15
CONTROL OF MAIN HEAT EXCHANGER
According to the required power during the heat request, the controls G1-G4 related to the
main exchanger are turned on all or partially.
The actuation of each control is reduced to a lapse of 4 seconds. Higher is the required
power, more the control will remain operative in this lapse.
The power in heating or during a sanitary request is calculated by PID algorithm.
Please see in the pictures below two examples related to 40% and 60% of total power.
In case of simultaneous request of heating and tank, the controls G1-G4 related to the
main heat exchanger will be directed in the following way:
Boiler status
Primary G1 ÷ G4
Only heating request
G1 ÷ G4 = modulation
Controls rotation:
Every hour the order of ignition of triac G1
÷
G4 controls is rotated in such a way to
partition evenly in time the use of all heating elements.
G1
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