22
STESkW ed 05/06
EOLO Star 23 kW
Technical Documentation
Technical Documentation
Outputs.
It is a unipolar relay for controlling the pump (M1) that is energised when its operation
is requested.
Pump relay
(K3)
This is a bipolar relay that is excited when the burner has to be ignited.
By means of its contact, boiler ignition is enabled.
Request relay
(K2)
It is a d.c. signal that controls the modulation coil; the pressure of gas to the burner may
be varied according to the output required.
Gas valve modulation coil
(Y2)
This is a (BUS) signal by means of which boiler temperature, operation in the d.h.w.
or central heating mode, and triggered alarms codes can be seen on the remote control
display.
Remote digital control
(CRD)
(optional)
This is a unipolar relay for controlling the fan (M20) that is excited when its operation
is requested.
Fan relay
(K4)
It is a 230 V ac signal indicating that the main gas valve (Y1) coils
are supplied.
Gas valve power supply
(Y1)
230 Vac = coils
supplied
0 Vac = coils not
supplied
It is a high voltage signal
(higher than 16 kV)
that determines an electrical discharge at the
end of the ignition electrode located on the burner.
Ignition electrode
(E1)
The boiler circulator (M1) is turned on for 30 seconds after:
- 24 hours of inactivity with the boiler in the SUMMER mode ( ).
- 3 hours of inactivity with the boiler in the WINTER mode ( ).
Circulator antiblock device
Safety devices.
If there is strong resistance of the system pressure switch, of the safety thermostat or flue
pressure switch contact
(contact not perfectly closed or worn)
, the integrated board performs
a reset and starts a new contact verification cycle; if, after 6 such cycles the problem hasn’t
been solved, the boiler is blocked.
To get the boiler working again, press the “Reset” button (S3) and then make either a
d.h.w. or central heating request.
Electromechanical con-
tacts block
(system pressure
switch, safety thermostat
and flue pressure switch)
(from October 2005)
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Summary of Contents for EOLO Star 23 kW
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