Johnson Controls WT-4002-MFM Pneumatic Two-Pipe Programmable Thermostat

The Johnson Controls WT-4002-MFM is a DA/RA 2-pipe Pneumatic Programmable Thermostat developed to regulate heating or cooling systems. This pneumatic proportional controller takes a current input of between 4-20mA and produces an output of between 3 and 15 PSI to control heating and cooling appropriately. This equipment is designed mainly for 2-pipe AHU systems where it regulates the 2 blend air conditions by converting the input signal to output pressure which in turn controls the pneumatic actuators, dampers, and valves in the heating and cooling systems.