Refrigeration & Air Conditioning Mechanic Red Seal · Question
In a commercial refrigeration system, what is the purpose of an EPR (Evaporator Pressure Regulator) valve?
An EPR valve is used in multi-evaporator systems or applications where a precise evaporator temperature is critical. It maintains a constant minimum pressure in
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Question: In a commercial refrigeration system, what is the purpose of an EPR (Evaporator Pressure Regulator) valve?
Answer options:
- To maintain a constant head pressure
- To relieve excessively high evaporator pressure ✅ To maintain a desired minimum pressure (and thus temperature) in the evaporator, regardless of compressor suction pressure
- To prevent liquid refrigerant from entering the compressor
Correct answer: To maintain a desired minimum pressure (and thus temperature) in the evaporator, regardless of compressor suction pressure
Explanation: An EPR valve is used in multi-evaporator systems or applications where a precise evaporator temperature is critical. It maintains a constant minimum pressure in its connected evaporator, preventing it from dropping below the set point even if other evaporators demand colder temperatures and lower suction pressure.
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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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