Hello, I have a Dunham bush vertical screw compressor, with a sub cooler, that feeds a air handler with a VFD. The air handler has a DX coil with six circuits, and three liquid line solenoids for capacity control. The problem I have is that when the building gets close to full load conditions the txv hunts so bad that we loss capacity and then the building. The suction pressure runs about 80 to 85 psig, and the superheat fluctuates between 2 and 35 degrees. The equipment is 22 years old and as they stuff more people and equipment in the building the capacity issue just gets worse. If i could figure a way to keep the superheat from letting the coil warm up to 70 -75 and then back down to 45 -48 i think we would eliminate the lack of capacity. Does any body have a good idea, that could help me. PS the txv valve is a alco valve. Some circuits work better than others but most hut really bad, and yes I have tried to adjust the superheat setting on the TXV. Thanks for your help.