I am installing a 2.5 ton lennox condenser and air handler and trying to calculate the wire size. All rights reserved. That would normally be only 14 gauge copper wire. (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. This would be determined by looking at the name plate on the AC unit outside. home improvement and repair website. suggestions. 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? to this site, and use it for non-commercial use subject to our terms of use. 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… 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. any ideas on what i did wrong/how i can do this right? 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. I need a 2 pole 20 amp breaker for my panel box. Now what. If you see a normal household plug on it with three straight prongs, assume 120 V of power requirement. hello all … The question is: How to Wire an Air Conditioner for Control - 5 Wires – The diagram below includes the typical control wiring for a conventional central air conditioning system.Furthermore, it includes a thermostat, a condenser, and an air handler with a heat source. Typically, connecting cable is run through conduit in accordance to local codes. 1 Phase, 60Hz. that was teh plan because it's not working. 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. In order to maintain the unit’s efficiency, this condenser may be paired with a higher-tonnage coil. 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. submitted to our "DoItYourself.com Community Forums". LENNOX Model CB30M-31-1P Serial 5899K 5321 Always follow the current NEC tables for sizing. 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. The 25A breaker is specified in both the nameplate and Installation Manual so I will go with that. If unsure, then use burial cable (each wire thick as your thumb) from your main breaker box... and install a separate The momentary interruption test and the cold load pickup test showed an average inrush current of 90 amperes which lasted for 117 milliseconds. Min. Website operating ... 3.5 ton 13 seer split system air conditioner. As long as the breaker is correct for the wire size 5 amps isn’t a big deal. If it gets too hot then the insulation melts and a dangerous condition exists. In an effort of full disclosure, we do have affiliate links on our webpages. How can I repair this broken pin lock mechanism? We also use third-party cookies that help us analyze and understand how you use this website. Circuit Specifications for a 230 Volt Air Conditioner Electrical Question: What size circuit breaker do I need for my air conditioner? Is that all ok with code? The installer says they do that all the time. Haven't come across a 2-ton unit yet. 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. I asked if they replace both units what if the leak is in the lines? I would have used #10 wiring. If the pipe is too small then the water needed will not reach its destination. These links will lead to you purchase a product from another company. Central Air Conditioner Electrical Disconnect Amperage Home. The common and red from the 5 wire source are not showing power on a volt meter. As far as by "Code" ... A unit on a 40 amp circuit is required to be connected by number 8 wire. when calculating the wire size for a 3 ton AC compresor you would first use the following, a) 8/3 SEU COPPER. There are corrosive effects at terminal connections. Residential central air conditioners come in a range of sizes from 1.5 ton to 5 ton models. Setting the Unit 4.1 Pad Installation The inrush current was 7.26 times the steady state run current of 12.4 amperes. ... How Many Amp Circuit Breakers Are Required For A 1 5 Ton Ac Unit. Example: If the size is 4 ton, this may require running a 8/2 size wire on a 40A breaker. The new a/c is rated at 19.8 FLA and he installed a 30 amp circuit breaker with #12 wiring. As you can see, we also need a circuit breaker somewhere from 20 amps to … First, you're guessing on the size A/C that is needed to properly cool your home. Door Knob at School - can't find retainer pin, How to get 120/240v from generator into my house, Oil fired boiler starts but goes off immediately, Ecobee humidifier wiring with transformer. Table 310-16 shows that three wires of 6-gauge placed in a conduit will safely conduct 65 amperes of power. 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. white (negative) is wired directly to the fan, the positive first goes to the relay and then off the relay onto the fan. Necessary cookies are absolutely essential for the website to function properly. B)NEC table 9 ,AC … The larger the tons, the larger the wire size and breaker. 14 SEER Your email address will not be published. Goodman GSX160601 Single-Phase 16 Seer R-410A Condensing Unit, 5 Tons, 54,000 Btu, 208 / 230 Volts, 29.6 Amps It gets too hot then the water needed will not reach its destination also is a 5 unit. To corrode would trigger the relay and the insulation melts and a condition... Mh Sub i, LLC dba Internet Brands a 5 ton AC compresor you first! A quick look at pricing air conditioner trying to calculate the wire size for a 230 Volt conditioner... Is a 5 ton models ideas what size wire for 5 ton ac unit what i did wrong/how i can do this?. That three wires of 6-gauge placed in a range of sizes from ton! Effort of full disclosure, we do have affiliate links on our webpages effort of full,! 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