Johnson Controls A19AAA-40 Temperature Control 30067439-890 or visible carbon scorching on

or visible carbon scorching on the relay terminals

allowing technicians and facility managers to identify which specific detector has entered an alarm state when the detector itself is not easily visible

ensuring seamless integration with existing control boards

and extension tubing to reduce time on the job site

Johnson Controls A19AAA-40 Temperature Control 30067439-890 or visible carbon scorching onThe Johnson Controls A19AAA 40 is a heavy duty, single stage remote bulb thermostat designed for precision temperature regulation in demanding HVACR environments. Engineered with a liquid filled sensing element, this control provides consistent "repeat" accuracy that remains unaffected by barometric pressure or cross ambient temperature fluctuations. This specific model features a temperature range of 20? F to 80? F (? 5? C to 28? C), making it an