Thursday, December 3, 2009

FAQ: Switch Between Heating & Cooling

Q: How do I switch DZ into heating or cooling mode?

A: For cooling, values of P and I for the PID controller associated with the thermostat have to be positive, for heating, negative.

IMPORTANT: Make sure that P and I values for all thermostats are on the same side, and that they are synchronized with the operation of the actual HVAC device, or you will have a runaway condition in zones that are on the wrong side. In other words, your HVAC will run forever.
Q: Why is it so complicated?

A: Because it makes things much, much simpler in the bigger picture, the time for which hasn't come yet - but I'm working on it.

Are you ever going to make it so normal people can use it?

A: Yes.

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