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Old 12-01-2011, 12:00 PM   #1
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Wiring for Rona Eco Friendly Programmable Thermostat

I am trying to replace my thermostat. The wiring at the Carrier furnace end is G -green wire, Y/Y2 - Yellow wire, R-red wire, W/W1-white wire, Black wire hooked to Com 24v. At the thermostat I have green to G, yellow to Y, White to W/b/o. That leaves red and black and the Rc and Rh connections. When i connect red to Rc and black to Rh i get the fan running but no heat kicks in, and when i connect black to Rc and red to Rh i get heat but the fan wont run if set to on. only when the furnace is blowing heat. Suggestions? We dont have an air conditioner but i think it may be wired for one as this is a new house. Do i need the jumper between Rc and Rh? But then where would black wire go?


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Old 12-01-2011, 12:28 PM   #2
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this is a confusing mess. first of all does the Rona tstat have a C terminal? not all do. standard wiring is leave the rh-rc jumper on the tstat alone and hookup r from the board to it. y to y, g to g, and C on the tstat if it has it to C on the board. IF NOT then the tstat has to run off its batteries ( no problem as they usually last 2-3 yrs) and you leave the black wire alone/taped off and stuck back in the wall and remove it from the board.

I am NOT a fan of those generic no name tstats from CTire/Rona etc etc. usually lower grade offshore imports. only one I recommend is the Honeywell Focus Pro and you can get them at Rona/CTire/HDepot. That one has a C terminal and can use your black wire and not need battery changes.


"Cut it twice and it is still too short".

Last edited by yuri; 12-01-2011 at 12:32 PM.
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Old 12-01-2011, 10:28 PM   #3
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Thank you so much! There is no C so I think I will just return it and get one that will use 24v power. Have a great day!
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Old 12-01-2011, 10:51 PM   #4
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Rc-Rh get the jump and RED wire goes to either R terminal NO BLACK that's the other side of the TR in the air handler dead short.....keep in mind the FAN cycle is controled within the furnace module board or heat disc..not the stat as in cooling.if you can't hook up C for a constant 24Vs at the subbase then its batteries every couple of years
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