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24 volt tester

24Volt

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6 replies to this topic

#1 Patricio

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Posted 05 January 2014 - 07:15 PM

I needed to test a contacter in a heat pump compressor & I wanted a live test so a made a jumper out of an old 120/24 volt transformer.  Alligator clips on low voltage side & 120v plug on high voltage side.   Tells me for sure if contacter snaps in & is good so I can elimnate it as a problem.   Will work for other situations that calls for 24v.


I see says the blind man, leading a lame dog, while talking to a deaf person. In other words, Not liable if you choose to follow my opinion.
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#2 acfixerdude

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Posted 06 January 2014 - 04:26 AM

I might have to find an old transformer laying around in the basement and make me one of those to test PCB relays...



#3 BryanS

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Posted 06 January 2014 - 03:33 PM

First off, all you have to do is push the plastic button on the contactor to engage it. I usually use my multimeter lead or leads to push it in. Check from one side of the 24v coil to the other side for 24v. If you have 24v to the contactor coil, the compressor and condensor fan kick on when you manually push in the contactor, then it's safe to say your contactor is bad. I've had a few contactors that were energized but voltage wasnt going through because the contacts were to pitted. Then you replace it. You can rig up a tester if you want, but I don't see the need for it for an a/c contactor.

Edited by BryanS, 06 January 2014 - 03:34 PM.


#4 acfixerdude

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Posted 06 January 2014 - 05:20 PM

I think he may be referring to testing when he doesn't have 24v going the coil. I've known a bad coil to take out a new T-Stat or fan board.



#5 wishfultech

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Posted 07 January 2014 - 06:09 PM

I built 1 of those several years ago and it does come in handy for checking things. At the time I built it I was looking for a solution for checking controls with the high voltage off.Works like a charm.



#6 acfixerdude

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Posted 13 January 2014 - 01:31 AM

I built 1 of those several years ago and it does come in handy for checking things. At the time I built it I was looking for a solution for checking controls with the high voltage off.Works like a charm.

 

Did you output 24v DC or AC?



#7 wishfultech

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Posted 14 January 2014 - 08:08 PM

24 V AC






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