3 Ton Rheem 16 SEER R-410A Air Conditioner Condenser (Classic Series) Customers who bought this product also commonly purchased the following combination of items. Rheem 200 Series Programmable Multi-Stage Thermostat (3 Heat / 2 Cool) 2.5 and 3 Ton Rheem R-410A Multi-Position Cased Evaporator Coil (17.5"W) It's been hot and muggy in Atlanta the past few days. Now I'm not your typical Atlantan who says that lightly. I grew up in Houston and south Louisiana and spent nine years in Florida, so I know hot and muggy. Overall, summers in Atlanta are pretty nice because of our elevation (~1000 feet), but we do have our moments. Anyway, it's been hot enough that we've hit our summer design temperature, which is defined as the temperature exceeded only 1% of the time. In Atlanta, the summer design temperature is 92 degrees Fahrenheit. That's the temperature at which air conditioners ideally will provide exactly as much cooling as the house needs, when sized according to the Manual J cooling load calculation protocol developed by ACCA, the Air Conditioning Contractors of America.

When outdoor conditions are at the design temperature, an air conditioner should run pretty much continuously and be able to keep the house at the ACCA recommended indoor design temperature of 75 degrees Fahrenheit. When outdoor conditions go above the design temperature, the AC should run continuously and not quite keep the house at 75 degrees. Now, the thing is, Manual J has some built in oversizing, so even if the air conditioner were sized according to an accurately performed Manual J load calculation, it's not going to run continuously at the summer design temperature. It should run long enough to make the house comfortable, however. Last week I wrote about the 4 factors of comfort, temperature and humidity being the first two. An air conditioner actually does two jobs - it lowers the temperature and removes moisture from the air, thus taking care of the first two factors, with HVAC design anyway. To remove the moisture, however, the air conditioner needs long runtimes.

That's because the air moving over the cold evaporator coil causes the water vapor to condense. The more air moves over the coil, the more water condenses out and gets carried away. It takes about 15 minutes of runtime before you start getting serious dehumidification of the air, so oversized systems will not dehumidify well. If the AC comes on, runs 10 minutes or less, and then shuts off, the house may be cool, but in a humid climate, the indoor humidity levels will stay high, probably over 60%. I know this from personal experience. Last year we replaced the AC in our condo, and I did the Manual J load calculation. The result was that we needed a 1.6 ton air conditioner for our 1500 square feet, so we had a 2 ton system installed. Knowing that Manual J has a built-in oversizing bias, I wanted to go with the 1.5 ton system, but I chickened out. Our AC runs maybe 15 minutes max on a hot afternoon, and our relative humidity stays around 60%. The Manual J bias is real, and it's not small.

And that's with an accurate HVAC load calculation. I've seen plenty of load calculations that use incorrect inputs so the contractor can come up with a cooling load to match the AC size he wants to install. Now, back to the point of this article - how to tell if you have an oversized air conditioner. Just get your stop watch and time how long the AC runs on a hot afternoon. Ten minutes or less, and it's definitely oversized. Twenty minutes would be OK. Thirty minutes at a time or longer, and your humidity levels should be fairly low.home ac unit freon leak So, how long does your air conditioner run on a hot day?furnace blower motor wrong direction See my followup article with real data on our AC runtimes:bmw e36 ac control module

My Big Fat Oversized Air Conditioner Kelvinator Residential 3-Ton 14-SEER Central Air Conditioner ENERGY STAR Item # 577361 Model # JS4BE-036KA Rheem (AHRI 7491808) 3 Ton, 16 SEER, Classic Series, RA1436AJ/RH1T3621 Air Conditioner Split System Rheem RA1436AJ1NA - Classic 3 Ton 14 SEER Condenser, 208-230 Volt, 1 Phase, 60 Hz Rheem RH1T3621MTANJA - 3 Ton, R-410A, Single Stage, Aluminum Air Handler, Constant Torque Motor, 208/240V, 1 Ph, 60 Hz System includesOne RA1436AJ1NA Rheem - Classic 3 Ton 14 SEER Condenser, 208-230 Volt, 1 Phase, 60 HzRheem Classic® RA14 Series Air conditionersFeatures:New composite base pan - dampens sound, captures louver panels, eliminates corrosion and reduces number of fasteners neededPowder coat paint system - for a long lasting professional finishScroll compressor - uses 70% fewer moving parts for higher efficiency and increased reliabilityModern cabinet aesthetics - increased curb appeal with visually appealing designCurved louver panels - provide ultimate coil protection

External gauge port access - allows easy connection of "low-loss" gauge portsSingle-row condenser coil - makes unit lighter and allows thorough coil cleaning to maintain "out of the box" performance35% fewer cabinet fasteners and fastener-free base - allow for faster access to internal components and hassle-free panel removalService trays - hold fasteners or caps during service callsQR code - provides technical information on demand for faster service callsFan motor harness with extra long wires allows unit top to be removed without disconnecting fan wire.AndOne RH1T3621MTANJA Rheem - 3 Ton, R-410A, Single Stage, Aluminum Air Handler, Constant Torque Motor, 208/240V, 1 Ph, 60 HzRH1T- Series, Constant Torque Motor, Efficiencies up to 16 SEER.RH1T features:A Constant Torque motor which provides enhanced SEER performance with most Rheem outdoor units.Field-installed auxiliary electric heater kits (not included) provide exact heat for indoor comfort. General Terms Of Limited WarrantyConditional Parts (Registration Required): Ten (10) YearsRheem will furnish a replacement for any part of this product which fails in normal use and service within the applicable period stated, in accordance with the terms of the limited warranty.