3L01-120 Limit Copeland Comfort Control (White Rodgers) 110°F 120°F
3L01-120 Limit Copeland Comfort Control (White Rodgers) 110°F 120°F
The 3L01-120 Snap Disc Limit Switch (60T11-610000) is an automatic reset temperature safety control designed to protect HVAC and heating equipment from overheating. Featuring a 120°F fixed cut-out temperature and 110°F fixed cut-in temperature, this open-on-rise snap disc switch interrupts the control circuit when temperatures exceed safe operating limits and automatically resets after cooling.
Cross-Reference
- 3L01-120
- 3L01120
- 60T11-610000
- White-Rodgers 3L01-120
- Copeland Comfort Control 3L01-120
Direct OEM
White-Rodgers 3L01-120
Compatible Brands
- Copeland
- White-Rodgers
- Emerson
- Universal HVAC Applications
- Heat Pumps
- Refrigeration Equipment
- HVAC Control Systems
Application
Used in heating and cooling equipment to:
- Protect components from overheating
- Open the circuit when temperature rises to 120°F
- Automatically reset when temperature falls to 110°F
- Protect compressors and control circuits
- Prevent excessive operating temperatures
Related Components
- Snap Disc Limit Switch
- Fan Switch
- High Limit Control
- Defrost Control
- Transformer
- Compressor Contactor
- Control Board
- Temperature Sensor
Technician Notes
The 3L01-120 is an automatic reset, open-on-rise limit switch. The contacts remain closed during normal operation and open when the sensed temperature reaches 120°F. Once the temperature cools to 110°F, the contacts automatically reset. When replacing, ensure the switch action, temperature ratings, mounting style, and electrical specifications match the original part.
Common Symptoms of Failure
- Equipment shuts down unexpectedly
- Open safety circuit
- Compressor fails to operate
- Intermittent operation
- Nuisance temperature trips
- No continuity through switch
- Control board safety lockout
- Heating or cooling system interruptions
Installation Tips
- Disconnect power before servicing.
- Verify the replacement temperature ratings match the original.
- Confirm switch action is "Open on Rise."
- Mount firmly against the original sensing surface.
- Inspect terminals for overheating or corrosion.
- Check system airflow and operating temperatures.
- Verify switch operation after installation.
- Test complete system operation before returning equipment to service.
Recommended Inspection Items
- Airflow across equipment
- Compressor operating temperature
- Electrical terminals
- Wiring harness condition
- Contactor operation
- Control board diagnostics
- Fan motor performance
- Coil cleanliness
- Supply voltage
Controls, Temperature, 110 degrees F Fixed Cut-in Temperature, 120 degrees F Fixed Cut-out Temperature, Open on Rise Switch Action, Snap Disc Auto Reset Limit Switch (60T11-610000)
