HVAC Excellence Master Combustion Practice Questions - HVAC Excellence Master Specialist - Electric & Gas Heat Combustion Analysis (Written Examination) Exam

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A combustion analyzer shows oxygen rising and carbon dioxide falling in the flue gas as a technician opens the primary air shutter. This relationship occurs because:

Excess air dilutes the flue gas, lowering CO2 as O2 increases The fuel valve is leaking gas into the flue The heat exchanger is cracked The analyzer oxygen cell has failed

Correct Answer:

Excess air dilutes the flue gas, lowering CO2 as O2 increases

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