Zone Air Pressure Transducer

¼” male connection, 4-20mA output, scaled 0-100.4 inH2O.

Brown 24V+, White 4-20mA, Blue -COM

This is an air pressure sensor that is used to close the loop on the burner power control. It reports back the actual air pressure and is used to linearize the output from the combustion air valve.  

NOTE. If this unit fails, by logging into the zone control page, you can select Feedback Off. This will allow operation of the zone control until the pressure transducer can be changed out. This unit is very reliable.

Installed in the main air manifold or vertical drop. 1 per zone. This is not a critical component but it is desirable for accurate control of the temperatures.

https://www.ifm.com/mounting/11420489UK.pdf