9
E. 04.99• G.13.11.07
Function
STA:
The servomotor STA 13 B0 is for the purpose of air flap
adjustment on burners with a 2-stage or modulating
mode of operation. Adjustment is via limit switch cams
on the positioning drive roller.
After each normal shutdown, the positioning motor
moves into the air seal (ST0).
The cam positions for adapting the burner to the requi-
red min. output/1st stage are given in the preadjust-
ment table.
Refer to adjustment tables on Pages 11-14.
To do so:
Remove cover from air flap positioning motor. Alter the cam positions via the adjusting screws with
a standard screwdriver.
The switching cams can be readjusted when the burner is adjusted.
Higher number = increase air
Lower number = reduce air
Adjustments to ST1 and ST2 do not become effective until a brief switchover between 1st/2nd stage (or
triggering of Up/Down on output controller) has taken place.
Adjust cam ST1/min. no greater than ST2/max.
After having readjusted the burner, refasten the servomotor hood and set the switch on the lower part of
the control unit to the position 2nd stage.
Cam position (preset ex-works)
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