Reply To: Corruption with r34 (heating curve)

Hello again.
I _think_ I have found the root cause. Since I’m manipulating the r34 (curve) from Node-red, I give the pump small r34 to delay the heating and bigger r34 to start heating faster / more. It plays with the r34 set value all the time to control r19 integral speed, and when the pump runs, tries to overheat with higher r34.

Like I said I have typically the “base” curve set to 23-25 (depending on things, inside temp, outside temp etc) which is the “reference” for those conditions, and then the price control uses -3..+3 offset to that depending how we want to control the r19 integral behavior. When pump runs, I have allowed -2..+2 offset to base curve value.

My curve min and max were set as 22 and 40. And when I commanded r34=21 to pump, I think it got underflow in the pump (21<22 (minimum), and it set the curve r34 to 40 in pump firmware. I now put the min curve in the pump to 20, so this underflow should not happen anymore. I’ll keep monitoring how it behaves.