ECOFEL BOILER SERVICE MANUAL
8.
Operation in Usage Water Mode:
When a hot water tap is turned on while the boiler is in heater or usage water mode and when water flow rate from
the flow control switch is more than 0.3 bar (2.7 l/min), the wheel within the flow control rotates and informs the flow
sensor. Thus, the information that water is on is transmitted to the main card. Closed circuit water pressure is
checked. Circulation pump stops. As the fan starts running, the low pressure formed 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 through 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. By comparing the desired usage water temperature with the temperature
it measures from the usage water sensor, the main card increases or decreases the voltage it transmits to the mod-
ulation coil. At 8ºC above the desired temperature, the burner shuts down. Constant hot water comfort with ±1 de-
gree accuracy is provided by modulation.
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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.
Pump Does not Operate.
Demand comes from the usage water
temperature adjustment button.
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. Flame is generated.
Ionization electrode detects the flame formation
and sends information to the electronic card
In gas valve modulation, hot water
with ±1ºC accuracy is obtained.
Boiler outlet water temperature >8ºC From
adjusted temperature = Boiler shuts down.
When hot water tap is turned off, the burner
goes out. The pump discharges the heat
on it, the boiler stops.
