Emerson Liebert Challenger With Liebert iCOM Control 3000/ITR - Manual (Page 54)

Component Operation and Maintenance
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7.5.2 Standard Scroll Compressor Replacement
Infrequently a fault in the motor insulation may result in a motor burn, but burnouts rarely occur in
a properly installed system. 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 occurs, 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 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.
For clean-out warnings and procedures, see Copeland Application Engineering Bulletin 24-1105
“Principles of Cleaning Refrigeration Systems” or Carlyle Service Guide, Literature # 020-611.
NOTICE
Damage to a replacement compressor caused by improper system cleaning constitutes abuse
under the terms of the warranty, and the warranty will be void.
NOTICE
Risk of improper scroll compressor installation. Could cause poor performance and
compressor damage.
!
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. Do not loosen any refrigeration or electrical connections before relieving pressure.
!
CAUTION
Risk of contact with hot substances or surfaces. Can cause injury.
Avoid touching or contacting the gas and oils with exposed skin. Severe burns will result. Use
long rubber gloves in handling contaminated parts. Use extreme caution and wear protective
gloves and arm protection when working on or near hot compressors, discharge lines,
humidifiers and reheats.
NOTE
Release of refrigerant to the atmosphere is harmful to the environment and is unlawful.
Refrigerant must be recycled or discarded in accordance with federal, state, and local
regulations.