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Technical description of the burner
3
3.12 Servomotors
Introduction
The servomotors that equip the burners of the RS range work directly on
the air damper and the gas butterfly valve, without mechanical lever-
ages but via the interposition of an elastic coupling.
They are commanded by the control box, which constantly checks their
position by means of a return signal from the optic sensor inside the ser-
vomotor.
For this reason it is absolutely forbidden to remove
the cover of the servomotors.
WARNING
The position (in degrees) of the servomotors can be seen on the display
of the Operator Panel. See Ch. 5.18, Parameter 922, index "0" for fuel
servomotor, index "1" for air servomotor.
The servomotors are electrically connected to the control box by means
of RAST 2.5 type connectors.
When servicing or replacing the servomotors, take care not to invert
the connectors. Follow the indications given in the electrical layouts or
the silkscreen printing on the control box cover.
Technical data
Model
Type of motor
Electrical supply
IP
Firing rate
Opening time 0 - 90°
Torque
Input power
Rotation
12
GB
Fuel
servomotor
SQM33.4..
Stepping motor
AC/DC 24V
min: 5s, max.: 120s depending on the type of control box
1.2 Nm
7.5 W
Clockwise/anticlockwise (can be selected from the control box)
Air
servomotor
SQM33.5..
IP54
0 - 90°
3 Nm
10 W
D8271
Fig. 7
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