White-Rodgers 21M51U-843 Two-Stage HSI Integrated Furnace Control Board, 3 Speed (PSC)

White-Rodgers 21M51U-843 Universal Two-Stage HSI Integrated 3-Speed (PSC) Circulator Furnace Control Kit Includes HotRod™ Universal Ignitor Kit - 21D64-2.
Electronic air cleaner Yes
Humidifier Yes
Twin Yes

Features
• 120 VAC Ignitor Output
• 120 VAC Two-Speed Inducer Output
• 120 VAC Humidifier Output
• 120 VAC Electronic Air Cleaner Output
• 120 VAC 3-Speed PSC Circulator Output
• 2-Stage Gas Valve Output
• Fuse Protection - 3 Amp
• Furnace Status LED - Tri-Color
(Green, Red and Amber)
• Heat Fan OFF Delay
(Dipswitch Selectable)
• Fan ON Delay for Cooling
• Auto Second Stage Delay
(Dipswitch Selectable Mode)
• Historical Fault Retrieval by Pushbutton
• YLO, Y, W1, W2, R, G, C, TWIN Terminals
• Pressure Switch Inputs and Monitoring
• Flash Microprocessor with
Non-Volatile Memory
• Flame Current Measurement Points