Filling The System - Wolf CGB-11 Installation Instructions Manual

Fill the system and vent it properly, to safeguard the perfect
function of the gas fired condensing boiler.
Before connecting the gas fired condensing boiler
NB
to the heating system, flush the entire system to
remove residues such as welding pearls, hemp,
putty, etc. from the pipework.
• With the boiler in a cold condition, fill the heating system
slowly via the return, until 1.5 bar pressure is indicated.
Inhibitors are not permissible.
• Check the entire system for water leaks.
• Fill the condensate siphon with water.
• Close the gas tap.
• Open the manual air vent valve.
• Open the cap of the automatic air-vent valve (on the hea-
ting circuit pump) by one revolution, but do not remove the
cap.
• Open all radiator valves. Open all flow and return valves on
the gas fired condensing boiler.
• Fill the system to 1.5 bar pressure. In operation, the pressure
gauge must indicate between 1.5 and 2.5 bar.
• Start the gas fired condensing boiler, set the heating water
temperature selector into position „2" (pump running, illumi-
nated ring (status display) constantly green).
• Vent the pump; for this, briefly open and then retighten the
air vent screw..
• Vent the heating circuit; for this, switch the condensing boiler
several times ON and OFF.
• Top up with water when the system pressure drops seve-
rely.
Close the manual air vent valve.
NB
• Open the gas shut-off valve.
• Press the reset button.
Note: In constant operation, the heating circuit will be auto-
matically vented via the heating circuit pump.
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Filling the system

Fig.: Control unit overview
Fig.: Manual air vent valve
Fig.: Automatic air vent valve on the heating circuit pump
ON/OFF switch Reset button
Slightly crack open the manual air vent valve
Thermomanometer
Cap of the autom.
air vent valve
Air vent screw
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