How to bleed excess freon from the refrigerator

Refrigerator charging for 500 with no equipment

All that the story in this article is only experimental and is not a call to action, do not try it at home, it will not end well anyway, and if there are any problems call your refrigerator repairman, which you can choose here.

bleed, excess, freon, refrigerator

Most people have heard at least once about freon and that it “leaked”, even there are customers who in a phone call telling how under the refrigerator they found a puddle and convinced that it was freon, to change their minds is very difficult. Freon is actually in the liquid phase only at high pressure and at atmospheric pressure the bond between the molecules is low and they fly apart turning into a gas (without color and odor), but for the convenience of pronunciation masters say that freon is leaked, and customers take it literally.

Many customers ask us a question. “why is it so expensive to recharge the fridge” and we decided to try to recharge the fridge without tools and with a budget of 500

What we will need?

1) Gas. to find freon not in specialized store not such simple problem, but if you know that freon, for example R600a, you can easily find the necessary one for 100-150 in the nearest store, the main thing to make sure that at least 80% of the content is izobutane, not confused with propane or butane, I need exactly the IZO

2) torch. it can be found in the same store, most importantly take a valve, which we will need for further charging, 250 3) Solder. best of all use P-14, as tin and all radio solder can not apply, why not I think you can tell the master in the Комментарии и мнения владельцев, I would be very grateful to them for this. 20 4) Hose (see “Hose”). Video) 100 5) Two shredder valves 100

Filling procedure

The first thing you need to prepare the workplace, to unroll the fridge conveniently, unplug from the socket. Since we do not have a pipe cutter, we will use an improvised tool which we use to bite off the service tube and put it on the hose, seal the connection and put the second end on the burner, open the freon and wait 5-10 minutes. After that we switch off the bottle and bleed all the gas back, we do it to reduce concentration of air and moisture in the system. During normal filling it is necessary to change the filter-dehydrator, which traps moisture but we have a budget experiment so we deliberately omit this point. After our test batch, we start the final filling, pump the pressure up to the maximum and turn on the compressor, having previously shut off the tap on the burner. Now we need to achieve a boundary condition of formation of condensation on the pipe of low pressure, observe it for 30-60 minutes and a little adding freon, if necessary.

If the tube began to freeze, then turn off the compressor and wait 5 minutes, then a little gas drain and repeat the procedure Ideally filled refrigerator has a condenser temperature (black radiator on the back wall) 55 degrees at the beginning and 45 degrees at the end(at the filter-dryer)

Acquire skills on repair of refrigerators it is possible on our course And for professional and qualitative repair you will need the minimum set of the refrigerator

-Freon R134(old refrigerators) and R600(new refrigerators) in very rare cases R12 is found, but to begin with I advise not to mess with such mammoths.Vacuum pump (for domestic refrigerator it is enough 40-70 liters productivity, less weight and more convenient for departure, more pumps faster, there are also druhstage ones which create bigger vacuum, but for domestic refrigerators they are not needed).Monometric station (you can take one monometer, ruler of gas is not principal, you need to fill by pressure).Solder P14 (the most universal, because it can be soldered both copper and iron with copper, aluminum in the first year of operation, I would not recommend soldering).Weighing scale with accuracy to 1 gram (when working with small cylinders, I already showed you how to pour in the last video).Set of filters-dehydrators (depends on quantity of orders, to change at each filling).Shredder valve (depends on quantity of orders, change at every filling).Pipe cutter (small enough to fit everywhere)

Do not forget that for the members of the club SW19 in the store TexnoMag very low and a lot of additional conditions, so look for the entry button for the wizard in the store.

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Leak detectors. specialized tools for professionals

A halide leak detector, which is only sensible to use if there is chlorine in the refrigerant, is more of an industrial unit, and although it is inexpensive, it is unlikely to pay for itself. The use of such an apparatus allows to determine the leakage even if it is not more than 150 grams/year, but it is still less effective than its electronic counterpart and during its use the maximum caution is required in order not to be exposed to dangerous vapors and open flame, the color change of which is indicative of the leakage.

Electronic leakage detectors also work with specific kinds of the refrigerant, and are mostly used together with other methods. testing with the help of soapy solution or pressurization with the help of nitrogen. These devices are more accurate (they can detect leaks up to 3 grams/year), but are expensive, especially considering the short life span. There are also leak detectors detecting the place of leakage with ultrasound scanning, but they are more expensive than other two types of equipment, they show better results when interacting with nitrogen, and they require keeping quiet while checking.

Is a Freon leak dangerous in a refrigerator

In small concentrations, refrigerants are not dangerous to human health. It is impossible to reach high concentration in case of freon leakage from the fridge for three reasons:

  • Refrigerant is heavier than air and will not accumulate at respiratory level;
  • Not enough CFCs in the refrigerator to reach high concentrations;
  • The natural convection will not allow the whole quantity of the leaked gas to accumulate in one room (except in the basement).

Leaks due to large breaks pose a risk. In such cases, the gas comes out at once in full volume. Although freons are not explosive, they can be ignited by contact with an open flame, a hot surface, or an electrical discharge.

You can read more about the properties and dangers of gases in the articles:

How to drain freon from a fridge?

About how to disassemble the refrigerator for scrap metal was told earlier, as it turns out, there is nothing complicated in this work. In this article will be told about how to remove the compressor from the refrigerator, whether such an event is dangerous and how easy it is to disassemble the compressor on copper.

Theory

Why do we need freon?

The most important element in the technical component of refrigeration equipment is the gas intended for maintaining low temperatures and freezing food. Without this component the unit loses its functionality.

It is worth remembering that the refrigerant is odorless, and therefore you can only judge the presence of problems in the cooling system and evaporation by the temperature inside the unit.

It is also flammable and poisonous. Be sure to ventilate the room after operation.

Always use only the right brand for your unit.

Causes of leakage

Basic factors for depressurization of refrigeration equipment:

How to diagnose a leak by yourself

There are signs that can be used to judge a leak without the need for special equipment:

  • Poor refrigeration or freezing of food only in one local area;
  • Continuous operation of the compressor or with small pauses between cycles;
  • Complete shutdown of the compressor motor;
  • Strange gurgling sounds.
  • Alarm indication or beeping;
  • An ice or snow coat around the evaporator;
  • Rusty leaks around the perimeter of the door;
  • Enclosure wall bloat.

Fill the refrigerator with freon with your own hands

The main types of breakdowns concern the freon circuit. Refrigerant leaked, refrigerator stopped freezing. The Whirlpool is not much different from the others. Try to know the structure of the refrigerator in order to make repairs. Afraid of the terms compressor, filter-drier, there is nothing to do inside.

Purpose of the Schroeder valve

When the master comes, the first thing he will do is to check the freon circulation system for leaks. How to make? Leak detector set to look for freon, contents leaked, how to look? Got it. Let’s fill the circuit with air, creating pressure. Theoretically consider air containing freon impurities, practically the second component is excluded by the master outright (expensive), the pitiful remnants the system contains. You’ll get the right mixture.

How to keep it inside? We’ll need a Schrader valve. It is connected to the service connection of the compressor. The Schroeder valve is reported to be a nipple. Only difference is limited by good low temperature tolerance. There is a second difference, we will mention below. Bypassing the Schrader valve, air is pumped inside by the compressor. It’s the leak detector’s turn. Found cracks are localized, sealed. Vacuuming, charging.

The air pressure of the freon circuit is:

Bleeding the air, blowing out the freon circuit of the fridge with nitrogen

Modern freons don’t do any harm to the environment, the excess is usually dumped by emptying the circuit outside the window. Taking all safety precautions. Needle grip needed. Device enclosing the filter drier in a vice, afterwards the copper is pierced with a clamping screw. Node comes into disrepair, charging freon, it is customary to replace with a new one. Let’s take a hose outside, open a valve, wait, to bleed excess pressure. The service life of the refrigerator exceeds the performance of the freon circuit, the diligent owner should know the order of performing the charging.

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Then purge with nitrogen. Dry gas helps remove any remaining moisture by cleaning the system. Because the Schrader valve is on, the gas inlet is open. The outlet is on the filter-drier through a needle grip. Make sure that the pressure of the nitrogen cylinder is below the 6 atm mark. If you notice an excess, use a pressure reducer:

  • purge the refrigeration unit for some time;
  • Close the needle grip valve;
  • cut the filter drier near the capillary tube;
  • Re-blow.

Note, when dismantling the old filter-dehydrator, do not leave the freon circuit open for more than 15 minutes. Blowing is finished, take the blowtorch, the lokrings, put a new filter-drier. When using isobutane, stock up on a three-layer dehydration filter, a proven way to extend the life of your refrigerator.

Distinguishing features of the Schrader valve

Amazing: there is no human article describing the Schroeder valve device. Some clever people bring confusion by suggesting to put a nipple auto. Lovely, why buy the expensive stuff in the garage. Having dug through a mountain of information, here is the first runet explanation of why we need a Schroeder valve. The difference from the nipple is great: when you create a vacuum from the outside, it swings open, relieving the pressure. You can connect a gas cylinder. will pass inside. a vacuum pump to pump out the contents of the freon circuit. The flow changes direction with no problem.

The fact seems so obvious to refrigeration masters that they forget to explain the amazing ability of the filling station to create pressure in the system and vacuum. Simply the service nipple is supplied with a Schrader valve, then the process goes on incrementally. It leaves you sitting there, flapping your ears. They said the valve is reverse And it’s not really reverse, or to be more precise, not at all. The questions that troubled earlier disappear, the repair of refrigerators Biryusa will seem easy to a person who understands.

Filling a refrigerator through a freon manifold

Another adorable feature of reviews and dealers becomes the advertising of charging stations, often going against each other, completely omits to tell you how it works. The first question. why two gauges? One measures the vacuum, actually reads below zero, as we will see later. The second is not much different from the first.

Filling station. universal device, is used when filling the air conditioners. It is accepted to use two spigots:

The process differs from the method of use by the Nordic master refrigerator repairman. The need to fill a new product is determined by measuring the temperature difference between the two points when you open the valve to fill the system. Two charging station pressure gauges are put. Will come in handy when filling the freon left. Low pressure manometer. Filling station connection procedure:

  • Left spigot is coming out on the Schrader valve of the compressor service spigot.
  • Middle connection to freon tank, charging cylinder.
  • The right-hand pipe is connected to the vacuum pump.

Cocks of work station blocked, valves of charging cylinder and bottle blocked. Ready to evacuate.

Note. Consider a punctured filter drier replaced with a new one. Second Schrader valve installed on filter drier was used to purge nitrogen. Pressure is atmospheric and pump is away.

Open both taps on filling station, switch on vacuum pump. After a fixed time, the reading on the low pressure manometer (left) should fall to a minimum (-30). Pump can be shut off. Close right valve, branch is no longer needed. Note: the evacuation process lasts 15 to 30 minutes, excluding purging with nitrogen. Try to remove all the moisture. Compressor oil will be leaking old freon (wait for the process to finish).

Checking the charge is guided by the weight indicated on the refrigerator’s tag. A different type of the refrigerant is written look for additional information on the Internet. Filling cylinder is provided with marks of mass of the substance, the bottle has to be weighed in the attached state, after opening of the valve to wait patiently: the necessary mass of the refrigerant will fill the contour. Then valves are closed.

What about the schrader valve?? Freon pressure on both sides will slam the valve, stop venting, turn to a closed state. It’s time to squeeze the service connection, cut the Schrader valve, solder the gap. Often people are interested in the following question: some part of entered freon remained in charging hose This is really unrecorded problem, it is not discussed in literature in any way. We believe that charging mass on the fridge label is indicated with the account of losses.

Self-repair of the refrigerator

often the refrigerator does not freeze. Rarely, the opposite situation occurs, explained mainly by the breakdown of the thermostat, which does not give a command to the compressor in time to stop working. Possible indirect circuit when the processor collects sensor readings, with one malfunctioning. For example, a simple thermistor is placed in the Liebherr. If it fails, the ice builds up on the back wall of the refrigerating chamber with a layer of several centimeters. Much more often the independent repair of a refrigerator looms on the horizon in case of freon leakage. It is important to know a number of rules that apply in such cases.

When the refrigerant decreases, there are problems with the heat balance, because less heat is required for evaporation. Most often the leakage is caused by violations of the rules of equipment use. You can determine the malfunction yourself by the following signs:

  • Refrigerator frosts weakly. Noticeable increase in temperature, products are not being cooled sufficiently.
  • Motor runs without stopping. Reduction in the refrigerant portion increases the load on the motor.
  • Compressor stops working. This is the first sign that the equipment is out of gas.
  • The compressor is covered with a thick layer of freezing liquid. The doors begin to rust, after the moisture level rises.
  • Indicators change color. Error code messages appear on displays.
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Another homemade method of defrosting and drying the equipment. If at the second start the chamber does not reach the temperature necessary for cooling, it means that all the gas has evaporated and you need to call a repairman.

It is possible to define a malfunction without equipment by external signs. But only a master can confirm the problem by conducting a diagnosis, and determine how to fix the refrigerant leak in the refrigerator.

complicated repairs

When there is a serious breakdown of the refrigerator, you should immediately contact a master. A timely response will extend your operating time and help you avoid costly repairs, such as to your compressor or refrigerant circulation system.

Changing the refrigerant

Freon leakage is one of the most common failures.

To fix the problem, a handyman needs to:

  • Using special equipment, find the place of the leak;
  • Repair the damage and check for leaks;
  • Refill the tank with freon.

Learn more about this type of repair in this article.

The control board is burned out or glitchy

Modern refrigerators are equipped with a control board. It is responsible for the display, maintaining the optimum temperature mode, turning on the light when the chamber is opened, starting the compressor and fan. Restoring performance is usually a matter of re-flashing the module, because due to power surges, non-volatile memory glitches and sometimes mashes up data. If the board is burned out, a new part is installed, repairs are not economically feasible.

If the thermostat is broken

When the thermostat fails, it must be removed and a new similar one installed in its place.

Evaporator defect

The evaporator defect is manifested by an increase in temperature inside the refrigerator compartment, the appearance of an unpleasant odor and an ice coat. Masters search for freon leakage, restore tightness of pipes and perform refrigerant topping up. If the evaporator is worn out, it must be replaced.

Advanced Refrigeration. Charging

Temperature sensor glitches

Eliminate incorrect operation of temperature sensors can be done in several ways.

  • Repair broken control circuit contacts.
  • Eliminate the effects of oxidation (clean the rust).
  • Restore normal position of sensors.
  • Replacement as a complete unit, since the module is not repairable.

Temperature fuse blows

Blowing of the temperature fuse can occur because the evaporator defrosting coil overheated. And to protect the appliances from fire, the fuse broke the circuit.

Ideally, check the resistance of the part with a multimeter, or at least test it. If a circuit breakage is detected, the heating element is replaced with a complete new one. You can try “nalkhozhit”, having closed the circuit with a wire of suitable cross section, but how long would such a design live and whether it is safe. no answer.

NoFrost System Faults

Functionality of the fan is checked manually. gently twist the blades, if the impeller freely rotates, check the electronic part. Diagnose engine starter, if there is a break in the winding, replace the whole. The fuser may be out of order. remove this part and check it with a tester. If the resistance is close to zero, the part is considered serviceable. If both technical parts work properly, the timer needs to be replaced, it can not be repaired.

The ice generator does not work

It is impossible to determine without diagnostics the cause of ice generator failure.

  • Low water pressure;
  • The inlet valve is broken;
  • The alternator unit is defective;
  • The door switch does not work properly;
  • You need to change the filter.

Compressor Repair

Compressor reanimation is one of the most expensive operations.

Replacement in its entirety

In most cases the compressor can not be repaired, so it must be replaced. For this order a suitable model and install it yourself or call a master.

Problems with the starting relay

In the starting protection relay contacts can jam, the coil of the electromagnets can burn out, and the spring plate over time loses elasticity. You usually hear clicks, but nothing happens. If the part is not completely out of order, the coil is repaired, the contacts are connected or cleaned. The easiest way is to throw out the old one and buy a new one for 500-1000 and not waste a lot of time looking for “phantom pains”.

Thermal protection relay breakage

If the thermal protection relay breaks, on/off cycle of equipment is violated, the electric motor overheats. Repair is allowed if the stem is jammed. If there is damage on the winding, the part will be replaced.

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