Vertiv | Liebert PEX+ Chilled Water | User Manual 88
System Operation and Maintenance
7.2. Routine Maintenance Inspection Items (Semi-Annual)
Refer Table 7-2 for routine maintenance inspection items semi-annually.
Table 7-2 Semi-Annual Routine Checklist of Items
Part Check Item Remark
Air Filter
Check for clogging or damage
Check the filter clog switch
Clean the filter
Fan
Check fan blades are not distorted
Check whether there is bearing wear
Check and fasten the circuit connector
Chilled Water System
Clean pipe system
Check the function of the ball valve
Check if the water system leaks
Electrical heating
system
Check the re-heater operation
Check the erosion situation of the components
Check and fasten the circuit connections
Infrared humidifier
Check clogging of the drain pipes
Check the lamps of the infrared humidifier
Check the mineral sediments on the water pan
Check and fasten the circuit connections
Electrical control part Check and fasten the circuit connections
7.3. Self-Diagnostic System
The iCOM controller provides the diagnostic function of manually opening and closing of components, which is
used to self-test the state of the functional components of the system.
7.4. Check the Electrical Connections and Maintenance
Following are the electrical connections to make visual inspection and treatment:
1. Conduct overall electrical insulation test: find out the unqualified contacts and handle them carefully. Note to
disconnect the fuses or MCBs of the control part during the test before the high voltage should damage the
control components.
2. Check the contactors before power-on and ensure the contactors can act freely without obstruction.
3. Clean the electric and control elements of dust with brush or dry compressed air.
4. Check the closing of contactors for arcs or signs of burning. Replace the contactor if necessary.
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