Electrical Failure - Liebert Mini-Mate2 MMD24E User Manual

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.
Replace a Failed Compressor
Proper procedures to remove and replace the failed compressor are:
1. Disconnect power
2. Attach suction and discharge gauges to access fittings.
3. Recover refrigerant using standard recovery procedures and equipment. Use a filter-drier when
charging the system with recovered refrigerant.
NOTE
Release of refrigerant to the atmosphere is harmful to the environment and unlawful.
Refrigerant must be recycled or discarded in accordance with federal, state and local
regulations.
4. Remove failed compressor.
5. Install replacement compressor and make all connections. Use a flow of dry nitrogen through the
piping during brazing to prevent formation of copper oxide scale inside the piping. Copper oxide
forms when copper is heated in the presence of air. POE oil will dissolve these oxides from inside
the copper pipes and deposit them throughout the system, clogging filter driers and affecting
other system components.
A pure dry nitrogen flow of 1-3 ft
displace the air. Control the flow using a suitable metering device.Pressurize and leak test the
system at approximately 150 psig (1034kPa) pressure.
6. Follow manufacturer's instructions for clean out kits.
7. Evacuate the system twice to 250 microns. Break the vacuum each time with clean, dry nitrogen.
8. Evacuate the system a third time to 250 microns.
9. Charge the system with refrigerant (R-407C) based on requirements of the evaporator,
condensing unit and lines. Refer to the unit nameplate.
10. Apply power and operate the system. Check for proper operation. Refer to Table 29.
® ™
Liebert Mini-Mate2
3 /min (0.5-1.5 l/s) inside the pipe during brazing is sufficient to
66
System Testing and Maintenance