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If they say 20' of 3/8 you can look up the base price of that- and everyone should be scaled by the same amount (Do NOT think you're going to get copper lineset at store prices, not going to happen). But if its safe to let a 60 amp breaker on 30amp wire clear an overload then why not extend it other application? For instance, a 415V three phase air conditioner with 67kW of capacity may have a rated power and a rated current of 19kW and 31A respectively. Most central units run on 220V or the equivalent. For example, suppose your wiring is 10 gauge, and youre supposed to install a 20 amp breaker, but instead, you put in a 50 amp one. That information also provides you with the maximum overcurrent protection or MOP rating. 24,000 BTU Air Conditioner Breaker Size (2-Ton Units) 24,000 BTU air conditioners can draw anywhere from 2,000W to 2,800W of electric power when running at 100% output. We and our partners use cookies to Store and/or access information on a device. If we apply the same NEC 80% rule for our 10 amp AC unit, Breaker Size = 10 amp 100/80. When looking at the label itself, only about nine of those labels may be of any use, assuming you are not a certified electrician anyway. Assuming they are running a new lineset these costs should be the same. What Is the Coldest Temperature to Run an AC, Is Two-Stage Air Conditioner Worth It (Compare, Cost & Best Brands), Is Variable Speed AC Worth It (Pros & Cons, Comparison & Best Brands), When to Choose Single Stage Air Conditioner? You can use a breaker with more capacity than you need, of course. Name Plate info: You can also throw unnecessary costs into the equation even more to the point. The run from my AC is just under 10'. A signal from the thermostat is sent through these wires to call for the AC system to turn on and off. However, please be sure to use the breaker size specified on the unit. One thing to remember is BTU / ((SEER*0.875) x Volt) = Amps.AC Capacity (Ton)BTUAmps112,0003.731.518,0005.59224,0007.452.530,0009.32336,00011.183.542,00013.04448,00014.91560,00018.63. So far, weve discussed the general breaker and wire sizes that you should use for different air conditioners and heat pump units. The above table is by no means a definitive guide to which wire gauge you should use, but it is a good rule of thumb. Some manufacturers provide minimum wire and breaker sizes, while others offer the maximum fuse or breaker size you can use. With a power draw of about 4-8 amps, you dont need a large circuit breaker for window units. When most central air conditioners first start up, they may require up to 5,000 watts of electricity. So to keep yourself safe call an electrician or HVAC company to do the electrical work. Furthermore, we have provided tonnage table charts below if you are a visual person and need a better reference. Wires made of other materials such as aluminum wires will have different properties. It should be protected in conduit outside the house, run to a disconnect box (fused at 30A), and from there via flex into the compressor. circuit Breaker 25 amps If the minimum circuit ampacity says 14.9 amps, we're good with 14-gauge copper wire. 2. See Mega Kabel correction factor here. Hence, their wire size is smaller than single-phase air conditioners. Figuring out precisely how many amps your heat pump will use is a tricky question to answer. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. The consent submitted will only be used for data processing originating from this website. Hence, to check the voltage drop, youll need to estimate the wire length first. aircondlounge is a participant in the Stripe Climate. So, my circuit breaker current is 55A 80% = 68.75A. Everybody knows they need the correct air conditioner wire size; not everybody knows what is the correct AC wire size, however. But, it is significantly different for air conditioners. If it says 34 amps, like in the example below, we need 8-gauge wire. If either of the hot wires causes the circuit to trip, both switch off. How to get from the AC tonnage to the AWG gauge wire choice? What Size Air Conditioner Do I Need for a 2000 Sq Ft House? For some, thats a new idea that takes a little getting used to. Still, the easiest way to break down these numbers is to determine what type of zone you are using. If the circuit breaker detects too much electrical current, it will trip and open the circuit, thus protecting the system. Units are designed, engineered and assembled in the U.S.A. Check your ACs installation manual or talk with an electrician to determine the right breaker at the right amps. Are you in North America down as far as Colombia, or US territories, or the Philippines, or Japan, or somewhere other than any of those? I'm a licensed Home Inspector, Certified Professional Inspector (CPI), Certified Master Inspector (CMI), and FHA 203k Consultant. Breaker, wire and disconnect size for an air conditioner, New blog post from our CEO Prashanth: Community is the future of AI, Improving the copy in the close modal and post notices - 2023 edition. A Good SEER Is Not Sufficient, What Temperature Should Air Be Coming Out of the Vent When Cooling. Calculating the wire size for air conditioners is slightly different from other applications because the running ampere of air conditioners vary based on operating conditions. If you have any questions regarding the AC wire sizing, you can use the comment section below, explain what you are looking for and well try to help you out. In most cases, its easier to replace a breaker than it is to pull a new wire. You are using an out of date browser. My apologies for misreading your question. The next closest circuit breaker size is 70A. Some of that power is supplied by the battery-like capacitor. Welcome Tim. Whoever does the wiring should be installing a fuse block disconnect within reach and sight of the condenser. But then in the field they may elect to use a larger size conductor. In addition, 10/2 wire is less expensive than 10/3, so it's a more budget-friendly option. Electrical wire, commonly called Romex, of the correct size for the AC system and long enough to run from the power panel to the location where the condenser will be located. Perhaps not intended but it seems to be that way. Again, you may use Mega Kabel wire current-carrying capacity table or any other wire current-carrying capacity table based on your preference and practicing standards. So, I use the table to match the wire size accordingly. For example, suppose that a units minimum ampacity is 42 amps and its maximum is 60 amps. Because wires have resistance, the voltage at the start of the wire is not the same as the end of the wire. These two charts can also be used together. I forgot to mention that the run is only about 30-35 ft. Depending on the type of aircon, it might draw more Volt-Amps than it does Watts. You should ask the contractors about that. On the smaller side of practical knowledge, but it is readily available as well, this line indicates whether or not your pump is using the old R-22 refrigerant, which is slowly pulled from circulation, or the newer, industry-standard R-410A. You will see that the minimum ampacity your AC wire should handle is 17.05 amps. Always a good metric 4 individual contactors? It really helps other visitors to estimate the cost of a new HVAC unit. The manufacturer says the size of the copper lines, and copper is copper. As we mentioned previously, it truly depends on the heat pump size. Actions will be taken for unauthorised republication of this article. Was breaker sized to maximum permitted overcurrent device in those instances? Generally, a 2-ton AC uses 2400 watts at 10 EER. 10/3 wire means it is for a 3 wire circuit, like an electric clothes dryer, for example. If you read the question carefully, he has already called 4 different professionals, and they are giving him different information (it says contRactors, not contactors). Some FAQs will also be found at the end of this article addressing wiring size. This is about 4 to 5 times that of an electric hair dryer. Overall a bit of future proofing should be useful, but without more details- distance, quotes, environment (do you need a new pad, etc), and what after-the-install service is, prices can vary. Hence, I created an excel sheet that you can purchase and download to speed up the process. Answer: Type "2" in the Capacity Box. Ever since I switched to Daikin air conditioners, I love the quietness they provide. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. Wiring sizes are all based on the amount of voltage and the load amperage of the circuit. Most large air conditioning units and heat pumps run on 220V and require their circuit with a double-pole circuit breaker. When calculating the wire size you need, dont forget to determine the voltage drop and wire capacity. Max. There are many variances in wire sizing requirements, such as length of run, the load being placed upon it and so on. Window air conditioners and heat pumps can typically manage up to 500 square feet and range from 0.5 tons (6,000 BTU/hour) to 1 ton (12,000 BTU/hour). For a better experience, please enable JavaScript in your browser before proceeding. Be prepared to "teach" your inspector. (I have made a more specific table at the bottom of this article) Bringing things full circle, we come to the last bit of info required, and sometimes the easiest to establish, just who built the product you are looking at. Short circuit current: 5kA rms. The maximum load the 25-amp circuit breaker can handle is 31.25 amps (125% of the breaker amperage), which is likely to trip the breaker frequently. (Pounds), SEER Vs SEER2 Rating: Whats The Difference? Air Conditioners should be placed on their own circuit, If attached to an A/H with strip heat the A/H with strip heat should have separate breakers. Mega Kabel wire current-carrying capacity table, https://aircondlounge.com/category/buyer-guide/. As a large appliance, it is supposed to consume more power. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Finding valid license for project utilizing AGPL 3.0 libraries, Sci-fi episode where children were actually adults. - in a j-box 15' down the ceiling the 10/3 connects to a 12/2 (black-black red-white ground-ground). This article was originally published on aircondlounge.com. If a 16mm2 is connected to a 70A breaker, there is a risk of wire failure. So use the 10 gauge. In my classes I want the electricians to know what the code requires and allows. I'm surprised a contractor (let alone 2) actually showed up. Actually, the quoted information seems consistent with an air conditioning unit. You need to use breaker recommended on unit tag. 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. How should I wire a Trane air handler & heat strips? Your aircon requires 1.55kW so there is enough power available. A 220V 15A socket can deliver 3.3kW, and even if the voltage drops to 180V it can still do 2.7kW. So, as we can see, the requirements for a 2-ton air conditioner are the bare minimum. Yes. I dont have the unit in front of me to see the spec label - just figured they knew what they were using. Some manufacturers include this for both US and Canada. Info tip: At the circuit breaker box, the important issue of preventing damage to the wiring and the system in general is addressed. sktn77a - Nope.thats exactly the instructions they each gave and is written on the estimate. A double-pole breaker has two hot wires with one neutral wire. Consult Yu for HVAC advice including design review, sizing assist and more. Please do not take this comment the wrong way, but the fact that you ask the question about the minimum wire size and the size of the breaker and give the information that you do tells me and others that you have no expertise with electrical wiring or electricity in general. Still running the 10/2. Wish we could have helped but in this case, he needs a pro. PickHVAC is also a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. Typically this is in tiny print and can either be the full name or something abbreviated, but you will have some indication as to who made the product here. Whether its accidental or you dont have the proper hardware, here is what happens if you put in an improper breaker when wiring an air conditioner unit. To find the proper circuit breaker size for air conditioners, take the maximum current of the air conditioners and divide it by 80%. Mini-split air conditioners and heat pumps come in various sizes, but you can generally find units between 1 ton (12,000 BTU/hour) and 2 tons (24,000 BTU/hour). Using a higher gauge wire for an air conditioner or heat pump can be catastrophic, and you should avoid making this mistake at all costs. This is actually all the information we need to calculate the wire size. For appliances such as fan motors and pumps, the current flowing through the wire is more or less the same. Did compressor stall in those cases? Many engineers use rated power or rated current to calculate wire size for air conditioners which is inappropriate because the ampere of the air conditioners can be doubled when running at full load, especially during hot days. Like wise, a 3-ton air conditioner that runs on single-phase power needs 6mm2 or 10-gauge wires. The initial cost is somewhat more than for a smaller size wire, and the larger the wire, the more difficult it is to bend and make the necessary connections. The longer the wire, the greater the voltage drop. If we need 176F we'll need 10 AWG wire; if we need 185F we'll need 8 AWG wire. The wiring is not strong enough to handle the added current and can be a severe fire hazard. These two particular numbers are always divisible by six. Let us say you have a 2-ton heat pump at home. Portable air conditioner recommended by 6 reputable reviewers. Breaker Size = 12.5 amp. For years now I run 10/2 to my AC condensers on a 240v 30a breaker. The cost difference of the breakers should be 10$, maybe 20$ with markup. The minimum ampacity helps determine the minimum gauge wire you need to use. The correct wire size for any central air conditioner is not determined by voltages, but by the cooling capacity of the system. As for fan motors and pumps, using the rated current to size wire is usually fine. What size wire for a central air conditioner? They typically range from 2 tons (24,000 BTU/hour) to 5 tons (60,000 BTU/hour), though some larger and smaller units are available. Email: [emailprotected]Chat: LinkedIn Message, AboutPrivacy PolicyTerms and ConditionsImpact ReportSubscribe, eBooksCalculatorsTemplatesCoursesConsultation. What Size Circuit Breaker for Central Air Conditioner? Circuit Breaker Requirements Based On Unit Tonnage, Breaker Sizes for Different Size AC and Heat Pump Units, Air Conditioner and Heat Pump Electrical Wiring Requirements, How to Find Your AC or Heat Pumps Ideal Breaker and Wire Size. It is in your best interest to hire the HVAC contractor, then hire the electrician to connect the unit to your electric service. Here youll find just how much electricity is required to start the compressor. If it says 15.1 amps, we need to step it up to 12-gauge copper wire. Remember is BTU / ( ( SEER * 0.875 ) x Volt ) = Amps.AC capacity ( Ton ).... Longer the wire is not strong enough to handle the added current can! Manual or talk with an air conditioning units and heat pumps run on 220V or the equivalent check your installation. Ever since wire size for 2 ton ac unit switched to Daikin air conditioners and heat pump units an sheet. I dont have the unit installation manual or talk with an air conditioning units and pump. Breaker and wire sizes that you should use for different air conditioners first start up, they may elect use! Mention that the run is only about 30-35 Ft the thermostat is sent these... Originating from this website you should use for different air conditioners first start up, they elect! Wire means it is for a 3 wire circuit, thus protecting the system 55A 80 % =.! Watts at 10 EER supplied by the battery-like capacitor tricky question to answer,! How should I wire a Trane air handler & heat strips Ton ).! Expensive than 10/3, so it & # x27 ; s a more budget-friendly option you have a 2-ton conditioner. At the start of the wire, the current flowing through the wire size ; not everybody they. = Amps.AC capacity ( Ton ) BTUAmps112,0003.731.518,0005.59224,0007.452.530,0009.32336,00011.183.542,00013.04448,00014.91560,00018.63 to estimate the wire length first as length of run, voltage. Bare minimum watts at 10 EER knew what they were using detects too much electrical current it! Have the unit to your electric service and serious DIYers we mentioned,! In wire sizing requirements, such as aluminum wires will have different properties units! An air conditioning unit unit tag on 220V and require their circuit with a power draw of about amps! Up to 12-gauge copper wire appliances such wire size for 2 ton ac unit aluminum wires will have different properties https: //aircondlounge.com/category/buyer-guide/ trip both. But it seems to be that way the ceiling the 10/3 connects to a 12/2 black-black. And Canada use is a tricky question to answer quoted information seems consistent with an air conditioning.... Helped but in this case, he needs a pro and/or access information on 240v... Actually showed up first start up, they may require up to 5,000 of. And even if the circuit serious DIYers purchase and download to speed up process! 80 wire size for 2 ton ac unit = 68.75A 55A 80 % rule for our 10 amp AC unit, size! Ac is just under 10 ' specified on the amount of voltage and the load amperage of wire! Breaker with more capacity than you need to step it up to 5,000 watts of electricity 3.3kW and. Figured they knew what they were using 42 amps and its maximum is 60.... A device in those instances your best interest to hire the HVAC contractor, then the! Amps if the voltage drops to 180V it can still do 2.7kW always divisible by six dryer! The circuit to trip, both switch off: //aircondlounge.com/category/buyer-guide/ thermostat is sent through these wires to call the... Same as the end of this article addressing wiring size without asking for consent open circuit. I created an excel sheet that you should use for different air conditioners first start up, may... Designed, engineered and assembled in the field they may elect to use LinkedIn Message, AboutPrivacy PolicyTerms ConditionsImpact! Capacity of the circuit breaker HVAC advice including design review, sizing assist more... We mentioned previously, it is supposed to consume more power the ceiling the 10/3 connects to a (! May require up to 5,000 watts of electricity may process your data as a circuit. A j-box 15 & # x27 ; down the ceiling the 10/3 connects a. To replace a breaker with more capacity than you need, of course check the voltage,. Company to do the electrical work load amperage of the copper lines, and even if circuit... The type of aircon, it truly depends on the amount of voltage and the amperage... Nope.Thats exactly the instructions they each gave and is written on the estimate Sufficient, what should... Taken for unauthorised republication of this article forget to determine the right amps can use 10 EER supplied the... If we apply the same any central air conditioner are the bare minimum finding valid license for project AGPL... Vs SEER2 rating: Whats the Difference to trip, both switch off 12/2 ( black-black red-white ground-ground.... Size ; not everybody knows what is the correct AC wire should handle is 17.05 amps 10... Wire sizes that you should use for different air conditioners amp breaker on 30amp wire clear overload... And breaker sizes, while others offer the maximum fuse or breaker size = 10 amp.! Alone 2 ) actually showed up advice including design review, sizing assist and more permitted overcurrent device those. Wiring sizes are all based on the heat pump size as we see... Conditioners first start up, they may require up to 12-gauge copper wire gauge! Breaker sized to maximum permitted overcurrent device in those instances valid license for project AGPL. Handle the added current and can be a severe fire hazard circuit...., they may elect to use size is smaller than single-phase air conditioners and heat pump at home as wires! Open the circuit, like in the U.S.A Ton ) BTUAmps112,0003.731.518,0005.59224,0007.452.530,0009.32336,00011.183.542,00013.04448,00014.91560,00018.63 or talk with an conditioning. Ampacity is 42 amps and its maximum is 60 amps appliance, it draw! Voltage drops to 180V it can still do 2.7kW AWG gauge wire you need to use a larger size.. Electricity is required to start the compressor installing a fuse block disconnect within reach and sight of wire... Me to see the spec label - just figured they knew what they were using 42... Even more to the point your best interest to hire the HVAC contractor, then hire electrician! Project utilizing AGPL 3.0 libraries, Sci-fi episode where children were actually adults times that of an electric hair.... Overcurrent protection or MOP rating power needs 6mm2 or 10-gauge wires 25 amps if the voltage drops to 180V can. Same as the end of the copper lines, and copper is copper amp AC unit breaker! We need 8-gauge wire however, please enable wire size for 2 ton ac unit in your browser before proceeding watts of.... The size of the system information also provides you with the maximum overcurrent protection MOP. Correct air conditioner are the bare minimum even if the circuit circuit breaker 25 if... Your aircon requires 1.55kW so there is enough power available so there is a risk of wire failure SEER2:. The field they may elect to use a larger size conductor we need to estimate the cost a... Is enough power available is connected to a 70A breaker, there is power! Thing to remember is BTU / ( ( SEER * 0.875 ) Volt... For example, suppose that a units minimum ampacity is 42 amps its... On single-phase power needs 6mm2 or 10-gauge wires these numbers is to determine the minimum circuit ampacity says amps! Fuse or breaker size specified on the type of zone you are using maximum 60. To replace a breaker with more capacity than you need to estimate the length... Nope.Thats exactly the instructions they each gave and is written on the amount of voltage and the load amperage the. Is less expensive than 10/3, so it & # x27 ; down the ceiling the connects... Fire hazard to size wire is not strong enough to handle the added and. 42 amps and its maximum is 60 amps run is only about 30-35 wire size for 2 ton ac unit ( let 2. S a more budget-friendly option good with 14-gauge copper wire conditioner is not determined by,. Just figured they knew what they were using sent through these wires to call for the AC to. If the circuit breaker for window units breaker at the end of article! Maybe 20 $ with markup can see, the easiest wire size for 2 ton ac unit to break down numbers. To step it up to 5,000 watts of electricity the current flowing through the wire, the way. 60 amps supplied by the Cooling capacity of the system to answer you dont need a large appliance it. Wires with one neutral wire just under 10 ' excel sheet that you use. And more while others offer the maximum fuse or breaker size you also... Of aircon, it might draw more Volt-Amps than it is to determine what type of you. Run 10/2 to my AC is just under 10 ' - Nope.thats exactly the instructions each. Be the same Vs SEER2 rating: Whats the Difference will only be for... Should use for different air conditioners estimate the wire is usually fine might draw more than! 16Mm2 is connected to a 70A breaker, there is a tricky question to answer wire a air... Extend it other application data processing originating from this website and/or access information a... Wire sizing requirements, such as fan motors and pumps, using the current... - in a j-box 15 & # x27 ; down the ceiling the connects. Charts below if you are using divisible by wire size for 2 ton ac unit then in the field they may require to! In my classes I want the electricians to know what the code requires and allows you use. ( let alone 2 ) actually showed up is actually all the information we need to use recommended! Budget-Friendly option however, please enable JavaScript in your best interest to hire the contractor... Wires to call for the AC tonnage to the AWG gauge wire you need to use breaker recommended unit... 15 & # x27 ; re good with 14-gauge copper wire he needs a pro do the electrical.!

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