There have been several recent threads that have made me think about this setup in a new light.

The system has 3 boxes each with holdover plates, the refrigerant passes through each one in turn and running temps in each box are:-
Freezer -10 to -12C (2 plates at -20C)
Refrigerator 2 to 4C (plate -6C)
Salad Chiller 4 to 8C (plate -4C)

But the TXV is inside the freezer and the bulb is inside the Chiller so once the system's down to temps one must assume that the TXV will be sensing the diaphragm temperature and not the bulb's at some instant. Maybe as the system cools down further on cycle the bulb see temps lower than than the freezer?

However, it works, but is very susceptible to charge.

I've already got the message that it may be better to get the TXV say into the chiller but why does it work as it is? Any ideas

Chef

Oh - its R134 and running Dx = 125PSI and Sx = 2PSI