Lennox 14A51 Pressure Switch
Engineered as a high-precision safety and sequencing component, the Lennox 14A51 Pressure Switch provides critical draft verification for two-stage gas furnaces. This OEM sensor features a factory-calibrated set point high of 0.74" W.C. and a set point low of -0.41" W.C., ensuring the inducer motor maintains the exact static pressure required for safe combustion. Built to withstand the harsh vibration and thermal cycles of an 80% to 95% efficiency cabinet, the 14A51 utilizes a robust internal diaphragm and SPST-NO (Single Pole Single Throw, Normally Open) contacts rated at 5 Amps. For technicians troubleshooting a Lennox furnace pressure switch open error, this unit serves as a direct replacement for legacy part numbers 104549-09, 103613-09, and 93W85. Proper integration into the control circuit prevents ignition if venting is obstructed or the inducer fails, maintaining strict system integrity across the heating cycle.
Key Benefits- Dual-Stage Calibration: Precise set points at .74" and -.41" WC specifically tuned for Lennox HVAC systems.
- OEM Compatibility: Replaces multiple legacy Lennox furnace parts, ensuring an exact fit without bracket modification.
- Industrial Durability: Rugged diaphragm construction prevents premature failure caused by vibration or moisture within the combustion air pressure switch.
- Enhanced Safety: High-load 5 Amp contacts provide reliable switching under heavy 24VAC electrical loads.
What causes a Lennox 14A51 switch to stay open while the inducer is running?
This typically indicates a restriction in the venting, a clogged condensate drain, or a cracked vacuum hose. Before replacing the switch, verify the pressure switch hose is clear of debris and the inducer is reaching the required RPM.
Can I use a universal pressure switch instead of the 14A51?
While universal options exist, the specific .74/-.41 pressure switch calibration of the 14A51 is critical for the safety timing of two-stage Lennox boards. Using an incorrect WC rating can lead to intermittent "failure to ignite" codes or unsafe operating conditions.
How do I test the continuity of this switch?
With the power off and the inducer stopped, the switch should be open (no continuity). Once the inducer creates a vacuum exceeding the set point, the contacts should close. A multimeter reading across the terminals during the start-up sequence will confirm mechanical operation.
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: $58.08
-65%$58.08
$20.33Lennox 14A51 Pressure Switch
Engineered as a high-precision safety and sequencing component, the Lennox 14A51 Pressure Switch provides critical draft verification for two-stage gas furnaces. This OEM sensor features a factory-calibrated set point high of 0.74" W.C. and a set point low of -0.41" W.C., ensuring the inducer motor maintains the exact static pressure required for safe combustion. Built to withstand the harsh vibration and thermal cycles of an 80% to 95% efficiency cabinet, the 14A51 utilizes a robust internal diaphragm and SPST-NO (Single Pole Single Throw, Normally Open) contacts rated at 5 Amps. For technicians troubleshooting a Lennox furnace pressure switch open error, this unit serves as a direct replacement for legacy part numbers 104549-09, 103613-09, and 93W85. Proper integration into the control circuit prevents ignition if venting is obstructed or the inducer fails, maintaining strict system integrity across the heating cycle.
Key Benefits- Dual-Stage Calibration: Precise set points at .74" and -.41" WC specifically tuned for Lennox HVAC systems.
- OEM Compatibility: Replaces multiple legacy Lennox furnace parts, ensuring an exact fit without bracket modification.
- Industrial Durability: Rugged diaphragm construction prevents premature failure caused by vibration or moisture within the combustion air pressure switch.
- Enhanced Safety: High-load 5 Amp contacts provide reliable switching under heavy 24VAC electrical loads.
What causes a Lennox 14A51 switch to stay open while the inducer is running?
This typically indicates a restriction in the venting, a clogged condensate drain, or a cracked vacuum hose. Before replacing the switch, verify the pressure switch hose is clear of debris and the inducer is reaching the required RPM.
Can I use a universal pressure switch instead of the 14A51?
While universal options exist, the specific .74/-.41 pressure switch calibration of the 14A51 is critical for the safety timing of two-stage Lennox boards. Using an incorrect WC rating can lead to intermittent "failure to ignite" codes or unsafe operating conditions.
How do I test the continuity of this switch?
With the power off and the inducer stopped, the switch should be open (no continuity). Once the inducer creates a vacuum exceeding the set point, the contacts should close. A multimeter reading across the terminals during the start-up sequence will confirm mechanical operation.
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
Engineered as a high-precision safety and sequencing component, the Lennox 14A51 Pressure Switch provides critical draft verification for two-stage gas furnaces. This OEM sensor features a factory-calibrated set point high of 0.74" W.C. and a set point low of -0.41" W.C., ensuring the inducer motor maintains the exact static pressure required for safe combustion. Built to withstand the harsh vibration and thermal cycles of an 80% to 95% efficiency cabinet, the 14A51 utilizes a robust internal diaphragm and SPST-NO (Single Pole Single Throw, Normally Open) contacts rated at 5 Amps. For technicians troubleshooting a Lennox furnace pressure switch open error, this unit serves as a direct replacement for legacy part numbers 104549-09, 103613-09, and 93W85. Proper integration into the control circuit prevents ignition if venting is obstructed or the inducer fails, maintaining strict system integrity across the heating cycle.
Key Benefits- Dual-Stage Calibration: Precise set points at .74" and -.41" WC specifically tuned for Lennox HVAC systems.
- OEM Compatibility: Replaces multiple legacy Lennox furnace parts, ensuring an exact fit without bracket modification.
- Industrial Durability: Rugged diaphragm construction prevents premature failure caused by vibration or moisture within the combustion air pressure switch.
- Enhanced Safety: High-load 5 Amp contacts provide reliable switching under heavy 24VAC electrical loads.
What causes a Lennox 14A51 switch to stay open while the inducer is running?
This typically indicates a restriction in the venting, a clogged condensate drain, or a cracked vacuum hose. Before replacing the switch, verify the pressure switch hose is clear of debris and the inducer is reaching the required RPM.
Can I use a universal pressure switch instead of the 14A51?
While universal options exist, the specific .74/-.41 pressure switch calibration of the 14A51 is critical for the safety timing of two-stage Lennox boards. Using an incorrect WC rating can lead to intermittent "failure to ignite" codes or unsafe operating conditions.
How do I test the continuity of this switch?
With the power off and the inducer stopped, the switch should be open (no continuity). Once the inducer creates a vacuum exceeding the set point, the contacts should close. A multimeter reading across the terminals during the start-up sequence will confirm mechanical operation.
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.
