-12.4
10.0-12.4
14.7-15.5
Speed Change per Full Turn of
Std
60
65
70
75
Speed Change per Full Turn of
Movable Pulley Flange (rpm)
Hi-Static
65
65
60
Movable Pulley Maximum Full
Std
5
5
5
6
Movable Pulley Maximum Full
Turns from Closed Position
Hi-Static
6
6
5
Factory Setting — Full Turns Open
Std
3
3
3
3
Hi-Static
3
1
/
2
3
1
/
2
3
1
/
2
Factory Speed Setting (rpm)
Std
756
826
936
1248
Hi-Static
1233
1233
1396
Fan Shaft Diameter at Pulley (in.)
5
/
8
5
/
8
5
/
8
5
/
8
HIGH-PRESSURE SWITCH (psig)
Standard Compressor Internal Relief
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. Screen quantity and size varies with option selected.
RETURN-AIR FILTERS
Throwaway
Quantity...Size (in.)
2...16 x 25 x 2
LEGEND
Bhp — Brake Horsepower
*Single phase/three phase.
***These units do NOT meet the California low NOx requirements.
†††California SCAQMD compliant low NO
x
models have combustion products that are
controlled to 40 nanograms per joule or less.
551B
,C