Servomotor Adjustment - Riello GAS 3 P/M Installation, Use And Maintenance Instructions

6.5

Servomotor adjustment

SQM 40 servomotor provides simultaneous adjustment of the air
damper by means of the variable profile cam and the gas butterfly
valve.
It performs a 130° rotation in 45 s.
It is equipped with three adjustable cams that activate as many
contacts, factory set as follows:
RED cam
I
Limits rotation toward maximum position.
BLUE cam
Limits rotation toward minimum position.
II
With burner off, the air damper must be
closed.
ORANGE cam:
III Adjusts the ignition position and the MIN
output.
IV Not used
V Not used
VI Not used
Each cam is equipped with a screw that adjusts the activation
point of contacts.
20159111
Start-up, calibration and operation of the burner
130°
0°
20°
20074577
28 GB
Fig. 25