Description
The ACI 122440 Enthalpy Changeover Controller is a precision-engineered building automation control designed to maximize HVAC system efficiency by intelligently managing economizer changeover based on outdoor air enthalpy conditions. Operating on a 24VAC power supply, this controller continuously evaluates the heat content of outdoor air — factoring in both temperature and humidity — to determine when free cooling (economizer mode) is appropriate versus when mechanical cooling should take over.
How It Works
Enthalpy-based changeover is a proven strategy for reducing mechanical cooling loads and cutting energy costs. Rather than relying on dry-bulb temperature alone, the ACI 122440 measures the total heat content of outdoor air. When outdoor enthalpy is low enough, the controller signals the system to use outside air for cooling. When outdoor conditions are too warm or humid, it switches to mechanical cooling — preventing the introduction of high-enthalpy air that would increase the cooling burden.
Key Features
- 24VAC operating voltage for compatibility with standard HVAC control systems
- Enthalpy-based changeover logic for superior energy management over dry-bulb-only controls
- Designed for use with economizer systems in commercial and light commercial HVAC applications
- Supports building automation integration for optimized system performance
- Compact, reliable design from ACI (Automation Components Inc), a trusted name in HVAC sensing and control
Applications
- Rooftop unit (RTU) economizer control
- Air handling unit (AHU) free-cooling changeover
- Building automation and energy management systems
- Commercial HVAC installations requiring enthalpy-based outdoor air control
Why Choose Enthalpy Changeover?
Enthalpy changeover controllers like the ACI 122440 outperform simple dry-bulb temperature controllers by accounting for humidity — a critical factor in total cooling load. This results in more accurate free-cooling decisions, reduced compressor runtime, lower energy bills, and improved occupant comfort.
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