Riello RS 28/M, Installation, Use And Maintenance Instructions

Page: 28 / 48

20154169
26 GB
Start-up, calibration and operation of the burner
5.2.1 Servomotor
The servomotor provides simultaneous adjustment of the air damp-
er, by means of the variable profile cam, and the gas butterfly
valve.
The angle of rotation of the servomotor is equal to the angle on the
graduated sector controlling the gas butterfly valve. The servomo-
tor rotates through 90 degrees in 25 seconds.
Do not alter the factory setting for the cams; simply check that they
are set as indicated below:
Red cam: 90°
Limits rotation toward maximum position.
When the burner is at max output the gas butterfly valve must be
fully open: 90°.
Blue cam: 0°
Limits rotation toward the minimum position. When the burner is
shut down the air damper and the gas butterfly valve must be
closed: 0°.
Orange cam: 15°
Adjusts the ignition position and the MIN output.
5.3 Burner start-up
Close the control circuit and set switch 1)(Fig. 30) to “MAN”.
As soon as the burner starts check the direction of rotation of the
fan blade, looking through the flame inspection window 18)(Fig. 4,
page 10).
5.4 Burner firing
Having completed the checks indicated in the previous heading,
the burner pilot should fire. If the motor starts but the flame does
not appear and the flame safeguard goes into lock-out, reset and
wait for a new firing attempt.
Pilot adjustment has been illustrated page 16.
Having adjusted the pilot, reconnect the main valve and ignite the
main flame; it might require several attempts to purge the air from
the gas lines or to adjust the valve with little gas.
Once the burner has fired, now proceed with calibration operations.
Fig. 29
BLUE CAM
RED CAM
ORANGE CAM
RESET
D2266
Fig. 30
1 2
D791