10.7.6 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. Can cause explosive
discharge of high-pressure refrigerant, 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. For systems requiring EU CE compliance
(50Hz), the system installer must provide and install a pressure relief valve in the high side
refrigerant circuit that is rated same as the refrigerant high side “Max Allowable Pressure”
rating that is marked on the unit serial tag. Do not install a shutoff valve between the
compressor and the field installed relief valve. The pressure relief valve must be CE-certified to
the EU Pressure Equipment Directive by an EU “Notified Body.”
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.
7. Install replacement compressor and make all connections. Replace gaskets or seals on service
valves. Replace unloading solenoid.
8. Evacuate, charge and operate per the appropriate procedure per local codes:
• Evacuation, Leak-testing, and Charging Air-cooled Systems withReceivers on page40
NOTICE
Risk of improper component re-installation. Can cause equipment damage.
Identify and mark location of suction pressure transducer and discharge pressure switch.
These devices look similar and they must be reinstalled in their original location.
10.8 Evaporator Coil Performance
The DA080, 085, 125, 150, and 165 units contain nested A-frame coils. This results in different evaporator
(suction) temperatures between System 1 and System 2. The outer A-coil (System 1) will operate at a
higher evaporator temperature than the inner A-coil (System 2) when operating at the same compressor
loading.
The DA050 is a single-circuit A-frame coil.
Vertiv | Liebert® DSE™ Installer/User Guide
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