Connecting The Refrigerant Connections To The Outdoor Unit; Testing The Leak-Tightness Of The Refrigerant Connections; Vacuum - Baxi HSGNW25 Installation And Service Manual

5.6.4

Connecting the refrigerant connections to the outdoor unit

Fig.122
Fig.123
1/4"
7
5
9
3
5.6.5

Testing the leak-tightness of the refrigerant connections

Fig.124
1
MW-1001650-3
5.6.6

Vacuum

7798815 - v04 - 07122022
10. Tighten the connections, observing the given tightening torques.
1. Remove the protective side panel from the outdoor unit.
2. Check that the stop valves are closed.
3. Remove the protective caps from the valves and throw them away.
MW-1001648-1
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
2. Connect the pressure gauge and the nitrogen bottle to the service
42 bar
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.
Tab.102
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
Caution
Use a second wrench to prevent the refrigeration link from
twisting.
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.
en
5 Installation
Torque load (N.m)
14 - 18
34 - 42
49 - 61
69 - 82
100 - 120
Torque load (N.m)
14 - 18
34 - 42
49 - 61
69 - 82
100 - 120
127