Tips that businesses don’t want you to know Identifying fake and shoddy refrigeration equipment installation materials

Tips that businesses don’t want you to know Identifying fake and shoddy refrigeration equipment installation materials

The main installation materials commonly used in refrigeration and air conditioning installations are: refrigerant copper pipes, thermal insulation cotton, condensate pipes, splitters, signal lines, and refrigerants. So how to distinguish the quality of these refrigeration materials?

1. Refrigerant tube

　　 High-quality refrigerant copper pipes have high cleanliness and strong pressure resistance, and will not be broken due to uneven pressure during operation. Inferior refrigerant copper pipes are easily squeezed and deformed by external forces, which may cause the refrigerant pipe to rupture during operation and affect the cooling/heating effect of the air conditioner. How to identify copper pipe?

Look at the color: The best refrigerant copper tube at present is red copper tube with a purity of more than 99%, which is called pure copper, and the color is rose red; other copper tubes are mostly alloy copper tubes, such as brass tubes, which are 7: 3 Copper to zinc ratio is synthesized, and the color is yellow.

　　 Touch by hand: The inner and outer walls of high-quality refrigerant copper pipes are smooth, clean, and free of defects such as blisters, oxidation, and cracks.

　　Bending copper pipe: The high-quality copper pipe has no creases and deformation after bending; the inferior copper pipe is easy to produce creases after bending, and is easy to be squeezed and deformed.

Copper tube process: At present, the production of copper tube mainly includes extruded copper tube and stretched copper tube. The extruded wall thickness is thicker and the wall thickness is more uniform. The stretched wall thickness is easy to be uneven. The new refrigerant R410A runs When the pressure is high, the weakened wall of the stretched copper tube will easily burst.

　　 2. Condensate pipe

　　High-quality condensate pipe, high strength, not easy to bend and deform, smooth inner wall, not easy to build up dirt, and low drainage resistance. Inferior condensate pipes have thin inner walls and are easy to deform; they are easy to burst and crack when washed by water.

Look at the surface: look at the surface finish and whiteness of the water pipe. A good condensate pipe has the same color inside and outside, which is off-white with oily gloss on the surface. If the color is too white, there may be too much calcium powder, and the yellowish PVC material may be poor and easy to oxidize. Poor.

　　Measuring wall thickness: The wall thickness of a good condensate pipe should be uniform and smooth, and the wall thickness is better.

　　 Sampling test: The color of the tube is unusually bright but easy to break is usually a high-calcium product with calcium powder. Take the sample and step on the edge of the tube to see if it cracks easily.

　　 Three, insulation cotton

　　High-quality thermal insulation, high density, low thermal conductivity, better thermal insulation effect. It has excellent resistance to water penetration, and the heat preservation is longer. Inferior thermal insulation, poor resistance to water vapor, easy to enter water and damp, and poor thermal insulation effect.

　　 The national standard GB8624-97 divides the combustion performance of materials into: Class A non-combustibility, Class B1 non-combustibility, Class B2 flammability, and Class B3 flammability. Class A is the highest standard. Class B1 ignites in case of fire and self-extinguishes away from the fire. Class B2 ignites in case of fire and continues to burn away from fire.

　　Look at the appearance: the foaming pores of the thermal insulation cotton, the smaller and denser, the better the shock resistance, heat insulation and heat preservation effect.

　　 Measuring wall thickness: same grade, the same diameter of pre-installed copper pipe/water pipe, the thicker the insulation wall thickness, the better the insulation effect. And the thickness of insulation cotton of each pipe diameter has corresponding national standards.

　　 Squeeze test: Use your hands to hold and hold for heat preservation. The ones that are easily deformed after being squeezed are generally low-quality heat preservation, and those that do not deform after squeezing are generally high-quality heat preservation.

　　Four, splitter

　　 High-quality splitter, made of high-quality copper, bright in appearance, not easy to oxidize, and uniform welding rules. Inferior splitter, easy to desoldering, false welding, oxidation, easy to cause fluorine leakage explosion and other hazards.

　　Look at the appearance: the high-quality splitter has bright color, uniform and firm welding, and the inside and outside of the pipe wall is clean, free of impurities and dirt; poor splitter welding is easy to desolder, contains impurities, and is easy to oxidize.

　　Measuring wall thickness: The thickness of the copper pipe used in the branch pipe should be determined according to the size of the diameter. The larger the diameter, the thicker the copper pipe should be used. Under normal circumstances, 1mm thick copper pipes are sufficient for diameters below 22.3, 1.3mm copper pipes for 31.8 and below, 1.5mm copper pipes for 35 and above are best, and copper pipes of suitable thickness can be used to ensure the maximum quality. . The splitter and copper tube should be made of red copper, especially R410A special copper tube splitter.

　　 Five, signal line

　　 High-quality signal wires, using top-quality insulating materials, more cores, faster and more stable signal transmission, and lined with copper wires for shielding interference, which are safer.

　　Inferior signal lines, using general insulating materials, have poor resistance to corrosion and aging. The number of cores is small, and the copper wire has no shielding interference, and the signal transmission is slow and unstable.

Look at the copper core: the copper core of the high-quality signal line should be purple-red and shiny, and the number of copper cores is large and dense; the copper core of the second-class copper core wire is purple-black, yellowish or white, with many impurities, and the number of copper cores is small. Sparse.

　　Hand test: The high-quality copper core wire feels soft and has good toughness. The inferior copper core wire has poor mechanical strength and poor toughness, and it will break with a little force.

　　Look at the appearance: The outer casing of the high-quality signal line should be made of insulating material, the casing should be thick, and the inner lining should be anti-breaking fiber and shielding interference layer.

　　 Six, refrigerant

　　Analysis: R22, CHCLF2, is a pure substance with a purity of at least 99%; the counterfeit R22 in the market currently contains methyl chloride and other corrosive substances with a high proportion. Monochloromethane is highly corrosive and will cause severe corrosion to the compressor of the refrigeration unit, resulting in the compressor being scrapped.

　　 There are many counterfeiting methods that are hard to guard against. Everyone must not be greedy for small bargains and must buy well-known big brands. The low-quality refrigeration materials flood the market, which not only causes serious harm to the market order, but also seriously damages the refrigeration equipment, which has a great impact on the refrigeration effect and after-sales service!