31
Filling the heating system
Fill water
!
Please note
Unsuitable fill water increases
the level of deposits and corro-
sion and may lead to boiler dam-
age.
■ Flush the heating system thor-
oughly before filling.
■ Only use fill water of potable
quality.
■ Antifreeze suitable for heating
systems can be added to the fill
water. The antifreeze manufac-
turer must verify its suitability.
■ Fill and top-up water with a
water hardness in excess of
the following values must be
softened, e.g. with a small soft-
ening system for heating water.
Total permissible hardness of the fill and top-up water
Total heating
output
Specific system volume
kW
< 20 l/kW
≥ 20 l/kW to
< 50 l/kW
≥ 50 l/kW
≤ 50
≤ 3.0 mol/m
3
(16.8 °dH)
≤ 2.0 mol/m
3
(11.2 °dH)
< 0.02 mol/m
3
(0.11 °dH)
> 50 to ≤ 200
≤ 2.0 mol/m
3
(11.2 °dH)
≤ 1.5 mol/m
3
(8.4 °dH)
< 0.02 mol/m
3
(0.11 °dH)
> 200 to ≤ 600
≤ 1.5 mol/m
3
(8.4 °dH)
≤ 0.02 mol/m
3
(0.11 °dH)
< 0.02 mol/m
3
(0.11 °dH)
> 600
< 0.02 mol/m
3
(0.11 °dH)
< 0.02 mol/m
3
(0.11 °dH)
< 0.02 mol/m
3
(0.11 °dH)
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5585 174 GB
Service