Johnson Controls A19ADB-2 Temperature Control 30067439-890 Installing this high-voltage relay board

Installing this high-voltage relay board restores logic-level communication between the thermostat and the mechanical components

Adjusting for LP is not recommended

It maintains the same physical footprint and rotational direction for a drop-in fit

000 PSI and features a significant 12

this 1-inch bore bearing protects the motor shaft from premature wear and heat buildup

Johnson Controls A19ADB-2 Temperature Control 30067439-890 Installing this high-voltage relay boardThe Johnson Controls A19ADB 2 is a heavy duty hot water immersion temperature control engineered for precision high limit cutout in commercial and industrial boiler systems. This mechanical thermostat features a single pole, single throw (SPST) switch configuration designed to open on temperature rise, providing a critical safety lockout when temperatures exceed the defined setpoint. With a robust 100 to 240 degree F setpoint range, it is the standard