Nest gen 3 thermostat

[MJS112155]

Can my Nest gen 3 thermostat replace a round honeywell thermostat used for heating only?

[Houptee]

Yes it can you just hook up R and W and if you have a C wire best to hook it up. The Learning Nest is supposed to be ok without a C wire but they work better with one it keeps battery charged.

[MJS112155]

Thanks and what is the C wire? And what is the allowable voltage for a Nest?

[Houptee]

C wire is Common from the 24 volt AC transformer in the furnace.

Its like the Negative on a battery.

R wire is positive

The Learning model usually works without the C wire but the other Nest models all require it to work.

[EdwardT]

Hi folks,

@Houptee, thanks for the help!

@MJS112155, how's it going with your Nest Thermostat? Still need our help?

Thanks,

Edward

[Markjosephp]

Hi MJS112155,

I wanted to see if you still needed help. Please let us know if you have any other questions or concerns.

Regards,

Mark

[MJS112155]

If I connect the nest without c wire will the battery still get charged?

[Markjosephp]

Hello MJS112155,,

In most cases, Google Nest Learning Thermostats can charge their built-in battery using the heating and/or cooling wires. But there are situations where they may need to connect the Nest Power Connector or a common or C wire to consistently deliver power to the thermostat.

Please have a look at this article and let us know if you need more help.

Thanks,

Mark

[Markjosephp]

Hi there,

I'm checking back in — how's it going? Still need our help? Let us know so we can assist you right away.
 

Regards,
Mark

[EdwardT]

Hi MJS112155,

I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns as I will be locking this in 24 hours.

Thanks,

Edward