1.R410A system copper pipe to oil treatment copper pipe to choose oil-free copper pipe (copper pipe factory can be customized). The use of ordinary copper pipe (oil) for construction, it is necessary to use gauze dipped in perchloroethylene solution to clean the copper pipe. Purpose of copper pipe cleaning: to remove the lubricating oil attached to the inner wall of the copper pipe (in the process of copper pipe processing oil). This lubricant has a different composition than the R410A refrigerant lubricant, and the two can react to form deposits that can lead to complex system failures.

Special reminder: It is strictly prohibited to use carbon tetrachloride for cleaning and blowing operation of pipeline, otherwise it will cause serious damage to the system!

Soldering operation points and precautions multi-connector welding needs to be nitrogen-filled protection, the purpose of preventing the inner wall of the copper tube at high temperatures to produce oxidized skin. Note that brazing must continue to nitrogen into the refrigerant tube, and ensure that the nitrogen flow through the operation of the welding point, until the end of the welding, the copper tube is completely cooled.

2, brazing nitrogen into the refrigerant tube to maintain a pressure of 0.2kgf / cm2 (brazing after the copper tube has not yet cooled, should continue to blow nitrogen until cooled.) If: poor nitrogen flushing will produce oxidized film, resulting in system blockage and damage to the compressor. When brazing, preheat the copper tubes and fittings evenly. When preheating, the flame and the surface of the copper tube should be at right angles as much as possible, and Z-shaped preheating should be carried out for the tube and the joint interacting along the surrounding direction.

Brazing: welding must be preheating the welded parts, the flame will bake hot copper pipe welding, when the copper tube is heated to purple red, remove the flame and then lean the solder in the weld opening, so that the solder melts and flows into the welded copper parts, the temperature of the heated temperature can be reflected by the color of the temperature. In the welding of copper pipe fittings should pay attention to the flame, the nature of the flame is based on the type of metal being welded and its nature to decide, we should be reasonable choice to use. We refrigeration copper (copper) pipe fittings welding is generally used is a neutral flame.

Note: After brazing work, do not use cold water to cool the welded part rapidly.



3. pipe blowing pipe blowing with pressure gas flushing pipe (raw material pipe or welded components) to remove dust (solid impurities can not be blown out, so pay attention to the protection of the construction process) and water.

The main purpose of blowing:

When nitrogen replacement is insufficient to remove oxide powder or part of the oxide skin in the copper tube.

When the tube is not sealed tightly, it can remove the dirt and moisture inside the tube.

The specific operation of blowing dirt:

Hold a suitable blocking material (such as a block of wood wrapped in white cotton cloth) against the mouth of the copper pipe.

When the pressure increases to the inability to resist, suddenly release the mouth of the pipe (a blowing wash).

Repeat steps 1 and 2 above for repeated blowdowns (for multiple blowdowns)

Flushing dirt can be checked by loosely placing a piece of white cotton cloth in the pipe opening, occasionally some moisture can be found to dry the pipe thoroughly.

The order of blowing dirt: when the pipeline has been connected to the system, the order of blowing dirt is from far to near. That is, relative to the host, starting from the farthest end of the mouth, in order to the host direction.

Attention:

When blowing on one of the orifices, all the orifices connected to the pipeline must be blocked before blowing.

After the blowing, all the orifices connected with the atmosphere must be sealed to avoid the re-entry of dust, debris and moisture.