Comment by no_time
19 hours ago
>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 lifespan. Maybe they are programmed to overshoot/undershoot the set temp to prolong lifespan?
Disclaimer: I know next to nothing about how ACs work beyond the very basics.
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.