this unit maintains performance across a wide ambient temperature range of -30 to 50°C (-22 to 122°F) and up to 95% RH non-condensing humidity

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

the orifice may be obstructed or improperly sized

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

ensuring exact mounting hole alignment and terminal spacing

Johnson Controls A70KA-1 Control Els PW 29614 this unit maintains performance acrossThe 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