ECOFEL BOILER SERVICE MANUAL
7.
Operation in Heater Mode:
When the boiler is in the heater operation mode it checks all circuit components. If there is water pressure of more
than 0.8 bar in the boiler, circulation pump starts working. The main card compares the heating water temperature
data coming from the stream sensor with the temperature set by the user via the heater temperature adjustment button
on the front panel.
Fan starts running; the low pressure generated in the hermetic cabin turns off the pressure switch micro switch contact
by moving the pressure switch diaphragm with pressure measurement probes on the fan. Thus, main card receives
the information that the fan is running. By transmitting voltage to the gas valve and ignition transformer, main card
provides spark formation with the ignition electrode on the burner. In this way, flame is formed on the burner with
minimum ignition gas pressure. The ionization electrode on the burner transmits the current (at nano amperes
strength) generated by the effect of the flame to the main card. Main card detects the flame formation on the burner
and brings the heater water to the temperature set by the user by applying the pre-set partial load gas pressure from
the gas valve to the burner. As it approaches closer to the desired temperature, main card performs modulation by
reducing the voltage transmitted to the gas valve and when the heating water in the system reach 5ºC above the
desired temperature, main card puts out the flame by cutting the energy transmitted to the gas valve. Burner waiting time
starts. Fan stops. Circulation pump keeps running. When the pre-set burner waiting time is over, the main card
measures the temperature of the heating water. If heating water temperature is 3ºC below the desired water
temperature, burning process restarts.
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Revision Date: 29 February 2008, Rev. No: 0
ON/OFF controls the components
of the boiler.
System pressure is measured.
It should be above 0.8 bars.
Circulation pump starts.
Heat demand comes from the
heater temperature adjustment
button or room thermostat
Current temperature < 3ºC From
adjusted temperature = operation
demand continues
Fan motor starts.
Air pressure switch transmits information
to the main card that the fan is running.
Current is transmitted to the gas
valve and ignition electrode and flame
is generated.
Ionization electrode detects the
flame formation and sends information to
the electronic card
Boiler outlet water temperature >5ºC From
adjusted temperature = Boiler stops.
