How to vacuum the refrigerator at home
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The vacuum is used to determine the level of the atmosphere (degassing and dehydration) in the system.
The rapid and deep vacuum of the refrigerator of the air conditioner or the contour of the cooling system simply boils down to the correct action, including the correct installation and assembly, the prevention of moisture when laying the refrigerator and, of course, the correct hoses and sensors for measuring the degassing and dehydration level. When moisture (fluid) enters the system or condenses, the only way to remove it is steam. When it comes to vacuuming the system, thus only a small amount of moisture can be removed. “Impractically remove a large amount of water using a vacuum pump, since boiling water produces a large amount of water vapor. 1.7 cubic meters are obtained from one liter of water.M of water vapor, at a temperature of 21.1 ° C. Therefore, during installation. “Keep the pipeline clean, dry and tightly closed”.
The tubes should be clean and dry throughout the installation, moisture, dirt and other pollution can disrupt the system and significantly increase the time required to vacuum. Nippels of gas stations (valves) should be removed using a special tool designed for a vacuum for installing and removing nipples to ensure the purge of the system with nitrogen and the possibility of overlapping the system with shut.Off cranes, when possible, during the installation of the pipeline (highway). The pipeline should also be used to minimize the number of fittings and reduce internal restrictions. Fitings require pipe cutting, cleaning, removing burrs, assembly, soldering, nitrogen purges and testing for tightness. It is best to completely exclude fittings. A good pipe bend will pay off in a short time. In the cut areas of the pipe, the burrs should be removed using a special tool (Rimer.) Internal burrs can cause pipe erosion, decrease in the speed of absorbed gas and poorly returning the oil to the compressor. Even a few incorrectly assembled fittings can reduce the power of the refrigeration unit. Nitrogen should be blown through the pipeline during installation and during soldering in order to avoid pollution and moisture in the pipeline, as well as to avoid the formation of copper oxides during soldering. Use a calibrated flowmeter to avoid excess nitrogen. During the installation, the system of the system will significantly reduce the vacuum time during installation. Install a filter-dryer to remove moisture traces. After vacuuming, a small amount of moisture can still remain under compressor oil or, in the case of POE, mix with oil itself. The filter-dryer equipped with a humidity indicator installed immediately before the dosing device effectively removes moisture traces and helps to quickly identify potential problems with humidity. The installation of the dehumin next to the evaporator will better protect the dosing device, provide a visual presence of 100% of the liquid and prevent premature corrosion.
Vacuuming the refrigeration circuit
Vacuuming the refrigerator is carried out to remove air and gas from the circuit after crimping and, most importantly, to lower the moisture content. As shown earlier, the presence of moisture in the circuit can lead to clogging with ice supply regulators, a four.Way valve, with a high probability to failure of the compressor.
To remove moisture from the contour, the pump is necessary that the water from the liquid state goes into a gaseous. For this, with normal atmospheric pressure, it is necessary to heat the water to a boiling state or significantly lower the pressure. Since it is not possible to raise the temperature in the circuit, vacuum pumps are used that lower the pressure.
In Fig. 2 shows how the partial pressure of the vapor in the air saturated with the temperature changes. It is seen from the graph that for boiling water at a temperature of 20 ° C, the pressure should be reduced to 23 mbar, and at a temperature of 0 ° C to 6 mbar. It follows that it is advisable to vacuum the contour at elevated temperatures. To do this, when vacuuming, heat the heat exchanger of the circuit with a stream of hot air.
The depth of vacuum, which is considered sufficient for air conditioners, is 1 MBAR. For vacuuming, pumps (single.Stage, two.Stage with gas ballast) with a capacity of 10-60 m3/h are used with a vacuum depth of about 0.4 mbara.
When vacuuming, it is recommended to close the suction valve of the pump and skimuum the internal area and vacuum pump oil up to 6.6 mbara (in this case, the pump will become hot enough), and then open the valve.
The connection diagram of equipment for vacuuming the system, evacuating and refueling the refrigerant is shown in rice. 4. Vacuuming time depends on the internal volume of the refrigerator, the amount of moisture in the circuit and the surrounding temperature. As soon as the vacuum reaches 1 mbar, the valve going to the vacuum pump can be closed, and the pump is turned off.
It is necessary to pay attention to the hoses of the vacuum pump. With thin and long hoses, the pressure drop will be very large; The performance of the pump is reduced, which increases the vacuum time. In some cases, it is not possible to get the necessary vacuum.
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In the circuits with a capillary tube, vacuuming is made from the suction line through the gas storage collector. In systems with TRV, vacuuming should be carried out both from the suction line and from the bump line.
P align = “Justify” after the end of vacuuming, it is necessary to block the valves through which vacuuming was carried out and observe the nature of the vacuum change in the circuit. Possible options for changing the degree of vacuum are shown in rice. 5.
If within 24 hours the vacuum changes to 0.5 mbara (fishing line for trimmer 5), we can assume that the circuit is completely dehydrated and sealed. Curve 4 corresponds to a sealed, but initially poorly dehydrated system. Curve 3. The contour is not tight enough and poorly dehydrated. Curve 2. The contour is dehydrated, but the degree of tightness is insufficient. Fishing line for trimmer 1. The contour is dehydrated, but has a significant leakage.
If vacuuming is carried out after opening the circuit (after repair), then it should be remembered that it is extremely difficult to select moisture covered with a film of oil, and the vacuum time increases significantly. In this case, you need to vacuum through the filter-dryer.
Therefore, when repairing and any opening of the contour, it is necessary to replace the filter-dryer. The degree of moisture content of the refrigerant can quickly be evaluated by testing by the device shown in the rice. 7. With increased humidity in the refrigeration circuit, it is necessary to install a replaced filter. In the process of adjusting the refrigeration installation, the filters must be changed several times until the necessary degree of refrigerant moisture is achieved.
The type of oil can be promptly determined using an optical refractometer.
How to prepare for the replacement of freon at home
First of all, it is necessary to find the place of leakage. In the case of mechanical damage to the circuit, the “hole” in the system can be noticeable to the naked eye, however, if the visual inspection of the contours has not brought the result, it makes sense to check all the joints of the tubes by which the refrigerant circulates.
Important! All further manipulations must be carried out with a refrigerator disconnected from the network.
To localize the leakage place, you will need to serve a non.Air pressure to the circuit. All sections of the compounds are lubricated with a solution of a small amount of soap and water: the place of leaks will give itself out with pouting bubbles. In addition to pipes, it is also necessary to check for the presence of leaks on which there are oil pollution.
Attention! If you could not localize the place of leakage in this way, it is necessary to use the current. Most lenders are only configured for a certain type of refrigerant, so the search for a suitable device may be a difficult task.
If you are not very well versed in the device of your refrigerator, it is better to carefully study the technical documentation for the device before refueling the freon: the type of “working” freon and the design features of the model are most often indicated there.
Purging of individual component parts with compressed dry nitrogen or freon.
This is not always convenient and applicable, very costly and bulky, in addition, a large number of again soldered compounds reduces the reliability of the repair. Not everyone, but still. And still. This is a good technique, but this method generally requires only inpatient repairs, since there is a need for numerous and far from environmentally friendly operations. And in systems with the contours of the doorway heating, the use of a steel galvanized tube makes it difficult to carry out numerous installation and dismantling operations with it. It does not tolerate warmings and bends. Perhaps there are other ways, but most likely these are options from the above, but in various combinations.
The essence of the author’s technology proposed by the author to remove moisture from the system is this. After changing the standard 15-gram filter and the necessary preparatory work, the compressor launches to make sure what kind of vacuum it gives with the existing zero pressure of the system after assembly. The receipt of atmospheric air into the system is excluded. Normally, the vacuum corresponds to.0.40.6 bar. This is the simplest, but rather accurate check of the quality of the motor-compressor. Then vacuuming for at least 15 minutes is carried out. Next, they turn on the BHP compressor, and give the refrigeration unit to work under a vacuum for several minutes.
It is known that during the compressor operation, the oil is sucked by a pump from the pallet, passes through the compressor parts for cooling and sprayed with a jet on the walls of the casing.
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Then the oil flows into a thin layer into the pallet and the process is repeated in a circle. At this time, there is an active release of residual gases and impurities (including moisture) from the thickness of the oil in the pallet due to heating, mixing and movement. When heated by the casing and compressor, the process of emitting moisture from the oil improves, including by reducing the viscosity of the lubricant. But the rising evaporations are not able to actively circulate in the unit, since the number of gases available in the system is extremely insignificant.
This is clearly visible if you open the upper part of the casing of the motor-compressor and include it in the network. Then you can clearly observe how a thin stream of oil beats from the compressor on the walls of the casing and drains down (see. Rice. One).
Rice. One. Simplified type of compressor lubrication system
This was done to improve the cooling of heated oil after passing the compressor lubricants. And if we take into account that the oil flows down the walls with a thin film (giving heat to the casing), it will become clear that there is still mixing inside the layer and an increase in the area of the contact of the oil film relative to the internal cavity of the casing.
It is also necessary to take into account that when the compressor operation, the existing drip moisture in the thickness of the oil is broken in the rubbing details during the compressor into smaller fractions, and is mixed with the receipt of the water-oil emulsion, which facilitates the evaporation of the “film moisture in vacuum.
Another plus. After the operation of the BHP compressor, some excess pressure appears in the condenser, which increases the difference between the low and high sides of the unit. This should contribute to a faster removal of gases from the system with a vacuum pump.
To improve the process of evaporation of drip moisture (for example, if there was a puncture of the evaporator), it is advisable to warm the internal BHP cabinet in any way (a hairdryer, a burner, installation in a closed dish with hot water) at least up to 30. 40 ° C. After warming up the cabinet is closed to preserve the elevated temperature in it. The increased temperature of the gases inside the evaporator helps to increase the “absorption” of their moisture. But it is better to control the temperature and not let it rise above 60 ° C at the top of the cabinet. At 70 ° C, the plastic becomes soft, and already at 80 ° C the plastic material of the cabinet can “flow” with irreversible consequences.
After that, the process of slight adding freon to the unit begins, but do not allow increasing pressure in the working system above.0.5 bar. This is due to the fact that the circulation in the volume of the unit is improved (while maintaining a vacuum in the system), but it is undesirable to allow the appearance of the liquid fractions of the colad there, otherwise this will lead to the possible loss of drip moisture during throttling, which will stretch the time for its removal. After all, moisture will have to be evaporated again. In addition, the condenser warms up slightly, and the evaporation of the moisture in it improves.
At this time, water vapors are actively absorbed by the silica gel. It can be assumed that under the available excess pressure in the filter, the process is even more intense than with a simple stop of the compressor.
The operating time in this mode usually takes at least 0.5 hours, it greatly depends on the amount of moisture in the system. For example, if the system “grabs” a few minutes after starting the motor-compressor, it is useful to make its run within 2-4 hours. Everyone can choose the mode on their own, experimentally. Actually, the definition of the moment of termination of such a run can be identified by ear. The sounds of the injection of oil with moisture and without it are different.
It is impossible to leave such a process unattended. Many manufacturers simply prohibit the inclusion of the compressor under the vacuum, explaining this by the fact that the appearance of crown discharges at the passing contacts is possible. Theoretically, a violation of the compressor valves is possible by deviations of pressure from the calculated, or “sucking” the oil into the system of the refrigeration unit. But practice has shown that there are no problems.
After the run, the system will be vacuum again for 15 minutes to remove gases and the remaining impurities remaining in a suspended state. Sometimes without even turning off the compressor BHP. Next, a “vacuum of vacuum” is performed by the technological dose of freon (usually to half of the developed vacuum with a working compressor), then they allow the unit to work for several minutes to mix the medium, filling and blowing the condenser cavity.
The use of prolonged throttling during this period can again besiege still unsteady moisture. Subsequent vacuuming is carried out for about 5 minutes. Only in order to remove the bulk of the mass (presumably “captured”) of the shade.
Further, the process of refueling by a shaland is as usual. In case of suspicions of the repeated manifestation of the defect “moisture”, the dose is not complete. Only with a decrease in the temperature of the evaporator to.10 ° C (or below), in the absence of a “moisture” defect or an increase in specific noise, increase the dose of refueling to complete. Time, of course, takes more than usual, but physical labor and financial cost usually does not much exceed the standard.
Stages of refueling the refrigerator freon
After any repair work, as well as in the case of accidental damage to the cooling system, cooling gas, most often freon can disappear from the cooling system of the refrigerator. Over, this gas is without color, and it is possible to detect its absence in the system only by paying attention to not cooling in the freezer, and the refrigerator.
In order for the refrigeration unit to be filled absolutely accurately, the amount of refrigerant in the spray can decreases to the required amount
Freon refueling may be needed in certain cases:
- Replacing the compressor of the refrigerator. It happens, so that the compressor of the refrigerator comes out their system, in this case it requires replacement. And when replacing the compressor, gas can completely or partially leave the cooling system.
- When carrying out preventive work, for example, when cleaning capillaries, it may also be required to refuel a refrigerant.
- Also refueling, and in general, checking the operability of the refrigerator, may be needed after sloppy transportation, random blows on the compressor and condenser.
Initially, with low assembly quality, both the refrigerator itself and the entire cooling system in general, the tightness of the soldering of the pipes may be violated, and the formation of microcracks on them, which will sooner or later lead to a gas leak.
For high.Quality repair, it is best to take the refrigerator to a good service center.
It has all the necessary equipment to identify the damage site, as well as experienced specialists and, of course, the presence of different grades of gas, for example, the R600 brand. If Freon has already disappeared from the system, in this case you should turn off the refrigerator, and call a master who can find a leak, cake this place and season the refrigerator system with a freon.
The reasons for the refrigerant leakage
Among the most common causes of the problem, the following are noted:
- Incorrect work of the compressor.
- Violation of the tightness of the elements of the system. Capillaries, connections, tubes.
- Mechanical damage. Consequences of impact, falling during transportation.
- Microsemen in capillaries. Arise due to the low quality of the source materials or violations in the production process.
- Incorrect installation of system joints.
If you suspect a leak, it is recommended to examine the back wall visually. Before refueling, Freon will need to eliminate damage to the contour to avoid new breakdowns.
If the leak occurs due to damage, then before refueling it is necessary to eliminate possible damage.
Important! If there is a violation of the circuit and the evaporation of freon, you need to turn off the device from the network. In the absence of a cooling element, the compressor works without a break, which leads to a breakdown for a couple of days.
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DIY refrigerator with your own hands
The main types of breakdowns relate to the contour of the freon. A refrigerant leaned, the refrigerator stopped freezing. Virpool differs little from others. Strive to find out the refrigerator device to repair. Fearing the terms compressor, filter-dryer, there is nothing to do inside.
The purpose of the Schroeder valve
When the master comes, the first thing will check the Freon circulation system for leaks. How to do it? The current detector is configured to look for a freon, the contents flowed out how to look? Understandably. Fill the circuit with air, creating pressure. Theoretically consider the air containing the impurities of the freon, the almost second component is excluded by the master completely (expensive), the system contains miserable residues. You will get the desired mixture.
How to keep inside? You will need the Schroeder valve. Connects to the compressor service pipe. According to available information, the Schroeder valve is a nipple. The only difference is limited to good tolerance of low temperatures. The difference exists is the second, we mention below. Bypassing the shreder valve, air is pumped inward inward. The turn of the lecturer came. The detected cracks are localized, sealed. We vacuum, refueling.
The air pressure of the freon circuit is:
Air discharge, purging by nitrogen of the freon circuit of the refrigerator
Modern freons do not harm the environment, it is customary to drop excess, emptying the contour, outside the window. Observing precautions. You will need a needle grip. A device covering the filter-dryer with a grip, after a clamping screw, a copper of copper is performed. The knot becomes unusable, seasoning the freon, it is customary to replace the new. We display the hose out, open the valve, wait, pulling excess pressure. The service life of the refrigerator exceeds the indicators of the freon circuit, the amounting to the owner should know the procedure for execution of the gas station.
Then the purge is made with nitrogen. Dry gas helps to remove the remaining moisture, cleansing the system. Since the shredra valve is worn, the entrance to the gas is open. Output-on a filter-dryer through a needle grip. Make sure that the pressure of the nitrogen cylinder is below the mark of 6 atmospheres. Having noticed exceeding, use a reducing gearbox:
- Blow the refrigerator for some time;
- Crush the valve of the needle capture;
- Cut off the filter-dryer in the area of the capillary tube;
- Blow again.
Please note when you are dismantling the old filter-dryer, the freon circuit is not left over over 15 minutes. Flooding is over-take a soldering lamp, elbow, put a new filter-dryer. Applying the elaborate, stock up on a three.Layer filter of dehydration. A proven way to extend the life of the refrigerator.
Distinctive features of the shreder valve
Surprisingly: there is no human article describing the device of the Schroeder valve. Some clever men bring confusion, offering to put a nipple of cars. It is lovely, why buy expensive in the garage. Having shoveled the mountain of information, we place the first Runet-explanation why the Schroeder valve is needed. The difference from the nipple is great: when creating a vacuum from the outside, it swings open, dropping pressure. You can connect a gas cylinder. It will go inside. A vacuum pump for pumping the contour contour contents. The flow changes the direction without problems.
The fact that the fact seems so obvious, they forget to explain the amazing skill of the gas station to be able to create pressure to create a pressure in the system and vacuum. Just a service pipe is supplied with a shredder valve, then there is a process on an increase in. It remains to sit, clap his ears. They said the valve is the reverse And it is not quite reverse, more precisely, not at all. The issues that have worried earlier are subsidizing, the repair of the turquoise refrigerators will seem like a light disassembled person.
Refrigerator gas station through the collector freon
Another lovely feature of reviews and dealers is the advertisement of gas stations, often going mutually contrary, completely misses how it works. The first question is why two pressure gauges? One measures the vacuum, in fact, the indications are below zero, as we will see later. Second. It differs little from the first.
Gas station. A universal device, use air conditioners. It is customary to use two pipe:
The process differs from the methodology of using Nord’s refrigerators performing refrigerators. The need to refuel a new product is determined by measuring the difference in temperature of two points when the valve of the filling of the system opens. Two pressure gauges of the gas station are put. It will come in handy when refueling a freon left. Low pressure pressure gauge. The procedure for connecting a gas station:
- The left pipe goes to the valve of the compressor service pipe.
- The middle pipe is connected to the Freon cylinder, the gas station cylinder.
- The right pipe is connected to the vacuum pump.
The crane of the workstation is blocked, the valves of the gas station, cylinder, cylinder are locked. Ready to pump out air.
Note. We believe that the pierced filter-dryer is replaced by the new. The second Schroeder valve installed on the filter of the drainter was used to purge the nitrogen. Atmospheric pressure, the pump is removed.
Open both taps of the gas station, turn on the vacuum pump. After a fixed time, the indication of a low-pressure manometer (left) should fall to a minimum (-30). You can turn off the pump. Close the right valve, the branch will no longer be needed. Please note: the vacuum process lasts 15. 30 minutes, excluding the purge of nitrogen. Strive to completely remove moisture. The old Freon will be released by the compressor oil (wait for the end of the process).
Gas station control is guided by the mass indicated by the tag of the refrigerator. A different type of refrigerant is inscribed. See additional information on the Internet. The filling cylinder is equipped with marks of the mass of the substance, the store spray will have to be weighed in an attached state, after the valve is opened, wait patiently: the desired mass of the refrigerant will fill the contour. Then the valves overlap.
Some information about the search for Freon leaks in refrigerators
Techattors are tuned to each of their own brand Freon. Do not try to detect other damage. I would also like to say, some combine purging nitrogen with the search for leaks, it is wrong. They said that air is pumped into the system of 15. 25 atm, nitrogen no more than 6. Therefore, the leak power will be different in such conditions. The savings of technological operations can go sideways when the filled Freon will calmly flow out in two weeks. It’s not bad to notice on this occasion: after refueling, a test launch of the refrigerator is performed without auging service pipe. The arrow of the left manometer should fall to zero.
After work, the lender once again fulfills its duties. In this case, it is better to play it safe than to be impressed when the refrigerator is fixed with your own hands. We hope that readers will now not try to twist the Schroeder valve nipple, pulling the air, they will simply use the part as intended for the purpose.