9.10.5 Unloading Solenoid(s) on a Digital-scroll Compressor
When replacing a digital-scroll compressor, the digital solenoid valve and coil must be replaced. The
compressor and valve kit are shipped separately. The valve kit must be field-brazed to the top of the
compressor in proper orientation and supported with the original factory bracket.
9.10.6 Replacing the Compressor
WARNING! Risk of electric shock. Can cause serious injury or death. The Liebert iCOM
microprocessor does not isolate power from the unit, even in the "Unit Off" mode. Some internal
components require and receive power even during the "unit off" mode of the Liebert iCOM
control. Open all local and remote electric power disconnect switches and verify with a
voltmeter that power is Off before working on any component of the system.
WARNING! Risk of over-pressurization of the refrigeration system and explosive discharge of
high-pressure refrigerant. Can cause loss of refrigerant, environmental pollution, equipment
damage, injury or death. This unit contains fluids and gases under high pressure. Use extreme
caution when charging the refrigerant system. Do not pressurize the system higher than the
design pressure marked on the unit's nameplate. Local building or plumbing codes may require
installing a fusible plug or other type of pressure-relief device in the system.
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. Attach suction and discharge gauges to access fittings.
2. Front-seat service valves to isolate the compressor. Recover refrigerant using an approved
recovery procedure and equipment. Use a filter drier when charging the system with recovered
refrigerant.
3. Remove marked pressure transducer and discharge pressure switch. Disconnect all electrical
connections.
4. Detach service valves from compressor.
5. Remove failed compressor.
6. If required, follow compressor manufacturer’s suggested clean-out procedures.
Vertiv | Liebert® PDX™ and PCW™ Installer/User Guide | 86
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