Yes, another "C" wire question!


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Old 03-09-17, 06:22 PM
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Yes, another "C" wire question!

Hello, I'm sure you guys are sick of seeing questions about "C" wires but I need some help.

I have a 1993 Goodman Furnace and also central air. model number GMPN060-3 REV B. I'm replacing a generic crappy thermostat with a Honeywell Lyric T5. I have four wires coming into my thermostat, plus a fifth blue wire that is UNUSED.

I can obviously use that blue wire for the "C" wire but I'm not sure where to connect it on the furnace board. Here are some pictures of the wiring/board etc.

Thanks for any help! - photos are attached!

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Old 03-09-17, 06:41 PM
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You're supposed to give us harder things to answer.

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That white wire that is connected to that blue wire is sending C out to the condensor.
While the yellow wire is sending 24vac out on the red wire when the compressor is running.
 
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Old 03-09-17, 07:03 PM
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Thanks for the help! I'm rather dumb when it comes to HVAC. So which wire do I have to tap into?
 
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Old 03-09-17, 07:10 PM
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How about the one in the blue circle marked C.
Take the wire nut off and add your blue wire to that connection.
 
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Old 03-09-17, 07:11 PM
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Sorry, I figured that. Just wanted to make sure.
That wire will provide constant 24V correct? Not just only when th condensor is on?
 
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Old 03-09-17, 08:31 PM
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Yes...... that C connection combined with the R connection yield full time 24vac.
 
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Old 03-09-17, 08:41 PM
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Oh, so I need to connect my blue wire into that circled wire nut and ALSO into that red/yellow connection?
 
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Old 03-09-17, 08:45 PM
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No....sorry. Didn't mean to confuse you. The R (red) wire is already at the thermostat. It is like the + half of the circuit. The C (blue) wire is like the - half of the circuit.

You just need to add the C connection and you're all set.
 
 

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