2915246
10
GB
ADJUSTMENT OF THE SERVOMOTOR
The servomotor controls the air damper and the gas
throttle valve.
It is provided with three adjustable cams controlling
the related change-over switches.
1)
Red cam
2)
Blue cam
3)
Orange cam
4)
Pointer
5)
Servomotor releasing lever
Red cam:
it controls the max. stroke, generally it is
positioned on 130°.
Blue cam:
it controls the min. stroke and remains al-
ways positioned on 0°, in this way, when
the burner is off the air damper is totally
closed.
Orange cam: it controls the minimal modulating power.
It is set by the factory on 30°: normally this
position is the most suitable for the first ig-
nition.
Thereafter the installer may vary this set-
ting accordingly with the installation re-
quirements.
6)
Cam with adjustable profile
7)
Adjustable profile
8)
Fastening screws
9)
Adjusting screws
10)
Throttle valve control sector
11)
Tension rod
12)
Gas adjustment shutter
5
4
1
2
3
