Refrigeration & Air Conditioning Mechanic Red Seal · Question
A technician observes bubbling in the liquid line sight glass. What is a likely cause?
Bubbling in the liquid line sight glass typically indicates a lack of solid liquid flow. This is commonly caused by an undercharge of refrigerant, a restriction
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Question: A technician observes bubbling in the liquid line sight glass. What is a likely cause?
Answer options:
- System overcharge
- Low superheat ✅ Refrigerant undercharge or restriction in the liquid line
- Dirty condenser coils
Correct answer: Refrigerant undercharge or restriction in the liquid line
Explanation: Bubbling in the liquid line sight glass typically indicates a lack of solid liquid flow. This is commonly caused by an undercharge of refrigerant, a restriction in the liquid line, or excessive pressure drop across a filter dryer, leading to flash gas formation.
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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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