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23
Figure 25 Schrader valve location for venting holding charge
6.4.2 Brazing Preparations—Hard-Piped Units
After the holding charge for a hard-piped Liebert XDV has been vented, a torch can be used to remove
the caps over the ends of the supply and return lines.
During brazing, the lines must be filled with flowing dry nitrogen to prevent excessive oxidation and
scale formation inside the piping. Prevailing good refrigeration practices must be employed for piping
supports, leak testing, dehydration and charging. Failure to use good system practices may result in
damage to the system. Refer to the ASHRAE refrigeration handbook for general good-practice refrig-
eration piping.
6.5 Recommended Piping Size
NOTICE
To minimize the amount of refrigerant required, do NOT oversize the piping.
Connect the main pipes between the Liebert XDV branch piping and the Liebert XDP or Liebert XDC
according to Table 4. Elbows and restrictions must be minimized to ensure good fluid flow.
Please see Table 4 below for recommended pipe sizes and Figure 3 for piping segment locations.
SUPPLY (IN)
RETURN (OUT)
SCHRADER VALVE
Front of Liebert XDV
Schrader
Valve
Supply pipe
connection
(1/2" OD)
Return pipe
connection
(5/8" OD)
Rear of XDV
Top of Liebert XDV