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5.6.6
Vacuum
Fig.128
1
Fig.129
6
5.6.7
Opening the stop valves
Fig.130
2
Fig.131
4
5.6.8
Charging recommendations
7797831 - v04 - 07122022
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.
MW-1001651-3
MW-1001662-3
Once the leak-tightness has been checked and the refrigerant circuit
evacuated, open the stop valves to allow the refrigerant to circulate.
1
MW-1001652-3
3
MW-1001653-3
In addition to conventional charging procedures, the following
requirements shall be followed.
1. Connect the vacuum gauge and the vacuum pump to the service
connection.
2. Produce a vacuum in the indoor unit and the refrigerant connection
pipes.
3. Check the pressure and the vacuum according to the
recommendations table below. Refer also to local legislation.
Outdoor temperature °C
Vacuum pressure to
be reached
Evacuation time after
reaching the vacuum
pressure
4. Close the valve between the vacuum gauge / vacuum pump and the
service connection.
5. Disconnect the vacuum gauge and the vacuum pump after it has shut
down.
6. Refit the protective cap of the service connection. Torque load 14-18
Nm.
1. Open the valve on the liquid line with an Allen key by turning counter-
clockwise until it stops.
2. Put the protective cap back in place. Torque load 14-18 Nm.
3. Open the valve on the gas line with an Allen key by turning counter-
clockwise until it stops.
4. Put the protective cap back in place.
5. Depending on the length of the refrigerant pipes, it may be necessary
to add refrigerant.
Ensure that contamination of different refrigerants does not occur when
using charging equipment. Hoses or lines shall be as short as possible
to minimise the amount of refrigerant contained in them.
Cylinders shall be kept in an appropriate position according to the
instructions.
≥ 20
10
Pa
1000
600
(bar)
(0.01)
(0.006)
h
1
1
en
5 Installation
0
- 10
250
200
(0.0025)
(0.002)
2
3
123
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