Johnson Controls A-4000-138 Station

The 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 scfm. The station arrives fully assembled with 3/8-inch O.D. compression elbow fittings, an integrated wall mounting bracket, and a clear 0-30 psi gauge for real-time monitoring. For added system safety, the A-4000-138 features a factory-installed pressure relief valve set at 25 psig, which can be adjusted if your specific application requires a different threshold. This industrial air regulator is the standard choice for contractors requiring stable pressure reduction in remote pneumatic loops that demand high-capacity throughput and consistent setpoint accuracy.

• Precision Regulation: Maintains a 0.02 psi output stability for sensitive pneumatic controls.
• High Input Tolerance: Safely manages compressed air supplies up to 300 psig.
• Rapid Installation: Shipped as a complete pressure reducing valve assembly with bracket and gauge included.
• Safety Integrated: Features an adjustable safety relief valve factory-calibrated to 25 psig.
• Standard Fitment: Utilizes 3/8" O.D. compression fittings for seamless integration into existing lines.

Can the output range be increased beyond 30 psi?
Yes, the internal regulator can be adjusted up to 50 psig; however, you must replace the standard 0-30 psi gauge with a higher-range unit and readjust the safety relief valve to account for the increased pressure.

Is this station suitable for high-flow pneumatic applications?
The unit is rated for an air flow capacity of 25 scfm, making it suitable for larger pneumatic networks and remote branch lines requiring substantial volume.

What are the specific connection requirements for the A-4000-138?
This station uses 3/8-inch O.D. compression elbow fittings on both the high and low-pressure sides to ensure a leak-free seal in HVAC pneumatic systems.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.