Nest Gen3 Install with a bypass Humidifier

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  #1  
Old 12-08-18, 12:55 PM
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Nest Gen3 Install with a bypass Humidifier

I'm attempting to find a wiring diagram to install a Nest thermostat on a carrier electric furnace with a bryant heat pump/AC. The house also has a totaline bypass humidifier.
Like most I have been reading about I'm having a problem figuring out how to eliminate the humidstat. There are two wires at the humidstat but it already has a relay. I guess my confusion is I though the relay was to eliminate one of the wires but in this config I have a relay and two wires. One wire goes from the humistat straight to the humidifer and the other goes to the relay. The other wire going to humidfier is twisted together with several other wires. I'm thinking this is the common wire suppplying power to humidifer slenoid.
In this scenriio do I still use one wire at the nest and do I still connect that one wire to the *.

Thanks,
Mike
 
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Old 12-08-18, 01:22 PM
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Welcome to the forums.

Post a picture of your existing thermostat and wiring.
You'd only need a relay in the humidifier control path if the unit had a built in 24vAC transformer.
So we need the mode number from the humidifier.

How-to-insert-pictures
 
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Old 12-08-18, 01:52 PM
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The model number of the humidifier will be tough. I have look all over the unit and can't find anything except the name. Installed last year by the previous owner. Pictures to follow.
 
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Old 12-08-18, 02:15 PM
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Uploaded files. Hopefully these are good after meeting size requirements. Seems the third photo showing the wiring is not going to help. Too much detail and the file size requirements has made it useless. Anyway the brown wire from humidstat plugs into the relay. From the relay it gets connected to several wires with a wire nut and one lead from the same wire nut runs to the humidifier. Black wire from the humidstat goes straight to the humidifier.

Found the sticker laying on the floor behind the water heater. Humidifier model P110-LBP2417
 
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Last edited by newcyclist; 12-08-18 at 02:43 PM.
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Old 12-08-18, 04:06 PM
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The attachment system takes fairly large pics. Not portraits. If the pic is anywhere near 1500x1500 or so pixels..... or smaller.... it will be resized and posted. The board will only display 625w x 800h pictures.

C - blue -----------> C
O - orange -------> O/B
W2 - white --------> W2/AUX
R - red -------------> Rh
G - green ---------> G
Y - yellow ---------> Y1

You will not be able to select Emergency heat manually.

One of the yellow solenoid wires goes to C.
The other yellow solenoid wire needs to go to the * terminal on the nest.
 
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Old 12-08-18, 05:37 PM
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Are you saying I shouldn't be able to select emergency heat now or after switching to the Nest?
Thanks

As for the attachment size. Once clicking advanced -> then the attachment button it states 600x280 max size 19.5k. I didn't read down far enough to see jpg at 97k.
 

Last edited by newcyclist; 12-08-18 at 05:56 PM.
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Old 12-08-18, 06:39 PM
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There is one AUX function supplied by the nest. It's controlled thru the * connection.
If you use that function for the humidifier.... there is no way to manually select E heat with the nest.
 
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Old 12-09-18, 04:41 AM
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Thank you. My last house had Emergency heat. Never used it. Even if the heat pump quit working doesn't the furnace pick up the task automatically?
 
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Old 12-09-18, 04:52 AM
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It only uses auxiliary heat when the room temperature falls behind the setpoint by a certain amount.
The Nest is a poor choice for a thermostat, especially for a heat pump. Adjusting the setpoint without locking out the auxiliary heat can actually increase your electric bill.
I’ve made countless service calls where the Nest has caused problems that resulted in equipment breakdown.
 
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Old 12-09-18, 05:33 AM
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roughneck77, Do you have good recommendation? My last house had a similar setup. Non-programmable thermostat and a seperate humdistat. The entire system was Lennox so I bought a Lennox programmable thermostat. It had an outside sensor so I could lockout the aux heat all together when the outside temp would allow the heat pump to totally handle the task. It also handled the bypass humidifier. Sometimes it took longer but it was nice to have full control of the system. It only took a couple weeks to zero in on the target temps that required aux heat.
 
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Old 12-09-18, 05:54 AM
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Both Honeywell and Ecobee make superior products that will control your heat pump much better. You
 
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Old 12-09-18, 09:25 AM
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Honeywell's website is not very helpful. Can you recommend a Honeywell that does all of the mentioned functions. stages, humidity control, wi-fi, and retain emergency heat function.
 
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Old 12-09-18, 10:13 AM
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Look at the Honeywell Vision Pro 8000 series.
 
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