Vaillant VAI 3-025 WN Manual Del Usuario página 46

MAINTENANCE
Fig. 12.3 Low pressure manometer reading with the low valve
open.
• 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.
WARNING!
a
Do not proceed to the next step until a satisfactory
evacuation of the installation has been completed.
Fig. 12.4 Low pressure manometer reading with the low valve
closed: checking for leaks.
WARNING!
a
Danger of malfunction and leaks.
Ensure that the service valves on the outdoor unit are
closed.
- 20 -
12.3 Start up
Fig. 12.5 Filling the installation.
Legend
1 Two-way valve
2 Actuation faucet
• Open the two-way valve by twisting the allen key 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 12.4.
- If there are no leaks, continue.
• Remove the service manifold.
• Open the two and three-way service valves by twisting the
allen key anticlockwise as far as it will go.
1
1
3 3
Fig. 12.6 Opening of the two and three-way valves.
Legend
1 Three-way service valve
2 Allen key (not supplied) to open valves
3 Two-way shut off valve
• Seal the two and three-way service valves with the
corresponding protective covers.
1
1
2
2
2 2
VAI3-WN-I_EN - 07/14 - Vaillant