Refrigeration & Air Conditioning Mechanic Red Seal · Question
A maintenance technician is checking an R-134a refrigeration system and notices the sight glass is continuously bubbling. After ruling out an expansion valve issue, what is the most likely cause and corresponding action?
Continuous bubbling in the sight glass typically indicates that there is insufficient liquid refrigerant in the liquid line, often due to a low refrigerant char
Start free practice for Refrigeration & Air Conditioning Mechanic Red Seal
500 questions · no signup required · 40 free questions per day
Question: A maintenance technician is checking an R-134a refrigeration system and notices the sight glass is continuously bubbling. After ruling out an expansion valve issue, what is the most likely cause and corresponding action?
Answer options: ✅ A low refrigerant charge; add more refrigerant to the system.
- An overcharged system; recover some refrigerant.
- A clogged filter drier; replace the filter drier.
- Non-condensable gases in the system; purqe the non-condensables.
Correct answer: A low refrigerant charge; add more refrigerant to the system.
Explanation: Continuous bubbling in the sight glass typically indicates that there is insufficient liquid refrigerant in the liquid line, often due to a low refrigerant charge. Adding refrigerant will fill the line and eliminate the bubbles, assuming other components are functioning correctly.
Start free practice for Refrigeration & Air Conditioning Mechanic Red Seal
500 questions · no signup required · 40 free questions per day
More about Refrigeration & Air Conditioning Mechanic Red Seal
Related Questions
- 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
- Which type of electric motor requires a capacitor for starting and running, offering higher efficiency and bet
- When evacuating a refrigeration system, what is the recommended deep vacuum level, typically measured in micro
More for Refrigeration & Air Conditioning Mechanic Red Seal candidates
FAQs
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
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Refrigeration & Air Conditioning Mechanic Red Seal Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.