Wolf CGB-2 Series Installation Instructions For Contractors page 54

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 boiler inlet to protect the
high efficiency pump and the boiler. This is particularly
relevant for old systems and mixed installations.
Before connecting it, flush the entire system to
Please
remove residues such as weld beads, hemp,
note
putty, etc. from the pipework. Check the dirt
filter.
• The gas condensing boiler must be switched 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 appliance in
a cold condition to approx. 2 bar via the return.
Never use inhibitors or antifreeze.
Please
note
• 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.
54
25. Filling the heating system/trap
Fig: Gas connection: Risk of poisoning or explosion in the event of
gas escaping
Fig: Automatic air vent valve on the heating circuit pump
Fig: Pressure gauge
Fig: Manual air vent valve
Shut-off valve Gas ball valve
(flow)
Automatic
air vent valve
Pressure gauge
Shut-off valve
(return)
Bild: Heizkreispumpe
Slightly open the
manual air vent valve
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