Fenwal 35-725205-015 Control

The Fenwal 35-725205-015 is a robust 120V Direct Spark Ignition (DSI) control engineered for precision sequence management in gas-fired heating systems. This microprocessor-based ignition module is specifically configured for 3-trial ignition sequences, providing high-order reliability for both LP and natural gas applications. The 35-725205-015 features a 10-second Trial for Ignition (TFI) window and a 15-second inter-purge interval, ensuring stable flame establishment under various field conditions. Designed with a potted multi-pin connector, this control module offers enhanced protection against vibration and moisture, making it a standard choice for demanding HVACR environments. It utilizes a single-probe design for both sparking and flame sensing via the flame rectification principle. Service technicians can reset the system easily through the thermostat or by cycling the main power, simplifying troubleshooting during lockout events. This direct spark ignition system ensures consistent performance across residential, commercial, and industrial heating platforms.

Key Benefits for Technicians

• Universal Gas Compatibility: Engineered for seamless operation with natural gas or propane (LP) heating equipment.
• Durable Construction: The potted multi-pin connector provides superior environmental protection compared to standard open-board modules.
• Reliable Logic: The three-try ignition sequence reduces nuisance lockouts while maintaining strict safety standards.
• Standardized Timing: Features a 15-second inter-purge and a 10-second TFI, matching many OEM specifications for direct cross-referencing.
• Simplified Wiring: The integrated single-spark and flame sense method reduces the number of required leads in the cabinet.

Common Questions

What does it mean if the Fenwal 35-725205-015 enters lockout?
Lockout occurs after the three-try ignition sequence fails to detect a flame sense signal. This is a safety feature typically triggered by gas valve failure, clogged orifices, or a fouled flame sensor. Reset the system by cycling 120V AC power or the thermostat.

Can this control replace a non-potted 120V Fenwal module?
Yes, as long as the voltage, trials for ignition, and TFI timings match. The potted version is often preferred for high-vibration applications or environments with high ambient humidity.

Does this unit support local or remote flame sensing?
The Fenwal 35-725205-015 is designed for local sensing, utilizing the same electrode for both ignition and flame rectification detection.

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.