Installing Honeywell thermostat

I'd like to do this install and have selected the Honeywell RTH7600D thermostat with the auto changeover function. My MH has the Coleman Mach III a/c and a suburban furnace with the following wiring; a 2 wire Red and White, a five wire Blue, White, Green, Yellow and Red and a single heavy white wire three times larger than the other wiring.

The MH to current Coleman thermostat is as follows:

MH -------------------------- Current Coleman T
2 wire Red(-12vdc(verified))-------to White
2 wire White(+12vdc)---------------to Red
---
5 wire Blue(and large gauge White)-to Blue
5 wire White-----------------------to Grey
5 wire Green-----------------------to Green
5 wire Yellow----------------------to Yellow
5 wire Red *Not Used
---
Large white copper threaded wire --to Blue

How does this cross over to the Honeywell?

MH----------------???-----------------HW
2 wire Red(-12vdc(verified))-------to White
2 wire White(+12vdc)---------------to Red
---
5 wire Blue(and large gauge White)-to Blue
5 wire White-----------------------to ???
5 wire Green-----------------------to Green
5 wire Yellow----------------------to Yellow
5 wire Red *Not Used
---
Large white copper threaded wire --to Blue

Thanks,
Sam

Thanks for the info. After pulling the cover off again, one of the pins broke off (planned obsolescence, I'm sure. So, I took the thermostat back for a refund. Not happy with Honeywell's tech help :(. I really don't like companies that export jobs overseas to save money. Not many choices of good American companies anymore, but I still won't be buying another Honeywell product.

OK, I have checked my notes and I installed this same t-stat last weekend. From what I see, Old Bisquit has the correct info. Since you are not getting heat you need to identify the two wires that go to your heater. I had a 4 wire cable to the AC, 2 wires to the furnace and an additional single white wire for the ground. My heat was the 2 wires. You should have one that is +12v which should connect to the t-stat R terminal. The other should connect to the W terminal. Be sure that the t-stat is switched to heat and you should be good to go. I found that the factory default configuration settings were correct.

Hope this helps, if not the your fallback is to reconnect the old one for heat until you get things figured out.

One last thing - This is all making the assumption that you put batteries into the new thermostat and that it really is working.

Let us know if this is not helping. Feel free to PM me if you want to double check any of the details.

Terry

The Honeywell stat is just as compatible as any of the others, it's just that the person you were talking to in Bangladesh doesn't know what a RV is.

Moved from Forum Technical Support

Coleman-------------------------Honeywell
RED.............................R (Rc--jumper)
Blue............................Not Used (tape off end)
White...........................W
Green......High A/C Fan Speed
Gray.......Low A/C Fan Speed
Yellow..........................Y

Connect Coleman Green to Honeywell 'G' for Hi Fan
Connect Coleman Gray to Honeywell 'G' for Lo Fan
Install a mini switch Green to one side, Gray to other side......then wire from output side of switch to Honeywell 'G'

Switch J on back needs to be set to HG (not HE)

'B' and/or 'O' on Honeywell not used unless you are wiring for heat pump

Did you download the instructions from the internet?
If I remember correctly there is something to do with the two AC fan wires that need to be connected correctly. But that should not interfere with the furnace operation. If you have no furnace, then you have something wired incorrect. What model H-D thermostat do you have? Is it battery powered or get it's power from the house? It must be a battery powered unit.

It has been a few years since I installed my unit and it's far away in storage so I cannot check. However, I 'think' I recall that the old stat had a high/low setting that the Honeywell does not have so you will be left with an extra wire??? I just hooked up the high speed blower wire to the stat. There was a post a long time ago about putting in some sort of extra switch to take advantage of both speeds....

Hi flashgor_99,

I just did this myself last weekend. I don't remember which model Honeywell I used but can check later tonight when I get back there. I do know that the furnace hookup was easy, I am still not sure I got my AC correct but am not worried about that right now.

I will check later and give you some updates but the furnace portion should be easy.

Terry

Might try putting the old one back in temporarily.