Eight installation steps of central air conditioning

Eight installation steps of central air conditioning

The installation and purchase of central air conditioners are equally important. Central air conditioners have good materials and without good construction techniques, which will also affect the use of air conditioners, and air conditioners are easily damaged. This requires us to be careful every step of the central air-conditioning installation, and the eight major steps to the correct installation of central air-conditioning cannot be ignored.

　　1, the internal machine is in place

　　 The first step for the construction team to enter the site is to hoist the internal machine. Just pay attention to two points to avoid subsequent problems. The distance between the inner machine and the roof should 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

　　After installing the internal unit, you can install the refrigerant copper pipe, which is an important part of the central air-conditioning installation process. All welding points should be welded between the copper pipe and the branch pipe. There is no copper pipe and copper pipe welding. 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. After welding, high-pressure nitrogen should be used to blow soot inside the tube to keep the copper tube clean.

　　3, Nitrogen filling to maintain 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. Special note: The use of R410 refrigerant needs to maintain the pressure in the tube at 40 kg, and the R22 refrigerant needs to maintain the pressure in the tube at 20 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, you should check whether there is a problem with the welding of the refrigerant pipe. Special requirements: In order to ensure that the installation and construction are in place, all pressure gauges are not removed after the normal pressure is maintained for 24 hours. They are not removed until the external machine is energized and tested. (In order to avoid accidental damage to the refrigerant system during other decoration and construction), the refrigerant system can be fully guaranteed Safe operation.

　　 4. Installation of condensate pipe

　　 After connecting the condensate pipe from the internal machine to the outdoor or floor drain, maintain at least a slope of >1%. High-quality installations are connected to the indoor unit and landed nearby. After it will be connected to the outdoor or floor drain together with other condensate pipes.

　　 5. Central air-conditioning installation outside machine

　　 The air outlet of the outdoor fan must be within 15 cm of the rear of the 50 cm internal and external unit without obstructions, 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 will cause serious damage to the equipment. Specification: The refrigerant pipe needs to be connected to the external machine for operation; the time for vacuuming is generally not less than two hours, and the one-to-one air pipe machine is not less than 20 minutes.

　　 7. Filling with 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. Tuyere measurement installation

　　 Return air vent: Usually, the return air vent will be installed together with the maintenance opening. The size of the air vent must match the return air vent of the internal machine, and there should be no misalignment, so as to achieve the best return air volume of z*; and ensure that there is enough maintenance space.

　　 Air outlet: If ABS air outlet is used, there must be a certain space for thermal expansion and contraction when measuring the air outlet. Please also note that the air outlet must not be installed near the light strip (reason: if there is a light strip in front of the air outlet, it will cause the air conditioner to block the wind when heating, and the hot air will go up, making the hot air trapped in the room. The upper part, so the whole activity space feels insufficient heat, it takes a long time to feel the heat.)