21
STESkW ed 05/06
EOLO Star 23 kW
Technical Documentation
Technical Documentation
Inputs.
It sends to the electronic board the signals about the functioning mode
(Stand-by / Summer
/ Winter)
, the temperatures setting
(domestic hot water and central heating)
and the heating
requests
(times, room temperature, etc.)
.
Remote digital control
(CRD)
(optional)
When the pressure in the primary circuit is below 0.3 bar this
switch cuts power off to the K2 relay preventing the start of the
ignition cycle.
System pressure switch
(S5)
Open =
no pressure
Closed =
pressure OK
This switch enables burner ignition powering the K2 relay when
the fumes are being expelled correctly.
If the “NO” contact closes with the fan off, it does not enable start
of the ignition cycle.
Flue pressure switch
(S6)
Changing
contact
This signal indicates the burner flame has been detected.
It allows the board to increase current to the modulation coil (Y2) after having limited it
during the ignition phase.
It keeps the gas valve (Y1) open.
Flame detection
(E2)
It indicates an ongoing d.h.w. request.
After domestic hot water has been drawn, it enables boiler opera-
tion in the domestic hot water mode which is given priority over
the system central heating mode.
D.h.w. flow switch
(S4)
Closed = d.h.w.
request
It is a resistor that varies in an inversely proportionate way to the
temperature of the primary circuit delivery water.
It is also used as a limit thermostat (90°C).
Delivery probe
(B1)
NTC probe
10 kohm 25 °C
It is a resistor that varies in an inversely proportionate way to the
outlet temperature of the domestic hot water.
D.h.w. probe
(B2)
NTC probe
10 kohm 25 °C
It is a switch with free contacts that sends a
(low voltage)
signal to
the board, enabling operation in the central heating mode when
room temperature is below that requested.
Room thermostat
(S20)
(external optional)
Open = Central
heating OFF
Closed = Central
heating ON
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