Fenwal 35-615908-223 Control

The Fenwal 35-615908-223 is a 24 VAC microprocessor-based Direct Spark Ignition (DSI) control specifically engineered as an Armstrong furnace replacement. Designed for heavy-duty gas-fired heating applications, this module integrates an onboard inducer blower relay to coordinate combustion airflow before ignition. It features a critical 30-second pre-purge and a 30-second inter-purge timing cycle, which clears the combustion chamber of residual gases to prevent delayed ignition or "roll-out" conditions. The microprocessor-based logic continuously monitors the flame rectification signal, utilizing DETECT-A-FLAME® technology for high-speed flame sensing and safe burner operation.

Built for the rigors of the field, the Fenwal 35-615908-223 includes a system diagnostic LED that provides immediate fault code feedback, streamlining the troubleshooting process for industrial and residential HVAC systems. This control is compatible with natural gas, propane (LP), and manufactured gas, ensuring broad utility across various gas furnaces and boilers. Its compact design features standard terminal configurations for matching existing wiring harnesses in Armstrong equipment, reducing installation time and ensuring precise ignition sequencing.

Key Benefits

• Integrated Blower Control: Features a dedicated 24V relay to manage the inducer motor for optimized air-to-fuel ratios.
• Microprocessor Precision: The digital logic ensures consistent trial for ignition (TFI) periods and enhanced safety monitoring.
• Universal Fuel Compatibility: Fully rated for both natural gas and liquid propane systems.
• Diagnostic LED: Provides clear blink codes for rapid identification of pressure switch or flame sense issues.
• Automatic Reset: Equipped with a one-hour automated reset feature following a lockout condition to maintain system uptime.

Common Questions

Can the Fenwal 35-615908-223 be used in place of an older intermittent pilot control?
No, this is a Direct Spark Ignition (DSI) control designed to spark directly to the main burner. It is not a drop-in replacement for intermittent pilot systems unless the entire ignition assembly is converted.

What do the LED blink codes indicate?
Common codes include a single flash for an airflow fault (check your pressure switch), two flashes for a false flame error, and three flashes for an ignition lockout after unsuccessful trials.

Does this module require a local or remote flame sensor?
The 35-615908-223 supports both local and remote flame sensing; however, most Armstrong applications utilize the spark electrode itself for flame rectification back to the module.

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.