Vertiv | Liebert PEX4 | User Manual 73
General Maintenance
Chapter 4: General Maintenance
The system operation and maintenance of the Liebert PEX4 air conditioner are explained in brief from an
end-user perspective. It includes information related to routine maintenance and inspection of electrical
connections, wiring, system diagnosis, visual appearance checks, and drainage maintenance among others.
Prior to operation and maintenance, the lethal voltage may be present in the equipment which can be fatal.
All notes, warnings, and cautions marked on the equipment as well as the ones mentioned in the manual
must be considered, otherwise, it may leads to injury and fatality.
Only qualied service and maintenance personnel can perform system operation and maintenance.
4.1. Manual Operation Function
The controller features a diagnostic function that enables the user to manually turn On/ O the components on
site to check, if the components are working normally.
4.2. Electrical Connection Inspection
The inspection items include:
1. Conduct overall electrical insulation test, nd out the unqualied contacts and handle them. Note to
disconnect the fuses or MCBs of the control part during the test that 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 a brush or dry compressed air.
4. Check the closing of contactors for arcs or signs of burned. Replace the contactor if necessary.
5. Fasten all the electrical connection terminals.
6. Check that the sockets and plugs are in good condition. Replace those loosen ones.
7. If the power cables are damaged, to avoid any further damage, the cables must be replaced by professional
personnel.
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