02.12.2022 Rev. 12
8.6. Air Pressure Switch Adjustment
While the burner is working without any problem, the air pressure switch
is adjusted to desired minimum pressure as follows.
Ø Unscrew the screw of the transparent cover and remove the cover.
Ø Turn the adjustment wheel in the direction to increase the pressure,
note the pressure value at which the burner is failed.
Ø Set the pressure switch to a value 1 mbar lower than the pressure
value at which the burner failed and close the pressure switch lid.
Ø It is recommended that this adjustment is carried out when the
burner is at minimum load.
8.7. Servomotor Adjustment
The amount of air is adjusted by means of the servomotor. The servomotor adjustment at two-stage and
modulating burners is made by the cams on the servomotor.
Ø SQN70
At Two-stage Burners;
I. Red Cam: Adjusts 2nd level max. air.
II. Blue Cam: Resets the clamp.
III. Orange Cam: Adjusts 1st level min. air.
IV. Black Cam: Adjusts 2nd level valve opening degree.
At Modulating Burners;
I. Red Cam: Performance max. air adjustment.
II. Blue Cam: Resets the clamp.
III. Orange Cam: Performs min. air adjustment.
IV. Black Cam: Not used.
Do not open servomotor. Do not interfere with. It may damage servomotor or change burner
settings.
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