Immergas EOLO Mini Technical Documentation Manual page 25

Technical documentation Technical documentation
Subsequently, the signal varies in a way directly proportionate to the difference between the
temperature set by means of the heating potentiometer (C.H.) and that read by the NTC heating
sensor (NM) and, if necessary, increases so as to reach in 100 seconds the value set by means of the
maximum heating output trimmer (C.H. POWER).
When the set temperature is exceeded, the REQUEST RELAY contact is opened with consequent
switching off of the burner, the relighting of which for the same request is prevented for a time of
180 s / 30 s.
Domestic hot water request
Once the d.h.w microswitch (SS) has been moved, the burner ignites in the same way as in heating.
After detecting the presence of the flame by means of the detection electrode (E3), the signal to the
modulation coil is changed with reference to the difference between the delivery temperature
combined with the adjustment of the d.h.w potentiometer (D.H.W.) and the temperature read by the
delivery sensor (NM).
When the reference temperature is reached, the burner is kept operating at minimum power.
When the limit temperature is exceeded (85ºC), the REQUEST RELAY contact is opened. This is
closed again just as soon as the temperature drops.
NOTE. The board can be adjusted (see d.h.w. modulation switch JP2) so the regulation circuit opens
the REQUEST RELAY when the set value is exceeded.
The contact is closed again as soon as the value drops below that set.
Antifreeze request
With main switch (IG) in SUMMER or WINTER position, when the temperature read by the NTC
supply sensor (NM) falls below 8ºC, the board triggers the generator in heating phase with burner at
minimum heating output until a boiler temperature of 43°C is reached.
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STEME ed 07/03 EOLO MINI