Piping
22
6.7.3 Connection Methods—Removable Couplings
The assembly and connection means used for piping in the Liebert XD system are the same as those
used in conventional refrigeration systems. Observe all standard practices during installation and
startup to prevent damage and contamination.
Both supply and return fittings may be supplied with optional, removable couplings.
Figure 21 Piping location and connection sizes—modules with removable couplings
6.7.4 Connect Liebert XD Flex Pipe with Removable Coupling to a Liebert XD Cooling Module
Tools Required
• One adjustable wrench with a maximum adjustment size of 2 inches
• One torque wrench, half-inch drive (see
Table 3
for sizes)
1. Check the Liebert XD Flex Pipe for proper length.
2. Remove the protector plugs from the Liebert XD Flex Pipe.
3. Remove the protector cap from the couplings on the module.
4. Wipe the fittings and threaded surfaces clean of particles and other foreign substances.
5. Verify the O-ring is in place on the module coupling.
Should additional O-rings be required, refer to
Table 4
.
6. Place the Liebert Flex Pipe assembly so that the flat face of the flange on the Liebert XD Flex Pipe
coupling comes into contact with the O-ring on the module coupling.
7. Thread the coupling halves together by hand to ensure that the threads mate properly.
If a torque wrench is not available, continue with the steps below.
8. Hold the Liebert XD Flex Pipe so that is does not rotate and use the torque wrench to tighten the
union nut to the proper value shown in
Table 3
.
9. Tighten the union nut on the Liebert XD Flex Pipe to the coupling on the module with the
adjustable wrench until a definite resistance is felt.
10. Use a marker or pen to draw a line lengthwise across the module coupling to the Liebert XD Flex
Pipe. The line should parallel the Liebert XD Flex Pipe.
11. Tighten the nuts an additional quarter-turn, judging the amount by the mark drawn in
Step 10
.
Table 3
Torque and wrench sizes for connecting Liebert Flex Pipe to the Liebert XDR with
removable couplings
Coupling
Size, in.
Wrench Size, in.
(mm)
Torque, Union Nut
Only, ft-lb (Nm)
Union Nut
1/2 (Supply)
15/16 (24)
40 (55)
1 (Return)
1-5/8 (41)
110 (150)
TOP VIEW
(Rear of Cabinet)
23-1/2" (597mm)
1-5/16"
(33mm)
Refrigerant
Return Line
Schrader Valve
Refrigerant
Supply Line
1-1/2"
(38mm)
7/8"
(22mm)
6-1/2"
(165mm)
2-1/8"
(54mm)
5-7/8"
(149mm)
Содержание Liebert XDR
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