I was called out in the fall I found the condenser txv bulb was broke off. Now they have someone staying there and want it fixed. I went to local armstrong dealer got txv put it on. Run great in heat. As soon as you switch over to ac the pressures, both head and suction, Fall to 0 fast. Pressures taken at the lineset.
So I pulled the indoor orfice it was clean, I took the coil loose and blew nitrogen through it. It apeared to be open. So I started calling friends all of them say coil stopped up. Boss said coil stopped up Change it out, I changed it out I still have same problem.
I called the armstrong dealer and checked part numbers they said they give me the wrong txv. The one I need has a different superheat. I ask if this was a txv for a heat pump or straight cooling. they said heat pump. My problem is the condenser superheat shouldn't matter as long as it is bypassing in a/c. Now Im going to next town over to get another txv from armstrong dealer. and try it out on monday. any ideals will be of great help