Venting The Boiler - Viessmann VITODENS 222-F Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Filling the heating system
3. Connect the fill hose to boiler drain & fill valve
in the heating flow. Either on the side or top of the
boiler depending on the connection set.
4. Open shut-off valves
5. Fit hose to air vent valve
suitable container or drain outlet.
6. Activate the filling function (see commissioning
assistant or following chapter).
Activating the filling function
If the filling function is to be activated after commis-
sioning.
Tap the following buttons:
1. and OK – press simultaneously for approx. 4 s,
then release.
2. Use / to select "Basic settings".
3. OK

Venting the boiler

!
Please note
To prevent appliance damage,
Do not vent the boiler via the safety valve on the
heating water side.
1. Close shut-off valves
2. Open air vent valve
C
ing flow. Vent (flush) under mains pressure until no
more air noise is audible.
32
(cont.)
A
on the heating water side.
B
. Route the hose into a
C
on the heating water side.
B
and fill valve in the heat-
A
7. Fill the heating system via boiler drain & fill valve
A . Minimum system pressure
Check the system pressure at pressure gauge
Indicator must be in the green band.
Note
Close air vent valve
C
sure at boiler drain & fill valve
8. Close boiler drain & fill valve
4. Use / to select "Commissioning assistant".
5. OK
6. / for "Next" and OK until "Filling" appears.
7. OK
The filling function is activated. The display shows
the system pressure.
The filling function ends automatically after 20 min
or when you tap OK.
3. Close air vent valve
C
same time, adjust operating pressure
(0.1 MPa).
Note
Call up the pressure indicator in the "System
overview" menu point. See operating instructions.
4. Open shut-off valves
B
5. Remove drain hose from air vent valve
keep safe.
1.0 bar (0.1 MPa).
>
D
and adjust system pres-
.
A
.
A
and fill valve A . At the
1.0 bar
>
on the heating water side.
and
C
.