Refrigeration & Air Conditioning Mechanic Red Seal · Question
A technician observes frost accumulating only on the first few passes of an evaporator coil. Which of the following is the most likely cause?
Insufficient refrigerant (undercharge) leads to a lower evaporating temperature and pressure, causing only a portion of thecoil to be cold enough to absorb heat
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Question: A technician observes frost accumulating only on the first few passes of an evaporator coil. Which of the following is the most likely cause?
Answer options:
- Overcharge of refrigerant ✅ Undercharge of refrigerant
- Restricted air flow over the coil
- Non-condensable gases in the system
Correct answer: Undercharge of refrigerant
Explanation: Insufficient refrigerant (undercharge) leads to a lower evaporating temperature and pressure, causing only a portion of thecoil to be cold enough to absorb heat and 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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