Refrigeration & Air Conditioning Mechanic Red Seal · Question
A technician is recovering R-134a from a small commercial refrigerator. The recovery machine has an indicator for liquid and vapour recovery. At what point should the technician switch from liquid to vapour recovery?
The most efficient recovery process involves initially recovering liquid refrigerant, as it removes the bulk of the charge quickly. Once the liquid flow subside
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Question: A technician is recovering R-134a from a small commercial refrigerator. The recovery machine has an indicator for liquid and vapour recovery. At what point should the technician switch from liquid to vapour recovery?
Answer options: ✅ When the liquid flow stops or significantly reduces, indicating most liquid has been removed.
- As soon as the recovery process begins to maximize speed.
- When the system pressure drops to atmospheric pressure.
- Only when the recovery cylinder is nearly full.
Correct answer: When the liquid flow stops or significantly reduces, indicating most liquid has been removed.
Explanation: The most efficient recovery process involves initially recovering liquid refrigerant, as it removes the bulk of the charge quickly. Once the liquid flow subsides, indicating minimal liquid remaining, switching to vapour recovery allows for the removal of any remaining refrigerant vapour to achieve the required vacuum levels.
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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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