Refrigeration & Air Conditioning Mechanic Red Seal · Question
In a refrigeration system with a vertical suction riser, what is the purpose of installing a P-trap at the bottom of the riser?
A P-trap at the bottom of a vertical suction riser is designed to collect compressor oil and ensure it is carried up the riser by the velocity of the refrigeran
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Question: In a refrigeration system with a vertical suction riser, what is the purpose of installing a P-trap at the bottom of the riser?
Answer options:
- To collect and return refrigerant liquid to the compressor ✅ To prevent lubricant from draining back into the evaporator during off-cycles
- To reduce noise transmission from the compressor
- To isolate the compressor from evaporator vibrations
Correct answer: To prevent lubricant from draining back into the evaporator during off-cycles
Explanation: A P-trap at the bottom of a vertical suction riser is designed to collect compressor oil and ensure it is carried up the riser by the velocity of the refrigerant gas flow, preventing oil from draining back into the evaporator coil during off-cycles and potentially causing oil logging, which impairs heat transfer.
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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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