Vertiv | Liebert® DM | User Manual 99
System Operation and Maintenance
Check the following particulars before replacing the compressor:
1. Check that all fuses and circuit breakers are normal.
2. Check the working status of the high and low pressure switches.
3. Check the relative historical alarm information.
4. Check the compressor operation record.
5. Check the motor electrical characteristic.
System contains refrigerant. Recover refrigerant using standard recovery equipment before maintenance.
Refer the following procedure to remove and replace the failed compressor:
1. Cut o the power supply.
2. Attach suction and discharge gauges to compressor access fitting.
3. Recover the residual refrigerant by using standard recovery procedures.
4. Remove the failed compressor.
5. Follow manufacturer’s instructions to clean out piping kit.
6. Install replaced compressor and make all connections, perform pressurization and leakage tests of the system at
approximately 150 psig (1034 kPa).
7. Evacuate the system twice to 1500 microns and the third time to 500 microns. Break the vacuum each time with clean
and dry refrigerant to 2 psig (13.8 kPa).
8. Charge the system with refrigerant based on the requirements of the evaporator, condenser and piping.
9. Apply power and operate the AC unit. To check for proper operation, make sure the circulation suction pressure and
discharge pressure are in normal operation ranges. Add some refrigerant if necessary.
Release of refrigerant to the atmosphere is harmful to the environment. Refrigerant must be recycled in
accordance with state and local regulations.
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