To prove that the combustion blower motor is operating before ignition, a ____ would be used.
A) toggle switch
B) pressure differential switch
C) push button switch
D) sail switch

Question

Quizplus · Accepted Answer

A sail switch would be used to detect the air flow caused by the combustion blower motor to ensure that it is operating before ignition. The switch is activated by the air flow, which moves a small sail or paddle. If the sail or paddle does not move, then the switch will not close and the ignition sequence will not continue, ensuring that there is no risk of fuel being introduced into the combustion chamber without proper air flow.

To Prove That the Combustion Blower Motor Is Operating Before