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Installing a Honeywell Programmable Thermostat with my Bryant Puron HVAC System

I hope someone can assist me. I have purchased the Honeywell 7-day Programmable Thermostat, Model # RTH7500, to install for my Bryant Puron HVAC system. My system is a split unit, and has electric a/c and natural gas heating and is six years old.
The wiring on the original Bryant thermostat is a follows: 2 red wires connected to the R terminal; 1 yellow wire connected to the Y/Y2terminal; 1 green wire connected to the G terminal; 1 blue wire and 1white wire connected to the C terminal; and, 1 white wire connected to the W/W1 terminal. For the record, one of the red wires that is connected into the R terminal and the white wire that is connected to the C terminal both originate from a thicker beige/brown wire that has been stripped so the two individual wires can be separated into different terminals.
In the installation instruction guide that came with the Honeywell thermostat, it says that if you have more than one wire connected to the C terminal, you should tape the ends with electrical tape and(written in bold and underline) "do not connect them".
I have installed the thermostat but could not get the unit to cool --so I reinstalled the original thermostat (I will describe what I have done below). I can get it to the point where the fan runs and the heat works, but I cannot get it to work in the "cooling" mode.
The Honeywell thermostat has an R terminal and an RC terminal that are connected with a "jump connector". On my first attempt, I connected both "R" wires into the "R" terminal and left the jump connector in place. As described above, the fan would run and the heat would work,but it would not work in the cooling mode. On my second attempt, I thought, hmmm... one of the red wires comes from the same larger wire as the white wire that is connected to the C terminal, so maybe it would constitute the Rc wire. So, this time, I removed the jump connector and connected the first red wire in the R terminal and the second into the Rc terminal. This time, nothing. No power to the fan,no heat, no nothing. So, I switched the two around, putting the first red wire into the Rc terminal and the second red wire (the one that comes from the same larger brown wire as the white wire that is connected to the C terminal on my original unit) into the R terminal. Again, I had power to the fan and the heat would work, but the unit would not work in the cooling mode.
I have described all the wiring that is available. So, does anyone have any suggestions as to what might be my problem? In my logical,reasoning mind, it seems like this should be a simple fix -- if the old thermostat works fine in all modes, I should be able to get this new,programmable thermostat to work, too.
I called the Honeywell technical support line. The technician instructed me that I might have to go to the unit and get a detail of the wiring from the source. I went outside to my units, and I cannot find where to look for this.
I am a DYI-er and can do almost anything, but this has me stumped. Please help if possible.
Thank you,
Mary Sue

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  • msjones58 Aug 19, 2008

    I have both the Operating Manual (for which the link was posted in the response from the expert) and the Installation Guide, both of which came with my thermostat. However, as is stated in my lengthy original post (which does provide distinct details regarding my problem), these guides do not address the issue that I am having. Therefore, I would like further assistance addressing the direct problems that I have stated in my original post.
    Mary Sue


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The wiring should be the same as the old one hook up same as the old wires there is nothing diffrent

Posted on Aug 19, 2008

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I would think that the wires would connect up the same way they came off the old thermostat..i would try to do that first connect them all the same as they came off the old one and see what you get from that. it stands to reason that if it works with one thermostat wired in a certain way it should work with the new one the same way.try it and dont always have to follow directions when it comes to hooking them up

Posted on Aug 18, 2008

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