Commercial walkin condenser freezing up

There are lots of reasons a condenser will freeze up, low refrigerant, blocked air flow, fan or blower running slow or if the compressor is outside and the outside air temperature is to low.
I have a walk in cooler at work and all the things listed above were OK, but the unit would freeze up from time to time. I noticed it happened on humid days and when we placed items that would sweat a lot (beer kegs) into the cooler. We had employees keep the door closed as much as possible while going in and out. We also replaced the insulation around the door. There are lots of reasons a condenser will freeze up, low refrigerant, blocked air flow, fan or blower running slow or if the compressor is outside and the outside air temperature is to low.
I have a walk in cooler at work and all the things listed above were OK, but the unit would freeze up from time to time. I noticed it happened on humid days and when we placed items that would sweat a lot (beer kegs) into the cooler. We had employees keep the door closed as much as possible while going in and out. We also replaced the insulation around the door.

Install timer on it

Install timer on it