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2. Coaxial pipes: if necessary, check the return into circulation of any
combustion products. The sensor will then be connected to the outlet
connected to the combustion air intake circuit.
For more information, see
Using the fixed-speed boiler, page 91
CO2 checking and setting values, page 65
Checking combustion (reduced heat input), page 108
Setting the air/gas ratio (maximum heat input), page 61
Checking combustion (reduced heat input)
1. Check the combustion with reduced heat input.
2. Coaxial pipes: if necessary, check the return into circulation of any
combustion products. The sensor will then be connected to the outlet
connected to the combustion air intake circuit.
For more information, see
Using the fixed-speed boiler, page 91
CO2 checking and setting values, page 65
Setting the air/gas ratio (maximum heat input), page 61
Setting the air/gas ratio (reduced heat input), page 63
11.3 Replacing the 4 A fuses on the electrical terminal blocks
Danger of electric shock
Before any work, switch off the mains supply to the boiler.
1. Pivot the fuse-holder socket N towards you.
Fig.127
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Fig.128
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Fig.129
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11 Maintenance
108
IX
7702703 - v04 - 05092019