Installation skills and precautions for branch pipes, you absolutely need!

Installation skills and precautions for branch pipes, you absolutely need!

Nowadays, the household goods on the market are also dazzling. Every different item needs a channel to connect. As some channels that can connect, there are also many types. Branch pipe, that is, central air-conditioning branch pipe, branch device, branch device. As the name suggests, it is a pipe with one input but multiple outputs. Mainly used in the pipeline installation of the central air-conditioning VRV system. Its function is to divert the refrigerant in the pipeline to the indoor unit in the central air-conditioning multi-line installation system. So what are the installation skills and precautions for branch pipes? Let's take a look together!

Installation skills and precautions for branch pipes, you absolutely need!

　　 1. Introduction of branch pipe

The branch pipe is made of high-quality copper pipes. Our common refrigerators and various refrigeration appliances require copper pipe connections to achieve the cooling effect. Therefore, the central air-conditioning fluorine machine installation also uses the copper pipe connection to achieve this cooling effect. Yes, and the branch pipe is to connect these copper pipes to each indoor unit. It can be seen that the branch pipe is very important for the installation and operation of central air conditioning. Its function simply means that it is connected to the copper pipe to connect each indoor unit, so that the refrigerant can circulate in the copper pipe to achieve the effect of cooling and heat exchange.

Installation skills and precautions for branch pipes, you absolutely need!

　　 2. Selection criteria for branch pipe

　　The branch pipe is made of copper pipes, which is processed and welded, and its selection is also very important.

　　 R410A refrigerant is mainly used now. This refrigerant is more environmentally friendly than traditional refrigerants and has better cooling effect. However, its pressure is also higher than that of traditional refrigerants. If it is not selected properly, it may leak and burst after installation. Cause a lot of losses to the central air-conditioning system, causing unnecessary trouble.

　　 Selection criteria:

1. Look at the material of the copper tube: the quality of the copper tube directly determines the quality of the branch pipe. Now the central air conditioner mainly uses R410A refrigerant, which has a high pressure. The branch pipe processing also needs to use R410A special copper pipe, which is better than ordinary copper. The thickness of the tube should be thick, and the pressure is large.

　　2. Look at the thickness of the branch pipe: the thicker the thickness, the greater the pressure, so when choosing the branch pipe, look at the thickness first.

　　3. Look at the welding point: the branch pipes are all welded, and the welding place is also the most prone to problems. The welding problems are mainly sand holes, desoldering, and oxides. A good branch pipe should have clean pipe walls, no impurities, and no black spots.

　　 Three, the installation method of the branch pipe

Knowing the principle of central air-conditioning refrigeration will know that there are two copper pipes connecting the indoor unit, one for circulating gas and the other for circulating liquid. Therefore, the branch pipe is generally divided into gas pipe and liquid pipe, also called big pipe and small pipe. As the name suggests, the air pipe takes gas. , The relative gas flow area is much larger than that of liquid, so the gas pipe is also a big pipe, and the liquid pipe is for liquid, so a small pipe can be used.

Installation skills and precautions for branch pipes, you absolutely need!

　　 The installation of the branch pipe is very important for the operation of the central air-conditioning multi-line system. On the basis of the correct selection of the branch pipe, the installation specifications of the branch pipe should be followed:

　　 Branch pipe connection: the inlet is connected to the outdoor unit or the previous branch, and the outlet is connected to the indoor unit or the next branch.

1. Before installation: Before installation, check whether the diameter of the copper pipe is the same as the diameter of the required branch pipe. If the size of the copper pipe at the installation site is different from the diameter of the required branch pipe, use a cutter to divide the different parts. Note: Choose the same caliber to cut off.

　　2. Placement: When installing the branch pipe, try to place the branch pipe vertically or horizontally. When placed horizontally, the inclination is within ±15°. After placing it correctly, fill in nitrogen for welding.

　　3. Note: For the branch pipe multi-channel system, each pipe is labeled to make the connecting pipe after the branch correspond to the indoor unit to prevent wrong connection.

　　4. Purge: Purge is to use nitrogen pressure to remove impurities in the tube. (Mainly dust, moisture, oxide caused by welding, etc.)

　　 Fourth, the installation precautions of the branch pipe

　　The branch pipe is installed horizontally. When installing, pay attention to the following items:

　　 1. The distance between the front and back bends is too close

　　 The distance between the branch pipe and its front and back bends is too close, which will also affect the normal diversion of the refrigerant flowing there, and affect the cooling effect of the downstream indoor unit. Therefore, it is necessary to ensure that the distance between the branch pipe and its front and rear bends is above 500mm. Similarly, the distance between the two elbows (bending points) must be more than 500mm; the two branch pipes must also be

　　 Follow the same principles for installation.

　　2, the pipeline direction is too complicated

On the first floor of the villa, the direction of the divergence of the main pipe from the tube well is too complicated. Some pipes even go to one end and then fold back. This wastes materials on the one hand, and mainly increases the pipe resistance and reduces the cooling of the indoor unit. Ability; some pipelines are laid in layers, which is not conducive to the normal oil return of the system, which will leave hidden dangers to the normal operation of the main engine. Regarding the design and laying of pipelines, please follow the principle of "the length of the pipeline is as short as possible and the use of elbows as few as possible", otherwise it will affect the normal operation of the unit in the future, and even damage the unit, so it must be changed.

　　3, the outlet pipe does not retain a certain straight section

During the spot check of some engineering installations, we found this problem: the branch pipe branch did not retain a certain straight pipe section, but was immediately bent after branching, which will cause a lot of problems for the indoor unit behind the branch pipe. influences.

　　4. Welding of branch pipe

In the actual engineering maintenance, we found that the last two A and B of a set of 12 multi-connected indoor units. When A is turned on, the cooling effect of B is poor. If A is not turned on, then B is good, so we put the last one The branch pipe and the pipeline connected to B were all removed, and the suspicious pipeline was cut open to find the condition. After the shortened insertion depth treatment, the unit is operating normally.

　　 After reading the above content, everyone should have a certain understanding of branch control. I hope that through the detailed analysis of okmarts.com editor, you can use the techniques we have guided when installing common branch pipes by yourself in the future, and can provide you with some help.