5300477-UIM-A-0317
Johnson Controls Unitary Products
9
COMPRESSORS
The compressor used in this product is specifically designed to operate
with R-410A refrigerant and cannot be interchanged. Compressors
used in PCE6 models contain two internal bypass ports which enable
the compressor to operate at 67% part load capacity.
Check compressor rotation. If the scroll is misshaped, change the
incoming line connection phasing to obtain the proper rotation.
The compressor uses polyolester (POE oil), Mobile 3MA POE. This oil
is extremely hygroscopic, meaning it absorbs water readily. POE oil can
absorb 15 times as much water as other oils designed for HCFC and
CFC refrigerants. If refrigerant circuit is opened, take all necessary pre-
cautions to avoid exposure of the oil to the atmosphere.
POE (polyolester) compressor lubricants are known to cause long term
damage to some synthetic roofing materials.
Procedures which risk oil leakage include, but are not limited to, com-
pressor replacement, repairing refrigerant leaks, replacing refrigerant
components such as filter drier, pressure switch, metering device or
coil.
Units are shipped with compressor mountings which are factory-
adjusted and ready for operation.
CAUTION
This system uses R-410A refrigerant which operates at higher pres-
sures than R-22. No other refrigerant may be used in this system.
CAUTION
Scroll compressors require proper rotation to operate properly. Fail-
ure to check and correct rotation may result in property damage.
NOTICE
Three-phase, scroll compressors operate in only one direction. If the
scroll is drawing low amperage, has similar suction and discharge
pressures, or is producing a high noise level, the scroll is misshaped.
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CAUTION
Do not leave the system open to the atmosphere. Unit damage could
occur due to moisture being absorbed by the POE oil in the system.
This type of oil is highly susceptible to moisture absorption
CAUTION
Exposure, even if immediately cleaned up, may cause embrittlement
(leading to cracking) to occur in one year or more. When performing
any service that may risk exposure of compressor oil to the roof, take
precautions to protect roofing.
CAUTION
Do not loosen compressor mounting bolts.
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