Lennox 11U70 Pressure Switch
The Lennox 11U70 Pressure Switch is a critical safety component engineered to monitor and regulate internal air pressure within high-performance HVAC systems. This .80 pressure switch (Catalog No. 11U70, Part No. 104371-07) is a single-pole, single-throw (SPST-N.O.) contact rated for 5 Amp resistive at 24 VAC. Tasked with sensing the draft created by the inducer motor, it ensures the combustion process only initiates under safe airflow conditions. As a Lennox OEM replacement part, it offers precise actuation at 0.80 inches of water column, providing a direct fit for compatible Lennox furnace models. For contractors troubleshooting ignition failure or short-cycling units, this switch is the reliable solution for addressing pressure switch open fault codes. Its robust diaphragm and precision-calibrated set point prevent system operation during flue blockages or intake restrictions, maintaining the operational integrity of the heating assembly. Verify the water column rating on the existing switch before installation to ensure exact performance matching.
Key Benefits- Precision-calibrated 0.80" WC actuation set point for accurate draft sensing.
- OEM Lennox 11u70 specification ensures seamless electrical and physical integration.
- SPST-Normally Open contact configuration rated for standard 24V control circuits.
- Heavy-duty construction designed to withstand the thermal cycles of residential and industrial furnace environments.
- Eliminates intermittent "pressure switch stuck open" errors caused by fatigued mechanical diaphragms.
How do I troubleshoot a Lennox furnace pressure switch open error?
Start by inspecting the vacuum tubing for cracks, moisture, or insect debris. Ensure the inducer motor is reaching full RPM and the flue pipe is free of obstructions. If the inducer creates sufficient draft but the Lennox 11U70 fails to close, the internal diaphragm or contact is likely defective.
Can I use a higher WC rated switch as a substitute?
No. Pressure switches are safety devices calibrated to specific blower and venting requirements. Installing a switch with a different water column rating can lead to unsafe combustion or frequent nuisance tripping. Always match the 11U70 .80 pressure switch rating exactly.
Why is there water in my pressure switch hose?
Moisture accumulation often points to a clogged condensate drain or improper venting pitch in high-efficiency units. This moisture can prevent the switch from sensing pressure correctly, requiring the system to be drained and the blockage cleared before replacing the component.
This item is not eligible for free shipping.
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: $30.88
-65%$30.88
$10.81Lennox 11U70 Pressure Switch
The Lennox 11U70 Pressure Switch is a critical safety component engineered to monitor and regulate internal air pressure within high-performance HVAC systems. This .80 pressure switch (Catalog No. 11U70, Part No. 104371-07) is a single-pole, single-throw (SPST-N.O.) contact rated for 5 Amp resistive at 24 VAC. Tasked with sensing the draft created by the inducer motor, it ensures the combustion process only initiates under safe airflow conditions. As a Lennox OEM replacement part, it offers precise actuation at 0.80 inches of water column, providing a direct fit for compatible Lennox furnace models. For contractors troubleshooting ignition failure or short-cycling units, this switch is the reliable solution for addressing pressure switch open fault codes. Its robust diaphragm and precision-calibrated set point prevent system operation during flue blockages or intake restrictions, maintaining the operational integrity of the heating assembly. Verify the water column rating on the existing switch before installation to ensure exact performance matching.
Key Benefits- Precision-calibrated 0.80" WC actuation set point for accurate draft sensing.
- OEM Lennox 11u70 specification ensures seamless electrical and physical integration.
- SPST-Normally Open contact configuration rated for standard 24V control circuits.
- Heavy-duty construction designed to withstand the thermal cycles of residential and industrial furnace environments.
- Eliminates intermittent "pressure switch stuck open" errors caused by fatigued mechanical diaphragms.
How do I troubleshoot a Lennox furnace pressure switch open error?
Start by inspecting the vacuum tubing for cracks, moisture, or insect debris. Ensure the inducer motor is reaching full RPM and the flue pipe is free of obstructions. If the inducer creates sufficient draft but the Lennox 11U70 fails to close, the internal diaphragm or contact is likely defective.
Can I use a higher WC rated switch as a substitute?
No. Pressure switches are safety devices calibrated to specific blower and venting requirements. Installing a switch with a different water column rating can lead to unsafe combustion or frequent nuisance tripping. Always match the 11U70 .80 pressure switch rating exactly.
Why is there water in my pressure switch hose?
Moisture accumulation often points to a clogged condensate drain or improper venting pitch in high-efficiency units. This moisture can prevent the switch from sensing pressure correctly, requiring the system to be drained and the blockage cleared before replacing the component.
This item is not eligible for free shipping.
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 11U70 Pressure Switch is a critical safety component engineered to monitor and regulate internal air pressure within high-performance HVAC systems. This .80 pressure switch (Catalog No. 11U70, Part No. 104371-07) is a single-pole, single-throw (SPST-N.O.) contact rated for 5 Amp resistive at 24 VAC. Tasked with sensing the draft created by the inducer motor, it ensures the combustion process only initiates under safe airflow conditions. As a Lennox OEM replacement part, it offers precise actuation at 0.80 inches of water column, providing a direct fit for compatible Lennox furnace models. For contractors troubleshooting ignition failure or short-cycling units, this switch is the reliable solution for addressing pressure switch open fault codes. Its robust diaphragm and precision-calibrated set point prevent system operation during flue blockages or intake restrictions, maintaining the operational integrity of the heating assembly. Verify the water column rating on the existing switch before installation to ensure exact performance matching.
Key Benefits- Precision-calibrated 0.80" WC actuation set point for accurate draft sensing.
- OEM Lennox 11u70 specification ensures seamless electrical and physical integration.
- SPST-Normally Open contact configuration rated for standard 24V control circuits.
- Heavy-duty construction designed to withstand the thermal cycles of residential and industrial furnace environments.
- Eliminates intermittent "pressure switch stuck open" errors caused by fatigued mechanical diaphragms.
How do I troubleshoot a Lennox furnace pressure switch open error?
Start by inspecting the vacuum tubing for cracks, moisture, or insect debris. Ensure the inducer motor is reaching full RPM and the flue pipe is free of obstructions. If the inducer creates sufficient draft but the Lennox 11U70 fails to close, the internal diaphragm or contact is likely defective.
Can I use a higher WC rated switch as a substitute?
No. Pressure switches are safety devices calibrated to specific blower and venting requirements. Installing a switch with a different water column rating can lead to unsafe combustion or frequent nuisance tripping. Always match the 11U70 .80 pressure switch rating exactly.
Why is there water in my pressure switch hose?
Moisture accumulation often points to a clogged condensate drain or improper venting pitch in high-efficiency units. This moisture can prevent the switch from sensing pressure correctly, requiring the system to be drained and the blockage cleared before replacing the component.
This item is not eligible for free shipping.
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.
