Comprehensive introduction of central air-conditioning installation auxiliary materials (recommended collection)

Comprehensive introduction of central air-conditioning installation auxiliary materials (recommended collection)

Generally speaking, the auxiliary materials required for the installation of household central air-conditioning mainly include the following types: refrigerant pipes, refrigerant pipe insulation cotton, branch pipes, power lines, communication lines, power lines, communication lines, PVC condensate drainage pipes, Booms, clamp components, outdoor unit damping pads, air outlets, etc.

　　1. Refrigerant pipe: the pipeline for circulating the refrigerant in the air-conditioning system and the bridge for the transfer of cold and heat.

　　1.1. The wall thickness and pressure resistance of the selected refrigerant tube should meet the technical requirements.

　　1.2. The refrigerant pipe should be free of defects such as blisters, oxidation, and cracks.

1.3. Installation requirements: The refrigerant pipeline should be arranged with hangers with appropriate spacing according to the pipe diameter, and covered with insulating cotton that meets the requirements.

2. Refrigerant pipe insulation cotton: set on the outer surface of the refrigerant pipe to prevent the loss of heat and cold of the refrigerant pipe and the condensation water during cooling operation.

　　2.1. Good quality B1 plates and pipes are printed with white fonts. The manufacturers generally use English logos, and the fonts are not easy to erase.

　　2.2. The font does not change shape after stretching with good quality.

　　2.3, B1 grade rubber and plastic products of good quality are rich in non-combustible, flame-retardant, and smoke-reducing raw materials. The smoke generated during combustion is extremely small, and it does not melt, and there will be no fireball dripping, and it has the characteristics of natural extinguishing.

　　2.4, the thickness requirements of the insulation layer:

　　A. When the outer diameter of the copper tube d≤Φ12.7mm, the thickness of the insulation layer δ=15mm or more.

　　B. When the outer diameter of the copper pipe d≥Φ15.9mm, the thickness of the insulation layer δ=20mm or more.

　　C. When the outer diameter of the copper pipe is d≥Φ41.3mm, the thickness of the insulation layer is δ=25mm or more.

　　3. Branch pipe: The refrigerant is used when the refrigerant is diverted in the pipeline. Whether the installation is level or not will seriously affect the operation effect and reliability of the system.

　　3.1. It is recommended to use ECO branch pipe with thick wall thickness, good welding quality, and no pipe burst due to excessive pressure.

3.2. Installation requirements: it must be installed horizontally, and there must be a straight line distance of 0.5m between the front and back of the branch pipe; only when installed strictly according to this requirement, the refrigerant between the indoor and outdoor units can be allocated reasonably, and the use effect of each indoor unit The reliability of the outdoor unit can be guaranteed.

　　4. Power cord: internal and external machine power connection lines. The wire diameter is strictly selected according to the product requirements. The internal machine power supply of the same system must be supplied uniformly to ensure the normal operation of the system.

　　4.1. Qualified copper core wire The copper core should be purple-red, shiny and soft to the touch. Fake copper core wire The copper core is purple-black, yellowish or white, with many impurities, poor mechanical strength, and poor toughness, and it will break with a little force.

　　4.2. Wiring requirements: When the wire diameter is selected correctly, the power supply wiring must use wire lugs to ensure that the wiring is firm and must be grounded reliably.

　　 5. Communication line: used for communication between internal and external machines, shielded line is used, and the connection method is series connection. If you select a communication line that does not meet the requirements, it will affect the stability of the system communication and affect the operation effect.

　　5.1. The copper core of the qualified copper core wire should be purple-red, shiny and soft.

　　5.2. Fake and inferior copper core wire The copper core is purple-black, yellowish or white, with many impurities, poor mechanical strength, and poor toughness, and it will break with a little force.

　　5.3. Wiring requirements: three-core shielded wire must be used, the shielding layer must be grounded, the wiring must be firm, and the shielding layer must be wrapped with power tape to prevent the copper wire from being connected to other terminals and causing abnormal communication.

　　6. ​​Power line and communication line conduit: When laying the power line or communication line, in order to ensure that the line will not be damaged during the installation process, and the communication signal will not be interfered by strong electricity, it can be reliable and durable for a long time, the line must be put on the conduit separately.

6.1. Wire pipe threading requirements: the power wire and signal wire cannot be threaded in the same wire pipe, and must be separately threaded with an interval of more than 300mm; when the wiring comes out of the junction box and is connected to the power terminal of the air conditioning equipment, plastic corrugated should be used Protect the pipe, and wrap black tape on the connection between the plastic corrugated pipe and the junction box.

Power cord, communication line conduit

7. PVC condensate drain pipe: connect the drain outlet of each indoor unit to drain the condensate generated during the cooling operation of the indoor unit in time; the condensate drain pipe must be sheathed with insulation cotton with a thickness of not less than 10mm to prevent condensation on the pipe surface water.

　　7.1. Good: The handwriting is clear and comprehensive. Rub it with your hands and it should not be erased.

　　7.2. Good: Use a fire to burn it, not that it will not burn, but if the fire source is extinguished, it will also go out.

　　7.3. Good: The pipe diameter is regular, the thickness is uniform, and the color should not be yellowish.

　　7.4. Installation requirements: The spacing between the hangers of the condensate pipes must be reasonable, and there must be a 1/100 slope toward the pipe drain.

　　 8. Composite air duct material: used for the production of the air duct for the return air of the internal machine. It has the characteristics of low wind resistance and good heat preservation effect, which effectively guarantees the operation effect of the air conditioner.

　　8.1. Check the material density according to the material density table provided by the manufacturer to confirm the quality.

　　8.2. Look at the surface finish and confirm the quality.

　　8.3. Knock on the composite material to confirm the quality, and the sound is more pleasing to the ear, just like choosing a ceramic tile.

8.4. Installation requirements: When connecting the air duct to the internal machine, a soft canvas connection should be made to reduce vibration and noise; the air duct hanger should be arranged reasonably to ensure that the air duct is hoisted firmly; the size of the air duct and air outlet should be reasonable to ensure the air outlet effect .

　　9. Hanger rod and clamp assembly: used to fix the refrigerant pipeline and drain pipeline. The boom and clamp are used in combination. The distance between the booms is determined according to the pipe material and pipe diameter to ensure that the pipeline is stable and does not sink.

　　9.1. Installation requirements: At the turning point and branch pipe of the pipeline, the hanger must be installed for reinforcement; according to the pipe diameter, the appropriate spacing should be selected for the hanger reinforcement. At the same time, the position of the clamp should be protected by a PVC pipe to prevent damage to the insulation cotton and cause dripping.

　　10. Outdoor unit vibration damping pad: It is placed on the bottom of the outdoor unit's feet to effectively reduce the vibration and noise of the outdoor unit. Improve the comfort of the air conditioner.

　　 10.1. The thickness of the cushion is not less than 50px, and it should be uniform and not easy to deform and crack.

　　 10.2 The compressive strength of the shock-absorbing pad should be able to withstand the weight of the outdoor unit, and it is not easy to deform and crack after the outdoor unit is matted.

　　 10.3. Installation requirements: The damping pad should be fixed with the feet of the outdoor unit, and the installation foundation must be level. After installation, vigorously swing the outdoor unit to confirm whether it is firm and reliable.

Cushion

　　11. Copper pipe welding requirements: When the refrigerant pipe is welded, the pipe must be continuously filled with nitrogen, and the pressure shall be controlled at about 0.2～0.3kgf/cm2 to ensure that no oxide scale is generated in the refrigerant pipe.

　　 11.1. Welding requirements: When the refrigerant pipe is welded, it must be continuously filled with nitrogen gas, and the airflow size should be controlled appropriately.

　　 11.2. The place where the nitrogen gas filling hose is inserted into the copper pipe port must be wrapped so as not to leak.

　　 11.3. The path of nitrogen charging must be reasonable, there must be only one outlet, and the nitrogen must flow through the welding point of the pipe where it is welded.

　　12. Refrigerant pipeline connection method: When connecting two refrigerant pipes of equal pipe diameter, the expansion pipe must be used to ensure the welding quality.

　　 12.1. Purpose: Expanding pipe processing is to enlarge the pipe mouth and insert the copper pipe instead of straight-through, which can reduce solder joints. Ensure the welding quality of the refrigerant pipeline.

　　 12.2. Key points: The connecting part of the expanded tube must be kept smooth and flat; after cutting the tube, remove the burrs inside the nozzle.

　　 12.3. Operation method: insert the expansion head of the expander into the tube to expand the tube, turn the copper tube to a small angle after the expansion is completed, and trim the expansion head to leave a straight line mark.

　　13. Bell mouth: When the refrigerant pipe is connected to the pipe joint, the refrigerant pipe mouth must use a professional flaring tool to ensure the quality of the flaring and prevent the interface from leaking.

　　13.1. Use a flaring device to expand the bell mouth. The pipe mouth should be flat and free of burrs, and the bell mouth should be free of deformation and cracks.

　　 13.2. When connecting with the pipe joint, first connect the bell mouth to the pipe joint, tighten it by hand, and then use two adjustable wrenches to tighten it at the same time.

　　 14. Tuyere: Small parts are often neglected by many consumers, but this part has a great influence on the interior decoration effect.

　　14.1. There are two common air vents: one is ABS air vent, the other is aluminum alloy air vent. Both types of tuyere have their own pros and cons.

　　 ABS tuyere: Made of ABS engineering materials, it is not easy to condense. However, the material has a certain coefficient of thermal expansion and contraction, so it may squeak during use, and the air outlet may also be slightly arched when the temperature is low in winter. The tuyere will turn yellow after prolonged use and it is not easy to clean.

　　Aluminum alloy tuyere: The advantage is that it is not easy to deform and discolor. However, because the heat transfer rate of aluminum alloy is very fast, it is easy to condense during summer use. In severe cases, water droplets will be produced.