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First, the compressor air return port frosts
The frosting of the compressor air return port indicates that the compressor air return gas temperature is too low, it is known that the refrigerant of the same quality will have different performance if it changes the volume and pressure, that is, if the liquid refrigerant absorbs more heat, then the refrigerant of the same quality will have high pressure, temperature and volume, and if the heat absorption is less, the pressure, temperature and volume will be low.
That is to say, if the compressor return temperature is low, it generally shows that the return air pressure is low and the refrigerant volume of the same volume is high. The root of this situation is that the refrigerant flowing through the evaporator can not fully absorb the heat required for its expansion to the predetermined pressure temperature value, resulting in the temperature pressure volume value of the return air is relatively low.
There are two causes of this problem:
1, the throttle liquid refrigerant supply is normal, but the evaporator can not normally absorb heat to supply refrigerant expansion.
2, the evaporator heat absorption work normally, but the throttle valve refrigerant supply is too much, that is, the refrigerant flow is too much, we usually understand as more fluorine, that is, more fluorine will also cause low pressure.
Second, due to the lack of fluorine caused by the compressor return air frosting
1, because the flow of the refrigerant is particularly small, it will cause the refrigerant to expand from the back end of the throttle valve after the first expandable space began to expand, most of us see the expansion valve at the back end of the liquid head frost is often due to lack of fluorine or the expansion valve flow is not enough caused by too little refrigerant expansion will not use the whole evaporator area, only in the evaporator local formation of low temperature, Due to the small amount of refrigerant in some areas, the rapid expansion of the local temperature is too low, and the evaporator frost phenomenon appears.
After local frosting, due to the formation of a thermal insulation layer on the surface of the evaporator and the low heat transfer in the area, the refrigerant expansion is transferred to other areas, and gradually the whole evaporator frosts or freezes, the whole evaporator forms a thermal insulation layer, so the expansion spreads to the compressor return gas pipe resulting in the compressor return gas frosting.
2. Due to the small amount of refrigerant, the evaporator evaporation pressure is low resulting in low evaporation temperature, which will gradually lead to evaporator condensation forming a heat insulation layer and transfer the expansion point to the compressor return air leading to compressor return air frosting. The above two points will show the evaporator frosting before the compressor return air frosting.
In fact, in most cases for the frost phenomenon, as long as the adjustment of the hot gas bypass valve on the line, the specific method is to open the rear end cover of the hot gas bypass valve, and then use the No. 8 hex wrench, clockwise turn the adjustment nut inside, the adjustment process is not too fast, generally turn about half a circle to pause, let the system run for a period of time to see the frost situation before deciding whether to continue to adjust. When the operation is stable and the frosting phenomenon of the compressor disappears, tighten the end cover.
For models less than 15 cubic meters, because there is no hot gas bypass valve, if the frost phenomenon is serious, you can properly adjust the jump pressure of the condensing fan pressure switch. The specific method is to first find the pressure switch, remove the adjustment nut fixing small piece of the pressure switch, and then rotate clockwise with a Phillips screwdriver, the whole adjustment also needs to be slowly carried out, adjust half a circle to see the situation and then decide whether to adjust.
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