Lennox 12L20 Pressure Switch
The Lennox 12L20 Pressure Switch is a critical OEM HVAC safety control designed to protect the compressor and refrigeration circuit from catastrophic failure. As a 590 PSI high pressure switch, it operates on a Normally Closed (N/C) logic, meaning the internal contacts are closed during standard operation and snap open to kill the control circuit when discharge pressure exceeds the factory setpoint. This Lennox replacement part ensures the system remains within safe operating envelopes, particularly in high-tonnage commercial HVAC and residential air conditioning units using R-410A refrigerant. Built to exact factory specifications, the 12L20 pressure cutout eliminates the guesswork of universal aftermarket parts, maintaining the integrity of the original system design. For technicians troubleshooting high-head pressure issues, swapping in this calibrated Lennox high pressure switch is the standard procedure to restore safety cut-out functionality and prevent motor burnout.
Technical Benefits for Professionals:
- Precision Calibration: Factory-set to trip at 590 PSI, preventing liquid slugging and excessive discharge temperatures.
- Reliable N/C Operation: Features Normally Closed contacts that provide a fail-safe break in the 24V or 120V control loop upon high-pressure detection.
- Direct OEM Fitment: The Lennox 12L20 eliminates the need for field-brazing or adapter fittings often required with generic components.
- System Longevity: Provides automated high pressure protection, shielding the compressor from mechanical stress during condenser fan failure or coil blockage.
Common HVAC Contractor Questions:
What is the reset logic for the 12L20 switch?
This Lennox high pressure switch is typically an automatic reset component that re-closes the circuit once the system pressure drops below the reset differential, though it should always be inspected for debris or non-condensables causing the trip.
Is this switch compatible with R-410A systems?
Yes, the 590 PSI rating is specifically engineered for the higher operating pressures of R-410A equipment, serving as the primary refrigerant pressure safety limit.
Can I use this to replace a different brand's high pressure cutout?
While the 12L20 is a Lennox OEM part, its 590 PSI N/C specifications may match other applications; however, confirming the thread size and electrical terminal configuration is essential for field installation.
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: $32.31
-65%$32.31
$11.31Lennox 12L20 Pressure Switch
The Lennox 12L20 Pressure Switch is a critical OEM HVAC safety control designed to protect the compressor and refrigeration circuit from catastrophic failure. As a 590 PSI high pressure switch, it operates on a Normally Closed (N/C) logic, meaning the internal contacts are closed during standard operation and snap open to kill the control circuit when discharge pressure exceeds the factory setpoint. This Lennox replacement part ensures the system remains within safe operating envelopes, particularly in high-tonnage commercial HVAC and residential air conditioning units using R-410A refrigerant. Built to exact factory specifications, the 12L20 pressure cutout eliminates the guesswork of universal aftermarket parts, maintaining the integrity of the original system design. For technicians troubleshooting high-head pressure issues, swapping in this calibrated Lennox high pressure switch is the standard procedure to restore safety cut-out functionality and prevent motor burnout.
Technical Benefits for Professionals:
- Precision Calibration: Factory-set to trip at 590 PSI, preventing liquid slugging and excessive discharge temperatures.
- Reliable N/C Operation: Features Normally Closed contacts that provide a fail-safe break in the 24V or 120V control loop upon high-pressure detection.
- Direct OEM Fitment: The Lennox 12L20 eliminates the need for field-brazing or adapter fittings often required with generic components.
- System Longevity: Provides automated high pressure protection, shielding the compressor from mechanical stress during condenser fan failure or coil blockage.
Common HVAC Contractor Questions:
What is the reset logic for the 12L20 switch?
This Lennox high pressure switch is typically an automatic reset component that re-closes the circuit once the system pressure drops below the reset differential, though it should always be inspected for debris or non-condensables causing the trip.
Is this switch compatible with R-410A systems?
Yes, the 590 PSI rating is specifically engineered for the higher operating pressures of R-410A equipment, serving as the primary refrigerant pressure safety limit.
Can I use this to replace a different brand's high pressure cutout?
While the 12L20 is a Lennox OEM part, its 590 PSI N/C specifications may match other applications; however, confirming the thread size and electrical terminal configuration is essential for field installation.
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 12L20 Pressure Switch is a critical OEM HVAC safety control designed to protect the compressor and refrigeration circuit from catastrophic failure. As a 590 PSI high pressure switch, it operates on a Normally Closed (N/C) logic, meaning the internal contacts are closed during standard operation and snap open to kill the control circuit when discharge pressure exceeds the factory setpoint. This Lennox replacement part ensures the system remains within safe operating envelopes, particularly in high-tonnage commercial HVAC and residential air conditioning units using R-410A refrigerant. Built to exact factory specifications, the 12L20 pressure cutout eliminates the guesswork of universal aftermarket parts, maintaining the integrity of the original system design. For technicians troubleshooting high-head pressure issues, swapping in this calibrated Lennox high pressure switch is the standard procedure to restore safety cut-out functionality and prevent motor burnout.
Technical Benefits for Professionals:
- Precision Calibration: Factory-set to trip at 590 PSI, preventing liquid slugging and excessive discharge temperatures.
- Reliable N/C Operation: Features Normally Closed contacts that provide a fail-safe break in the 24V or 120V control loop upon high-pressure detection.
- Direct OEM Fitment: The Lennox 12L20 eliminates the need for field-brazing or adapter fittings often required with generic components.
- System Longevity: Provides automated high pressure protection, shielding the compressor from mechanical stress during condenser fan failure or coil blockage.
Common HVAC Contractor Questions:
What is the reset logic for the 12L20 switch?
This Lennox high pressure switch is typically an automatic reset component that re-closes the circuit once the system pressure drops below the reset differential, though it should always be inspected for debris or non-condensables causing the trip.
Is this switch compatible with R-410A systems?
Yes, the 590 PSI rating is specifically engineered for the higher operating pressures of R-410A equipment, serving as the primary refrigerant pressure safety limit.
Can I use this to replace a different brand's high pressure cutout?
While the 12L20 is a Lennox OEM part, its 590 PSI N/C specifications may match other applications; however, confirming the thread size and electrical terminal configuration is essential for field installation.
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.
