If you have a one ton AC unit, it means it has the ability to cool 12,000 BTUs an hour. The lower two voltage ratings are common in smaller units, while units with a rating higher than 15,000 BTUs will require a 220-volt circuit. Included in this cable will be a #12 bare ground wire. The exact amps an electric furnace requires is solely based on the size of the furnace and its performance capabilities; however, typically electric furnaces require a draw between 60 and 80 amps. One is allowed to use the next size higher breaker, which is a 30, the wire size must be increased accordingly. The momentary interruption test and the cold load pickup test showed an average inrush current of 90 amperes which lasted for 117 milliseconds. Example: If the "Min." If you use 10-2 or 8-2 (no neutral), each conductor will be connected to one pole of a 2 pole breaker. And what size wire do i use from the - Answered by a verified Electrician We use cookies to give you the best possible experience on our website. is 50, I would go with a 40 amp breaker and then size my wire accordingly. Select the system type needed for your home. This is enough to cool down up to 3000 square feet home. The ac should be installed prior to any finish work from what is being said here. The electrical characteristics for my LG ductless mini split are as follows: MOP 35 amps MCA 23 amps Cooling rated amps 17.55 Heating rated amps 17.55 Compressor 17.3 amps Fan 0.25 amps There are a variety of sizes of air conditioners available that require 208/230 volts, and the specific circuit breaker and wire size is only determined when the size of the AC is known. Follow these easy steps: Select the region you live in according to the color keyed map below. You want to size the wire and breaker large enough to supply the Min. What size circuit breaker must be used for a 3.5 ton residential condensing unit? Air handler breaker sizes for both above units are max 15 amps and min 5 amps. By multiplying the … the run is about 60 feet from my subpanel. A 240 line is needed for the condenser directly to breaker panel with a disconnect at outside unit. Maybe not all the time but they will trip. They may have just installed whatever was there before in terms of the breaker rating, or the old panel had a 30A breaker and they just installed a breaker to match the wire size. If you really want to … without going over the Max. I'd probably go with a 40 amp since you won't find a 45. There will be two numbers on the name plate of the unit. A 25 amp breaker is not a stock item, nor is it readily available. In some unit bundles, the required AC coil may be larger than this condenser in tonnage. How Many Amp Circuit Breakers Are Required For A 1 5 Ton Ac Unit. If you want to run your central air conditioning we would need to install a 50 amp breaker not a 30 amp breaker. So you've determined that your AC is tripping the breaker, but you're clueless as to why. Yes this generator might power your central air conditioning unit but you are running into issues here. The out side unit specifies , max breaker size at 20 amps. A #6 Al wire typically matches a 40A breaker so I can see that happening. Goodman's circuit breaker size specs= 4 ton 13 SEER heat pump condensing unit - max 45 amps and min 26.4 amps. This means it is allowable to install this unit on a circuit breaker rated at 50 amps and a conductor rated at 28.6 amps, according to the NEC’s NFPA 70. Currently I have a 220v, 30 amp breaker with 10 AWG Romex. DIY Calculations. The system i have is 18000 btu heat and AC. Use the AC Unit sizing calculator below to calculate your required central air conditioner and heating system tonnage size. 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