NOTE: Failure to properly clean the system after a compressor motor burnout will void the compressor
warranty. Follow the manufacturer’s procedure.
NOTICE
Risk of contact with caustic substances. Can cause personal injury. Avoid touching or contacting the gas
and oils with exposed skin. Severe burns may result. Use long rubber gloves in handling contaminated
parts.
4.2.2 Mechanical Failure
If a mechanical failure has occurred, the compressor must be replaced.
4.3 Compressor Replacement
Replacement compressors are available from Vertiv. They will be shipped in a permanent crate to the job
site as required by the service contractor.
Upon shipping a replacement compressor, the service contractor will be billed in full for the compressor.
Credit for warranty replacement compressors will not be issued until the replacement has been returned
to the factory. The compressor should be returned in the same container used for shipping to the job. The
possible damage causes or conditions that were found must be recorded by marking the compressor
return tag.
CAUTION: Risk of high-pressure refrigerant leakage. Can cause environmental pollution and
personal injury. Do not loosen any refrigeration or electrical connections before relieving
pressure.
NOTE: Release of refrigerant to the atmosphere is harmful to the environment. Refrigerant must be
recycled or discarded in accordance with federal, state, and local regulations.
1. Disconnect power.
2. Attach suction and discharge gauges to access fittings.
3. Recover refrigerant using approved recovery procedures and equipment. Use a filter drier
when charging the system with recovered refrigerant.
4. Unsweat refrigerant connections and disconnect electrical connections.
5. Remove failed compressor.
6. Install replacement compressor and make all connections.
7. Pressurize and leak test the system.
8. Follow manufacturer’s instructions for cleanout kits.
9. Evacuate the system twice to a minimum 500 microns, breaking the vacuum with dry nitrogen
each time. The third time, evacuate to 500 microns and verify the above levels are maintained
for at least one minute after the unit is isolated by a shutoff valve from the vacuum pump.
10. With the system in a 500 micron or lower vacuum, charge the system with liquid refrigerant
based on requirements of the evaporator, condensing unit and lines. Refer to General System
Charge Requirements on page21 or unit nameplate for system charge requirements.
11. Apply power and operate system. Check for proper operation. Refer to Electrical Connections
on page22.
Vertiv | Liebert PFH Installer/User Guide | 34
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