Emerson Liebert XDR - Manual (Page 27)

Piping
21
Figure 20 Hex body, union nut on one-shot coupling
NOTICE
Risk of improper tightening. Can cause equipment damage.
It is imperative that the brass body on the Liebert XD Flex Pipe coupling does not rotate while
the union nut is being tightened. If the brass body rotates, it may damage the Liebert XD Flex
Pipe.
5. Hold the brass body of the Liebert XD Flex Pipe with a wrench so that it does not rotate and use
the torque wrench to tighten the union nut to the proper value shown in Table 2.
If a torque wrench is not available, continue with the steps below.
6. Tighten the union nut on the Liebert XD Flex Pipe to the coupling on the module with the proper-
sized wrench until a definite resistance is felt, metal-to-metal contact.
7. 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.
8. Tighten the nuts an additional one (1) wrench flat (60°), judging the amount by the mark drawn
in Step 7.
Table 2 Torque and wrench size for connecting Liebert XDR with one-shot couplings to
Liebert XD Flex Pipe
Coupling
Size
Wrench Sizes,
in. (mm) Torque, Union Nut
Only, ft-lb (Nm)
Union Nut
#10 (Supply) 1-5/16 (34) 35-45 (13.5-6.2)
#12 (Return) 1-3/8 (35) 50-60 (67.8-88.1)
Hex Body Union Nut