Liebert DM Series, Руководство пользователя

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Chapter 6 System O&M 57
Liebert_DM 16kW Air Conditioner User Manual
7. Install the new compressor, and connect the pipes and electric cables.
8. Pump the system vacuum and add refrigerant in accordance with the commissioning regulations.
9. Power on the system by following the ordinary startup commissioning procedures and check the system operation
parameters. Observe the refrigerant state through the sight glass, and determine the amount of refrigerant to be added
by considering the system pressure and temperature until the system enters normal operation.
6.2 Operation and maintenance of outdoor unit
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.
6.2.1 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 heat exchanger regularly.
2. Clean the fin of heat exchanger with compressed air or fin detergent (weakly alkaline) if the condenser air flow is
blocked. The direction of inverse air flow 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 whether the fan runs normally, check it for problems such as abnormal noise, vibration and bearing failure.
Fan speed controller
Check whether the fan speed controller board operates normally. If not, replace it as illustrated in the following
paragraph.

Note
Note that the position of 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. Remove the cover plate of electrical control box before
removing the fan speed controller board. Except for the seven bolts in Figure 6-6, other bolts are prohibited to be
removed. 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 the other five
bolts to fix the fan speed controller board.