Servomotor - Riello RS 190/M Installation, Use And Maintenance Instructions

5.3

Servomotor

The servomotor (Fig. 36) provides simultaneous adjustment for the
gas butterfly valve, by means of the adjustable profile cam and the
air damper: 1)(Fig. 35 and Fig. 36).
It rotates by 130° in approx. 36 s.
To open the servomotor and release the mechanical cam and the
gas butterfly valve, see procedure (Refer to paragraph "Servomo-
tor adjustment" on page 28).
Key (Fig. 35)
1 Servomotor
2 Graduated sector for gas butterfly valve
3 Index for graduated sector 2)
4 Adjustable profile cam
5 Adjustment screws for cam starting profile
6 Adjustment fixing screws
7 Adjustment screws for cam and profile
8 Cam
9 Servomotor cams, check that they are shown below in the
event of a modification, follow what is described below for
each cam
10 Potentiometer already set in factory, do not carry out any
adjustment.
The factory settings must not be changed for the first firing, just
check that they comply with the details below.
CAM I (RED): 130° (The same for all models). Limits
the rotation towards the maximum.
In the event of a variation, absolutely do not
adjust beyond 130°.
WARNING
CAM II III IV (BLUE ORANGE YELLOW): 0°
Do not use, they have no effect on the operation
of the burner.
CAM V (BLACK): 15° Adjusts the ignition position
and MIN. output.
CAM VI (GREEN): 0° Limits the rotation towards the
minimum. With the burner off the air damper
and the gas butterfly valve should be closed: 0°.
It is recommended that no adjustments are
made.
Start-up, calibration and operation of the burner
27
1
20161735
9
GB
4
7
6
10
20162481
3
2
5
8
Fig. 35
Fig. 36
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