Fenwal 35-704600-005 Control

The Fenwal 35-704600-005 is a 120VAC Direct Spark Ignition (DSI) control module designed for high-performance gas-fired furnace and heating applications. This microprocessor-based control provides a 10-second Trial for Ignition (TFI) period, ensuring reliable flame establishment in demanding environments. Engineered for versatility, this model features a No Pre-Purge (NoPP) configuration, making it a critical drop-in component for systems requiring immediate ignition sequence initiation. The 35-70 series control utilizes sophisticated flame sensing circuitry to monitor combustion and provides a single-try ignition sequence. With a compact footprint and standard 1/4" quick-connect terminals, this Fenwal ignition module is the industry standard for contractors servicing commercial water heaters, infrared heaters, and commercial cooking equipment that require precise 120V ignition logic and consistent flame rectification performance.

• Efficient Ignition Logic: The 120V DSI sequence eliminates the need for standing pilots, improving overall system combustion efficiency.
• Precise Timing Profile: Fixed 10-second TFI ensures stable gas valve operation and reduces lockout frequency on cold starts.
• Rugged Electrical Design: Built to withstand transient voltage spikes common in commercial HVACR environments.
• Direct Application Fitting: No Pre-Purge (NoPP) design allows for immediate sparking, essential for specific Fenwal controller retrofits.

Can I use this 35-704600-005 to replace a module with a pre-purge timing?
No. This specific configuration is a non-purge control. Replacing a pre-purge unit with a NoPP module can lead to safety concerns or improper venting sequences. Always match the technical suffix on your existing Fenwal gas ignition control.

What is the primary indicator for a failed DSI control?
Failure to provide high voltage spark or a failure to sense flame (resulting in immediate lockout) are the most common symptoms. Ensure your flame sensor is clean and have a technician verify the 120VAC input before replacing the module.

Is this unit compatible with recurring ignition trials?
No, this specific 35-704600-005 is a single-try ignition module. If the flame is not established within the 10-second TFI, the system will enter a safety lockout mode until manually reset.

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.