Is a NEST thermostat RV compatible?

[speedbugy]

I know this is a old topic, but I just want to say thanks to Rick Bish. I followed your diagram and watch the video, ordered the relay, and power supply that you suggested and works great on my RV with a Coleman Mach A/C. My gas heat also works. Great job and Thanks Again.

[BParkhouse]

Rick could you please show how I could hook up the Google Nest thermostat e in my trailer? It’s the cheaper version of the nest learning thermostat. I have been searching the Internet but haven’t found someone hooking up that thermostat in their trailer. I need help please!

Edited September 21, 2021 by BParkhouse

[BParkhouse]

On 9/9/2020 at 11:48 AM, Rick James Bish said:

I did a video today of the install. I had hoped to go over the settings for configuring after the install but the display was blown out. I will record that part again and update the video. I have one installed up front and one in the bedroom.

 

Rick could you please show how I could hook up the Google Nest thermostat e in a trailer? It’s the cheaper version of the nest learning thermostat. I have been searching the Internet but haven’t found someone hooking up that thermostat in their trailer. I need help please! I have a Colman Mach thermostat right now. The Nest thermostat E has less connection spots.

Edited September 21, 2021 by BParkhouse
Misspelled

[BParkhouse]

On 9/8/2020 at 11:16 AM, Rick James Bish said:

Old topic I know but here is a diagram I made for using the Nest Learning Thermostat in a 12vdc source RV. Requires a 24vac transformer here  https://www.amazon.com/dp/B07C3J6PQX?ref=ppx_pop_mob_ap_share  and relay board here https://www.amazon.com/dp/B07DYLKH74?ref=ppx_pop_mob_ap_share .  The cost of the transformer and relay board together is less than $40 and this setup controls AC with two fan speeds and heat.

 

 

 

How would I hook the wires to this one? I was thinking I would only have a fan high and not have fan low. Where would the transformer go or would it not be compatible?

[Ranger Smith]

Transformer would go to c terminal and r terminal. It would be wired the same as the diagram above except you would not have the gray wire.

 

Im gonna install one of these Easy Touch Thermostats . . . Much easier

Edited September 21, 2021 by Ranger Smith

[Kirk W]

6 hours ago, BParkhouse said:

Rick could you please show how I could hook up the Google Nest thermostat e in my trailer?

I just checked and Rick has not visited this forum since Sept. 14 of 2020, unfortunately. He does have a YouTube channel so you may want to become a subscriber.

[Mike519]

On 9/8/2020 at 1:16 PM, Rick James Bish said:

Old topic I know but here is a diagram I made for using the Nest Learning Thermostat in a 12vdc source RV. Requires a 24vac transformer here  https://www.amazon.com/dp/B07C3J6PQX?ref=ppx_pop_mob_ap_share  and relay board here https://www.amazon.com/dp/B07DYLKH74?ref=ppx_pop_mob_ap_share .  The cost of the transformer and relay board together is less than $40 and this setup controls AC with two fan speeds and heat.

 

 

 

This relay board is a great product, but the max current recommended is 10 amps, which is too low from a safety point.  In rush current from a compressor could be 2x that amount and the relays should be over rated to keep from pitting the contacts, and creating resistance on the contact connections.

[Ranger Smith]

Those relays are just acting as a switch. They are not the ones that carry the higher current. All they do is tell the system what to turn on. ust like the switch in the thermostat itself. It is just a closure.

[speedbugy]

The relay carries 24v to thermostat and 12v to the system. Required if you want a/c and r/v 12v heat.

[IFlyEm]

So I'm having an issue with my Nest not recognizing the white wire. I don't have the learning version.  Just the basic Nest.  Currently I have heat only.  I have it set up identical to the diagram attached with the inverter and relay board.

My wires are:

Inverter Terminal 1 - R

Inverter Terminal 2 - C

Heat - W

The thermostat powers up and I have done the setup but it says no wire detected in the W connector.

I'm guessing it's sensing potential between the white wire and the neutral?  Should I swap the terminals on the inverter?  Or is there something else I'm missing?   

 

I notice on the Google Power Connector for 2 wire they run one AC leg through the white wire and the other one through the red wire.  Though i think if I do this it will not allow the relay switch to work correctly.    I'm definitely open to suggestions.

Thanks!!

 

Edited October 8, 2023 by IFlyEm

[jenkinsgroup]

On 9/9/2020 at 1:48 PM, Rick James Bish said:

I did a video today of the install. I had hoped to go over the settings for configuring after the install but the display was blown out. I will record that part again and update the video. I have one installed up front and one in the bedroom.

 

 

On 9/8/2020 at 1:16 PM, Rick James Bish said:

Old topic I know but here is a diagram I made for using the Nest Learning Thermostat in a 12vdc source RV. Requires a 24vac transformer here  https://www.amazon.com/dp/B07C3J6PQX?ref=ppx_pop_mob_ap_share  and relay board here https://www.amazon.com/dp/B07DYLKH74?ref=ppx_pop_mob_ap_share .  The cost of the transformer and relay board together is less than $40 and this setup controls AC with two fan speeds and heat.

 

 

 

Can this work with a 3 wire system?