16
Bentone
172 515 15-2 2021-05-03
4.9 Setting Damper motor, modulating operation
Air adjustment
The damper motor rotates the air damper between three
preset positions: completely closed, low load and high
load. These positions are controlled in the motor by
colored cam discs:
• Orange cam disc is adjusted for low load (approx.
5-10°).
• Red cam disc is adjusted for high load (approx.
90°).
• Blue cam disc is factory set for closed air damper
during standstill.
• Black cam disc has no function during sliding and
modulating operation.
Setting amount of gas
• Before starting the burner, vent the line so that gas
is safely available at the multi-block.
• Connect a manometer for measuring outlet
pressure (PBr).
• Set the control switch to the MAN position.
• Set gas pressure switch min and air pressure
switch in position MIN and (if mounted) gas
pressure switch max in position MAX.
• Start burner. If no fl ame is formed and the
manometer does not give a reading, adjust the
amount of gas by increasing with screw N on the
multi-block. Check combustion values.
• Set high load by pressing ”+” control switch
(increase). Adjust the amount of gas with screw
V on the multi-block and check the combustion
values.
• Return to low load ”-”, check combustion value
and adjust if necessary.
• If necessary, repeat the setting on low (N) and high
load (V).
• Adjust the orange and red cam discs to obtain the
desired effect on low and high loads. Check the
amount of gas on the system’s gas meter.
• Adjust air and gas pressure switches after
adjustment, see special instructions.
• Set the control switch to the AUTO position.
Release
By pressing the button, the motor is disengaged and the
air damper can be turned. The function is used when
servicing air dampers.
Release button
High load (red)
Low load (orange)
Closed air damper (blue)
Solenoid valve High load (black)
Summary of Contents for BG400M
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