Build and service refrigeration systems and handle refrigerants. Includes professional execution to standards and manufacturer specifications, appropriate measuring and testing steps, occupational safety, and complete documentation of the work performed.Build and service refrigeration systems and handle refrigerants. Includes professional execution to standards and manufacturer specifications, appropriate measuring and testing steps, occupational safety, and complete documentation of the work performed.Build and service refrigeration systems and handle refrigerants. Includes professional execution to standards and manufacturer specifications, appropriate measuring and testing steps, occupational safety, and complete documentation of the work performed.