Low-Voltage Circuit - Immergas EOLO Mini Technical Documentation Manual

Technical documentation
Circulating pump
(MP)
Fan (MV)
Gas valve (VG)
(main coils)
Ignition electrodes
(E1 - E2)
Programmer clock
(OP)
(optional)
Delivery sensor
(NM)
Domestic hot water switch
(SS)
Flue pressure switch (SV)
Main switch
(IG)
STEME ed 07/03
LOADS
This is powered by the adjustment board whenever there is a demand for heating or
antifreeze.
Permits circulation of water in the boiler circuit.
Ensures air flow inside the sealed combustion chamber and extraction of the combustion
flue.
It is powered by the adjustment board.
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.
These are controlled by the ignition circuit of the adjustment board which provokes an
electric spark 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 main switch in position 0. SUMMER and WINTER.

LOW-VOLTAGE CIRCUIT

SAFETY DEVICES AND CONTROLS
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 .
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.
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.
Depending on position, permits:
0 - circuit not powered
- hot water operation
(SUMMER)
- hot water and heating operation
(WINTER)
- resets after the no ignition or high temperature
RESET
safety device have been activated (the RESET
position operates at mains voltage, closing a
contact that acts on the ignition circuit)
20
Technical documentation
NTC sensor
10 kohm 25 ºC
Double-contact
switch
Double-contact
switch
3-position double
switch + reset
button
EOLO MINI