34
Fig. 29
1.
Close the shut-off valves on the heating water side.
2.
Remove front insulation shell
A
(if already fitted).
3.
Connect the drain hose on air vent valve
B
to a
drain.
4.
Open valves
B
and
C
and vent at mains pres-
sure until the sound of escaping air can no longer
be heard.
5.
Close valves
B
and
C
; open the shut-off valves
on the heating water side.
Venting the heating system
Commissioning, inspection, maintenance
Venting the boiler
6136330
