32
12. GENERAL INSTRUCTION
12.3 Adjustment of air pressure switch
The air pressure switch should stop the burner, if the air volume is
reduced.
The air proving device shall be adjusted in such a way that if there is
insufficient air supply at the highest or lowest burner operating stage,
the device operates before the supervised pressure is less than 80% of
the pressure at the controlled stage and the CO content of the
combustion products exceeds 1% by volume.
On adjustment, turn the scale on the air pressure switch in clockwise
direction. When the switch-off point has been reached and the burner
stops read off the value on the scale. Then turn the scale in anti-
clockweise direstion to desired value. Make repeated start attempts to
ensure that the air pressure switch is not too closely set.
Adjustment range ca:
1-10 mbar LGW 10
2,5-50 mbar LGW 50
12.4 Adjustment of min. gas pressure switch
The min. pressure switch should react if the gas pressure is too low
and prevent the burner from starting. Too low a gas pressure during
operation should stop the burner. The burner may start again when the
rated gas pressure has been reached.
Remove the protective cover. Connect a pressure gauge for measuring
the rated pressure. Decide on pressure at which the gas switch should
switch off. Set this pressure by means of the valve. Carefully turn the
knob (see figure) until the gas pressure switch switches off. The value
shown on the scale should then approximately correspond with the
value shown on the pressure gauge. Tolerance on scale appr. ± 15 %.
Open the ball valve.
12.5 Adjustment of max. gas pressure switch
The burner is equipped with a max. gas pressure switch only on
request. It should stop the burner if the gas pressure exceeds the set
value. The burner can then only be re-started manually (gas burner
control or overpressure switch).
Remove the protective cover. Connect a pressure gauge for measuring
the rated gas pressure. Decide on pressure at which the gas pressure
switch should switch off. Turn the adjustment knob to this value.
Tolerance on the scale ±15%.
Adjustment range:
2,5-50 mbar GW 50
5-150 mbar GW 150
12.6 Gas pressure switch, air pressure switch
