Installation steps of central air conditioning What are the precautions for the installation of central air conditioning?

Central air conditioning is a kind of electrical equipment, which will be installed in many large occasions. Compared with ordinary air conditioners, central air conditioners have greater horsepower and wider coverage. Basically, every large shopping mall, school and other public facilities will be equipped with central air conditioning. So, what are the installation steps of central air conditioning? What are the precautions? Now Bian Xiao will introduce the installation steps of central air-conditioning and the matters needing attention in installing central air-conditioning.

Installation steps of central air conditioner

1. Internal machine in place:

The first step for the construction team to enter the site is to hoist the internal machine. Here, as long as you pay attention to two points, you can avoid subsequent problems.

A: The distance between the internal machine and the roof shall not be less than 1cm, so as to avoid vibration with the wall roof when the machine is running.

B: When hoisting the inner machine, the slope of five thousandths should be considered, and the side connected with the condensed water should be slightly lower to avoid the condensed water from being discharged.

2. Installation of refrigerant copper tube:

After installing the indoor unit, the refrigerant copper pipe can be installed, which is the most important link in the installation process of central air conditioning.

A: All welding points should be the joints of copper pipes and bifurcated pipes, and there is no welding between copper pipes.

B: During the welding process, nitrogen must be injected into the copper tube (nitrogen-filled welding process) so that there is no air in the copper tube, which avoids the occurrence of welding and coking on the inner wall, thus leading to the failure of the compressor in formal operation.

C: After welding, high-pressure nitrogen should be used for soot blowing in the pipe to keep the copper pipe clean.

3. Nitrogen charging and pressure maintaining:

This is a pressure test that must be carried out on the copper pipe after welding is completed. The copper tube is filled with nitrogen at a certain pressure to maintain the pressure, and the general pressure test time is 24 hours.

Special attention: When using R4 10 refrigerant, the pressure in the pipe should be kept at 40 kg, while R22 refrigerant should be kept at 20 kg.

Nitrogen is an inert gas with a small expansion coefficient, and it hardly changes pressure due to thermal expansion and cold contraction. If the pressure gauge drops during the test, check whether there is any problem with the welding of the refrigerant pipe.

4. Installation of condensate pipe:

After the condensate pipe is taken out of the indoor unit, it will be discharged to the outdoor or floor drain with a slope of at least: 1%. The installation with higher quality is taken out from the indoor unit, landed nearby, and finally taken out from the outdoor or floor drain together with other condensate pipes.

5. Install the external machine:

Ensure that the fan outlet of the external machine is free of obstacles within 50 cm, and all landing feet must be equipped with shock absorbers to ensure the normal operation of the external machine.

6. vacuumizing:

After the installation of the external machine, before filling the refrigerant, the refrigerant pipeline must be vacuumized to extract the air from the pipeline and keep the pipeline dry and moisture-free, otherwise the air and water will mix with the refrigerant to produce ice crystals, which will seriously damage the equipment.

Specification: The refrigerant pipeline needs to be connected to an external machine before it can run; Generally, the vacuumizing time is not less than two hours, and the ventilator is not less than 20 minutes.

7. Filling refrigerant:

After the above work is completed, you can open the refrigerant valve, release the self-contained refrigerant in the outdoor unit, start the machine test and pressure detection, and replenish it appropriately until the debugging is completed and the ideal working condition is reached.

8. Installation of tuyere measurement:

Air return port: Home central air conditioning usually installs air return port and maintenance port together, and the size of air return port must be consistent with the air return port of internal machine, so as to achieve the best air return volume. And make sure there is enough maintenance space.

Matters needing attention

When installing the fan coil in the indoor unit of the central air conditioner, it should be wrapped to avoid dust and impurities from entering.

Protect the refrigerant pipe joint when installing the exhaust pipe.

Above, Bian Xiao introduced the steps of installing central air conditioning for you in detail. There are eight main steps in the installation of central air conditioning. So many steps have their corresponding operation methods, so it is not a very simple thing to install central air conditioning. Bian Xiao also introduced the matters needing attention in installing central air conditioning. There are two points that consumers need to pay more attention to. Generally speaking, the installation of central air conditioning needs professionals to install it. I hope Bian Xiao's introduction can help everyone.

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