Fenwal 35-705902-001 Control

The Fenwal 35-705902-001 is a microprocessor-based Direct Spark Ignition (DSI) control engineered for high-demand gas-fired applications, including commercial cooking equipment, infrared burners, and agricultural heaters. Operating on a 120V AC power supply, this robust DSI module utilizes Fenwal’s proprietary DETECT-A-FLAME technology to ensure a safe start by verifying flame presence before and during operation. This specific model, part of the Fenwal 35-70 series, is configured with a 4-second Trial For Ignition (TFI) and a 0-second pre-purge, making it an ideal HVAC replacement part for systems requiring immediate ignition cycles. The onboard system diagnostic LED provides real-time status updates, significantly reducing troubleshooting time for technicians in the field. Built for durability, it features polarity insensitive flame sensing and a compact footprint that allows for horizontal or vertical mounting in space-constrained industrial enclosures. This control is a reliable choice for maintaining precise, repeatable timing sequences in harsh thermal environments.

• Enhanced Troubleshooting: Integrated diagnostic LED flashes specific fault codes to quickly identify ignition lockout or hardware failures.
• Superior Flame Sensing: The 120V DSI Control uses polarity insensitive circuitry, preventing nuisance lockouts caused by reversed power lines.
• Application Versatility: Designed for an operating temperature range of -40°F to +160°F, suitable for intense commercial gas burner environments.
• Precise Performance: Microprocessor logic delivers +/- 5% timing accuracy, ensuring consistent direct spark ignition across every cycle.
• Safety Certified: UL recognized and FM approved as both an ignition device and a flame safeguard for industrial-grade reliability.

• Can this module replace older Fenwal analog controls? Yes, the Fenwal 35-705902-001 is the modern microprocessor upgrade for discontinued 05-13, 05-14, and 05-38 analog series.
• How do I reset the control after a lockout? Recovery from lockout requires a manual reset by removing the 120V AC power source for at least 5 seconds or cycling the thermostat.
• What does a steady-on LED mean? A steady-on LED indicates an internal control board failure or a software error, necessitating a replacement of the module.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.