Nest 2.0 and GSHP
Last Post 02 Nov 2012 09:45 AM by joe.ami. 9 Replies.
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cschmelzUser is Offline
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25 Oct 2012 05:55 PM
Well with the Nest 2.0 coming out supporting 3 stages of heating and 2 of cooling I jumped and finally installed one. First off, the install is a piece of cake with their new connector/backer. Took about 10 minutes total including registering the device on my WiFi. I think this is going to be a good device. I bought it less for setback than I did hoping it would have better (and hopefully improving) logic for looking at the outdoor temperature (which it gets via the internet), the performance of the system over time (delta temp over time compared to outside conditions), and keeping the run times longer and in lower stages than the old honeywell I had. So far, so good! I have the same set point as before and set the heat pump balance to "max energy savings" (versus balanced or 'max comfort'. My comfort hasn't changed but it is doing longer run times than before and doing them less frequently which is clearly ideal for the ground source. The first part of this graph is the run times under the honeywell (left half) right half is under the NEST under similar conditions. I've emailed them asking if they have any logic planned to learn the characteristics of the system to keep it in stage 1 for longer with setbacks (which could be a huge improvement over anything else out there)


cschmelzUser is Offline
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25 Oct 2012 05:55 PM
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Attachment: TempGraph.png

benicholsUser is Offline
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30 Oct 2012 04:23 PM
Great! Keep us updated. I just purchased 2 Nests (v2.0) to replace my Honeywells and will install tomorrow. Excited to see if the system can maximize stage 1 versus stage 2 as well. I don't have auxiliary resistance heat so the Nest won't be useful for that but hoping that the Nest logic will allow longer run times in stage 1 versus stage 2 when the weather gets colder.


engineerUser is Offline
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30 Oct 2012 11:40 PM
For about $2 one can wire a switch completely preventing 2nd stage operation.

On or about June 20 or January 5 (or whenever it gets really hot or cold, twice each year) flip the switch allowing 2nd stage "ON". Then around March 1 and / or September 1, (again, twice each year) turn stage 2 back off.

...just sayin'...


Curt Kinder <br><br>

The truth is incontrovertible. Malice may attack it, ignorance may deride it, but in the end, there it is - Winston Churchill <br><br><a href="http://www.greenersolutionsair.com">www.greenersolutionsair.com</a>
benicholsUser is Offline
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30 Oct 2012 11:56 PM
For only $2 more, you could also wire a switch to prevent stage 1! Then you could just turn it on when the temperature is less than 60 or greater than 80.


geomeUser is Offline
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31 Oct 2012 11:34 AM
For free, I go into the installer setup (in the thermostat) and disable 2nd stage. 


Homeowner with WF Envision NDV038 (packaged) & NDZ026 (split), one 3000' 4 pipe closed horizontal ground loop, Prestige thermostats, desuperheaters, 85 gal. Marathon.
PopoffUser is Offline
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31 Oct 2012 12:57 PM
What model Honeywell did you replace? I have a Vision Pro with only 3 wires connected at the thermostat, the rest of the wires connected at the module near the WF. I do have a Honeywell steam humidifier and whole house dehumidifier as well.


LoobyUser is Offline
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31 Oct 2012 05:14 PM
Posted By benichols on 30 Oct 2012 11:56 PM
For only $2 more, you could also wire a switch to prevent stage 1! Then you
could just turn it on when the temperature is less than 60 or greater than 80.

Or, for $2 less, you could adjust the thermostat setpoint to 60 or 80.



One measurement is worth a thousand expert opinions.
engineerUser is Offline
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31 Oct 2012 10:39 PM
Fair points.

I was unconsciously thinking of my zone board, whose Y2 decision making cannot be otherwise disabled, so the $2 switch nips Y2 before it gets to the system


Curt Kinder <br><br>

The truth is incontrovertible. Malice may attack it, ignorance may deride it, but in the end, there it is - Winston Churchill <br><br><a href="http://www.greenersolutionsair.com">www.greenersolutionsair.com</a>
joe.amiUser is Offline
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02 Nov 2012 09:45 AM
Thermostats have been a bit behind the curve and those with features have been pretty pricey. I've been using the Ecobees and have been pleased. They just introduced a new economy model as well. I have not had a chance to review the features.
j


Joe Hardin
www.amicontracting.com
We Dig Comfort!
www.doityourselfgeothermal.com
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