Further Details Regarding The Individual Steps; Removing The Front Panels; Filling The Heating System - Viessmann FB2A Installation And Service Instructions For Contractors

Commissioning, inspection, maintenance

Further details regarding the individual steps

Removing the front panels

See page 10, 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 300ppm (3.0 mmol/l), e.g. use a
small softening system for heating water (see Vitoset price list).
■ An antifreeze additive suitable for heating systems can be mixed with 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.
24
3. Fill heating system via boiler fill &
drain valve A in the heating return
(at the connection set on the side or
above the boiler). (Minimum system
pressure > 1.0 bar).