7
E. .02.1999 • G. 04.04.24
The air valve positioning motor SQN
The air valve positioning motor adjusts the air valve po-
sition or trips the solenoid valve on two-stage burners
with air shut-off. Adjustment is via limit switch cams on
the positioning drive roller.
You can refer to the presetting table for the cam positi-
ons for adaptation of the burner to the requisite boiler
output.
For this:
Remove cover from air valve positioning motor. Chan-
ge cam positions with aid of adjusting key. The adju-
sting key is located on the side of the air flap positioning
motor.
If necessary, switching cams can be adjusted when
setting the burner.
Higher setting = More air, pressure increases
Lower setting = Less air, pressure decreases
Please note the following when adjusting the switch cams:
– Do not set cam position for ST1 higher than ST2.
– Set cam position MV2 roughly 10°-20° above cam position ST1.
– Check cam position MV2 after having corrected cam position ST1.
– After adjusting ST1 and ST2 you have to switch to the next stage in order to activate the new setting.
– When adjustment of the burner is complete, refit positioning motor cover and set switch on cover to
position for stage 2.
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