Three-speed PSC (Permanent Split Capacitor) circulator output, two-speed inducer output, two-stage gas valve outputFurnace status LED - tri-color (green, red and amber)Pushbutton fault history retrievalHeat fan off delay (dipswitch selectable), fan on delay for cooling, and auto second-stage delayIncludes 21D64-2 Silicon Nitride ignitor kit and module
The White-Rodgers 21M51U-843 universal integrated furnace control kit is a two-stage hot surface ignition control kit for three-speed systems (PSC Blower Motor). The kit includes 21D64-2 Silicon Nitride ignitor kit and module. Replaces White-Rodgers 50M51-242 and all 50M61-xxx's two-stage HSI systems with 80V or 120V Ignitors.
Brand: Emerson Thermostats, Model: 21M51U-843, Color: 9.75