Chapter 4 Maintenance And Troubleshooting; Maintenance - Emerson Liebert PEX User Manual

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Chapter 4 Maintenance And Troubleshooting

Chapter 4 Maintenance And Troubleshooting
This chapter introduces the maintenance and troubleshooting of the condenser. Users should check the condenser
regularly and solve the problems in time.
Note
1. The maintenance of the condenser must be done by technicians.
2. Except for the commissioning items that must be carried out with power-on, during maintenance, the power of the indoor unit
and the air switch of the condenser must be cut off.

4.1 Maintenance

Refrigeration system
1. Check that the refrigeration pipes are firmly fixed. The refrigeration pipes shall not shake with the vibration of wall,
earth or equipment frame. Otherwise, reinforce the refrigeration pipes with fastening objects.
2. Check that there is no oil on the accessories of all refrigeration pipes, and make sure that the pipes do not leak.
Heat exchanger
1. Clean the fin of the heat exchanger regularly.
2. Clean the fin of the heat exchanger with compressed air or fin detergent (weakly alkaline) if the condenser airflow is
blocked. Inverse airflow is good when the compressed air is used.
3. Check for damaged fins and maintain them in time.
4. Avoid snow accumulation around the condenser in winter.
Fan
Check that the fan runs normally. Check it for problems such as abnormal noise, vibration and bearing failure.
Fan speed controller
Check that the fan speed controller board operates normally. If not, replace it as illustrated in the following paragraph.
Note
Note that the positions of the bolt installation holes on the fan speed controller could be different on the actual product.
The fan speed controller is inside the electrical control box (see Figure 1-2 and Figure 1-3). Rotate the isolation switch
to 'OFF', and then remove the cover plate of the electrical control box, as shown in Figure 4-1. Remove the cover plate
of the electrical control box before removing the fan speed controller board. Except for the seven bolts in Figure 4-2,
other bolts are prohibited to remove. The bolt 1 and bolt 2, which are used to fix the heat sink on the fan speed
controller board, must be fastened firstly. The heat sink must cling to the floor of the electrical control box. After
installing the heat sink, use other five bolts to fix the fan speed controller board.
OFF
ON
Figure 4-1 Fan speed controller board
Liebert.PEX Condenser User Manual