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5 Installation
Fig.199
1/4"
7
5
9
3
5.10.5
Testing the leak-tightness of the refrigerant connections
Fig.200
1
MW-1001650-3
5.10.6
Vacuum
Fig.201
1
Fig.202
6
168
4. Cut the refrigerant pipes coming from the indoor unit with a pipe cutter
A
5. Liquid line: use the new nut from the accessory bag.
6. Gas line: use the new nut from the accessory bag.
7. Flare the refrigerant pipes.
8. Apply refrigerant oil to the flared parts to facilitate tightening and
6
9. Tighten the connections, observing the given tightening torques.
9
3
MW-6020072-01
1. Remove the protective cap from the service connection on the stop
42 bar
2. Connect the pressure gauge and the nitrogen bottle to the service
3. Check the leak-tightness of the refrigerant connections on the indoor
2
4. Release the pressure and release the nitrogen.
Perform evacuation after checking that the refrigerant circuit is entirely free
of leaks. Evacuation is necessary to remove air and moisture from the
refrigerant circuit.
1. Connect the vacuum gauge and the vacuum pump to the service
2. Produce a vacuum in the indoor unit and the refrigerant connection
3. Check the pressure and the vacuum according to the
MW-1001651-3
4. Close the valve between the vacuum gauge / vacuum pump and the
5. Disconnect the vacuum gauge and the vacuum pump after it has shut
6. Refit the protective cap of the service connection. Torque load 14-18
MW-1001662-3
and deburr.
improve the seal.
Tab.103
External diameter of
External diameter of
the pipe (mm/inch)
the cone fitting (mm)
6.35 - 1/4
17
9.52 - 3/8
22
12.7 - 1/2
26
15.88 - 5/8
29
19.05 - 3/4
36
valve.
connection then progressively build up the pressure in the refrigerant
connection pipes and the indoor unit to 42 bar, in 5 bar increments.
and outdoor units, using a leak detector spray. If leaks appear, repair
the leak and repeat the steps 1 to 3 in order and check the leak-
tightness once again.
connection.
pipes.
recommendations table below. Refer also to local legislation.
Outdoor temperature °C
Vacuum pressure to
Pa
be reached
(bar)
Evacuation time after
reaching the vacuum
h
pressure
service connection.
down.
Nm.
Torque load (N.m)
14 - 18
34 - 42
49 - 61
69 - 82
100 - 120
≥ 20
10
0
1000
600
250
(0.01)
(0.006)
(0.0025)
1
1
2
7800871 - v01 - 18112021
- 10
200
(0.002)
3
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