Lennox 11U66 Pressure Switch
The Lennox 11U66 Pressure Switch is a critical safety component designed for precise draft monitoring in high-efficiency gas furnaces and HVAC systems. As a genuine OEM replacement, this 0.55" WC pressure switch is factory-calibrated to actuate at 0.55 inches of water column, ensuring the inducer motor is creating sufficient static pressure before the ignition sequence begins. Built by Cleveland Controls (MPN: 11U66 or 104371-03), this single-pole single-throw (SPST), normally open switch is engineered to withstand the demanding conditions of industrial and residential furnace heat exchangers without premature contact failure.
For contractors, installing a Lennox furnace pressure switch like the 11U66 is essential when troubleshooting E223 error codes or handling intermittent ignition failures. This HVAC draft pressure switch features a durable diaphragm and is rated for a contact load of up to 5 Amps at 24 VAC. Its robust construction prevents safety circuit trips caused by minor fluctuations, while its precise set point ensures maximum system safety. Whether you are performing routine maintenance or a mid-winter emergency repair, choosing this OEM Lennox 11U66 ensures seamless compatibility with existing pneumatic tubing and electrical harnesses.
Key Benefits:- Factory-Calibrated Precision: Actuates at exactly 0.55" W.C. to ensure safe combustion cycles and proper venting.
- OEM Compatibility: Direct replacement for Lennox part 11U66 and Cleveland Controls 104371-03, eliminating the need for field modifications.
- Heavy-Duty Construction: Designed to resist vibration and harsh flue gas environments for long-term reliability.
- Safety Integrity: Prevents furnace operation during vent blockages or inducer motor failure, protecting the heat exchanger.
- What does a 0.55" WC rating mean for this switch? It indicates the specific vacuum or pressure level required to close the internal contacts and allow the furnace to fire.
- Can I use a universal switch instead of the 11U66? It is not recommended. This Lennox 11U66 is specifically calibrated for the static pressure requirements of your furnace's safety circuit.
- How do I troubleshoot a 'Pressure Switch Open' error? Check for obstructed vent pipes, inducer motor performance, or cracked pneumatic tubing before replacing the switch.
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: $24.34
-65%$24.34
$8.52Lennox 11U66 Pressure Switch
The Lennox 11U66 Pressure Switch is a critical safety component designed for precise draft monitoring in high-efficiency gas furnaces and HVAC systems. As a genuine OEM replacement, this 0.55" WC pressure switch is factory-calibrated to actuate at 0.55 inches of water column, ensuring the inducer motor is creating sufficient static pressure before the ignition sequence begins. Built by Cleveland Controls (MPN: 11U66 or 104371-03), this single-pole single-throw (SPST), normally open switch is engineered to withstand the demanding conditions of industrial and residential furnace heat exchangers without premature contact failure.
For contractors, installing a Lennox furnace pressure switch like the 11U66 is essential when troubleshooting E223 error codes or handling intermittent ignition failures. This HVAC draft pressure switch features a durable diaphragm and is rated for a contact load of up to 5 Amps at 24 VAC. Its robust construction prevents safety circuit trips caused by minor fluctuations, while its precise set point ensures maximum system safety. Whether you are performing routine maintenance or a mid-winter emergency repair, choosing this OEM Lennox 11U66 ensures seamless compatibility with existing pneumatic tubing and electrical harnesses.
Key Benefits:- Factory-Calibrated Precision: Actuates at exactly 0.55" W.C. to ensure safe combustion cycles and proper venting.
- OEM Compatibility: Direct replacement for Lennox part 11U66 and Cleveland Controls 104371-03, eliminating the need for field modifications.
- Heavy-Duty Construction: Designed to resist vibration and harsh flue gas environments for long-term reliability.
- Safety Integrity: Prevents furnace operation during vent blockages or inducer motor failure, protecting the heat exchanger.
- What does a 0.55" WC rating mean for this switch? It indicates the specific vacuum or pressure level required to close the internal contacts and allow the furnace to fire.
- Can I use a universal switch instead of the 11U66? It is not recommended. This Lennox 11U66 is specifically calibrated for the static pressure requirements of your furnace's safety circuit.
- How do I troubleshoot a 'Pressure Switch Open' error? Check for obstructed vent pipes, inducer motor performance, or cracked pneumatic tubing before replacing the switch.
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 11U66 Pressure Switch is a critical safety component designed for precise draft monitoring in high-efficiency gas furnaces and HVAC systems. As a genuine OEM replacement, this 0.55" WC pressure switch is factory-calibrated to actuate at 0.55 inches of water column, ensuring the inducer motor is creating sufficient static pressure before the ignition sequence begins. Built by Cleveland Controls (MPN: 11U66 or 104371-03), this single-pole single-throw (SPST), normally open switch is engineered to withstand the demanding conditions of industrial and residential furnace heat exchangers without premature contact failure.
For contractors, installing a Lennox furnace pressure switch like the 11U66 is essential when troubleshooting E223 error codes or handling intermittent ignition failures. This HVAC draft pressure switch features a durable diaphragm and is rated for a contact load of up to 5 Amps at 24 VAC. Its robust construction prevents safety circuit trips caused by minor fluctuations, while its precise set point ensures maximum system safety. Whether you are performing routine maintenance or a mid-winter emergency repair, choosing this OEM Lennox 11U66 ensures seamless compatibility with existing pneumatic tubing and electrical harnesses.
Key Benefits:- Factory-Calibrated Precision: Actuates at exactly 0.55" W.C. to ensure safe combustion cycles and proper venting.
- OEM Compatibility: Direct replacement for Lennox part 11U66 and Cleveland Controls 104371-03, eliminating the need for field modifications.
- Heavy-Duty Construction: Designed to resist vibration and harsh flue gas environments for long-term reliability.
- Safety Integrity: Prevents furnace operation during vent blockages or inducer motor failure, protecting the heat exchanger.
- What does a 0.55" WC rating mean for this switch? It indicates the specific vacuum or pressure level required to close the internal contacts and allow the furnace to fire.
- Can I use a universal switch instead of the 11U66? It is not recommended. This Lennox 11U66 is specifically calibrated for the static pressure requirements of your furnace's safety circuit.
- How do I troubleshoot a 'Pressure Switch Open' error? Check for obstructed vent pipes, inducer motor performance, or cracked pneumatic tubing before replacing the switch.
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.
