topic Re: Need Help in Replacing Honeywell ChronoTherm III T8601C with nest thermostat in Nest Thermostats

Replacing Honeywell ChronoTherm III T8601C with nest thermostat

Honeywell_sk — Mon, 12 Jun 2023 05:18:18 GMT

Sorry. I know it is duplicate. Posting it again as I was not able to reply in my previous post under different profile.

In existing Honeywell ChronoTherm III T8601C (with wires R, G, B, W, Y ) . White wire is connected to O terminal , Yellow wire is connected to W terminal. Also W and Y and connected using jumpers. I want to replace this with Nest. Need help with wiring.

Update: I have Heat pump model CPE30-1AB Goodman heat pump. Very Old Model but runs geat...running for 30th year.

pl help with the wiring.

Nest terminals are as shown in pic

Need Help in Replacing Honeywell ChronoTherm III T8601C with nest thermostat

Shan_K — Mon, 12 Jun 2023 04:53:50 GMT

Update: I have Heat pump model CPE30-1AB Goodman heat pump. Very Old Model but runs gr8...running for 30th year.

Nest terminals are as shown in pic

Nest thermostat terminals

Re: Need Help in Replacing Honeywell ChronoTherm III T8601C with nest thermostat

Shan_K — Mon, 12 Jun 2023 02:42:18 GMT

I was not able to start conversation as reply button was disabled. So I am Updating my original post by replying to my post: I have Heat pump model CPE30-1AB Goodman heat pump. Very Old Model but runs gr8...running for 30th year.

Nest terminals are as shown in pic

Re: Replacing Honeywell ChronoTherm III T8601C with nest thermostat

Patrick_Caezza — Mon, 12 Jun 2023 21:57:39 GMT

@Honeywell_sk

Give this a try.

White - O to */OB

Yellow - W to Y (jumper to Y not needed)

Green - G to G

Blue - C to C

Red - R to R

Re: Need Help in Replacing Honeywell ChronoTherm III T8601C with nest thermostat

Patrick_Caezza — Mon, 12 Jun 2023 22:12:24 GMT

@Shan_K

See your other post for an answer.

https://www.googlenestcommunity.com/t5/Nest-Thermostats/Replacing-Honeywell-ChronoTherm-III-T8601C-with-nest-thermostat/td-p/432815

Re: Replacing Honeywell ChronoTherm III T8601C with nest thermostat

Honeywell_sk — Wed, 14 Jun 2023 17:41:07 GMT

I will try it today

Re: Need Help in Replacing Honeywell ChronoTherm III T8601C with nest thermostat

Markjosephp — Thu, 15 Jun 2023 19:16:26 GMT

Hi everyone,

Your thread is now identical to this primary post. The main thread will be where you'll find all the updates on this matter, so we advise checking and updating it as needed.

Best,

Mark

Re: Need Help in Replacing Honeywell ChronoTherm III T8601C with nest thermostat

Shan_K — Thu, 15 Jun 2023 19:54:05 GMT

thanks @Markjosephp

Re: Replacing Honeywell ChronoTherm III T8601C with nest thermostat

Honeywell_sk — Sat, 17 Jun 2023 20:52:20 GMT

I connected White wire to terminal O/B on Nest

Yellow wire to terminal Y on Nest

Green wire to Terminal G on nest

Blue wire to Terminal C on nest

Red wire to Terminal R on nest ....

Set up Nest for cooling ... only heat come up ..indoor temp started rising

So changed wire configuration from above to as here -- connected White wire o Terminal W on nest , Connected Blue wire to Terminal C on Nest. This too caused heat, indor temp started increasing..

Help needed

Re: Replacing Honeywell ChronoTherm III T8601C with nest thermostat

Honeywell_sk — Sat, 17 Jun 2023 20:53:24 GMT

I connected White wire to terminal O/B on Nest

Yellow wire to terminal Y on Nest

Green wire to Terminal G on nest

Blue wire to Terminal C on nest

Red wire to Terminal R on nest ....

Set up Nest for cooling ... only heat come up ..indoor temp started rising

So changed wire configuration from above to as here -- connected White wire o Terminal W on nest , Connected Blue wire to Terminal C on Nest. This too caused heat, indor temp started increasing..

Help needed

Re: Replacing Honeywell ChronoTherm III T8601C with nest thermostat

Honeywell_sk — Sat, 17 Jun 2023 20:55:25 GMT

@Patrick_Caezza

connected White wire to terminal O/B on Nest

Yellow wire to terminal Y on Nest

Green wire to Terminal G on nest

Blue wire to Terminal C on nest

Red wire to Terminal R on nest ....

Set up Nest for cooling ... only heat come up ..indoor temp started rising

So changed wire configuration from above to as here -- connected White wire o Terminal W on nest , Connected Blue wire to Terminal C on Nest. This too caused heat, indor temp started increasing..

Help needed

Re: Replacing Honeywell ChronoTherm III T8601C with nest thermostat

Markjosephp — Sat, 17 Jun 2023 21:53:30 GMT

Hello there,

I wanted to stop by and see how I could help.

Thanks for looking into this, @Patrick_Caezza.

@Honeywell_sk, I see no wire connected specifically to the Y terminal from your old thermostat, only a jumper wire. With this, I'd suggest resetting your Nest Thermostat to its default setting and continuing the setup process. Please make sure to select the same configuration suggested above.

Once the setup is complete, activate your system and let us know how it goes.

Regards,
Mark

Re: Replacing Honeywell ChronoTherm III T8601C with nest thermostat

Honeywell_sk — Sat, 17 Jun 2023 22:57:03 GMT

@Patrick_Caezza

Connected Y G R W , Blue wire to O/B

then went to Device settings Configuration in Home App ---> thermostat > Heatpump-> Highlighted Heat pump wire to O.

This worked.

Re: Replacing Honeywell ChronoTherm III T8601C with nest thermostat

Shan_K — Sun, 18 Jun 2023 14:15:29 GMT

@Patrick_Caezza Sorry. There was a typo in my previous answer, which has worked. Below is correct wiring which worked

then went to Device settings Configuration in Home App ---> thermostat > Heatpump-> Highlighted Heat pump wire to O.

This has worked. Can you think of any issue in this wiring?

Re: Replacing Honeywell ChronoTherm III T8601C with nest thermostat

Jenelyn_O — Thu, 07 Sep 2023 15:51:39 GMT

Hi everyone,

I'm sorry for the delay. I know it's been a while already. Thanks for checking it with us — I'm glad that it's working. It looks like all the wires are connected to its correct terminal. Please monitor your Nest thermostat performance and efficiency. If anything comes up, let us know.

I appreciate your help, @Patrick_Caezza and Mark.

Best,

Jenelyn