Technical documentation Technical documentation
EOLO Superior PLUS OPERATION SEQUENCE
Central-heating phase D.h.w. phase
STARTING STARTING
Main switch in WINTER position Main switch in SUMMER or WINTER position
⇓⇓ ⇓⇓
MODULATION CARD AND CAR (remote
control) POWER SUPPLY
MODULATION CARD AND CAR (remote
control) POWER SUPPLY
When the main switch contacts close (WINTER position)
the modulation board and CAR (if fitted) are powered and
operation in central-heating mode is enabled
When the main switch contacts close (SUMMER position)
the modulation board and CAR (if fitted) are powered and
operation in d.h.w. is enabled
⇓⇓ ⇓⇓
CLOSING OF ROOM THERM. SWITCH / CAR
OPER. REQUEST
DOMESTIC HOT WATER OPERATION
REQUEST
Room thermo. or CAR (if fitted) request detects conditions
that require operation in central-heating phase
External storage tank water temperature below that set
⇓⇓ ⇓⇓
PUMP AND 3-WAY VALVE POWER SUPPLY PUMP AND 3-WAY VALVE POWER SUPPLY
The modulation board powers the circulator and the electric
3-way valve
The valve is moved to central-heating position
The modulation board powers the circulator and the electric
3.-way valve.
The valve is moved to d.h.w. position
⇓⇓ ⇓⇓
CLOSING OF PUMP PRESSURE MICROSWITCH
The circulation of water inside the primary circuit causes the closing of the pump pressure
switch
⇓⇓
FLUE PRESSURE SWITCH CONTACT CONTROL
The card checks the correct position of the flue pressure switch (contact NC (normally closed)
⇓⇓
FAN POWER SUPPLY
The modulation board powers the fan
⇓⇓
FLUE PRESSURE SWITCH CONTACT CONTROL
The modulation board checks the deviation of the flue pressure switch contact following fan
operation (contact normally open (NO)
⇓⇓
IGNITION CONTROL UNIT POWER SUPPLY
The modulation board controls the ignition control unit
⇓⇓
IGNITION ELECTRODES POWER SUPPLY
The control unit powers the ignition electrodes
⇓⇓
GAS VALVE POWER SUPPLY
With the consensus of the overheating thermostat, the control unit powers the gas valve coils.
⇓⇓
BURNER IGNITION (SOFT)
For a few seconds, the board conveys soft-ignition power to the modulation coil
⇓⇓
FLAME DETECTION
By means of the ionisation electrode, the ignition cardt detects burner ignition and conveys
the burner ignition signal to the modulation board
⇓⇓
BOILER OPERATION
The burner operates at an output that varies according to the type of request, the
adjustments/settings made and the temperatures read by the NTC sensors
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