Built your own split system?

[Xringer]

I think the indoor unit uses an AC motor on some of these M/S systems. My Sanyo uses a DC 280 volts, 47W brushless in the indoor fan. At least that's what the label says on the replacement motor.

But the two motors in the outdoor unit (fan & compressor) have their own DC controllers.
I think they might work like the brushless motors used in RC airplanes. (but don't quote me on that)! https://youtu.be/bCEiOnuODac
Anyways, both motors use feed-back from some type of speed (RPM) sensors to control their speeds, and the main-board CPU sets those speeds based on feed-back signals from the outdoor & indoor unit temperature sensors and the indoor thermostat.

In other words, it's not simple to run the hardware without some smart firmware..
I would like to learn more about how these things work, but I've got way too much other stuff on my plate these days.

Cheers,
Rich