Reznor 196290 Enthalpy Sensor for HVAC Economizer Systems

The Reznor 196290 is a solid-state enthalpy sensor designed for use in Reznor commercial and industrial HVAC equipment, including CAUA, ACUB, ACUA, and ACUC series units. This sensor utilizes Honeywell C7400A-1004 technology to measure both temperature and humidity, providing critical data for economizer control systems that optimize energy efficiency by managing outdoor and return air dampers.

Key Features:

• Solid-state design measures enthalpy (combined temperature and humidity)
• 4-20 mA current output signal that increases as enthalpy decreases
• Can be mounted in any position up to 200 feet from the economizer logic module
• Wide operating temperature range: -40°F to 125°F (-40°C to 66°C)
• Thermistor-based temperature sensing element
• Low power consumption: 0.45 VA maximum
• Operating humidity range: 10% to 90% relative humidity
• Compact duct-mount design with UL94-5V rated enclosure

This OEM replacement sensor is essential for maintaining optimal performance in Reznor economizer systems. Use as a single sensor in outdoor air for basic control, or deploy two sensors (one in return air, one in outdoor air) for differential control that maximizes energy savings. The sensor connects via two 1/4-inch quick-connect terminals and must be installed where it is exposed to freely circulating air for accurate readings.