Fenwal 35-665936-111 Control

The Fenwal 35-665936-111 is a robust 24VAC Direct Spark Ignition (DSI) control module engineered for precise burner management in commercial and residential heating applications. Operating with a 15-second pre-purge period, this microprocessor-based controller ensures a clean combustion chamber before initiating the ignition sequence. It features a 4-second Trial for Ignition (TFI) and is configured for 3 ignition trials, providing reliable flame establishment while maintaining a safe lockout protocol. This unit serves as the direct replacement for 2466H936-111, ensuring a seamless drop-in fit for existing systems without the need for complex rewiring. The 35-665936-111 gas ignition control utilizes high-voltage spark energy to ignite gas burners directly, monitoring flame presence via flame rectification technology. Designed for durability in demanding HVACR environments, this Fenwal DSI module manages the gas valve and ignition transformer with high-frequency accuracy to prevent nuisance shutdowns and optimize thermal efficiency in commercial furnace controls.

Key Benefits for Field Technicians

• Direct Interchangeability: Seamlessly replaces legacy 2466H936-111 models, reducing diagnostic time and truck stock requirements.
• Multi-Trial Sequence: The 3-try ignition cycle enhances reliability in cold starts or environments with minor gas pressure fluctuations.
• System Safety: Integrated 15-second pre-purge clears residual gases, meeting strict safety standards for 24V gas ignition systems.
• Hardened Circuitry: Designed to withstand the electrical noise and thermal cycling typical of industrial boiler and furnace high-limit strings.
• Diagnostic Feedback: Assists in rapid troubleshooting of flame-out conditions or limit switch interruptions during the heating cycle.

Common Installation & Technical Questions

What is the purpose of the 15-second pre-purge on this module?
The pre-purge allows the inducer fan to exhaust any unburned gas from the combustion chamber, ensuring a safe environment before the Fenwal 35-665936-111 initiates the high-voltage spark.

Can this control be used in single-trial applications?
No, this specific model is programmed for 3 ignition trials. Using a multi-trial module in a system designed for a single-trial lockout should only be done if it matches the manufacturer's updated technical specifications for the appliance.

Does this module support remote flame sensing?
Yes, this DSI control is compatible with local sensing (through the spark electrode) or remote flame rod sensing, depending on the wiring configuration of your specific burner assembly.

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.