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6.
Settings
6.1
Setting the combustion assembly
The burner is equipped with a lever that changes the position of the brake
plate in the combustion head. This is used to set the correct pressure
drop across the combustion assembly and thereby obtain good
combustion without ripples.
Make the adjustment by turning screw X.
The best position is, among other things, dependent on the input
power and overpressure in the boiler.
A general rule of thumb is that the smaller the capacity, the smaller
the gap should be between the brake plate and the combustion
assembly.
The position of the brake plate also has an impact on the quantity of air
supplied for combustion. This means that once the brake plate has been
adjusted, the combustion should be checked and, if necessary, the setting of
the air damper adjusted to obtain good combustion.
A left turn opens the brake plate, providing a lower pressure drop and more air
to the combustion process.
A right turn closes the brake plate, providing a higher pressure drop and less
air to the combustion process.
6.2
Startup
After the burner has been mounted on the boiler and the electrical connection,
de-aeration and tightness control have been performed, the burner is ready to
start-up.
Read the sections dealing with settings of gas valve, damper motor and
combustion device before start-up.
Open the ball valve and turn on the main switch, start the burner and begin
setting up the system.
6.3
Control of combustion
Check combustion using fl ue gas analysis instruments. Set the burner to about
20% excess air and check that good combustion is obtained. Check the actual
gas fl ow on the gas meter to ensure that the correct input power is achieved.
Recommended air excess at basic setting
Excess air fl ue gases
Gas quality
% O
2
Natural gas
3 - 5
Propane
3 - 5
Butane
3 - 5
Liquefi ed
3 - 5
petroleum gas
Biogas
3 - 5
Max % CO
% CO
Lambda 1.2
2
≈10
11.9
≈11.5
13.9
≈11.5
14.1
≈11
13.8
X
2
172 515 32-2 2022-09-28
21
Bentone
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