Jeff, I almost made a quick reply last night but I knew there was more to what you were saying than I was understanding. So I just sat and continued to work things out in my head. And I think I understand more now. Thank you for your replies they are shaping my view of HVAC everytime.
I think my biggest mental block was that I didn't think that going over about 55psi suction was a good thing. My goal was it to run with as little power as possible, BUT if I'm not making heat then I'm wasting power.
SO I open up the needle valve and charged to 235psi discharge and 90psi suction, and it made a HUGE difference. In fact it dropped my suction temp to 59F. I will need to make my cap tube even shorter to go much more than that though.
I believe I still need a larger compressor, like the 10,500btu I had (
).
So I'm still looking and will make a few changes to see if I can get this design to work before I hack the PTAC.
I am also worried I might over power my condenser?
Thanks again