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Posted by Dann on January 20, 2009 at 15:38:41:
In Reply to: Air cooled condensors posted by Mark Moore on January 19, 2009 at 00:56:13:
Back pressure in a condensor is the total pressure in the system in PSIA. It is calculated off of the barometric pressure. If the barometer is reading 29.8" and the vacuum reads 19.8" your back pressure would be 10 * .496 = 4.96 PSIA back pressure. Your inches of vacuum will most likely follow the barometric pressure and you back pressure should remain constant. If it does not you could have a leak in the system allowing air into the condensor.