Refrigeration & Air Conditioning Mechanic Red Seal · Question
If a technician observes bubbles in the sight glass during normal operation of a refrigeration system, what is a likely cause?
Bubbles in the sight glass typically indicate a low refrigerant charge, as there's insufficient liquid to fill the line completely.
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Question: If a technician observes bubbles in the sight glass during normal operation of a refrigeration system, what is a likely cause?
Answer options: ✅ Low refrigerant charge
- Overcharge of refrigerant
- Clogged filter drier
- Excessive superheat
Correct answer: Low refrigerant charge
Explanation: Bubbles in the sight glass typically indicate a low refrigerant charge, as there's insufficient liquid to fill the line completely.
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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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