Had a call today for a warm walk in. Found unit low on charge. Located and repaired leak service valve packing nut. Also added a cap. Now...on to the problem.
Charged 408a to full sight glass.
Suction pressure - 30 (0*)
Head Pressure - 320 (128*)
Superheat - 56* at condensing unit (couldn't easily get to suction at TXV bulb)
Subcooling - 15*
Ambient - 93*
Box - 50* (at time of these readings)
It was cooling very well, but I couldn't wait to see the final temp because we were so backed up today. I left it this way assuming that since the box was warm, the TXV was punched wide open and alowing the high superheat. I figured that when the temp came down, the TXV would close, and also allow higher subcooling. I saw the box pull down to about 30* before I left from the 70* that it was when I got there. The product is already ruined, so if it doesn't cool completely over the weekend it isn't a big deal, but it would be nice if I knew that it would be fine.
I should know this, but I'm really out of it today, so I bring it to you all.