Johnson Controls A-4000-138 Station 30067439-890 This specific model supports both

This specific model supports both floating control and two-position control

Optimized Performance: Enhances system longevity by preventing the unnecessary mechanical stress of timed defrost cycles in dry or mild conditions

Built for seamless integration into Daikin and McQuay packaged rooftop units

For technicians managing high-demand service calls

or a "no heat" call where the 24V gas valve solenoid is energized but fails to open the internal port

Johnson Controls A-4000-138 Station 30067439-890 This specific model supports bothThe Johnson Controls A 4000 138 is a professional grade remote mounted pressure reducing station engineered to maintain precise pneumatic control system performance. This unit effectively regulates output pressure within a tight 0. 02 psi tolerance, even when managing input pressure variations of up to 20 psi. Designed for rigorous HVACR environments, it handles a maximum input pressure limit of 300 psig and provides a reliable air flow capacity of 25