Vertiv | Liebert PEX+ Chilled Water | User Manual 85
System Start-up Commissioning
Chapter 6: System Start-up Commissioning
This chapter introduces the start-up commissioning of the Liebert® PEX+Chilled Water AC, including preparation
before commissioning, procedures of commissioning and inspection after commissioning.
6.1. Start-up Commissioning
6.1.1. Preparation Before Commissioning
• Mechanical and system part
1. Check that the protection materials during transportation have been removed.
2. The pressure-leak detection of the chilled water system has been done and the chilled water system is
installed according to Vertiv recommendation and local regulations.
3. The cleaning and emptying of the chilled water system have been done (air vent valve is located at the top of
the heat exchanger coil).
4. The chilled water system has been confirmed ready for operation by the Vertiv professionals.
5. The water supply/drainage piping of the humidification system has been reliably connected according to the
material requirements and has been checked for any sign of leakage.
6. Ensure that the equipment room temperature is above 20 °C with suicient heat load. If the heat load is
insuicient, heat the equipment room with other heating devices, or by forcibly running the heater of the
unit or adjacent other equipment (in this case, go through the following procedures till the third step of 6.2
Commissioning Procedures) to ensure the heat load is suicient for the commissioning of the unit.
• Electrical part
1. Check that the input voltage of the main power is 380 V (-10%) to 415 V (+6%).
2. Check that all electrical or control cables are correctly connected. Fasten all the connecting terminals.
3. The power supply cables and the low voltage control cables are separated.
6.2. Commissioning Procedures
1. Turn o the MCBs of various parts. Turn on the main MCB and control MCB and check the control voltage.
Switch on the unit using the iCOM display.
2. Switch on the fan MCB and click on the contactor of the fan to confirm the rotation direction of the fan. Start
the unit and measure the current of the fan.
3. Switch on the electrical reheat MCB and change the temperature setting to start the electrical reheat, or start
the reheat manually. Measure all the phase current of the electrical reheat. To trigger the electrical reheat:
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