The Johnson Controls A-4000-139 is a single-stage pressure reducing valve station engineered for pneumatic control systems requiring high-purity air delivery

Integrating this genuine Amana HVAC part maintains the factory-specified pressure setpoints required for proper combustion air proving and total system reliability during heavy heating cycles

Rely on this heavy-duty steel fan blade for industrial ventilation and cooling applications where consistent airflow and durability in harsh environments are non-negotiable for professional contractors

Compact Form Factor: Fits into tight control cabinets where space is at a premium

Lennox 98M12 Piston 319852-301 The Johnson Controls A-4000-139 isThe Lennox 98M12 Piston is a precision engineered fixed orifice metering device designed for specific HVAC applications requiring an expansion orifice size of . 062. This refrigeration piston serves as a critical component in maintaining correct refrigerant mass flow across the evaporator coil, ensuring optimized heat transfer and system pressure balance. When performing a field replacement or matching a specific condensing unit and indoor coil