Auto-transformer

Introduction

In a professional kitchen, controlling airflow is essential to ensure comfort, safety, and energy performance. The auto-transfo, or auto-transformer, is a key component of HVAC ventilation systems. It allows for regulating the speed of extraction and supply fans to adjust airflow according to actual needs. Thanks to this equipment, it is possible to achieve efficient, quiet, and energy-saving ventilation, while preserving the lifespan of the motors.

1. What is an auto-transformer?

An auto-transformer is an electrical device used to modify the supply voltage of a motor. Unlike a conventional transformer, it only has a single wound coil, equipped with several intermediate taps. These different outputs offer multiple voltage levels, which makes it possible to vary the motor speed of the fan.

In professional kitchens, it is mainly used to adjust the power of single-phase or three-phase motors. This simple and economical system ensures precise and progressive regulation without loss of efficiency or excessive motor heating.

2. The role of the auto-transfo in a professional kitchen

In catering establishments, ventilation needs vary throughout the day. A lunch service requires maximum extraction, while cleaning or an inactive period demands a lower flow rate.

The auto-transfo allows to:

• Adapt the airflow to the workload.

• Reduce fan noise during quiet periods.

• Decrease electricity consumption by adjusting the voltage.

• Preserve the lifespan of equipment by avoiding continuous full-power operation.

It thus contributes to smarter and more comfortable ventilation, while optimizing operating costs.

3. The advantages of using an auto-transfo

The installation of an auto-transformer in a professional ventilation system offers many advantages:

• Reliable and easy-to-use regulation, with manual or automatic speed selection.

• Compatibility with most HVAC ventilation motors.

• Reduced operating noise for a more pleasant working environment.

• Motor protection through controlled voltage.

• Optimized energy consumption, allowing for long-term savings.

• Electrical safety compliant with professional standards.

Its robust design and precise operation make it an indispensable equipment for all air extraction or supply installations.

4. The different types of auto-transformers available

There are several models of auto-transformers, adapted to each type of installation:

• Single-phase auto-transfo: for small fans operating on 230 V.

• Three-phase auto-transfo: for more powerful motors supplied with 400 V.

• Multi-speed auto-transfo: generally offers 3, 4 or 5 speeds for precise airflow adjustment.

• Wall-mounted or recessed auto-transfo: depending on available space and kitchen configuration.

Some models include additional features such as an on/off switch, an indicator light, or integrated thermal protection, for greater practicality and safety.

5. Installation and use of an auto-transfo

The installation of an auto-transformer must be entrusted to a qualified electrician, as it involves direct connection to the motor's power circuit.

The main steps are:

1. Check motor compatibility (voltage, current, power).

2. Install the box in a ventilated and accessible location.

3. Connect the cables according to the diagram provided by the manufacturer.

4. Select the desired speed using the rotary selector or switch.

5. Test the system to ensure balanced and quiet extraction.

Simple maintenance, consisting of checking electrical connections and regularly cleaning the casing, is sufficient to guarantee the proper functioning of the device over time.

6. Why choose our professional auto-transformers?

Our auto-transformers for professional ventilation are specially designed to meet the requirements of the catering sector.
They offer:

• High reliability and extended lifespan.

• Single-phase and three-phase versions compatible with all fans.

• Multi-speed models for precise airflow control.

• Simple and secure installation thanks to a robust casing.

• Dedicated technical service for advice and maintenance.

Our products guarantee smooth regulation, energy savings, and optimal electrical safety for professional kitchens, hotels, breweries, and communities.

Conclusion

The auto-transfo is an essential component in any professional ventilation system. Thanks to its ability to adjust fan speeds, it ensures controlled, quiet, and energy-efficient ventilation.

Investing in a quality auto-transformer means improving the safety, comfort, and durability of your HVAC installation. Our robust and high-performance models offer a reliable solution for effectively regulating airflow and optimizing the operation of your hoods and extraction units.