Fenwal 35-705506-011G Ignition Module

The Fenwal 35-705506-011G Ignition Module is a professional-grade 120V direct spark ignition (DSI) control engineered for high-performance gas-fired heating systems, industrial burners, and commercial HVAC equipment. As a microprocessor-based ignition control, this unit offers superior precision in timing sequences compared to legacy analog models. This specific module is the direct replacement for Fenwal 35-705506-011, providing a seamless retrofit for technicians servicing older installations. It features a 5-second Trial for Ignition (TFI) period with a 0-second prepurge, ensuring immediate response upon a call for heat. The 35-705506-011G is designed to handle extreme environments, with an operating temperature range of -40°F to 175°F. Integrated on-board diagnostics via LED output allow for rapid troubleshooting of ignition failures or flame sensing issues, while the polarity insensitive design simplifies field wiring and reduces the risk of installation errors.

Key Benefits for Contractors:

• Direct OEM Replacement: Drop-in compatibility for the discontinued 35-705506-011 model with identical 120VAC electrical footprints.
• Enhanced Troubleshooting: Multi-function diagnostic LED provides clear error codes to identify gas valve issues, flame sensing faults, or internal hardware failures.
• Robust Combustion Control: Utilizes microprocessor circuitry for repeatable 5-second TFI timing and reliable flame establishment in propane or natural gas applications.
• Field Versatility: Supports both single spark/sense and remote flame sensing configurations to match specific burner hardware.
• Safety Monitoring: Automatic one-hour reset functionality and continuous flame monitoring ensure safe system operation during extended heating cycles.

Common Questions:

How do I measure the flame signal on this module?
Use a DC microammeter connected to the integrated flame current test pins. A stable signal of at least 0.7 to 1.0 microamps is required for reliable operation.

Will this board work with my 24V thermostat?
This is a 120V ignition module. Ensure the power supply (L1/L2) and the operating signal from the thermostat or primary controller match the 120VAC requirement specified in the technical data sheet.

What does it mean if the LED is flashing?
The LED flashes indicate specific fault codes. For instance, three flashes typically signify an ignition lockout after the allotted trials for ignition have been exhausted without detecting a flame.

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.