A fan relay (FR) circuit is designed so that a switch can be used to turn the circuit completely off, operate the fan manually, or ____.
A) operate the fan by remote control
B) permit the fan to be operated by a thermostat
C) turn on a warning light
D) automatically reset the fan

Question

Quizplus · Accepted Answer

The fan relay circuit is usually used in HVAC systems to control the operation of a fan through a thermostat. Therefore, the best choice is B, which permits the fan to be operated by the thermostat. The other options, such as remote control or warning lights, may be useful in different scenarios but are not specifically related to the fan relay circuit. Option D, automatically resetting the fan, may not be desirable, as it may cause the fan to operate when it is not needed.

A Fan Relay (FR) Circuit Is Designed So That a Switch