Vertiv | Liebert® DM | User Manual 102
System Operation and Maintenance
7.5. Routine Maintenance and Inspection (Semi-annually)
Refer Table 7-3 for the semi-annual routine maintenance and inspection items.
Table 7-3 Routine Maintenance Checklist (Semi-annually)
Components Inspection Particular Remark
Compressor
Check for any signs of oil leaks.
Listen to running sounds and observe operation vibrations.
Refrigeration
cycle system
Check suction pressure, exhaust pressure and suction superheat are as per
setpoints.
Check if the evaporator is functioning normally.
Check system circulation and moisture content (observed through sight).
Check whether there is an obvious temperature dierence before and after
drying the filter.
Check Thermal Expansion Valve (TXV) is firmly connected.
Check the refrigerant piping. The refrigerant line must have a suitable bracket
and must not be placed against the wall, floor or fixed frame.
Air-cooled
condenser
Check if the condenser coil is clogged, clean immediately if it is blocked.
Check if the motor is firmly mounted.
Check if there is any distortions in impeller rotation, also check bearings if they
are in good condition.
Check if the refrigerant piping are properly supported.
Electrical board
Check all electrical connections are firmly tightened.
Check the surface of the circuit board for signs of corrosion.
Electrical heater Check heating element for signs of corrosion or burning.
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