12 Preparation For Use; Checking For Leaks; Evacuating The Installation - Vaillant VAM 3-050 W2N Manual De Instalación

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
• 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
VAI3-MWN-I_EN - 09/14 - Vaillant
12.2
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3
4
5
Fig. 12.2
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.
Fig. 12.3
• Close the valves on the service manifold and disconnect the
vacuum pump.
• Check the manometer needle after approximately 10-15
minutes have elapsed: the pressure should not rise. If it does
rise, there are leaks in the circuit. Please repeat the process
described on the section 12.1, Checking for leaks.

Evacuating the installation

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6
Evacuating the installation
Low pressure manometer reading with the low valve
open.
MAINTENANCE
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EN
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