Lochinvar & A.O. Smith 100170640 Thermostat Control 318973-401 For mid-efficiency split systems and

For mid-efficiency split systems and packaged gas units

Universal Mounting: Can be installed in any position (except upside down) to accommodate various HVAC gas valve wiring configurations

maintaining original equipment performance and refrigerant flow specs

While often utilized in liquid and steam systems

What is the difference between the 3B1B and the older 3B1A

Lochinvar & A.O. Smith 100170640 Thermostat Control 318973-401 For mid-efficiency split systems andAs a veteran tech, you know that maintaining thermal safety is non negotiable for commercial boiler and water heater uptime. The Lochinvar & A. O. Smith 100170640 Thermostat Control is a critical high limit thermostat engineered to provide precise over temperature protection in Lochinvar boilers and high recovery water heating systems. This genuine OEM temperature limit switch serves as a direct replacement for the obsolete Lochinvar TST30009,