Infrared Humidifier; Electric Heater - Emerson Liebert.PEX+ Series User Manual

68 Chapter 7 System Operation And Maintenance
service alarm is triggered. User needs to replace the filter based on the clogging condition of the filter. The filter must
be checked once a month, and be replaced as required during operation.
 Note
 Cut the power before replacing the filter.
 Clear the fan running time to 0 after replacing the filter.

7.8 Infrared Humidifier

During the normal operation of the infrared humidifier, sediment such as mineral particles will accumulate on its water
pan. To ensure efficient operation of the infrared humidifier, you need to clean the sediment regularly. However, the
cleansing cycle varies because the water is different in different regions.It is recommended to check, and cleanse
(when necessary) the water pan, once a month. The autoflush function of the infrared humidifier can prolong the
cleansing 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 fixing 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.
！
warning
 Before exercising the corresponding operation, make sure that the power has been cut off; and also ensure that
the water in the water pan is close to the room temperature before draining the water from the infrared
humidifier water pan so as to avoid the personal injury.

7.9 Electric Heater

The electric heater is as shown in Figure 7-2.Three temperature switches are series connected to the control loop
inside the electric heater, including two automatic reset switches and one manual reset switch.
1. Check the rustiness condition of the electric heater; use the iron brush to get rid of the rust, or replace it according
to actual conditions.
2. When there is heating requirement, but no heating effect, you should use a multimeter to check whether the cable
connected to temperature switch is in action, so as to ensure the three temperature switches are normal.
3. If the cable is not in action, you should remove the electric heater to check whether the manual reset switch is
disconnected, the automatic reset switch or the electric heater pipe is damaged.
Auto reset temp switch
Liebert. PEX+Series Precision Air Conditioner
Manual reset temp switch
Auto reset temp switch
Figure 7-2 PTC electric reheat
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