Refrigeration & Air Conditioning Mechanic Red Seal · Question
A building management system (BMS) for a commercial HVAC system indicates a high differential pressure across the coil of a rooftop unit's air handler. The outdoor air damper is functioning correctly. What is the most probable cause?
A high differential pressure across a coil in an air handler indicates restricted airflow. The most common and easily rectifiable cause is a dirty or clogged ai
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Question: A building management system (BMS) for a commercial HVAC system indicates a high differential pressure across the coil of a rooftop unit's air handler. The outdoor air damper is functioning correctly. What is the most probable cause?
Answer options:
- An overcharged refrigerant system ✅ A dirty or clogged air filter
- A failing compressor
- A miscalibrated thermostat
Correct answer: A dirty or clogged air filter
Explanation: A high differential pressure across a coil in an air handler indicates restricted airflow. The most common and easily rectifiable cause is a dirty or clogged air filter, which impedes air movement.
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- Which of the following refrigerants is a hydrofluorocarbon (HFC) and has a high ozone depletion potential (ODP
- Which component is responsible for compressing the refrigerant vapour to a high pressure and temperature?
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- What is the main operating characteristic difference between a fixed orifice (capillary tube) and a Thermostat
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