Table 1 — physical data – Bryant Durapac Plus Series 551a User Manual
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6
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Table 1 — Physical Data
LEGEND
*Evaporator coil fin material/condenser coil fin material.
†Weight of 14-in. roof curb.
**Circuit 1 uses the lower portion of condenser coil and lower portion of evapora-
tor coils, and Circuit 2 uses the upper portion of both coils.
††Due to belt and pulley style, pulley cannot be set from 0 to 1
1
/
2
turns open.
UNIT 551A
155
180
240
NOMINAL CAPACITY (tons)
12
15
20
OPERATING WEIGHT (lb)
Unit
Al/Al*
1575
1650
1750
Al/Cu*
1725
1800
1900
Cu/Cu*
1855
1930
2030
EconoMi$er
80
80
80
Roof Curb†
200
200
200
Perfect Humidity™ Dehumidification Package
40
40
40
COMPRESSOR
Quantity...Model (Ckt 1, Ckt 2)
1...ZR72KC, 1...ZR57KC
1...ZR94KC, 1...ZR72KC
1...ZR125KC, 1...ZR108KC
Number of Refrigerant Circuits
2
2
2
Crankcase Heater Watts
70
70
70
Loading (% of Full Capacity)
0, 56, 100
0, 60, 100
0, 60, 100
Oil (oz) (Ckt 1, Ckt 2)
60, 66
85, 60
110, 110
REFRIGERANT TYPE
R-22
Expansion Device
TXV
Operating Charge (lb)**
Circuit 1
20.7
19.5
18.5
Circuit 2
11.9
13.45
13.3
CONDENSER COIL
Cross-Hatched
3
/
8
-in. Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated,
or Copper Plate Fins
Rows...Fins/in.
4...15
4...15
4...15
Total Face Area (sq ft)
21.7
21.7
21.7
CONDENSER FAN
Propeller Type
Nominal Cfm
10,500
10,500
14,200
Quantity...Diameter (in.)
3...22
3...22
2...30
Motor Hp...Rpm
1
/
2
...1050
1
/
2
...1050
1...1075
Watts Input (Total)
1100
1100
3400
EVAPORATOR COIL
Cross-Hatched
3
/
8
-in. Copper Tubes, Aluminum Lanced or Copper Plate Fins, Face Split
Rows...Fins/in.
4...15
4...15
4...15
Total Face Area (sq ft)
17.5
17.5
17.5
EVAPORATOR FAN
Centrifugal Type
Quantity...Size (in.)
2...10 x 10
2...12 x 12
2...12 x 12
Type Drive
Belt
Belt
Belt
Nominal Cfm
5200
6000
8000
Std Motor Hp
2.9
5
7.5
Opt Motor Hp
3.7
Motor Nominal Rpm
1725
1745
1745
Std Maximum Continuous Bhp
3.13
6.13
9.47 [208 v], 10.33 [230 v and 460 v]
Opt Maximum Continuous Bhp
4.38
N/A
N/A
Motor Frame Size
56H
184T
213T
Fan Rpm Range
Low-Medium Static
834-1064
873-1021
1002 -1151
High Static
1161-1426
1025-1200
1193-1369
Motor Bearing Type
Ball
Ball
Ball
Maximum Allowable Rpm
1,550
1,550
1,550
Motor Pulley Pitch Dia.
Low-Medium Static
3.1/4.1
4.9/5.9
5.4/6.6
High Static
3.7/4.7
4.9/5.9
5.4/6.6
Nominal Motor Shaft Diameter (in.)
7
/
8
1
1
/
8
1
3
/
8
Fan Pulley Pitch Diameter (in.)
Low-Medium Static
6.0
9.4
9.4
High Static
5.2
8.0
7.9
Nominal Fan Shaft Diameter (in.)
1
3
/
16
1
7
/
16
1
7
/
16
Belt, Quantity...Type...Length (in.)
Low-Medium Static
1...BX...42
1...BX...50
1...BX...54
High Static
1...BX...42
1...BX...48
1...BX...50
Pulley Center Line Distance (in.)
13.5-15.5
13.3-14.8
14.6-15.4
Speed Change per Full Turn of Movable
Low-Medium Static
58
37
37
Pulley Flange (Rpm)
High Static
67
44
44
Movable Pulley Maximum Full Turns
From Closed Position
4††
4††
4††
Factory Speed
3.5
3.5
3.5
Factory Speed Setting (Rpm)
Low-Medium Static
978
965
1095
High Static
1327
1134
1303
HIGH-PRESSURE SWITCH (psig)
Cutout
426
Reset (Auto.)
320
LOW-PRESSURE SWITCH (psig)
Cutout
27
Reset (Auto.)
44
FREEZE PROTECTION THERMOSTAT (F)
Opens
30 ± 5
Closes
45 ± 5
OUTDOOR-AIR INLET SCREENS
Cleanable
Quantity...Size (in.)
2...20 x 25 x 1
1...20 x 20 x 1
RETURN-AIR FILTERS
Throwaway
Quantity...Size (in.)
4...20 x 20 x 2
4...16 x 20 x 2
Al
— Aluminum
Bhp — Brake Horsepower
Cu
— Copper
TXV — Thermostatic Expansion Valve