Vertiv | Liebert PEX4 | User Manual 76
General Maintenance
4.6. Fan Kit Maintenance
Regular checking of the EC fan includes inspection of the motor operating status, fan impeller state, and the
clearance between the fan and airow-leading ring. Check whether the fan or the airow-leading ring has
been installed properly and rmly. Ensure that the fan blades do not hit the adjacent metal plates under any
circumstances. Clear the clogging element which leads to reduce air volume and aect refrigeration system.
In addition, the fan fault alarm of the control board and alarm point of the EC Fan is connected in series. If the
rotating speed is abnormal, the unit will ideally generate an EC fan fault alarm.
• Turn o the fan/unit prior to replacement of the lter.
• The speed regulating control board of the outdoor EC fan has a possibility of an electrical shock leading
to injury. Therefore, do not touch the board when the unit is powered on.
• While the unit is powered on, do not strictly touch the fan mesh enclosure as it may end up
damaging caused by the fan operation.
4.7. Infrared Humidier
During the normal operation of the infrared humidier, sediment such as mineral particles will accumulate
on its water pan. To ensure eicient operation of the infrared humidier, the sediment needs to be cleaned
regularly. However, the cleansing cycle varies because the water quality is dierent in dierent regions. It is
recommended to check and cleanse (when necessary) the water pan once a month. The auto ush function of
the infrared humidier can prolong the cleaning cycle. However, regular checks and maintenance are necessary.
Cleaning steps:
1. Remove the water level standpipe to drain the water pan.
2. Disconnect the drainage pipe.
3. Remove the safety switch of the water pan.
4. Remove the xing screws at the two ends of the pan and pull out the water pan. Cleanse the water pan with
water and hard brush.
5. Restore the water pan by reversing the preceding procedures.
Before exercising the corresponding operation, ensure that the power supply has been switched o; also,
ensure that the water in the water pan is close to the room temperature before draining the water from the
infrared humidier water pan to avoid the personal injury.
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