Speed of circuit breaker is much higher during operation of the air blast. The protective device must protect against short circuit, overload, and earth fault conditions. I recently purchased a ductless mini split and am trying figure out the correct breaker and wire size. last updated – posted 2016-Jul-11, 4:21 pm AEST posted 2016-Jul-11, 4:21 pm AEST User #318206 460 posts. A 5,500 W heater rated 240V has a rated current of 5500/240 = 22.91 amps. The device is therefore NOT sized to protect the wire against overloads. what size circuit breaker for 18000 btu air conditioner? 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. posted 2016-Jul-4, 11:43 pm AEST O.P. mlionel20. Currently I have a 220v, 30 amp breaker with 10 AWG Romex. However, if your air conditioner keeps tripping the circuit breaker, then it might be a cause for concern. posted 2016-Jul-4, 11:43 pm AEST ref: whrl.pl/ReE1JR. 6 Why Does My GFI Breaker Keep Tripping? Favourite answer. Well, trust me. 1. 8 Answers. This is the way I figure it when the nameplate rating is unknown... 1-ton equals 12,000 BTU's = 10 amps. The air conditioner must be on a dedicated circuit breaker not shared with other outlets. Forum Regular reference: whrl.pl/ReE1JR. Depending on the BTU capacity amp requirements can range from 15 to 45 amps. the air conditioning units work for 2 months then all of a sudden a issue arises where the supply blows. Size of Wire & Circuit Breaker for Electric Stove 3 How Many Watts Does a 5,000-BTU Air Conditioner Use? Circuit Breaker Size. Reset it once and only once, and see if your unit runs normally. If it keeps tripping, then something is wrong! It then says that the max breaker is 45 amps. The wire to a condensing unit must be large enough to allow the equipment to start. Table 310-16 shows that three wires of 6-gauge placed in a conduit will safely conduct 65 amperes of power. Answer Save. I only have a 20 Amp circuit breaker and it works well with the cooling of the air conditioner. The obvious first thought is that the inverter air conditioning unit itself has a major problem such as a PCB or compressor fault. 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. The 40 amp breaker would only be slightly less than 3x rule. 2.5sqmm will carry 25A unenclosed.in air. 5 Can a Refrigerator and Microwave Be on the Same Circuit? Use 10 awg for 30 amp unit or 6 awg for 60 amp unit. Bummer. The size of the circuit breaker is determined by the manufacturer, and should be listed on the nameplate. subject to … Using the wire amp rating to gauge calculator, the recommended wire gauge is 10 AWG. [Solution] If Circuit Breaker (MCB Trip) activates during operations, please check the followings. 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.. All mini splits require a dedicated circuit. Your AC circuit breaker will trip if it is pulling in more amps than your circuit breaker is rated for. 2. The voltage range for this wire falls between 0 volts and 2,000 volts. This is a 2-ton air conditioner, as you can see from the model number. The reason for this is that the unit does not require as much power to display the settings, or even run the fan, as it does to turn on and run the compressor. That said, for aesthetic reasons I'd hard wire it certainly. Included in this cable will be a #12 bare ground wire. It is not uncommon to see a 50 Amp breaker on a So you've determined that your AC is tripping the breaker, but you're clueless as to why. Actual current rating of circuit will depend on the method of installation,eg, unenclosed in air, or enclosed in conduit over 50% of its route length. 7 years ago. If possible, ask your spark to run a new circuit from your switchboard. Check whether Switch is ON and the Power is supplied. Air blast circuit breaker is small in size, because of the growth of dielectric strength is so rapid (which final contact gap needed for arc extinction is very small). 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. 2.5kW air-conditioner will draw somewhere around 0.6 - 0.7 kW of electricity. Disconnect Size. However when using the heater the demand for more electric power trips the circuit breaker and shuts off. It is an old GE window model. Breaker size should be what is recommended in the AC manual. (You can see that, right?) COVID-19 Update: To see what we're doing to help keep everyone safe, please see COVID-19 and Home Inspections. In the example below, it’s 60 amps. In your case, the circuit breaker should be a 20 ampere HACR breaker. 3. Circuit Breaker Size To determine the right circuit breaker size for an air conditioner, we look at both the minimum and maximum size allowable. 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. Types of Air Conditioners and Their Electricity Requirements Mini Split Air Conditioner Electricity Requirements. By the time the breaker is in danger of tripping the current draw has dropped down below 15 amps. Notice that the MCA is 28.6 amps and the maximum fuse or circuit breaker is 50 amps. 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