Fenwal 35-615526-227 Control

The Fenwal 35-615526-227 is a microprocessor-based 24V Direct Spark Ignition (DSI) control engineered for precision flame supervision in gas-fired equipment. This specialized ignition module features a 3-try ignition sequence to ensure reliable burner start-up in demanding environments. Designed with a 15-second Trial for Ignition (TFI) and a 30-second pre-purge, it optimizes combustion safety by clearing the combustion chamber before the sparking cycle begins. The integrated 30-second post-purge and inducer blower relay allow for effective venting of flue gases after the heating cycle concludes.

Utilizing proprietary DETECT-A-FLAME technology, this control provides consistent remote flame sensing (RmS) with a minimum sensitivity of 0.7 µA. The rugged design is not position-sensitive and includes on-board LED diagnostics for rapid troubleshooting of airflow faults or flame failures. It is a drop-in solution for commercial cooking equipment, boilers, and furnaces requiring a dependable 24 VAC interface for inter-purge and safety monitoring.

• Enhanced Safety: High-speed flame failure response time of less than 0.8 seconds ensures immediate gas valve closure.
• System Reliability: Microprocessor logic manages the 3-try ignition routine and airflow switch monitoring to prevent nuisance lockouts.
• Diagnostic Capabilities: On-board LED flashes specific fault codes, significantly reducing downtime during field service.
• Versatile Application: Supports both local and remote flame sensing configurations for various burner geometries.
• Inducer Integration: Built-in inducer blower relay simplifies wiring by centralizing motor and gas valve control.

What is the purpose of the 30sPP and 30sPP designations on this module?
These indicate the 30-second pre-purge and 30-second post-purge timings. The pre-purge ensures the combustion chamber is clear of residual gas before ignition, while the post-purge clears the heat exchanger of secondary combustion byproducts.

Can I use this control for both Natural Gas and LP applications?
Yes, the 35-61 series is compatible with Natural, LP, and manufactured gases, provided the appliance is regulated to the correct manifold pressure.

How do I troubleshoot a lockout on this Fenwal unit?
Check the diagnostic LED. A steady on or specific flash pattern will identify if the issue is a 15-second TFI failure, a pressure switch stuck open/closed, or an internal microprocessor fault.

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.