Lennox 56W22 Limit Switch
The Lennox 56W22 Limit Switch is a critical safety component designed for precise thermal regulation within residential gas furnaces and air handlers. Engineered with a fixed temperature setpoint ranging from 135-165F, this auto-reset furnace limit switch prevents heat exchanger damage and hazardous venting conditions by interrupting the burner circuit when internal plenum temperatures exceed safety thresholds. For service technicians, the 56W22 offers a direct-fit replacement solution, ensuring factory-spec calibration and OEM furnace part reliability. Its bimetal snap-action disc responds rapidly to temperature fluctuations, providing consistent nuisance-trip resistance while maintaining high-limit safety integrity. Whether you are troubleshooting a furnace cycling on high limit or performing a seasonal overhaul, this switch is the standard specification for maintaining Lennox furnace airflow safety and equipment longevity.
Key Benefits for Contractors- Precision Thermal Control: Calibrated for 135°F to 165°F operation, ensuring the system operates within exact design parameters.
- Automatic Reset Functionality: Resets the circuit automatically once temperatures drop below the differential, reducing unnecessary service calls for manual overrides.
- Direct OEM Compatibility: Eliminates spacing and mounting issues common with universal aftermarket switches in tight Lennox blower compartments.
- Enhanced Safety Margin: Protects the heat exchanger from overheating due to restricted airflow, clogged filters, or blower motor failure.
What causes a Lennox limit switch to trip repeatedly?
Frequent tripping is typically symptomatic of restricted airflow. Check for a dirty furnace filter, blocked return ducts, or a failing blower motor capacitor before replacing the switch.
Is the 56W22 compatible with other furnace brands?
While designed primarily for Lennox, Armstrong, and Ducane equipment, it can be used in any application requiring a 135-165F range with a similar mounting profile, provided the electrical ratings match the control circuit.
How do I test the 56W22 during a service call?
Perform a continuity test across the terminals at room temperature. The switch should remain closed. If the circuit is open while the furnace is cool, the internal bimetal disc or contacts have failed.
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.
Lennox 56W22 Limit Switch
The Lennox 56W22 Limit Switch is a critical safety component designed for precise thermal regulation within residential gas furnaces and air handlers. Engineered with a fixed temperature setpoint ranging from 135-165F, this auto-reset furnace limit switch prevents heat exchanger damage and hazardous venting conditions by interrupting the burner circuit when internal plenum temperatures exceed safety thresholds. For service technicians, the 56W22 offers a direct-fit replacement solution, ensuring factory-spec calibration and OEM furnace part reliability. Its bimetal snap-action disc responds rapidly to temperature fluctuations, providing consistent nuisance-trip resistance while maintaining high-limit safety integrity. Whether you are troubleshooting a furnace cycling on high limit or performing a seasonal overhaul, this switch is the standard specification for maintaining Lennox furnace airflow safety and equipment longevity.
Key Benefits for Contractors- Precision Thermal Control: Calibrated for 135°F to 165°F operation, ensuring the system operates within exact design parameters.
- Automatic Reset Functionality: Resets the circuit automatically once temperatures drop below the differential, reducing unnecessary service calls for manual overrides.
- Direct OEM Compatibility: Eliminates spacing and mounting issues common with universal aftermarket switches in tight Lennox blower compartments.
- Enhanced Safety Margin: Protects the heat exchanger from overheating due to restricted airflow, clogged filters, or blower motor failure.
What causes a Lennox limit switch to trip repeatedly?
Frequent tripping is typically symptomatic of restricted airflow. Check for a dirty furnace filter, blocked return ducts, or a failing blower motor capacitor before replacing the switch.
Is the 56W22 compatible with other furnace brands?
While designed primarily for Lennox, Armstrong, and Ducane equipment, it can be used in any application requiring a 135-165F range with a similar mounting profile, provided the electrical ratings match the control circuit.
How do I test the 56W22 during a service call?
Perform a continuity test across the terminals at room temperature. The switch should remain closed. If the circuit is open while the furnace is cool, the internal bimetal disc or contacts have failed.
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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Lennox 56W22 Limit Switch is a critical safety component designed for precise thermal regulation within residential gas furnaces and air handlers. Engineered with a fixed temperature setpoint ranging from 135-165F, this auto-reset furnace limit switch prevents heat exchanger damage and hazardous venting conditions by interrupting the burner circuit when internal plenum temperatures exceed safety thresholds. For service technicians, the 56W22 offers a direct-fit replacement solution, ensuring factory-spec calibration and OEM furnace part reliability. Its bimetal snap-action disc responds rapidly to temperature fluctuations, providing consistent nuisance-trip resistance while maintaining high-limit safety integrity. Whether you are troubleshooting a furnace cycling on high limit or performing a seasonal overhaul, this switch is the standard specification for maintaining Lennox furnace airflow safety and equipment longevity.
Key Benefits for Contractors- Precision Thermal Control: Calibrated for 135°F to 165°F operation, ensuring the system operates within exact design parameters.
- Automatic Reset Functionality: Resets the circuit automatically once temperatures drop below the differential, reducing unnecessary service calls for manual overrides.
- Direct OEM Compatibility: Eliminates spacing and mounting issues common with universal aftermarket switches in tight Lennox blower compartments.
- Enhanced Safety Margin: Protects the heat exchanger from overheating due to restricted airflow, clogged filters, or blower motor failure.
What causes a Lennox limit switch to trip repeatedly?
Frequent tripping is typically symptomatic of restricted airflow. Check for a dirty furnace filter, blocked return ducts, or a failing blower motor capacitor before replacing the switch.
Is the 56W22 compatible with other furnace brands?
While designed primarily for Lennox, Armstrong, and Ducane equipment, it can be used in any application requiring a 135-165F range with a similar mounting profile, provided the electrical ratings match the control circuit.
How do I test the 56W22 during a service call?
Perform a continuity test across the terminals at room temperature. The switch should remain closed. If the circuit is open while the furnace is cool, the internal bimetal disc or contacts have failed.
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.
