Resideo R24DB4005 Heat Sequencer 321894-709 the 510-312-015 comes as a

the 510-312-015 comes as a kit that includes the immersion well

This part is specifically cataloged as a Source 1 replacement for York equipment and is designed for use within specific Square D circuit breaker housings

Its vibration-resistant design maintains its mechanical integrity under high-cycle demand

This technical replacement replaces multiple legacy part numbers

enabling compatibility with various media including water

Resideo R24DB4005 Heat Sequencer 321894-709 the 510-312-015 comes as aThe Resideo R24DB4005 Heat Sequencer is a heavy duty, solid state solution designed for staged electric heat applications. Engineered for multi stage furnaces and air handlers, this sequencer utilizes Positive Temperature Coefficient (PTC) heaters to provide precise, reliable timing across four integrated switches. With a 24Vac input voltage, it manages high current loads with a 25 Amp resistive contact rating and a 14 Amp inductive rating at 120Vac,