Technical documentation Technical documentation
STES ed 07/01
EOLO STAR
OUTPUTS
Modulation coil
(MOD)
This is a positive square-wave signal with variable ON-OFF ratio (duty-cycle) that controls
the modulation coil of the gas valve and makes it possible to alter gas pressure to the
burner.
Ignition electrode
(E1)
This is a high voltage signal (about 16 kV) for energising the ignition electrode on the
boiler.
Programmer clock
(OP)
Permits energising the programmer clock at 230 V AC (optional). This can be fitted on the
boiler dashboard after removing the closing plate.
The signal is operative with master switch in 0 position. SUMMER and WINTER.
PUMP RELAY
This is a single-pole relay for controlling the pump (MP). It is excited when operation is
required.
REQUEST RELAY
This is a single-pole relay which is excited when the burner has to be ignited.
By means of its contact, the adjustment board ignition circuit is controlled.
V/G RELAY
This is a single-pole relay that is excited by the ignition circuit to energise the main gas
valve coils (VG).
FAN RELAY
This is a single-pole relay for controlling the fan (MV) which is excited when operation is
required.
ADJUSTMENTS
Heating potentiometer
(RISC)
For setting the temperature of the water for heating 35 ºC to 80 ºC.
Hot water potenziom.
(SANIT)
For setting the temperature of the hot water 35 ºC to 55 ºC.
Gas switch (JP1)
Depending on its position (MET/LPG), it adapts the modulation parameters for the gas for
which the boiler is set (natural gas / LPG).
Gas switch G110
(M14)
For adapting the modulation parameters of the board to gas G110
(town gas).
Engaged using the jumper on gas switch JP1 (natural gas/LPG)
which must be shifted onto switch M14
off = natural gas or
LPG
on = G110
(with JP1 off)
Anti-leak hot water post-
circulation switch
(JP2)
For engaging or disengaging hot water post-circulation and hot-water
anti-leak (see safety devices and modulation board).
The boiler is supplied with these functions engaged as standard.
off = functions not
engaged
on = functions
engaged
Heating timer (JP3)
Every time the unit switches off after achieving set temperaturie
during heating phase, a delay of 180 s / 30 s is engaged until the
subsequent ignition for the same request.
off = 30 s
on (standard)=
180 s
Max heating power
trimmer
(POT. MAX RISC.)
For setting max power during heating phase and adapting this to system requirements (from
minimum to maximum regulated on gas valve).
This adjustment should be made about 2 minutes after ignition in heating phase.
Min heating power
trimmer
(POT. MIN RISC.)
For setting min modulated power during heating phase (from minimum to 2/3 maximum).
This adjustment should be made during first 20 s after ignition in heating phase.
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