because it utilizes SPDT switching

The mechanical specifications and 1/4" compression fittings remain identical for drop-in physical replacement

Common Questions Is the B1940000 compatible with 115V systems

What is the difference between this and the "BGB" model

the 100109978 is the current manufacturer-recommended replacement for the legacy part number 9004606205

Resideo M847D-ZONE Replacement motor 321702-401 because it utilizes SPDT switchingThe Resideo M847D ZONE replacement motor is a purpose built 24Vac spring return actuator engineered for direct compatibility with ARD and ZD zone dampers. This two position damper motor provides reliable air flow control in residential and commercial zoning systems. Designed as a direct replacement for M847D1004, the unit features a power closed, spring open configuration, ensuring the damper default position is open during power loss for system