An article clarifies the pros and cons and installation of central air conditioning

An article clarifies the pros and cons and installation of central air conditioning

Multi-connection is what we call central air conditioning. One external unit can be connected to multiple internal units. One external unit with two internal units is called "one for two", even three is called "one for three", and so on. . The structure of the multi-line is more complicated than that of the split machine, and the cost is higher. With the same cooling capacity, the overall price of the multi-line is higher than that of the split machine. Duct machine is a kind of air conditioner between split machine and multi-line. It can be understood as one for one, and the price is cheaper than central air conditioner.

The internal unit of the central air conditioner is generally installed in the ceiling and does not take up floor space. The internal unit has air outlets and return air vents, so the air volume can be controlled smoothly and softly. The air-conditioning is no longer "sprayed" to the human body, which can relieve the temperature The sudden drop causes physical discomfort. This way of air outlet also determines that the noise of the air outlet is relatively small.

　　 In general, central air-conditioning is more suitable for houses with a larger area, a larger number of rooms, long-term temperature control in the room, and a room height that is not too low (hiding the internal unit requires a ceiling ≤30cm high).

The internal machine of the air duct machine is also hidden in the ceiling. If the budget is limited and you want to save area, you can also consider the "living room air duct machine + bedroom wall-mounted machine" solution. At least the living room no longer has a bulky vertical cabinet machine. .

1. How to choose central air conditioner

　　①Compressor-the core component of

　　It is the compressor that affects the refrigeration performance of the air conditioner, which is equivalent to the "heart" of the air conditioner.

　　 There are three types of compressors, reciprocating, rotor, and scroll. In the case of the same brand and power of the central air conditioner, the scroll type is more expensive than the rotor type, and the rotor type is more expensive than the reciprocating type.

　　②Power

　　 The power of the air conditioner is generally called "hp." The temperature control area is about 12 square meters.

A regular family with three bedrooms and one living room needs one tow four, and 6 is enough. If you want to tow five or more internal machines, you need a larger number of horses (as long as the number of external machines is large enough, as many internal machines can be towed), The number of horses generally has to leave a margin. If the number of horses is insufficient, the compressor will always work at full capacity.

③ Frequency conversion technology

　　Inverter is to make the air conditioner work at different frequencies, the main benefit is power saving.

　　 is divided into DC frequency conversion and AC frequency conversion. DC inverter motors have lower energy consumption and higher cost than AC inverter motors. It is reflected in the air conditioner that inverters are more expensive than non-inverters, and DC inverters are more expensive than AC inverters.

　　④refrigerant

　　 Freon is often used as a refrigerant. When it comes to Freon, one thinks of destroying the environment. In fact, Freon is a brand registered by DuPont. The ozone-depleting refrigerant is Freon R22. Now it is gradually replacing Freon R410A.

　　 2. Central air conditioning installation and maintenance

　　 There is a well-known saying in the air-conditioning industry: three-point product and seven-point installation. That is to say, the quality of the air conditioner is not the w* factor that affects the final temperature control effect of your z*. If the best air conditioner is not installed well, there will be problems such as poor cooling effect, large noise, water leakage and even life span.

　　①Installation steps

　　Because of the ceiling and pipeline layout, the installation of central air conditioning is much more difficult than ordinary air conditioning. At the beginning of the renovation, usually on the day when the water and electricity are disclosed, the person who installs the central air conditioner should negotiate the installation plan with the foreman, the water and electricity master and the designer.

After negotiation, based on the principle of "small pipes let big pipes", the central air conditioner should be installed first (if there is fresh air, z* install fresh air first, and the general fresh air pipe will be thicker than that of the central air conditioner), and lay gas and liquid pipes , Preset the power location, and then install the water and electricity pipelines.

▲Inner unit and ducts of central air conditioning

Start hoisting the internal unit first. The location of the internal unit should be considered as short as possible, because the longer the refrigerant flows in the pipe, the greater the loss; there should be a small distance between the internal unit and the roof to avoid the internal unit It resonates with the roof when working, which will damage the body and cause louder noise.

After the internal machine is hoisted, the pipes are laid out. The pipe paving diagram should be a drawing jointly decided by the central air-conditioning merchant, plumber and designer.

The pipes are generally copper pipes. Because the pressure of the refrigerant used now is relatively high, the welding requirements for copper pipes are relatively high (the internal machine with branch boxes almost does not need to be welded). If the pipe leaks, the compressor must increase its power. , The intuitive feeling is that the air conditioner is noisy when working.

　　After the pipeline is laid out, vacuum or high-pressure nitrogen should be taken to check the welding quality of the pipeline. Install the outdoor unit after the pipes are laid. The outdoor unit should be installed in a well-ventilated place with no obstructions within one meter.

　　 Finally, install the air outlet, return air outlet and fluorine filling test. The location of the air outlet should avoid the bedside or sofa, combined with the layout of the indoor furniture and the design of the light trough, as far as possible to maximize the advantage of the soft air of the central air conditioning.

　　 The general return air method is "measure the next return", that is, the side air outlet, the bottom return air, the air outlet and the return air outlet should not be too close to avoid "short circuit" of the air path.

▲Next time

The tuyere is generally made of aluminum alloy shutters, which is sturdy and durable, but there may be dripping from the tuyere, usually white. If you want to make other colors, you usually need to add money; there are also ABS plastic or wooden tuyere, which is not easy to drip, and there are many shapes and colors. Ceiling style to choose.

In addition to the air outlet and return air vent, remember to leave an inspection hole (the return air vent is often used as a maintenance port. In the early design, remember not to block the return air vent with furniture such as wardrobes). Otherwise, when maintenance is needed, only The ceiling can be removed.

▲The return air port is often used as a maintenance port

　　 Pay attention to ask if the brand’s installation team is professional and reliable. Nowadays, most mainstream brands in China are installation outsourcing, and you need to directly connect with the installation master to coordinate the relationship.

▲Welding copper pipe

　　②Installation price

　　The installation fee is generally included in the total price of the central air conditioner. The installation fee and accessories generally account for 20-30% of the total price.

　　 If the installation is outsourced, the price varies from place to place. The installation fee for most home improvement central air conditioners is between 1400 and 1500 yuan. The tooling is different, it depends on the material of the copper pipe.

If you install an air conditioner extension pipe, the price of the extension pipe is about 110 yuan per meter; if you want to buy a full set of air conditioner connecting pipes, the price is 300 yuan per set; if you want to buy copper pipes directly, the copper pipes are sold by weight and the price is Around 55 yuan per kilogram. Of course, the specific situation needs to be analyzed in detail, these are only for reference.

　　③Post-maintenance

　　 Simple cleaning of the air outlet can be done by yourself, as long as the power is turned off, the shutters can be removed and cleaned.

　　 These cleanings can be operated at the access opening. If the internal machine is replaced, or there is a problem with the welding of the copper pipe, the ceiling must be removed.