Fan coil unit, also known as the terminal equipment of central air conditioner, is mainly composed of low-noise motor and coil unit. The fan cools or heats the indoor air or outdoor mixed air through the surface cooler and sends it into the room to lower or increase the indoor temperature to meet people's comfort requirements. However, there are many dust particles in the atmosphere. Under the action of long-term pumping and returning air, the aluminum fins of the fan are full of dust and dirt. Today, let's take a look at the fan coil cleaning method and common troubleshooting, hoping to help you.

After the central air conditioner has been used for a period of time (generally 1-2 years), it is necessary to clean the aluminum fins of the fan. The process of cleaning the aluminum fins of the fan must first disassemble the fan motor and impeller, and you can check whether the motor and capacitor are burned out. examine. When cooling in summer, because there is a lot of condensed water, when the tray flows into the condensed water drain pipe, it is easy to produce bacteria clusters and algae, which will block the condensed drain pipe. Therefore, the tray should be cleaned, sterilized and algae-killed.

After cleaning the water collection tray of the fan coil unit, carry out disinfection and sterilization and dredge the condensate pipe. Regularly place fan coil unit disinfection and sterilization sheets on the fan coil unit water collection tray to prevent pipe blockage due to the reproduction of bacteria and algae. At the same time, disassemble, wash and remove dust from the fan coil fan impeller, volute, motor, shaft, etc. After the fan coil unit is cleaned, the ventilation volume increases, the central air-conditioning effect is good, the indoor air quality is good, the noise is reduced, the electricity bill is reduced, and the condensation water is smooth.
It mainly includes maintenance, cleaning (scale removal, sterilization, algae removal of fan coil surface cooler), maintenance of fan coil and air inlet and outlet. The specific cleaning process is as follows: 
1. Cleaning, sterilization and disinfection of the return air outlet filter
2. Sterilization and disinfection of the air supply system
3. For the fan coil surface cooler, use a special central air-conditioning cleaning agent to clean, descale and sterilize. Keep the ventilation smooth
4. Clean the coil fan impeller, volute, and motor dust, and refuel the motor shaft
5. Connect the water tray and filter to remove sludge and sundries, clean them, and keep the water flowing smoothly
6. The cleanliness of the air grille in and out
7. Check that the water pipe is firmly connected
8. Check whether the insulation is good
9. Check whether the valve is leaking
10. Do not install fluorescent lamp facilities under the fan coil unit



Cleaning program
1. Remove the air return baffle and the dust filter, and wash the filter with a high-pressure water gun to prevent the filter from being stained with mud and dust
2. Correctly remove the fan roller and its impeller in front of the fan
3. Check whether the fan motor, capacitor, etc. are burnt out. If normal, clean the impeller and roller shell with a brush
4. It is non-corrosive to aluminum fins, but can remove dust and dirt. Spray the fin water on the aluminum fins with a high-pressure cleaner, let it work for 5 minutes, and then rinse the fins with a washing machine
5. After cleaning the aluminum fins (you can see 2-3 rows of small copper tubes in the fins), install the fan motor and impeller in front of the fan coil unit correctly to restore them completely
6. Clean the condensed water tray and add three sterilizing and algae-killing tablets
7. Put the cleaned dust filter and baffle back in place
8. Disassemble the Y-type filter of the fan coil unit for cleaning
 
Instructions: Open the screw cap of the Y-shaped filter, use a container to collect water, and take out the filter screen. Open the chilled water outlet valve, use the return water pressure to recoil the dirt from the cooling coil until clear water comes out, then close the water outlet valve, put the cleaned filter into it, and close the screw cap.

Several situations and solutions for the fan to rotate but no wind
1. The position of the air supply is not appropriate, it should be adjusted to a suitable gear
2. The filter has too much dust and should be cleaned
3. The fins of the coil have too much dust and should be cleaned
4. The voltage is low, the reason should be found out
5. If the fan is reversed, the wiring sequence should be changed

The blown air is not cold/hot enough and the solutions
1. The temperature gear is not set properly, it should be adjusted to a suitable gear
2. If there is air in the coil, it should be discharged by opening the air release valve of the coil
3. The temperature of the water supply is abnormal, and the cold and heat sources should be checked
4. Insufficient water supply, the large water valve should be opened or the diameter of the branch pipe should be enlarged
5. The fins of the coil are oxidized, the coil should be replaced

Several situations and solutions for excessive vibration and noise
1. If the fan bearing is lubricated or damaged, add lubricating oil or replace it
2. Too much dust or damage to the fan blades should be cleaned or replaced
3. There is friction between the fan impeller and the casing, the friction should be eliminated or the fan should be replaced
4. The air outlet and the external air duct or air supply port are not softly connected, so a soft connection should be used
5. The coil and drip tray are not softly connected to the water supply and return pipes and drain pipes, so soft connections should be used
6. If the fan coil unit is running at high speed, it should be adjusted to medium and low speed.
7. The connecting parts of the fixed fan are loose and should be tightened
8. The louvers of the air supply outlet are loose and should be tightened

Several situations and solutions of water leakage
1. Leakage of the drip tray: (1) It may be that the drain (pipe) is blocked, and it should be dredged by suction, ventilation, blowing, flushing, etc. (2) If the water cannot be discharged or the drainage is not smooth, the slope or diameter of the drain pipe should be increased
2. The drip tray is tilted and should be adjusted so that the drain is at the lowest
3. The air release valve is not closed, it should be closed
4. The pipe joints are not tightly connected and should be tightly connected

There are several situations and solutions for foreign matter blowing out
1. The filter screen is damaged and should be replaced
2. There is too much dust in the unit or air duct, it should be cleaned
3. The surface of the fan blades is corroded, the fan should be replaced
4. The coil fins are oxidized, the coil should be replaced
5. If the insulation material inside the unit or the air duct is damaged, it should be repaired or replaced

Several situations and solutions of condensation on the casing of the unit
1. If the thermal insulation material inside the unit is damaged and separated from the inner wall, it should be repaired or pasted.
2. If the casing is damaged and leaks air, it should be repaired

Several Situations and Solutions of Unsmooth Drainage of Condensed Water
1. The horizontal slope of the external pipeline is too small, and the slope should be adjusted to ≥8%
2. The external pipe is blocked and should be dredged

Several situations and solutions for drip tray condensation
1. The insulation layer at the bottom of the drip pan is damaged or separated from the bottom of the pan, it should be repaired or pasted