But there are a lot of details to consider in the process. Learn all you need to know about AC volts and AMPs here. For the furnace, divide the BTU by the unit’s efficiency as a decimal. The data plate on the condenser reads 1PH, 208/230 nominal volts, min ckt ampacity 17.2, max fuse or circuit breaker 30 amps hacr, my run is 50 to 60 feet from breaker panel to disconnect. With this increased power use, the heat increases. The size of an air handler is related to the size of the condensing unit. An air conditioner’s cooling capacity is expressed in BTUh (British Thermal Units per Hour) or tons (often referred to as “tonnage”). 2-30 amp breakers in the pannel for the heat banks. The main room is 480 sq ft (20×24). Figuring out an accurate HVAC size involves 2 basic steps. Also tested was a 3 ton air conditioner. The breaker size is typically about 125% of the total of the compressor RLA and the condenser fan FLA (full load amperage). A 240 line is needed for the condenser directly to breaker panel with a disconnect at outside unit. There is a small room (8ftx8ft) attached with a sliding door in between. A "ton" is a unit of measurement used by the air conditioning industry. Note: For 10/2 (30 amp) use 1/2″ conduit and for 8/2 (45 amp) use 3/4″ conduit. In the case of a 1500 sq. AC calculator uses your house size (square feet), climate zone, efficiency and equipment type (standard central air vs central heat pump) to show you exactly what size central air unit you need. We had a 2 ton heat pump, wired with 3 circuits. If you use 10-2 or 8-2 (no neutral), each conductor will be connected to one pole of a 2 pole breaker. Don`t want to argue but a 40 amp breaker is perfectly fine. We replaced the unit with a Goodman 3 ton 15c unit. The HVAC contractor hired by my general contractor installed a 3 ton Fujitsu Halcyon outside unit, a 24000 BTU unit in the studio at about 12 feet high. Bummer. ft. home, the air conditioner would need to be 37,500 ÷ 12,000, which comes out to about 3 tons. Currently I have a 220v, 30 amp breaker with 10 AWG Romex. Once you have determined the sizing requirements for the cooling side of your heat pump system, you then need to select the proper supplemental heating element that is included with all of our heat pumps. LG LS120HEV2 12000 BTU Mega Series Single Zone System with Heat Pump. Ac unit called for max size breaker of 30 amps. The ac should be installed prior to any finish work from what is being said here. Method 1: Manual J Calculation. The GSX130241 condenser is a 2 ton AC only 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. Upon calculating your HVAC system size (tonnage), you will be shown a selection of systems that fit your recommended size. So you've determined that your AC is tripping the breaker, but you're clueless as to why. Two very important electrical components to know about are AMPs and volts. In an ideal climate situation, the … Without knowing the specific AC model and the electrical regulations and supply characteristics of your locality, it is not possible to answer your question specifically. Please let me know. Generally, what is the ampacity we see in the field when inspecting an air conditioning compressor circuit? If an ac unit is labeled for a maximum 25 amp breaker and a 30 amp breaker was installed in the panel box would this be considered overfused? The inrush current was 7.26 times the steady state run current of 12.4 amperes. The air handler is a fan blower, that blows the cold or hot air from the condenser unit outside or to the rest of the house. If it's more than 50', run #8-2 or 8-3. Divide the RLA by 5 if it's a newer unit. I am installing a 2.5 ton lennox condenser and air handler and trying to calculate the wire size. You can most likely use 8-2 w/ground. When the air conditioning system is running, if you measured the amperage, it would be roughly 80% of the RLA. The momentary interruption test and the cold load pickup test showed an average inrush current of 90 amperes which lasted for 117 milliseconds. Dirty clogged filters can also cause the breaker … Larger wire means less resistance or Ohms as well. Kevin, according to the specs for the air conditioner the circuit that should be installed would be a 30 amp 230 volt circuit using 10/2 cable with ground. What Size Home Would Use a 2.5-Ton A/C Unit?. Wrong yes, but what are the consequences? For the air conditioner, divide the number by 12,000 to determine the tonnage required. The best way to determine the perfect HVAC unit size is to have a Manual J calculation done for your house. These factors include the extent of exposure to the sun and the outside air, the thickness, and type of outside wall insulation, the size of the house, type and number of windows and outside doors, the ceiling height, the age of the house construction etc. Long–line – up to 250 feet (76.20 m) total equivalent length, up to 200 feet (60.96 m) condenser above evaporator, or up to 80 ft. (24.38 m) evaporator above condenser … I know this has been tackled on this sub before, (without a consensus being reached in the comments) but I need to talk about wire sizing and breaker sizing on residential condensers. A retired electrician friend of mine was looking at it all after installation and said that the info. The Circuit Breaker Size for a 230 Volt Air Conditioner. Electrical AC Power (Usually labeled L1, L2, and Ground) 2… DC Control Voltage (Usually labeled 1, 2 ,3) The AC electrical voltage will be 110-120 or 220-230 Volts. Step 2: The air conditioner disconnect is connected to the air conditioner condenser with liquid-tight flexible metallic conduit, as shown in Figure 2. I had a question regarding the ac unit maximum breaker. The rating plate says: Voltage: 208/230. In the heat of the summer, one thing's sure to keep you cool and comfortable: a properly sized air conditioner. Residential central air conditioners come in a range of sizes from 1.5 ton to 5 ton models. Max. Ameristar™ M4AC4024D1000A - Air Conditioner, 2 Ton, 14 SEER, R410A, 208-230/1/60 Skip to the end of the images gallery Skip to the beginning of the images gallery When shopping for a new air conditioner, there are many different technical specs to think about. 3.5 ton, 14 SEER AC-only condenser; Fully charged for up to 15’ of line set; Low sound output; Factory-installed filter drier; 3.5 ton. The circuit breaker for this air conditioner circuit should be a 2-pole 30 amp breaker. Thanks. 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