Refrigeration & Air Conditioning Mechanic Red Seal · Question
A refrigeration system is experiencing high superheat at the compressor suction line and low suction pressure. The discharge pressure is normal, but the compressor is running continuously. Which of the following is the most likely cause?
A restricted liquid line filter-drier reduces refrigerant flow to the evaporator, resulting in low suction pressure and high superheat as the evaporator starves
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Question: A refrigeration system is experiencing high superheat at the compressor suction line and low suction pressure. The discharge pressure is normal, but the compressor is running continuously. Which of the following is the most likely cause?
Answer options:
- Overcharged refrigerant system ✅ Restricted liquid line filter-drier
- Condenser fan motor failure
- Failed compressor suction valve
Correct answer: Restricted liquid line filter-drier
Explanation: A restricted liquid line filter-drier reduces refrigerant flow to the evaporator, resulting in low suction pressure and high superheat as the evaporator starves. The compressor continues to run trying to meet the cooling demand.
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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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