Emerson XDR user manual Connection Methods-Removable Couplings

Piping

6.7.3Connection 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

1-5/16"		TOP VIEW		7/8"
		(Rear of Cabinet)
(33mm)			Refrigerant
	Refrigerant			(22mm)
	Return Line	Schrader Valve	Supply Line
1-1/2"				2-1/8"
(38mm)
				(54mm)
5-7/8"				6-1/2"
(149mm)
				(165mm)

23-1/2" (597mm)

6.7.4Connect 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.

Table 3 Torque and wrench sizes for connecting Liebert Flex Pipe to the Liebert XDR with removable couplings

Coupling	Wrench Size, in.	Torque, Union Nut
	(mm)
Size, in.		Only, ft-lb (Nm)
	Union Nut
1/2 (Supply)	15/16 (24)	40	(55)
1 (Return)	1-5/8 (41)	110	(150)

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.

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