Commissioning Complete Inspection - Liebert DM User Manual

34 Chapter 4 System Start-up And Commissioning
Observe the compressor suction pipes and make sure there is no water condensing on the surface of the compressor
and the pipes, so as to avoid the risk of slugging the compressor.
At the return of 22℃/50%, 16Bar ~ 17Bar condensing pressure, the compressor suction pressure should be above 5
Bar.
At the return of 24℃/50%, 16Bar ~ 17Bar condensing pressure, he compressor suction pressure should be above
5.5Bar.
4) Check the dehumidification function
To trigger dehumidification, you should:
Change the humidify setting to 10% lower than the indoor RH. The control system should then trigger the call for
dehumidification, the dehumidification solenoid valve switches on, and the dehumidification indicator Q3 on the control
panel turns on. Then change the humidity setting higher than the indoor RH. If the dehumidification solenoid valve
switches off, and the dehumidification indicator Q3 turns off, it means the dehumidification function is normal. Note that
during the commissioning process, if the indoor temperature is 3℃ higher than the temperature setting, the system
may enter the forced cooling mode, and the dehumidification demand will not be responded.

Note
After the test, restore the humidity setting to the default or the original setting.

4.2.3 Commissioning Complete Inspection

1. Check that all output functions are automatic.
2. Check that the temperature & humidity settings and control precisions are set reasonable.
3. Make sure all the other functions are set reasonable.
DM Series 16kW Air Conditioner User Manual