Vertiv Liebert XDU 060, Installer/User Manual

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6.5.2 Flushing the Cooling System
To flush the unit and piping system:
1. Connect the load ends of the supply and return hoses together.
2. Fill the system as described in steps 2 through 6 of Filling the Complete System below.
3. Turn the XDU On and allow pumps to run for several minutes.
4. Turn the unit Off and relieve the system pressure from the bleed hose.
5. Disconnect the supply and return lines from step 1 and drain the water from the unit.
6. Clean and replace the element from the Y-strainer. See Checking and Cleaning the Strainer on page 45.
NOTE: For Y-strainer location, see submittal Component Locations included in the Submittal Drawings on page 59.
6.5.3 Filling the Complete System
NOTE: The closed loop system must be completely installed and connected before filling the system. See Connecting
the Closed Loop System on page 28.
NOTE: Test the water quality when filling the system. See Water Quality Requirements on page 26.
To fill the system:
1. Make connections to the heat load.
2. Open the rear door of the XDU.
3. Connect the water fill source to the fill valve and a drain hose to the high point vent at the top of the unit. See
Figure 6.1 on page 28 and Figure 6.3 on page 30.
4. Turn on the water fill source and allow to run until all of the air is purged from the hose connected to the high
point vents. Failure to properly purge the air will result in pump cavitation and premature pump failure.
5. Remove the hose from the high point vents and allow the water fill source to run for about two minutes. The unit
fill volume is listed in
Fluid Volume for Unit and Connection Piping on page 25.
6. Verify that the pump suction pressure (iCOM parameter XDU.065) is greater than 10 psi.
7. Remove the fill supply line, close the fan panel and quarter-turn screws. Replace the front panel by inserting
tabs at the bottom into the slots and securing the top with the two screws.
It may be necessary to repeat the fill steps after the pump(s) have run to remove trapped air from the system.
Vertiv | XDU™ Liquid to Air Heat Exchanger for Chip Cooling
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