Johnson Controls A19AAF-12 Temperature Control 30067439-890 and EV251B valve series

and EV251B valve series

making it suitable for large-scale residential and light commercial hydronic applications

For HVAC technicians performing commercial HVAC maintenance

Technical Benefits Precise 0

Johnson Controls A19AAF-12 Temperature Control 30067439-890 and EV251B valve seriesThe Johnson Controls A19AAF 12 is a robust mechanical temperature control engineered for high performance heating and general purpose HVACR applications. Built with a single pole double throw (SPDT) switch configuration, this remote bulb controller delivers precise temperature regulation across a broad 25 to 225? F setpoint range. The unit features an automatic reset mechanism and a 3. 5? F fixed differential, ensuring consistent cycling and system