Operating instructions

23
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 3.0 mmol/l e.g. by means of a
small softening system for heating water (see Vitoset price list).
■ 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 (at
the connection set on the side or
above the boiler). (Minimum system
pressure > 1.0 bar).
Commissioning, inspection, maintenance
Further details regarding the individual steps
5457 552 GB
Service