9
Filling the heating system
!
Please note
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 it with water.
■ Only use fill water of potable quality.
■ Soften fill water with a water hardness in excess of the following values, e.g.
with a small softening system for heating water (see the Viessmann Vitoset
pricelist):
– Vitodens 200-W to 45 kW: 16.8 °dH (3.0 mol/m
3
)
– Vitodens 200-W from 60 kW and multi-boiler systems: 11.2 °dH
(2.0 mol/m
3
)
■ An antifreeze additive suitable for heating systems can be added to the fill
water. The antifreeze manufacturer must verify its suitability.
A
1.
Check the pre-charge pressure of the
diaphragm expansion vessel.
2.
Close the gas shut-off valve.
3.
Fill the heating system at the boiler
drain & fill valve
A
(on the connec-
tion set, accessories or on-site). Min-
imum system pressure > 1.0 bar.
4.
Close boiler drain & fill valve
A
.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5692 843 GB
