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Description of function
NOTE
:
Iwabo Villa S2 operates either by using the boiler thermostat or the burners built-in digital
thermostat. In both instances, the pellet burner must be connected via the boiler overheat
protector.
Normal start-up
When the thermostat gives a start signal to the pellet burner, the fan starts operating and the
photocell is checking for the fire. If there is no fire, a start signal is given for ash removal. When
the grate has completed its movements, pellets are being fed in during a time determined by
control system, while the ignition is being activated. When this ignition fuel feeding phase is
completed, the control system waits for the fire signal from the photocell.
After the photocell has detected the flame, small amounts of pellets are beeing fed in
during a
transitional phase
for the burner. Pellet feeding increasses succesivelly until the final feeding quantity is
obtained.Now the pellet burner is being fed with the final amount of pellets until the operating
thermostat cuts out (gives the stop signal).
This signal stops the pellet feed, while the fan continues to supply the pellet burner with the
combustion air.
When the photocell detects no more flame, clean-blowing takes place, while the
burner is waiting for a now start signal from the thermostat.
NOTE
: The drive for the grate movement is very strong and can cause the hazards. Never
insert parts of your body or foreign objects into the burner while the burner is switched on.
Normal start when there is still fire in the pellet burner
If the photocell detects the flame in the start-up phase, the control system moves right onto a
transitional phase. The pellet burner then continues operating in the same way as in normal
start-up ( see above).
Normal start when the control system does not get the fire signal
The normal start-up procedure is also followed when the control system does not recieve a fire
signal. The system then makes a new start.up attempt shortly thereafter, in which it reduces the
ignition fuel dose to some 45%, and it might even reduce the ignition time. These parameters
can be changed in the Advanced manu; this may be done by a skilled person only. If even the
second attempt fails, all the functions stop and the alarm is triggered. This alarm is flashing on
the display.
NOTE:
Be sure a sufficient flue gas temperature is obtained. It must be at least 60°C one meter below
the chimney top. If it is lower, consult your chimney sweeper. Flue gases cooler than 60°C
during a combustion cycle increase the risk of condensation damage in the chimney.
. The length of this phase varies depending on output option selected
6
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Chapters
