Split duct piping

As we know, one of the new and widely used air conditioning equipment that is used for cooling and heating the space inside residential, commercial, office, etc. is split duct or channel split. Split ducts are in two pieces and consist of an internal unit (evaporator) and an external unit (condensing unit). The installation of split duct is done in several stages and one of the main stages affecting its performance is the piping stage, which we will examine in this article. In general, split duct piping is done for three purposes, which are:

• providing the refrigerant gas path between the external unit and the internal unit (copper piping)
• Transferring hot water in the device's heating coils
• Discharge of distilled water (drain piping)

Copper piping

The transfer of the refrigerant between the internal unit (evaporator) and the external unit (condensing unit) is done through two copper pipes. One of the pipes is the suction pipe, which has a larger diameter, and the other pipe is the discharge pipe, which has a smaller diameter, and both pipes are insulated to prevent energy loss.
The size of the pipes is determined according to the capacity and the announcement of the manufacturer of the device. If we use a size smaller than the standard, we will face a pressure drop and a decrease in the performance of the device. Also, if larger size pipes are used, there will be problems such as reducing the speed of refrigerant flow and returning oil to the compressor. In both cases, pressure will be applied to the compressor and its lifespan will decrease.
The thickness of these pipes is determined according to their size and the working pressure of the device. The thickness of the refrigerant flow copper pipes in inverter devices is considered greater than the thickness of the copper pipes used in the normal type because these devices work at a higher pressure.
The copper pipes that are used are soft copper pipes and are easily bent, but it should be carefully done by a technician with a bending machine. Otherwise, the pipes may be split and crack and leak after installation. Also, the beginning and end parts of the copper pipes should be blocked so that, in addition to preventing the entry of moisture and small foreign particles, they can be used to test the pipes for leakage (nitrogen injection).

Piping based on standard

Basic and standard piping in duct splits is not only very effective in increasing the performance of the device in different parts of the split duct (compressor, condenser and coil), but it will also reduce the depreciation of these parts. Therefore, due to the specialization of duct split plumbing, it requires sufficient knowledge and experience and must be done by professional and expert installers. Otherwise, it will reduce the performance and damage the device.

Allowed length of piping between inner and outer panel

In split duct piping, it is very important to observe the horizontal and vertical distance between the internal panel and the external unit of the device. Because failure to comply with the maximum permissible length of piping will lead to a decrease in efficiency and problems in the operation of the device. The maximum permissible length of piping in duct splits is determined based on the capacity and brand of the device and is specified and included in the product catalog. But in general, the permissible length of piping (vertical and horizontal) between two panels is between 10 and 30 meters based on the power of the compressor and the capacity of the device.
In air conditioning equipment such as split duct, sometimes some oil along with gas comes out of the compressor and enters the pipes. Under normal conditions and if the indoor unit and outdoor unit are at the same level, this oil returns to the crankcase in the compressor. But if the indoor unit is installed at a lower height than the outdoor unit (for example, the outdoor unit is installed on the roof), the oil return will be difficult and will accumulate in the evaporator. For this reason, to prevent this problem, a number of oil traps or oil traps should be installed in the vertical pipes.

Pipe leakage test

It should be noted that checking the non-cracking, double widening of the sides of the copper pipes at the place of pipe bending and pipe seams are important things that should be paid attention to before starting the device. For this purpose, before starting the split duct, pipelines should be tested under the pressure of nitrogen gas so that, if necessary, its leakage can be removed. Otherwise, the device will experience a pressure drop in the compressor and abnormally discharge the refrigerant gas.

Coil hot water piping

As you know, split ducts are used for cooling and heating the environment, and heating is done in the winter season by the device's spa coil. For this purpose, the return and return pipes of the spa should be run from the engine room or the package of each unit to the spa coil of the device. These pipes should also be insulated to prevent energy loss.

Drain piping

In addition to the piping of the refrigerant gas in the split ducts, which is done by copper pipes, another piping is needed to drain the water from the condensed moisture of the air on the evaporator coil of the device, which is called the drain piping. . The drain piping must be in the direction of the distilled water discharge and have a suitable slope from the tray under the refrigeration coil, otherwise it will not drain well. This pipe should not be discharged directly into the sewer network and should have a suitable air gap.

Duct Split Piping Cost

As it was said, the piping routes of each split duct include 3 sections of refrigerant, heating coil and draining device, and respected employers usually have questions about the overall cost of piping.
The cost of purchasing material and doing triple piping of split ducts varies based on the distance between the inner and outer panels, the capacity of the device and the diameter of the required pipes, the type and material used in the work and other operational factors, but approximately It is easy to consider about 20 to 25% of the total cost of buying a split duct for these pipes.

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final word

In this article, we tried to talk about split duct plumbing and we hope that we have provided useful information in this regard.
You can visit the website of Dematajhiz specialized collection (the first and most reliable specialized collection of building facilities equipment and all air conditioning devices) to view and compare different types of air conditioning and heating equipment with different brands and capacities, as well as to know the updated price of the products. 1383 and having 3 valid business licenses) refer.
In order to get more information and get advice, you can contact the experts of Dematjhiz during office hours.

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