30
A
B
C
Fig. 22
1.
Close the shut-off valves on the heating water side.
2.
Note
Only carry out the following tasks with the control
unit switched off.
Pivot the control unit down.
3.
Remove cover panel
A
.
4.
Push the drain hose onto air vent valve
B
and
connect to a drain.
5.
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.
6.
First close air vent valve
B
.
7.
When the required operating pressure has built up,
close fill valve
C
. Open the shut-off valves on the
heating water side.
8.
Remove the drain hose from air vent valve
B
and
retain.
Filling the trap with water
A
B
C
D
Fig. 23
1.
Disconnect condensate hose
A
from the trap.
2.
Turn internal pipe
B
and pull upwards.
Commissioning, inspection, maintenance
Venting the boiler
5778741
