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jeff5may · 11-20-16, 10:59 PM

Nope, just encouraging others to try something similar. I bought a QD-U12A control and transplanted it into an old-school, twisty knob, ton and a half window a/c. It lives at my son's house now. He rents, and the existing HVAC system is horrible.

http://ecorenovator.org/forum/geothe...it-system.html

http://ecorenovator.org/forum/geothe...onversion.html

I haven't seen the thing defrost in person, but my son said it's purring away like it should. He says it works better than the one ton unit I had running off the Arduino and an ICP defrost control. He says he knows when it does because the fan motor turns off and it goes WHOOSH! When it terminates defrost, everything shuts off for a minute or two, then it goes right back to heating.

Besides the control board and plumbing in a reversing valve, the unit is the same as it was. The old controls unplugged and the control board plugged in. Since it has a shared motor for both fans, I didn't connect anything to the outdoor fan control relay. It's not a super-high efficiency model, but it was headed for the scrap heap before I found it due to rust and dust. If my son ever gives it back, I might experiment with it. For now, it's living its second life.

11-20-16, 10:59 PM	#6
jeff5may Supreme EcoRenovator Join Date: Jan 2010 Location: elizabethtown, ky, USA Posts: 2,428 Thanks: 431 Thanked 619 Times in 517 Posts	Nope, just encouraging others to try something similar. I bought a QD-U12A control and transplanted it into an old-school, twisty knob, ton and a half window a/c. It lives at my son's house now. He rents, and the existing HVAC system is horrible. http://ecorenovator.org/forum/geothe...it-system.html http://ecorenovator.org/forum/geothe...onversion.html I haven't seen the thing defrost in person, but my son said it's purring away like it should. He says it works better than the one ton unit I had running off the Arduino and an ICP defrost control. He says he knows when it does because the fan motor turns off and it goes WHOOSH! When it terminates defrost, everything shuts off for a minute or two, then it goes right back to heating. Besides the control board and plumbing in a reversing valve, the unit is the same as it was. The old controls unplugged and the control board plugged in. Since it has a shared motor for both fans, I didn't connect anything to the outdoor fan control relay. It's not a super-high efficiency model, but it was headed for the scrap heap before I found it due to rust and dust. If my son ever gives it back, I might experiment with it. For now, it's living its second life.