Repair of floor fan with your own hands
In the case when the fan does not pull and poorly blows air, you will need to disassemble the housing, which houses the motor. Sometimes the fact that the propeller does not spin can be a sign of insufficient lubrication in the sliding bearing installed in the electric motor.
To disassemble the fan proceed as follows.
First you need to unscrew the safety net (the front of it) and remove it. After the grid, disconnect the propeller. It can be screwed to the motor shaft with a left-hand thread nut. That is, to unscrew the nut, turn it clockwise, and to screw it in. counterclockwise. Remove the rear guard by unscrewing one more nut. Unscrew all fasteners securing the pump-motor unit casing. Sometimes there is another bolt in the crank to adjust the rotation of the housing. If it is not unscrewed, you will not be able to remove the cover of a motor. Now, when the motor is open, it is necessary to drop some drops of machine oil (it is better to use oil of spindle) on the bushing (it is marked with red arrow) and to turn a shaft some times in different directions, so that the grease is absorbed inside. After this procedure, a slight rotation of the shaft will resume. Reassemble the motor housing in reverse order. Turn the unit on and check the airflow.
The reasons why the floor fan does not work. the connection diagram and how to fix your own hands.
On the hottest summer days, the only escape from the sweltering heat is an ordinary floor fan.
Not everyone can afford a full-fledged split system or even a mobile conditioner.
But unfortunately, even this inexpensive and affordable windblower breaks down from time to time. Especially Chinese models fly like sunflower seeds.
And they are in our market in overwhelming majority. What to do if the fan stops rotating and works? What are its main weaknesses and why it breaks?
There are 5 main reasons of failure of floor fans:
How to fix a fan spinning slow.
The main problem with cheap models, which for some reason few people pay attention to, is the improper casting of the blades. Because of this there is imbalance, the bearings break, the clearances increase.
You can not influence this, because you have already bought the fan with this initial defect. Sometimes it seems to work, the impeller rotates normally, but it does not blow.
That is, there is no cooling air flow from it. Why does it happen??
Because of the wrong angle of attack of the blades. Its blades are deformed and are pumping airflow in circle and not blowing it out.
This effect can also occur over time, after the fan has been standing in direct sunlight for a long time and the impeller has become hot and begun to change shape over time.
This can only be cured by replacing the impeller with a new one.
The most common problem is dried up grease or lack of it. The fan begins to jam, losing speed and as a consequence, the load on the engine increases. The blower no longer operates at its full potential.
The motor, wound with a thin wire of 0.2 mm, begins to heat up and gradually burn out the windings.
How this defect is detected? In this case, the fan stops rotating. It hums, but the impeller does not rotate.
And it happens that it starts only at the 3rd speed, and does not react to the first two. It just doesn’t have enough power to crank the shaft.
To start it, you have to spin the blades like on old planes.
By the way, the same symptom can be and when the starting capacitor is damaged. How to know without any instrumentation, which cause is responsible for the failure?
To do this, you must at least get to the motor shaft, removing the protective cover and blades. If the shaft rotates by hand with great difficulty, blame dirt and dried grease.
And if it rotates easily and has inertia, it is likely that the cooler has failed. The symptom. you plugged in the fan, and it does not rotate. You crank the motor at full speed and it will start.
If you hold the blades of the fan with your hand while running, it can stop again. Check the capacitor with a multimeter, if it has the appropriate scale for measuring the capacity.
For replacement, pick up a new condenser with the same parameters that are listed on the body of the old one.
By the way, not completely dried out condenser also affects the speed. If you notice that they have dropped and the fan is spinning slower, it is a bell to check it.
Malfunction of ventilation in the apartments
Fume extractor fans are much easier in terms of design. But their cost is low, and it’s often easier to buy a new one than to look for parts that have disappeared from circulation. Poor ventilation of the premises can be associated not with the work of the device itself, but with errors in the organization of the exhaust system.
Ventilation in the bathroom
When the ventilation does not work in the bathroom, the air becomes moist and not ventilated, laundry dries badly, mold can appear.
Normal scheme of ventilation
- The vent hole is clogged with dust and cobwebs;
- Foreign objects in the shaft;
- the exhaust fan is set to draw air in instead of out.
The right way to solve the problem is to contact the management company. Specialists lower a weight into the ventilation shaft to the apartment to break through all obstacles. In particularly severe cases, a camera is lowered into the shaft to locate obstacles. The ventilation shaft is opened from the entryway side. You may have to go around the neighbors in the riser and check to see if they have improperly installed fans that disrupt the exhaust.
Tip! For the bathroom, an exhaust fan with a non-return valve that prevents air currents from entering the ventilation shaft is suitable.
The cooker hood in the kitchen
Exhaust ventilation is designed to remove unpleasant odors and stale air from the apartment. If there are construction faults or other reasons, however, the exhaust air can escape into the apartment even though the fan is working.
The ventilation shaft is contaminated
It causes unpleasant smells in the apartment. Cooking products do not escape from the kitchen. Causes may include the following:
- Defects in the design of ventilation shafts and ducts create a reverse draft;
- Strong wind gusts in one direction blows air into the shaft;
- build-up of steam masses and frosty air in the vent;
- Snow and debris contamination of the sump.
As a result, the axial fan pulls the air masses from one shaft to the other and the hood begins to work silently in the opposite direction.
To solve the deficiencies, it is better to invite professionals. They will assess the rationality of the equipment in accordance with the documentation and conduct a qualitative examination of the installation and operation of the ventilation system. The report received will indicate all the shortcomings of the existing system and measures to correct them. The AC employees must clean the ventilation shafts from foreign objects. Also to get rid of the effect of back draft in the hood install deflector for sucking smoke and create in the kitchen air currents.
Repair of the fan with your own hands
To see clearly how the repair of floor or table fan, you can in the following
Pay attention to the following useful tips:
- Do not let the ventilator run too long (uninterrupted);
- Do not use fan technology with the rotating elements open, i.e. with no guard grille;
- Do not allow direct sunlight on the plastic elements (they deform);
- do not forget about lubrication;
- Do not install the unit near heaters (gas or electric stove);
- if you doubt that you will remember the exact location of all the parts, it is better to take appropriate pictures during the disassembly of the fan;
- do not plug the device directly into the mains after your own repair. use RCD blockers (if they work, take the fan to a workshop or double-check the connection of wires).
If you started the repair of floor fan or table fan with your own hands, be sure to study all the information, and if necessary, consult with experts. Even if you do not have enough experience, still try and believe in your strength.
Household Fans Repair. With Your Hands. Electric diagram of the ventilator
I believe that the information presented in this topic will be useful for you. The topic will address various issues in this area, and there are many questions on this part:
How to rewind a fan motor stator, how the repair is done:
To state at once and completely the information on the arising questions, connected with malfunctioning as a result of operation of various types of electric fans. it is almost impossible.
The topic will be gradually expanded, that is, after a certain period of time, additions will be made.
Get interested in various sources of information in this direction:
and so on. Build up your experience and knowledge.
How to disassemble the fan. instructions with photo
How to get to the bushings without removing the engine? First, unscrew the center screw on the back of the protective cover.
Another self-tapping screw is hidden in the adjusting button lever to turn or stop the fan head.
After that, the back cover is easily removed from its place. What’s underneath it? Here you can see the swivel gearbox, which gives rotation to the entire head.
There is a special rod at the bottom of the shaft.
The motor starter capacitor is mounted on top.
By the way, keep in mind that it might not be there on different models. In this case, look for it near the gearshift buttons.
You have to remove the gearbox to access the motor bearing. It is mounted on three screws and is supported from below by a rod.
You unscrew the screws and disconnect the rod. After that, you can take it off the shaft and access the rear bushing.
There’s no need to unscrew or disassemble anything else. Wet cleaner will do the rest.
You put a thin tube of WD40 spray on the bottle and spray it several times in the gap between the shaft and the bearing.
After spraying with WD40, turn the shaft by hand in different directions and move it back and forth a little.
Excessive grease, debris, and dust will gradually come out. You can easily remove this excess dirt with a cotton swab.
If you have a thick grease like Tsiatim or Lithol, it is advisable to apply it to the gear worm. After these cleaning procedures, drop a few drops of sewing machine oil on the outside of the bearing.
Just don’t put too much of it on. Otherwise it gets all over the place and the dust sticks to it and turns back into dirt. You’ll end up with a wedge and fan rotation problem again.
In some models there are felt washers near bushings. They are impregnated with oil, and when heated the oil flows onto the shaft, lubricating it.
Reassemble in reverse order. Puller. three screws on the gearbox. outer cover.
By the way, if you over tighten the central screw on the back cover, which is a screw, not a screw, it can go through the plastic of the worm gear and bump into the shaft.
With the rear bearing solved, then move on to the front of the fan. There is a protective cap in the center.
It unscrews, watch out. clockwise as the threads are left handed. Dismantle it and remove the propeller from the shaft
You now have access to the front plain bearing
Dismount it and remove the propeller from the shaft. You now have access to the front plain bearing.
The principle is the same. First squeeze out and soften the old grease and dirt with liquid cleaner, then apply the new grease.
Then put the propeller back on and close the cover. After finishing the repair turn the fan on at high speed and leave it to work a few minutes switch it to the desired speed.
Windings short-circuited or wire breakage
If the damage is more complicated and simple lubrication does not help, you have to disassemble the fan in detail.
First do all the disassembly maneuvers as above. After removing the propeller, unscrew the plastic front locknut, which is located right behind it, and unscrew the whole protective frame.
In your hands you are left with the motor itself and the leg, in which the power wires and the button mechanism is located.
Disassemble this leg by removing the 6 tapping screws.
First of all check the soldering of the wires. It is possible that one of them, or even more than one, has come loose or is burned out.
If all is intact, how do you know which wire goes where and what it does?? Start with the two wires from the power plug.
One of them, let it be black (as on the photo below), through the light bulb goes directly to the fan motor.
The second wire goes to the lower terminal of the dial switch (button 0).
Then, by pressing the corresponding buttons. 1st speed, 2nd, 3rd, those or other contacts of the switch are closed, and thus the speed of the motor changes.
Each wire from these buttons goes to a different lead on the winding, with more or fewer turns. You can turn the propeller faster or slower by putting voltage on them.
Wiring diagram of the fan in the bathroom
The way to connect the fan in the bathroom, depending on the scheme chosen.
How to connect the fan in the bathroom to the light bulb (parallel to the lamps)
In this case, the wire that powers the unit, connected to the same terminals to which the ceiling lamp is connected. Wires are connected in the junction box. For ease of repair it is desirable to keep color coding wires (zero-phase), but the fan is not affected by this.
From a single or double light switch
When using this scheme connection is made in a junction box similar to the usual lights:
Ceiling Fan Animation
- A phase (brown) wire is led to the switch. In the two-key device, it is already connected for ceiling lighting.
- The wire coming from the switch is connected to the brown wire running to the fan. Depending on the number of keys, it may be blue or yellow-green.
- The blue wire of the cable that leads to the hood is connected to the common neutral conductor of the lighting.
Timed fan connection
This is the optimum way to switch on the cooker hood. The device switches itself off after a short period of time since it was switched on. The timer can be controlled in various ways:
- Separate switch. Switching on is done manually, the switch must be turned off to turn it off, the hood stops after a short period of time.
- Button. For switching on at a preset time interval, the button must be pressed.
- Light switch. Light and fan are controlled with a single switch. The fan continues to run for some time after the lights are switched off. Depending on the construction of the timer, the cooker hood motor can be switched off while the light is on.
The 220V power supply and the control voltage are necessary for the device’s operation, that is why the hood is powered with a three-wire cable. Connect according to the marking of the timer terminal and the colors of the conductor insulation:
On the L and N terminals of the timer fan, the voltage is 220 volts. The timer itself runs on the phase, which is fed from the switch. terminal “T”.
In the junction box comes the supply cable, the cable from the lighting group and the cable from the exhaust fan. All neutral wires (blue) in the box we connect together. Then connect the phase wire from the fan (which is connected to terminal “L”) with a phase wire from the panel and a phase wire that will go into the socket on the switch.
Then we connect one of the fan wire strands and the cable from the switch. And we are left with two wires, one from the switch and the other from the light fixture and we connect them together. With the connection of the terminal box is solved.
Incorrect wiring will result in the fan not turning on or off.
Motor from a floor fan. The floor fan doesn’t turn on, what to do
In hot weather, the floor fan is an indispensable device that can create coolness, in the absence of. Any fan includes a large number of moving parts that are subject to wear and tear.
The fan and the electric motor are mounted on different ends of the same shaft. There is also a device that provides rotation in different directions.
From time to time, various malfunctions occur, and then it is necessary to make repairs of floor fans.
All fans have a typical device, so their faults are also largely the same.
Deformation of the fan blades
Happens quite often, because the propeller itself is made of plastic. The blades can deform under the influence of high temperatures. As a result of deformation, the blades catch on the protective grid, and the characteristic unpleasant noise occurs. The deformation is usually repaired manually, otherwise, the blades and guard will very quickly become completely unusable.
Deformation of the guards
Appears, as a rule, as a result of floor fan fall. The chainwheel is made of a fairly thin wire and consists of two parts, one in the front and one in the back.
The front part is very easy to remove, but the rear part will need some fiddling. The propeller is removed from the motor shaft, then the large plastic nut is unscrewed and then the guard itself is removed.
After straightening, the guard is assembled in the reverse order.
Turning sideways is stopped
The main reason for this may be a disconnected crank. It is necessary to disassemble the housing of the device and tighten the fixing screws if they are loose or unscrewed. In addition, in the mode of rotation can occur intermittent.
To find out the cause, check the engagement of the gears and the work of the derailleur. If necessary, the reducer is lubricated with a special grease. In the case of heavy wear and tear it is recommended to replace the part.
If there are no parts to replace, the fan can be used as usual, without turning on.
May cause intermittent operation. To check its condition, it is necessary to remove the switch and determine the condition of the contacts. If necessary, the contacts should be scraped with emery paper.
The fan does not work at all
In this case it is necessary to check the correct functioning of the electric motor. If it turns out that the electric motor is defective, repairing floor fans, in this case, is not economically feasible.
I will not dwell on mechanical failures such as repair of impeller, casing, turning mechanism, etc. п. To repair these faults, the worn or broken part must simply be repaired or replaced with a new one.
This article will address repair issues with the electrical part of the fan that won’t turn on or the electric motor is running with a hum, foul smelling fumes or jamming.
For consideration we will take a more complicated model of the floor version. Built-in exhaust fans are structurally much easier, because there is no speed changer, so they are even easier to repair.
But the repair, given the price of a simple model of exhaust fan without frills is impractical.
In order to find the cause of the fan defect it will be necessary to disassemble it. To do it with your own hands is fairly simple and fast.Firstly we will remove the protective grill, then blades or impeller of the fan, which is fixed by the nut. Next, you need to remove the second part of the protective grid and unscrew the screws of the cover.
Troubleshooting for domestic fan repair
Before proceeding to repair with your own hands it is necessary to study the circuit diagram of the device. As a rule, asynchronous electric motor, consisting of eight windings (operating and starting), is installed in the floor fan. A phase shift of 90 degrees is necessary for a successful start-up. A capacitor is installed for this purpose.
The device starts to work after the button is pressed, after which the indicator lamp lights up and the motor starts, the speed of which depends on the winding switching scheme, for which the 3-speed switch with a mechanical blocking of the simultaneous switching of several buttons, which can cause the occurrence of short circuits.
Before proceeding to check the electric motor:
- Check immediately that the cable to the electric socket is in good condition. To do this, first of all disassemble the switch block, and then with observance of electrical safety measures check the presence of 220 volts on the contacts of the bulb with a multimeter.
- Check the condition of the capacitor according to these instructions.
- Test for continuity and check all contacts of wires and connections in the circuit for reliability. Instructions for the wiretap.
- If you hear a hum or noise when the fan is running, then lubricate the plastic parts inside the gearbox with Lithol or Solidol through the holes provided for this purpose.
- Check that there is 220 volts at the output from the on button of the switch.
Repair of fan motor
Repair of the electric motor with your own hands should begin with greasing the bearings, very often after that the fan begins to work normally. Motor shaft rotates in plastic bushings.
Lubrication is good with machine oil-drop a few drops of oil into the shaft at an angle so that it sinks into the bushing, then rotate the shaft back and forth along the axis until it begins to turn easily.
The probability of motor rotor failure is relatively small and in my practice of repairing household appliances so far has not met, because in the rotor is induced EMF (current arises) under the influence of the stator windings.
Household electric fan motors often have a breakage in one of the stator windings. If even one winding is broken then the motor will not run at all. To check it, just twist the blades sharply clockwise. Just take your hand away from the blades right away so you don’t get hurt.