Question

A technician performs a combustion efficiency test on an oil-fired furnace. He notices that the CO₂ percentage is high. What could cause this?

a. Not enough primary air
b. Not enough air in the fuel-air mixture.
c. Reduce primary air
d. It controls the draft through the system

Answer 1

Not enough primary air can cause a high percentage of CO₂ in a combustion efficiency test on an oil-fired furnace.

Step-by-step explanation:

A high percentage of CO₂ in a combustion efficiency test on an oil-fired furnace can be caused by a. not enough primary air. This means that there is not enough preheated air being blown into the furnace through the nozzles near the bottom of the furnace. Without enough air, the combustion process is incomplete, leading to a higher concentration of carbon dioxide (CO₂) in the flue gas.