Refrigeration & Air Conditioning Mechanic Red Seal · Question
A hot-gas bypass valve is typically installed on a refrigeration system to:
Hot-gas bypass valves inject hot refrigerant gas directly into the evaporator inlet or outlet during low load conditions to artificiially increase the evaporato
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Question: A hot-gas bypass valve is typically installed on a refrigeration system to:
Answer options:
- Reduce head pressure during cold ambient conditions. ✅ Maintain minimum evaporator pressure during low load conditions to prevent coil icing.
- Bypass the condenser during start-up to speed up system equalization.
- Increase discharge temperature to improve oil return to the compressor.
Correct answer: Maintain minimum evaporator pressure during low load conditions to prevent coil icing.
Explanation: Hot-gas bypass valves inject hot refrigerant gas directly into the evaporator inlet or outlet during low load conditions to artificiially increase the evaporator pressure and temperature, preventing the coil from going too cold and icing up at its surface.
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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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