Dust Filter - Liebert DM User Manual

8. Check the specification and aging situation of the control cable and power cable between the indoor unit and the
condenser, and replace the cable when necessary.
9. Use temperature/humidity measuring meter with high precision to proof-read and calibrate the temperature/humidity
sensor. Note to set the humidity control mode to RH control during the process of calibration.
10. Check the following external sensors.
1) Smoke detector (optional)
The power supply of the smoke detector is located at the bottom (or top) of the upflow (or downflow) unit. It
incessantly samples the air, analyzes the samples and makes judgment. It requires no calibration.
2) Water leak detector
The water leak detector has a dry contactor. The contactor will close when the detector probes detect water or
other conductive liquid.
The detector should be placed away from any water pool or drainage trench on the floor, 2m ~ 2.5m away from the
machine. Do not place it directly under the machine. The recommended location for the water leak detector is
shown in Figure 6-1.

Note
1. Before connecting any mechanical parts or cables, make sure the power supply of the control unit has been disconnected.
2. Do not use the water leak detector adjacent to flammable liquid or use it to detect flammable liquid.
11. Adjust the set points. Check the auto-flush control logic and HG bypass logic of water pan of the infrared humidifier
and the action of the functional parts according to control logic.
12. Simulate the fault scenario to check the work state of protection devices including high/low voltage alarm, high/low
temperature alarm, high/low water level alarm and over-temperature protection device.

6.1.3 Dust Filter

To ensure efficient operation, the dust filter must be checked once a month, and be replaced as required. The filter
clogging switch and pressure difference switch are located as shown in Figure 6-2.
Location of leak
detection sensor
Location of leak
detection sensor
Figure 6-1 Recommended location for the water leak detector
过滤网堵塞开关调节旋钮
Rotary switch for filter
clogging switch
过滤网堵塞开关
Filter clogging switch
风机气流安全开关
Pressure difference
switch
Figure 6-2 Filter clogging switch and pressure difference switch
Liebert_DM 16kW Air Conditioner User Manual
Liebert system
Drain pipes on the ground
Chapter 6 System O&M 51