This is the "3 times", "8 steps" and "5 keys" of central air conditioning installation~~ It is not an exaggeration to say that the central air conditioner is installed with 3 points and 7 points for quality. The central air conditioner needs to be properly matched with the interior decoration. In fact, the equipment itself is only a "semi-finished product". It is necessary to make a set of household central air conditioners work normally, design, install, and construct The importance is no less than the quality of air conditioning equipment. Next, introduce the central air conditioning installation 3 times, 8 steps and 5 keys. 1. Installation phase: central air-conditioning has to be installed 3 times 1 First installation [Contact installation when water and electricity enter the site] ◆ Hoist the central air conditioner indoor unit and wrap it to avoid dust and impurities from entering; ◆ Install pipes: refrigerant pipes, condensate pipes, signal lines. 2 second installation [24 hours later] ◆ Hoisting the outdoor unit of central air conditioner; ◆ Fill the refrigerant, test the central air conditioning system, and measure the size and position of the air outlet. 3The third installation [after the second installation or the next day] ◆ Install the tuyere, and finally test the operation of the equipment; 2. Installation materials: 5 key auxiliary materials should not be neglected 1 Refrigerant copper pipe: ◆ The operating condition of the refrigerant in the central air conditioner directly determines the effect of use, so the quality of the refrigerant copper pipe is very important. The pressure inside the tube of traditional R22 refrigerant (freon) is generally about 20 kg, while the pressure inside the tube of R410A refrigerant reaches 36 kg. Therefore, the use of R410A refrigerant requires the choice of better quality refrigerant copper tubes.
Copper pipes (commonly known as extruded pipes) produced by the extrusion process have uniform wall thickness and can withstand higher pressures. Another common type of copper tube on the market is produced by a drawing process (commonly known as a drawing tube), which is prone to uneven wall thickness, which poses a hidden danger to the safety of the refrigerant system. 2 Copper pipe insulation: ◆ The operation of the refrigerant directly determines the effect of the use, and the copper pipe insulation cannot be ignored.
3 Condensate pipe: ◆ The condensate pipe is hidden in the ceiling and will be closed at the end. Although the quality of the air conditioner is not good or bad, if it leaks, the consequences are serious. It must be repaired by removing part or all of the suspended ceiling or even knocking on the wall to pry the floor (brick). 4 air outlet: ◆ There are two kinds of materials for common tuyere: one is ABS tuyere and the other is aluminum alloy tuyere. Both tuyere has advantages and disadvantages. ◆ ABS air outlet: It is made of ABS engineering materials and is not easy to condense. However, the material has a certain coefficient of thermal expansion and contraction, so it may squeak during use, and the air outlet may also be slightly arched when the temperature is low in winter. The tuyere will turn yellow after prolonged use and it is not easy to clean.
Aluminum alloy tuyere: The advantage is that it is not easy to deform or discolor. However, because the heat transfer rate of aluminum alloy is very fast, it is easy to condense during summer use. In severe cases, water droplets will be produced. ◆ Here, by the way, let’s talk about the problem of air-conditioning vent condensation. I believe that the vent condensation has troubled many people, including technicians. Come, click this --> Why does the air-conditioning vent condense? What to do? 5 signal line: ◆ Signal cables are not expensive, and shielded signal cables are generally used. You can rest assured in this area. Installation specifications: 8-step installation, step by step specifications need to be in place 1 Inside machine is in place: ◆ The first step for the construction team to enter the site is to hoist the internal machine. As long as you pay attention to two points, you can avoid subsequent problems.
◆ The distance between the internal machine and the roof of the house shall not be less than 1 cm to avoid resonance with the wall when the machine is running. ◆ The internal machine must be hoisted and in a horizontal position. After installation, special tools need to be used to measure whether the machine is level. 2 Installation of refrigerant copper pipe: ◆ The refrigerant copper pipe can be installed after installing the internal unit. This is the most important part of the central air-conditioning installation process.
◆ All welding points should be welded between the copper pipe and the branch pipe, and there is no copper pipe and copper pipe welding. After welding, high-pressure nitrogen should be used to blow soot inside the tube to keep the copper tube clean. ◆ Nitrogen must be flushed into the copper pipe during the welding process (nitrogen-filled welding process). This makes the copper pipe no air and avoids welding and carbon build-up on the inner wall, which may cause malfunctions when entering the compressor during official operation. 3 Fill nitrogen to maintain pressure: This is a pressure test that must be performed on the copper pipe after the welding is completed. A certain pressure of nitrogen is filled into the copper pipe to maintain the pressure. The general pressure test time is 24 hours. ◆ Special instructions are required: the use of R410A refrigerant requires a pressure holding tube pressure of 41 kg, and R22 refrigerant requires a pressure holding tube pressure of 28 kg.
◆ Nitrogen is an inert gas with a small expansion coefficient, and there is almost no pressure change due to thermal expansion and contraction. If the pressure gauge drops during the test, check whether there is any problem with the welding of the refrigerant pipe. In order to ensure that the installation and construction are in place, all pressure gauges will not be dismantled after the regular pressure maintaining for 24 hours to ensure the safe operation of the refrigerant system. 4 Installation of condensate pipe: ◆ After the condensate pipe is connected from the internal machine to the outdoor or floor drain, maintain at least a slope of >1%.
◆ For higher-quality installations, after connecting from the indoor unit, land nearby, and finally connect to the outdoor or floor drain together with other condensate pipes.
5 Install the outside machine: ◆ The air outlet of the outdoor fan must be within 50 cm and 15 cm from the rear of the outdoor unit without obstruction, and all floor feet must be equipped with shock absorbers to ensure the normal operation of the outdoor unit.
6 Vacuum: ◆ After the external unit is installed, the refrigerant tube needs to be evacuated before the refrigerant is filled, and the air in the tube must be evacuated to keep the tube dry and free of moisture. Otherwise, the air and water will mix with the refrigerant to produce ice crystals, which may cause serious equipment damage.
The higher-quality installation is to connect from the indoor unit and land nearby, and finally connect to the outdoor or floor drain together with other condensate pipes. 7 Filling refrigerant: ◆ After the above work is completed, you can open the refrigerant valve to release the refrigerant in the external machine, start the test and check the pressure, and make appropriate supplements until the debugging is completed and the ideal working state is reached.
8 air outlet measurement installation: ◆ Normally, the return air inlet will be installed together with the inspection opening. The size of the air outlet must be consistent with the return air outlet of the internal machine, and there should be no misalignment, so as to achieve the best return air volume and ensure sufficient maintenance space.
◆ For the air outlets that are embedded or recessed in the ceiling, please pay attention to check whether the ceiling is completed. If there are cracks in the ceiling, causing air leakage, it will cause a short circuit of the air flow. The wind has not reached the use area and has returned to the air conditioner. Affect the use effect. If the lower return air/side return air mode is used, the distance between the air outlet and the air return is 1.2 meters.
