Preparation For Use; Checking For Leaks; Purging The Installation - Vaillant VA 6-050 MXNHDI Installation Manual

15 Preparation for Use

This consists of the following steps:

• Checking for Leaks.

• Purging the installation.

• Start up.
• Troubleshooting.
15.1 Checking for leaks
Fig. 15.1 Checking for leaks in the installation.
Legend
1 Suction valve (gas)
2 Return valve (liquid)
3 Combined meter
4 Non-return joint
5 Pipes for coolant
6 Nitrogen cylinder
• Connect a combined meter (faucets) to the three-way
valve in the suction hose.
• Connect a nitrogen cylinder to the low-pressure end of
the combined meter.
• Carefully open the valves corresponding to the faucets
and pressurise the system.
• In the event of using R-407C coolant set it to 28.5
bar(g) of pressure, for 10 min.
• In the event of using R-410A coolant set it to 40
bar(g) of pressure, for 10/20 min.
• Check that all the connections and joints are watertight.
• Close all the valves on the combined meter and
remove the nitrogen cylinder.
• Release the pressure from the system by slowly
opening the faucets.
• In the event of detecting leaks, repair them and repeat the test.
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
Multi Split Type Installation Manual
Preparation for Use 15
• 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
15.2 Purging the Installation
Fig. 15.2 Purging the installation.
Legend
1 Suction valve (gas)
2 Return valve (liquid)
3 Combined meter
4 Non-return joint
5 Pipes for coolant
6 Vacuum pump for coolant
• Connect a combined meter (faucets) to the three-way
valve in the suction hose.
• Connect a vacuum pump to the low-pressure end of
the combined meter.
• Ensure that the faucets are closed.
• Turn the vacuum pump on and open the vacuum valve,
the low valve on the combined meter and the gas faucet.
• Ensure that the high valve is 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).
Fig. 15.3 Low pressure manometer reading with the low valve open.
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