Preparation For Use; Checking For Leaks; Evacuating The Installation - Vaillant VAI 6-025 WN Installation Manual

12 Preparation For Use

12.1

Checking for leaks

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6
Fig. 12.1 Checking for leaks in the installation.
Legend
1 Suction valve (gas)
2 Return valve (liquid)
3 Service manifold
4 Non-return valve
5 Oxygen free Nitrogen cylinder
6 Gauge lines
• Connect a service manifold set to the service port on the
gas line stop valve of the outdoor unit.
• Connect a oxygen free nitrogen cylinder to the charging
hose of the refrigerant gauges.
• Carefully open the valves on the service manifold to allow
the oxygen free nitrogen to enter the installation. Set it
to 40 bars pressure for 10/20 minutes. Do not open the
service valve on the outdoor unit as this will release the
pre�charged refrigerant from the outdoor unit.
• Check that all the connections and joints are gastight. If
any leaks are found, repair and start the process again
from the beginning.
• On satisfactory completion of the test, close all the valves
on the combined meter and remove the oxygen free
nitrogen cylinder.
• Release the pressure from the system by slowly opening
the valves on the service manifold.
• Do not continue to the next step until the pressure test
has been successfully completed.
According to Regulation 842/2006/EC, the complete
refrigerant circuit must be periodically checked for
leakage. Take the necessary actions to ensure these tests
are performed and the results correctly logged into the
maintenance record of the machine. The leakage test must
be done with the following frequency:
• Systems with less than 3 kg of refrigerant => periodic
leakage test not needed
VAI 6 WN-I_EN - 06/14 - Vaillant
• Systems with 3 kg or more of refrigerant => at least once
every 12 months
• Systems with 30 kg or more of refrigerant => at least once
every 6 months
• Systems with 300 kg or more of refrigerant => at least
once every 3 months
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12.2

Evacuating the installation

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4
1
5
6
Fig. 12.2 Evacuating the installation
Legend
1 Suction valve (gas)
2 Return valve (liquid)
3 Service manifold
4 Non-return joint
5 Vacuum pump suitable for refrigeration systems
6 Gauge lines
• Connect a service manifold to the three�way valve on the
gas line of the outdoor unit.
• Connect a vacuum pump to the charging connection of
the service manifold.
• Ensure that the the service manifold valves are closed.
• Turn the vacuum pump on and open the service manifold
shut off valve to open the system to the vacuum pump.
• Ensure that all other valves are closed.
• Leave the vacuum pump functioning for approximately 15
minutes (depending on the size of the installation) to carry
out the vacuum.
• Check the needle on the low pressure manometer: it
should indicate �0.1 MPa (�76 cmHg � >3 Torr). If the
service manifold gauge is not capable of measuring to
these pressures a separate Torr gauge should be fitted in
line to measure this pressure.
MAINTENANCE
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EN
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