Could somebody help with finding C wire on my furnace


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Old 05-03-14, 08:22 PM
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Could somebody help with finding C wire on my furnace

Hi,

I got older rooftop unit, recently I've purchase Nest thermostat which one giving me only trouble.
First step to fix it would be connecting C wire from my furnace. I got spare cable but completely cant figure out where to connect it. Could somebody take a look at this schematic from my furnace and point me to right direction ? I can mail better picture of this schematic.
 
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Old 05-03-14, 08:35 PM
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Welcome to the forums.

You have a C connection there but I can't fully see it. Seeing the bottom of the schematic wold be helpful if you could reshoot it. I also sent you a PM. (private message) You'll see the link at the top of the page.
 
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Old 05-04-14, 05:51 AM
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This is bottom of schematic
 
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Old 05-04-14, 09:27 AM
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Thank you for the diagrams. I needed to confirm what I just couldn't see.

Your common is the metal case of the unit. That means you can use any screw that goes into the frame near the wiring connections.
 
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Old 05-04-14, 09:39 AM
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Thanks a lot, I'll try it soon.
 
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Old 05-04-14, 12:38 PM
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PJmax, Once again thank you, looks like I got now power in C wire, I'll hope my Nest will work now but this is another subject.
 
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Old 05-04-14, 08:31 PM
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You're welcome. If you have further questions just add them to this thread.
This way we are already familiar with your equipment.
 
 

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