Refrigeration & Air Conditioning Mechanic Red Seal · Question
A service technician is commissioning a new walk-in cooler. The hot gas bypass valve is chattering during low load conditions. What is the most likely cause?
Chattering in a hot gas bypass valve often indicates unstable operation due to issues like an incorrect pressure signal to the valve diaphragm, which can be cau
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Question: A service technician is commissioning a new walk-in cooler. The hot gas bypass valve is chattering during low load conditions. What is the most likely cause?
Answer options:
- The bypass valve is incorrectly sized and is too large for the application.
- Insufficient head pressure causing unstable gas flow to the valve. ✅ The valve's external equalizer line is clogged or restricted.
- Incorrect superheat setting on the thermostatic expansion valve.
Correct answer: The valve's external equalizer line is clogged or restricted.
Explanation: Chattering in a hot gas bypass valve often indicates unstable operation due to issues like an incorrect pressure signal to the valve diaphragm, which can be caused by a clogged or restricted external equalizer line reacting to fluctuating evaporator 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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