Help Connecting my Nest (2nd Gen) to my AC/Heater and Humidifier

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  #1  
Old 12-04-14, 07:27 PM
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Help Connecting my Nest (2nd Gen) to my AC/Heater and Humidifier

Hi,
I am new to this forum. I though I would post my question using this thread.
As I said I have a 2nd Gen Nest that want to connect to my AC/Heater and the Humidifier.

I have not problems with the connection to the AC/Heater it should be straight forward into my Nest. My question is with the connection to the Humidifier.

If I understood correctly I need to put the White wire from the Humidifier into the "C" on the Nest and the Red wire into the "*".

The humidifier is an Aprilaire Model 560
24V - 60hz

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I have attached some pictures to make it clearer. Thank you.
Jeff
 
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Last edited by PJmax; 12-04-14 at 10:16 PM. Reason: enhanced/reoriented t'stat image
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Old 12-04-14, 10:08 PM
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Welcome to the forums.

I started you off in a new thread of your own.

You have a basic set up. Your solenoid has two yellow wires on it as seen in the following picture. One needs to get to the C terminal on your furnace and one needs to connect with the * terminal on your nest. Since we are working with AC voltage.... there is no polarity between the yellow wires or whatever color wire you use to extend them.

You will no longer be using the manual humidistat so it should be taken out of the circuit.

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In looking at your old t'stat..... you have four colors connected to your thermostat.
old t'stat --- > nest
Y = yellow ---> Y1
G = green ---> G
R = red ---> Rc
W = white ---> W1

You'll connect the blue ---> *

This is important.... at the furnace the blue will go to the humidifier. It DOES NOT get connected to anything inside the furnace. The other solenoid wire goes to the C terminal inside the furnace.

Make sure you turn the power off to the furnace while changing wiring, make sure you see a C connection inside your furnace at the terminal strip and if you have any questions... ask before you start wiring.
 

Last edited by PJmax; 12-04-14 at 10:30 PM. Reason: updated stuff
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Old 12-05-14, 08:14 AM
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Post the make and model of the humidifier.
Many humidifiers have an internal transformer.
It appears that this may be the case here.

An isolating relay may be required.
 
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Old 12-05-14, 08:20 AM
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The humidifier is an Aprilaire Model 560 (24V - 60hz)
I'm pretty sure I've identified the unit correctly. It's an Aprilaire 560.

aprilaire/docs/default-source/product-owners-manuals/humidifier/aprilaire-humidifier-model-560-owners-manual-obs.pdf
 
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Old 12-06-14, 12:13 PM
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ftp://ftp.aprilaire.com/Fulfillment/..._list_176B.pdf

Kinda hard to tell from the pics..

I see nothing in the pictures showing a connection between the humidifier and the furnace transformer.

I would investigate a little further to verify the 24 volt power source for the humidifier before connecting it to that expensive thermostat.
 
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Old 12-07-14, 10:00 AM
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Connect Nest to Humidifier AprilAir 560

Thanks Houston204 and PJmax,
I am a bit confuse.
You said to connect one of the yellow wires (from the solenoid) to the "C" on the furnace and the other one to the "*" on the Nest.
But then you also indicate to connect the Blue (currently disconnected) to the "*" on the Nest.
Could you clarify that?
I am pretty new to this stuff, where is the "C" on the furnace? I have attached more pics about my furnace.
BTW, I am working with zone 1. I already did zone 2.
Thanks again,
JeffKish
 
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Old 12-07-14, 10:41 AM
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That's more than just a furnace. That's a zone control system. The primary thermostat will be controlling the humidifier.

What's the model number on that zone controller ?
 
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Old 12-08-14, 09:19 AM
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Yes, I know. I was trying to find the "C" on the furnace you mentioned in your first reply.
The zone controller is a: TrolATemp MABS-EZ2.
Yes, I already have a Nest controlling ZONE2. It is Zone 1 the one I am trying to connect right now.
What about the connection to "*" on the Nest? What goes in there?
Thanks,
JeffKish
 
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Old 12-08-14, 11:35 AM
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The following diagram should help you.

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Old 12-08-14, 12:56 PM
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So M1 will end up with two inputs. The current one (I believe for the damper) + the Humidifier. Yes?
Thanks.
 
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