49. what would likely be the result of an oversized mid - efficiency furnace? a. the flue gas would back up…

49. what would likely be the result of an oversized mid - efficiency furnace? a. the flue gas would back up in the draft diverter. b. the furnace would operate at a low temperature split. c. the heat exchanger would corrode. d. the supply gas pressure would drop when furnace is in operation

49. what would likely be the result of an oversized mid - efficiency furnace? a. the flue gas would back up in the draft diverter. b. the furnace would operate at a low temperature split. c. the heat exchanger would corrode. d. the supply gas pressure would drop when furnace is in operation

Answer

Brief Explanations:

An oversized mid - efficiency furnace will short - cycle frequently. This short - cycling causes the heat exchanger to cool down and heat up rapidly, leading to condensation of acidic flue gases on the heat exchanger surface. The acidic condensate causes corrosion of the heat exchanger.

Answer:

C. The heat exchanger would corrode.