Low-Voltage Circuit - Immergas EOLO Star Export Manual

Technical documentation
Circulator
(MP)
Ignition electrode
(E1)
Programmer clock
(OP)
(optional)
Gas valve (VG)
(main coils)
Fan (MV)
Absolute water pressure
switch (SP)
C.H. NTC thermistor
(NM)
D.H.W. thermistor
(NS)
Flue pressure switch
(SV)
Hot water switch
(SS)
Main switch
(IG)
STES ed 07/01
LOADS
This is powered by the adjustment board whenever there is a demand for heating or
antifreeze.
Permits circulation of water in the heating circuit.
This is controlled by the ignition circuit of the adjustment board which provokes an electric
spark between its end and the burner surface that ignites the air/gas mix.
This clock operates a switch (see low-voltage circuit safety devices and controls) enabling
or disabling boiler operation during heating for the selected time intervals.
This is powered with master switch in position 0. SUMMER and WINTER.
This is powered by the ignition circuit of the adjustment board when the burner has to be
ignited.
Permits flow of gas to the burner.
Ensures the flow of air inside the sealed combustion chamber and the exit of fumes
produced by combustion.
Powered by the adjustment board.

LOW-VOLTAGE CIRCUIT

SAFETY DEVICES and CONTROLS
This affects the adjustment board, stopping boiler operation when the
pressure of the boiler circuit falls below 0.3 bar.
Permits the modulation board to determine the temperature of the water
supply of the heating circuit.
Any breakage will stop burner operation both during heating and hot
water phases.
It is positioned on the heating supply pipe of the exchanger.
Enables the modulation board to determine hot water outlet temperature.
Its breakage stops burner operation during the hot water phase.
Fitted in the hot water pipe at exchanger outlet.
This affects the adjustment board, enabling the ignition circuit and then
boiler operation when the fan ensures correct fume extraction.
When closed with fan off, does not enable start of ignition cycle.
Following an hot water request, this affects the adjustment board so the
boiler starts up during the hot water phase.
When idle this enables operation during the heating phase.
It is located inside the hot water flow meter.
Depending on position, permits:
0 - low voltage circuit not powered
- hot water operation
- hot water and heating operation
- resets after the no ignition or high temperature safety device
RESET
have been activated (the RESET position operates at mains
voltage, closing a contact that acts on the ignition circuit)
15
Technical documentation
Double-contact
switch
NTC sensor
10 kohm 25 ºC
NTC sensor
10 kohm 25 ºC
Double-contact
switch
Double-contact
switch
3-position double
switch + reset
button
EOLO STAR