20181270 CR v8-2019Page 42
Refrigerant connection
Torque load
External diameter of the pipe
(mm/inch)
External diameter of the cone
fitting (mm)
Torque load (N.m)
Ø 6.35
– 1/4
17
14 - 18
Ø 9.52
– 3/8
22
34 - 42
Ø 12.7
– 1/2
26
49 - 61
Ø 15.88
– 5/8
29
69 - 82
Leak test
-
Check that the valve on the outdoor unit closes.
-
Connect the pressure gauge and the nitrogen canister to the Schrader type valve, then gradually pressurise
the refrigerant connection pipes and the indoor module to 35 bar, in 5 bar increments.
-
Check the leak-tightness of all the connections using a leak detector aerosol. If leaks occur, repeat the steps
in order and check the leak-tightness again.
-
Release the pressure and discharge the nitrogen.
Creating a vacuum
-
Check that the stop valve is closed.
-
Connect the vacuum gauge and the vacuum pump to the valve's service connector.
-
Create the vacuum in the indoor module and the refrigerant connection pipes.
-
Check the pressure against the recommendation table below:
Outdoor temperature
°C
>20
10
0
-10
Absolute pressure target
Pa
1000
600
250
200
bar
0.01
0.006
0.0025
0.002
Vacuum creation time once the
target pressure has been
reached
hour 1
1
2
3
-
Close the valve between the vacuum gauge/vacuum pump and the stop valve.
-
Open the valves immediately after switching off the vacuum pump.
Indoor unit
Taper nut
Pipe
Torque wrenches
Connection
Wrenches
Outdoor unit
Liquid pipe
Gas pipe
Torque wrenches
