Measure the content of O
2
/CO
2
in the flue gas using the measuring
equipment. Compare this with the control value.
10.3.6 Checking the automatic air vent
Check that the boiler pump venting valve is working. In the event of a leak,
replace the valve.
10.3.7 Cleaning the siphon
Measure the O
2
/CO
2
contents and the temperature of the flue gases at the
flue gas measuring point. To do this, proceed as follows:
Heat the water in the boiler to a temperature of approx. 70°C.
Unscrew the plug of the flue gas measurement point (exhaust system
adaptor).
The front panel must be removed to extract the siphon (A). Proceed as
described below:
Lower the panel (1);
Remove the clip (2);
Unfasten the pipe from the heat exchanger (3);
Remove the siphon (4) and clean it;
Replace, if necessary, all the gaskets present;
Fill the siphon with water and reposition it in its seat (5).
BO-0000208
Fig.
72
Dismantling the siphon
A
2
4
1
5
10.3.
2
Checking the water pressure
In order for the boiler to operate correctly, the pressure of the water in the
heating circuit, shown on the
display, must be between 1.0 and 1.5
bar. If necessary, restore the water pressure as described in the chapter
entitled "Filling the installation".
10.3.
3
Checking the expansion vessel
Check the expansion vessel and replace it if necessary. Check its
pre-charge every year and restore the pressure to 1 bar if necessary.
10.3.
4
Checking the flue gas discharge and the air supply
Check the entire line of flue gas pipes, in particular the tightness of the
flue gas evacuation and combustion air intake connections.
10.3.
5
Checking the combustion
10 Maintenance
6
6
Combi 2
3
