Resideo L4029E1227 Fixed Limit Controller 125°F 3" Insertion

The Resideo L4029E1227 Limit Controller is a safety control device that is used in the protection of HVAC equipment such as water heaters and boilers against overheating. It is used as a temperature sentinel, which measures the air temperature in the system. How It Works: It is a bimetallic sensor device installed in the airflow path and the controller constantly monitors the temperature. If the temperature goes higher than the set value of 125°F, the circuit controlling the device is switched off because the controller’s internal switch opens to avoid further harm or threat on the device. This manual reset procedure ensures that the system is offline until the cause of the overheating is corrected and basic design makes installation easy.