Blue Seal Refrigeration Overview:

The Blue Seal 2-C refrigeration license is categorized into either toxic or non-toxic.

Requirements: Blue Seal Refrigeration Engineer 2-C Toxic:

The Blue Seal 2-C toxic license is required for refrigeration systems that contain a flammable, or toxic refrigerant. The plant must have a total capacity of at least 24 tons and up to 65 tons. 

Toxic (Group II) Refrigerants Include: R-123 and R-717 (Ammonia).

Requirements: Blue Seal Refrigeration Engineer 2-C Non-Toxic:

The Blue Seal 2-C non-toxic license is not required to operate a plant with a non-toxic refrigerant. However, this license can be obtained if you work in a plant, with 6 months experience, and at least 250 tons capacity.

Non-Toxic Refrigerants: R-11, R-12, R22, and R134A. 


The application will require a management endorsement along with two engineer endorsements. These are engineers who hold a valid Blue, Red, or Gold Seal license.  Engineer endorsements are not required for non-toxic licenses.

Application and Test:

Your application will contain all of your refrigeration information, which can be found on your refrigeration certificates of inspection (COI) located in your plant. These are typically posted on the wall near your equipment or in your glass case.

The New Jersey State Exam is a scantron-style, 50-question (multiple-choice) test. A 70% or better is required for a passing grade.

The Course:

The program consists of 4 classes. 3 of them are 2-hour lectures with the fourth course involving practice testing. The course covers refrigeration fundamentals, refrigeration systems; theory; and operation. An online program is included and required for test preparation.