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the R07489B003 is the current technical designation for this specific sequence relay used in Armstrong and Allied Air furnace models
Vent Limiting Technology: The factory-installed integral vent limiter ensures safe operation by restricting gas escapement in the event of diaphragm rupture
providing robust HVAC relay performance
While specifically designed for the Q624 and Q652 series
This genuine OEM replacement part is specifically designed for Modine PD400 and BD400 unit heaters
Lennox 36N77 Hot Surface Ignitor the R07489B003 is the currentThe Lennox 36N77 Hot Surface Ignitor is a critical OEM replacement part designed for high performance gas fired combustion systems. Also identified by the identical part number 36N7701, this nitride ignitor is engineered to withstand extreme thermal cycling within residential furnaces and boilers. As a direct fit HSI, it ensures precise gas ignition by delivering a robust heat source that interfaces seamlessly with the furnace's integrated control
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