Filling Siphon With Water - Viessmann FB2A Installation And Service Instructions For Contractors

Further details regarding the individual steps
Note
For function and sequence of the
venting program, see page 113.
3. Check the system pressure.
Activating the venting function:
1. Press OK and
approx. 4 s.

Filling siphon with water

simultaneously for
Commissioning, inspection, maintenance
(cont.)
2. "Service functions"
3. "Air vent valve"
4. Ending venting function:
Press OK or .
1. Pivot control unit forward.
2. Pull retaining clip A off.
3. Pull filler pipe B upwards.
4. Pull off lute C downwards.
5. Fill siphon with water and reassem-
ble.
6. Refit cover panel.
7. Secure control unit back in operating
position.
27