Johnson Controls A-4000-138 Station 30067439-890 or a "no heat" call

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

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

the 47743's rugged construction ensures it maintains its structural integrity even in harsh operating environments

Built for seamless integration into Daikin and McQuay packaged rooftop units

Johnson Controls A-4000-138 Station 30067439-890 or a "no heat" callThe 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