Refrigeration & Air Conditioning Mechanic Red Seal · Question
A building operator reports that their rooftop unit's (RTU) supply fan is drawing excessive current and producing significantly reduced airflow, despite the fan physically running. When troubleshooting, a refrigeration mechanic suspects a static pressure issue. What instrument would be most appropriate to confirm this suspicion?
A U-tube manometer or digital differential pressure gauge is used to measure static pressure across components like coils, filters, or across the fan itself. Hi
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Question: A building operator reports that their rooftop unit's (RTU) supply fan is drawing excessive current and producing significantly reduced airflow, despite the fan physically running. When troubleshooting, a refrigeration mechanic suspects a static pressure issue. What instrument would be most appropriate to confirm this suspicion?
Answer options:
- Thermocouple psychrometer
- Clamp-on ammeter ✅ U-tube manometer or digital differential pressure gauge
- Anemometer with a hot-wire probe
Correct answer: U-tube manometer or digital differential pressure gauge
Explanation: A U-tube manometer or digital differential pressure gauge is used to measure static pressure across components like coils, filters, or across the fan itself. High static pressure indicates excessive resistance to airflow, which would cause reduced airflow and increased fan motor load.
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Question explanations
- 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?
- According to the Canadian Electrical Code (CEC), what is the minimum required working clearance in front of el
- What is the main operating characteristic difference between a fixed orifice (capillary tube) and a Thermostat
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