Author Question: What happens first when there is a call-for-heat signal to a furnace equipped with a motor-driven ... (Read 65 times)

amal · **on:** Jul 24, 2018

What happens first when there is a call-for-heat signal to a furnace equipped with a motor-driven vent
damper?

a. The burners light to warm a bi-metal element.
b. A switch in the damper closes to start the burner.
c. A motor opens the vent damper.
d. The burners light to start the motor.

Question 2

The National Fuel Gas Code category of vent system used with a natural draft furnace is _____.

a. Category I
b. Category II
c. Category III
d. Category IV