As an HVAC pro

22 and NSF 61G for both mechanical and potable water applications

0917 gas orifice prevents common combustion issues such as delayed ignition or excessive flame height

SPNO Configuration: Reliable Close On Fall operation designed for specific York and Coleman sequences

Restricted airflow is the primary culprit

Weil McLain 511-842-370 Transformer As an HVAC proThe Weil McLain 511 842 370 Transformer is a critical OEM replacement part engineered for high performance voltage regulation in residential and commercial boilers. As a step down control transformer, this component is designed to convert 120V primary voltage to a stable 24V secondary output, providing the necessary 40VA power rating to drive ignition modules, gas valves, and integrated boiler control systems. This HVAC control transformer is a direct