21
Bentone
Gas quality
Excess air flue gases
Max % CO
2
% O
2
% CO
2
Lambda 1.2
Natural gas
3 - 5
≈
10
11.9
Propane
3 - 5
≈
11.5
13.9
Butane
3 - 5
≈
11.5
14.1
Liquefied
petroleum gas
3 - 5
≈
11
13.8
Biogas
3 - 5
6.3
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.
6.4
Control of combustion
Check combustion using flue gas analysis instruments. Set the burner to about
20% excess air and check that good combustion is obtained. Check the actual
gas flow on the gas meter to ensure that the correct input power is achieved.
Recommended air excess at basic setting
