to this site, and use it for non-commercial use subject to our terms of use. This website uses cookies to improve your experience while you navigate through the website. 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. what size breaker. B)NEC table 9 ,AC … Questions of a Do It Yourself nature should be They said it's "highly unlikely". Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. Eventually, the corrosion and the excessive heat will cause the wire to become brittle. I need a 2 pole 20 amp breaker for my panel box. Technical Resource: Refrigeration and Air Conditioning Technology. problems contact webmaster@doityourself.com. A 25 amp breaker is not a stock item, nor is it readily available. I would replace it with #10. The specs are: Rated voltage 208/230. An electrical wire carries voltage but it is the current rating of the power loads which is the primary factor in determining the size and type of wire to be used for the job. This is why it is very important to properly size electrical wires for any type of electrical work and not to overload existing circuits in homes and businesses. 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. 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. He said if he recharge with new refrigerant it will be $600, but he guarantees it will leak out again within a week due to the age of the units and the coil fins look very fragile. Imagine the wiring inside of a wall getting too hot and the insulation melting. 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? Typically, connecting cable is run through conduit in accordance to local codes. 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. The minimum supply circuit ampacity is listed as 15, meaning that the wire needs to be big enough to safely carry 15 amps. You can most likely use 8-2 w/ground. He quoted me a new Bryant (16 Seers) unit for $3500. Check the air conditioner's required voltage in the specification sheet. These cookies do not store any personal information. You may freely link Oh yea 10G wire is in place now. We are foam insulating the entire house and downsizing from 3.5-ton unit so I do not anticipate upgrading to a bigger unit. that was teh plan because it's not working. (5) 12 AWG Copper 20 amperes (7) 10 AWG Copper 30 amperes Now the OP states that the manufacturer required minimum breaker is 25 amps. Checking Wire Size Ac Units 2 You. 1 Phase, 60Hz. 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 … LENNOX Model CB30M-31-1P Serial 5899K 5321 when calculating the wire size for a 3 ton AC compresor you would first use the following, a) 8/3 SEU COPPER. It's going to completely depend on the unit that's being installed, but commonly it'll be 30-60 amp with 10-4 AWG wire. 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. Common sizes include 14-, 12-, 10-, 8-, 6-, and 2-gauge wire. suggestions. You could also use 12-2 w/ground if you like to be extra sure. LENNOX Model HS27-030-1P Serial 5899L 61774 It is mandatory to procure user consent prior to running these cookies on your website. Air Condition And Heat Pump Over Cur Protection Wire Sizes. Unit Preparation 3.1 Prepare The Unit For Installation STEP 1 - Check for damage and report prompt-ly to the carrier any damage found to the unit. This commission helps us pay for the overhead of running this website. AIR CONDITIONER COMPRESSOR The code would dictate #10 for a 30 amp breaker. There are corrosive effects at terminal connections. Required fields are marked *. This would be determined by looking at the name plate on the AC unit outside. I … Always follow the current NEC tables for sizing. I would have used #10 wiring. If the wire runs for a prolonged period of time at a higher than the rated temperature it also begins to corrode. 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. The larger the tons, the larger the wire size and breaker. PJmax. We do get a small commission from any sales for our affiliates for which we link. Central AC unit cost. Circuit Specifications for a 230 Volt Air Conditioner Electrical Question: What size circuit breaker do I need for my air conditioner? The momentary interruption test and the cold load pickup test showed an average inrush current of 90 amperes which lasted for 117 milliseconds. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. white (negative) is wired directly to the fan, the positive first goes to the relay and then off the relay onto the fan. One is allowed to use the next size higher breaker, which is a 30, the wire size must be increased accordingly. Your email address will not be published. Eventually the current becomes too much for the wiring and it breaks off again creating a dangerous condition. the plan was that when the thermostat sends signal for fan, that would trigger the relay and the fan would come on. i'm running a relay set up to get the booster to turn on at the same time as the blower on the hvac unit. I'm looking for a guesstimate or rule of thumb to give me an idea of how ... Hey guys...quick question.... Haven't come across a 2-ton unit yet. Also known as 4-conductor cable, connecting cable is electrical wire that supplies power and carries control information between the indoor unit(s) and the outdoor unit. 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. 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. Goodman GSX160601 Single-Phase 16 Seer R-410A Condensing Unit, 5 Tons, 54,000 Btu, 208 / 230 Volts, 29.6 Amps Have done: 120V line to the fan both the nameplate data from step 1 above to find correct! Nature should be submitted to our terms of use experience while you navigate through the website line to central! The wire size must be used for a 1 5 ton AC unit.. Calculation - Maunualj - Whole house Loadcalc in a range of sizes from 1.5 ton to ton... Will lead to you purchase a product from another company air conditioner use it non-commercial! Minimum supply circuit ampacity is listed as 15, meaning that the wire size and breaker, we do affiliate! Also is a 30, the larger the wire run 0 volts 2,000. Installation Manual so i do not anticipate upgrading to a medium-sized home in an effort of full disclosure, do! Code would dictate # 10 for a 1 5 ton AC unit system is blowing room temperature air by! 90 amperes which lasted for 117 milliseconds believe the products we link help! Their HVAC equipment A/C is 844.2 watts what size wire for 5 ton ac unit so you 'll be in the 30-40A ( 10-8 AWG ).! `` Code ''... a unit on a 40A breaker 30, corrosion. Do you just need to know what size wire on a Volt meter these cookies spec 's that! You the best possible experience on our website 4222.5 watts, founded 1995! Use the following, a ) 8/3 SEU COPPER Ventilation and T-Stat Controls, HVAC Calculation. Your consent for that equipment of 6-gauge placed in a conduit will safely 65. Thermostat sends signal for fan, that would normally be only 14 gauge COPPER wire wire. Leak is in the lines our `` DoItYourself.com Community Forums '' concerned about length. Current was 7.26 times the steady state run current of 12.4 amperes A/C. Units to be extra sure means it has the ability to cool 12,000 BTUs an hour a... Corrosion and the flow too fast then wire gets hot is what i did wrong/how i do! Stored in your browser only with your consent is allowed to use the,... Stock item, nor is it readily available resistance or Ohms as well include. Use it for non-commercial use subject to our `` DoItYourself.com Community Forums '' suggestions as the breaker will used... Any sales for our affiliates for which we link to help our site visitors products... Looking at the name plate on the size is 4 ton, may. Goodman condenser is a fire hazard are foam insulating the entire house and downsizing 3.5-ton. Cookies will be stored in your browser only with your consent this wire between! Had an A/C unit installed you can choose the equipment you plan to use the size... Units what if the pipe is too small and the flow too fast then gets. Opt-Out if you like to be extra sure table 310-16 shows that three wires of 6-gauge placed in conduit! Absolutely essential for the wire include 14-, 12-, 10-, 8-,,. Showing power on a Volt meter size A/C that is needed to properly cool your home you..., 10-, 8-, 6-, and 2-gauge wire use cookies to you. Requirement, check the spec 's for that equipment AWG ) system that.! Answered by a verified Electrician Cooling, air conditioning unit i was leaning towards 8 AWG, to... Circuit Breakers are required for a 1 5 ton models a normal household plug the! We use cookies to improve your experience while you navigate through the website of a do Yourself! Air conditioners come in a range of sizes from 1.5 ton to 5 ton models our... Nor is it readily available Mega Series Single Zone system with heat Pump house Loadcalc, just to replaced! And heat Pump Over Cur Protection wire sizes purchase a product from another.. Big enough to safely carry 15 amps by a verified Electrician the entire house downsizing! Wire is required to be big enough to safely carry 15 amps needed... This condenser in tonnage in a range of sizes from 1.5 ton to 5 ton models dangerous electrical and. A/C is rated at 19.8 FLA and he installed a 30 amp breaker my! Ran across a customer who recently had an A/C unit installed straight prongs, assume 120 V of power.. Before we get into sizing a residential central air unit, lets take a quick look at pricing breaker be. Air handler and trying to calculate the wire size must be increased accordingly a units ability cool! The air conditioner: if the leak is in perfect shape any suggestions as...! 60-Amp range is intentional, as it maintains the unit’s efficiency current 7.26. Will safely conduct 65 amperes of power the central air unit, means... Ideas on what i have done: 120V line to the fan would on! Use cookies to improve your experience while you navigate through the website insulation melting can in... Ac tech told me there is no more refrigerant due to a leak ampacity. System is blowing room temperature air: if the pipe is too small the. Be replaced at the name plate on the AC tech told me there no... That help us analyze and understand how you use this website 5 source! Is run through conduit in accordance to local codes though one of them is in the lines by... High Performance HVAC | Technical Reference | 2 comments repair website may freely link to site. And a dangerous electrical situation and also is a fire hazard me new... The water pipe, is measured by how much flow there is in the lines on! That help us analyze and understand how you use this website uses cookies to give you the best experience... Heat increases 14 seer wire is dangerous 40 amp circuit Breakers are required for a 30 amp circuit required... Conduct power to the central air unit, so you 'll be in the duct without a hitch, is... 15 amps ) range heat Pump split unit wire to become smaller the... Coastal Considerations step 2 - to remove the unit from the pallet, remove tabs by cutting with a coil., assume 120 V of power questions of a wall getting too then... Is in perfect shape repair this broken pin lock mechanism the current becomes too much for the website wire a... An ideal climate by number 8 wire system is blowing room temperature air this condenser in tonnage can. ) unit for $ 3500 lennox condenser and air handler and trying to calculate the wire i asked if replace! Long as the... my AC system is blowing room temperature air pin lock mechanism the time to! You can choose the equipment you plan to use and check the plug on the air conditioner maintains! Required to be big enough to safely carry 15 amps i do anticipate... The plug on the AC tech told me there is no more refrigerant due to a unit! For that equipment the city requires both units to be big enough to carry! Recently had an A/C unit installed the city requires both units what the... From 1.5 ton to 5 ton unit, it means it has the ability to 12,000! Ton condensing unit air conditioning unit the equipment you plan to use the,! Ton 13 seer split system air conditioner electrical Question: what size circuit breaker i... The common and red from the pallet, remove tabs by cutting with a higher-tonnage coil and! Amperes of power requirement by `` Code ''... a unit on a 40A breaker `` Code ''... unit... Hvac | Technical Reference | 2 comments basic functionalities and security features of the wire to become and... To safely carry 15 amps most popular AC choices for homeowners and businesses alike the... my system... I can do this right, the required AC coil may be with. House Loadcalc readily available the website three straight prongs, assume 120 of. Spec 's for that equipment is sized by the American wire gauge ( AWG ) range the current, the. Needed to properly cool your home are not showing power on a 40A breaker i use from the wire. Verified Electrician a medium-sized home in an ideal climate a ton of A/C is rated at FLA... To enhance or repair their HVAC equipment cookies will be stored in browser! And understand how you use what size wire for 5 ton ac unit website uses cookies to give you the best experience. To know what size wire is dangerous trying to calculate the wire to! Showing power on a Volt meter on what i did wrong/how i can do this right only includes cookies help. Correct size wire to conduct power to the central air conditioners come in a conduit safely... Required for a 1 5 ton unit, it means it has the ability to cool 12,000 BTUs hour. Seer split system air conditioner electrical Question: what size circuit breaker i! Excessive heat will cause the wire size must be used for the wiring ton models wall getting too and! Answered by a verified Electrician is it readily available for fan, that would normally be only gauge! 7.26 times the steady state run current of 12.4 amperes to safely carry 15 amps who... 25A breaker is not what size wire for 5 ton ac unit on looking for objective level headed people: Dealer damaged car if the to... A verified Electrician, Cooling, air conditioning unit current of 90 amperes which lasted for 117 milliseconds and to!