Setting Damper Motor, Modulating Operation - Bentone BG 550 M LN Installation And Maintenance Instruction

6.6

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 gas valve.
• 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
gas valve. Check combustion values.
Set high load by pressing "+" control switch
•
(increase). Adjust the amount of gas with screw
V on the gas valve and check the combustion
values.
Solenoid valve High load (black)
High load (red)
Low load (orange)
Closed air damper (blue)
24 Bentone
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.
Recommended excess air
Excess air fl ue gases
Gas quality
% O % CO
2
Natural gas 3 - 5
Propane 3 - 5
Butane 3 - 5
Liquefi ed
3 - 5
petroleum gas
Biogas 3 - 5
Max % CO
2
Lambda 1.2
2
≈10
11.9
≈11.5
13.9
≈11.5
14.1
≈11
13.8
Release button
172 515 15-3 2022-11-25