2 ms·

>Mapping out your own PID correction algorithm I want to do this but I'm worried about stressing the compressor with extra start/stop cycles would shorten its

• acyou 12d ago
  Yeah, you can cause it to short cycle for sure. But you can also get better control without excessive short cycling. If you're worried about short cycling, just include that in the control algorithm. Short cycling would be bad in the sense that the motor frequently turns on. The maximum current is during motor start and the maximum motor coil cooling is when the fan is running at high speed steadily. So if it starts a lot and doesn't run much at high speed you might tend to overheat, sure. That would definitely drastically reduce the motor lifespan. If you are still starting periodically and running for awhile, you can see where this goes. I think it's not overshoot/undershoot that is happening so much as delayed kick on.
  • briHass 12d ago
    One of the biggest benefits of modern minisplits over conventional split systems (like are still common in America) is that their compressors are variable speed inverter types. This allows them to slowly ramp up to speed without the massive inrush of current. That said, it's still a mechanical device that can experience stresses caused by cycles. Refrigerant systems also deal with gas/liquid phase changes and high pressures, so most units I've worked with do have a compressor lockout timer that allows a few minutes for temps/pressures to stabilize before kicking the compressor back on.