34
DAMPER MOTOR 2- STAGE
Air adjustment
Releasing button
172 305 58-1 12-01
High capacity (red)
Low capacity (orange)
Closed damper (blue))
Solenoid valve
High capacity (black)
Releasing button
N.B.
The upper po-
sition is the stan-
dard position
DAMPER MOTOR 2-STAGE
Air adjustment
The damper motor turns the damper between three pre-set positions: fully
closed, low load, full load. These positons are controlled in the motor by
cams of different colours. The black cam controls the gas valve for full
load.
If the air volume needs changing: Remove the cover of the damper motor
and change the position of the cams by turning them with the tools ac-
companying the burner.
Low load:
Adjust the operating switch to full load (ll).
* Reduce the air volume:
Turn orange cam towards 0°
* Increase the air volume:
Turn orange cam towards 90°
Adjust the operating switch back to low load and check the air volume.
Full load
Adjust the operating switch to low load (l).
* Reduce the air volume:
Turn red cam towards 0°
* Inrease the air volume:
Turn red cam towards 90°
If the red cam is moved, change the black cam as much.
Adjust the operating switch to low load and check that the correct air
volume has been obtained.
Note!
The blue cam is the limit position for fully closed damper and it is normally
not necessary to change it.
Releasing button
By pressing the button and snapping it down, the motor will be released
and the damper can easily be turned. This function facilitates an exchange
of damper motor.
Summary of Contents for BG 550 LN
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