04-15-2023 09:01 AM
Hi,
I have old Honeywell chronotherm 2 thermostat (Honeywell-Chronotherm-II-manual)
but it’s just two wires (label W and B)
My gas furnace (heating only) is Payne PG8MAA purchased 2010 (Payne-Pg8maa-manual )
I was told there may be an equipment interface module (EIM) installed between the furnace and the thermostat. I donno where that is or whether that is true. If that’s true, I need a licensed electrician to remove that in order to replace my old thermostat with those new thermostat like nest. That would be more expensive that I thought. Any advise?
04-15-2023 09:03 AM
This is the Honeywell chronotherm II thermostat with 2-
04-15-2023 04:16 PM
Correction: the thermostat model is chronotherm III ( Honeywell-Chronotherm-III manual )
04-16-2023 01:14 PM
The Payne manual online has the wiring diagrams on page 23. The bottom one shows W,C,R, G, Y wire labels, and there is NO wire label B. W,C,R would be connected between the furnace (heat only) and thermostat. So the red wire on my thermostat could be misplaced and should have been connected to label R on the thermostat.
04-20-2023 12:02 PM - edited 04-20-2023 12:08 PM
Hi wilsong,
Thanks for posting here in Community forum, and I'm sorry for the delayed response. I'd love to know more about this.
Please send us a photo of your actual furnace control board where the other end of the wires are connected so I can further determine its compatibility with our Nest Thermostats.
I'll look foward to your response.
Best,
Zoe
04-22-2023 05:57 PM
Hi Zoe, thanks for your help! Here are some pictures of the furnace. Let me know if you need more information. Thanks!
04-22-2023 06:02 PM
The first picture is not clear. Resend again .
04-25-2023 09:40 AM
Hi there,
Thanks for getting back to us. Your Honeywell Chronotherm thermostat has the non standard labels that we have on our Nest Thermostat though your Payne PG8MAA gas furnace control panel follows it otherwise. In this case, it appears that your system is wired to your thermostat in a proprietary way.
Proprietary systems aren’t compatible with Google Nest Thermostats. However, some proprietary systems can be rewired by a pro installer to be compatible.
Let us know if that helps.
Thanks,
Zoe.
04-25-2023 06:22 PM
Thanks Zoe. I’m not clear. Could you elaborate what do you mean by non-standard labels?
Also, does that mean there is an equipment interface module (EIM) installed between the furnace and the thermostat? Is it installed behind the wall of the thermostat or underneath the crawl space ? Thanks.
04-29-2023 10:21 AM
Hey wilsonng,
Thanks for getting back to us. Non-standard labels are labels that the Nest Thermostat doesn't have (for instance 1,2,3, or A, B, C). Have a look at this article and let us know if you need more help.
Also, if your Honeywell Chronotherm thermostat has the non standard labels and your Payne PG8MAA gas furnace control panel has, there should be an equipment interface module or relay behind the wall.
Regards,
Zoe
05-03-2023 01:06 PM
Hey there,
I wanted to check and see if you are still in need of any help. Please let me know, as I would be happy to assist, and answer any questions you may have.
Thanks,
Zoe
05-04-2023 01:09 PM
Hello wilsong,
We haven't heard from you in a while so we'll be locking this thread if there is no update within 24 hours. If you run into any more issues in the future, please feel free to create a new thread.
Cheers,
Zoe