Filling The System - Wolf CGB-75 Installation And Operating Instructions Manual

Fill the system and vent it properly to safeguard the perfect
functioning of the condensing boiler.
Before connecting the gas condensing boiler,
Note
flush the heating system to remove residues
such as welding pearls, hemp, putty, etc. from
the pipework. Check the dirt filter.
- The gas tap must be shut
- The locking cap on the quick-acting air vent valve should
not be unscrewed
- Open all radiator valves
- Open the return valves, and the heat exchanger will then be
gradually filled with water from below
- With the entire heating system and boiler in a cold condition,
slowly fill the system via the inspection/BDF valve on the
return until approx. 2 bar pressure is indicated
- Open the flow valves on the condensing boiler
- Fill the heating system to 2 bar pressure In operation, the pressure
gauge (on site) must indicate between 1.5 and 2.5 bar
- Check the entire system for water leaks
- Open the air vent valve
- Start the condensing boiler, set the heating water temperature
selector to position "2" (pump running, illuminated indicator
ring for status display constantly green)
- Vent the pump; to do this, briefly open and then retighten
the air vent screw.
- Vent the heating circuit completely, switching the condensing
boiler ON for 5 seconds and OFF for 5 seconds at the ON/
OFF switch, five times in succession
- Top up with water (technical information) if the system pres-
sure falls below 1.5 bar
- Open the gas ball valve
- Press reset.
Note: - In continuous mode, the heating circuit is auto-
matically vented via the air vent valve
- At a system pressure below 1.0 bar, the boiler
will enter a fault state
- Fill the trap with water and fit it to the boiler
28
13. Filling the system
ON/OFF switch Reset button
Automatic air vent valve
Air vent valve, heating
circuit pump
Drain & fill valve
Trap
Thermometer
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