Copper Refrigerant Lineset and Insulation for 1.5 - 2.5 Ton Systems For air conditioners and heat pumps, we size the wires and circuit breakers in accordance with the information printed on the label, not the simplified sizing charts that we typically rely on. Although they are easier to install than central air conditioning, they are not “plug ‘n play” like window units. This information will be available in the specifications. Her focus is on construction planning and design as well as project cost estimating. You can see the green, black, and red wires connect the terminal blocks on the bottom right. All Rights Reserved. Prices for central air units vary primary based on size (tonnage). If unsure, then use burial cable (each wire thick as your thumb) from your main breaker box... and install a separate . Mini split systems require a dedicated electrical line into the building’s electrical panel. So the new formula looks like this: ((2,350 x 25) / 12,000) + 0.5) = 5.39. The only reasons you don’t want a larger size unit is because it costs more upfront. If you don’t mind – what is the square footage that you used in calculations? Larger wire means less resistance or Ohms as well. Especially if you are willing to spend extra money on a premium brand name AC unit, such as Carrier, don’t try to squeeze a few hundred dollars of savings by hiring a sub-par installer. Thanks Mickey! You would need a 2.5 ton AC unit for your house. If you need to cool just a single room then a central AC may not be the best or most cost efficient system for you. Exact wire specifications depends on your units needs. Heat transfer between walls and through the concrete slab, Costs more upfront – you can overspend by about $800+, Doesn’t get rid of humidity as well as a properly sized unit, especially in very hot climates, Cycles on and off many times throughout the day, thereby creating more wear and tear on the unit, Will not keep your house at a comfortably cool temperature on the hottest days, Running all the time instead of cycling will drastically increase your electric bill. So all the power I need for these units is whay goes to outside unit? * Voltage depends on the system. AC Unit Size Calculator accurately estimates the size of the central air conditioner unit you should install in your house. Over the open beam there is 2 inch Styrofoam 1 inch plywood roofing felt and medium brown asphalt shingles. While I don’t know how you did the calculations and what values you used, I generally would recommend with 4 ton instead, because most specifiers / contractors and even homeowners overestimate what they really need for capacity, and in the end spend much more than they need, in operating costs. Pro Tip: its best for you to ask him to actually perform a complete Manual J assessment (they have the software program that runs it). So if you have a 2-ton A/C with a 2-ton coil, it is good for a certain amount of cfm passing through, which can cool a home of a certain number of square feet. Great electric advice, THANKS! Otherwise, the system will not operate correctly. You should not trust an HVAC contractor who does a quick walk through your home, and gives you the AC tonnage your home needs just off the top of his head. Very helpful for those who want to be a expert ac technician. Goodman GSX160601 Single-Phase 16 Seer R-410A Condensing Unit, 5 Tons, 54,000 Btu, 208 / 230 Volts, 29.6 Amps. Are the indoor units just basically low current devices – small fans & condensate pumps (no electrical heating elements, etc. So you would want to install a 3.5 ton unit. The voltage range for this wire falls between 0 volts and 2,000 volts. But my question is, what wire do I need to run from the main panel to the outdoor box since I’m installing 2 multi split systems? An electrical whip is a premade, outdoor grade wire set that is intended to run from a shutoff box to the unit being installed. In any case, I pulled my switch out and turned it upside down and my unit works now and my switch now looks like the downstairs switch. Now that the house and the bonus room are complete I checked and the builder only ran a 12-2 wire (2 insulated wires and a bare ground). Is it okay to use a mini-split ceiling cassette with a 115V condenser? NOTE: These instructions are in regards to electrical specifications only, and do not include line set installation or refrigerant set-up. Another major benefit is that a mini split AC system can be installed DIY, which is not possible with central air.