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Old 06-12-2009, 10:22 AM   #1
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Coil resistance of compressor relay


Ten ohms sound about right?
With coil impedance at 60 Hz, it pulls ~1A from the 24vac 'former?
Thanks in advance.

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Old 06-12-2009, 05:37 PM   #2
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Coil resistance of compressor relay


Too low.

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Old 06-12-2009, 05:49 PM   #3
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Coil resistance of compressor relay


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Originally Posted by beenthere View Post
Too low.
That's what I thought, but now the whole thing is working.

Had 24vac into the sending end of the control wires to the outside compressor,
20vac out when the receiving end was open-circuited
but zero when connected,
and zero current flow when connected. . .?

It was a bad wire nut connection outside that my HVAC guy made years ago. It came apart in my hand.
For these symptoms the connection must have been acting like a very high resistance.

I should measure the coil AC current while everything is still ticking. Getting contactor coil specs off the Internet seems pretty difficult.
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Old 06-12-2009, 05:55 PM   #4
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Coil resistance of compressor relay


Thet're not generally published.
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