Riello RL 70/M Instrucciones De Instalación, Funcionamiento Y Mantenimiento página 25

3 - Intermediate output air/oil flow rate adjustment
Press the switch 2)(Fig. 26 page 21) "output increase" a little so
that the servomotor turns by about 15°. Adjust the screws until
optimal combustion is obtained. Proceed in the same way with
the other screws.
Take care that the cam profile variation is progressive.
D889
Switch the burner off with switch 1)(Fig. 26 page 21), at the OFF
position, disengage the cam 2)(Fig. 29) from the servomotor, by
pressing the button 3)(Fig. 30) and moving it to the right, and
check more than once that the movement is soft and smooth, and
does not grip, by rotating the cam 2) forward and backward by
hand.
Engage cam 2) to the servomotor again by moving button
2)(Fig. 30) to the left.
As far is possible, try not to move those screws at the ends of the
cam that were previously adjusted for the opening of the airgate
to MAX and MIN output.
Once you have finished adjusting outputs MAX - MIN - INTER-
MEDIATE, check ignition once again: noise emission at this
stage must be identical to the following stage of operation. If you
notice any sign of pulsations, reduce the ignition stage delivery.
Finally fix the adjustment by turning screws 4)(Fig. 29).
NOTE:
The servomor follows the adjustment of cam III only when
the cam angle is reduced. If it is necessary to increase the
cam angle, first increase the servomotor angle with the key
"output increase", then increase the III cam angle, and finally
bring the servomotor back to the MIN output position with
the key "output decrease".
In order to adjust cam III, especially for fine movements, key
10)(Fig. 30), held by a magnet under the servomotor, can be
used.
Burner calibration
 0 s :
Control device TL closes, the motor starts.
The pump 3) sucks the fuel from the tank through the piping
1) and the filter 2) and pumps it under pressure to delivery.
The piston 4) rises and the fuel returns to the tank through
the piping 5) - 7). The screw 6) closes the by-pass heading
towards suction and the de-energized solenoid valves 8) -
9) - 16) close the passage to the nozzle.
 5 s :
Servomotor starts: 130° rotation to right, until contact is
made on cam I)(Fig. 30 page 23).The air gate valve is posi-
tioned on MAX. output.
 47 s :
Pre-purge stage with air delivery at MAX. output.
 69 s :
Servomotor rotates to left until contact is made on cam III)
(Fig. 30 page 23).
 106 s :
Air gate valve and pressure regulator are positioned on MIN
output.
 108 s :
Ignition electrode strikes a spark.
 111 s :
Solenoid valves 8) - 9) - 16) open; the fuel passes through
the piping 10) and filter 11), and enters the nozzle.
Fig. 30
A part of the fuel is then sprayed out through the nozzle,
igniting when it comes into contact with the spark: flame at a
low output level, point A; the rest of the fuel passes through
piping 12 at the pressure adjusted by the regulator 13, then,
through piping 7), it goes back into the tank.
 116 s :
The spark goes out.
 126 s :
The starting cycle ends.
23 GB
2915996