Refrigeration & Air Conditioning Mechanic Red Seal · Question
Which of the following describes the most precise method to determine the combustion efficiency of a gas-fired warm air furnace?
Combustion efficiency is accurately determined by analyzing the components of the flue gas, specifically measuring the net stack temperature and either the oxyg
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Question: Which of the following describes the most precise method to determine the combustion efficiency of a gas-fired warm air furnace?
Answer options: ✅ Measuring the flue gas temperature and oxygen (O₂) or carbon dioxide (CO₂) concentration.
- Observing the flame characteristics and colour, and the presence of any soot.
- Comparing the gas input rating to the measured temperature rise across the heat exchanger.
- Checking the furnace filter cleanliness and adjusting the fan speed settings.
Correct answer: Measuring the flue gas temperature and oxygen (O₂) or carbon dioxide (CO₂) concentration.
Explanation: Combustion efficiency is accurately determined by analyzing the components of the flue gas, specifically measuring the net stack temperature and either the oxygen (O₂) or carbon dioxide (CO₂) levels.
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- 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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