the Defect is moisture in the system
the Removal of moisture in the refrigerant circuit modern refrigerators
Defect „the moisture in the system’ physically represents the presence of a quantity of water in any of the aggregate States (liquid, steam, crystals) in the cavity cooling unit.
the Removal of moisture when you hit her in the domestic refrigerator is a difficult, time-consuming and economically costly problem. This problem besides again can come through the months and years after eliminating its external signs. A minor amount of water, to seriously disrupt the functioning of the refrigeration unit.
If to the filling pipe of the refrigerator connect the manometer, and the air america compressor to turn on through the devices controlling the current consumption or power, the external manifestation of the presence of water in the system is as follows: suddenly in the process of filling starts to noticeably drop the suction pressure, power consumption or current are reduced to quantities of work in a vacuum. The noise of the air compressor belt is also characterized as to work on the vacuum. The noise of traffic and the boiling point of the refrigerant is stopped, despite the operation of the air compressor for sale „Smooth” or „sharp» increase the manifestation of the defect depends on the amount of moisture in the system, and there are more than, the earlier and more sharply expressed manifestations. If at this time to stop the unit, pressure equalization occurs. That is, initially the signs correspond to the defect „blockage in the capillary tube» (hereinafter CT). The way it is. But unlike blockage caused by contamination of a variety of mechanical inclusions, which itself persists, we consider the defect is reversible. The thing is that when driving on CT drip moisture at the inlet to the evaporator, where it begins throttling of the refrigerant and has the lowest in the unit temperature, crystallizes turns to ice and premarket to the cooled walls inside CT. If its a lot, it's freezing blocks the passage of the original tube and completely disrupts the circulation of the refrigerant. But as soon as the temperature of the walls of the CT becomes positive, an ice plug melts and the pressure of the refrigerant in the condenser (capacitor) is capable of „spit" this tube into the cavity of the evaporator. Therefore, to distinguish the moisture from mechanical blockage easily — enough to heat any suitable method (e.g., with a lighter, torch or Hairdryer) CT input to the evaporator, and after a short time you can hear a sharp characteristic sound breakthrough gases from the condenser. This is followed by the movement of the refrigerant with low temperature and high pressure in the suction line. Often when there is abundant moisture „sticking" (i.e., freezing of moisture) is repeated again and again, over short periods of time.
Variants moisture in the system. Conditionally they can be divided into three main types:
1. Production. They are associated with deviations in the development of technology and manufacturing at the manufacturing plants. Very rare phenomenon, but it was observed, for example, in the first wave of refrigerators NORD (NORD). There's even the alcohol in the system at the plant was added, and it was clear blue flame from just air compressor filters. Since the „Soft Line» technology of production of these household refrigeration appliances (hereinafter BHP) has improved.
Moreover, this type can be attributed to the manifestation of moisture when selected from parts of the unit during operation of the refrigeration machine — from the press-gang winding motors XKB or HH.
2. Operational. They are caused by moisture in the form of steam from the external environment together with air in case of depressurization of the unit outside the territory of the factory (the breakup of the tubes during transportation, punctures evaporator, corrosion of machine elements and so on). Characteristically, in this case, the moisture gets into the cavity of the unit not only during operation, but even in a disabled state. If the unit leaks „is a long time, the penetration of moisture into the system is improved due to the „respiratory unit" (a term the author). For explanation, consider the following case. For example, depressurization (let it be a slight CT) occurred hot summer morning. The unit does not work. During the day the temperature rises, and due to the thermal expansion of the residual gases are removed from the unit. In the evening, the temperature is reduced, the available gases are compressed and when the pressure inside the unit is reduced below atmospheric, there is a suction of external air containing moisture. And so day after day. Then by convection and Brownian motion is the mixing and distribution of the mixture of gases and vapors through the system with all the unpleasant consequences. And the longer is without repair (or at least to eliminate leakage) such a device, the more severe the consequences of such inaction.
But it is much worse if, for example, had a puncture the evaporator during operation or defrosting BHP. If the 60 gallon air compressor works after reset excess pressure in the system to force begins to act of existing (and often rich) moisture, including in the liquid state. It is distributed throughout the cavity unit, and the consequences can be catastrophic (for PHP) character.
3. The repair process. They are mostly associated with ignorance and gross violations of technological processes when carrying out the repair work. It saves on replacement exhaust filter-drier, the absence or insufficient vacuumlike, the use of substandard supplies, poor preparation (no purging obviously moist sites, ac compressor oil change, if necessary, and so on).
for Example, the author in the beginning of his practice baffled massive failure of refrigerators due to the presence of moisture in the system in the time from July to September. Immediately after Assembly, he served in the system of liquid refrigerant (there was no vakuumirovaniya stands). It was hot, the air was damp, and the author's ignorance of the sudden cooling „two systems" moisture in the unit. When he figured out the cause, then began to apply the halon small portions in the form of steam, and further problems were observed. And only the application of vacuum allowed to go to the supply of refrigerant in liquid form.
Another example — used filter-dryers in those days came not sufficiently dry. And when soldering after a warm-up filter spin-off moisture was inside the unit. After prepaymania to the condenser had to blow out the filter by briefly turning on the compressor — after that, the situation changed radically. And about the drying oven under vacuum filters (and many other equipment) then you could only dream of.