2.
Fill the heating system via the boil-
er fill & drain valve
A
in the heat-
ing return (at the connection set or
on site). (Minimum system pres-
sure 0.8 bar).
Note
If the control unit has not been
switched ON prior to filling the sys-
tem, then the servomotor of the
diverter valve will still be in its cen-
tral position, and the system will be
completely filled.
3.
If the control unit had already been
switched ON before filling began:
Switch ON the control unit and acti-
vate the fill program via coding
address "2F:2".
Note
To call up code 1 and for setting the
coding address, see page 43.
4.
Close boiler fill & drain valve
A
.
5.
Close the shut-off valves on the
heating water side.
Venting the boiler
1.
Close the shut-off valves on the
heating water side.
2.
Connect the drain hose on valve
A
with a drain.
3.
Open valve
A
and the fill valve in
the heating return and vent using
mains pressure until no more air
noise can be heard.
4.
Close valve
A
and the fill valve in
the heating return, and open the
shut-off valves on the heating water
side.
Note
If required, also vent at tap
B
during
DHW heating.
Venting the heating system
1.
Start the control unit.
Further details regarding the individual steps
(cont.)
8
Commissioning, inspection, maintenance
5692
779
GB
Summary of Contents for VITOLADENS333-F
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