Bob wrote:The only input to the Fuji controller is from the thermocouple probe in the ash. It seems to me that in order to implement a control system to avoid overshoot you would also need to sense the boiler water temperature and the rate of change of the boiler water temperature. As I understand it that would be three separate inputs being monitored. According to the specs for the PXR3 series controller there is only one input.
Yes, there is only one input. But the Fuji controller is a Proportional-Integral-Differential (PID) controller which when programmed appropriately will look at the temperature rate of change and use it for control input. A much different concept than just using it as a set point thermostat.