Refrigeration & Air Conditioning Mechanic Red Seal · Question
A cold room evaporator coil is heavily iced, even though the defrost cycle appears to be functioning. What component failure is most likely contributing to this condition?
If the evaporator is heavily iced despite a functioning defrost cycle initiating, it indicates the heat applied during defrost is insufficient. A defective defr
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Question: A cold room evaporator coil is heavily iced, even though the defrost cycle appears to be functioning. What component failure is most likely contributing to this condition?
Answer options:
- Faulty compressor contactor
- Clogged condenser coil ✅ Defective defrost heater element
- Overcharged refrigerant system
Correct answer: Defective defrost heater element
Explanation: If the evaporator is heavily iced despite a functioning defrost cycle initiating, it indicates the heat applied during defrost is insufficient. A defective defrost heater element is a common cause for this issue.
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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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