26
Removing the front panels
See page 11, steps 1 to 5.
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 hardness exceeding 300 ppm (3.0 mmol/l), e.g. with a
small softening system for heating water (see Vitoset pricelist).
■ An antifreeze additive suitable for heating systems can be added to the fill
water.
Shown with connection set for finished walls (accessory)
1.
Check the pre-charge pressure of the
diaphragm expansion vessel.
2.
Close the gas shut-off valve.
3.
Fill heating system via boiler drain &
fill valve
A
in the heating return
(depending on connection set either
on the side or above the boiler). (Min-
imum system pressure > 1.0 bar).
Commissioning, inspection, maintenance
Further details regarding the individual steps
5412 755 GB
