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Xringer · 09-02-19, 10:24 AM

Because of the DC motor design, the boards have to be 'inverter' type controllers.
But, the frequency of the controlling clocks (which controls the RPMs of the motors) will become fixed. The OEM boards vary the RPMs, thus control the amount of power being used.
My Living room Unit will use 1200w when it starts and then drop down to 470w after the room starts to cool. Then will drop to just a few watts when the room is at target temp.

Buying one of these 24k BTUh replacement boards is risky, because it might run the old Sanyo at a full 24k BTUh, sucking down full power until the thermostat shuts it off. Meaning it would work a lot like Old-Tech USA HVAC.
Not really desirable, but maybe better than nothing.
What would be great, if one could manually adjust the Fixed frequency. Make it run at RPMs in a lower power range. Like 400 to 800 watts.
Which would never deliver the full 36k BTUh heating or 24k BTUh cooling the Sanyo hardware is capable of, but it would be satisfactory for the average day.

Running this old Sanyo at full RPMs, would work. But, because it can produce almost instant cooling or heat in a large area. It might easily over-heat or cool rooms real fast. Blasting out 36,000 BTUh of heat when only 12,000 are really needed.. LOL!
(Spec on 24k Sanyo is 24k cooling and 36k BTUh heating)..

Cheers,
Rich

09-02-19, 10:24 AM	#19
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	Because of the DC motor design, the boards have to be 'inverter' type controllers. But, the frequency of the controlling clocks (which controls the RPMs of the motors) will become fixed. The OEM boards vary the RPMs, thus control the amount of power being used. My Living room Unit will use 1200w when it starts and then drop down to 470w after the room starts to cool. Then will drop to just a few watts when the room is at target temp. Buying one of these 24k BTUh replacement boards is risky, because it might run the old Sanyo at a full 24k BTUh, sucking down full power until the thermostat shuts it off. Meaning it would work a lot like Old-Tech USA HVAC. Not really desirable, but maybe better than nothing. What would be great, if one could manually adjust the Fixed frequency. Make it run at RPMs in a lower power range. Like 400 to 800 watts. Which would never deliver the full 36k BTUh heating or 24k BTUh cooling the Sanyo hardware is capable of, but it would be satisfactory for the average day. Running this old Sanyo at full RPMs, would work. But, because it can produce almost instant cooling or heat in a large area. It might easily over-heat or cool rooms real fast. Blasting out 36,000 BTUh of heat when only 12,000 are really needed.. LOL! (Spec on 24k Sanyo is 24k cooling and 36k BTUh heating).. Cheers, Rich __________________ My hobby is installing & trying to repair mini-splits EPA 608 Type 1 Technician Certification ~ 5 lbs or less..