In this case, it's a coldwall box, and the evaporator is not changable.
Cap tube system, so there is no TXV to adjust.
Christopher A. Young
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On a lot of of freezers, the
evaporator is actually part of the case and there is no practical way to
remove it. In something like a walk in freezer, the TVX can be changed
out to match the new refrigerant and condensing unit being used. Quite
often, the compressor can handle different refrigerants and if it is a
semi-hermetic, it's very easy to drain the oil and replace
it with an oil compatible with a different refrigerant. Been there, done