639 Louisiana (New Orleans) Second Class Stationary Refrigeration Louisiana’s Second Class Stationary Refrigeration exam (639) zeroes in on mechanical systems within fixed installations? compressor operation, heat exchange principles, and pressure vessel safety. You’ll need working knowledge of EPA refrigerant regulations, piping design for commercial coolers, and troubleshooting common failures in ammonia or synthetic systems. Electrical controls and safety protocols round out the practical scope.
| Exam Name | 639 Louisiana (New Orleans) Second Class Stationary Refrigeration |
| Format | PDF & Practice Test Engine |
| Target Year | 2026 Updated |
| Features | 100% Verified Q&As |
