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Old 06-26-2011, 12:23 AM   #1
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New doorbell transforming overheating...


Why is my new doorbell transformer hot or overheating. The new transformers is a variable type. It has three wires, one black, one white and one green. I connected it color for color simple right!!! After hooking it up, I also tested it for proper operating voltages, and it tested ok it ranged from 10v to 26v. The doorbell button and chime are disconnected I don't get it. I did mine at my house and everything went smoothly. Please help!!!

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Old 06-26-2011, 12:56 AM   #2
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New doorbell transforming overheating...


Not to dis you ,but xfmrs always feel hot in service.What is hot to people is normal to transformers.

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Old 06-26-2011, 01:11 AM   #3
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New doorbell transforming overheating...


Yes quite true !
temps of 40 to 50 degrees celsius is normal.
So how hot are we talking ?
If it is just stinking hot,
then there may be shorted turns,
But normally transformers do run quite warm,
almost hot.
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Old 06-26-2011, 01:15 AM   #4
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Originally Posted by bobelectric
Not to dis you ,but xfmrs always feel hot in service.What is hot to people is normal to transformers.
I'm just worried that it may catch on fire. When I did the installation on mine at home. I connected the black and white wires only to the transformer, and left the ground disconnected because there's no ground wire there in the box to connect it to. I replaced everything, button, transformer and chime. And everything is fine, but when I went over to my cousins house to try to replicate this it's not having it. My transformer is cool to the touch and his is extremely hot...
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Old 06-26-2011, 01:27 AM   #5
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New doorbell transforming overheating...


did you check to see if you have some jahovah witness guys waiting on you to answer the door?
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Old 06-26-2011, 08:06 AM   #6
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New doorbell transforming overheating...


Are both transformers variable?
The output voltage reads good, did you check the input side? Just to make sure the connection is correct, measure the input side for 120V.
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Old 06-26-2011, 08:52 AM   #7
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New doorbell transforming overheating...


You'd know within seconds if the voltage was wrong!
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Old 06-26-2011, 09:05 AM   #8
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You'd know within seconds if the voltage was wrong!
You and I know this but to lay out a troubleshooting path, it has to be done. What if.... it is connected to an unbalanced MWBC?
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Old 06-26-2011, 12:46 PM   #9
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Are both transformers variable?
The output voltage reads good, did you check the input side? Just to make sure the connection is correct, measure the input side for 120V.
I checked the input before I installed the transformer, and it read 120v. I noticed the wires that connect to the transformer are located on the other side of the main breaker box is that ok????
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Old 06-26-2011, 08:41 PM   #10
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New doorbell transforming overheating...


One of the doorbell buttons may be stuck. Doorbell transofmers should not be running current except for the brief moments that someone is pushing a button.
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Old 06-26-2011, 09:42 PM   #11
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I checked the input before I installed the transformer, and it read 120v. I noticed the wires that connect to the transformer are located on the other side of the main breaker box is that ok????
I don't know exactly what you mean by other side of breaker box.
It is entirely possible the transformer is defect. When you say the button and chime are disconnected, do you mean there are no wires connected to the low voltage side of the transformer?
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Old 06-26-2011, 09:53 PM   #12
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New doorbell transforming overheating...


Before you go chasing a phantom problem, confirm that you actually have a problem. As many have already said, transformers get hot. Even with no load connected at all, it may get almost too hot to touch. How do you know it's hotter than it's supposed to be?
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Old 06-26-2011, 11:02 PM   #13
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Before you go chasing a phantom problem, confirm that you actually have a problem. As many have already said, transformers get hot. Even with no load connected at all, it may get almost too hot to touch. How do you know it's hotter than it's supposed to be?
Yeah nothing is connected to the low voltage side. The only thing connected is the transformer!!!
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Old 06-27-2011, 01:43 AM   #14
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New doorbell transforming overheating...


Quote:
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Yeah nothing is connected to the low voltage side. The only thing connected is the transformer!!!
Transformers still use some current with no load connected (it's called the "magnetizing current"), and thus get hot. The more compact and cheap the transformer, the greater the heating from magnetizing current.
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Old 06-27-2011, 06:39 AM   #15
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New doorbell transforming overheating...


I am led to believe that a transformer that gets too hot to touch is so cheap that it will not last very long and has a good chance of becoming a fire hazard.

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