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Piping Connections and Piping Access Points
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5.3 Recommended Piping Size
Connect the main pipes between the Liebert XDCF branch piping and the Liebert XDP or Liebert
XDC according to Table 1. Elbows and restrictions must be minimized to get good fluid flow.
Connect the branch pipes between the main piping and the Liebert XDCF according to Table 1.
5.4 Connecting Liebert XD Flex Pipes to Liebert XDCF Modules
1. Remove the caps on the supply and return lines on the top of the Liebert XDCF.
2. Lubricate the threads, diaphragm and O-ring with one or two drops of mineral oil.
3. Connect the line-set coupling finger-tight.
4. Make sure the Schrader valve is properly oriented; refer to the label on the top of the Liebert
XDCF.
5. Hold the backup hex nut with a wrench while tightening the swivel nut.
6. Tighten the swivel nut on the female coupling until it is seated or a definite resistance is felt.
7. Once a definite bottoming resistance is felt (as in metal to metal), place a mark lengthwise from
the swivel nut to the backup hex and tighten the swivel nut on the female coupling an additional
1/4 turn.
8. Tighten both the supply fittings and the return fittings to 35-45 ft/lb (47-61Nm).
9. Mark the female and male coupler with for future reference.
5.5 Connecting a Liebert XDCF with Liebert XD Flex Pipe to an Operational Liebert XD
System
Tools Required
• Two adjustable wrenches, with a maximum adjustment size of 2-1/2 inches
• Screwdriver, Phillips or blade type
1. Determine the port location of the supply and return piping overhead
2. Make sure the service valve for each port is closed
3. Remove cap for only the required ports. Do not remove caps from the unused ports.
4. Once Step 3 has been completed, remove the pipe plugs that are supplied on the Liebert XD Flex
Pipe.
Table 1 Branch piping sizes for refrigerant loop
Pipe Function Size / Equivalent Pipe Length
Liebert XDP/Liebert XDC supply line, from
Liebert XDP/Liebert XDC supply
to farthest Liebert XDCF
1-1/8" OD (1.025" ID) for lengths up to 60 feet (18m)
1-3/8" OD (1.265" ID) for lengths over 60 but less than 175 feet (18 to 53m)
Liebert XDP/Liebert XDC return line, from
farthest Liebert XDCF to Liebert XDP/Liebert
XDC return
2-1/8" OD (1.985" ID) for lengths up to 60 feet (18m)
2-5/8" OD (2.465" ID) for lengths over 60 but less than 175 feet (18 to 53m)
From Liebert XDCF supply to supply line of
Liebert XDP/Liebert XDC
1/2" OD (0.430" ID) for lengths up to 6 feet (1.8m)
5/8" OD (0.545" ID) for lengths over 6 feet but less than 35 feet (1.8-10.6m)
From Liebert XDCF return to return line of
Liebert XDP/Liebert XDC
5/8" OD (0.545" ID) for lengths up to 6 feet (1.8m)
7/8" OD (0.785" ID) for lengths over 6 feet but less than 35 feet (1.8-10.6m)
NOTE
Before connecting the Liebert XDCF with Liebert XD Flex Pipe to the prefabricated piping
mains, check the entire system for leaks.
Check the Liebert XDCF to ensure that the unit has no refrigerant leaks.
Read all instructions before beginning installation.
NOTE
This operation requires two people.