50M56U-751 White Rodgers for Carrier Bryant 325878-751, HK42FZ013, HK42FZ011. White Rodgers Fan Blower Control Board Part Number 50M56U-751. This item is Brand New. Unused and in the Package. White Rodgers Furnace Control Kit for Carrier Single Stage HSI. This board is a replacement for the following numbers. Carrier: HK42FZ004, HK42FZ007, HK42FZ008, HK42FZ009, HK42FZ011, HK42FZ013, HK42FZ014, HK42FZ016, 325878-751. Easy Install Kit includes everything you need for quick and accurate replacement. Installation Instructions and OEM Cross-Reference. Set of Interconnect Harnesses. Maximum ignitor warm-up 19. Ignition activation period 2. Trial for ignition period 4. Valve sequence period 12. Heat delay to fan ON 25/60. Heat delay to fan OFF 90/120. Cool delay to fan ON 2. Cool delay to fan OFF 5/90. Auto reset 60 minutes. These times will vary depending on option switch position. See OPERATION section for further information. Fan Blower Control Board. System Diagnostic LED with Fault Recall. Low-Speed Continuous Fan Option. 120 VAC Ignitor Output. 120 or 24 VAC Humidifier Output. 120 VAC Electronic Air Cleaner Output. Check out my other items.