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Xringer · 09-02-19, 09:08 PM

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

09-02-19, 09:08 PM	#21
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	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 __________________ My hobby is installing & trying to repair mini-splits EPA 608 Type 1 Technician Certification ~ 5 lbs or less..