Riello Gulliver BS1/M, Installation, Use And Maintenance Instructions

Page: 28 / 36

20096985
26 GB
Start-up, calibration and operation of the burner
8 Repeat operations 6) and 7) until no more adjustments of
the gas/air ration calibration and the POINT 0 screws are
needed.
9 Check the combustion values at an intermediate output and
if necessary proceed with further adjustments of the gas/air
calibration and the POINT 0 screws.
When finished, after checking that the burner has a good
ignition and good flame stability, select automatic operating
by putting the selector switch to “AUT” (Fig. 20): the modula-
tion will occur between the calibration position of CAM II and
that of CAM I.
6.4 Air damper servomotor adjustment
CAM II makes sure the air damper closes when the burner has
stopped. It is factory set at 0°.
CAM III adjusts the position of the air damper when the burner is
at minimum output. This can be adjusted during commissioning.
CAM IV is joined solidly to CAM III.
CAM I adjusts the position of the air damper when the burner is
working at maximum output and should be used to limit the output
of the burner (adaptation to the output of the boiler). It is factory
set at 90°.
The servomotor follows the adjustment of CAM III only when the
cam angle is reduced.
If the cam angle needs to be increased, it is first necessary to in-
crease the angle of the servomotor with the key “increase output”
+)(Fig. 20), then increase the angle of CAM III and finally bring
the servomotor to the MIN output position with the key “decrease
output” -)(Fig. 20).
For any adjustment to CAM III, remove the cover 1)(Fig. 21),
snap fitted, remove the relative key 2) from inside and insert it into
the notch of CAM III.
6.5 Gas pressure switch
STOP CAM II
WARNING
Do not change!
FIRST STAGE CAM III
SECOND STAGE CAM I
Fig. 21
D4438
D4439
Fig. 22
WARNING
To calibrate the gas pressure switch, refer to the
gas train manual.