Description
The Copeland 3L09-12 is a board mount snap disc limit control featuring a 1/2-inch bimetal disc element calibrated to open at 220°F and close at 190°F, providing a 30°F differential for automatic reset high-limit circuit protection in gas furnaces, electric heating equipment, and related HVAC systems where component-level temperature sensing near control boards or heat-sensitive assemblies is required. The board mount configuration positions the 1/2-inch bimetal disc for direct installation onto a control board, component bracket, or equipment panel surface within the unit enclosure, allowing localized overtemperature sensing in areas where heat buildup near electronic components or control circuitry represents a risk to equipment integrity and safe operation. The open-at-220°F set point places this limit control within the high-limit range appropriate for heat exchanger adjacent sensing, electric heat element monitoring, and control enclosure overtemperature protection in residential and light commercial heating equipment. The 30°F differential between the open and close set points establishes a defined temperature recovery band that prevents rapid cycling and ensures adequate equipment cool-down before the limit control resets and restores the interrupted circuit. As an OEM-quality White-Rodgers replacement, the 3L09-12 is a direct-fit service component for heating systems and control assemblies specifying a board mount snap disc limit control in this temperature and disc size configuration.
Key Features
- Board mount configuration for direct installation to control boards, component brackets, or equipment panel surfaces within unit enclosures
- 1/2-inch bimetal disc element provides localized overtemperature sensing near heat-sensitive components and control circuitry
- Opens at 220°F and closes at 190°F delivering a 30°F differential for controlled high-limit circuit interruption and automatic reset
- 30°F differential prevents rapid cycling and ensures adequate equipment cool-down before circuit restoration
- Open-at-220°F set point suited for heat exchanger adjacent sensing, electric heat element monitoring, and control enclosure protection
- Automatic reset function restores normal circuit operation once sensed temperature drops below the 190°F close set point
- Snap disc bimetal switching action delivers fast, repeatable circuit interruption without external power or control signals
- OEM-quality White-Rodgers replacement for heating systems specifying board mount snap disc limit controls in this temperature and disc size configuration
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