Fenwal 35-679927-561 Module

The Fenwal 35-679927-561 Ignition Control Module is a microprocessor-based 24 VAC direct spark ignition system engineered for heavy-duty commercial and industrial combustion appliances. This hot surface ignition (HSI) module features proven HSI technology with a built-in blower relay and remote reset functionality, making it a critical component for high-output systems exceeding 400,000 BTU. Designed for multi-trial ignition, the unit monitors the heating cycle with precise timing for pre-purge, inter-purge, and ignition trials. The integrated diagnostic LED provides real-time status, simplifying HVAC troubleshooting for contractors working with complex burner assemblies. It meets stringent safety standards, including CSD-1 certification requirements, by offering continuous flame sensing and pressure switch monitoring to prevent unsafe firing conditions.

Key Benefits for Technicians

• Enhanced Reliability: Microprocessor control ensures consistent ignition timing and burner sequencing for high-efficiency HVAC systems.
• Streamlined Diagnostics: Built-in LED simplifies field maintenance by identifying flame failure or gas valve issues instantly.
• Integrated Control: The onboard blower relay manages 120/240V air movement without the need for additional external relays.
• Reduced Downtime: The remote reset feature allows for system recovery from a centralized control panel without manual intervention at the unit.
• Versatile Compatibility: Designed for large combustion chambers and industrial process heaters requiring a Fenwal ignition control with 24V inputs.

Common Questions

What does 'Proven HSI' mean on this Fenwal module?
Proven Hot Surface Ignition means the module verifies the igniter has reached sufficient temperature for combustion before opening the gas valve, preventing raw gas accumulation.

How do I interpret the diagnostic code on the 35-67 series?
The LED flashes specific patterns to indicate Lockout, Flame without Heat, or Internal Fault; always consult the wiring diagram on the housing for the specific flash code legend.

Can this replace a single-trial ignition module?
While technically superior, you must ensure the 24 VAC operation and timing specifications match your appliance's safety requirements and OEM specifications for 3-trial systems.

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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.