Description of functioning
technical
Output
Time
If the heating selected temperature is achieved in less than 5 minutes. The next heating
cycle will result in the minimum burn period to be extended to 5 mins.
If the burner continues to burn at minimum power for 5 minutes without restarting the
Modulation process can then start to increase the burner power if required.
If during the 5 minutes at minimum power the boiler shuts down, the above sequence is
repeated.
Set point Security
When the boiler is working in D.H.W., with the burner lit with at least the minimum
power, and the DHW energy requirment is lower than the minimum power.
The above situation will result in the following if DHW temperature is greater than
DHW selected temp (+ 8º C ) or+ 4º C for more than 15 seconds then the boiler
starts to work in ON-OFF cycling mode.
While the boiler is in ON-OFF mode, the boiler starts at least 8 seconds and stops
working for; at least, 4 seconds, and always working at the minimum power. The
boiler comes out of this ON-OFF mode when DHW temperature is lower than DHW
set point - 4º C or when DHW temperature is lower than DHW set point during more
than 45 seconds and the boiler begins to regulate again
85º C Security
While DHW is working, if the temperature of the primary circuit
reaches 85º C,
the boiler
will limit (by modulation) not to go over 85º C. This security works while DHW
temprature is lower than DHW
selected temprature.
88º C Security
While DHW is working, if the temperature of the primary circuit arrives up to 88º C
the gas valve closes and the burner will shut down, the pump continues to run in order
to reduce the temperature of the primary circuit. When the temperature of the primary
circuit reaches at DHW selected temperature + 20º C the boiler will relight and modulate.
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