The compressor starts when room stat opens liquid line solenoid and pressure rises thru the txv. It is stopped at 5 psi and on at 18 which is common here for a pump down system. Low side comes up to 70 to 80 and high side drops from 225 roughly to 160 and stalls. This is when the compressor should start but it does not. Unit next to it is on the same circuit and starts easily at 200 over 50.

The TXV is supposed to be compatible with the older one of 18 years. I have been suspect of that but it doesn't make sense to me that it can run so well when the unit is started equalized and not be able to allow it to start at 160 over 70 ` 80 psi.