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Old 03-04-2012, 01:18 AM   #1
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AC wiring question?


Hello All,

I have some real confusion in regards to the wiring for our air conditioner (split system) and would like some insight. This is straight ac with a heat strip.

The air handler/heat strip is in the attic, while the condenser unit is outdoors of course.

Anyhow, there is an 80amp breaker(for ac) in the outdoor "entrance" load center that supplies power to a subpanel in the attic.

1) One breaker in the subpanel is an 80amp dp that supplies power to two 60amp built-in air handler breakers? The two 60amp breakers are double wide with single type throws. One should be for the blower whereas one should be for the heat strip, correct? However, shouldn't these two 60amp breakers be fed with adequate wiring and a 120amp subpanel breaker?

2) The other breaker in the subpanel is a 40amp dp that goes outside to the condenser disconnect. Again however, you have 80amp and 40amp subpanel breakers that are fed/protected by a single 80amp, main load center breaker? Shouldn't they be fed/protected by 120amp breaker? Maybe not 120amp, given the condenser will never run while heat is on...

In short:
80amp main load center breaker (feeds/protects AC subpanel)
AC subpanel has two breakers in it, an 80amp dp and a 40amp dp.
(The 80amp breaker feeds two 60amp built-in air handler/heat strip breakers.
The 40amp breaker feeds the outside condenser).

I would appreciate some clarification, as otherwise it would seem the wiring and/or breakers are not matched properly?

Thanks


Last edited by Ralph III; 03-04-2012 at 01:40 AM.
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Old 03-04-2012, 04:48 AM   #2
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AC wiring question?


My first thought is ever add up the breakers in your main panel? they will come out to a number a lot higher that the main breaker.

Second, when dealing with a/c units just because it has an 80a breaker the wire may be much smaller, For example 8 AWG.

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Old 03-04-2012, 06:35 AM   #3
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AC wiring question?


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Last edited by zappa; 03-04-2012 at 08:32 AM.
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Old 03-04-2012, 06:39 AM   #4
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AC wiring question?


Quote:
Originally Posted by Ralph III View Post
I would appreciate some clarification, as otherwise it would seem the wiring and/or breakers are not matched properly?

Thanks
Dunno, doesn't seem right to me unless unless both strips are never supposed to be on at the same time.

I would run this one past the folks in the HVAC section and see what they think.
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Old 03-04-2012, 10:52 AM   #5
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AC wiring question?


What does the manufacturer recommend for breaker and wire size? This is what is supposed to be followed when installing the system. The manufacture specifications. Why not take a look at the product literature and the product nameplates?
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