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whereas the 3098-156 uses a low-mass element for faster response (30-45s)
Increasing the pressure ensures water reaches the highest radiation points in multi-story structures
it is engineered to automatically open the electrical circuit when internal plenum temperatures reach 180°F
always verify the pressure differential using a digital manometer at the collector hood and transition box ports before condemning the switch
Weil McLain 511-624-643 Sensor Assembly R-410A whereas the 3098-156 uses aThe Weil McLain 511 624 643 Pressure Sensor Assembly is a critical OEM replacement component designed for high performance hydronic systems. This burner pressure sensor kit includes the transducer and junction box, providing the precise feedback necessary for modulating boiler control and combustion safety. Unlike standard switches, this assembly integrates a no siphon sensor design to deliver accurate static and dynamic pressure differential readings