Filling/Draining The Heating System - Wolf COB Technical Manual And Installation Instructions

Air vent valve
Fig.: Venting the COB
26
19 Filling/draining the heating system
Filling the heating system
Note
- Open the cap on the vent in the boiler by one revolution.
- Open all radiator valves.
- Fill the system via the return line at 2 bar (1.5 to 2.5 bar).
- With the entire heating system and boiler in a cold condition,
slowly via the inspection/BDF valve at the return until 2 bar
pressure is indicated.
- Check the entire system for water leaks.
- Start the boiler, set the heating water temperature to position
"2" (pump running, illuminated signal ring (as status indicator)
constantly green).
- Vent the pump; for this, briefly open and then retighten the air
vent screw.
- Vent the heating circuit completely, switching the boiler ON
for 5 sec. and OFF for 5 seconds at the ON/OFF switch, five
times in succession.
- When the system pressure drops below 1.5 bar, top up the
water.
Draining the heating system
- Open drain valve (BDF valve) on the boiler, for example.
- Open the air vent valves on the radiators.
- Drain off the heating water
Fill the system and vent it properly to ensure
perfect boiler function.
Before connecting the boiler, flush the heating
system to remove residues such as welding pearls,
hemp, putty, etc. from the pipework.
Switch off installation (see operating
instructions) and let cool to a max. of 40°C,
there is a risk of scalding otherwise.
Secure the heating system against restarting,
otherwise there is a risk of electrocution.
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