Jim
What refrigerant are you using? My system works great for 30 mins & then my high side pressures go thru the roof & I lose cooling? I know it is hooked up correctly as it works well when i first charge the system.
I have spent many hours trying to figure it out. I am wondering if the industrial 12a I am using is to cold for the txv orfice causing freeze up? May need to try 134a? Unfortunately I would have to spend a $150 just to try it because we can not buy it in the store here.

Thanks Barry