Precedent 3 to 10 Tons Trane customers demand products that provide exceptional reliability, meet stringent performance requirements, and are competitively priced. Trane delivers with Precedent. Trane rooftop units range from 3 to 10 tons. product is available in gas/electric, cooling with electric heat orTrane customers have been instrumental in setting the standard for a product that provides exceptional reliability, meets stringent performance requirements and is competitively priced. Trane rooftop units, Precedent, feature cutting edge technologies: reliable compressors, Trane engineered ReliaTel™ controls, computer-aided run testing, and Integrated Comfort™ Systems. For Technical Specifications, please refer to the Catalog or Installation documents on the Literature tab. Drawings Terms and Conditions Trane, in offering the Trane Product Templates, accepts no responsibility or liability: for any use made of the Product Templates including any modification thereto made by the user, for the design of buildings and related systems made using the Product Templates, or for the accuracy of the Product Templates or any data resulting from the use thereof.

While Trane strives to ensure that its Product Templates are accurate, this accuracy is not guaranteed. The user is responsible to review the Product Template and to determine if use of the Product Template is appropriate to and meets the requirements of the user's application. In accordance with its policy of continuous improvement, Trane reserves the right to modify its Product Templates at any time without notice. Trane makes no warranty whatsoever, express or implied and including, but not limited to, any warranty of merchantability or fitness for a particular purpose with respect to the Trane Product Templates or their use and in no event shall Trane be liable for any incidental or consequential damages relating to such Product Templates or their use. The Same Trane Quality with Added Flexibility Cooling and Gas/Electric, 60 Hz Heat Pump, 60 Hz 5 to 10 Ton, 50 Hz Tracer™TD-5 Display for ReliaTel™ Controller Cooling and Gas/Electric, Standard Efficiency

Cooling and Gas/Electric, High EfficiencyHow To Get Rid Of Buildup In Toilet Bowl A few years ago, a student of mine told a funny story in a home energy rater class. Tips To Lose Weight Faster On Weight WatchersHe was an HVAC contractor and said he was installing a new air conditioner for an elderly woman. Used Furniture Memphis AreaAs he was explaining things to her, he mentioned that they would be installing a 4 ton unit. "Oh, my," she said. "How are you going to get something so big into my backyard?" The confusion here is completely natural. HVAC and home energy pros find this story funny because when you say an air conditioner is 4 tons, we know it's not weight. It's a number that tells how much heat the air conditioner can remove from the house in an hour.

(Let's ignore the issues of nominal vs. actual capacity and AHRI de-rating.) A 4 ton air conditioner is one that can remove 48,000 BTUs of heat per hour from the house. For most people, though, 4 tons means 8000 pounds. (A BTU is a British Thermal Unit, approximately the amount of heat you get from burning one kitchen match all the way down.) Most pros also know how such a common term as 'ton' turned into a bit of HVAC jargon. Before Willis Carrier invented the modern air conditioner, people used to cool buildings in the summertime with ice harvested from rivers and lakes in the wintertime. A Green Homes America article quotes ice production figures from the 19th century Ice and Refrigeration journal, indicating that the 1890 crop from the Hudson River was about 4 million tons. OK, so people used to cool and refrigerate with ice. How does that equate to air conditioning capacity in BTUs per hour, you ask? Well, let's get quantitative and find out. When ice is below freezing and it absorbs heat, the temperature increases.

When ice is at its melting point, 32° F, and it absorbs heat, its temperature doesn't change. If you've had a physics or chemistry class, you may recall that the amount of heat needed to melt ice is called the latent heat of fusion. In Imperial units, that number is 143 BTUs per pound. That's actually a lot of heat to pump into a pound frozen water. Once the ice is melted into liquid water, it takes only 1 BTU per pound to raise the temperature 1 degree. So if you've got a pound of ice at 32° F, you put 143 BTUs into it to melt it completely. Then it takes only 180 more BTUs to raise the temperature of that pound of water from 32° F to 212° F, the boiling point. Anyway, getting back to our main discussion, if you have a ton of ice, it takes (143 BTU/lb) x (2000 lbs) = 286,000 BTUs to melt it completely. You could do that in one hour or 10 hours or a year, depending on how quickly you pump heat into it. Somewhere along the line, though, someone decided to use 1 day—24 hours—as the standard time reference here.

If the ice melts uniformly over the 24 hours, it absorbs heat at the rate of 286,000 / 24 hrs = 11,917 BTU/hr. Rounding that number up makes it a nice, round 12,000 BTU/hr. In air conditioning jargon, then, a ton of AC capacity is equal to 12,000 BTU/hr. If you're wondering how this term got institutionalized, it was probably the usual way. People in the industry start using it, and then the professional organizations make it official. An architecture website has a quote from 1912 that claims the American Society of Mechanical Engineers standardized it. It sounds likely, but their numbers don't work out, so I'm gonna go with Honest Abe on this one and remain skeptical. For the fearless: If you want to read some funny HVAC banter on this topic, check out this thread in the HVAC-Talk forum. And if you figure out what 'heat of zaporization' is, let me know! It's Called an Air Conditioner — Not an Air Cooler! 5 Questions to Ask When Replacing Your Air Conditioner