Refrigeration & Air Conditioning Mechanic Red Seal · Question
A homeowner reports their residential air conditioning system is running continuously but not cooling effectively. The technician checks the refrigerant charge and finds it to be critically low. Which of the following is the most likely immediate cause for troubleshooting?
A critically low refrigerant charge is almost always indicative of a leak in the system, as refrigerant is not consumed during normal operation. The technician
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Question: A homeowner reports their residential air conditioning system is running continuously but not cooling effectively. The technician checks the refrigerant charge and finds it to be critically low. Which of the following is the most likely immediate cause for troubleshooting?
Answer options:
- A faulty expansion valve ✅ A refrigerant leak in the system
- An undersized evaporator coil
- A clogged condensate drain
Correct answer: A refrigerant leak in the system
Explanation: A critically low refrigerant charge is almost always indicative of a leak in the system, as refrigerant is not consumed during normal operation. The technician must locate and repair the leak before recharging the system.
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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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