Table 1 — physical data – Bryant DURAPAC PLUS 551B User Manual
Page 6
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6
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Table 1 — Physical Data
LEGEND
Bhp — Brake Horsepower
UNIT 551B
090
102
120
150
NOMINAL CAPACITY (tons)
7
1
/
2
8
1
/
2
10
12
1
/
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
2
2
2
2
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
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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
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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
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Nominal Motor Shaft Diameter (in.)
7
/
8
7
/
8
7
/
8
7
/
8
Fan Pulley Pitch Diameter (in.)
Standard
7.0
7.0
8.0
5.8
High Static
8.0
8.0
5.8
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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
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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
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Movable Pulley Maximum Full Turns
From Closed Position
Standard
5
5
5
6
High Static
5
5
6
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Factory Setting — Full Turns Open
5
5
5
5
Factory Speed Setting (rpm)
Standard
840
840
862
887
High Static
860
860
887
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Fan Shaft Diameter at Pulley (in.)
1
1
1
1
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
Cleanable. 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