Immergas EOLO Mini - Low-Voltage Circuit

Technical documentation Technical documentation
STEME ed 07/03
20
EOLO MINI
LOADS
Circulating pump
(MP)
This is powered by the adjustment board whenever there is a demand for heating or
antifreeze.
Permits circulation of water in the boiler circuit.
Fan (MV)
Ensures air flow inside the sealed combustion chamber and extraction of the combustion
flue.
It is powered by the adjustment board.
Gas valve (VG)
(main coils)
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.
Ignition electrodes
(E1 - E2)
These are controlled by the ignition circuit of the adjustment board which provokes an
electric spark that ignites the air/gas mix.
Programmer clock
(OP)
(optional)
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 main switch in position 0. SUMMER and WINTER.
LOW-VOLTAGE CIRCUIT
SAFETY DEVICES AND CONTROLS
Delivery sensor
(NM)
This permits to the modulation board to determine the temperature of the
water supply of the primary circuit.
Any breakage will stop burner operation.
Until the serial number 2238340 it was positioned in immersion in a
sump located on the three way valve body.
From serial number 2238341 it is located at the outlet of the primary
heat exchanger .
NTC sensor
10 kohm 25 ºC
Domestic hot water switch
(SS)
Following sampling of hot water, this affects the adjustment board so the
boiler starts up during the hot water mode.
When idle this enables operation during the heating mode.
Double-contact
switch
Flue pressure switch (SV)
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 ignition cycle start.
Double-contact
switch
Depending on position, permits:
Main switch
(IG)
0
(SUMMER)
(WINTER)
RESET
- circuit not powered
- hot water operation
- hot water and heating operation
- resets after the no ignition or high temperature
safety device have been activated (the RESET
position operates at mains voltage, closing a
contact that acts on the ignition circuit)
3-position double
switch + reset
button