Question

Thermostats are not perfect. The temperature must fall slightly below the setpoint to activate a system that turns on the furnace. The system often overshoots the setpoint after the furnace turns on. Which graph best represents the temperature readings for a thermostat set to 70 degrees F? А B 80° F 80° F Amm 70°F 70° F 60° F 60° F С D 80°F 80° F 70°F 70° F 60° F 60° F HMX Copyright The President and Fellows of Harvard College Graph A- the temperature remains constant. Graph B - the temperature fluctuates above and below the setpoint. Graph C- the temperature rises above the setpoint, then drops back to the setpoint. O Graph D - the temperature falls to the setpoint, then rises above the setpoint.

Answer 1

Graph B is correct as the temperature initially is slightly below the set point and triggers the furnace, followed by which there is an overshoot above the set point, then it comes back down again.So there is a slight fluctuation above and below the set point.