The central air-conditioning copper pipe is the medium of air-conditioning and heating transmission, which is equivalent to the connection of human blood. Fluorine system household central air-conditioning copper pipes are divided into ordinary copper pipes and R410a copper pipes. The copper tubes used in traditional R22 refrigerant air conditioners are ordinary copper tubes, and the copper tubes used by R410a refrigerant air conditioners are R410a copper tubes. At present, fluorine system frequency conversion multi-connected household central air-conditioning host mostly uses R410a refrigerant, so in the multi-line application of fluorine system, R410a copper pipe is the most.

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Piping size between divergent part and divergent part

R22 Refrigerant System



Total indoor unit capacity

Air ducts:mm

Liquid tube:mm

C≤80

Φ15.9

Φ9.52

80<C≤180

Φ19.05

Φ12.7

180<C≤224

Φ25.4

Φ12.7

224<C≤335

Φ28.6

Φ12.7

335<C≤504

Φ34.9

Φ15.9

504<C≤784

Φ41.3

Φ19.05

784<C≤1005

Φ41.3

Φ22.2

1OO5<C≤135O

Φ54.1

Φ22.2

1350<C≤1500

Φ63.5

Φ25.4

1500<C≤1800

Φ69.9

Φ25.4



Indoor unit piping size

R22 System

Indoor unit capacity

Air ducts:mm

Liquid tube:mm

C≤25

Φ9.52

Φ6.35

25<C≤36

Φ12.7

Φ6.35

36<C≤50

Φ12.7

Φ6.35

50<C≤80

Φ15.9

Φ9.52

80<C≤140

Φ19.05

Φ12.7



Y-type divergent tube

R422 System

Total indoor unit capacity

Model

Y-type divergent tube

C≤90

FQ01A

90<C≤l80

FQ01B

180<C≤335

FQ02

335<C≤784

FQ03

784<C≤1350

FQ04

1350<C

FQ05



Piping size between divergent part and divergent part

R410 Refrigerant System

Total indoor unit capacity

Air ducts:mm

Liquid tube:mm

C≤56

Φ12.7

Φ6.35

56<C≤142

Φ15.9

Φ9.52

142<C≤220

Φ19.05

Φ9.52

220<C≤300

Φ22.2

Φ9.52

300<C≤450

Φ28.6

Φ12.7

450<C≤670

Φ28.6

Φ15.9

670<C≤950

Φ34.9

Φ19.05

950<C≤1350

Φ41.3

Φ19.05

1350<C≤1600

Φ44.5

Φ22.2

1600<C≤2100

Φ54.1

Φ25.4



Indoor unit piping size

R410 Refrigerant System

Indoor unit capacity

Air ducts:mm

Liquid tube:mm

22、 25、 28

Φ9.52

Φ6.35

36、 40、 45、 50

Φ12.7

Φ6.35

56、 63、 71、 80、 90、 100、 112、 125、 140

Φ15.9

Φ9.52



R410 Refrigerant System

Total indoor unit capacity

Model

Y-type divergent tube

C≤20

FQ01A

20<C≤300

FQ01B

300<C≤700

FQ02

700<C≤1350

FQ03

1350≤C

FQ04



R410A copper pipe, R22 copper pipe

Figure 1: R410A copper pipe, R22 copper pipe

  

Since the pressure generated by R410a refrigerant is 1.6 times that of R22 refrigerant, this requires its copper tube to have high density, strong pressure resistance, high copper tube cleanliness and uniform copper tube wall thickness, so the air conditioning system of R410a refrigerant must Use special R410a copper tube.

  In the system installation, we can use R410a copper tube instead of ordinary R22 copper tube, but we must not use ordinary R22 copper tube to replace R410a copper tube. Many consumers value the overall project price very much. The lower the better, they neglect the importance of installation materials and installation techniques. This often leads some engineering companies to rush to get orders and ignore the quality of the later customers’ use of the project. Replacement in order to save costs to meet customer price requirements, so that the ultimate victim is the consumer himself.

   There is no tolerance for sloppy installation in engineering installations. Consumers need to understand that price is not a measure of the value of a purchase. You get what you pay for. In many cases, it seems that the two companies’ plans are similar, but the quotations are very different. The content is tricky, and the article is difficult to make clear. In short, a low price cannot be exchanged for high-quality engineering installation. Consumers should choose a trustworthy engineering company with more installation strength and installation reputation, so that they can use it without any worries in the later stage.

   What is the difference between central air conditioning refrigerant R22 and R410A?

R410A refrigerant and R22 refrigerant

Figure 2: R410A refrigerant and R22 refrigerant



  HFC working fluid R22, as a refrigerant for building air conditioning, has long occupied a dominant position. However, due to the important impact of ozone layer destruction and global warming, the Montreal Protocol has made clear provisions on the prohibition period of R22, that is, based on the production volume in 1985, it was compressed to 65% in 2003 and 35% in 2010. , 10% in 2015, and a total ban in 2020. Developing countries can appropriately postpone the total ban on the production of R22 products until 2040. With the further improvement of global environmental awareness, many developed countries have accelerated the pace of R22 replacement. The United States, Japan, and Canada have stipulated that R22 should be banned in 2010, and the European Community has stipulated that it should be before 2015. At present, the internationally optimistic substitutes for R22 are R407C and R410A. Among them, R410A is a near azeotropic mixture with little temperature slip, which is an ideal substitute for R22. In the United States and Japan, R410A has become the main substitute for R22 in room air-conditioning and combined air-conditioning systems.

   performance:

   In the special study on refrigerant near-critical point cycle performance published by the U.S. Department of Energy's Air Conditioning and Refrigeration Technology Research Institute in October 2002, for air conditioning systems, the air conditioning performance of two refrigerants R410 and R22 were compared. When the outdoor temperature is 27.8℃, the energy efficiency ratio (EER) of the R410 air conditioning system is slightly higher than that of the R22 air conditioning system, and at the highest ambient temperature of 54.4℃, the energy efficiency ratio (EER) of the R410 air conditioning system is lower than that of the R22 air conditioning system 15%.

   Installation and maintenance:

Compared with the air conditioner using R22, although the two devices and system piping in the new refrigerant R410A air conditioner are no different from the air conditioner using R22 in appearance, its manufacturing process requirements are higher, and the water content and impurity content in the system are all It is lower than the air conditioner using R22 and has higher pressure resistance.

  Refrigeration system:

Refrigerant copper pipes

Figure 3: Refrigerant copper pipes.



  (1) The high pressure of R410a refrigeration system is: 3.0MP, the low pressure is: 1.2MP. (In the same situation, 1.5 times of R22)

(2) When the R410A new refrigerant split is installed, the connecting pipe used must be a special R410A pipe. When emptying, it must be evacuated with R410A refrigerant. It should not be confused with the connecting pipe and refrigerant used in the R22 air conditioner, otherwise it will affect the air conditioner The stability of use.

(3) Since the compressor used in the R410A refrigerant split machine is lubricated with POE oil, the POE oil and water can react to produce water and acid, and the generated water can promote the further reaction of the POE oil. If the chain reaction continues for a long time, the system There will be more and more water inside, which may cause the capillary tube to be blocked by ice; at the same time, the acidity of the circulating working fluid in the system will become higher and higher (the PH value is lower and lower), which may cause corrosion of the parts in the system , And produce copper plating. Therefore, when installing the machine, the action must be rapid. After opening the plug of the connecting pipe, the nut must be tightened within five minutes and the emptying time must be sufficient. When installing the machine, it is forbidden to drip sweat into the connecting pipe; it is strictly forbidden to mix other insoluble impurities into the system. Also, when installing the R410A refrigerant split unit, it is best to do it on sunny days, not on rainy days, or when the humidity is high.

  (4) Chloride ions can also react with R410A refrigerant and POE oil to form acid to corrode the components of the refrigeration system. Therefore, do not mix chloride ions inside the system during installation. Such as dripping sweat, and other impurities containing chloride ions.

  (5) When repairing, as long as the refrigeration system is cut off, no matter what the reason, the filter drier must be replaced. After cutting the refrigeration system, you must immediately wrap the opening with something to prevent moisture in the air from entering the system. The refrigeration system shall not be exposed to the air for more than five minutes.

  (6) When replacing the filter drier, after opening the sealing plugs at both ends of the filter drier, it must be welded into the system within five minutes to isolate the air as soon as possible, otherwise it will affect the performance of the filter drier.

(7) When vacuuming after maintenance is completed, the vacuum pump used should be a special vacuum pump. The lubricating oil of this pump should be grease oil, and this pump should not be used to vacuum the air conditioner using R22, otherwise it will cause refrigerant damage. Mixed pollution, thereby affecting the performance of the air conditioner. The vacuuming time must be guaranteed to be more than 25 minutes. Otherwise, the moisture in the system will be high, which will affect the stability of the air conditioner.

  (8) When repairing, if you need to replace parts, you must use R410A special parts, not mixed with R22, otherwise it will affect the stability of the air conditioner.

(9) R410A refrigerant should be stored in an environment below 30°C. If it has been stored in an environment above 30°C, it must be stored in an environment below 30°C for more than 24 hours before it can be used, otherwise the components of the refrigerant will be affected. Changes that affect the performance of air conditioners

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