I have a new evap coil that is set up for R410 (TXV installed from mfg). My question is, could I convert this coil to r22? Is it just a matter of switching the TXV valve? Would I need to do some type of flush on this coil. The reason being is the condensor is only few years old and r22 seems to be such a more reliable coolant. Especially that there new substitutes in the market. I await your replies. Thanks!!