Immergas EOLO Mini Technical Documentation Manual page 26

Technical documentation
Clock programmer
switch (OP)
(optional)
Delivery sensor
(NM)
Detection electrode
(E3)
Exchanger overheating
safety (TS2)
(fitted until serial number
2238340)
Flue pressure switch
(SV)
Hot water signal
(SS)
Main switch
(IG)
Overheating safety
device
(TS1)
Room thermostat (TA)
(external optional)
Ignition electrodes
(E1 - E2)
Modulation coil
(MOD)
Programmer clock
(OP)
STEME ed 07/03
INPUTS
This is a clean contact switch controlled by a clock that enables or
disables boiler operation in heating phase during selected time
intervals .
This is a resistance that can be varied in a way inversely proportionate
to the temperature of the delivery water of the primary circuit.
Also used as limit thermostat (85° ºC).
Enables the ignition circuit of the board to detect the presence of a flame on the burner.
If this does not operate, the no ignition lock trips, signalled by the lighting up of led LD2
(red).
The eventual operation before burner ignition is indicated by the flashing of led LD2 (red)
When the temperature in the primary circuit exceeds 115°C this
interrupts power to the main coils of the gas valve (VG).
The tripping of this device stops boiler operation and is indicated by
the flashing of red led LD2.
This provides power to the gas valve when fan operation ensures
correct flue extraction.
If this is closed with the fan off, it does not enable ignition cycle start
This indicates the type of request under way (hot water or heating).
Depends on position of hot water flow micro switch (SS) of the 3-way
valve.
This is a double switch which, depending on position, either energises
or fails to energise the low-voltage circuit and indicates whether hot
water or heating is enabled.
In RESET position, this releases the ignition circuit in case of tripping
of flame lock or overheating.
When safety temperature is exceeded this interrupts power to the main
coils of the gas valve (VG).
The tripping of this device stops boiler operation and is indicated by
the flashing of red led LD2.
This is a clean contact switch that enables operation in heating phase
when the room temperature falls below that required.
OUTPUTS
This is a high voltage signal (about 16 kV) for energising the burner ignition electrodes.
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.
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 main switch in 0, SUMMER and WINTER position
26
Technical documentation
open = heating
OFF
closed = heating
ON
NTC sensor
10 k ohm 25 ºC
Two-contact
clicson thermostat
open = fan OFF
closed = fan ON
.
open =
no hot water request
closed =
hot water request
Switch A
open= circuit OFF
closed = circuit ON
Switch B
open = D.H.W
closed = HEAT.
Two-contact
clicson thermostat
open = heating
OFF
closed = heating
ON
EOLO MINI