Refrigeration & Air Conditioning Mechanic Red Seal · Question
During a routine inspection of a commercial walk-in cooler using R-404A, a technician observes oil streaks on the outside of a brazed joint near the evaporator coil. What is the most appropriate next step for the technician?
Oil streaks typically indicate a refrigerant leak as the oil circulates with the refrigerant and can escape at leak points. An electronic leak detector is the m
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Question: During a routine inspection of a commercial walk-in cooler using R-404A, a technician observes oil streaks on the outside of a brazed joint near the evaporator coil. What is the most appropriate next step for the technician?
Answer options:
- Immediately add more refrigerant to compensate for the suspected loss.
- Clean the area and apply a soap bubble solution to confirm the leak. ✅ Use an electronic leak detector around the joint to pinpoint the exact location of the leak.
- Shut down the system and replace the entire evaporator coil.
Correct answer: Use an electronic leak detector around the joint to pinpoint the exact location of the leak.
Explanation: Oil streaks typically indicate a refrigerant leak as the oil circulates with the refrigerant and can escape at leak points. An electronic leak detector is the most effective tool to precisely pinpoint the leak, which is necessary before repair. Adding refrigerant or replacing the coil is premature.
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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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