11.3 Replacement Procedures
11.3.1 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:
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.
• 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.
11.3.2 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 Vertiv™ 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 Vertiv™, 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.
Vertiv | Liebert Mini-Mate2—5 ton User Manual| 80
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