Summer is the peak period of variable frequency air conditioning installation, and a procedure before the installation of variable frequency air conditioning, vacuum, but it is often ignored by everyone. So, must the vacuum during installation? What is the necessary effect of vacuum extraction on itself? What does the vacuum pump do?
一、vacuum extraction:
1. Remove the non-condensable gases in the system: the existence of non-condensable gases will increase the condensing pressure and exhaust temperature of the system, which will affect the refrigeration effect; It may also cause carbonization of lubricating oil at high temperature, harm the normal operation of compressor and even burn the compressor motor.
2. Remove the system of water: water is the biggest killer in refrigeration system (especially a vapor compression refrigeration cycle of freon system), first of all, lubricating oil and water will generate acid, will be corrosion system, at the same time will cause the phenomenon of copper plating, damage the compressor; At the same time, water will cause expansion valve port or capillary ice, resulting in “ice block.”
二、Principle of vacuum extraction:
1. After the start of the vacuum pump, the non-condensable gas and water vapor in the system are first extracted, and then only the water molecules (liquid) remain.
2. With the increase of vacuum degree, absolute pressure in the system is reduced, when the absolute pressure inside the system down to corresponding to the ambient temperature of saturated steam pressure, boiling system within the remaining water molecules into water vapor, continue to be pulled out, it is important to note that in the process of pumping air into vacuum state, under the condition of normal operation, in the system and the external environment temperature is the same. This is also why the lower the ambient temperature, the harder the vacuum, the slower the speed.
三、 Frequency conversion air conditioning installation:
Is vacuum pumping really necessary? Caution: make sure to vacuum for 15-20 minutes. Air conditioning three parts quality, seven parts installation. Vacuum extraction is an indispensable process in the installation of non-fluorinated, and it is also the most important step to ensure high performance of air conditioning.
However, the professional quality of the installation team is different now, so it is not guaranteed that everyone will voluntarily operate this process. The normal vacuuming time should be 15-20 minutes, so that the air in the system can be completely drained away. Otherwise, it will easily affect the overall performance of the air conditioner, resulting in poor cooling and heating effect and high energy consumption. Summer is the peak period of air conditioning installation. Some workers may not smoke or simply smoke for a few minutes in order to install more units and save time.
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