topic Re: Nest Thermostat connection with only 2 wires from a honeywell??? in Nest Thermostats

Nest Thermostat connection with only 2 wires from a honeywell???

FrankR — Wed, 11 Jan 2023 02:30:10 GMT

Can't seem to find out how to connect my new Nest Thermostat using my existing 2 wire system. I only have a Red Wire and a White wire that is hooked up to my honeywell thermostat that I want to replace. Any help???

Re: Nest Thermostat connection with only 2 wires from a honeywell???

FredFlintsave — Wed, 11 Jan 2023 02:58:01 GMT

You need to get the Nest Power Adapter that interfaces between the heating system and the thermostat as the thermostat needs power and this is normally done through a C wire which you don't have.

Re: Nest Thermostat connection with only 2 wires from a honeywell???

FrankR — Wed, 11 Jan 2023 03:08:52 GMT

Fred, thank you! Would that power adapter be installed on the boiler? It is a 3 zone hot water system. Would I be putting the adapter on the zone opener??

Re: Nest Thermostat connection with only 2 wires from a honeywell???

FredFlintsave — Wed, 11 Jan 2023 03:22:53 GMT

The adapter has 5 wires and goes by the boiler, the W wire goes to the zone valve, two wires go to the transformer for power and the two go to the t-stat. The book that comes with the adapter is very well written and has simple diagrams that show how to interface it. I put velcro on the back and stuck it near the zone valves on the joist.

Re: Nest Thermostat connection with only 2 wires from a honeywell???

FrankR — Wed, 11 Jan 2023 03:24:21 GMT

Thank you again Fred!!

Re: Nest Thermostat connection with only 2 wires from a honeywell???

Houptee — Wed, 11 Jan 2023 15:29:47 GMT

You can either pull new 5 conductor thermostat cables to each tstat and connect a real C wire.

Or get a power adapter but each zone/Nest will need its own adapter.

You need to know where the R+ and the - Common is on the boiler transformer to wire it correctly.

Re: Nest Thermostat connection with only 2 wires from a honeywell???

EdwardT — Sat, 14 Jan 2023 03:24:25 GMT

Hi folks,

@Houptee and FredFlintsave, thanks for the help!

@FredFlintsave, how's it going with your Nest Thermostat? Still need our help?

Thanks,

Edward

Re: Nest Thermostat connection with only 2 wires from a honeywell???

EdwardT — Tue, 17 Jan 2023 03:25:18 GMT

Hi FredFlintsave,

It's me again. I wanted to check back in to see if you have other questions and concerns. Feel free to let me know if you do.

Thanks,

Edward

Re: Nest Thermostat connection with only 2 wires from a honeywell???

EdwardT — Tue, 17 Jan 2023 03:25:40 GMT

Hi FredFlintsave,

It's me again. I wanted to check back in to see if you have other questions and concerns. Feel free to let me know if you do.

Thanks,

Edward

Re: Nest Thermostat connection with only 2 wires from a honeywell???

FrankR — Tue, 17 Jan 2023 18:29:54 GMT

Hi Fred, decided to go with the GEN 3 NEST instead of the newest one out. The Gen 3 works with 2 wires. Just needed the RH (red wire) and the W (white wire) connection. Much easier to hook up, no C wire needed.

Frank

Re: Nest Thermostat connection with only 2 wires from a honeywell???

Jake — Tue, 17 Jan 2023 19:11:13 GMT

Hey there,

I am glad to hear you got your device set up. I wanted to check in with you, and see if you had any further questions from here. Please let me know, as I would be happy to take a closer look.

Best regards,

Jake

Re: Nest Thermostat connection with only 2 wires from a honeywell???

Jake — Fri, 20 Jan 2023 17:40:39 GMT

Hey there,

I wanted to check in, and let you know that I will be locking the thread in 24 hours.

Best regards,

Jake