Fenwal 35-605939-337 Ignition Module

The Fenwal 35-605939-337 Ignition Module is a high-performance, 24V Direct Spark Ignition (DSI) control specifically engineered for Roberts Gordon heating systems and serves as the primary replacement for 790-325. This microprocessor-based control manages the ignition sequence, including the combustion blower, gas valve, and spark transformer. Designed for heavy-duty commercial and industrial applications, it supports natural, manufactured, and LP gas. It features refined safety protocols, including constant flame sensing monitoring with a 0.7 µA minimum signal and multi-try ignition sequences to ensure reliable light-off in demanding conditions. Its rugged construction allows for a broad operating temperature range from -40°F to 160°F, making it a standard choice for gas furnace ignition control and boiler service. The Fenwal DSI module also includes built-in diagnostics via an LED indicator and flame current test pins, allowing technicians to troubleshoot issues without breaking the control circuit.

Key Technical Benefits:

• Direct Cross-Reference: Specifically designed as the Roberts Gordon replacement ignition control for model 790-325, ensuring proper fit and terminal alignment.
• Advanced Diagnostics: Features a system LED for quick fault code identification and dedicated test pins for measuring microamp flame current.
• Robust Safety Timings: Integrated combustion blower control with precise prepurge and interpurge timings to clear the combustion chamber safely.
• Automatic Reset: Equipped with a one-hour reset function following a lockout, reducing unnecessary service calls for temporary environmental issues.
• Multi-Fuel Versatility: Certified for use with multiple fuel types, providing flexibility across various HVAC replacement ignition control scenarios.

Common Questions:

Can I use this to replace a local sensing module?
Yes, the Fenwal 35-605939-337 is designed for both local and remote flame sensing. Ensure your electrode configuration matches the required 0.7 µA minimum flame signal for stable operation.

What does the diagnostic LED indicate?
The LED provides real-time feedback on system status. A steady on indicates normal operation, while specific flash patterns identify airflow faults, flame failure, or internal module errors.

Is this module compatible with LP gas applications?
This 24VAC ignition module is fully compatible with propane (LP) gas when used with the appropriate gas valve and orifice settings in the appliance.

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.