I have a 12 ton R22 heatpump that has the above mentioned TXV installed. Unit works great in cooling but does not operate correctly in heat mode. Based on what I can find so far I believe this is an improper valve for a heatpump application. I searched here and Sporlan but could not find a definitive answer. I belive this to be an AC only valve and not a bi-directional as required on a heatpump. Can some one confirm this for me? Thanks