5 TON central AC breaker requirements

Old 11-13-14, 06:49 PM
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5 TON central AC breaker requirements

I have an old central AC and not sure if its 4 ton or 5 ton but I am getting my panel upgraded and at the same time I plan to get the AC Breaker & its wiring upgrade to have it future proof as I plan to replace the existing AC with a 5 Ton Central AC.

Can anyone advise what sized breakers should I get installed (I am assuming most of the 5 TON AC's will have in same range).

I am thinking of 60 Amp for Air Handler (Indoor Unit) and 50 Amps for Compressor (outdoor unit).

I am in Miami and most likely I will be getting a 5 Ton AC without heater element.

Any help is appreciated.
Old 11-13-14, 09:14 PM
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Welcome to the forums.

You can't guess on a breaker size. Each unit has it's own specs.

You can pre-run the wiring and install the breaker when you get the unit. You can most likely use 8-2 w/ground. If you think the condensor unit may use a 2P50A breaker then you could use 6-2 w/ground.

Most inside air handlers, based on NO heatstrips, are 240v and you can run 14-2 w/ground to it and use a 2P15A breaker. You could also use 12-2 w/ground if you like to be extra sure.
Old 11-16-14, 05:37 AM
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The mfg.will specify the the min. Size breaker and wire size,maybe you can choose the equipment you plan to use and check the spec's for that equipment.
Old 11-16-14, 08:08 AM
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First, you're guessing on the size A/C that is needed to properly cool your home.
The duct system & airflow should be evaluated as this is usually a major problem area affecting cooling performance.

Do a Free whole house load-calc: HVAC Load Calculation - Maunualj - Whole House Loadcalc
Print the simple instructions & follow them; NO cheating.

When you discover the right tonnage to be used, only then you can select a unit & get the correct conductor & breaker sizes.

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