The new board essentially combined the best qualities of two previously released boards, the 50M56U-843 (single-stage HSI integrated furnace control for PSC motors) and the 50X57-843 (single-stage HSI integrated furnace control for X13 motors). It can replace furnace controls for systems with PSC or X13 motors (550+ cross-references) without all the harnesses; the control can configure everything that is plugged into it without you worrying about harnesses or DIP switches.
The 50M56X-843 also allows thermostat wires to plug into it directly and has test pins for flame sensing. It also has an LED display that shows exactly what is happening; it can alternate between showing the operating mode and the operating current, so you don’t need to use a meter to test your flame sensor. The LED display will also show the error code when the board detects a problem.
These boards work well with Emerson White-Rodgers Universal Premium Flame Sensor, which comes with a cross-reference chart you can use to bend or cut it to replace over 1000 OEM parts.
Like the Emerson White-Rodgers All-Spark, the 50M56X-843 also uses near-field communication (NFC) technology for quick and easy configuration through the WR Connect app on your smartphone. You don’t need an internet connection, cellular data, or power to the control to configure it with your smartphone. The app can also let you adjust the cool, heat, or fan settings on/off and offers a diagnostics tab.
Learn more about the 50M56X-843 at https://climate.emerson.com/en-us/sho….
Learn more about the HVACR Training Symposium at https://hvacrschool.com/symposium.
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