63
925.916.2 - GBINSTRUCTIONS PERTAINING TO THE INSTALLER
19. posItIonIng of the IgnItIon anD flame sensIng eleCtroDe
20.
CheCk of CombustIon parameters
Figure 16
010905_0200
To measure combustion performance and hygiene levels
of combustion products, the forced draught boiler models
are equipped with two test points on the tapered coupling
specically designed for this purpose.
One of the two test points is connected to the exhaust ue
duct to allow measurements of the combustion products
hygienic standards and combustion efciency.
The second test point is connected to the comburant
air inlet duct to check possible combustion products
circulation in case of coaxial ducts.
The exhaust ue duct test point allows measurements
of the following:
• combustion products temperature;
• concentration of oxygen (O
2
) or, alternatively, of carbon
dioxyde (CO
2
);
• concentration of carbon monoxyde (CO).
The comburant air temperature must be measured at the
test point connected to the air inlet duct.
Figure 17
020429_0300
flue gas
combustion air
gasket
WARNING: close the ue adaptor test point with the plug
after combustion test.
To facilitate measurement of the combustion efciency and
improve the cleanliness of the production products, the
ue-sweeper function can be activated by proceeding as
described below:
1) press the (2-3) together until the pointer “ ” appears
on the display alongside the symbol (about 3 seconds
but no more than 6 seconds). In these conditions, the
boiler operates at the maximum heat output set for central
heating.
2) press either of the buttons to exit the function
21. aCtIvatIng the flue-sweeper funCtIon
020429_0200
Figure 18
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