18
Bentone
Gas quality
Excess air flue gases
Max % CO2
% O2
% CO2 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
Setting the air pressure switch
The air pressure switch must block the burner if the amount of air for
combustion becomes too low. The air pressure switch must be set so
that in the event of a lack of air supply at the burner’s max. or min.
capacity reacts before the monitored pressure drops so much that
poor combustion occurs.
1.
Remove protective cover.
Carefully turn the scale on the air pressure switch clockwise
until the air pressure switch stops the burner.
4.
Measure and note the lowest air pressure in the entire work
5.
Set the air pressure switch to about 10-15% lower than the
lowest noted pressure.
6.
7.
Refi t protective cover.
4.3 Start-up
After the burner has been fitted to the boiler, the electrical connection
is complete, the gas piping is seal tested and de-aerated, and the
electrical function test has been carried out, the burner is ready for
start-up.
Read the sections on setting of the gas valve, damper motor and
combustion device before starting.
Open the ball valve and switch on the main switch, start the burner
and start adjusting the system.
4.4 Adjustment
Check the combustion using flue gas analysis instruments. Set the
burner to about 20% excess air and check the flue gas temperature.
Calculate the combustion efficiency. Also check the current amount of
gas on the gas meter so that the correct applied power is achieved.
4.5 Recommended excess air when using
default setting
Summary of Contents for STG 146i/2
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