Simplot at Bathurst is a leading food processor of products including Edgles Birdseye and Chico rolls and although inland, they are exposed to enough moisture to cause ice problems in -20C stores. The site has multiple entrances and the use of Desiccants to reduce the incoming dewpoint was the final solution.
Seibu Giken DST model RA061R (1450m3/hr) desiccant dehumidifier is a reliable option, as it is electro-mechanical control means it can be locally serviced without circuit cards to confuse any diagnosis. Its stainless steel construction is also useful in food-grade areas that are frequently washed. Installed into the dock area and able to remove 10kg/h or water vapour, the units would control to 0Cdp at doc temperatures around 10C. With the dry air directed towards the freezer door at -30Cdp the dryness of the infiltrating air would be adequate to avoid icing issues.