I have a Carrier 7.5 ton Heat Pump that suffered a severe burnout. I was really careful in the compressor change following all recommendations from Copeland on clean up,etc. It is a Scroll compressor and when I went back to start it up after charging by weight with R-22, the suction went to zero and the head pressure was unchanged,holding steady at 50 psig. The suction pressure goes back to 45 psig when the system is cut off. Cant run it long because I dont want the scroll going into a vacuum I m thinking a blockage somewhere but dont really know where to start. Looking for some other opinons to help me figure out where to begin. This is a 10 year old unit and compressor number 2. Trying to prevent compressor number 3 from occurring.