Why Should The Refrigeration System Be Vacuumed?

- Apr 26, 2020-


Refrigeration system are that using HFC gas ,HCFC gas ,HC gas and HFO gas as cooling gas, mainly includes Freon R134a, Refrigerant gas R410a for air conditioner, HFC gas R22,R404a,R407c,R507,etc.

Refrigeration system are that using HFC gas ,HCFC gas ,HC gas and HFO gas as cooling gas, mainly includes Freon R134a, Refrigerant gas R410a for air conditioner, HFC gas R22,R404a,R407c,R507,etc. Why does the refrigeration system emphasize vacuuming? Let ’s first look at the composition of air: Nitrogen accounts for 78%; oxygen accounts for 21%; other gases account for 1%. So let's analyze now what effect does the composition of the gas have on the refrigeration system after it enters the refrigeration system?


*1. The effect of nitrogen on the refrigeration system

First of all, we must know that nitrogen is a non-condensable gas. Non-condensable gas circulates in the system, no Condensation with the refrigerant will not produce a cooling effect. The presence of non-condensable gases on the refrigeration system There is a great hazard, mainly manifested in the increase of the system condensing pressure, the increase of the condensing temperature, the pressure

The temperature of the compressor exhaust rises and the power consumption increases.

Nitrogen enters the evaporator and cannot evaporate with the refrigerant; it also takes up the replacement of the evaporator The hot area prevents the refrigerant from fully evaporating and the cooling efficiency is reduced; meanwhile, due to the exhaust temperature Too high may cause carbonization of lubricating oil and affect the lubricating effect. In severe cases, the motor of the refrigeration compressor may be burned.


*2, the impact of oxygen on the refrigeration system. Oxygen and nitrogen are also non-condensable gases. Compared with nitrogen, if oxygen enters Into the refrigeration system, there are these hazards:


1). The oxygen in the air will chemically react with the refrigeration oil in the refrigeration system to produce organic matter, and finally  Impurities are formed and enter the refrigeration system, causing dirty plugging and other adverse consequences.

2). Oxygen reacts easily with refrigerant, water vapor, etc. to form acid, which oxidizes the refrigeration oil,

These acids will damage the components of the refrigeration system and damage the insulation of the motor; at the same time these acid products

Will stay in the refrigeration system all the time, at first there will be no problems, as time goes on, finally

Causes damage to the compressor.


*3. The influence of other gases (water vapor) on the refrigeration system

1). There is water in the refrigeration system, the first effect is the throttle structure, when water vapor enters the throttle

When the mechanism is in operation, the temperature drops rapidly and the water reaches the freezing point, causing ice formation and blocking the small throttle structure The through hole causes ice block failure.

2). The water vapor of the corroded pipeline enters the refrigeration system, the water content of the system increases, causing the pipeline and equipment toCorrosion and blockage.

3). Produce sludge deposits. During the process of compressor compression, water vapor encounters high temperature and freezing oil,Refrigerants, organic substances, etc., produce a series of chemical reactions, resulting in damage to the motor windings, metal Corrodes and forms sludge deposits .


In summary, in order to ensure the effectiveness of the refrigeration equipment and extend the life of the refrigeration equipment, the refrigeration There is no non-condensable gas on the surface, and the refrigeration system must be evacuated.