Wiring help-Nest thermostat E

[Nicklearns]

Hey everyone I have a Honeywell 8 wire and want to connect a nest thermostat E which wires should I connect? 

 

 

[CoolingWizard]

The 2S wires are for a remote sensor that you will not need with this nest. So basically you got a five wire solution. And it looks like you have a heat pump. It looks like you have a white wire on auxiliary heat, and a blue wire on your emergency heat.

The AC Cooling Wizard

[Nicklearns]

Thank you!

So where would I put the emergency heat if there is already a wire going in the o/b slot on the old thermostat?

[CoolingWizard]

Use the nest install ion app and list your wires as:

Rc

O/B

G

Y

Aux

E.  
the installation configuration tool will set up the nest thermostat software and tell where to put each wire.   

I would be curious to see the air handler to check how the Auxiliary versus the Emergency are configured. Some older thermostats use an E (emergency) Heat linked to the same Auxiliary Heat strips.  The difference is the heat
Pump is not activated.  In emergency mode the blower fan and the heat strips are activated. 

The AC cooling Wizard. 

[Patrick_Caezza]

Your current thermostat is only compatible with the Nest Thermostat E if you don't use the blue wire connected to the E terminal. I would check the terminal block on the control board in the furnace/air handler and verify if the blue wire is, in fact, connected to the E terminal. If it isn't, you can then use it to create a C wire.

Give this wiring a try.

Black - S to Not Used

Brown - S to Not Used

Yellow - Y to Y1

Green - G to G

Orange - O/B to */OB

White - AUX to W1 (set as AUX Heat)

Blue - E to Not Used

Red - R to R

If you find that the Blue wire is connected to the E terminal at the furnace/air handler end and you want to have the option of using the Emergency Heat function, then you will need the Nest 3rd Gen Learning Thermostat.

[aatienza]

Hey Nicklearns,

Checking in — we hope you've got the answer you're looking for. Let us know if you have more questions in mind.
 

I appreciate the help, CoolingWizard and Patrick_Caezza.

Thanks,

Archie

[Nicklearns]

hey everyone thank you for your help, I got everything wired up and it seems to work except the nest dies in about a day then I have to plug it in. Is there something wrong with the nest itself or is there another issue that I’m not aware of? 

[CoolingWizard]

Nick, 

since you no longer require the two wires being used for the sensors,  (S), then I would suggest repurposing one of those two wires as the common that will assist in keeping the thermostat charged up. This will require you to have access to the air handler. Turn the power off to the air handler.. Then find that black wire for example, disconnect it from the cable going outside, locate the C terminal on the air handler‘s integrated control board, attach the black wire to the C terminal. Then go to the Nest thermostats, remove the display, locate the black wire and insert it to the C terminal. Turn power to air handler back on.  

The AC Cooling Wizard

[Nicklearns]

Hey guys the best is not giving me any sort of heat when I have it wired up 

Black - C

Yellow - Y to Y1

Green - G to G

Orange - O/B to */OB

White - AUX to W1 (set as AUX Heat)

Blue - E to Not Used

Red - R to R

[Nicklearns]

 

[Jake]

Hey there,

Thanks for the help CoolingWizard.

Apologies for the delayed reply. I wanted to follow up and see if I could be of any help. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further. 

Best regards,
Jake

[CoolingWizard]

If you are not getting heat, then what you probably have is what they call a B model heat pump. In which case you must energize the OB wire to get heat. Your system defaults to being a cooling system, and must therefore have the reversing valve energized, using the OB wire in order to get heat. There is a setting in the thermostat of the equipment where you can change the function of the reversing valve. 

The AC Cooling Wizard

[mdphill]

Hooked up the nest Thermostat and when it is set to heat is is putting the A/C on. Im in MN and its snowing right now. We have forced air (gas furnace not electric) We have 5 wires. We don't have a heat pump

[CoolingWizard]

@mdphill 

you need to start over and open your own thread to report your problem or ask for some help. You’re posting in somebody else’s thread right now, and that’s not proper procedure. When you open up your request for assistance, do yourself a favor, upload the pictures of the old thermostat, and as it was wired, upload a picture of your Nest, back plate, showing how you have it currently wired. 

The AC Cooling Wizard

[Jenelyn_O]

Hi there,

I hope you get all the answers you're looking for. Please let us know if you have any questions or concerns. 

@mdphill, please provide the information mentioned above, so we can assist you further. 

I appreciate your help, @CoolingWizard, @Patrick_Caezza, Archie, and Jake. 

Best,

Jenelyn

[Markjosephp]

Hi mdphill,

I'm checking back in — how's it going? Still need our help?

Regards,

Mark

[Dan_A]

Hey there,

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 need assistance or want to discuss topics, feel free to start a new thread.
 

Cheers,

Dan