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25. Filling the heating system/trap
Filling the heating system
To ensure correct function of the condensing boiler, fill
the system as instructed, vent it completely and fill the
trap.
We recommend using a sludge separator with integral
magnetite separator in the heating appliance inlet to
protect the high efficiency pump and the appliance.
This is particularly relevant for old systems and mixed
installations.
Before connecting the heating system, flush it
to remove residues such as weld beads, hemp,
putty, etc. from the pipework. Check the dirt
filter.
• The gas condensing boiler must be off.
Close the gas ball valve.
• Open the cap of the automatic air vent valve on the
high efficiency pump by one revolution.
• Open all radiator valves.
Open the flow and return valves on the boiler.
• Slowly fill the entire heating system and boiler in a cold
condition to approx. 2 bar via the return.
Inhibitors and antifreeze are not permitted.
• Bleed all radiators with a bleed key and if the system
pressure drops significantly, top up with water to 2 bar.
• Check the entire system and all component unions
for water leaks.
If leak tightness cannot be ensured, there is a
risk of water damage.
• Switch ON the condensing boiler at the red ON/OFF
switch in the WOLF logo (pump will run).
• Briefly open the manual air vent valve until all air has
escaped and then close it again.
Please
note
Please
note
Fig.: Automatic air vent valve on the heating circuit pump
Bild: Heizkreispumpe
Automatic
air vent valve
Fig.: Gas connection: Risk of poisoning or explosion in the event of
gas escaping
Shut-off valve,
flow
Shut-off valve,
return
Gas ball valve
Fig.: Manual air vent valve
Slightly open the
manual air vent valve
Pressure gauge
Fig.: Pressure gauge
