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Precharge
jasmarie1
Sep 13, 2010, 03:41 PM
I bought a 3 year old heat pump its new never been use but it has 300 pounds of pressure in it could it be precharge with nitrogen or freon
hvac1000
Sep 14, 2010, 03:31 PM
Usually it is a refrigerant charge IF the charge it contains if from the factory. Usually R-22 or R-410A.