Learn HVAC: How does an Air Handling Unit Work (AHU)

Everything you need to know about Air Handling Units (AHU) and how iACS provides tailored controls solutions...
February 10, 2025 by
Learn HVAC: How does an Air Handling Unit Work (AHU)
Peter Campbell

Air Handling Units (AHUs) are the backbone of HVAC systems, responsible for regulating and circulating air to maintain comfort and air quality in buildings. While the components of an AHU ensure its physical operation, AHU control systems are what drive efficiency, precision, and sustainability.

At iACS, we specialise in tailored AHU control solutions designed to optimise your system’s performance, reduce energy costs, and enhance operational reliability. This blog explores how AHUs work, the importance of controls, and how partnering with iACS can transform your HVAC operations.

Table of Contents

  1. What is an Air Handling Unit (AHU)?
  2. Key Components of an AHU
  3. The Role of Controls in AHU Performance
  4. Benefits of Tailored AHU Control Solutions
  5. Why Choose iACS for AHU Controls?
  6. Conclusion

What is an Air Handling Unit (AHU)?

An Air Handling Unit is a centralised system that conditions and circulates air as part of an HVAC system. Located in mechanical rooms, rooftops, or basements, AHUs regulate indoor air quality and temperature, ensuring a comfortable and healthy environment.

Key Components of an AHU

1. Filters

Remove airborne contaminants to improve air quality and protect the system.

2. Fans

Circulate air throughout the building via ductwork, ensuring even distribution.

3. Heating and Cooling Coils

Adjust the air temperature to meet occupant needs.

4. Humidifiers

Add moisture to the air to maintain optimal humidity levels.

5. Dampers

Control the amount of fresh, return, and exhaust air that enters and exits the system.

6. Sensors and Control Systems

Monitor and manage the AHU’s performance, ensuring energy efficiency and precise operation.

The Role of Controls in AHU Performance

While the physical components of an AHU manage air movement and conditioning, the control systems ensure the unit operates efficiently and effectively.

Key Functions of AHU Controls:

  • Energy Optimisation: Controls regulate fan speeds, heating, and cooling outputs to match building demand, reducing energy waste.
  • Zoning: Enables custom temperature and air quality settings for different areas of a building.
  • Monitoring and Diagnostics: Advanced controls provide real-time performance data and fault detection, minimising downtime.
  • Integration: Modern control systems integrate seamlessly with Building Management Systems (BMS) for centralised monitoring and management.

Benefits of Tailored AHU Control Solutions

1. Enhanced Energy Efficiency

Properly configured controls reduce unnecessary energy consumption, helping achieve sustainability targets and lower operating costs.

2. Improved Indoor Air Quality (IAQ)

Accurate sensor readings and control adjustments ensure a steady flow of clean, comfortable air throughout the building.

3. Reduced Maintenance Costs

Real-time data from control systems enables predictive maintenance, reducing the likelihood of costly breakdowns.

4. Customisation

Tailored solutions from iACS allow AHUs to meet the specific needs of your building, whether it’s a commercial office, hospital, or industrial facility.

5. Regulatory Compliance

With offerings such as our standard HTM spec AHU Control System, we ensure that you comply to all the relevant HTM requirements

Why Choose iACS for AHU Controls?

1. Industry Expertise

With years of experience, iACS is a leader in designing and implementing advanced AHU control systems.

2. Bespoke Solutions

We provide fully customised AHU control systems tailored to your building's unique requirements.

3. Advanced Technology

Our solutions feature cutting-edge components, including programmable logic controllers (PLCs), sensors, and IoT-enabled monitoring systems.

4. End-to-End Service

From consultation and design to installation and commissioning, we handle every stage of your AHU control system project.

5. Sustainability Focus

iACS designs controls to align with energy efficiency goals, helping you achieve a lower carbon footprint.

Applications of AHU Controls

  • Commercial Offices: Achieve energy efficiency and consistent air quality for employees.
  • Healthcare Facilities: Maintain precise airflow and sterile conditions in sensitive environments.
  • Industrial Facilities: Ensure temperature and air circulation stability for manufacturing processes.
  • Educational Institutions: Provide comfortable learning environments with optimised energy usage.
  • Retail Spaces: Enhance the customer experience with reliable air quality and temperature control.

Conclusion

Air Handling Units are at the heart of HVAC systems, but it’s the control systems that unlock their full potential. By investing in tailored AHU controls, you can optimise energy efficiency, enhance indoor air quality, and extend the lifespan of your equipment.

Take the next step toward a smarter, more sustainable HVAC system. Visit i-acs.co.uk to learn more about our AHU control solutions and how iACS can help your building achieve peak performance.

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