Venting the boiler
1.
Close the shut-off valves on the
heating water side.
2.
Connect the drain hose between
top valve
B
and a drain outlet.
3.
Open valves
A
and
B
, and vent
at mains pressure until no sound of
escaping air can be heard.
4.
Close valves
A
and
B
and open
the heating water shut-off valves.
Venting the heating system
1.
Close the gas shut-off valve and
switch ON the control unit.
Further details regarding the individual steps
(cont.)
8
Commissioning, inspection, maintenance
5692
673
GB
Summary of Contents for VITODENS 300-W
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