Testing humidifier transformer

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Old 12-02-18, 09:14 PM
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Testing humidifier transformer

Hello, I have this transformer that came with my whole house humidifier. I think I may have burned it out somehow but want to confirm that my testing method is correct before buying a new one. I have a multi meter, I should get a reading, expecting 24v with this transformer, by just touching the leads to the two screws correct? I got a 0 reading there, also got a 0 reading from wrapping the wires coming out of the transformer around the leads. I confirmed the multimeter works with a 120ish reading from the outlet.
 
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  #2  
Old 12-02-18, 09:29 PM
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Welcome to the forums.

Yes..... it's blown out. Many of those transformers don't have protected secondaries (24v) so if you short it..... it's gone. Some will take very brief shorts before expiring.
 
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Old 12-03-18, 04:56 AM
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Double check to see if the transformer power supply outputs AC or DC. This should be engraved on the outside of the module or printed on a label.

Some meters will read zero when set for AC measurements while being used to measure DC.
 
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Old 12-03-18, 05:08 AM
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Assuming the receptacle had 120 volts on it then the transformer is dead.
 
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Old 12-03-18, 05:36 AM
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All, I appreciate the feedback. I was messing with the wiring configuration before realizing that I had to adjust some of the non-electrical components to have unit work properly. At one point the transformer got really hot which I would guess is when it burned out. I've attached another image. Would you all have any idea which two recepticals the red wires need to go in? (One red wire comes up from the transformer and another comes down from the humidistat. Two white wires are attached with a wire nut.) The instructions and wiring diagram are not super clear about this particular step. My first thought was one in the top half and one in the bottom. I tried every configuration and don't remember which one caused the transformer to get hot.

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Last edited by PJmax; 12-03-18 at 10:10 AM. Reason: labeled picture
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Old 12-03-18, 10:04 AM
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Since it's AC..... the order or color of the wire is not critical. A very basic series circuit.
Use the outer two connection holes on the solenoid.

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Old 12-03-18, 12:50 PM
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Thanks again for the help, much appreciated!
 
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