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Please check out this link: https://www.google.com/search?source=hp&ei=NUC-X-vFAcGV_Qbt-oqgDQ&q=LRA+195+in+tonnage&oq=LRA+195+in+tonnage&gs_lcp=CgZwc3ktYWIQA1DIDFjIDGCWE2gAcAB4AIABzQKIAe0EkgEFMi0xLjGYAQCgAQKgAQGqAQdnd3Mtd2l6sAEA&sclient=psy-ab&ved=0ahUKEwirtOT5y53tAhXBSt8KHW29AtQQ4dUDCAc&uact=5
That makes no sense. LRA is going to be for a motor or compressor. I've never heard of a 20562 BTU machine. You have to read the data plate on the machine, either indoor or outdoor unit will tell you. If you can't read the data plate turn the power off and look at the data plate on the actual motor itself. Good Luck!!
LRA on the data tag stands for "locked rotor amps" and has nothing to do with tonnage. In the model # there should be a number to use. And divide that # by 12 (12,000 btu/ton). So if I had a PFG24H200 it would be the "24"and a 2 ton unit
the formulae for the surface area of round disc is pi * r * r where pi=3.14 and r =radious of disc= diametre/2
for this 1st u have 2 calculate the radious of the disc that is 180/2=90mm then convert it to m by dividing 1000 ,so radious=90/1000=0.09 m finally calculate the area= 3.14 * 0.09 * 0.09=0.025434 sq metres for 38 disc multiply 38 with the above area that is 0.025434 * 38=0.966492 sq metres
in excel 2007 u can do it more easily by going 2 formulas tab. Under formla tab click on engineering formula and then convert here u can convert from mm to m after converting use the above formula i just told u.
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