Nest help for PTAC

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Old 05-18-16, 07:50 PM
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Nest help for PTAC

So, I have a thermostat from Ice Air, which has a 10 wire configuration. Does anyone know how the wires map out to a Nest 3rd generation thermostat? Pictures attached. Thanks in advance.

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Old 05-18-16, 08:16 PM
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Welcome to the forums.

That is a specialized thermostat. We're going to need a model number from it.

Also..... a complete description of your system.... like gas furnace with A/C or heat pump with back up electric heat.

I'm thinking your in a condo or apartment with a PTAC in wall system. In that case.... you won't be able to use the nest there. You may find your stat among the ones in this link.

ice-air/wp-content/uploads/2014/05/Thermostat-overview_nc.pdf
 
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Old 05-18-16, 09:23 PM
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Yes, it is a PTAC and we live in a condo. The thermostat is the digital 7 day programmable one. Interestingly, the PTACs in some of the other rooms have a Nest which is why I think there has to be a way to do it. However, when I look at the wiring for those rooms, there are perhaps 6-8 wires and not 10 wires. Do you need the model number for the PTAC?
 
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Old 05-18-16, 11:42 PM
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Any information you can provide will help. Some PTAC's have a wiring diagram posted on a service door. That would be helpful too.

It is not impossible to use the nest but it may take relays and some specialized connections.
 
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Old 05-20-16, 09:02 PM
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Hi there, below is the model no. and other information and the wire diagram. Any help would be much appreciated. Thanks!

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Old 05-20-16, 09:06 PM
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A close up of the wire chart...

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Old 05-20-16, 11:58 PM
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Thanks for the pics. I can see the thermostat controls everything in low voltage which is a good thing. Your stat has a multi-speed fan control (hi-med-low cool). The nest cannot duplicate that. You may need to install a switch on the PTAC to select fan speed.

Most of the functions the nest can control. There are three trouble areas that I'll need to look into. They are pipe temp, room sensor, G.

red - R
black - C
yellow - cooling
green - low fan/cool
blue - med fan/cool
orange - high fan
white - H1 (heating)
brown - pipe temp
purple - G
gray - room temp

This is not going to be an easy cut and dried install.
 
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Old 05-22-16, 04:48 PM
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Ok, any advice you give would be much appreciated. However, it seems this project is really moving towards the area of having to hire a professional in order to get it done if it is that complicated. I called the manufacturer and they mentioned the need to install what I think they referred to as a relay board. Does that sound right? Thanks.
 
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Old 06-24-16, 03:09 PM
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Just trying again. Any suggestions on how I get this PTAC to work with the Nest? Much appreciated. Thanks.
 
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Old 06-29-16, 09:25 AM
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Hi KCNY2000,

I have the exact same question about an Ice-Air PTAC and 3rd gen Nest. Just wondering if you found a DIY solution or decided to go the professional installation route. Thanks!
 
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Old 06-29-16, 09:30 AM
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There is too much information missing for me to come up with a solution.
If you're talking about a nest professional installation..... I doubt many of them could even begin to help you. You need someone who knows that PTAC unit well.
 
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Old 07-05-16, 04:49 PM
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I am about to hire a Nest pro. I have shown him the pictures of the wires, etc... and they claim to have experience dealing with these PTACs and the Nest. They did warn me that I will not be able to have variable cooling speeds, but that should be fine for us.

PJmax, hope you are wrong but I guess I will soon find out.
 
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Old 08-26-16, 08:19 AM
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So our Nest Pro person came to wire up the PTAC. He did the following:

Wire Color - Terminal

Yellow - Y1
Green - G
Red - Rc
White - W1
Black - C

The fan is set at medium and all of the other unused wires were secured behind the plate. Seems to work fine so far. Hope this helps others.
 
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Old 09-08-16, 12:07 PM
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Installer info

Do you have info of the installer you used? Guessing you're in nyc.
Thanks!
 
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Old 09-08-16, 08:11 PM
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Welcome to the forums.

prknwill .... click on the members name and you'll see private message in the box. Click on that and send a PM to the member. Most members will receive an email when they get a PM.
 
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