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Start-up, calibration and operation of the burner
6.4 Gas pressure switch
6.5 Air pressure switch
The air pressure switch is set after all other adjustments have
been made. Begin with the switch at the start of the scale.
With the burner function at the required output, turn the knob
slowly in a clockwise direction until burner lockout.
Now turn the knob one notch anti-clockwise and repeat the burn-
er start-up to check everything is regular.
If the burner locks out again, turn the knob again by half a notch.
To calibrate the gas pressure switch, refer to the
gas train manual.
In conformity with the standard, the air pressure
switch must prevent the air pressure falling be-
low 80% of the adjusted value and the CO in the
flue gases exceeding 1% (10,000 ppm).
To check this, insert a combustion analyser in
the flue, slowly reduce the fan air setting (for ex-
ample with a piece of cardboard) and verify that
the burner locks out before the CO value in the
flue gases exceeds 1%.
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