Refrigeration & Air Conditioning Mechanic Red Seal · Question
A commercial building's rooftop packaged unit is frequently tripping its high-pressure safety switch. Upon inspection, the technician finds the condenser coil heavily soiled with debris. What is the most probable direct consequence of this condition?
A soiled condenser coil restricts airflow across its surface, reducing heat rejection from the refrigerant. This leads to an increase in condensing temperature
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Question: A commercial building's rooftop packaged unit is frequently tripping its high-pressure safety switch. Upon inspection, the technician finds the condenser coil heavily soiled with debris. What is the most probable direct consequence of this condition?
Answer options:
- Reduced evaporator coil temperature
- Decreased compressor discharge pressure ✅ Elevated condensing temperature and pressure
- Increased refrigerant flow rate
Correct answer: Elevated condensing temperature and pressure
Explanation: A soiled condenser coil restricts airflow across its surface, reducing heat rejection from the refrigerant. This leads to an increase in condensing temperature and pressure, which can cause the high-pressure safety switch to trip.
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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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