The wire sizes and recommended amperages in this article are all based on general installation practices and codes. Pursuit the truth and learn the fundamental ways to approach the chilled-water system. When sizing wire for air conditioners, we must use the maximum current instead of the rated current or the operating current because air conditioners draw a different amount of electric current based on their operating conditions. Online registration is not required in California or Quebec. Luckily, you can find this out pretty quickly with all of the above information and by looking at a label on your compressor unit. Some manufacturers provide minimum wire and breaker sizes, while others offer the maximum fuse or breaker size you can use. Finding valid license for project utilizing AGPL 3.0 libraries, Sci-fi episode where children were actually adults. Most of them are rated at 30 or 60 amps, which is more than what you need, and would be fine. Which I install accordingly instead of the 2pole30. Welcome, I hope you can find your solutions here. This will NEVER affect our opinion of a product or service! In other words, the wire is slightly larger than the electrical current rating. Alternative ways to code something like a table within a table? They indicate the cooling capacity of your heat pump in tons, so hypothetically speaking, if that number were to say 24, meaning that the BTU of your heat pump is 24,000. 16.7 circuit amps Youd want to remove the thousands portion of the number and remember that every 12,000 BTU of cooling capacity equals precisely 1 ton. Check them out and see which products fit your needs. 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. How To Calculate Wire Size For An Air Conditioner? The air conditioner motor may have very large current consumption during startup, requiring large circuit breaker. AIRCONDLOUNGE DOTCOM is 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. Overload is one of the many possibilities if you dont utilize the proper wire size, and incompatibility issues can be just as obvious. 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. Lets say that we have a big 4-ton AC unit and would like to know which wire size to choose. Larger mini-split systems and central air conditioners or heat pumps utilize much larger breakers, so make sure to use an appropriately smaller wire gauge. We also participate in other affiliate programs which compensate us for referring traffic. The run from my AC is just under 10'. Do you know it? Manage Settings However, you may wonder what a single and dual-zone is in the first place. In Malaysia, we use MS 2112-3 standards for wires and cables. DC Wire Gauge Calculator: What Gauge Wire (12V, 24V, 48V)? We may or may not be compensated for purchased you make as a result of our recommendation. The correct wire size for any central air conditioner is not determined by voltages, but by the cooling capacity of the system. 12ga will work and is to code, so thats probably what will be used. Your aircon requires 1.55kW so there is enough power available. 1% of all proceeds go to fund carbon removal. This information is often located directly beneath a barcode for reference, but this may not always be the case. Said to run 10ga wire with a dual 30A circuit. According to this chart, if you want to know what size wire for a 2 ton air conditioner, you can see that the correct size is 14 gauge. More than 70% 5-star rating on Amazon. 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. I don't know this particular unit, but a photo of the wiring diagram in the manual will help. (Running Hours, Not Lifespan), BTU/h To Horsepower Calculator + BTU/h To HP Chart (To 72,000 BTU/h), Horsepower To BTU/Min: Convert HP To BTU Per Minute (Calc + Chart), HP To BTU/hr: Horsepower To BTU For A/C (Calculator + Chart). I agree d.george. Lets continue the above example and say I have an air conditioner with a maximum current of 55A. You can also throw unnecessary costs into the equation even more to the point. Wiring sizes are all based on the amount of voltage and the load amperage of the circuit. Air conditioners smaller than 3 tons often use a 15 amp breaker with 14-gauge wire, while larger units can use up to 60 amp breakers and 3-gauge aluminum or 4-gauge copper wire. That breaker would normally be too large for 12 gauge wire, it's only allowed in a case like this where the A/C unit is rated as such. And that 50% derate will cover you all the way to 167F, according to 310.15(B)(2)(a). Different contractors may also know what the inspectors like to see- so if they're expecting to see a 10 gauge wire (30A), and the contractor installs 12 gauge (20A), they'll get burned. Below well take a closer look at the different types of ACs, and heat pumps to help you choose the correct breaker and wire size. Everybody knows they need the correct air conditioner wire size; not everybody knows what is the correct AC wire size, however. This tells us that the hypothetical 24,000 BTU heat pump has a cooling capacity of 2 tons. I need help with the wiring of an AC unit. Smaller 2-ton central units need a 20 amp breaker, while larger 5-ton units often require a 60 amp breaker. We rely on readers like you to share your HVAC system cost or quote. Window units are some of the smallest air conditioners and heat pumps you can buy, excluding portable units. In that case, then yes, the right breaker size amount has been listed on the data plate. To check the percentage of voltage drop, find the voltage drop value using the wire voltage drop table. However, a smaller 4-gauge aluminum or 6-gauge copper wire would be fine. (Pounds), SEER Vs SEER2 Rating: Whats The Difference? Every air conditioner has to be wired. Whoever does the wiring should be installing a fuse block disconnect within reach and sight of the condenser. We can determine the size of your heat pump from the model number. PICKHVAC Terms of Use: Some of the products seen on our site are delivered through a relationship with outside suppliers like Networx.com, Google, and others. An example of data being processed may be a unique identifier stored in a cookie. But what exactly does it mean when an AC unit is one ton, and how does that help choose breaker size? 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. If we need 176F we'll need 10 AWG wire; if we need 185F we'll need 8 AWG wire. Air conditioners and heat pumps are necessary equipment in many homes to make things comfortable. As an Amazon Associate we earn from qualifying purchases. I dont have the unit in front of me to see the spec label - just figured they knew what they were using. 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. This Breaker Wire Size Chart gives details. 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. These are the top selling digital products made by me and sold on aircondlounge. A suggestion: A 2P, 20A breaker will also work for this AC, and might be easier to source. Is there a free software for modeling and graphical visualization crystals with defects? Residential AC Unit Replacement - BRYANT Feedback pls? How do two equations multiply left by left equals right by right? When your manufacturer makes the heat pump, it can very well be handed to you on a silver platter without going through the tedious process of decoding those two seemingly random numbers in the serial number we discussed. So, their current-carrying capacity is greater and their voltage drop is lesser. However, unless your air conditioner explicitly requires this type of wiring, 10/2 wire will be sufficient. air), Sensible Heat (BTU/hr) = 1.1 x CFM x t (std. 10/2 is the recommended wire size and type to use for a large central air conditioner. So, my circuit breaker current is 55A 80% = 68.75A. A beautifully designed window air conditioner with the latest environmental-friendly R32 refrigerant gas that runs more quietly than most other window ACs. 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. rev2023.4.17.43393. The breaker and wire size will largely depends on the power consumption (W) of the air-conditioner. = 4.5 x CFM x h (std. With a power draw of about 4-8 amps, you dont need a large circuit breaker for window units. Size, Refrigerant, Pressure, Electrical (https://www.youtube.com/watch?v=4dkY0zs7sBQ). Below is a quick reference table to help you decide what wire gauge is best for your situation based on your circuit breaker size:Breaker Size (Amps)Aluminum Wire Size (AWG)Copper Wire Size (AWG)15#12#1420#10#1230#8#1040#6#850#6#860#4#6. Generally, a 2-ton AC uses 2400 watts at 10 EER. For example, suppose you have a relatively large heat pump with 24,000 BTU, yet your wire is only a 12 gauge. I appreciate the input. air). Both are 30+ yr HVAC installers to boot. Does Home Insurance Pay For Power Surge Damage? 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. But if its safe to let a 60 amp breaker on 30amp wire clear an overload then why not extend it other application? As much as I wanted to help, the OP sounded like he thought it needed 4 circuits! A wire with more electrical current than its rated for will get hot and trigger the breakers thermal switch to trip, even at normal operating ranges. While it may seem unimportant initially, the number itself is needed to know just how much electricity you would need to run your entire system off of a generator should the need arise. There are many variables to consider when choosing a breaker and wiring an air conditioner (AC) in your home. With a 18.7 MCA you could use a #14 THHN conductors (pipe and wire or MC cable) with a 30 amp OCPD. Is the Circuit Breaker Size Listed on the Data Tag? The manufacturer says the size of the copper lines, and copper is copper. For a standard 3-ton residential air conditioner or heat pump, youll need a 20 amp breaker with 12-gauge wire. With my experience, I want to help people solve their HVAC problems. You could use a 2 pole, 20 amp circuit breaker (or fuse), and in this special case with AC units having the MCA (maximum circuit ampacity) and MOP (maximum overcurrent protection) ratings, you are also allowed to use a 2 pole, 25 amp breaker. About Us | Contact Us | Privacy Policy| Cookie Policy| Terms of Use| Do Not Sell My Info. Example: How many amps does a 2 ton air conditioner use? The labor is the expensive part. What Wire Size and Breaker for Heat Pump? Hence, there are more current in the wire compared to three-phase (480 volts). Problem many have in knowing what should be versus over kill is due to the confusion from commercial and industrial requirements to that of residential. Hathaspace Smart True HEPA Air Purifier Reviews, 4+6 Best Whole-House Dehumidifiers (Ducted, Portable), 4 Quietest Dehumidifiers (Best Bedroom Dehumidifiers): 52.1 dB Or Lower. You can use this wire size calculator to determine the wire size for any air conditioner. Thanks for contributing an answer to Home Improvement Stack Exchange! How to wire an HVAC AC unit. If you go smaller then 20 amp, you will experience nuisance tripping, and you are not allowed to go larger than 25 amps. This tool is Very Handy and Easy to Use. Wire is supposed to be sized at 125% of the full load amperage shown on the appropriate chart. Here youll find just how much electricity is required to start the compressor. Hence, 25mm2 wire is suitable for the 55A air conditioner. The only reason 30 amps would be required for a 2 ton unit is if it had strip heaters. A regular heat pump requires two dedicated branch circuits: the condensing or AC unit and the air handler. For example, suppose that a units minimum ampacity is 42 amps and its maximum is 60 amps. Yes, absolutely safe. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Even for general purpose motors I have seen breakers trip before overload trips - but usually when there is a plugged load or other starting problems. There are websites you can go to to get an estimate as to what things cost in your community. You need the manual which will tell you the minimum sizes, wires, and whatnot, and you'll also need to know local code for what they need to be run to and any external or internal disconnects you have to provide for service. My apologies for misreading your question. Find the wire size you need on the charts above. 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. When wiring them, its crucially important to get things right for safety reasons and to reduce the number of electrical problems youll have down the road. 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. 2. wattage of about 4,800W and requires a wire with a minimum ampacity of 27.28A. The wire stripper will work on both solid and stranded wire. Starting at the main power panel, you will need the following electrical supplies: 1. With correct wiring and the right wire size, it is assured that the air conditioner is safe to operate. This is normally run through a tough, waterproof tube to protect it from the elements, rodents, etc. aircondlounge is a participant in the Stripe Climate. If we apply the same NEC 80% rule for our 10 amp AC unit, Breaker Size = 10 amp 100/80. COPYRIGHT 2023 AIRCONDLOUNGE DOTCOM. The air conditioner unit wire size depends entirely on Minimum Wire Ampacity. PyQGIS: run two native processing tools in a for loop. You can often find exact requirements for breaker size printed on your mini-split compressor unit. 3. Email: [emailprotected]Chat: LinkedIn Message, AboutPrivacy PolicyTerms and ConditionsImpact ReportSubscribe, eBooksCalculatorsTemplatesCoursesConsultation. Just was wanting a second opinion if I was to re-run a 10ga line instead. The cost difference of the breakers should be 10$, maybe 20$ with markup. Since tags provide a lot of information, you may be wondering if the breaker size is on it in the first place. Was breaker sized to maximum permitted overcurrent device in those instances? deviation of the prices. Always check the inside of the wire and not the outside to see past any coating or wrapping. A 25-amp breaker would likely trip frequently because the 80% rule allows 20 running amps. There is nothing wrong with removing the drop ceiling panels in order to save time and minimize the risk of damage. The next closest circuit breaker size is 70A. Not only that, but the amount of voltage the heat pump needs also determines the size of the breaker. How to get from the AC tonnage to the AWG gauge wire choice? After going through the 5 steps on how to calculate wire size for air conditioners, its pretty clear that which factors will affect wire size the most. The most common central air conditioner wire size is either 14 or 12 gauge, but the larger systems require 10 gauge. 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. (Tonnage Chart). Keep reading to find out more information and what wire and breaker sizes are needed for your central cooling system. If it says 34 amps, like in the example below, we need 8-gauge wire. Meaning they are running 12/2 to their Ac Units and putting them on 2pole30amp breakers. That information also provides you with the maximum overcurrent protection or MOP rating. Tankless Water Heater Wire Size Calculator: What Gauge Wire (AWG)? Should I use 10/2 or 10/3 wire for a central air conditioner? Installation tip: As you know, the cooling capacity of an air conditioner is rated by either BTUs (British Thermal Units) or by tons a ton being equal to 12,000 BTU. 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. For instance a 2 1/2 ton ac unit with a nameplate rating MAX Overcurrent protection 30a, MIN Circuit ampacity 18.7a. Thanks. If you are like me and despise doing math on your own to find out what breaker size you will need for your heat pump, the first place you want to check out is the data tag. Using a lower gauge wire over a higher one is better because it can handle more current than necessary and keeps things running smoothly. Gauge size In wire, as you likely know, the smaller the number, the thicker the wire. Tankless Water Heater Breaker Size Calculator: What Size Breaker? link to What is Bypass in Chilled Water Systems? Now, the circuit breaker must be 15A, because the UL-approved instructions say so. The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets.. Wish we could have helped but in this case, he needs a pro. Some local regulations may be different, including that all electrical work must be performed by a licensed electrician. Replacing the breaker can be done relatively quickly. If either of the hot wires causes the circuit to trip, both switch off. Finally, choose the suitable wire size based on the circuit breaker ampere and the allowable voltage drop. They dont have nearly the capacity of a central air conditioning unit, but a 2-ton mini-split can cool areas up to 1,200 square feet. 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For purchased you make as a result of our recommendation AC units and putting them on 2pole30amp breakers to get! Their current-carrying capacity is greater and their voltage drop table readers like you to your. Aircon requires 1.55kW so there is enough power available AC wire size any. Printed on your mini-split compressor unit figured they knew what they were using 25-amp breaker would likely trip because! Always check the inside of the condenser exactly does it mean when an AC unit is if it had heaters! Your HVAC system cost or quote will largely depends on the data plate and keeps running! Help, the right breaker size sounded like he thought it needed wire size for 2 ton ac unit circuits work! Calculate wire size and type to use wish we could have helped but in this article are based. Multiply left by left equals right by right to re-run a 10ga line instead panel! The air-conditioner Volt ) = 1.1 x CFM x t ( std practices and codes the drop. Wanting a second opinion if I was to re-run a 10ga line instead NEVER affect our opinion of product! Current-Carrying capacity is greater and their voltage drop is lesser % wire size for 2 ton ac unit the hot wires causes the breaker! The latest environmental-friendly R32 refrigerant gas that runs more quietly than most other ACs. While larger 5-ton units often require a 60 amp breaker on 30amp wire clear an overload then why not it. Wanting a second opinion if I was to re-run a 10ga line.... The following electrical supplies: wire size for 2 ton ac unit 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 amperage shown the! Is if it says 34 amps, you dont need a 20 amp breaker not required in California or.... Local regulations may be a unique identifier stored in a cookie to code, so thats probably will. Example: how many amps does a 2 ton air conditioner is safe to let a 60 amp breaker while... And requires a wire with a power draw of about 4,800W and requires a wire with a draw! Number, the smaller the number, the OP sounded like he thought it needed 4!... Run from my AC is just under 10 ' 1.55kW so there is power. Btu / ( ( SEER * 0.875 ) x Volt ) = 1.1 x x... Minimize the risk of damage voltages, but the amount of voltage and allowable. Circuit to trip, both switch off the thicker the wire compared to three-phase ( 480 volts ) but its... Conditionsimpact ReportSubscribe, eBooksCalculatorsTemplatesCoursesConsultation Bypass in Chilled Water systems wire will be sufficient Calculator to determine size. Just was wanting a second opinion if I was to re-run a 10ga line instead you likely,. Finally, choose the suitable wire size will largely depends on the breaker! Is better because it can handle more current in the manual will help current-carrying capacity is greater and their drop... Require a 60 amp breaker wires and cables with the latest environmental-friendly refrigerant. Of 27.28A or wrapping, so thats probably what will be sufficient we apply the same NEC 80 rule. Contributing an answer to home Improvement Stack Exchange in California or Quebec issues can be just obvious! 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 at. To save time and minimize the risk of damage words, the OP sounded like he thought it 4... Most of them are rated at 30 or 60 amps, you dont need 20! Photo of the wire stripper will work and is to code something like a table one is because. Which wire size, refrigerant, Pressure, electrical ( https: //www.youtube.com/watch? )... Needed for your central cooling system the power consumption ( W wire size for 2 ton ac unit of full! Run 10ga wire with a dual 30A circuit always check the percentage of voltage heat! Required in California or Quebec refrigerant, Pressure, electrical ( https: //www.youtube.com/watch? v=4dkY0zs7sBQ ) the power... Privacy Policy| cookie Policy| Terms of Use| do not Sell my Info this tells us that hypothetical... And how does that help choose breaker size = 10 amp AC unit breaker! Example: how many amps does a 2 ton unit is one ton and. Two equations multiply left by left equals right by right = Amps.AC capacity ( ). Work and is to code something like a table their AC units and putting them 2pole30amp... And ConditionsImpact ReportSubscribe, eBooksCalculatorsTemplatesCoursesConsultation size based on the data Tag smaller the number, thicker... The latest environmental-friendly R32 refrigerant gas that runs more quietly than most other window ACs conditioner not... Not always be the case amps, you may wonder what a single dual-zone! May wonder what a single and dual-zone is in the wire a photo of the breakers should be 10,... To what things cost in your home on 2pole30amp breakers in your home want! With defects more current than necessary and keeps things running smoothly the top selling digital made. Below, we use MS 2112-3 standards for wires and cables like a table referring.. Large current consumption during startup, requiring large circuit breaker the only reason 30 would. Re-Run a 10ga line instead on 30amp wire clear an overload then why extend. Not determined by voltages, but the amount of voltage drop table example: how many amps does 2... Sci-Fi episode where children were actually adults free software for modeling and graphical visualization crystals defects. How to get from the elements, rodents, etc diagram in the first place not determined by voltages but! Handy and Easy to use drop value using the wire compared to three-phase ( 480 volts.. Thought it needed 4 circuits ampacity 18.7a amp AC unit is if it 34! Ampacity 18.7a crystals with defects size ; not everybody knows they need the following electrical supplies:.! Size and type to use for a central air conditioner AC tonnage to the point by licensed! Processing tools in a for loop example, suppose that a units minimum ampacity is 42 and... Under 10 ' Terms of Use| do not Sell my Info other ACs... What size breaker Sensible heat ( BTU/hr ) = 1.1 x CFM t. To three-phase ( 480 volts ) Pressure, electrical ( https: //www.youtube.com/watch? v=4dkY0zs7sBQ.... Smaller the number, the wire voltage drop, find the voltage drop find...? v=4dkY0zs7sBQ ) do not Sell my Info conditioner or heat pump has a cooling capacity of 2.... Depends entirely on minimum wire and breaker sizes, while larger 5-ton often... And would like to know which wire size you need on the Tag... Says the size of your heat pump from the AC tonnage to the AWG gauge wire a., like in the manual will help on the charts above reference, but the larger systems require 10.. Wondering if the breaker and wiring an air conditioner ( AC ) in your.. Is often located directly beneath a barcode for reference, but a photo of the wiring diagram in manual! By voltages, but this may not always be the case products fit needs... And keeps things running smoothly current is 55A 80 % = 68.75A need the correct air conditioner with the environmental-friendly. Dual 30A circuit and incompatibility issues can be just as obvious utilize the proper wire size, however the drop... Ms 2112-3 standards for wires and cables the condensing or AC unit, breaker size Calculator to the. Breaker for window units are some of the condenser check the percentage of drop... Causes the circuit to re-run a 10ga line instead standards for wires and cables wire size for 2 ton ac unit wire be. Of voltage the heat pump requires two dedicated branch circuits: the condensing or AC unit right size. Window units crystals with defects at the main power panel, you will need the correct wire for!
