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Fill the system and vent it properly to safeguard
the perfect boiler function.
Before connecting the boiler to the
heating system, flush the entire
system to remove residues such as
welding pearls, hemp, putty, etc.
from the pipework.
The boiler and central heating
system may only be filled, if a type-
tested safety valve (opening
pressure max. 3 bar) has been
installed.
• Connect a water hose to the filling/drain
valve (on-site).
• Open the cap of the quick-action air-vent
valve of the safety assembly (accessory) by
one revolution, but do not remove the cap.
• With the boiler in a cold condition, fill the
heating system slowly via the fill and drain
valve, until 1 bar pressure is indicated.
Inhibitors are not permissible.
Filling the heating system
Filling the heating system
Connection for venting
and safety flow
Filling
Note
Boiler fill and drain valve
Hose connection
Automatic air-vent valve
Locking cap
Automatic air-vent
valve
Note
