Thermostat wiring - problems and potential hazard? Nest

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Old 02-04-13, 05:44 AM
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Thermostat wiring - problems and potential hazard? Nest

I have a Goodman GMNT060-3B furnace, Aprilaire Media 2200, and a Goodman Condensing unit CKL30-1F.

I was having difficulty installing my new Nest thermostat with no great help from the Nest support. My old thermostat was a LuxPro psp511. It had the wires G, Y, W, B connected to it. There was no R wire running to the thermostat, but there was a jumper cable between Rh and Rc. The nest would not work. Said stranded wire was the cause. Switched it to solid wire with no luck.

I later notice that the thermostat B wire was in fact connected to the R wire tedrminal on the Furnace. I switched it to the R slot on the nest and, voila, it worked. Has been working great for past 24 hours.

I am wondering why it was ever connected to B in the first place? Will this pose a problem for my system?

Thank you for your assistance! Happy to provide as much info that may be needed.
 
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Old 02-04-13, 06:38 AM
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I don't understand why B was wired up on the Lux, where R should of ?? But you got it working now.
 
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