Carrier HH18HA285 Auto Limit Switch 65°F-85°F

The Carrier HH18HA285 is an automatic limit switch an essential safety device in Carrier HVAC systems. It is a temperature control device with an in-built on/off switch. Sited inside the air handling unit, it measures air temperature. If the air temperature goes beyond the set point, usually between 65°F and 85°F, the switch initiates a shut-off. This protection prevents the furnace or other elements of the system burn out because the temperature has reached levels that were not designed for. After the air temperature goes below the set point, the limit switch resets and the system continues to run again.