Check the subcooling. It will be way low if the unit is low on charge. If the subcooling appears normal but the superheat is higher than expected, look for a restriction or bad/improperly adjusted TXV.

 

Does the system have a cap tube or a tev?

Is there a receiver? Is there a sight glass?

 

We need way more information. Mike19 tossed a few out there. Help us help you.

 

Check the door seals.

 

Your working on a freezer coming straight out of defrost. It's normal to frost right away as the termination switch will keep the evap fans off till the coil cools down. Are the fans running? Do you have the lid off the evap case if the evap is on top of the box?
You could always consult a PT chart.

 

Most of those small reach in 404a self contained freezers run a low of 10psi and 175 head average. If compressor and suction line is freezing up on you quick may be Overcharged , check you super and sub

 

What is the box temp once it comes out of defrost? Is the product inside frozen? If yes is the answer to these questions ...look for pressures around 18-20 low side and 200 ish high side. This assuming your condenser coil is CLEAN!

If the box is warm and the then look for slightly higher pressures.

 

How hard is the product? What is the product?
How in hell can the unit be low of freon and be "freezing far to quickly",at the same time??
What does "freezing far to quickly" meen?
Res AC? What is the SCT on a 70*F ambient and a 95*F ambient? It is funny how close the 404 SCT mimics R22/R404a.
The low side is slightly different.

 

Thread is 6 years old :gah: