How do I identify the correct Maxitrol spring for my regulator

ensuring exact mounting hole alignment and terminal spacing

5" WC (Water Column) to ensure optimal combustion efficiency in Sterling unit heaters and furnaces

Fail-Safe Operation: Automatic reset logic ensures heat restoration immediately after a water loss or power event is resolved

What is the purpose of the 12A39 vent limiter in this model

Johnson Controls A70KA-1 Control Els PW 29614 How do I identify theThe Johnson Controls A70KA 1 Control is a heavy duty, high limit temperature controller designed for critical HVACR safety applications. This remote bulb temperature control operates within a setpoint range of 100F to 170F, specifically engineered to open the main circuit upon a temperature rise. Featuring a 4 wire, 2 circuit contact block, the A70KA 1 (identical to the A70KA 1C) provides two isolated sets of contacts: as the main LINE M2 contacts