Alright, I have a customer with a walk-in freezer that is coming out of warranty (we do their normal service work). It has had a problem since Day 1 with the vent port over the door having condensate drip out of it and freeze on and around the door. The heater in the vent is working fine. The door heater is working fine. The gasket has a good seal. It is an indoor box, although the building controls may let the kitchen warm up over night to conserve cooling energy.
Any thoughts on what is causing the vent to constantly drip condensate that freezes?
My thought is the cooling capacity is oversized, not running long enough to dry the air and hence let the air stay at a high humidity creating the condensate to drip out of the vent. I'm in the process of getting data on the box to assess what size cooling equipment it needs.
Any help, thoughts, experience on this would be greatly appreciated. thanks