Early-On with two stage heating?

[bob01b]

Have a new "Nest Thermostat" and a gas fired air furnace with two stages of heat.  Works fine so far but question how Early-On will work.  Will it use stage 1 (low fan, less burners) or use stage 2 (higher fan, more burners).   This would be first thing in the AM when house was set at 62 for the night and is set for 69 in the morning.

[bob01b · Accepted solution]

Answered my own question.  This AM it started an hour early (as I had set as the maximum time), it ran at low heat (lower energy use) for an hour and was not yet up to the target temp.  Then it kicked into high heat (2nd stage) and ran in high until my target temp was reached. 

[zunkman]

I just took the dive into a 2 stage gas furnace and mine is not working like yours.  My techs did not put a wire on W2.  Do you have a wire on W2?

[bob01b]

My wiring is:

C - blue

R - red

W1 - white

W2 - green

G - yellow

I used the app for direction and transferred the wires from my old thermostat.

Hope this helps

[zunkman]

It certainly helps a lot.  Thanks so much!!!

[zunkman]

My new Nest 3 doesn't seem to be learning Early On too quickly.  I have it set to go from 65 overnight to 72 at 7:15, and I gave it a 1 hour limit.  It waits until about 6:40 or so, and then kicks on Stage 1. By 7:15, the temperature in the house has only made it to 67 or 68 degrees.  Exactly one hour after it starts Stage 1, it ramps up to stage 2 until the house hits 72 degrees.  This is obviously not the best scenario.  My thermostat is almost 3 weeks old, and I'm just wondering how long it will take Early On to start working "properly."

[zunkman]

Found some information on Google Support that I think may apply to this situation.....

"When Time-to-Temperature won't appear

• Time-to-Temperature estimates will only appear for temperatures that you've manually set with the thermostat or the Nest or Home app. Temperatures that you've put into your schedule and temperatures added by Auto-Schedule won't have a Time-to-Temperature displayed."

It's not exactly the answer, but I can't help but think it's somehow relevant.