3L09-15 Copeland Comfort Control (White Rodgers) Board Mount Limit Control 260F
3L09-15 Copeland Comfort Control (White Rodgers) Board Mount Limit Control 260F
The 3L09-15 Board Mount Limit Control (White-Rodgers / Copeland Comfort Control) is an automatic reset temperature safety switch designed to protect HVAC equipment, control boards, transformers, electric heating systems, and electrical compartments from overheating. Featuring a 260°F fixed open temperature, this compact board-mounted bimetal limit switch interrupts the electrical circuit when excessive temperatures are detected and automatically restores operation after cooling, helping protect sensitive components from heat-related damage and ensuring reliable equipment performance.
Cross-Reference
- 3L09-15
- 3L0915
- L260F
- White-Rodgers 3L09-15
- Copeland Comfort Control 3L09-15
- 74T Series Board Mount Limit Control
Direct OEM
White-Rodgers 3L09-15
Compatible Brands
- White-Rodgers
- Emerson
- Copeland
- York
- Coleman
- Luxaire
- Goodman
- Rheem
- Universal HVAC Applications
Application
Used in HVAC and electrical equipment to:
- Protect control boards from overheating
- Interrupt safety circuits at elevated temperatures
- Automatically restore operation after cooling
- Protect transformers and electrical enclosures
- Safeguard electric heating systems
- Prevent temperature-related component failures
Related Components
- Board Mount Limit Switch
- Snap Disc Thermostat
- Furnace Control Board
- Transformer
- Blower Relay
- High Limit Control
- Temperature Sensor
- Safety Cutoff Switch
- Electrical Control Assembly
Technician Notes
The 3L09-15 is an automatic reset, open-on-rise board mount limit control utilizing a compact bimetal sensing disc. Under normal operating conditions, the contacts remain closed and open when the sensing surface reaches 260°F, interrupting the circuit to prevent overheating. Once the temperature drops below the factory reset point, the contacts automatically reclose and restore normal operation.
This limit control is commonly used in electrical compartments, transformer protection circuits, control boards, electric heat assemblies, and OEM HVAC applications requiring dependable high-temperature protection in a compact package.
Common Symptoms of Failure
- Equipment shuts down unexpectedly
- Open safety circuit faults
- Intermittent operation
- Repeated high-temperature shutdowns
- Control board overheating faults
- No continuity through switch contacts
- Failure to reset properly
- Electrical compartment overheating
- Transformer thermal overload conditions
Installation Tips
- Disconnect power before servicing.
- Verify the replacement temperature rating matches the original control.
- Confirm switch action is Open on Rise.
- Mount securely in the original location.
- Inspect terminals for corrosion or heat discoloration.
- Verify adequate airflow around electrical components.
- Check continuity after installation.
- Test operation through a complete equipment cycle.
Recommended Inspection Items
- Control board condition
- Transformer temperature
- Wiring harness connections
- Electrical terminals
- Blower motor operation
- Airflow restrictions
- Ventilation around controls
- Relay condition
- Equipment operating temperatures
- Nearby heat-generating components
Controls, Temperature, 260 degrees F Fixed Open Temperature, 230 degrees F Fixed Close Temperature, Open on Rise Switch Action, Auto Reset, 3.12" Insertion Length, Board Mounted 1/2" Bimetal Disc Limit Switch
