and PWB Series boiler models for seamless field installation

What is the purpose of the 1/4" external equalizer

this black pneumatic control tubing ensures low smoke and heat release in the event of a fire

and Chandler equipment

Johnson Controls VG7241LT+71CAGA Valve Assembly R-410A and PWB Series boiler modelsThe Johnson Controls VG7241LT+71CAGA is a high performance 3 4 inch NPT globe valve assembly designed for precise modulation in demanding HVACR applications. This two way normally open valve features a robust cast bronze body and durable brass trim, engineered to regulate the flow of hot water, chilled water, or 50 50 glycol solutions. With a 7. 3 Cv rating and equal percentage flow characteristic, it ensures stable control and optimized system