Ecobee C wire

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Old 11-17-18, 05:08 AM
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Ecobee C wire

Hi,
I have a heat only thermostat. Red and white wire connected -- but several unused wired leading down to my HVAC. I'de like to find a C wire (continuous 24v) in my electrical box on my HVAC but nothing appears obvious. I am attaching my wiring diagram. Anyone have any clue?
Thanks,
WIll
 
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Old 11-17-18, 05:38 AM
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https://inspectapedia.com/heat/Honey...tat_Manual.pdf

According to internal schematic on page 8, looks like you can use Z terminal as common.
That is the other pole of transformer output.
TV terminal should be R.

Check voltage with a multimeter in AC mode to make sure.
You should get 24V between Z and TV terminal.
 
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Old 11-17-18, 12:29 PM
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Thank you! Worked perfectly!
 
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