Vertiv | Liebert XDH | User Manual
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System Operation And Maintenance
7.7.Cooling System Maintenance
The cooling system components must be inspected monthly to detect any abnormalities in the operation that
cause abrasions due to continuous operation. As the failure or damage of components is usually accompanied
by corresponding faults, regular checks are required to prevent most system failures.
The surface of the evaporator coil should be kept clean and have no rupture.
The major reasons for EEV failure are related to electrical failure and/ or mechanical failure. The electrical failure
can be attributed to the failure of the power supply of the EEV control panel and coil, loosely connected control
board wiring, and pressure & temperature sensor failure. The mechanical failure in an EEV can be the effect of
blocking in the refrigerant flow. Therefore, pay close attention to the control panel power supply, control board
wiring, pressure & temperature sensor wiring or the valve itself when the EEV is defective.
Refrigerant pipes must be fixed properly and must not vibrate against the wall, floor or frame of the unit. Inspect
every six months (semi-annual) all refrigerant pipes and bracket for the signs of wear.
• It is not recommended to adjust the electronic expansion valve without prior permissions. If need arises,
contact Vertiv local representative.
7.8.Condensate Water Drain System Maintenance
In order to ensure the proper drain process of condensate water, the condensate pan should be checked
periodically to ensure that there is no water scales, debris and leakage in the water drain pan.
In addition, check whether the power supply of the drain pump is proper, whether the wiring is secure, whether
the drain pump is blocked, and whether the drain pipe is unobstructed.
