When we are in a lot of places or homes to decorate a house, or when buying a house, we must first consider it carefully and observe whether they have installed a central air conditioner. But what is the central air conditioner? I think some friends may not know it yet. I will tell you about Xiaobian now. What are the introductions, working principles and installation of central air conditioners in our central air conditioner? What is the process?
Introduction of the first central air conditioner:
1. Classification and composition of central air conditioning The central air conditioning system has a main unit and an end system.
2. The medium used for the indoor heat and humidity load can be divided into the whole air system, the whole water system, the air-water system, and the refrigerant system.
3. According to the concentration of air treatment equipment, it can be divided into centralized and semi-centralized.
4. According to the source of the air to be treated, it can be divided into closed type, direct current type and mixed type (one return air secondary return air).
5. The main components include air conditioning main unit (cold heat source), combined air conditioning unit (wind cabinet), fan coil and so on.
6, in order to facilitate the use and maintenance, the host's cold and hot coal pipeline should be equipped with a cut-off valve, check valve, filter, balance valve, pressure gauge and thermometer.
7. A steam regulating valve and a steam trap are also provided on the steam line of the steam heater.
8. In order to ensure the normal operation of the surface heat exchanger, air discharge devices (such as vertical and horizontal exhaust valves) should be installed at the highest point of the water system, and drain valves and drain valves should be provided at the lowest point.
The working principle of the second central air conditioner:
1. The basic working process of a cold (hot) water unit is: an outdoor cooling (heat) unit cools (or heats up) the cold (hot) medium water.
2. The cooled (hot) water after cooling is sent to the fan coil unit installed indoors by the water pump, and the fan coil unit adopts the local return air to exchange heat with the indoor air to realize indoor air treatment. purpose.
3. The basic working process of the air duct (channel) type unit is: when cooling, the outdoor refrigeration unit absorbs the refrigerant vapor from the indoor unit and compresses and condenses it to deliver liquid refrigerant to each indoor unit.
4. When heating, the outdoor refrigeration unit absorbs the refrigerant vapor from the condenser and compresses it to deliver vapor refrigerant to each indoor unit.
5. The indoor unit draws in air through the return air vents placed on the ceiling, exchanges heat, and feeds them into the ducts (channels) installed in the ceiling of each room.
6. Air is delivered to each room in the room through a diffuser on the air outlet.
7. There are new dampers and exhaust doors on the air duct (dao), which can be replaced by a certain proportion to ensure the quality of indoor air.
The installation process of the third central air conditioner:
step one:
1. Central air-conditioning installation steps The most important thing to do at the beginning of the central air-conditioning is to install the internal machine. Pay attention when installing the internal machine. 2. The inner machine should not be less than 1 cm away from the roof to avoid vibration during the operation of the air conditioner and the top of the wall.
3. The internal machine should consider the slope of five thousandths when installing.
4. The side to which the condensate is connected should be installed slightly lower to prevent the condensed water from being discharged in time to cause the dripping of the indoor unit.
Step two:
1. After installing the internal machine, you can install the refrigerant copper tube. This link is the most important part of the central air-conditioning installation. You need to pay attention to installing the refrigerant copper tube.
2. The installation point of the refrigerant copper pipe is the connection between the copper pipe and the branch pipe, and welding is performed at this joint.
3. In the process of copper pipe welding, nitrogen must be installed inside the copper pipe. There is no air inside the copper pipe to avoid the phenomenon of carbon deposit inside the copper pipe during the welding process, which causes the compressor to malfunction during the working process. .
4. After the welding is completed, the high pressure nitrogen gas is used to carry out the soot blowing in the tube to keep the inside of the copper tube clean. At the same time, the copper tube should be pressure tested. The inside of the copper tube is filled with nitrogen to maintain pressure. The test time is generally 24 hours.
Step three:
1. The subsequent step of central air conditioning installation is the installation of the condensate pipe.
2. The condensate pipe should be kept at least >1% from the internal machine after installation to the outdoor and floor drain.
3. When the general installation is taken out from the indoor unit, it will be close to the ground, and it will be connected to other outdoor condensate pipes for outdoor or floor drain.
Step four:
1. Nitrogen-holding pressure This is a pressure test that must be performed on the copper pipe after the welding is completed. The copper pipe is filled with a certain pressure of nitrogen to maintain the pressure. The general pressure test time is 24 hours.
2. Special instructions are required: to use R410 refrigerant, the pressure inside the pipe should be 40 kg, and the R22 refrigerant should be kept at 20 kg.
3. Nitrogen is an inert gas with a small expansion coefficient and almost no pressure change due to thermal expansion and contraction.
4. If the pressure gauge drops during the test, you should check if there is a problem with the refrigerant pipe welding.
Step five:
1. The external machine is installed so that the air outlet of the external fan must have no obstruction within 50 cm.
2. All floor feet must be equipped with cushions to ensure normal operation of the outside machine.
Step six:
1. Vacuuming is required to evacuate the refrigerant pipe before filling the refrigerant after the external machine is installed.
2. Draw out the air inside the tube and keep the tube dry.
3, no moisture, otherwise air and water will mix with the refrigerant to produce ice crystals, which will seriously damage the equipment.
4. Specification: The refrigerant pipe needs to be connected to the external machine for operation.
5, the vacuum time is generally more than two hours online, one to one air duct machine is not less than 20 minutes.
Step 7:
1. After charging the refrigerant, after the above work is completed, the refrigerant valve can be opened to release the refrigerant that comes into the outside machine.
2. Start the test and check the pressure, and replenish it properly until the commissioning is completed and the ideal working condition is reached.
Step 8:
1. Air outlet measurement installation air return: The home central air conditioner usually installs the air return port and the inspection port.
2. The size of the tuyere must match the return air inlet of the internal machine, and there should be no misalignment.
3, in this way can achieve the best return air volume.
4. And ensure that there is enough maintenance space.
5, air outlet: the air outlet must not be installed near the light belt. Reason: If there is a light belt in front of the air outlet.
6, will cause the air conditioner to block the wind when heating, and the hot air is up, so that hot air stays in the upper part of the room.
7, so the entire activity space feels insufficient heat, it takes a long time to have a thermal feeling.
After reading all the above contents, did you understand what is the central air conditioner that Xiaobian said, and everyone knows how the central air conditioner works, and that we have mastered many processes of installing central air conditioners. In the future, if you still have something to know, such as the consultation on these decorations, you can ask the same as Xiaobian, pay attention to our decoration home network. This time the content is very long, thank you for your patience to read!
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