Emerson XDR user manual Hex body, union nut on one-shot coupling

Piping

Figure 20 Hex body, union nut on one-shot coupling

Union Nut Hex Body

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.

Table 2 Torque and wrench size for connecting Liebert XDR with one-shot couplings to Liebert XD Flex Pipe

Coupling	Wrench Sizes,	Torque, Union Nut
	in. (mm)
Size		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)

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.

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