41
A
C
B
Fig. 31
1.
Close the shut-off valves on the heating water side.
2.
Remove cover panel
A
.
3.
Push the drain hose onto air vent valve
B
and con-
nect to a drain.
4.
Open air vent valve
B
and fill valve
C
in the heat-
ing return and vent (flush) using mains pressure
until no more air noise can be heard.
5.
First close air vent valve
B
.
6.
When the required operating pressure has built up,
close fill valve
C
. Open the shut-off valves on the
heating water side.
7.
Remove the drain hose from air vent valve
B
and
retain.
Venting the heating system
A
Fig. 32
1.
Close the gas shut-off valve and switch the control
unit ON.
2.
Check whether the air vent screw in quick-action air
vent valve
A
of the heating circuit pump is open.
3.
Activate venting program (see next chapter).
Note
For function and sequence of the venting program,
see page 119.
Commissioning, inspection, maintenance
Venting the boiler
5773 238 GB
