Wolf FGB-35 - Filling the Heating System

46
3064458_201811
Fig: Automatic air vent valve on the heating circuit pump
Automatic
air vent valve
Filling the heating system
To ensure correct function of the condensing boiler, ll
the system as instructed, vent it completely and ll the
trap.
We recommend using a sludge separator with integral
magnetite separator in the boiler inlet to protect the
high efciency pump and the boiler. This is particularly
relevant for old systems and mixed installations.
Before connecting it, ush the entire system
to remove residues such as weld beads,
hemp, putty, etc. from the pipework. Check
the dirt lter.
• 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 efciency pump by one revolution.
• Open all radiator valves.
Open the ow and return valves on the boiler.
• Slowly ll the entire heating system and gas
condensing boiler while cold up to approx. 2 bar via
the return line (external pressure gauge required).
Inhibitors and antifreeze are not permitted.
• Bleed all radiators and if the system pressure drops
signicantly, top up with water to reach 2 bar again.
• 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 power supply to the gas condensing
boiler AP indication on the display for the duration of
the venting program.
• Briey open the manual air vent valve on the ow
pipe until all air has escaped and then close it again.
Collect any water expelled.
Please note
Please note
18. Filling the heating system / trap
Fig: Manual air vent valve
Slightly open the
manual air vent valve