Lennox 51M87 Pressure Switch
The Lennox 51M87 is a precision-engineered furnace pressure switch designed for critical venting safety within Lennox HVAC systems. This 1.6" WC SPDT N.O. pressure switch functions as a fail-safe, ensuring the inducer motor is generating adequate static pressure before allowing the ignition sequence to proceed. The 51M8701 is the identical direct replacement, maintaining the exact factory set point of 1.60 inches of water column. As a Single Pole Double Throw (SPDT) component with a Normally Open (N.O.) configuration, it integrates seamlessly with the control board to monitor for blocked flues or failed draft inducer blowers. For contractors performing Lennox furnace repair, this part is essential for resolving pressure switch stuck open codes and restoring reliable combustion air validation. Its robust construction ensures durability against the thermal cycling and vibration common in residential heating applications.
Key Benefits
- OEM Compatibility: Precision-calibrated 1.6" WC set point ensures exact matching with Lennox furnace parts specifications.
- Direct Replacement: Fully interchangeable with Lennox 51M8701, simplifying inventory and field installation.
- Reliable Safety Integration: SPDT N.O. circuitry prevents burner operation during hazardous venting conditions.
- Rugged Design: Built to withstand the high-demand environments of HVAC draft inducer assemblies.
- Accurate Sensing: High-sensitivity diaphragm detects minute changes in differential pressure for consistent performance.
Common Questions
- How can I tell if my Lennox pressure switch is failing? If your furnace sequence stops after the inducer starts but before ignition, use a manometer to verify if the 1.6" WC threshold is being met. If the pressure is correct but the circuit remains open, the Lennox 51M87 requires replacement.
- Can I use a universal pressure switch instead of the 51M87? While some adjustable switches exist, using the specific OEM Lennox pressure switch is recommended to ensure the safety parameters and mounting geometry match the original equipment design.
- Is the 51M8701 the same as the 51M87? Yes, these part numbers are functionally and physically identical and can be used interchangeably in all specified Lennox models.
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: $203.69
-65%$203.69
$71.29Lennox 51M87 Pressure Switch
The Lennox 51M87 is a precision-engineered furnace pressure switch designed for critical venting safety within Lennox HVAC systems. This 1.6" WC SPDT N.O. pressure switch functions as a fail-safe, ensuring the inducer motor is generating adequate static pressure before allowing the ignition sequence to proceed. The 51M8701 is the identical direct replacement, maintaining the exact factory set point of 1.60 inches of water column. As a Single Pole Double Throw (SPDT) component with a Normally Open (N.O.) configuration, it integrates seamlessly with the control board to monitor for blocked flues or failed draft inducer blowers. For contractors performing Lennox furnace repair, this part is essential for resolving pressure switch stuck open codes and restoring reliable combustion air validation. Its robust construction ensures durability against the thermal cycling and vibration common in residential heating applications.
Key Benefits
- OEM Compatibility: Precision-calibrated 1.6" WC set point ensures exact matching with Lennox furnace parts specifications.
- Direct Replacement: Fully interchangeable with Lennox 51M8701, simplifying inventory and field installation.
- Reliable Safety Integration: SPDT N.O. circuitry prevents burner operation during hazardous venting conditions.
- Rugged Design: Built to withstand the high-demand environments of HVAC draft inducer assemblies.
- Accurate Sensing: High-sensitivity diaphragm detects minute changes in differential pressure for consistent performance.
Common Questions
- How can I tell if my Lennox pressure switch is failing? If your furnace sequence stops after the inducer starts but before ignition, use a manometer to verify if the 1.6" WC threshold is being met. If the pressure is correct but the circuit remains open, the Lennox 51M87 requires replacement.
- Can I use a universal pressure switch instead of the 51M87? While some adjustable switches exist, using the specific OEM Lennox pressure switch is recommended to ensure the safety parameters and mounting geometry match the original equipment design.
- Is the 51M8701 the same as the 51M87? Yes, these part numbers are functionally and physically identical and can be used interchangeably in all specified Lennox models.
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 51M87 is a precision-engineered furnace pressure switch designed for critical venting safety within Lennox HVAC systems. This 1.6" WC SPDT N.O. pressure switch functions as a fail-safe, ensuring the inducer motor is generating adequate static pressure before allowing the ignition sequence to proceed. The 51M8701 is the identical direct replacement, maintaining the exact factory set point of 1.60 inches of water column. As a Single Pole Double Throw (SPDT) component with a Normally Open (N.O.) configuration, it integrates seamlessly with the control board to monitor for blocked flues or failed draft inducer blowers. For contractors performing Lennox furnace repair, this part is essential for resolving pressure switch stuck open codes and restoring reliable combustion air validation. Its robust construction ensures durability against the thermal cycling and vibration common in residential heating applications.
Key Benefits
- OEM Compatibility: Precision-calibrated 1.6" WC set point ensures exact matching with Lennox furnace parts specifications.
- Direct Replacement: Fully interchangeable with Lennox 51M8701, simplifying inventory and field installation.
- Reliable Safety Integration: SPDT N.O. circuitry prevents burner operation during hazardous venting conditions.
- Rugged Design: Built to withstand the high-demand environments of HVAC draft inducer assemblies.
- Accurate Sensing: High-sensitivity diaphragm detects minute changes in differential pressure for consistent performance.
Common Questions
- How can I tell if my Lennox pressure switch is failing? If your furnace sequence stops after the inducer starts but before ignition, use a manometer to verify if the 1.6" WC threshold is being met. If the pressure is correct but the circuit remains open, the Lennox 51M87 requires replacement.
- Can I use a universal pressure switch instead of the 51M87? While some adjustable switches exist, using the specific OEM Lennox pressure switch is recommended to ensure the safety parameters and mounting geometry match the original equipment design.
- Is the 51M8701 the same as the 51M87? Yes, these part numbers are functionally and physically identical and can be used interchangeably in all specified Lennox models.
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.
