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08-07-2011, 01:10 PM #1
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Humming sound, but things seem to be working.
I've got a quiet humming sound coming from my furnace when heating and cooling systems are not running. Every thing seems to work right now. The blower turns.
There's a light-switch mounted to the side of the furnace. If I flip that off, the sound stops. It seems to be coming from the duct underneath the furnace, where I think the cooling coil is.
Anyone have an idea what this humming might be?
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08-07-2011, 01:17 PM #2
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Transformer.
An answer without a question is meaningless.
Information without understanding is useless.
You can lead a horse to water............
http://www.mohomeenergyaudits.com
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08-07-2011, 01:26 PM #3
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08-07-2011, 04:18 PM #4
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What they said.
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08-07-2011, 04:25 PM #5
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Yes.
If the transformer is terribly loud, a tech could probably try to isolate it from its mounting panel.
But, chances are this requires no further action.[Avatar photo from a Florida training accident. Everyone walked away.]
2 Tim 3:16-17
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08-07-2011, 06:27 PM #6
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OK, thanks.
Why would the system need to allow the transformer to draw energy when it's not running? It seems inefficient. Is it to avoid a time delay?
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08-07-2011, 07:03 PM #7
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The transformer is always on because power is always applied to the unit, so it is always ready to go, and power your t-stat, if it's that type. It uses very little power.
I suppose if you really want to, you can go the the unit, turn the power off, and turn it back on each time you need heat or cool."Hey Lama, hey, how about a little something, you know, for the effort." And he says, "there won't be any money, but when you die, on your deathbed, you will receive total consciousness." So I got that goin' for me, which is nice. - Carl Spackler
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08-07-2011, 07:49 PM #8
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...because you don't want to go to the unit every time you want heat or cooling.
Originally Posted by horseatingweeds
The idea is that the power is always there waiting, so the thermostat can route it correctly for the desired function.[Avatar photo from a Florida training accident. Everyone walked away.]
2 Tim 3:16-17
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08-07-2011, 07:57 PM #9
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the amount of power it uses is a blip on the radar, and i do mean a BLIP! Originally Posted by horseatingweeds
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08-07-2011, 10:30 PM #10
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As i thought about this my head began to hurt.... but your computer and its monitor probably burned more energy typing your post than the transformer will burn over the course of a week... it would be interesting to see if something more efficient could be designed... i'm gonna go lie down now and try not to think of all those cell phone chargers plugged in with no phone attached. Originally Posted by horseatingweeds
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08-07-2011, 10:43 PM #11
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The transformer powers the thermostat which is needed to turn on the system. Power consumption is minimal compared to the computer you are using right now! Originally Posted by horseatingweeds
Every problem gives us the opportunity to choose from several solutions: stupidity, ignorance, indifference, or brilliance. Which one will you choose?
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08-07-2011, 10:54 PM #12
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Someone explain this to me. How can a cell phone charger plugged in with no phone connected to itbe drawing power? What is pulling amps on that circuit?
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08-07-2011, 11:14 PM #13
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the charger its self, thats why the goverment wants you to disonect if not actually charging the phone! once you plug it in its working and sending amp/volts to the end that plugs into your phone, it cant see that your phone isn't attahed, though they might come out with one that can sense the phone is attached then it'll turn on! Originally Posted by NCHeat
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