The Fenwal 35-725205-021 Direct Spark Ignition Control Module is a reliable ignition control designed to manage safe and efficient burner ignition in gas-fired HVAC equipment. Operating on 120V, it features a three-try ignition sequence, zero-second prepurge, and a four-second trial for ignition (TFI) with a durable potted construction for enhanced protection. Commonly used in furnace... https://www.partshnc.com/35-725205-021-fenwal-120v-dsi-3try-0pp-4tfi-potted