Given the following situation, leak checking an air-cooled chiller operating with 134a and one circuit is flat. Charge 5-8 lbs of 134a bring system pressure up to approx 25 psig. Topoff with nitrogen to 200 psig. Evaporator temp is 52 deg F and outside air temp is 49 deg F. Since the 134a was already superheated, and raising the vapor condensing pressure to 200 psig which corelates to 130 deg F for 134a, wouldn't the 134a condense on the colder surfaces rendering the trace charge unusable??????? Have been looking at Dalton's Law, but still do not have a clear understanding. Any articles, publications would be greatly appreciated. Unless one of you fine people could clearify this for me! Remember....this is only a theory....