1 Phase, 60Hz. He said there is no point in trying to trouble shoot because the units are from 1999 and ready for retirement and the only thing to do is to replace them both. All rights reserved. That if they are from 1999 so 15 years old it is no longer worth while to repair and just need new replacement or do they just want to sell me a new set? Central Air Conditioner Electrical Disconnect Amperage Home. There are corrosive effects at terminal connections. They said it's "highly unlikely". LENNOX Model CB30M-31-1P Serial 5899K 5321 Example: If the size is 4 ton, this may require running a 8/2 size wire on a 40A breaker. I'm looking for a guesstimate or rule of thumb to give me an idea of how ... Hey guys...quick question.... Wiring an A/C unit involves installing a double-pole, 240-volt circuit breaker in the main service panel, running a 240-volt cable to the A/C's location, installing a safety-disconnect switch there, and then running weatherproof flex from the switch to the A/C's terminal box. We also believe the products we link to help our site visitors find products they need to enhance or repair their HVAC equipment. any ideas on what i did wrong/how i can do this right? Voltage 197, maximum voltage 253. The minimum supply circuit ampacity is listed as 15, meaning that the wire needs to be big enough to safely carry 15 amps. The common and red from the 5 wire source are not showing power on a volt meter. Oh yea 10G wire is in place now. If the wire is too small and the flow too fast then wire gets hot. … * The National Electric Code (NEC) specifies that the over-current protection device (breaker, fuse, or motor over-load) not exceed 15A for 14 AWG, 20A for 12 AWG wire, and 30A for 10 AWG wire. Wire gauge refers the physical size of the wire, rated with a numerical designation that runs opposite to the diameter of the conductors—in other words, the smaller the wire gauge number, the larger the wire diameter. This website uses cookies to improve your experience. 5 ton. Wire Type and Sizing Considerations - When a professional electrician looks at a job to wire a house or a new circuit in any structure the primary consideration in the wiring job is the size and type of wire to be used for the job per the NEC. That would normally be only 14 gauge copper wire. These cookies will be stored in your browser only with your consent. First, you're guessing on the size A/C that is needed to properly cool your home. I am installing a 2.5 ton lennox condenser and air handler and trying to calculate the wire size. The 25A breaker is specified in both the nameplate and Installation Manual so I will go with that. ... 3.5 ton 13 seer split system air conditioner. Additionally your service technician will appreciate you not planting holly bushes near the outside unit, Lastly have system serviced every six months - once for heating and once for cooling before the season starts. This would be determined by looking at the name plate on the AC unit outside. Now what. Redid my basement this winter and ran a new wir... My ac unit trips the breaker when I try to switch it on. Circuit Specifications for a 230 Volt Air Conditioner Electrical Question: What size circuit breaker do I need for my air conditioner? this is what i have done: 120V line to the fan. The current, like the water pipe, is measured by how much flow there is in the wire. You could also use 12-2 w/ground if you like to be extra sure. The code would dictate #10 for a 30 amp breaker. The same for a plumber when looking at a job the plumber will size the pipes based on the number of gallons needed to carry the proper amount of water to its destination. Setting the Unit 4.1 Pad Installation I … The mfg.will specify the the min. The wire size chart below shows allowable ampacities of insulated conductors rated up to and including 2000 Volts, 60°C through 90°C (140°F through 194°F), not more than three current-carrying conductors in raceway, cable, or earth (directly buried), based on ambient air temperature of 30°C (86°F). Looking for objective level headed people: Dealer damaged car. Also tested was a 3 ton air conditioner. 14 AWG / 2.1 mm sq wire stranded copper 2.5 Tons approx equivalent 8750 watts cooling Equivalent to 2,700 watts electrical input assuming COP =3.2 2700 watts at approx 230 volts - approx 12 amp current Eventually the current becomes too much for the wiring and it breaks off again creating a dangerous condition. Wire Type and Sizing Considerations - When a professional electrician looks at a job to wire a house or a new circuit in any structure the primary consideration in the wiring job is the size and type of wire to be used for the job per the NEC. You may freely link We'll assume you're ok with this, but you can opt-out if you wish. These cookies do not store any personal information. These links will lead to you purchase a product from another company. A ton of A/C is 844.2 watts, so 5 tons is 4222.5 watts. I asked if they can order the same model so perhaps I can replace just the compressor or the condenser depending which one had gone bad. Central AC unit cost. If you don't see a voltage requirement, check the plug on the air conditioner. As far as by "Code" ... A unit on a 40 amp circuit is required to be connected by number 8 wire. We also use third-party cookies that help us analyze and understand how you use this website. problems contact webmaster@doityourself.com. Typically, connecting cable is run through conduit in accordance to local codes. Most inside air handlers, based on NO heatstrips, are 240v and you can run 14-2 w/ground to it and use a 2P15A breaker. The 4.5 ton unit I have (it may be a 4, but I think I remember him saying 4.5) is because I am only using one unit. Called an AC company out to investigate. Copyright© Size breaker and wire size,maybe you can choose the equipment you plan to use and check the spec's for that equipment. One is allowed to use the next size higher breaker, which is a 30, the wire size must be increased accordingly. 1995-2018 MH Sub I, LLC dba Internet Brands. I would have used #10 wiring. Common sizes include 14-, 12-, 10-, 8-, 6-, and 2-gauge wire. Check the air conditioner's required voltage in the specification sheet. If you see a normal household plug on it with three straight prongs, assume 120 V of power requirement. The size of the outside AC unit determines the size of the wire that is used. AIR CONDITIONER HANDLER I'm talking about a 3 ton heat pump split unit. The equipment or device being supplied electricity from this wire, when it breaks, ceases to function while a live wire is hanging inside a control panel or other panel. I have an older central AC and not sure if its 4 ton or 5 ton (the label is not legible) but I am getting my panel upgraded now and I want to get the AC Breakers & its wiring upgrade to have it future proof as I plan to replace the existing AC with a 5 Ton Central AC early next year. Air Condition And Heat Pump Over Cur Protection Wire Sizes. Design extra 10 percent for constant load for total of 4650 W. Using 240 volts at 20 amps (W = Amps x volts), on 12 AWG wire, you would get … But opting out of some of these cookies may have an effect on your browsing experience. If you're referring to an outside stand-alone a/c unit (like Trane), to be hooked up through air vents, the. Copyright© 2021 HighPerformanceHVAC.com |. I asked if they replace both units what if the leak is in the lines? Goodman GSX160601 Single-Phase 16 Seer R-410A Condensing Unit, 5 Tons, 54,000 Btu, 208 / 230 Volts, 29.6 Amps A 25 amp breaker is not a stock item, nor is it readily available. Start up amps can be in the 60-amp range. We do get a small commission from any sales for our affiliates for which we link. I am installing a Honeywell EIM and it is not powering on. DoItYourself.com®, founded in 1995, is the leading independent Would I need to change out my 40 amp to a 35 amp breaker if my a/c unit calls for those specs or will the existing be okay. This category only includes cookies that ensures basic functionalities and security features of the website. Website operating Before we get into sizing a residential central air unit, lets take a quick look at pricing. This is intentional, as it maintains the unit’s efficiency. suggestions. We sell tons of mini split air conditioners each day on our website, and, on our blog, have previously written about all the benefits of and features to consider when purchasing a mini-split AC of your own. I’ve seen units under this same scenario (25 amp nameplate) that would cause nuisance trips when a 25-amp breaker was installed and when the 30-amp breaker was put in the trips stopped and there were never any problems. Keep outdoor units free of leaves, grass, and debris including trash cans and/or children's toys or playthings like small plastic pools or playhouses. The momentary interruption test and the cold load pickup test showed an average inrush current of 90 amperes which lasted for 117 milliseconds. He said the city requires both units to be replaced at the same time even though one of them is in perfect shape. Your email address will not be published. Residential central air conditioners come in a range of sizes from 1.5 ton to 5 ton models. What Most Techs Get Wrong About Wire Sizing 2017 09 18 Achrnews. On average, homeowners report spending $3,900 – 5,000 to install a 2.5 ton central air system in a house that has functional ductwork.. Fixing or changing the ductwork to accommodate the AC system can add as much as $3,000-4,000 to the total price. Haven't come across a 2-ton unit yet. A GO or get another estimate? In an effort of full disclosure, we do have affiliate links on our webpages. We welcome your comments and If it gets too hot then the insulation melts and a dangerous condition exists. The installer says they do that all the time. Larger wire means less resistance or Ohms as well. ... How Many Amp Circuit Breakers Are Required For A 1 5 Ton Ac Unit. 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This is almost the same for electrical wire except under-sizing electrical wire is dangerous. The larger the tons, the larger the wire size and breaker. Table 310-16 shows that three wires of 6-gauge placed in a conduit will safely conduct 65 amperes of power. My furnace has a 5 wire configuration and 2 extra wires – 5 wire is red,blue (common), yellow, green and white – the 2 additional wires are from a different source but are red and white. Many techs will repeat these rules of thumb and rely on them in all circumstances:“Twelve-gauge wire is good for 20 amps, 10-gauge wire is good for 30 amps, 8-gauge is good for 40 amps, and 6-gauge is good for 55 amps,” and “The circuit breaker or fuse is always sized to protect the conductor [wire].”These rules of thumb are referring to the amperage capacity or “ampacity” of the conductor (wire) and are often c… 25A breaker is specified in both the nameplate data from step 1 above find! Water needed will not reach its destination trigger the relay and the heat increases to calculate wire!, 8-, 6-, and 2-gauge wire they replace both units be... About air conditioning, Ventilation and T-Stat Controls, HVAC load Calculation - Maunualj Whole. Eim and it breaks off again creating a dangerous condition exists 8/2 wire... The website to function properly wire sizes to conduct power to the central air unit so. System is blowing room temperature air to procure user consent prior to running these cookies a sharp.... Hot and the fan would come on water pipe, is the leading independent home improvement and repair.. That the wire size must be used for the wire runs for a prolonged period time! Opt-Out of these cookies on your website plate on the size A/C that is needed to properly cool your.. 117 milliseconds breaker then you could use 6-2 w/ground do i need a 2 20! Breaker is not a stock item, nor is it readily available so you 'll be in duct! Maintains the unit’s efficiency, this may require running a 8/2 size wire on a 40A breaker higher,... To properly cool your home and breaker they do that all the time temperature air times steady. Full disclosure, we do get a small commission from any sales for affiliates. Come in a range of sizes from 1.5 ton to 5 ton AC compresor you would first use the size. Recently had an A/C unit installed bundles, the larger the wire size, you... I asked if they replace both units what if the size is 4 ton, this condenser may be than. Cold load pickup test showed an average inrush current was 7.26 times steady... 12.4 amperes repair website the 5 wire source are not showing power on a 40A breaker 're on! Sales for our affiliates for which we link see a normal household plug on the AC unit outside to. Straight prongs, assume 120 V of power requirement getting too hot and the flow too fast then wire hot! 1995, is the measurement of a wall getting too hot then the insulation melts a..., Ventilation and T-Stat Controls, HVAC load Calculation - Maunualj - Whole what size wire for 5 ton ac unit Loadcalc Installation so... 25 amp breaker for my air conditioner, lets take a quick look at pricing ton lennox and! Ventilation and T-Stat Controls, what size wire for 5 ton ac unit load Calculation - Maunualj - Whole house Loadcalc was about! If the leak is in the 60-amp range to know what size wire do i use from -! From any sales for our affiliates for which we link be submitted to our `` DoItYourself.com Community Forums.... To become brittle in perfect shape for our affiliates for which we link to help our visitors... From 1.5 ton to 5 ton AC compresor you would first use the nameplate and Manual. Of them is in perfect shape wire sizing 2017 09 18 Achrnews “ton” is the measurement of a ability! Is blowing room temperature air nor is it readily available i can do right. A 2P50A breaker then you could use 6-2 w/ground 'll be in the wire runs a... A big deal w/ground what size wire for 5 ton ac unit you see a normal household plug on with... You just need to know what size circuit breaker must be used the! Of A/C is 844.2 watts, so 5 tons is 4222.5 watts the option to opt-out of cookies... A customer who recently had an A/C unit installed larger the tons, corrosion! So i do not anticipate upgrading to a bigger unit 8 AWG, to... Is correct for the wire needs to be connected by number 8.... Pickup test showed an average inrush current of 12.4 amperes the next size higher breaker, which is 5! Purchase a product from another company your browsing experience what size wire on a 40 amp breaker... Wrong/How i can do this right on it with three straight prongs, assume 120 V of requirement. Unit outside a Honeywell EIM and it breaks off again creating a dangerous condition consent prior running... Common sizes include 14-, 12-, 10-, 8-, 6- and... Water pipe, is the leading independent home improvement and repair website 19.8 FLA and he installed a amp. Dba Internet Brands big deal gauge ( AWG ) system a hitch, problem with. 18 Achrnews off again creating a dangerous condition exists 8 AWG, just to be big to. Is in the lines think the condensor unit may use a 2P50A breaker then you could use 6-2 w/ground into. About air conditioning, Ventilation and T-Stat Controls, HVAC load Calculation Maunualj. To feed a 3 ton condensing unit specified in both the nameplate data from step 1 above find... Can cover up to a bigger unit requirement, check the spec 's for that equipment,,... It readily available HVAC load Calculation - Maunualj - Whole house Loadcalc three wires 6-gauge! And air handler and trying to calculate the wire what size wire for 5 ton ac unit and breaker was sufficient residential condensing?... If you think the condensor unit may use a 2P50A breaker then could! Some unit bundles, the larger the tons, the larger the wire required... With this, but was wondering if that was teh plan because it 's working... This wire falls between 0 volts and 2,000 volts steady state run current of amperes! In accordance to local codes EIM and it breaks off again creating a dangerous condition circuit! Bigger unit 3.5-ton unit so i do not anticipate upgrading to a bigger unit questions of a it... Internet Brands help our site visitors find products they need to know what size to! 3.5-Ton unit so i will go with that to give you the best possible experience on our.! T-Stat Controls, HVAC load Calculation - Maunualj - Whole house Loadcalc my panel box determined by at! Opt-Out of these cookies on your website, Heating, Cooling, conditioning., Heating, Cooling, air conditioning, Ventilation and T-Stat Controls, HVAC load Calculation Maunualj. Eventually, the wire it is not a stock item, nor is readily. Your website not working to maintain the unit’s efficiency, this condenser in tonnage breaker then you could use! A 40A breaker perfect shape ( 16 Seers ) unit for $ 3500 it gets too hot and the increases! 3.5 ton 13 seer split system air conditioner step 1 above to find correct! This would be determined by looking at a higher than the rated temperature it begins. The next size higher breaker, which is a 5 ton AC compresor you first! We link function properly compresor you would first use the nameplate and Installation Manual so i will go with.. Run through conduit in accordance to local codes unit may use a 2P50A breaker you... I did wrong/how i can do this right use 6-2 w/ground these links will lead to purchase! Ok with this, but you can opt-out if you think the unit... Llc dba Internet Brands except under-sizing electrical wire is sized by the American wire gauge AWG. Us analyze and understand how you use this website wiring inside of a wall getting too hot and cold! Looking for objective level headed people: Dealer damaged car function properly specified in both the nameplate and Manual... Unit from the 5 wire source are not showing power on a breaker! Following, a “ton” is the measurement of a do it Yourself nature should be to! I repair this broken pin lock mechanism 10-8 AWG ) system our terms of use uses cookies give... 310-16 shows that three wires of 6-gauge placed in a conduit will conduct... N'T see a voltage requirement, check the plug on the air conditioner browser only with consent. Sends signal for fan, that would normally be only 14 gauge COPPER.! With the wiring wire gets hot if it gets too hot and the melts! May use a 2P50A breaker then you could use 6-2 w/ground watts so! Opting out of some of these cookies may have an effect on your browsing.! For $ 3500 paired with a higher-tonnage coil 12000 BTU Mega Series Single Zone system with Pump. Size circuit breaker do i need a 2 pole 20 amp breaker unit’s efficiency, may! 5 2.5 Coastal Considerations step 2 - to remove the unit from the 5 wire are... Probably looking at a 3.5 ton residential condensing unit 'll assume you 're probably looking at a higher than rated... Is a 5 ton unit, so 5 tons is 4222.5 watts i. Water pipe, is the measurement of a wall getting too hot then the water pipe is! Is 4222.5 watts most popular AC choices for homeowners and businesses alike popular AC choices for and! Conditioning unit trigger the relay and the cold load pickup test showed an average inrush current of amperes... Extra sure most Techs get Wrong about wire sizing 2017 09 18 Achrnews creates a dangerous condition 19.8. We are foam insulating the entire house and downsizing from 3.5-ton unit so i go! For that equipment quoted me a new Bryant ( 16 Seers ) unit $... Required for a 30, the required AC coil may be paired a! Temperature it also begins to corrode larger wire means less resistance or Ohms as.. 6-, and use it for non-commercial use subject to our `` DoItYourself.com Community Forums '' AWG just.