Procedure For Setting The Burner; Maximum Output; Minimum Output; Intermediate Output Levels - Riello DB 12 SM C03 TC FS1 FB A0 Installation, Use And Maintenance Instructions

6.6

Procedure for setting the burner

Turn the AUTO / MAN selection switch on the control panel to
MAN (manual).
Turn the burner on.
If it does not ignite, it could mean that the gas does not reach the
combustion head within the safety time period of 3 s. In this case
increase the ignition gas delivery level. When the burner ignites,
it can be completely set and adjusted.
6.6.1

Maximum output

Maximum output should be selected from the firing rate, see
page 10.
Max. gas adjustment
Slowly increase the output, checking it does not exceed the max-
imum gas delivery, taking the servomotor to 130° and make the
first maximum setting to the air cam.
At this point, adjust the pressure regulator to reach the maximum
delivery required with the gas butterfly valves completely open
(90°), or turn the screws 2)(Fig. 26) on the gas cam profile and/or
the gas train adjustment valve.
Max. air adjustment
Vary the final profile of the air cam by turning the screws
2)(Fig. 26).
Do not turn just one screw, but turn those nearby as well, so that
the cam curve is progressive.
6.7

Ignition pilot burner

For correct functioning, adjust the gas pressure (measured on
the socket located on the valve) to between 30 ÷ 50 mbar .
Gas
G20
G31
Check pilot flame stability before starting up the
main burner.
WARNING
Continue with the ignition of the burner making sure the pilot has
ignited properly.
20119882
Start-up, calibration and operation of the burner
3
mbar Sm /h
1.5 12.3
1.4 3.2
6.6.2

Minimum output

Min. gas adjustment
Using the manual switch, go to the minimum run (factory setting
20°).
Change the gas cam profile by turning the screws 2)(Fig. 26).
Turn disc B)(Fig. 27) if necessary.
Min. air adjustment
Change the initial air cam profile by turning the screws 2)(Fig. 26)
on the variable profile air cam.
Take care not to change the final parts of the profile of the cam
that regulates the air damper at maximum delivery, as previously
set.
6.6.3

Intermediate output levels

Turn the manual switch to the intermediate levels.
The air/gas ratio is adjusted by turning the respective screws to
vary the air and gas cam profiles.
Take care not to change the final parts of the air and gas cam pro-
files, as previously set.
When adjustment is complete, block the transversal screws on
the variable profile cam.
Tab. J
20119787
26 GB
20119787
Fig. 28