(brewblox) tuning ferment cool pid tips

The current fermentation fridge wizard does not use a fridge setpoint driver anymore and drives the actuators based on the beer temperature with 2 PIDs directly.

For a HERMS a setpoint driver actuator to drive the HLT setpoint works best. You can load the preset for a hlt setpoint driver for a PID with the HLT driver as output.

I recommend a Kp of mash volume divided by HLT volume. A Ti of 20 minutes and Td zero. Also add a 10 degree maximum constraint on your setpoint driver so the HLT will never get more than 10 degrees above your mash setpoint.