Aaon V14640 Solid State Enthalpy Sensor C7400A for HVAC Economizer Systems

The Aaon V14640 is an OEM solid state enthalpy sensor utilizing the Honeywell C7400A platform, designed for use in AAON HVAC rooftop units and compatible economizer systems. This sensor simultaneously measures outdoor air temperature and relative humidity to calculate enthalpy, enabling the economizer logic module to intelligently modulate outdoor and return air dampers for energy-efficient free cooling.

The sensor outputs a 4–20 mA analog signal — increasing from 4 mA to 20 mA as enthalpy decreases — allowing precise, real-time control by compatible economizer logic modules. It is compatible with economizer logic modules using A, B, C, and D performance curves.

Key Features:

• Solid state design senses both temperature and humidity with 5% accuracy
• 4–20 mA output signal inversely proportional to enthalpy for direct logic module integration
• Operating temperature range: -40°F to 150°F (-40°C to 65.6°C)
• Operating humidity range: 10% to 90% relative humidity
• Supply voltage: 12 to 40 Vdc
• Maximum power consumption: 0.8 VA
• Electrical connections: Two 1/4 in. (6 mm) quick-connect terminals
• Compatible with W7210, W7212, W7213, W7214, W7215, W7340, and W7459 economizer logic modules
• Can be mounted up to 200 ft (61 m) away from the economizer logic module
• Rugged, corrosion-resistant glass-fiber reinforced plastic enclosure — UL94-5V flammability rating
• Compact, lightweight construction for easy installation in HVAC rooftop units

For maximum energy savings and differential enthalpy changeover control, two C7400A sensors can be used simultaneously — one mounted in the outdoor air intake and one in the return air stream. When outdoor air enthalpy is favorable, the damper opens to reduce the mechanical cooling load. When outdoor enthalpy rises, the damper closes to maintain indoor comfort efficiently.