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Following items do not need, generally, any further adjustment:
A - Servomotor
B - Pump
C - Motor overload relay
A - SERVOMOTOR
5
4
Fig. 2
The servomotor controls contemporaneously the air delivery and pressure and the fuel delivery.
It is provided with three adjustable cams, controlling the corresponding switches.
st
1
cam:
it controls the stroke of the servomotor at the position of 0°. When the burner is off the air damper is
completely closed.
nd
2
cam:
it controls the stroke of the servomotor at the position of 130°.
rd
3
cam:
it controls the minimum modulating output, leaves the factory set at 20°.
5481
BURNERS ITEMS SET AT THE FACTORY
1
2
3
6
D1999
7
GB
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