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

Filling the heating system
Fill the system and vent it properly to ensure
perfect boiler function.
Before connecting the boiler, flush the heating
NB
system to remove residues such as welding
pearls, hemp, putty, etc. from the pipework.
- 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, fill slowly via the inspection/fill & drain 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 seconds 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.
Checking the position of the displacement device
The displacement device may have slipped during
transport.
To ensure perfect combustion, check the
displacement device is correctly positioned before
commissioning the appliance.
- Unplug the central connector.
- Loosen the three 6 mm Allen screws on the burner flange
(do not unscrew them completely).
- Rotate the burner unit approx. 1 cm to the right
(clockwise).
- Lift the burner unit upwards out of the combustion
chamber lid and hang in place in the maintenance
position, as shown in the figure.
- Undo the wing screws on the combustion chamber lid.
- Lift off the combustion chamber lid and place to one side.
- Measure the distance between the upper edge of the top
displacement device and the upper end of the ridged profile,
then compare with the table below.
Displacement COB-15 COB-20 COB-29 COB-40
device distance to
98-103
ridged profile (mm)
- Assembly is carried out in reverse order.
20
15. Filling the heating system
98-103 123-128 123-125
Air vent valve
Diagram: Venting the COB
Unplug the
central connector
Burner in the
maintenance position
Displacement device
distance
Diagram: View of COB displacement device
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