Refrigeration & Air Conditioning Mechanic Red Seal · Question
During the commissioning of a new commercial constant air volume (CAV) system, air balance readings indicate significantly lower airflow at the farthest supply diffusers compared to those closer to the air handling unit. What is the most effective initial adjustment to address this common issue?
To achieve proper air distribution in a CAV system, balancing dampers are used to restrict airflow to closer diffusers, thereby pushing more air to the farther
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Question: During the commissioning of a new commercial constant air volume (CAV) system, air balance readings indicate significantly lower airflow at the farthest supply diffusers compared to those closer to the air handling unit. What is the most effective initial adjustment to address this common issue?
Answer options:
- Increase the outdoor air intake damper opening.
- Adjust the supply fan's variable frequency drive (VFD) to a higher speed. ✅ Adjust the balancing dampers on the ductwork closer to the air handler.
- Add a bypass damper to the main supply duct.
Correct answer: Adjust the balancing dampers on the ductwork closer to the air handler.
Explanation: To achieve proper air distribution in a CAV system, balancing dampers are used to restrict airflow to closer diffusers, thereby pushing more air to the farther ones. Starting with adjustments on dampers closer to the air handler is a standard air balancing practice.
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