5483
7
GB
BURNERS ITEMS SET AT THE FACTORY
Following items do not need, generally, any further adjustment:
A
- Servomotor
B
- Pump
C
- Starter
A - SERVOMOTOR
The servomotor controls contemporaneously the air delivery and pressure and the fuel delivery.
It is provided with three adjustable cams, controlling the corresponding switches.
1
st
cam
:
it controls the stroke of the servomotor at the position of
0°
. When the burner is off the air damper is
completely closed.
2
nd
cam
:
it controls the stroke of the servomotor at the position of
130°
.
3
rd
cam
:
it controls the minimum modulating output, leaves the factory set at
20°
.
Fig. 2
D1999
5
4
1
2
3
6
1
- 1
st
Cam (blue)
2
- 2
nd
Cam (red)
3
- 3
rd
Cam (black)
4
- Pointer
5
- Clamp
6
- Motor reset lever
