Compressor Replacement - Liebert Himod Operation & Maintenance Manual

6.4.9

Compressor Replacement

Infrequently a fault in the motor insulation may result in a motor burn, but in a properly installed
system burnouts rarely occur. Of those that do, most are the effects of mechanical or lubrication fail-
ures, 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 be 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
important to note that successive burnouts of the same system are usually caused by improper clean-
ing.
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.
CAUTION
!
Damage to a replacement compressor caused by improper system cleaning constitutes abuse
under the terms of the warranty, and the WARRANTY WILL BE VOID.
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.
Component Operation and Maintenance 47