Carrier HH57AC078 Enthalpy Sensor

Ensure your commercial HVAC systems operate with maximum efficiency using the Carrier HH57AC078 Enthalpy Sensor. This solid-state OEM replacement part is essential for managing economizer control by accurately measuring both relative humidity and temperature. This dual-sensing capability allows the system to calculate total heat content (enthalpy), enabling smart decisions between utilizing outdoor air or mechanical cooling to maintain setpoint conditions.

Designed for seamless integration with EconoMi$er IV controllers, this sensor is a direct replacement for Honeywell C7400A1046. It provides a reliable 4-20 mA output signal that increases as enthalpy decreases, providing the precise feedback required for building automation. The compact, duct-mount design and 1/4-inch quick-connect terminals ensure a professional installation in a variety of Carrier, Bryant, and Payne rooftop units. By implementing this HVAC enthalpy sensor, technicians can significantly improve indoor air quality (IAQ) while reducing compressor wear and overall energy consumption in demanding industrial or commercial environments.

• Precise Enthalpy Monitoring: Combines thermistor-based temperature sensing with advanced humidity detection for total air energy assessment.
• Optimized Free Cooling: Facilitates accurate economizer changeover to leverage outdoor air, reducing operational costs.
• High Compatibility: Direct fit for numerous Carrier rooftop models and EconoMi$er IV systems.
• Durable Construction: Engineered to withstand ambient temperatures ranging from 30°F to 125°F within 10% to 90% RH environments.

• How does the HH57AC078 improve system efficiency? It monitors total outdoor air energy, preventing the economizer from bringing in high-humidity air that would otherwise increase the latent cooling load.
• Can this be used for differential enthalpy control? Yes, when paired with the CRENTDIF004A00 return air sensor, the system can compare outdoor and return air to select the most efficient cooling source.
• What is the typical wiring configuration? The sensor utilizes a two-wire connection (Red to SO and Black to SO+) to interface directly with the economizer controller.

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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.