Lennox 78M19 Supply Air Sensor
The Lennox 78M19 Supply Air Sensor (alternative part C0SNSR20AE1) is an essential component for maintaining precision discharge air control in high-performance HVAC systems. Designed for integration with Lennox Prodigy Unit Controllers and CORE Control Systems, this supply static differential pressure sensor provides the critical feedback needed for Constant Air Volume Bypass (CAVB) and Variable Air Volume (VAV) applications. Whether you are servicing Lennox Landmark rooftop units or complex split systems, this sensor ensures the HVAC control board receives accurate analog input to regulate airflow tracking and optimize indoor air quality (IAQ).
For veteran technicians, the 78M19 offers field-adjustable flexibility with three selectable operating ranges and three output options (including 0-10VDC and 4-20mA) via onboard mini-jumpers. This NIST-traceable sensor is built for the rigors of mechanical rooms, featuring conformal coated circuit boards to resist environmental degradation. When troubleshooting communication failure or incorrect temperature readings, checking the sensor resistance against the Lennox temperature-resistance chart is a standard diagnostic step to ensure the discharge air temperature remains within the 40°F to 95°F compensated range.
Key Benefits for the Contractor- Universal Controller Compatibility: Seamlessly interfaces with Prodigy, CORE, and L Connection Network systems.
- Field-Adjustable Jumper Settings: Allows for quick configuration of static pressure ranges (factory-set at 0-5.0 in. w.c.) to match specific duct requirements.
- Enhanced System Efficiency: Enables discharge air control (DAC) mode, preventing short cycling and improving energy management.
- Durable Construction: Built with NTC thermistor technology and precision calibration for long-term stability in commercial environments.
How do I verify if a Lennox 78M19 sensor is faulty?
Technicians should isolate the sensor and measure the DC voltage output or check continuity and resistance. If the thermostat alert code 31 or 225 appears, inspect the yellow COMM cables and 24VAC power supply for loose wiring or electrical interference.
Where is the best mounting location for this supply air sensor?
For zoning applications, the sensor probe should typically be inserted into the supply air plenum or the longest run of the supply duct, ideally after a 90-degree turn to ensure a representative airflow sample.
Can this replace a standard 88K38 discharge air sensor?
While both monitor air, the 78M19 is specifically a static differential pressure sensor. Always check the unit controller compatibility and required VDC output before substituting HVAC sensors.
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: $466.86
-65%$466.86
$163.40Lennox 78M19 Supply Air Sensor
The Lennox 78M19 Supply Air Sensor (alternative part C0SNSR20AE1) is an essential component for maintaining precision discharge air control in high-performance HVAC systems. Designed for integration with Lennox Prodigy Unit Controllers and CORE Control Systems, this supply static differential pressure sensor provides the critical feedback needed for Constant Air Volume Bypass (CAVB) and Variable Air Volume (VAV) applications. Whether you are servicing Lennox Landmark rooftop units or complex split systems, this sensor ensures the HVAC control board receives accurate analog input to regulate airflow tracking and optimize indoor air quality (IAQ).
For veteran technicians, the 78M19 offers field-adjustable flexibility with three selectable operating ranges and three output options (including 0-10VDC and 4-20mA) via onboard mini-jumpers. This NIST-traceable sensor is built for the rigors of mechanical rooms, featuring conformal coated circuit boards to resist environmental degradation. When troubleshooting communication failure or incorrect temperature readings, checking the sensor resistance against the Lennox temperature-resistance chart is a standard diagnostic step to ensure the discharge air temperature remains within the 40°F to 95°F compensated range.
Key Benefits for the Contractor- Universal Controller Compatibility: Seamlessly interfaces with Prodigy, CORE, and L Connection Network systems.
- Field-Adjustable Jumper Settings: Allows for quick configuration of static pressure ranges (factory-set at 0-5.0 in. w.c.) to match specific duct requirements.
- Enhanced System Efficiency: Enables discharge air control (DAC) mode, preventing short cycling and improving energy management.
- Durable Construction: Built with NTC thermistor technology and precision calibration for long-term stability in commercial environments.
How do I verify if a Lennox 78M19 sensor is faulty?
Technicians should isolate the sensor and measure the DC voltage output or check continuity and resistance. If the thermostat alert code 31 or 225 appears, inspect the yellow COMM cables and 24VAC power supply for loose wiring or electrical interference.
Where is the best mounting location for this supply air sensor?
For zoning applications, the sensor probe should typically be inserted into the supply air plenum or the longest run of the supply duct, ideally after a 90-degree turn to ensure a representative airflow sample.
Can this replace a standard 88K38 discharge air sensor?
While both monitor air, the 78M19 is specifically a static differential pressure sensor. Always check the unit controller compatibility and required VDC output before substituting HVAC sensors.
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 78M19 Supply Air Sensor (alternative part C0SNSR20AE1) is an essential component for maintaining precision discharge air control in high-performance HVAC systems. Designed for integration with Lennox Prodigy Unit Controllers and CORE Control Systems, this supply static differential pressure sensor provides the critical feedback needed for Constant Air Volume Bypass (CAVB) and Variable Air Volume (VAV) applications. Whether you are servicing Lennox Landmark rooftop units or complex split systems, this sensor ensures the HVAC control board receives accurate analog input to regulate airflow tracking and optimize indoor air quality (IAQ).
For veteran technicians, the 78M19 offers field-adjustable flexibility with three selectable operating ranges and three output options (including 0-10VDC and 4-20mA) via onboard mini-jumpers. This NIST-traceable sensor is built for the rigors of mechanical rooms, featuring conformal coated circuit boards to resist environmental degradation. When troubleshooting communication failure or incorrect temperature readings, checking the sensor resistance against the Lennox temperature-resistance chart is a standard diagnostic step to ensure the discharge air temperature remains within the 40°F to 95°F compensated range.
Key Benefits for the Contractor- Universal Controller Compatibility: Seamlessly interfaces with Prodigy, CORE, and L Connection Network systems.
- Field-Adjustable Jumper Settings: Allows for quick configuration of static pressure ranges (factory-set at 0-5.0 in. w.c.) to match specific duct requirements.
- Enhanced System Efficiency: Enables discharge air control (DAC) mode, preventing short cycling and improving energy management.
- Durable Construction: Built with NTC thermistor technology and precision calibration for long-term stability in commercial environments.
How do I verify if a Lennox 78M19 sensor is faulty?
Technicians should isolate the sensor and measure the DC voltage output or check continuity and resistance. If the thermostat alert code 31 or 225 appears, inspect the yellow COMM cables and 24VAC power supply for loose wiring or electrical interference.
Where is the best mounting location for this supply air sensor?
For zoning applications, the sensor probe should typically be inserted into the supply air plenum or the longest run of the supply duct, ideally after a 90-degree turn to ensure a representative airflow sample.
Can this replace a standard 88K38 discharge air sensor?
While both monitor air, the 78M19 is specifically a static differential pressure sensor. Always check the unit controller compatibility and required VDC output before substituting HVAC sensors.
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.
