The breaker and wire size will largely depends on the power consumption (W) of the air-conditioner. 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 Circuit Breaker Size. last updated – posted 2016-Jul-11, 4:21 pm AEST posted 2016-Jul-11, 4:21 pm AEST User #318206 460 posts. 1. 6 Why Does My GFI Breaker Keep Tripping? Bummer. Kevin, the issue is not what size circuit breaker you should install, the issue is to make sure that the installed circuit will be exactly what the air conditioning unit is specifying which in this case is a 30 amp 230 volt circuit. Check whether the 16 Amp good Quality Top plug is used or not. The 30 amp circuit requires #10 AWG wire or 10/2 cable that will be protected by a 30 amp circuit breaker. The voltage range for this wire falls between 0 volts and 2,000 volts. If it keeps tripping, then something is wrong! 2.5kW air-conditioner will draw somewhere around 0.6 - 0.7 kW of electricity. The final cable size will depend on the derating factors applied for the installation. What size wire and circuit breaker do we need? A 5 ton air conditioner will need a two pole 40 amp circuit breaker to supply 240 volts over a cable of #8 copper wires. I always thought you choose the wire size by the mca of the unit and then use the max breaker size. The wire run one way will be 15ft. All mini splits require a dedicated circuit. Take a look at the Lennox air conditioning condensing unit tag on Page 19. What’s unusual about this number on air conditioner data plates is that it often doesn’t jive with the chart I listed above. the air conditioning units work for 2 months then all of a sudden a issue arises where the supply blows. Breaker size should be what is recommended in the AC manual. As for the disconnect. If there is a dedicated circuit that is 240 volt and the new air conditioner requires 110-120volts then the existing circuit may be converted from 220-240 to 110-120 volts if the amperage rating is the same for the existing circuit as the required power for the new ac unit. Currently I have a 220v, 30 amp breaker with 10 AWG Romex. This is a 2-ton air conditioner, as you can see from the model number. Arc quenching is much faster; The duration of the arc is same for all values of current. While trying to justify a 40 amp circuit breaker for my 5hp, 3 phase, 240 V air compressor I came across a chart of unknown origin that called for 2x the FLAs of the motor, which is 13.9 according to the motor data plate. The size of the circuit breaker is determined by the manufacturer, and should be listed on the nameplate. It depends how far over the rating is, but the basic idea is the breaker (and the wiring it protects) can handle the inrush current from the air conditioner compressor coming on. I recently purchased a ductless mini split and am trying figure out the correct breaker and wire size. For instance, your 30-amp circuit breaker will trip if your AC is drawing in 40 amps. The breaker or fuse ahead of the air conditioner only protects against short circuits and ground faults. Here’s a picture of an air conditioner’s data tag that I took just today. Use 10 awg for 30 amp unit or 6 awg for 60 amp unit. 2. 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. Air Conditioner Circuit Breaker Keeps Tripping – Reset Your Air Conditioner’s Circuit Breaker (ONCE, and ONLY once!). Water heater wire size. The maximum size will be clearly labeled on the compressor label. Well, an air conditioner usually trips the breaker because it's pulling in more amps than the breaker is rated for.That is, if you have a 20-amp breaker and the AC pulls 30 amps, the breaker trips. 2.5sqmm will carry 25A unenclosed.in air. Cable size should be as per the Australian Standards (AS 3000 and AS 3008). Hi all, Building a new home and the air con … This is the way I figure it when the nameplate rating is unknown... 1-ton equals 12,000 BTU's = 10 amps. posted 2016-Jul-4, 11:43 pm AEST O.P. These rating are adequate for runs of up to appx 60 ft In your case, the circuit breaker should be a 20 ampere HACR breaker. In the example below, it’s 60 amps. A 4 and 5 ton air-conditioner will likely need a circuit breaker rated 45-50 A connected with 8-10 AWG wire when supplied with 197 – 253 volts.. Is much faster ; the duration of the air conditioner ’ s 60 amps from 15 to 45.... 3008 ) correct size wire and circuit breaker will trip if it is pulling in more amps your! 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