Riello DB 4 SM BLU Installation, Use And Maintenance Instructions page 34

Procedures 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.
Maximum output
Maximum output should be selected from the firing rates, see Fig. 1.
Max. gas adjustment
Slowly increase the output, checking it does not exceed the maximum 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. 19 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. 19. Do not turn just one screw, but turn those nearby as well, so
that the cam curve is progressive.
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).
Min. air adjustment
Change the initial air cam profile by turning the screws (2) 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.
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 profiles, as previously set. When adjustment is
complete, block the transversal screws on the variable profile cam.
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CHAPTER Preparation for start up