Hinweis
Additive combinations are permitted only if approved additive suppliers recom-
mend it and always according to supplier´s dosage recommendation.
It is essential that the procedure below is followed to ensure that all the air in the
boiler heat exchanger and the system is completely vented prior to firing the
appliance.
Filling the heating system
!
Achtung
Unsuitable fill water increases the level of deposits and corrosion and
may lead to boiler damage.
&
Thoroughly flush the entire heating system prior to filling with water.
&
Only use fill water of potable quality.
&
Soften fill water harder than 150 ppm temporary hardness.
&
Inhibitors or antifreeze additives suitable for heating systems should
be injected or added manually.
1. Close the gas shut-off valve.
2. Only when operating with DHW
cylinder: Prevent heat demand from
the DHW cylinder.
3. Switch on mains supply and turn
rotary selectors „tr“ and „tw“
counterclockwise to the end stop
(turn selector „tr“ only for system
boiler).
Hinweis
The display will show the actual
operating pressure and the circula-
tion pump is switched on.
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