Chapter 7 System Operation And Maintenance 85
9. Use temperature and humidity measuring meters with higher precision to measure and calibrate the temperature
and humidity sensors.
Note
Set the humidity control mode to ‘relative humidity control’ during calibration process.
10. Adjust the setpoints. Check the action of the functional parts and the auto-flush control logic of water pan of the
infrared humidifier according to control logic.
11. For dual cooling unit, use the gauge with higher temperature and precision to check and calibrate the sensor
temperature of the free cool system.
12. Simulate and check the operation of the protection devices including high and low pressure alarm, high and low
temperature alarm, high water level alarm and over-temperature protection.
13. Check the following external sensors.
1) Smoke sensor (optional).
The power supply of the smoke sensor is located at the bottom (or top) of the upflow (or downflow) unit. It constantly
samples the air, analyzes the samples and makes judgment. It requires no calibration.
2) Water detection sensor.
Bridge the water detection sensor probes and confirm the alarm through the iCOM controller.
The sensor should be placed away from any water pool or drainage trench on the floor, 2m ~ 2.5m away from the unit.
Do not place it directly under the unit. The recommended installation location of the water detection sensor is shown in
Figure 7-1.
Drain pipes on the ground
Location of water
detection sensor
detection sensor
Liebert unit
Location of water
Figure 7-1 Recommended location for the water detection sensor
Note
1. Before fastening the connection of any mechanical parts or cables, make sure that the power supply of the control unit has
been disconnected.
2. Do not use the water detection sensor adjacent to flammable liquid or use it to detect flammable liquid.
Liebert.PEX2 Series Air Conditioner User Manual
Summary of Contents for Liebert PEX Series
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