Symptoms of a undercharge but think data info is wrong

[bwd111]

Comp discharge temp 170 f
condenser out let 78 f
comp inlet temp 50 f
evap outlet 10
ambient 70f
box temp 20f
comp volts 230 v
comp amps low
low side evap pressure -20 f
high side condensing pressure 86.4

condenser split 10 f
condenser subcooling 2 f
evap super heat 30 f
compressor superheat 70f


Have used two different scales and have weighed refrigerant as per data plate

[idontgetit]

You have not given the delta over the evap, assumming based upon SST and SH you are getting approximately 10 delta over it.

Comp amps low means little, HOW low aka RLA vs actual.

I am with you that it is slightly light on gas, wondering if it was a spun drier and now has something like a cap32 on it which might take 1 or 2 ounces of gas to get it in line.

You left us in the dark on some stuff that makes it tough. How big of a freezer is it, what kinf of gas is in it, tev or cap tube, correct evap fan etc.

Freezer needs to be defined by set point as well, a 0 degree freezer vs an icecream box designed for 15 to 20 below etc.

All that makes it kinda hard to even guess.

[lynn comstock]

Go to 10 or 15°F SC and it will look better. I agree that the drier has likely been upsized.

Also, "high side condensing pressure 86.4" Did you mean high side saturated condensing temperature 86.4°F

[bwd111]

It was a bigger sized filter dryer. Thanks you were correct.