21M51U-843 MFG #: 21M51U-843
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White-Rodgers™ 21M51U-843 Universal Hot Surface Ignition Control, 15-1/2 in Lead, 15-1/2 in Probe, 25 VAC, 530 mA

White-Rodgers™ Hot Surface Ignition Control, Universal, 15-1/2 in Lead Length, 15-1/2 in Probe Length, 25 VAC, 530 mA, 1/4 in Spade Terminal and Molex Plug, Natural Gas/Liquid Propane, 17 sec Igniter Warm-Up Time, 5-1/4 in Width, 1-1/4 in D, 8 in Height, Import

The 50M51-843 is a universal replacement control for two stage automatic gas ignition controls employing a microprocessor to continually monitor, analyze, and control the proper operation of the gas burner and inducer. the 50M51-843 controls a multiple tapped induction circulation blower signals interpreted during continual surveillance of the two stage thermostat and flame sensing element initiate automatic ignition of the burner, sensing of the flame, and system shutoff during normal operation. the control incorporates system fault analysis for quick gas flow shutoff coupled with automatic ignition retry upon sensing a fault correction. the 50M51-843 quickly and easily replaces white Rodgers 50M51-XXX controls.

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