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Technical documentation
Technical documentation
GAS CIRCUIT
The circuit consists of an atmospheric burner and a modulating type valve for gas combustion and gas
flow adjustment respectively.
- OPERATION
When the main coils (3) are supplied, both inner valve shutters open, allowing the gas to flow towards
the burner.
The flow rate/outlet pressure is regulated by means of the gas valve stabiliser and the modulation coil
(1).
By means of the burner nozzles (7), the fuel is injected into the venturi pipes (ramps) inside which the
air-gas mix is obtained that is ignited by the spark from the ignition electrode (5).
- MODULATING GAS VALVE
The gas valve (SIT 845) features two main coils (3) and a modulation coil (1) controlled by the
adjustment board.
The maximum and minimum outlet pressure settings can be made on this valve (see gas adjustments).
Main electrical coils (3)
SIT 845
Two coils of the ON-OFF type supplied (230V AC) by
the P.C.B. when the burner has to be ignited.
These are electrically connected in parallel and
supplied by mains power through a special connector
(2).
Modulation coil (1)
This is a low-voltage coil controlled by the modulation
board.
This controls the gas valve stabiliser and permits
changing the outlet pressure in a way proportionate to
the DC signal that runs through it.
- BURNER
The burner consists of 12 horizontal venturi pipes (6) in which the gas is injected by an equal number of
nozzles (7) mounted on the special collector (8).
Ignition occurs by means of the adjustment board which controls the ignition electrode (5) and detection
electrode (4).
Ignition electrode (5)
This is controlled by the ignition circuit of the
adjustment board which produces an electrical charge
between its end and the burner surface that ignites the
air-gas mix.
This is positioned on the front of the burner in line
with the centre ramp.
Detection electrode (4)
This is controlled by the adjustment board and detects
burner ignition.
It is positioned on the front of the burner on the same
ramp as the ignition electrode.
8
STES ed 07/01
EOLO STAR
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