Johnson Controls A-4000-138 Station 30067439-890 the Field Controls 46491600 with

the Field Controls 46491600 with the plastic base (GMA-PL) is the current standard replacement for older GVD models

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

For technicians managing high-demand service calls

Precise Differentials: Maintains a 3 1/2 degree differential for each stage with a 3 degree fixed inter-stage differential for stable ambient temperature control

Reliable Coil Operation: Standard 24V control circuit compatibility ensures seamless integration with most low-voltage thermostats and control boards

Johnson Controls A-4000-138 Station 30067439-890 the Field Controls 46491600 withThe 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