Central HVAC electrical supply

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Old 01-17-17, 04:56 PM
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Central HVAC electrical supply

In my breaker panel, there are 12 single pole 20 amp breakers. There are two double pole (double 20 amp =) 40 amp breaker. One goes to the dryer. I dont know what the other goes to unless its the Goodman 3 ton central air unit. Now, having said that, there is an independent breaker in its own box/breaker panel on the side of the house, right by the outside AC unit that I always use to turn off that unit for any repairs etc.

My question is, if this is the main & only breaker for the AC, what is the other double pole breaker in the main panel for the entire house for.
Other than the clothes dryer, all other appliances are gas... stove, water heater etc.
I think it is for the central air unit outside but..... why a breaker in the main panel & one on the side of the house by the outside AC unit?
 
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Old 01-17-17, 05:11 PM
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The outside is most likely just a disconnect switch and not a breaker.

Does it look like this...
[ATTACH=CONFIG]75988[/ATTACH]
 
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Old 01-17-17, 05:44 PM
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Yes, thats what it looks like.

So, there is a breaker for the central air unit in the breaker panel for the house & a 2nd one like pictured above, correct?
 
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Old 01-17-17, 06:01 PM
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The picture above is intended to be an unfused disconnect. The breaker for the outside unit is in the breaker box.
 
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Old 01-17-17, 06:06 PM
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A double 20 is not 40A . It is 20A at 240v.

There is a two pole breaker in your panel for the outside A/C condensor.
You have a 2P20 although it's usually a 2P30A.
There is a disconnect at your A/C. It could be fused or non-fused. It only needs to be unfused.

Usually the dryer is on a 2P30A also.

If you had a heat pump with electric coils you would have another 2P breaker in the panel.
 
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Old 01-17-17, 07:51 PM
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The switch or disconnect at the unit is meant to be used to ensure the power is off when being serviced. The breaker in the panel feeds power to the unit.
 
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Old 01-17-17, 08:31 PM
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OK thank you guys! ......
 
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