33
While scroll compressors usually do not require
crankcase heaters, there are instances when a
heater should be added� Refrigerant migration
during the off cycle can result in a noisy start up�
Add a crankcase heater to minimize refrigerant
migration and to help eliminate any start up noise
or bearing “wash out.”
NOTE: A crankcase heater should be installed if:
• The system charge exceeds the values listed in
the adjacent tables,
• The system is subject to low voltage variations,
or
• When a low ambient control is used for system
operation below 55°F�
All heaters are located on the lower half of the
compressor shell� Its purpose is to drive refrigerant
from the compressor shell during long off cycles,
thus preventing damage to the compressor during
start-up�
At initial start-up or after extended shutdown
periods, make sure the heater is energized for at
least 12 hours before the compressor is started�
(Disconnect switch is on and wall thermostat is off�)
Compressor Crankcase Heat (CCH)
High- and Low-Pressure Controls (HPC and LPC)
HPC and LPC are not installed on RA13**AJINA,
but can be field installed using the followiing
kit numbers: RXAB-A0z (high pressure control)
and RXAC-A0Z (low pressure control)� These
controls keep the compressor from operating in
pressure ranges which can cause damage to the
compressor� Both controls are in the low-voltage
control circuit�
The high-pressure control (HPC) is an automatic-
reset which opens near 610 PSIG and closes near
420 PSIG�
The low-pressure control (LPC) is an automatic-
reset which opens near 15 PSIG and closes near
40 PSIG�
CAUTION: The compressor has
an internal overload protector� Under some
conditions, it can take up to 2 hours for this
overload to reset� Make sure overload has had
time to reset before condemning the compressor�
COMPONENTS AND CONTROLS
Components
MAXIMUM SYSTEM CHARGE VALUES
RA13
Model
Size
Compressor
Model Number
18AJ
24AJ
30AJ
36AJ
42AJ
48AJ
60AJ
36AC
42AC
48AC
60AC
36AD
42AD
48AD
60AD
48AY
60AY
ZP14KAE/ZP14K6E
ZP20KAE
ZP24K5E
ZP31K6E
ZP34K5E
ZP42K5E
ZP51K5E
ZP31K6E-TF5
ZP34K5E-TF5
ZP42K5E-TF5
ZP51K5E-TF5
ZP31K6E-TFD
ZP34K5E-TFD
ZP42K5E-TFD
ZP51K5E-TFD
ZP42K5E-TFE
ZP51K5E-TFE
9.6 lbs.
9.6 lbs.
9.6 lbs.
9.6 lbs.
12 lbs.
12 lbs.
12 lbs.
9.6 lbs.
12 lbs.
12 lbs.
12 lbs.
9.6 lbs.
12 lbs.
12 lbs.
12 lbs.
12 lbs.
12 lbs.
Charge Limit
Without Crankcase
Heat (1 Phase)
MAXIMUM SYSTEM CHARGE VALUES
Charge Limit
Without Crankcase
Heat (1 Phase)
RA16
Model
Size
Compressor
Model Number
18AJ
24AJ
30AJ
36AJ
42AJ
48AJ
60AJ
60BJ
36AC
42AC
48AC
60AC
ZP14K6E
ZP21K6E
ZP24K6E
ZP31K6E
ZP34K6E
ZP38K6E
ZP49K6E
ZP49K6E
ZP31K6E-TF5
ZP34K6E-TF5
ZP38K6E-TF5
ZP49K6E-TF5
9.6 lbs.
9.6 lbs.
9.6 lbs.
9.6 lbs.
12 lbs.
12 lbs.
12 lbs.
12 lbs.
12 lbs.
12 lbs.
12 lbs.
12 lbs.
MAXIMUM SYSTEM CHARGE VALUES
Charge Limit
Without Crankcase
Heat (1 Phase)
RA14
Model
Size
Compressor
Model Number
18AJ
24AJ
30AJ
36AJ
42AJ
48AJ
60AJ
36AC
42AC
48AC
60AC
36AD
42AD
48AD
60AD
ZP14KAE/ZP14K6E
ZP20KAE
ZP24K5E
ZP29K5E
ZP34K5E
ZP39K5E
ZP49K6E
ZP31K6E-TF5
ZP34K5E-TF5
ZP42K5E-TF5
ZP51K5E-TF5
ZP31K6E-TFD
ZP34K5E-TFD
ZP42K5E-TFD
ZP51K5E-TFD
9.6 lbs.
9.6 lbs.
9.6 lbs.
9.6 lbs.
12 lbs.
12 lbs.
12 lbs.
9.6 lbs.
12 lbs.
12 lbs.
12 lbs.
9.6 lbs.
12 lbs.
12 lbs.
12 lbs.
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