Latest AHU Installation Instruction

AHU plays a crucial role in the ventilation and air conditioning systems for large-scale constructions such as high-rise buildings or clean rooms in factories and workshops. Installing AHU requires strict adherence to procedures to ensure optimal operation efficiency and safety for the construction project. In this article, let’s explore AHU, as well as the most detailed steps for AHU installation, with INTECH Service!

What is AHU? Applications of AHU

AHU stands for Air Handling Unit, also known as an air processor. It is a device used to regulate and circulate air as part of heating, ventilation, and air conditioning (HVAC) systems. AHU is often likened to the “heart” of HVAC systems, playing a vital role in ensuring air quality for constructions.

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AHU is widely applied in various fields, including residential, commercial, and industrial sectors:

Manufacturing plants with high cleanroom requirements: Pharmaceuticals, cosmetics, food, electronics, medical equipment, pharmaceutical packaging, etc.

Industrial manufacturing plants: Electronic components, semiconductors, chemicals, petrochemicals, automobiles, etc.

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Systems requiring very high cleanliness standards: Operating rooms, IVF labs, tissue banks, laboratories, testing facilities, etc.

Residential and commercial buildings: High-rise buildings, large shopping centers, etc.


Instruction to the latest steps for AHU installation

AHU installation is a complex process that requires attention to detail. The specific steps are as follows:

Moving AHU to the installation location

Use forklifts or appropriate moving equipment suitable for the weight of AHU (typically from 200-500 kg per module).

Ensure the moving surface is flat, without bumps, with enough space for forklifts and AHU movement.

Use secure straps and cables to fasten AHU to the forklift.

Wear appropriate personal protective equipment such as gloves, helmets, etc.

Move AHU carefully, avoiding collisions, dents, keeping AHU balanced and not tilting.

Observe the surroundings carefully, ensuring safety for people and obstacles, then move AHU to the predetermined installation location.

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Connecting AHU installation with ductwork

Check the connectors to ensure that the connectors on AHU and ductwork are compatible, and use bolts and screws to secure the flexible connectors to AHU and ductwork.

Use insulation tape to tightly wrap the flexible connectors to ensure no condensation or heat loss.

Use adhesive or other materials to ensure the tightness of the connections.


Ensure that the ducts are installed in the correct position and securely fixed.

Use appropriate insulation materials to ensure the efficient operation of the system.

Comply with labor safety procedures when connecting AHU to ductwork.

Connecting AHU with ODU/Chiller

AHU is a heat-using device, it is connected to the outdoor unit compressor, or the ODU (condensing unit). They are connected by copper pipes to carry refrigerant to AHU. For AHUs connected to Chillers, steel pipes or PPR pipes are commonly used. These pipes are responsible for transferring chilled water from the Chiller to AHU.

Connecting AHU with AHU control system

The AHU control system or AHU control panel is a device that controls equipment such as fans, valves, etc., to adjust the temperature and humidity in the room.

Typically, DDC controllers or PLCs are used to control AHU. The control panel is placed in the control room, the plant’s electromechanical room, or directly in the room depending on the factory’s model.

Connecting the condensate drain line for AHU

Connecting the condensate drain line is an important step in the AHU installation process. This connection needs to be carefully and accurately made to ensure the efficient operation of the system and avoid issues such as water leakage, blockage, etc.

When connecting, install a trap at the lowest point of the pipe to prevent air from escaping. Connect the pipe from AHU to the trap and then connect it to the drain outlet. Install a filter mesh at the end of the pipe to prevent insects and animals from entering. Then use pipe sealant or other measures to ensure the tightness of the connections.


Slope: Ensure that the pipes have the proper slope (about 1-2%) for easy water flow.

Pipe size: Choose the appropriate pipe size for the condensate water flow to avoid blockages.

Checking and testing AHU

After installation, it is necessary to check the following issues before testing AHU to ensure safety, efficiency, and avoid issues during operation:

Check if the machine has been installed according to the procedure.

Check the machine’s condition.

Check the power supply.

Check for safety conditions during operation.

Notes when installing AHU

To ensure safety, efficiency, and longevity of AHU, it is crucial to adhere to the following guidelines:

Installation location

Choose a spacious, easily accessible location for operation and maintenance.

Keep away from heat sources, dust, chemicals, and other environmental factors that may affect AHU operation.

Ensure there is enough space for maintenance, repairs, and replacement of parts.

Installation according to instructions

Strictly follow the manufacturer’s installation instructions to ensure proper AHU installation.

Use appropriate tools and accessories for each installation step.

Thoroughly check connections, pipes, wires, and other parts before operating AHU.

Labor safety

Comply with labor safety procedures during AHU installation.

Use personal protective equipment such as gloves, safety glasses, etc.

Disconnect the power before performing any operations on AHU.

Be careful when transporting and moving AHU parts.

Other considerations

Install a suitable ventilation system to ensure AHU operates efficiently.

Use appropriate insulation materials to minimize noise and heat loss.

Regularly maintain AHU to ensure efficient operation and long service life.

Frequency of AHU maintenance and servicing

After a period of operation, AHU systems may encounter malfunctions, leading to shutdowns, so regular maintenance and servicing of AHU are necessary to ensure smooth and efficient operations.

Here are general recommendations for AHU maintenance frequency:

Filters: Replace the main filters every 3-6 months, or more frequently if necessary. Clean other filters (such as HEPA filters) according to the manufacturer’s instructions.

Fan: Clean fan blades and fan bearings every 6 months. Lubricate fan bearings according to the manufacturer’s instructions.

Coil: Clean coils every 12 months. Check and recharge refrigerant if necessary.

Air damper: Clean air dampers every 6 months. Check and adjust the position of air dampers if necessary.

Ductwork system: Clean ductwork every 12 months. Check and seal any leaks in the ductwork system.

Additionally, you should check AHU monthly to ensure efficient operation. Checking includes: Checking the temperature and humidity of AHU output, checking AHU vibration level, checking AHU noise level, checking for signs of water or gas leakage.

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INTECH Service is an experienced unit in AHU maintenance and HVAC maintenance – ventilation and air conditioning systems in general. With reputable, professional maintenance services and the use of modern equipment, it is a reliable address when you need a unit to maintain and repair machinery. If you have any questions or need assistance, please contact us for advice!”