Flame Safeguard feature in Series 35-72 Controllers provide Lockout Recovery (Single Trial Mode). If the burner does not light after the first attempt, the control will de-energize the gas valve and go into lockout mode. The control will not open the gas valve unless there is intervention by the user. Flame safeguard is also called a single trial mode function.

Flame safeguard in models with a multi trial mode: If the burner does not light after the first attempt, the inter-purge sequence is completed between attempts to re-light the burner. If the burner fails to light after the third try, the control will de-energize the gas valve and go into lockout mode.

About the Series 35-72
The 35-72 is a 120 VAC direct spark ignition control for controlling a gas valve and igniting LP or natural gas on heating equipment that provides a 120 VAC operating voltage. The microprocessor circuit design provides precise, repeatable timing sequences for ignition times, purge times (pre- and inter-) along with multiple tries for ignition and flame sensing during pre-purge.

Series Features:
• Compact size

Agency Certifications:
• UL and CSA certified

Enclosure, Mounting and Size:
• Uncovered with standoffs: 4.00” x 2.30” x 1.98”
• With potting shell: 5.37” x 2.53” x 2.35”
 
Applications:
• Commercial & industrial heaters
• Infrared heaters
• Cooking equipment

About Fenwal Controls
Founded in 1935 as the manufacturer of the patented THERMOSWITCH® temperature controller, Fenwal Controls provides agency-approved standard and custom engineered gas ignition and temperature controls for many industries including HVAC, hydronics, commercial cooking, and fire protection. The Fenwal brand of temperature and gas ignition products is widely recognized for its high quality and reliability, and all Fenwal products are designed to provide excellent performance in the most demanding applications.

In addition to being a leading supplier of gas ignition and temperature control components, Fenwal’s applications lab is available to provide extensive product configuration & development services to commercial and industrial manufacturers.

Fenwal's engineering and manufacturing system is certified to the international standards of ISO 9001, and many Fenwal products are now fully compliant with RoHS (Restriction on Hazardous Substances) and WEEE (Waste Electrical and Electronic Equipment) European directives.