Start Up; Troubleshooting - Vaillant VA 6-050 MXNHDI Installation Manual

15 Preparation for Use
• Close the low valve on the combined meter, disconnect
the vacuum pump and close the vacuum valve.
• 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: repair
them (check the joints, joins, the indoor and outdoor
parts and the technical service faucets).
Fig. 15.4 Low pressure manometer reading with the low valve
closed: checking for leaks.
Warning!
Danger of malfunction and leaks.
Ensure that the service valves are closed.

15.3 Start up

Fig. 15.5 Filling the installation.
Legend
1 Two-way valve
2 Actuation faucet
• Open the two-way valve by twisting the rod 90º
anticlockwise and close it after 6 seconds. The
installation will be filled with coolant.
• Check the installation again for tightness:
• If there are leaks see section 15.4.
• If there are no leaks, continue.
• Remove the combined meter with the joining hoses
and faucets.
• Open the two and three-way valves by twisting the rod
anticlockwise as far as it will go.
32
Fig. 15.6 Opening of the two and three-way valves.
Legend
1 Two-way valve
2 Three-way valve
3 Actuation faucets
• Cover the two and three-way valves with the
corresponding protective covers.
Fig. 14.7 Protective covers.
Legend
1 Service hole lid
2 Two and three-way valve covers
• Connect the unit and run it for a few moments
checking that it carries out its functions correctly (for
more information see the user manual).

15.4 Troubleshooting

If the event of a gas leak, proceed as follows:
• Purge the installation removing the coolant by
pumping.
- You need a suction pump and a recycling bottle.
Warning!
Never dump coolant into the environment!
Coolant is a harmful product for the
environment.
• Check the flaring joins.
• Repair the leak, replace indoor and outdoor parts
which are not tight.
• Fill the unit with the correct amount of coolant using
coolant scales.
• Proceed to check for leakage as described above.
Multi Split Type Installation Manual