Maintenance
18 Liebert
®
InteleCool
®
2
6.6.1 Compressor Replacement
Replacement compressors are available from your Emerson
®
supplier. They will be shipped in a
reusable 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 until the failed compressor 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 should be recorded by marking the compressor return
tag.
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.
4. Disconnect all electrical connections.
5. Remove failed compressor.
6. Install replacement compressor and make all connections.
7. Pressurize and leak test the system at approximately 150 PSIG (1034 kPa) pressure.
8. Follow manufacturer’s instructions for cleanout kits.
9. Connect a vacuum pump to both the high and low sides of the system through properly sized
connections. Evacuate the system twice to 1500 microns, and the third time to 500 microns. Break
the vacuum each time with dry nitrogen to 2 PSIG (13.8 kPa).
10. Charge the system with refrigerant. Refer to unit serial tag for refrigerant charge amount.
11. Apply power and operate system.
12. Check for proper operation. Suction and discharge pressures will vary with load conditions and
coil efficiency. The low-pressure switch will shut the compressor down if the suction pressure falls
below the cutout setting. Conversely, the high-pressure switch will shut down the compressor if
the discharge pressure exceeds the cutout setting. High suction pressure reduces the ability of the
refrigerant to cool compressor components and can result in compressor damage. Refer to
Table 4.
CAUTION
Risk of explosive discharge of high-pressure refrigerant. Can cause personal injury or
equipment damage.
Do not loosen any refrigeration or electrical connections before relieving system pressure from
both sides of the compressor.
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.
NOTE
The optional three-phase scroll compressor must rotate in the correct direction to ensure proper
system operation. Wiring must be phased and connected as shown:
• PHASE “A” to T1 or Ll
• PHASE “B” to T2 or L2
• PHASE “C” to T3 or L3
NOTE
High-side gauge port is a liquid line connection. Proper procedures should be followed when
installing and removing gauges. A 6-foot (1.8 m) hose can hold up to 3 oz (0.1 l) of refrigerant.
Be sure to purge high side to low prior to removal.
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