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Further details regarding the individual steps
Filling the heating system
Initial start-up, inspection, maintenance
1. Check the inlet pressure of the dia-
phragm expansion vessel.
!
2.
Please note
Unsuitable fill water
increases the level of depos-
its and corrosion and may
lead to boiler damage.
Thoroughly flush the entire
heating system prior to fill-
ing it with water.
Only use fill water of pota-
ble quality.
Soften fill water harder
than 3.58 mmol/l.
An anti-freeze additive sui-
table for heating systems
can be added to the fill
water.
Drain the heating system via boiler
fill & drain valve A. (minimum sys-
tem pressure > 0.8 bar).
Note
If the control unit has not been
switched ON prior to filling the sys-
tem, then the servomotor of the
changeover valve will still be in its
central position, and the system will
be completely filled.
3. If the control unit had already been
switched ON before filling began:
Start the control unit and in code 1,
set coding address "2F:2" (see
page 38).
The display shows "Filling"
The diverter valve is in its central
position.
7
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