This is an auto-reset pressure control

using the specific York S1-024-25184-000 ensures the pick-up and drop-out voltages match the OEM motor's CEMF perfectly

This unit features a 3/4" NPT inlet and outlet

It features a high-performance 24V VAC coil with an 11 Ohms DC resistance

Is the Zonefirst TTS compatible with third-party zone boards

Weil McLain 511-044-505 Gas Valve Els PW 29614 This is an auto-reset pressureThe Weil McLain 511 044 505 gas valve is a critical service component engineered for high efficiency hydronic systems. This 24V redundant gas valve is factory set for natural gas applications with a 3. 5" WC manifold pressure, ensuring precise fuel regulation for consistent combustion. Built for durability in commercial and residential settings, it features a 3 4" x 1" NPT connection, making it a direct replacement for specific boiler configurations.