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80" WC Calibration: Ensures the boiler only fires when the venting system is operating at the correct efficiency and safety levels
terminals 4 and 6 are "dummy" terminals used for wire anchoring and have no electrical connection to the internal relay coil or contacts
pressure switch stuck open
ensuring long-term system integrity in demanding environments
Slant Fin 412-705-040 Damper Assembly 30067439-890 80" WC Calibration: Ensures theThe Slant Fin 412 705 040 is a heavy duty 5 inch automatic vent damper assembly engineered specifically for high efficiency hydronic heating systems. Designed as a direct replacement component, this motorized flue damper prevents standby heat loss by sealing the vent pipe when the burner is not firing, significantly improving the AFUE rating of the boiler. This assembly features a robust internal synchronous motor and built in safety interlock