Lennox 12L46 Pressure Switch
The Lennox 12L46 Pressure Switch is a critical safety component designed for precise furnace air pressure monitoring in Lennox heating systems. Featuring a factory-set actuation point of .40" wc (water column) and a 0.55" wc reset, this SPST (Single-Pole Single-Throw) switch ensures the inducer motor is generating sufficient draft before allowing the ignition sequence to proceed. As a veteran-grade OEM Lennox replacement part, it is engineered to withstand the thermal cycling and humidity typical of high-efficiency combustion environments. The configuration utilizes dual 1/4" barb connections for secure pneumatic line attachment, preventing air leaks that lead to nuisance pressure switch open fault codes. This switch, also cross-referenced as 12L4601 or Honeywell IS20170-3460, protects the heat exchanger by validating proper airflow and flue venting. For contractors performing a Lennox furnace repair, this switch provides the exact electrical ratings (up to 15A at 125VAC) and mechanical tolerances required to restore original equipment performance and HVAC safety standards.
Key Benefits- Precise Actuation: Calibrated to .40" wc to ensure the system only fires under optimal venting conditions.
- OEM Compatibility: Direct replacement for Lennox 12L46 and 12L4601, maintaining the equipment's original safety listing.
- High-Durability Diaphragm: Engineered to resist rupturing or sticking, reducing callbacks caused by intermittent furnace shutdown.
- Secure Pneumatic Interface: The dual 1/4" barb design facilitates a tight seal with standard pressure tubing, minimizing signal loss.
- Standardized Electrical: Features a universal SPST contact configuration for straightforward integration into existing 24V or 120V control circuits.
How do I troubleshoot a Lennox "Pressure Switch Open" error?
Before replacing the Lennox 12L46, check for obstructions in the flue vent, water accumulation in the pressure switch hose, or a failing inducer motor. If the motor is running and the lines are clear, use a manometer to verify if the .40" wc threshold is being met.
Can I use this switch for different set-point requirements?
No. Pressure switches are calibrated to specific inches of water column. Using a switch with an incorrect rating can lead to dangerous combustion conditions or prevent the furnace from starting. Always match the .40" wc specification exactly.
Does this switch handle high-voltage applications?
Yes, the 12L46 is rated for up to 15 amps at 125VAC, though it is most commonly utilized in 24VAC safety pilot or ignition control circuits in residential and commercial furnaces.
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.
Original: $91.62
-65%$91.62
$32.07Lennox 12L46 Pressure Switch
The Lennox 12L46 Pressure Switch is a critical safety component designed for precise furnace air pressure monitoring in Lennox heating systems. Featuring a factory-set actuation point of .40" wc (water column) and a 0.55" wc reset, this SPST (Single-Pole Single-Throw) switch ensures the inducer motor is generating sufficient draft before allowing the ignition sequence to proceed. As a veteran-grade OEM Lennox replacement part, it is engineered to withstand the thermal cycling and humidity typical of high-efficiency combustion environments. The configuration utilizes dual 1/4" barb connections for secure pneumatic line attachment, preventing air leaks that lead to nuisance pressure switch open fault codes. This switch, also cross-referenced as 12L4601 or Honeywell IS20170-3460, protects the heat exchanger by validating proper airflow and flue venting. For contractors performing a Lennox furnace repair, this switch provides the exact electrical ratings (up to 15A at 125VAC) and mechanical tolerances required to restore original equipment performance and HVAC safety standards.
Key Benefits- Precise Actuation: Calibrated to .40" wc to ensure the system only fires under optimal venting conditions.
- OEM Compatibility: Direct replacement for Lennox 12L46 and 12L4601, maintaining the equipment's original safety listing.
- High-Durability Diaphragm: Engineered to resist rupturing or sticking, reducing callbacks caused by intermittent furnace shutdown.
- Secure Pneumatic Interface: The dual 1/4" barb design facilitates a tight seal with standard pressure tubing, minimizing signal loss.
- Standardized Electrical: Features a universal SPST contact configuration for straightforward integration into existing 24V or 120V control circuits.
How do I troubleshoot a Lennox "Pressure Switch Open" error?
Before replacing the Lennox 12L46, check for obstructions in the flue vent, water accumulation in the pressure switch hose, or a failing inducer motor. If the motor is running and the lines are clear, use a manometer to verify if the .40" wc threshold is being met.
Can I use this switch for different set-point requirements?
No. Pressure switches are calibrated to specific inches of water column. Using a switch with an incorrect rating can lead to dangerous combustion conditions or prevent the furnace from starting. Always match the .40" wc specification exactly.
Does this switch handle high-voltage applications?
Yes, the 12L46 is rated for up to 15 amps at 125VAC, though it is most commonly utilized in 24VAC safety pilot or ignition control circuits in residential and commercial furnaces.
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.
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Description
The Lennox 12L46 Pressure Switch is a critical safety component designed for precise furnace air pressure monitoring in Lennox heating systems. Featuring a factory-set actuation point of .40" wc (water column) and a 0.55" wc reset, this SPST (Single-Pole Single-Throw) switch ensures the inducer motor is generating sufficient draft before allowing the ignition sequence to proceed. As a veteran-grade OEM Lennox replacement part, it is engineered to withstand the thermal cycling and humidity typical of high-efficiency combustion environments. The configuration utilizes dual 1/4" barb connections for secure pneumatic line attachment, preventing air leaks that lead to nuisance pressure switch open fault codes. This switch, also cross-referenced as 12L4601 or Honeywell IS20170-3460, protects the heat exchanger by validating proper airflow and flue venting. For contractors performing a Lennox furnace repair, this switch provides the exact electrical ratings (up to 15A at 125VAC) and mechanical tolerances required to restore original equipment performance and HVAC safety standards.
Key Benefits- Precise Actuation: Calibrated to .40" wc to ensure the system only fires under optimal venting conditions.
- OEM Compatibility: Direct replacement for Lennox 12L46 and 12L4601, maintaining the equipment's original safety listing.
- High-Durability Diaphragm: Engineered to resist rupturing or sticking, reducing callbacks caused by intermittent furnace shutdown.
- Secure Pneumatic Interface: The dual 1/4" barb design facilitates a tight seal with standard pressure tubing, minimizing signal loss.
- Standardized Electrical: Features a universal SPST contact configuration for straightforward integration into existing 24V or 120V control circuits.
How do I troubleshoot a Lennox "Pressure Switch Open" error?
Before replacing the Lennox 12L46, check for obstructions in the flue vent, water accumulation in the pressure switch hose, or a failing inducer motor. If the motor is running and the lines are clear, use a manometer to verify if the .40" wc threshold is being met.
Can I use this switch for different set-point requirements?
No. Pressure switches are calibrated to specific inches of water column. Using a switch with an incorrect rating can lead to dangerous combustion conditions or prevent the furnace from starting. Always match the .40" wc specification exactly.
Does this switch handle high-voltage applications?
Yes, the 12L46 is rated for up to 15 amps at 125VAC, though it is most commonly utilized in 24VAC safety pilot or ignition control circuits in residential and commercial furnaces.
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.
