Note
Additive combinations are permitted only if approsed additive suppliers recom-
mend it and always according to supplier´s dosage recommendation.
Filling the heating system
!
Important information
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
"
counter clockwise to the end stop.
Note
The display will show the actual
operating pressure, will position the
three-way valve in the centre and
the circulation pump is switched on
in cycles.
Commissioning and testing
(cont.)
48
Installation
58
62
670
GB
