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Component Operation and Maintenance, Checks and Adjustments
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7.4.9 Compressor Replacement
Infrequently, a fault in the motor insulation may result in a motor burn. However, in a properly
installed system, burnouts rarely occur. Of those that do, most are the effects of mechanical or lubri-
cation failures, resulting in the burnout as a secondary consequence.
If problems that can cause compressor failures are detected and corrected early, a large percentage
can be prevented. Periodic maintenance inspections by alert service personnel on the lookout for
abnormal operation can be a major factor in reducing maintenance costs. It is easier and far less
costly to take the steps necessary to ensure proper system operation than it is to allow a compressor
to fail and require replacement.
When troubleshooting a compressor, check all electrical components for proper operation.
1. Check all fuses and circuit breakers.
2. Check Hi-Lo Pressure switch operation.
3. If a compressor failure has occurred, determine whether it is an electrical or mechanical failure.
Mechanical Failure
A mechanical compressor failure will not be indicated by a burned odor. The motor will attempt to
run. If you have determined that a mechanical failure has occurred, the compressor must be replaced.
If a burnout does occur, correct the problem that caused the burnout and clean the system. It is impor-
tant to note that successive burnouts of the same system are usually caused by improper cleaning.
Electrical Failure
An electrical failure will be indicated by a distinct pungent odor. If a severe burnout has occurred, the
oil will be black and acidic.
In the event that there is an electrical failure and a complete burnout of the refrigeration compressor
motor, the proper procedures must be performed in order to clean the system to remove any acids that
would cause a future failure.
There are two kits that can be used with a complete compressor burnout - Sporlan System Cleaner
and Alco Dri-Kleener. Follow the manufacturer's procedure.
!
CAUTION
Avoid touching or contacting the gas and oils with exposed skin. Severe burns will result. Use
long rubber gloves in handling contaminated parts.
NOTE
Damage to a replacement compressor caused by improper system cleaning constitutes abuse
under the terms of the warranty, and the WARRANTY WILL BE VOID.