42
Bentone BG550/650
General
Gas pressure switch, air pressure switch
11.5 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
insuficient 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
11.6 Adjustment of min. gas pressure
switch (option)
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
igure) 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.
11.7 Adjustment of max. gas pressure
switch (option)
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
