Changed out the condenser coil today. Coil had a leak. The desiccant started falling out of the dryer’s inlet. Didn't look like it was coming from the outlet. We installed a new drier and weighed in the refrigerant plus one pound:
Head was 210 psig with 14 degrees SC
Back was 33 psig with zero degrees SH
No delta T across the drier or LLS
All inlet orifices to the evap where frosting
Some return elbows where wet some where dry
Top half of suction header was 72 degrees
Bottom half of suction header was frosted
Good airflow with tight belt
Fire dampers open.
Bottom two row of evap frosted
Compressor cut off due to freeze stat on evap
Unit equalizes after unit satisfies.
I think some of the orifices are restricted and the liquid is being forced through the others and not boiling off in the evap