BioCold offers stability freezers suitable for FDA validation in sizes ranging from 24 to 85 cubic feet. Freezers are available in stainless steel or aluminum finishes, all with a solid door, rear wall plenum, and oversized refrigeration system for fast temperature pull-down and recovery times. Using hot gas bypass refrigeration with microprocessor-based PID controls, we are able to control temperature at ± 0.3°C during normal operation. Standard freezers operate in a range of -25°C to 0°C. Additional models to -40°C also available.

The test of a stability freezer is in the defrost cycle. How often is a defrost cycle required? How long does the cycle last? And what is the temperature upset during the defrost cycle?

On our stability freezers, we combine a rear wall plenum with aluminum heatsink on the plenum and floor to achieve a temperature rise of not more than 5°C on defrost.

The frequency of defrost cycles is directly related to the ambient conditions of the facility in which the freezer is located, and the number of door openings throughout the day. The more moisture in the ambient air, the more frost will form on the coil when the door is opened, necessitating more frequent defrost cycles.