Hello!
I seem to have "developed" a problem tonight. I just removed my old manual thermo and labeled the wiring accordingly. It looked the heat hot came into a spot labeled "4". Then it was jumpered to Rc. So when I hooked up the Hunter programmable 44360, there was already a jumper between Rc and Rh. So I hooked into Rh with what was the "4" and left it jumpered. It looked like everything went all right, switches in back correct, other wires correct, etc. I programmed it and when it kicked in, the heat (gas furnace - Armstrong) AND my outside central air unit ran. To remedy it, I unhooked the jumper to the Rc for now.

My longwinded questions are; how did I hook this up wrong, is there likely something wrong with the new Hunter, and MOST importantly, will there be anything screwed up on my AC unit when it ran for 13 minutes in 25F degree weather.

Thank you in advance. Mark

Usually there is a 24 volt AC transformer in the furnace with the secondary winding connected to a red wire running to the thermostat and a blue wire, common, to the gas valve, A/C relay, and fan relay. From the thermostat there will be white wire to the gas valve, yellow to the A/C, and green to the fan. The thermostat is wired to switch the power from the red to the white, yellow, and green as needed with the blue completing the circuit. Most thermostats and furnaces have the contacts labeled R, B or C, W, Y, and G for the corresponding wire colors. It may be wired to have the A/C control wires return to the furnace and its controls and then a second wire goes to the A/C unit. Internal wiring may replace the green wire if the thermostat does not give you the option of fan only or continuous fan. Digital or programmable thermostats may need the blue wire connected to them. They often have a separate RH and RC for 2 transformer installations. For one transformer, you jumper them.

Check your thermostat against the above. I don't have ''4'' figured out. Go down Heating and cooling a few threads and somebody else is struggling with it. Maybe between us, we can figure it out. I am just another homeowner that has figured out his own stuff.

Running A/C when it is too cold can cause problems. My guess is that if you didn't kick off the breaker, the crankcase heater may have saved you.

Thanks Labman. I think by applying "logic" I figured it out. What blew my mind is that I said "I will just unhook the jumper to the AC (leave the "4" just to Rh)and it will not work. Wrong. So looking into to it, I noticed that the blue (labeled y1 from the old thermo) was hooked to y1 on the new. Y1 on the new is for the heat pump compressor. "Y" on the new one is for the AC compressor. So I put the jumper back in btwn Rc/Rh and moved the blue wire to "Y" instead of "Y1" and that seemed to take care of it. Thx

Hello, I have a trane system heating and air conditioning. It is electric. My thermostat went out. I have 8 wires to my old thermostat can I use a hunters digital thermostat.

[QUOTE=proudgrandma1o1;2504253]hello, I have a trane system heating and air conditioning. It is electric. My thermostat went out. I have 8 wires to my old thermostat can I use a hunters digital thermomostat. There isn't enough places to hook all my wires up but the manual say I don't have to hook them all up. What wires do I hook up.

I have a trane system heating and air conditioning. My thermostat went out. I have 8 wires to my old thermostat. My hunters digital thermostat does have that many hook ups. It says in the manual I don't need to hook them all up. But I have hooked them color coded and I can't get it to work. Would you please help me?

Hi, this is a heat-pump unit and a standard Hunter thermostat will not run this unit right. The connections that are R/C and R/H are jumpered for a single transformer unit and this type of stat is not correct to properly run a heat-pump as they need more wires to run the reversing valve, heat strips, that a regular a/c, Heating unit will have 4 to 5 conductors. You have emergency heat yi for first stage of cooling, w, for 1st stage of heat and w1 for 2nt stage of heat and so on, so get a Hunter programmable heat-pump thermostat, so all will work properly. I believe the fellow that installed this stat on his heat pump has heat the way he wired it, but no 2nt stage or emergency heat and the a/c will not work properly as the reversing valve will not be energized in the summer. Get a heat-pump stat so all will work as it should. The R/H and R/C terminals are for gas furnaces, not a heat pump. R/H stands for Red heating and Red cooling.
Sincerely, Shastalaker7