Okay take it easy on me this is my first post. I have a Goodman 7.5 ton outdoor unit (GSH100903AB) and a Carrier indoor AHU (40BA008300). Here's problem I am having whenever the outside units fan comes on the LL pressure drops right off (8 seconds) SL right after. Neither Goodman or Carrier are giving me much help on trying to find out the correct charge. If I block the air to the outside unit and let the fan run I get these numbers, OSA Temp 63 Suction psi 41 SLT 64.8 High side 172 LLT 91, RADB 72.4 RAWB 62.3, SADB 60.4 SAWB 55.2, air across evaporator 2875 cfm. Not so bad on the btu output I come up with around 80,000. The original TXV was a non adjustable one so installed a adjustable one same problem I have really high subcooling and no super heat. Thanks for your input
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