Refrigeration & Air Conditioning Mechanic Red Seal · Question
A refrigeration mechanic is troubleshooting a residential forced-air system where the homeowner complains of insufficient heating in a back bedroom. After inspecting the existing ductwork, what common issue related to duct systems could be a primary cause of this problem?
Leaky return air ducts can draw in unconditioned air from unwanted spaces (like basements or attics), reducing the overall air volume and temperature supplied t
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Question: A refrigeration mechanic is troubleshooting a residential forced-air system where the homeowner complains of insufficient heating in a back bedroom. After inspecting the existing ductwork, what common issue related to duct systems could be a primary cause of this problem?
Answer options:
- Oversized supply duct to the bedroom outlet ✅ Leaky return air duct in the basement
- Insufficient BTUs from the furnace
- An incorrectly wired thermostat
Correct answer: Leaky return air duct in the basement
Explanation: Leaky return air ducts can draw in unconditioned air from unwanted spaces (like basements or attics), reducing the overall air volume and temperature supplied to conditioned zones, thus leading to insufficient heating in distant rooms.
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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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