Chapter 4 System Power-On Commissioning 45
4. Switch on the electric heater MCB and change the temperature setpoint to start the electric heater, or start it
manually. Measure all the operation phase currents of the electric heater.
To trigger the electric heater, you should:
Enter the ‘USER MENUS’ -> ‘SETPOINTS’ -> ‘TEMP SET’ to adjust the temperature setting value to ‘T
setting temp
’ (T
setting
temp
= T
return air temp
+ 5, ‘T
return air temp
’ is the present ambient temperature on the LCD). Wait for 1min, and the electric
heater contactor will be closed and the LCD will display 100% output of the electric heater. Adjust the temperature
setting value to ‘T
setting temp
’ (T
setting temp
= T
return air temp
- 5). Wait for 1min, and then the electric heater will stop working. It
indicates that the heating function is normal. Keep this temperature value and no heating requirement is needed. Then
continue with the following procedures.
Note
After commissioning, restore the temperature setpoint to the default or original setpoint.
5. Switch on the infrared humidifier MCB and change the humidity setpoint to start the infrared humidifier, or start it
manually. Measure all the operation phase currents of the infrared humidifier. Manually inject water inlet to the cooling
system to check that the charging pipe and drain pipe do not leak and that the drain pipe is clear.
To trigger the infrared humidifier, you should:
To trigger the humidifier, you should:
Enter the ‘USER MENUS’ -> ‘SETPOINTS’ -> ‘HUM SET’ to adjust the humidity setting value to ‘T
setting hum
’ (T
setting hum
=
T
ambient hum
+ 10%, ‘T
ambient hum
’ is the present ambient humidity on the LCD). Wait for 1min, and the electric heater
contactor will be closed and the LCD will display 100% humidifying output. Adjust the temperature setting value to
‘T
setting hum
’ (T
setting hum
= T
ambient hum
- 10%). Wait for 1min, and then the humidifier will stop working. It indicates that the
humidifying function is normal. Keep this humidity value and no heating requirement is needed. Then continue with the
following procedures.
Note
After commissioning, restore the humidity setpoint to the default or original setpoint.
6. Make sure that the chilled water source is supplied normally. Change the temperature setpoint to start cooling, or
start cooling manually. Measure all the operation phase currents of the compressor in real time. Check the
condensation subcooling degree, suction superheating and air bulbs of the sight glass to make sure that the
compressor works normally, and add refrigerant if necessary.
To start cooling (start the compressor), you should:
Make sure that the unit chilled water is in closed state, and enter ‘SERVICE MENU’ -> ‘SETPOINTS’ to set S138 to
‘20K’.
Enter ‘USER MENUS’ -> ‘SETPOINTS’ -> ‘TEMP SET’ to adjust the temperature setting value to ‘T
setting temp
’ (T
setting temp
= T
return air temp
- 5, ‘T
return air temp
’ is the present ambient temperature on the LCD). Wait for 1min, and the compressor
contactor will be closed and the LCD will display 100% cooling requirement. After at least 3min of running, change the
temperature setting value to ‘T
return air temp
’ (T
setting temp
= T
return air temp
+ 5). Wait for 30s, and then the compressor will stop
working. It indicates that the cooling function is normal.
Note
After commissioning, restore the temperature setpoint to the default or original setpoint.
7 Check the dehumidification function
To trigger dehumidification, you should:
Change the humidify setting (see
) 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 board 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 37.4°F
higher than the temperature setting, the system may enter the forced cooling mode, and the dehumidification demand
will not be responded.
Liebert.PEX2 Series Air Conditioner User Manual
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