Refrigeration & Air Conditioning Mechanic Red Seal · Question
A walk-in freezer uses a hot gas defrost cycle. During defrost, the compressor continues to operate. Which of the following is true regarding refrigerant flow?
In a hot gas defrost system, a solenoid valve redirects high-pressure, high-temperature discharge gas from the compressor discharge line, bypassing the condense
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Question: A walk-in freezer uses a hot gas defrost cycle. During defrost, the compressor continues to operate. Which of the following is true regarding refrigerant flow?
Answer options: ✅ Hot discharge gas bypasses the condenser and flows directly to the evaporator.
- Hot discharge gas bypasses the expansion valve and flows directly to the evaporator.
- Hot discharge gas flows through the condenser, then bypasses the expansion valve to the evaporator.
- Hot discharge gas flows through the liquid line solenoid to the evaporator.
Correct answer: Hot discharge gas bypasses the condenser and flows directly to the evaporator.
Explanation: In a hot gas defrost system, a solenoid valve redirects high-pressure, high-temperature discharge gas from the compressor discharge line, bypassing the condenser and liquid line, directly into the evaporator inlet, providing heat to melt frost.
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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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