13. Connect the pipes and tighten the nuts with a dynamometric span
ner.
Notice
Apply refrigerant oil to the beaded parts to facilitate tightening and
improve the seal.
A Do not use a spanner on this part of the valve, danger of the refrig
erant leaking
B Recommended position of the spanners for tightening the nut
Tab.21 Torque load
External diameter of
the pipe (mm/inch)
External diameter of
the cone fitting (mm)
Torque load (N.m)
6.35 - 1/4
17
14 - 18
9.52 - 3/8
22
34 - 42
12.7 - 1/2
26
49 - 61
15.88 - 5/8
29
69 - 82
7.4.3
Test the tightness
1. Open the plugs in isolation valves A and B / C.
2. Check that isolation valves A and B / C are closed.
3. Remove the plug from the service connection on isolation valve A.
4. Connect the pressure gauge and the nitrogen bottle to the stop
valve A then progressively build up the pressure in the refrigerant
connection pipes and the indoor module to 35 bar, in 5 bar incre
ments.
5. Check the tightness of the fittings using a leak detector spray. If
leaks appear, repeat the steps in order and check the tightness once
again.
6. Release the pressure and release the nitrogen.
Fig.50
Connecting the pipes
MW-M002211-1
13
A
B
B
Fig.51
Isolation valves
MW-M002297-2
A
B
C
35 bar
1
1
1
2
2
2
5
3
4
7 Installation
50
AWHP-2 iMPI
7685645 - v04 - 07032018
