White-Rodgers Universal Integrated Furnace Control 2-Stage, 21V51U-843

Product description

• Variable speed circulator output for ECM (Electronically Commutated Motor)
• Dipswitch selectable for OEM applications two-speed inducer output, two-stage gas valve output
• Pushbutton fault history retrieval
• Heat fan off delay (dipswitch selectable), fan on delay for cooling, and auto second-stage delay
• Includes 21D64-2 Silicon Nitride ignitor kit, module and wiring harness