Lennox 57M67 Pressure Switch

The Lennox 57M67 Pressure Switch is a high-precision OEM component engineered for critical safety monitoring in gas-fired furnaces and HVAC systems. As a veteran technician knows, maintaining the correct pressure threshold is vital for inducer motor verification and combustion safety. This SPST pressure switch is factory-calibrated to actuate at 1.71" WC (water column), ensuring that the exhaust blower is moving sufficient air before the ignition sequence begins. Designed for seamless integration, it features dual 1/4" barb connections for standard pneumatic tubing and easy-to-access electrical terminals for rapid field replacement.

This heavy-duty switch is a direct replacement for Lennox 57M6701 and is compatible with several Lennox and Allied Air platforms, including the AF90 and AF92 series furnaces. Its robust construction ensures reliable performance under fluctuating temperature conditions, preventing nuisance lockouts and ensuring consistent system operation. When diagnosing a pressure switch stuck open or closed error code, utilizing this exact OEM Lennox part is essential for maintaining the factory-specified airflow requirements and proper furnace pressure switch operation without the need for manual adjustment.

Key Benefits:

• Precision calibrated at 1.71" WC to ensure exact safety actuation for Lennox furnaces.
• SPST contact configuration providing reliable circuit interruption or activation based on inducer fan performance.
• Features dual 1/4" barb connections, allowing for standard hose compatibility and straightforward installation.
• OEM construction reduces the risk of incompatible calibration associated with generic HVAC pressure switches.
• Lightweight and durable design specifically engineered for high-cycle residential and commercial heating applications.

Common Questions:

How do I troubleshoot a Lennox pressure switch limit error?
Verify the resistance across the Lennox 57M67 terminals using a multimeter while the inducer is running; if it fails to close at 1.71" WC despite proper vacuum pressure, the switch likely requires replacement.

Is this switch a direct replacement for part 57M6701?
Yes, the 57M67 is the technical catalog equivalent for the 57M6701 model, meeting all original equipment manufacturer specifications for pressure sensitivity and electrical load.

Can I use this pressure switch on a non-Lennox unit?
While this is an OEM Lennox pressure switch, it can be used on other compatible equipment provided the 1.71" WC setpoint and SPST configuration match the manufacturer's technical requirements.

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.