Customer received the unit with major leak, which i fixed. I used to test leak and recharged with vapor side of 404 tank, like a dummy... Then, I had evap coils freezing up and fluctuating head pressure so i replaced the expansion valve. I realize charging with vapor may have been my problem all along. Alright, it was dumb, but i had not worked with 404 before... Once i realized the mistake, after replacing expansion valve, i vac'd the unit, then recharged with liquid from the same tank i had pulled the vapor from. Now, the head pressure is shooting to 450 and pressure relief valve land like an obstruction in the line. Could this be related to the usage of the same tank?! Or, would it cause the unit to do something else? Doesn't the new sympton sound like an obstruction?
Please help and sound off!
Just don't flame me too much, though, y'all!