Description of functioning
t e c h n i c a l
11
Anti Freeze Safety:
When the
temperature (
read by
flow
thermistor)
falls to
6ºC the pump
will run until the
temperature
reaches to 9ºC. If the
temperature
continues to fall and
the
flow
thermistor
reads less than 3 ºC
the boiler
will light up at
minimum power until
the
heating circuit
temperature reaches 20º C
after that the pump
runs for a further 30 minutes. After the pump has run for 1 hour the PCB
reads the temperature if it is between 3º and 6º C the pump will stop running
If the burner is burning for
over
3 hours, the control circuit stops the burner, reads the tem-
perature and if the temperature is lower than 3
degrees
the burne
r will relight.
Pump Antiblock safety:
If during the last
23 hours the
pump has
not run the PCB will run the pump for 30 seconds
Overheating:
If
the
flow
thermistor
detects
a lower temperature than
50ºC and there is a higher
output than 95%
after 5 minutes the boiler will shut down then relight
Fuzzy logic
This program operates only in central heating mode the principal purpose is to detect the
size of the heating load connected to the boiler and to reduce unnecessary gas use.
In heating demand the boiler will only operate at minimum burner pressure for (4.0mb
propane) for the
first
30 seconds after the flame is established.
After this period of minimum burn the boiler will then modulate to increase the power to
the heating system if required.
.
Output
Time
30sec.
9
10
