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Technical documentation
Heating phase
STARTING
Main switch in WINTER position
POWER TO ADJUSTMENT CIRCUIT
The closing of main switch contact (WINTER position)
powers the adjustment circuit and enables operation in
heating phase
CLOSING OF ROOM THERMOSTAT SWITCH
Ambient thermostat request
POWERING PUMP
With the consensus of the absolute water pressure switch,
the modulation board powers the circulator (MP)
POWERING THE IGNITION CIRCUIT
If the temperature of the heating water is below that set, the
adjustment circuit of the board powers the ignition circuit
The board checks the correct position of the flue pressure switch (contact open)
The modulation board determines the closing of the flue pressure switch contact following fan
With the consensus of the overheating thermostat (TS), the ignition circuit powers the main
By means of the detection electrode, the ignition circuit detects the presence of a flame on
The boiler operates at a power that varies according to the type of request, the
STES ed 07/01
EOLO Star operation sequence
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FLUE PRESSURE SWITCH CONTACT CONTROL
FAN POWER
The modulation board powers the fan
FLUE PRESSURE SWITCH CONTACT CONTROL
IGNITION ELECTRODE POWER
The ignition circuit of the board powers the ignition electrode
GAS VALVE COIL POWER
coils of the gas valve.
BURNER IGNITION (SLOW)
The board sends the slow ignition signal to the modulation coil.
FLAME DETECTION
the burner and ends the ignition cycle
BOILER WORKING
adjustments/settings made and the temperature read by NTC sensors
Hot water phase
Main switch in SUMMER or WINTER position
POWER TO ADJUSTMENT CIRCUIT
The closing of main switch contact (SUMMER position)
powers the modulation board and enables operation in hot
HOT WATER OPERATION REQUEST
Domestic hot water demand
PUMP SWITCHOFF
The circulator (MP) is not operated or is turned off if a
heating request is under way
POWERING THE IGNITION CIRCUIT
If the hot water temperature is below that set, the
adjustment circuit of the board powers the ignition circuit
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operation
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Technical documentation
STARTING
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water phase
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EOLO STAR
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