Trane CNT1405 Auto Limit Switch 55°F-65°F

The Trane CNT1405 Auto Limit Switch is a small safety device that measures 2.6 inches across the base with a height of only 0.06 inches and is used in numerous HVAC devices to control temperature. It works sort of like a thermostat but within a much smaller range of temperature. The limit switch initiates a response in the HVAC system and opens or closes an electrical circuit should the temperature reach a certain set point. As for the case of Trane, it is a centralized system, and set point range ranges between 55°F and 65°F. If the temperature dips below 55°F the switch will open the circuit which means that the furnace could switch on and heat the space.