I inherited another companys headache, I have a small walkin Freezer that will not cool below 0 degrees. This was originally an R12 unit converted for use with 409, new TXV (by others) The unit runs continuously, the following info is what I have:
Box Temp at time of readings 2 degrees
Suction Pressure 4.5 psi
Liquid line 195psi
Ambient air is 95 degrees
Superheat 18-20 degrees at compressor
( No evap sh due to no pressure tap, I will add if needed)
Rated at 6600 btu (Txv Rated at 1 ton)
Compressor will draw a vacuum down to 9"
Didnt measure subcooling due to unit having a receiver and no tap between condenser and receiver.
Any ideas would be appreciated.