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Commissioning, inspection, maintenance
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.
Venting the heating system
Fig. 27
1. Check whether the air vent screw in quick-action
air vent valve
of the heating circuit pump is
A
open.
2. Close the gas shut-off valve. Switch the appliance
on.
Activating the venting function
Tap the following buttons:
1.
2. "Service"
3. Enter password "viservice".
36
on the heating water side.
B
and fill valve
in the heat-
A
A
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.
3. Activate venting function (see following steps).
4. Call up the pressure display with "System over-
view".
Check the system pressure.
4. Use
to confirm.
5. "Service functions"
6. "Air vent valve"
and fill valve
A
. At the
1.0 bar
>
on the heating water side.
and
C
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