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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
22
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
0TFQ004-012
551A155-180