White-Rodgers 50A55-743 Hot Surface Furnace Control Kit

White-Rodgers 50A55-743 Hot Surface Furnace Control Kit is a Type 1-Stage integrated control for gas furnaces. It supports natural, manufactured, mixed, liquefied petroleum and propane gas air mixtures, and uses a silicon carbide igniter with a 2-trial ignition sequence, a 4-second ignition trial time, and a 15-second prepurge for reliable starts.

CSA-approved and designed to control ignition, gas valve, blower, inducer, humidifier, and air cleaner connections in one compact package. Key specifications include 0.45 A input at 30 VAC; valve rating 0.6 PF, 1.5 A at 25 VAC; igniter relay 6 A at 120 VAC; inducer relay 2.2–3.5 A; circulator relay 14.5–25 A; and a flame failure response time of 2 seconds. The unit measures 4.375" W x 1.25" D x 5.875" H and operates from -40 to 175 deg F.

• All-in-One Type 1-Stage integrated control for gas furnaces
• Silicon Carbide igniter with 2-trial ignition sequence (4 s trial, 15 s prepurge)
• Flame failure response within 2 seconds for safety
• Broad gas compatibility: natural, manufactured, mixed, LP and LP-gas air mixtures
• CSA approved for US and Canada
• Compact footprint: 4.375"W x 1.25"D x 5.875"H
• Includes Flash Code Diagnostic for quick troubleshooting