Vertiv | Liebert XDH | User Manual
39
Startup Commissioning
2.
Evacuating while XDH is powered Off
If the unit is evacuated during powered Off, in addition to evacuating at the XDP, the system shall be evacuated
at the Schrader valve installed before the XDH electronic expansion valve, as shown in
the red box
below.
Figure 5-2 Location of the Schrader Valve in the XDH Unit
3. Starting the system
• Switch ON the main circuit breaker of the XDP, close the circuit breaker of the power module, and then close
the circuit breaker of pumps 1 and 2.
•
Press the power On button to start the system. Start the XDP and the liquid refrigerant valve. Observe the
opening of the liquid refrigerant valve.
•
After the pump is started, observe the pump speed and head of delivery. Test the running current of the
pump and listen to the sound when the pump is operating.
•
Check for any abnormality in the operation. If the unit is stable, the refrigerant level in the tank should be
observed. If the liquid level is below the lowest level of sight glass, charge some more liquid refrigerant at the
inlet Schrader valve.
•
When the unit is running normally, ensure the liquid level is between the first and the second level in the
liquid sight glass.
shows the refrigerant liquid level in sight glass.
• Evacuate the air in the connecting hose of the composite pressure gauge.
• For safety purpose, before entering the equipment room, wear ear-caps, earplugs and other equipment to
protect hearing.
• The methods for evacuation and charging the refrigerant are same for XDP and XDH units.
