Fenwal 35-725205-115 Control

The Fenwal 35-725205-115 is a microprocessor-based 120V Direct Spark Ignition (DSI) control designed for precise burner sequencing in gas-fired heating equipment. This potted ignition module is engineered for high-vibration and washdown environments, providing robust protection for the internal circuitry. It features a 15-second pre-purge cycle to clear the combustion chamber and a 10-second Trial for Ignition (TFI) period. With a 3-trial ignition sequence, the control attempts to establish a flame through multiple start cycles before entering a safety lockout, improving system reliability in cold-start conditions. The multi-pin connector ensures a secure, fast assembly for field replacements, while the single spark and sense technology streamlines flame monitoring by utilizing the same electrode for both functions. Reliable across natural gas and propane applications, this 120 VAC controller maintains repeatable safety timings and is a standard choice for contractors requiring durable HVAC ignition modules.

• Environmental Protection: The potted enclosure safeguards against moisture, dust, and extreme mechanical vibration common in industrial HVACR applications.
• Reliable Start-up: Integrated 3-try ignition trial reduces nuisance lockouts by allowing the system to attempt combustion three times before safety shutdown.
• Precise Timing: Microprocessor control delivers consistent 15s pre-purge and 10s TFI intervals for optimized fuel delivery and safety.
• Simplified Wiring: Features a 6-pin terminal configuration for quick "plug-and-play" installation in compatible 120V systems.
• Safety Lockout: Automatically de-energizes the gas valve if a flame is not sensed, requiring a thermostat or power-off reset for technician safety.

Is the Fenwal 35-725205-115 compatible with propane systems?
Yes, this control is designed to work with natural gas, LP (propane), and manufactured gas systems, provided the appliance matches the 120 VAC input requirement.

What does the 15-second pre-purge do?
The pre-purge period energizes the combustion blower to clear any residual gas from the heat exchanger before the spark is initiated, ensuring a safe ignition cycle.

How do I reset the module if it goes into lockout?
The 35-725205-115 utilizes a thermostat or power-off reset. Simply cycle the call for heat at the thermostat or interrupt the 120V power supply to the control to initiate a new sequence.

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.