Lochinvar & A.O. Smith 100113143 Switch 322838-754 When configured as an outdoor

When configured as an outdoor temperature sensor

this F135-30F fan control ensures the fan engages when the plenum reaches 135°F and terminates operation once it cools to 105°F (30°F differential)

Designed with 1-3/8 inch ODF suction and 7/8 inch ODF discharge brazed connections

1-3/16") in diameter by 5 inches in total length

Direct Field Replacement: Equipped with a standard 1/4-inch quick-connect terminal and single-hole mounting for rapid installation during service calls

Lochinvar & A.O. Smith 100113143 Switch 322838-754 When configured as an outdoorThe Lochinvar & A. O. Smith 100113143 Blocked Inlet Switch is a critical safety component designed for high efficiency commercial water heaters and boilers, including the Cyclone BTH and State SUF series. This genuine OEM replacement part acts as a normally closed (NC) pressure sensor calibrated to 2. 5" WC. Its primary function is to monitor the integrity of the air intake system, ensuring the combustion blower receives adequate airflow for safe