Refrigeration & Air Conditioning Mechanic Red Seal · Question
A large industrial chiller's condenser is equipped with a three-way modulating hot gas bypass valve. What is the primary purpose of this valve?
A hot gas bypass valve used in the condenser circuit modulates discharge gas around a portion of or the entire condenser. This artificially elevates the condens
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Question: A large industrial chiller's condenser is equipped with a three-way modulating hot gas bypass valve. What is the primary purpose of this valve?
Answer options:
- To maintain minimum compressor suction pressure during low load conditions
- To regulate oil return to the compressor from the condenser
- To provide supplementary defrosting for the evaporator coil ✅ To control head pressure by bypassing discharge gas around the condenser
Correct answer: To control head pressure by bypassing discharge gas around the condenser
Explanation: A hot gas bypass valve used in the condenser circuit modulates discharge gas around a portion of or the entire condenser. This artificially elevates the condensing pressure, maintaining stable head pressure and ensuring proper expansion valve operation, especially in low ambient conditions.
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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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