Tips for Technicians
Commissioning isn’t just the final step in an installation - it’s the foundation for long-term system performance. When done correctly, it ensures the system operates at peak efficiency, prevents unnecessary breakdowns, and reduces costly call-backs. Yet in the field, commissioning is too often rushed, incomplete, or overlooked entirely. This blog outlines why commissioning matters, common mistakes technicians make, and a step-by-step approach to doing it right, every time.
Why Proper Commissioning Matters
Commissioning is the process of verifying that a system is installed and performing according to design specifications. It ensures:
Proper airflow and balanced distribution
Leak-free and moisture-free operation
Safe and optimized electrical performance
Skipping or shortcutting commissioning introduces long-term risk, compromised efficiency, customer dissatisfaction, and potential system failure.
Commissioning Checklist
Commissioning starts with pulling a deep vacuum, verified using a digital vacuum gauge. After isolating the pump, perform a vacuum decay test to make sure there are no leaks and the system is fully dry. If the pressure rises quickly, it likely means there’s leftover moisture or a small leak—both of which can cause long-term damage like acid buildup or compressor failure. Skipping this step might seem faster, but it often leads to bigger, more expensive problems later.
It’s just as important to check airflow and refrigerant charge using actual measurements. Use a manometer to measure total external static pressure, or an anemometer to compare airflow with the manufacturer's specs. Always charge refrigerant according to manufacturer guidelines and confirm it with pressure and temperature readings.
Common Commissioning Mistakes to Avoid
Many system issues can be traced back to poor or incomplete commissioning. Common pitfalls include:
Skipping vacuum decay tests
Not using vacuum gauges
Guessing refrigerant charge
Neglecting airflow balance
Failing to record voltage and current draw
Relying on assumptions rather than data
In Summary
Commissioning is not a task to rush or overlook—it’s a core part of professional HVACR work. When done thoroughly, it sets a standard for reliability, efficiency, and performance that both technicians and clients can count on.
Taking the time to commission systems correctly from the beginning reduces troubleshooting later and elevates your reputation as a technician who does it right the first time.
At Fieldpiece, we design tools that help technicians like you commission right the first time. Whether you're diagnosing a tricky system or ensuring peak performance on every job, our precision instruments make your work easier, faster, and better.
Stay tuned for more Tips for Technicians to help you tackle the toughest field challenges.