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Piping
27
Figure 29 Detail view of Liebert XD Flex Pipe and prefabricated piping port
8. Repeat Steps 6 and 7 for the smaller coupler (supply line).
9. Once the supply and return connections are completed, check to make sure the Liebert XDV fan
power switches are Off, then connect the power cords to their power sources.
10. Turn the fan switches on. Ensure that the fans operate.
11. Open the return service valve first, then open the supply service valve.
With the fans running, cool air is discharged from the front of the Liebert XDV.
Figure 30 Liebert XD system with prefabricated piping assembly and Liebert XD Flex Pipe
Tighten collar
with wrench.
DO NOT
OVERTIGHTEN!
Service Valve
Note:
Make sure the valve
is closed before attaching
flex pipe to the system.
Hold threaded coupler here
with a wrench to keep the
pipe stationary while tightening
collar with another wrench.
Flex Pipe
Supply Side Torque Range for
1/2" coupler is 22.1 to 25.8 lb/ft (30-35Nm)
Return Side Torque Range for
1" coupler is 59 to 62.7 lb/ft (80-85Nm)
Return Service Valve
Make sure valve is
open after system
leak check
Supply Service Valve.
Make sure valve is
open after system
leak check
Return Liebert
Flex Pipe
from XDV unit
Supply Liebert Flex Pipe
from Liebert XDV unit
Return
Main
Supply Main