Vertiv | Liebert XDH | User Manual
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Startup Commissioning
Chapter 5: Startup Commissioning
This chapter describes the startup commissioning, including specific operations.
5.1.Preparations Before Commissioning
1. Mechanical Part
•
Ensure that the piping between the XDP and each XDH are soldered to connect as an entire system.
•
Follow the instructions at the valve to open all valves in the refrigerant loop.
•
Ensure that the total system charge has been roughly accounted.
•
Connect the condensate water drain system and inspect the leakages, if any.
• Ensure that the room temperature has at least 40% heat load of the design heat load; if not, use
other heating devices to warm up the room to ensure necessary amount of heat load is available for
commissioning.
2. Electrical Part
• Ensure that the input voltage of the main power supply is within ± 10% of the rated voltage and that the
power disconnector is closed.
•
Ensure that all electrical or control connections are correct, and tighten all electrical and control connectors.
•
Ensure that the power cable and low-voltage control cable are separately arranged.
•
Ensure that the high-water-level cable is correctly connected.
5.2.Commissioning Procedure
Because the XDP host and XDH end are connected as a system, the host and the end adopt the same
commissioning method.
5.2.1.Maintaining the Pressure
Connect the high and low-pressure composite pressure gauge to the XDP pump inlet and outlet valves
(Schrader valve position as shown in
), fill the system with 27 bar of nitrogen, and initially check for
any obvious leakage.
•
If a refrigerant leakage is evident (focus on the soldered joints) and repair the leakage.
•
If no refrigerant leakage occurs, maintain pressure (at least for 24 hours) and check if the pressure is
reduced after 24 hours.
