Refrigeration & Air Conditioning Mechanic Red Seal · Question
A supermarket has a common suction header for three display cases: a dairy case (0°C), a produce case (4°C), and a meat case (-2°C). Which valve type is essential for managing the distinct temperatures for each case efficiently while using a single compressor?
EPR valves are crucial in multi-evaporator systems with a common suction header. They maintain the desired higher evaporator pressure (and thus temperature) in
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Question: A supermarket has a common suction header for three display cases: a dairy case (0°C), a produce case (4°C), and a meat case (-2°C). Which valve type is essential for managing the distinct temperatures for each case efficiently while using a single compressor?
Answer options:
- Thermostatic Expansion Valve (TXV)
- Automatic Expansion Valve (AXV) ✅ Evaporator Pressure Regulator (EPR) Valve
- Suction Accumulator
Correct answer: Evaporator Pressure Regulator (EPR) Valve
Explanation: EPR valves are crucial in multi-evaporator systems with a common suction header. They maintain the desired higher evaporator pressure (and thus temperature) in individual cases, preventing the colder evaporators from pulling down the pressure and temperature of the warmer ones.
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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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