Fenwal 35-605902-015 Ignition Module

The Fenwal 35-605902-015 Ignition Module is a high-performance 24 VAC direct spark ignition (DSI) control engineered for precision in gas-fired heating systems. This microprocessor-based module is designed to manage the trial-for-ignition sequence, flame sensing, and safety shut-off protocols with military-grade consistency. Built with a Noryl grey enclosure, the unit is protected against harsh mechanical room environments while providing constant microprocessor logic to monitor the burner’s flame rectification. With a 15-second inter-purge and a 10-second trial for ignition, this module ensures reliable light-offs in commercial cooking equipment, furnaces, and boilers. The CSA certified design is polarity insensitive, reducing the risk of installation errors during the replacement of legacy 35-60 series controls. For field diagnostics, it features integrated LED error codes and flame current test pins, allowing technicians to verify the minimum 0.7 microamps signal required for continuous operation without breaching the combustion circuit.

Key Benefits for the Technician:

• On-Board Diagnostics: Rapidly identify system faults using the diagnostic LED indicator for efficient troubleshooting on-site.
• Advanced Safety: Utilizes Detect-A-Flame technology for rapid flame failure response in under 0.8 seconds.
• Flexible Mounting: Non-position sensitive design allows for horizontal or vertical installation in tight HVAC cabinets.
• Universal Gas Compatibility: Engineered for use with natural, LP, and manufactured gases.
• Enhanced Durability: Conformal-coated circuitry provides moisture resistance up to 95% relative humidity (non-condensing).

Common Questions:

What is the proper way to measure flame signal on this module?
Use a DC micro-ammeter connected to the FC+ and FC- test pins. A stable reading of 0.7 microamps or higher is necessary to maintain the gas valve circuit. Each microamp of current corresponds to 1 VDC if using a digital voltmeter.

How do I reset the module after a lockout?
Lockout recovery is achieved by cycling the 24 VAC power at the thermostat or the main power supply for a minimum of 5 seconds. Some configurations may feature an automatic one-hour reset.

Can this replace other 35-60 series modules?
Yes, the 35-605902-015 is a standard OEM ignition module replacement for various DSI configurations. Always verify your specific timing requirements (purge and trial times) against the original data plate.

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.