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System Operation, Testing and Maintenance
59 Liebert
®
Mini-Mate2
™
9.3 Replacement Procedures
9.3.1 Compressor Replacement
Infrequently a fault in the motor insulation may result in a motor burnout (if system is properly
installed, motor burnout rarely occurs). Primarily this type of failure is due to mechanical or
lubrication problems, where the burnout is a secondary consequence.
Early detection can prevent a large percentage of the problems that can cause compressor failures.
Periodic maintenance inspections by alert service personnel (i.e., identification of abnormal
operation) can be a major factor in reducing maintenance costs. It is easier and more cost-effective to
implement the necessary preventative steps that ensure proper system operation; rather than ignore
a problem until it results in compressor failure and costly replacement. When troubleshooting a
compressor problem, check all electrical components for proper operation:
• Check all fuses and circuit breakers.
• Check pressure switch operation.
• If a compressor failure has occurred, determine whether its cause is an electrical or mechanical
problem.
Mechanical Failure
If you have determined that a mechanical failure has occurred, the compressor must be replaced. If a
burnout occurs, correct the problem and clean the system. It is important to note that successive
burnouts OF THE SAME SYSTEM are usually caused by improper cleaning. If a severe burnout has
occurred, the oil will be black and acidic.
9.3.2 Electrical Failure
In the event of an electrical failure and subsequent burnout of the refrigeration compressor motor,
proper procedures must be followed to thoroughly 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. DAMAGE TO A REPLACEMENT
COMPRESSOR DUE TO IMPROPER SYSTEM CLEANING CONSTITUTES ABUSE UNDER THE
TERMS OF THE WARRANTY, THEREBY VOIDING THE WARRANTY
Replacement compressors are available from your Emerson supplier and will be shipped to the job
site in a reusable crate (as required by the service contractor). If the compressor is under warranty, it
must be returned to Emerson, in order to receive proper warranty credit. It should be returned in the
same container it was shipped in. The possible cause(s) or condition(s) of the damage should be
recorded on the provided return tag.
!
WARNING
Risk of explosive discharge from high-pressure refrigerant. Can cause injury or death.
This unit contains fluids and gases under high pressure. Relieve pressure before working with
piping.
!
CAUTION
Risk of contacting caustic substances. Can cause injury.
Do not touch or contact the gas or oils with exposed skin. Severe burns will result. Wear
protective clothing, safety goggles and long rubber gloves when handling contaminated parts.