Vertiv | Liebert PEX+ Chilled Water | User Manual 86
System Start-up Commissioning
4. Change the temperature setting to 5 °C higher than the equipment room temperature. The system should
then trigger the call for heating and the electrical reheating starts to work. Then set the temperature setting
to 5°C lower than the equipment room temperature. If the electrical heater stops working, it means the heating
function is normal.
Continue the following commissioning steps.
• Switch on the humidification MCB and change the humidity setting to start the humidifier, or start the
humidifier manually. Measure all the phase current of the humidifier. Manually charge water into the cooling
system to check that the charge/drainage piping do not leak and the drainage pipes are clear.
• To trigger the humidifier:
Adjust the humidity setting to 10% higher than the relative humidity of the equipment room. The control
system should then trigger the call for humidification, and the humidifier starts to work. If the humidifier stops
working when the humidity setting is lower than the relative humidity of the equipment room, it means the
humidifying function is normal.
After commissioning, restore the temperature and humidity setting to the default or the original setting.
5. Change the temperature setting and start cooling or start the cooling manually. Record the water flow
quantity of the system and water resistance. To start cooling (open the water flow control valve), then change
the temperature setting to 5 °C lower than the equipment room temperature. The control system should then
trigger the call for cooling, and the water flow control valve opens. After at least three minutes of cooling,
change the temperature setting to 5 °C higher than the equipment room temperature. The water flow control
valve should close.
6. Change the humidity setting and the unit will enter a dehumidifying status. Record the water flow quantity of
the system and water resistance.
To trigger dehumidification:
Change the humidity setting to 10% lower than the relative humidity of the equipment room. The control
system should then trigger the call for dehumidification; the water flow control valve opens. Note that during
the commissioning process, if the equipment room temperature is 3 °C higher than the temperature setting,
the system may enter the forced cooling mode, and the dehumidification demand will not be responded. After
commissioning, restore the humidity setting to the default or the original setting.
6.3. Inspection after Commissioning
1. Check that all output functions are working well.
2. Check that all temperature and humidity settings have been set correctly according to customer requirement.
3. Ensure that all the other setting functions are correct.
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