a/c dead - http://www.hvacmechanic.com/ Forums
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Replies:
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| Jojo98
 |  "Re(1):a/c dead"
, posted Tue 9 Sep 23:01  
A coil read with an ohm meter should read very little resistance at all, and the meter shouldn't count down from infinity. If it's an inexpensive relay, replace and see what happens.
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| ampulman
| "Re(1):a/c dead" , posted Tue 9 Sep 17:23
When you touch the two test prods together, what does the meter read?
AM
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| | tempacc
| "Re(2):a/c dead" , posted Tue 9 Sep 17:31
It starts on infinity and moves to zero.
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| | learner
| "Re(3):a/c dead" , posted Wed 10 Sep 02:12
Hi,
Which relay did you open? Sounds like your meter was across a capacitor of sort. I'd trouble shoot why xformer smoked. Sounds like something on the secondary(24V AC) load side is dead shorted. Remove power and do a static trouble-shooting.
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| | beginner
| "Re(4):a/c dead" , posted Wed 10 Sep 17:49
"b) secondary on transformer -installed a new one, smoked."
Get yourself an inline fuse. Check where the short is. Common cultprit is the control wires to the contactor outside.
"4) I opened the relay today, set my multimeter to ohms and rx1, and placed both prongs on the coil. The multimeter did not budge from infinity. Does that mean it's shorted?"
No, it is not shorted. The coil is opened.
"How do I test the contactor coil? What else could it be?"
First remove power!!! You should get close to zero ohm or couple ohms across the coil. This is your internal resistance of the coil. If it measured infinite, the coil is opened. Get a new one.
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