Bryant DURAPAC 551B User Manual
Page 151
151
PHYSICAL DATA — 551A155,180
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
NOMINAL CAPACITY (tons)
13
15
OPERATING WEIGHT (lb)
Unit
Al/Al*
1575
1650
Al/Cu*
1725
1800
Cu/Cu*
1855
1930
EconoMi$er
110
110
Roof Curb†
200
200
Perfect Humidity™ Dehumidification Package
40
40
COMPRESSOR
Quantity...Model (Ckt 1, Ckt 2)
1...ZR72KC, 1...ZR57KC
1...ZR94KC, 1...ZR72KC
Number of Refrigerant Circuits
2
2
Loading (% of full capacity)
0,56,100
0,60,100
Oil (oz) (Ckt 1, Ckt 2)
60, 66
85, 60
REFRIGERANT TYPE
R-22
Expansion Device
TXV
Operating Charge (lb)**
Circuit 1
20.7
19.5
Circuit 2
11.9
13.45
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
Total Face Area (sq ft)
21.7
21.7
CONDENSER FAN
Propeller Type
Nominal Cfm
10,500
10,500
Quantity...Diameter (in.)
322
3...22
Motor Hp...Rpm
1
/
2
...1050
1
/
2
...1050
Watts Input (Total)
1100
1100
EVAPORATOR COIL
Cross-Hatched
3
/
8
-in. Copper Tubes, Aluminum Lanced or Copper Plate Fins,
Face Split
Rows...Fins/in.
4...15
4...15
Total Face Area (sq ft)
17.5
17.5
EVAPORATOR FAN
Centrifugal Type
Quantity...Size (in.)
2...10 x 10
2...12 x 12
Type Drive
Belt
Belt
Nominal Cfm
5200
6000
Std Motor Hp
2.9
5
Opt Motor Hp
3.7
Motor Nominal Rpm
1725
1745
Std Maximum Continuous Bhp
3.13
6.13
Opt Maximum Continuous Bhp
4.38
N/A
Motor Frame Size
56H
184T
Fan Rpm Range
Low-Medium Static
834-1064
873-1021
High Static
1161-1426
1025-1200
Motor Bearing Type
Ball
Ball
Maximum Allowable Rpm
1,550
1,550
Motor Pulley Pitch Dia.
Low-Medium Static
3.1/4.1
4.9/5.9
High Static
3.7/4.7
4.9/5.9
Nominal Motor Shaft Diameter (in.)
7/
8
1
1
/
8
Fan Pulley Pitch Diameter (in.)
Low-Medium Static
6.0
9.4
High Static
5.2
8.0
Nominal Fan Shaft Diameter (in.)
1
3
/
16
1
7
/
16
Belt, Quantity...Type...Length (in.)
Low-Medium Static
1...BX...42
1...BX...50
High Static
1...BX...42
1...BX...48
Pulley Center Line Distance (in.)
13.5-15.5
13.3-14.8
Speed Change per Full Turn of Movable
Pulley Flange (Rpm)
Low-Medium Static
58
37
High Static
67
44
Movable Pulley Maximum Full Turns
From Closed Position
4††
4††
Factory Speed
3.5
3.5
Factory Speed Setting (Rpm)
Low-Medium Static
978
965
High Static
1327
1134
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
0
T
F
Q
0
04
-0
12
55
1A1
55-
18
0