Refrigeration & Air Conditioning Mechanic Red Seal · Question
An EPR (Evaporator Pressure Regulator) valve is used in a multi-evaporator system to:
An EPR valve is designed to maintain a stable, higher-than-suction-line evaporator pressure, ensuring the desired temperature is maintained in a specific refrig
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Question: An EPR (Evaporator Pressure Regulator) valve is used in a multi-evaporator system to:
Answer options:
- Control the superheat of the refrigerant leaving the evaporator regardless of load. ✅ Maintain a constant evaporator pressure above a set point, independent of compressor suction pressure.
- Reduce the flow of liquid refrigerant into the evaporator at low load conditions.
- Increase the pressure of the refrigerant entering the compressor during peak load.
Correct answer: Maintain a constant evaporator pressure above a set point, independent of compressor suction pressure.
Explanation: An EPR valve is designed to maintain a stable, higher-than-suction-line evaporator pressure, ensuring the desired temperature is maintained in a specific refrigerated space, preventing it from going too cold when connected to a common suction line or a compressor operating at a lower 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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