Lennox 29W64 Switch
The Lennox 29W64 Pressure Switch is a critical safety component designed for two-stage gas furnaces, engineered to monitor pressure differentials within the inducer system. This SPST (Single Pole Single Throw), normally open switch is calibrated to trip at 0.90/1.30" WC, ensuring precise venting and combustion safety protocols are met before the ignition sequence proceeds. Built to withstand high-cycle operations in residential HVAC environments, the 29W64 serves as a direct replacement for failing furnace air pressure switches that cause "limit circuit open" faults or ignition failure codes. Its robust diaphragm design manages fluctuations in the combustion air blower performance, providing reliable HVAC pressure sensing to prevent the operation of the burner under restricted venting or obstructed flue conditions. When diagnosing furnace pressure switch failure, this genuine Lennox replacement part ensures the system maintains OEM specifications for air-to-fuel ratios and operational efficiency.
Commonly Cited Specifications:
- Compatible with specific Lennox G61MPV and SLP98 furnace series.
- Dual-stage switching logic calibrated for 0.90 to 1.30 inches Water Column.
- SPST N.O. configuration prevents premature burner engagement.
- Direct fitment for combustion air pressure monitoring in multi-stage heating systems.
- Constructed with high-heat resistant materials for longevity near the draft inducer housing.
Frequently Asked Questions:
How do I diagnose a faulty Lennox 29W64 switch?
Technicians should use a manometer to verify the inducer is pulling at least 1.30" WC. If the pressure is sufficient but the SPST switch contacts remain open, the diaphragm or internal spring has likely failed, requiring a replacement.
Can this pressure switch be used on single-stage furnaces?
No, this is a 2-stage pressure switch specifically calibrated for the variable static pressures found in multi-stage furnaces. Using this on a single-stage unit will result in improper sequencing and safety lockouts.
What causes these switches to fail prematurely?
Moisture accumulation in the sensing lines or cracked tubing are the primary causes. Ensure the pressure switch tubing is clear of obstructions and the collector box is draining correctly when installing the new 29W64.
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: $55.01
-65%$55.01
$19.25Lennox 29W64 Switch
The Lennox 29W64 Pressure Switch is a critical safety component designed for two-stage gas furnaces, engineered to monitor pressure differentials within the inducer system. This SPST (Single Pole Single Throw), normally open switch is calibrated to trip at 0.90/1.30" WC, ensuring precise venting and combustion safety protocols are met before the ignition sequence proceeds. Built to withstand high-cycle operations in residential HVAC environments, the 29W64 serves as a direct replacement for failing furnace air pressure switches that cause "limit circuit open" faults or ignition failure codes. Its robust diaphragm design manages fluctuations in the combustion air blower performance, providing reliable HVAC pressure sensing to prevent the operation of the burner under restricted venting or obstructed flue conditions. When diagnosing furnace pressure switch failure, this genuine Lennox replacement part ensures the system maintains OEM specifications for air-to-fuel ratios and operational efficiency.
Commonly Cited Specifications:
- Compatible with specific Lennox G61MPV and SLP98 furnace series.
- Dual-stage switching logic calibrated for 0.90 to 1.30 inches Water Column.
- SPST N.O. configuration prevents premature burner engagement.
- Direct fitment for combustion air pressure monitoring in multi-stage heating systems.
- Constructed with high-heat resistant materials for longevity near the draft inducer housing.
Frequently Asked Questions:
How do I diagnose a faulty Lennox 29W64 switch?
Technicians should use a manometer to verify the inducer is pulling at least 1.30" WC. If the pressure is sufficient but the SPST switch contacts remain open, the diaphragm or internal spring has likely failed, requiring a replacement.
Can this pressure switch be used on single-stage furnaces?
No, this is a 2-stage pressure switch specifically calibrated for the variable static pressures found in multi-stage furnaces. Using this on a single-stage unit will result in improper sequencing and safety lockouts.
What causes these switches to fail prematurely?
Moisture accumulation in the sensing lines or cracked tubing are the primary causes. Ensure the pressure switch tubing is clear of obstructions and the collector box is draining correctly when installing the new 29W64.
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 29W64 Pressure Switch is a critical safety component designed for two-stage gas furnaces, engineered to monitor pressure differentials within the inducer system. This SPST (Single Pole Single Throw), normally open switch is calibrated to trip at 0.90/1.30" WC, ensuring precise venting and combustion safety protocols are met before the ignition sequence proceeds. Built to withstand high-cycle operations in residential HVAC environments, the 29W64 serves as a direct replacement for failing furnace air pressure switches that cause "limit circuit open" faults or ignition failure codes. Its robust diaphragm design manages fluctuations in the combustion air blower performance, providing reliable HVAC pressure sensing to prevent the operation of the burner under restricted venting or obstructed flue conditions. When diagnosing furnace pressure switch failure, this genuine Lennox replacement part ensures the system maintains OEM specifications for air-to-fuel ratios and operational efficiency.
Commonly Cited Specifications:
- Compatible with specific Lennox G61MPV and SLP98 furnace series.
- Dual-stage switching logic calibrated for 0.90 to 1.30 inches Water Column.
- SPST N.O. configuration prevents premature burner engagement.
- Direct fitment for combustion air pressure monitoring in multi-stage heating systems.
- Constructed with high-heat resistant materials for longevity near the draft inducer housing.
Frequently Asked Questions:
How do I diagnose a faulty Lennox 29W64 switch?
Technicians should use a manometer to verify the inducer is pulling at least 1.30" WC. If the pressure is sufficient but the SPST switch contacts remain open, the diaphragm or internal spring has likely failed, requiring a replacement.
Can this pressure switch be used on single-stage furnaces?
No, this is a 2-stage pressure switch specifically calibrated for the variable static pressures found in multi-stage furnaces. Using this on a single-stage unit will result in improper sequencing and safety lockouts.
What causes these switches to fail prematurely?
Moisture accumulation in the sensing lines or cracked tubing are the primary causes. Ensure the pressure switch tubing is clear of obstructions and the collector box is draining correctly when installing the new 29W64.
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.
