Riello DB3 SM C03 Installation, Use And Maintenance Instructions page 48

5.3 Servomotor adjustment (SQM 10)
1 - 4 : Limit switch cam (max. air damper opening)
2 : Limit switch cam (air damper closed)
3 - 5 : Minimum delivery (and ignition) position cam
6 : Positioning reading indicator
7 : Servomotor release
The servomotor contemporarily regulates, by transmission, air delivery
and pressure and delivery of the fuel being used.
It is fitted with a number of adjustable cams that action the same num-
ber of selector switches.
Cam pos.1: limits maximum opening of the servomotor.
Cam pos.2: limits servomotor limit switch in the 0° position.
When the burner is off, the air damper is completely
closed.
Cam pos.3: fixes the minimum modulation position.
It is set in the factory at approx. 20° (just one type of fuel).
Cam pos.4: limits maximum opening of the servomotor (for mixed burners working with gas).
Cam pos.5: limits minimum delivery. It is set in the factory at approx. 20° (for mixed burners working with gas).
Cam rest: available.
Important: the position of 130° must not be exceeded for limit switches (cam 1 - 4).
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CHAPTER Preparation for start up
D1500
Fig. 24