34
Venting the boiler
B
A
1.
Close the shut-off valves on the heat-
ing water side.
2.
Connect the supply hose to boiler
drain & fill valve
A
.
3.
Plug the drain hose onto top tap
B
and connect to a drain.
4.
Open taps
A
and
B
and vent at
mains pressure (purge) until no
sound of escaping air can be heard
and no more air bubbles are visible.
5.
Close taps
A
and
B
, open the shut-
off valves on the heating water side.
6.
Remove hoses again.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5623 520 GB
