Tab.26 Quantity of refrigerant fluid to be added
Length of refrigeration pipe
11 to 20 m
21 to 30 m
31 to 40 m
41 to 50 m
51 to 60 m
61 to 75 m
AWHP 6 MR-3
0.2 kg
0.4 kg
0.6 kg
not permit
ted
not permit
ted
not permit
ted
AWHP 8 MR-2
0.15 kg
0.3 kg
0.9 kg
not permit
ted
not permit
ted
not permit
ted
6.7.5
Testing the leak-tightness of the refrigerant connections
1. Remove the plugs from the stop valves A and B / C.
2. Check that A and B / C stop valves are closed.
3. Remove the plug from the service connection on A stop valve.
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 42 bar, in 5 bar
increments.
5. Check the leak-tightness of the fittings using a leak detector spray. If
leaks appear, repeat the steps in order and check the leak-tightness
once again.
6. Release the pressure and release the nitrogen.
6.7.6
Evacuation
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. Check that the A and B / C stop valves are closed.
2. Connect the vacuum gauge and the vacuum pump to the service
connection on A stop valve.
3. Produce a vacuum in the indoor module and the refrigerant
connection pipes.
4. Check the pressure according to the recommendations table below:
Tab.27
Outdoor temperature °C
≥ 20
10
0
- 10
Pressure to be
reached
Pa
(bar)
1000
(0.01)
600
(0.006)
250
(0.0025
)
200
(0.002)
Evacuation time after
reaching the pressure h
1
1
2
3
5. Close the valve between the vacuum gauge / vacuum pump and A
stop valve.
6. Disconnect the vacuum gauge and the vacuum pump after it has shut
down.
7. Open the valves.
Fig.34
MW-M002297-3
A
B
C
42 bar
1
1
1
2
2
2
5
3
4
Fig.35
MW-M002499-2
A
B
C
1
1
1
2
4
6 Installation
7762758 - v05 - 19082020
35
