Part 56 Description - 4100 Series

The supply air blower limit switch is located at the top of the supply air blower assembly near the core blower limit switch and the discharge air sensor. It monitors the discharge air temperature and interrupts power to both the supply air blower and the core blower(s) if the discharge air temperature exceeds 190 degrees Fahrenheit. This sensor is a manual reset limit switch; therefore, will not reset until the reset button located on the face of the switch is pressed.