LeMans LL Brushless 24V Speed Controller – Stepless 0–100% Fan Speed Adjustment

Take precise control of your G&C LeMans LL Brushless 24V roof ventilator. This dedicated speed controller allows you to adjust the fan speed continuously from 0 to 100%, making it easy to match air extraction to the requirements of your truck, commercial van or other vehicle.

Designed specifically for the LeMans LL Brushless 24V, the controller changes the control voltage used by the motor electronics. A rotary knob allows convenient speed adjustment, with the fully counterclockwise position serving as OFF.

Key benefits

• Stepless speed adjustment: continuously adjustable from 0 to 100%.
• Designed for Brushless: matched to the LeMans LL Brushless 24V motor electronics.
• Simple rotary control: choose the required ventilation level with one knob.
• Integrated OFF position: fully counterclockwise.
• Adjustable extraction: select lower or higher fan speeds as needed.
• Improved comfort: operating noise may be reduced at lower speeds.
• Efficient operation: use maximum ventilation only when necessary.
• Dedicated compatibility: not intended for conventional LeMans or Round DC motors.

How does the speed controller work?

The G&C LeMans LL Brushless 24V roof fan uses an electronically controlled brushless motor. The controller adjusts the motor control voltage to vary the rotational speed continuously.

• 0% – OFF: rotary knob fully to the left.
• Low setting: reduced air extraction.
• Higher setting: stronger active ventilation.
• 100%: maximum selected fan speed.

Actual airflow depends on the fan installation, available air inlets and vehicle conditions.

Adjust airflow and noise to your needs

A roof fan does not always need to operate at full speed. A gentle level of extraction may be sufficient during normal operation, while more ventilation may be needed in hot or humid conditions.

With this controller, you can easily adjust the fan's performance. Lower speeds may reduce running noise and energy consumption compared with continuous operation at maximum speed.

Only compatible with LeMans LL Brushless 24V

Product 30-4000 is intended specifically for the G&C LeMans LL Brushless 24V roof ventilator.

Not suitable for: LeMans LL Brushless 12V, conventional LeMans 12V/24V, G&C Round or other fans without verified compatibility.

The general PWM speed controller 30-3004 is a different product and should not be used as a substitute for this dedicated Brushless controller.

No airflow direction reversal

The LeMans LL Brushless roof ventilator is intended for active extraction. This speed controller changes fan speed only.

It does not reverse motor rotation or switch between intake and extraction. The polarity-reversing 3-position switch used with conventional DC roof fans is not suitable for this Brushless motor.

Combine with the dedicated connection kit

The speed controller can be combined with the LeMans LL Brushless 24V connection kit with 2-position switch.

The connection kit provides the electrical connection and ON/OFF switching. This separate controller adds variable fan speed.

Always follow the correct wiring diagram for the fan, connection kit and speed controller.

Technical specifications

• Product: roof fan speed controller
• Product number: 30-4000
• Compatibility: G&C LeMans LL Brushless 24V
• Control range: 0–100%
• Adjustment: stepless
• Operation: rotary knob
• OFF position: fully counterclockwise
• Control method: variable control voltage
• Motor type: 24V Brushless
• Motor direction reversal: no
• Application: vehicle roof ventilation speed control
• Package contents: 1× speed controller
• Roof ventilator included: no
• Connection kit included: no

Installation and connection

1. Confirm that the fan is the G&C LeMans LL Brushless 24V model.
2. Disconnect the electrical power before installation.
3. Choose an accessible mounting position for the rotary control.
4. Wire the controller strictly according to its designated connection diagram.
5. Use suitable electrical connections and circuit protection.
6. Protect wiring against sharp edges, heat, moisture and moving parts.
7. Check all connections before reconnecting power.
8. Test the OFF position and the full range of speed adjustment.

Important: the dedicated Brushless controller operates with the motor's electronic control system. Do not treat it as a universal power controller for conventional DC motors. Follow the manufacturer's instructions or consult a qualified installer.

Vehicle applications

• Trucks with 24V electrical systems
• Heavy commercial vehicles equipped with LeMans LL Brushless 24V
• Service vehicles and mobile workshops
• Special-purpose vehicles requiring active roof extraction
• Trailers with a suitable 24V supply

Frequently asked questions

Which fan is this controller designed for?
Only the G&C LeMans LL Brushless 24V.

Can fan speed be adjusted continuously?
Yes. The range is 0–100%.

Can I switch the fan completely off?
Yes. The fully counterclockwise knob position is OFF.

Will it work with a 12V Brushless fan?
No. Product 30-4000 is designed for the 24V version.

Can it reverse the airflow direction?
No. It controls speed, not direction.

Is it the same as PWM controller 30-3004?
No. The 30-3004 is a different controller for compatible conventional DC motors.

Does the package include the connection kit?
No. The dedicated Brushless connection kit is sold separately.