Filling The System - Wolf CGB-75 Installation And Technical Manual

Fill the system and vent it properly to safeguard the perfect
functioning of the condensing boiler.
Before connecting the gas condensing boiler,
NB
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 closed
- The locking cap on the quick-acting air vent valve should
not be undone
- Open all radiator valves
- Open the return valves, and the heat exchanger will then be
filled steadily with water from below
- With the entire heating system and boiler in a cold condition,
slowly fill the system via the inspection/BDF valve at the
return until 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 signal ring
(status display) constantly green)
- Vent the pump; for 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
- When the system pressure drops below 1.5 bar, top up the
water
- Open the gas ball valve
- Press the reset button
Note: - In constant mode, the heating circuit is
automatically vented via the air vent valve.
- At a system pressure below 1.0 bar, the boiler
will enter a fault state
- Fill siphon with water and fit it to the boiler
22

Filling the system

ON/OFF switch Reset button
Automatic air vent valve
Air vent valve, heating
circuit pump
BDF valve
Siphon
Thermometer
30 62 555_0709