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which is sometimes required depending on the specific boiler manifold configuration
Direct Field Replacement: Equipped with a standard 1/4-inch quick-connect terminal and single-hole mounting for rapid installation during service calls
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
making it a versatile addition to any service truck's inventory
Lochinvar & A.O. Smith 100113143 Switch 322838-754 which is sometimes required dependingThe 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