Can the fan speed be controlled by a dimmer

Wiring Diagram for Triac or Thyristor Fan Speed Controller

Almost all regulators have a fusible link inside to protect them from overload currents or short-circuits, in the event of which they burn out. To restore operation, it will be necessary to replace or repair the fusible link.

The regulator is connected quite simply, like a normal switch. At the first contact (with an arrow) is connected phase from the electrical wiring of the apartment. On the second (with an arrow in the opposite direction), if necessary, is connected directly to the phase without adjustment. It is used to switch on the light when the fan is switched on, for example. The fifth contact (with a slanted arrow and a sinusoidal line) is used to connect the phase to the fan. When using this scheme should be used to connect a junction box from which the Zero and if necessary ground are connected directly to the fan, without the regulator itself, which only needs 2 wires.

Triac regulators are used to control the speed of single-phase motors with a 220 V supply voltage. Dimmer (dimmer switch), in turn, is designed to control resistive loads and should be used only as a lamp dimmer.

Reduce the speed of the exhaust fan.

  • capacitor in series. non-polar (or two polar ones with plus to plus between them, minus to the wire gap.
  • Powerful 30 watt resistor, like a soldering iron or a light bulb. This method is not very effective, half of the wasted energy will be spent on the resistor.
  • rewinding of fan motor with thinner wire.
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Ways of adjusting the speed of rotation of household fans

There are quite a few different ways to adjust the fan speed, but only two of them are practically used at home. In any case, you can only reduce the speed of rotation of the engine only below the maximum possible according to the passport to the device.

To overclock the motor is only possible with the frequency regulator, but it is not used in homes, because it has a high cost as well as the price of the service of its installation and adjustment. All this makes the use of a frequency regulator not rational in the home.

Several fans can be connected to one controller as long as their total power is not greater than the controller’s rated current. Note when selecting a regulator that the motor starting current is several times higher than the operating current.

Ways to regulate fans in the home:

speed, dimmer
  • Using a triac speed controller is the most common and allows the fan speed to be increased or decreased gradually from 0 to 100%.
  • If a 220 V fan’s electric motor is equipped with thermal protection (protection against overheating), then a thyristor regulator is used for speed control.
  • The most effective method of adjusting the speed of rotation of the electric motor is the use of motors with several leads of windings. But I have not yet encountered multi-speed electric motors in domestic fans. But on the Internet you can find wiring diagrams for them.

Schematic diagram of a step regulator with autotransformer

The controller in combination with the auto transformer works as follows. A supply voltage, rated 220 volts, is applied to the input of the transformer. Its winding is equipped with several branches departing from some of the coils.

When a load is connected to these taps, the voltage supplied to the consumer is reduced. The circuit involves a special switch that is used to connect the motor to the desired part of the winding. The result is a change in the speed of rotation.

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After the supply voltage is lowered, the electricity consumption is also reduced. A pure sinusoidal output signal is produced at the transformer output, positively influencing the motor winding. A significant disadvantage of this scheme is too large a control unit. The adjusting knob is equipped with a five-step scale, which eliminates the smooth speed control.

speed, dimmer

Diagram and step-by-step instructions for connecting the unit

The first step is to make preparations: turn off the power supply, turn off the equipment. Assemble the necessary tools. an indicator screwdriver will be needed.


Next, the breaker button is removed and the box is removed, the mechanism is removed. The step-by-step algorithm after extraction is as follows:

  • The first is to remove the switch cables;
  • Connect the phase wire to the breaker;
  • Connecting the second wire to the artificial light fixture.

Phase output must be connected to L-in terminal. and the second to L-out. Be sure to follow this rule.

The operation manual for the dimmer specifies the connection sequence. But special attention should be paid to the phase wire, which is connected strictly to the outer terminal.

DIY Community Blog Exhaust fan and light dimmer. not friends?

Continuation of the theme of ventilation in the kitchen. So, in the closet that closes the vent, cut a hole in the wall broke out of the grill times of tsar Khrushchev. Screwed to the wall of the cabinet uh, I do not remember what it’s called. Cut a hole in the closet door for the propellerpro 150. All this is connected with a corrugated 150 with clamps. I hooked up the 220. it worked, the ventilation blew. there was a draft. But I thought about a smooth regulation of the speed, I asked the fan support. it is possible, go ahead. Well, I put it. And when you turn on the fan there is a nasty squeak. On what it depends and how to fight?

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Next generation. electronic dimmer

There is no fundamental difference in approach. Remaining power still goes to the atmosphere in the form of heat. That is, by dimming the brightness of the lights, you do not save energy, but only add comfort.

However, electronic dimmers work by the contactless method, or rather the slider of the variable resistor is taken to the low-current zone. No more sparking scraping against the coils of wire, the low-power resistor controls the electronic switch. thyristor. Power (voltage) is reduced in a semiconductor crystal, smoothly and accurately. Excess energy is dissipated through the heat sink. There are different circuits of electronic dimmers, the most expensive are built on triacs. Such devices save a little energy, up to 20%. Given the initially high cost of high-quality regulators. it is worth buying them only for comfort.

On modern dimmers, the knob is almost never used. Since the whole circuit is electronic, the sensors are.

There are also regulators with remote control. How to connect such a dimmer? No special circuitry. Controller is installed in place of, or after the circuit breaker. Room devices have the same form factor as other switching devices: sockets, switches. The most popular variant. key and regulator in one housing.

speed, dimmer
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