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3062880_0910
Filling the system / filling the siphon
Fill the system and vent it correctly in line with the details
in the chapter "Water treatment" to ensure the perfect
function of the condensing boiler (see page 30).
Before connecting the gas condensing boiler,
flush the heating system to remove residues
such as welding pearls, hemp, putty, etc. from
the pipework.
• The gas tap must be shut.
• Open the air vent valves.
• Open all heating circuits.
• Open all radiator or mixer valves.
• Slowly fill the entire heating system and boiler when
cold, for example via the BDF valve at the return, to
approx. 2 bar pressure.
Inhibitors are not permissible.
• Open the flow valves on the condensing boiler.
• Fill the heating system to 2 bar pressure. In operation,
the pressure gauge must indicate between 1.5 and
5.5 bar.
• Check the entire system for water leaks.
• Remove the siphon.
• Fill the siphon with water.
• Refit the siphon.
• Start the condensing boiler, set the heating water
selector to position "2" (pump running, illuminated
status indicator ring constantly green).
• Vent the heating circuit; for this, switch the gas
condensing boiler ON and OFF again several
times.
• Top up with water when the system pressure falls
substantially.
• Open the gas ball valve.
• Press the reset button.
NB
NB
Note:
In constant mode, the heating circuit is
automatically vented via the air vent valve
(accessory).
Fig.: Siphon
Siphon
Fig.: Control unit overview
ON/OFF switch
Thermometer
Reset button
Fig.: (BDF valve)
BDF valve
Water pressure switch
The condensate hose attached to the siphon
must not form a loop or roll up, otherwise the
operation might be impaired.
NB
