Table 1 — Physical Data
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 |
|
|
|
|
| |||
Expansion Device |
|
|
|
| TXV |
| ||
Operating Charge (lb)** |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
Circuit 1 |
| 20.7 |
|
| 19.5 |
|
| 18.5 |
Circuit 2 |
| 11.9 |
|
| 13.45 |
|
| 13.3 |
CONDENSER COIL |
| |||||||
|
|
| 8 |
|
|
| ||
Rows...Fins/in. |
|
|
|
| or Copper Plate Fins |
| ||
| 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 |
| |||||||
Rows...Fins/in. |
| 8 |
|
|
|
|
|
|
| 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 |
|
|
|
| 1002 | |||
Motor Bearing Type | High Static |
|
|
|
| |||
| Ball |
|
| Ball |
|
| Ball | |
Maximum Allowable Rpm |
| 1,550 |
|
| 1,550 |
|
| 1,550 |
Motor Pulley Pitch Dia. | 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 |
|
| 11/8 |
|
| 13/8 | |
Fan Pulley Pitch Diameter (in.) | 6.0 |
|
| 9.4 |
|
| 9.4 | |
| High Static | 5.2 |
|
| 8.0 |
|
| 7.9 |
Nominal Fan Shaft Diameter (in.) | 13/16 |
|
| 17/16 |
|
| 17/16 | |
Belt, Quantity...Type...Length (in.) | 1...BX...42 |
|
| 1...BX...50 |
|
| 1...BX...54 | |
Pulley Center Line Distance (in.) | High Static | 1...BX...42 |
|
| 1...BX...48 |
|
| 1...BX...50 |
|
|
|
|
| ||||
Speed Change per Full Turn of Movable | 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) | 978 |
|
| 965 |
|
| 1095 | |
| High Static | 1327 |
|
| 1134 |
|
| 1303 |
|
|
|
|
|
|
|
| |
Cutout |
|
| 426 |
|
|
| ||
Reset (Auto.) |
|
| 320 |
|
|
| ||
|
|
|
|
|
|
|
| |
Cutout |
|
| 27 |
|
|
| ||
Reset (Auto.) |
|
| 44 |
|
|
| ||
FREEZE PROTECTION THERMOSTAT (F) |
|
|
|
|
|
|
|
|
Opens |
|
| 30 ± 5 |
|
|
| ||
Closes |
|
| 45 ± 5 |
|
|
| ||
|
|
|
| Cleanable |
| |||
Quantity...Size (in.) |
|
|
|
| 2...20 x 25 x 1 |
| ||
|
|
|
| 1...20 x 20 x 1 |
| |||
|
|
|
|
|
| |||
|
|
|
|
| Throwaway |
| ||
Quantity...Size (in.) |
|
|
|
| 4...20 x 20 x 2 |
| ||
|
|
|
| 4...16 x 20 x 2 |
| |||
|
|
|
|
|
|
LEGEND
Al — Aluminum
Bhp — Brake Horsepower
Cu — Copper
TXV — Thermostatic Expansion Valve
*Evaporator coil fin material/condenser coil fin material. †Weight of
**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 11/2 turns open.