Further Details Regarding The Individual Steps; Filling The Heating System - Viessmann Vitodens 300 Service Instructions Manual

Further details regarding the individual steps

Filling the heating system

Initial start-up, inspection, maintenance
1. Check the charge pressure of the
diaphragm expansion vessel.
2. Close the gas shut-off valve.
!
3. Important information
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 with water.
&
Only use fill water of pota-
ble quality.
&
Soften fill water harder
than 20 °dH (3.58 mmol/l).
For suitable means of
water softening, see the
Vitotec pricelist.
&
An anti-freeze additive sui-
table for heating systems
can be mixed with the fill
water.
Fill the heating system via the boi-
ler fill & drain valve A (minimum
system pressure > 0.8 bar).
4. Close the boiler fill & drain
valve A.
7