15
STESkW ed 05/06
EOLO Star 23 kW
Technical Documentation
Technical Documentation
Loads.
This board is always powered regardless of the position of the functioning button (S2)
(see integrated board operation)
.
Integrated board
It is powered by the integrated board when there’s either a central heating or antifreeze
request.
It permits circulation in the primary circuit.
Boiler circulator
(M1)
It is powered at mains voltage by the integrated board when it is necessary to ignite the
burner.
It permits the flow of gas to the burner.
Gas valve (Y1)
(main coils)
It is controlled by the integrated board that provokes a spark between its end and the
burner surface that ignites the air/gas mix.
Ignition electrode
(E1)
It ensures the flow of air inside the sealed chamber and the exit of fumes produced by
combustion.
It is powered by the integrated board.
Fan
(M20)
Low voltage circuit.
This device is to control the appliance remotely
(SUMMER / WIN-
TER selection, setting and indicating temperatures, displaying alarms,
resetting, etc.)
and acts as a weekly timer/room thermostat.
If the CRD is installed the X40 jumper must be removed.
Remote digital control
(CRD)
(optional)
See Remote
Digital Control
Operation
(CRD)
This switch acts on the integrated board after some domestic water
has been drawn, causing the boiler to work in the d.h.w. mode.
When idle it enable operation in the central heating mode.
D.h.w. flow switch
(S4)
Interrupted
contact
Safety devices and controls.
When pressure in the boiler circuit is below 0.3 bar the burner
switches off.
System pressure switch
(S5)
Interrupted
contact
This acts on the integrated board and enables burner operation
when the fumes are expelled correctly.
When closed and the fan is off, it does not enable the start of the
ignition cycle.
Flue pressure switch
(S6)
Changing
contact
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Summary of Contents for EOLO Star 23 kW
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