Refrigeration & Air Conditioning Mechanic Red Seal · Question
A technician observes a frosted suction line extending all the way back to the compressor's crankcase. What is the most likely cause?
Excessive refrigerant or insufficient heat transfer across the evaporator can cause liquid refrigerant to return to the compressor, leading to frost.
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Question: A technician observes a frosted suction line extending all the way back to the compressor's crankcase. What is the most likely cause?
Answer options: ✅ Overcharge of refrigerant or restricted airflow over evaporator
- Undercharge of refrigerant
- Dirty condenser coil
- Faulty expansion valve sensing bulb
Correct answer: Overcharge of refrigerant or restricted airflow over evaporator
Explanation: Excessive refrigerant or insufficient heat transfer across the evaporator can cause liquid refrigerant to return to the compressor, leading to frost.
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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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