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You have a restriction in the system or a overcharge.
Recover the system.
Replace the filter/drier.
Pull a deep vacuum.
Recharge according to the nameplate charge.
This problem could be cause by a few things. Can you tell me if your condenser is clean? If it is dirty, the heat cannot be rejected. Will you feel the large copper line going to the compressor and tell me if it is cold to the touch? If it is not col and your compressor is running you may be low on refrigerant. Also, is the evaporator frozen over? If your evaporator is frozen over you might be low on refrigerant, or you evap fans may be out.
The refrigerant level is low. The only thing is that the unit may not have a low charge. There can be several things that cause the unit not to refrigerate properly. It could have weak valves in the compressor or even a bad TXV(thermostatic expansion valve). Have you had this box repaired yet.? I see that this is an old post.
The first place to look is to check the charge. Using guages check the low and high side pressures and their relationship to one another. I'm assuming your unit is a R-404 unit which, if fully charged and the condenser is clean, and the fan is operating, should have about 210 to 250 high side pressure. Other things to check: evaporator coil ice/frost free; defrosting properly to obtain a clean coil; all evaporator fans running. If low side pressure is above 30 PSI you have a weak compressor. Whatever, fix the Traulsen unit, its head and shoulders above anything else on the market today.
I have worked in a lot of kitchens and don't really have a preferance. The top mounted compressor is better for you as it is easier to service and leaves more cabinet room. Dirt and dust also stay near the floor. YOu won't have to clean the filter as often up high The disadvantage to this in a kitchen is that kitchens are hot and up high is hotter still. Order a cheaper model. No glass doors, no stainless steel. You don't need these features.
Turn cold control to Max. This keeps your compressor running for this troubleshooting exercise. Find and manually advance the defrost timer with a screwdriver or something similar. This will shut the compressor down and bring the defrost heater on. If this happens then you will know that your timer is bad.
If it is not that, the next thing to look at is the defrost heater itself or the thermal overload on your defrost heater. This keeps your defroster from overheating.
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