The situation when the refrigerator stops freezing and the compressor works without stopping often leaves the owner with a choice: call a technician or try to fix the problem yourself. One of the common causes of loss of cold is refrigerant leakage from the circuit. If you decide to do it yourself, it is important to understand that this is a technically complex process that requires not only special tools, but also strict adherence to safety precautions. refilling the refrigerator with your own hands, it is important to understand that this is a technically complex process that requires not only special tools, but also strict adherence to safety precautions.
Unlike replacing a lamp or defrosting, working with refrigerant is associated with health risks and requires tightness systems. Freon in a closed volume it displaces oxygen, which can lead to suffocation, and upon contact with an open flame, some types of refrigerants form toxic compounds. Therefore, before starting work, you need to make sure that the room is well ventilated and all sources of fire have been removed.
The process of restoring the unit's functionality consists of several critical stages: finding and eliminating leaks, soldering tubes, evacuation of the system and directly filling with gas under a certain pressure. Skipping any of these steps, especially the step of removing moisture and air, will lead to rapid failure of the compressor. Without first eliminating the leak, filling the refrigerator with freon does not make sense, since the gas will escape through the crack again within a few hours or days.
Necessary tools and preparation of the workplace
Quality of work performed directly depends on the equipment used. For a professional refueling the refrigerator it is not enough to just buy a gas cylinder. You will need a specialized set of tools that will allow you to monitor the pressure and tightness of the connections. The absence of any of the components can make the process impossible or dangerous.
First of all, you need gauge manifold (pressure gauge station). This device allows you to monitor the pressure in the system and control the vacuum process. A vacuum pump is also required to remove air and moisture vapor from the circuit. Without a deep vacuum, the remaining moisture will freeze in the capillary tube, forming an ice plug, which will block the circulation of the refrigerant.
An adapter is often required to connect the hoses to the service port and the cylinder, since the threads on household refrigerators may differ from the standard threads of the station hoses. In addition, you will need tools for soldering: a gas torch, solder and flux, if you need to weld the tubes or install a new fitting.
Do not forget about personal protective equipment. Wear gloves and safety glasses. The refrigerant, when released under pressure, has an extremely low temperature and can cause frostbite to the skin or damage to the eyes. Also prepare a soap solution to check the tightness of the connections after completion of work.
Diagnostics of leaks and preparation of the system
Before connecting the equipment, it is necessary to localize the location of the leak. It is almost impossible to visually find a microcrack in a foamed circuit, so craftsmen often focus on indirect signs or use leak detectors. If the leak is found in an accessible place, for example, on lower (the evaporator in the freezer) or on visible condenser tubes, it can be soldered.
The preparation process begins by disconnecting the refrigerator from the power supply. Next, you should carefully bite off the compressor filling tube with pliers (usually it is located on the back wall and has a sealed end). Gas should come out of the tube with a characteristic whistle. If gas does not come out, then the system is sealed, and the cause of the malfunction is most likely not a leak, but a blockage or breakdown of the compressor.
⚠️ Attention: If a sharp pop or whistle is heard when you bite off the tube, this confirms the presence of pressure. However, if you plan to solder, make sure that all gas is completely released to avoid ignition when working with an open flame.
After bleeding off the remaining gas and finding the leak, repairs are made. The tubes are cleaned and the damaged area is sealed with hard or soft solder. It is important not to overheat the tubes so as not to melt their walls. If the leak was in the foamed part, sometimes you have to cut out a piece of thermal insulation, but this requires subsequent high-quality restoration of the insulating layer.
At the next stage, a service fitting (valve) is installed on the filling tube. This allows you to repeatedly connect and disconnect the hoses of the pressure gauge station. The fitting is soldered to the tube, while the valve itself must be kept with a damp cloth or cooled so that the high temperature does not damage its rubber seals.
The process of evacuating the refrigeration circuit
Evacuation is perhaps the most important step in the entire procedure. Many beginners neglect this step, believing that simply venting the air is enough, but this is a fatal mistake. There should be no air or, more importantly, moisture left in the system. Moisture reacts with the compressor oil and refrigerant, forming an acid that corrodes the motor windings from the inside.
To begin the process, connect the blue hose (low pressure) of the pressure gauge station to the service fitting on the refrigerator. The yellow hose connects to the vacuum pump. Open the valve on the blue hose and turn on the pump. The pressure gauge needle should go negative, indicating the creation of a vacuum.
☑️ Checklist for preparing for vacuuming
The pumping process should last at least 30 minutes, and for older models or after major repairs - up to an hour. During this time, moisture in the system in the form of steam boils at low pressure and is removed by a pump. After turning off the pump, it is necessary to close the valve and monitor the pressure gauge readings for 15-20 minutes.
If the pressure gauge needle remains in place (in the vacuum zone), then the system is sealed. If the arrow creeps towards zero, it means that there is a leak somewhere and air is being sucked in. In this case, you need to re-check all solders and connections with a soapy solution. Tightness is the key to a long life of the compressor.
Why can’t you just blow the system with freon?
There is a myth that the system can be “blown out” by releasing a little freon through fitting This is strictly forbidden. Firstly, it pollutes the atmosphere. Secondly, in this way it is impossible to remove moisture adsorbed on the inner walls of the tubes and in the oil. Only a deep vacuum can “pull out” this moisture.
Technology for filling with refrigerant under pressure
After successful evacuation, the moment of charging comes. To do this, the yellow hose of the pressure gauge station is disconnected from the pump and connected to the cylinder c freon. The cylinder should be upside down (if the filling is in the liquid phase through the liquid port, which is faster) or upside down if the filling is through the gas port, but usually for the initial filling the cylinder is placed upside down so that the liquid refrigerant can enter, but the exact method depends on the type of refrigerant and the manufacturer's recommendations.
Open valve on the cylinder and blow out the yellow hose, slightly opening the valve on the manifold to displace the air from the hose itself. Then, with the refrigerator compressor running (it needs to be plugged in), slowly open the blue valve on the manifold. The refrigerant will begin to enter the system.
You need to charge it in small portions. We let in a little gas - closed the valve - waited 2-3 minutes until the pressure equalized, and listened to the compressor work. At the initial stages, you can charge in the liquid phase (cylinder upside down), but when the system is filled and the pressure rises, switch to the gas phase (cylinder upside down) to prevent water hammer in the compressor.
| Refrigerant type | Suction pressure (bar) | Compressor current (%) | Features |
|---|---|---|---|
| R134a | 0.06 - 0.08 | 85-95% | Synthetic oil, afraid of moisture |
| R600a (Isobutane) | 0.04 - 0.06 | 80-90% | Explosive, refueling only at off! |
| R12 (Rarely) | 0.08 - 0.10 | 90-100% | Outdated, high boiling point |
You need to control the amount of refrigerant not only by the pressure gauge, but also by the current consumption of the compressor (using current clamps) and by the condenser temperature. The condenser tubes (black grille at the back) should be heated evenly, approximately 2/3 of their length, and the last third should be slightly warm or at room temperature. Refilling as harmful as underfilling: it leads to increased energy consumption and liquid shock.
Features refilling R600a refrigerators
Modern refrigerators are increasingly refilled with refrigerant R600a (isobutane). It is an environmentally friendly gas, but it has one critical feature - high flammability. Unlike R134a, which is inert, isobutane in a concentration of 1.3-8.2% in air forms an explosive mixture.
When working with R600a, it is strictly forbidden to turn on the soldering torch if there is a smell of gas in the room. All soldering work must be completed before opening the refrigerant cylinder. In addition, the amount of gas charged in such systems is very small (often only 30-50 grams), so an error of 10 grams can be fatal to performance.
⚠️ Attention: It is recommended to refill R600a only with the refrigerator unplugged, using a scale to accurately dose the mass, rather than relying solely on pressure. The pressure of R600a is very low, and the pressure gauge may give a large error.
For R600a, compressors with increased tightness are often used. When replacing a compressor or capillary tube in such systems, it is often necessary to replace the filter-drier, since the old one could become saturated with moisture and stop performing its function. The filter is changed quickly to minimize contact of the internal parts of the system with atmospheric air.
Control check and sealing
Once the required pressure and current have been achieved, it is necessary to carry out a final check. Turn on the refrigerator and let it run for at least 15-20 minutes. Check the temperature in the freezer - it should begin to drop steadily. The evaporator inside the chamber should be covered with a uniform layer of frost.
Moisten the sponge generously with soapy water and go over all soldering areas, fittings and connections. The appearance of even small bubbles indicates a leak. If the system is sealed, we proceed to sealing the filling tube.
Clamp the copper tube above the fitting with a clamp (or pinch it with pliers if the tube is soft) so that the gas does not escape. Quickly unsolder the service valve. Due to the pressure inside the tube, the gas will escape a little, so you need to solder quickly and carefully. The end of the tube is bent and sealed “tightly” with hard solder.
The final touch is to check the operation of the refrigerator in normal mode for several hours. Make sure the compressor switches off when the set temperature is reached. If the unit “threshes” without stopping, there may be air left in the system (poor vacuuming) or a blockage has occurred.
Frequently asked questions (FAQ)
How much freon is needed to refill a regular refrigerator?
The exact amount is indicated on the technical sticker, which is usually located on the back wall of the refrigerator or inside the chamber. Weight varies from 30 grams (for R600a) to 150 grams (for large two-compressor R134a models). You cannot refill “by eye.”
Is it possible to refill a refrigerator with regular car freon?
No, this is strictly prohibited. Refrigerators use refrigerants with certain thermodynamic properties (R134a, R600a, R12). Automotive freons (often mixtures) have a different oil and can destroy the compressor of a household refrigerator.
Why does the refrigerator not freeze after refueling?
There may be several reasons: there is air or moisture left in the system (poor evacuation), a blockage has formed in the capillary tube, the compressor itself is faulty (low compression) or an error has been made in amount of refrigerant (underfilling/overfilling).
Is it necessary to change the filter-drier when refilling?
If the system has been opened (there was a leak, the compressor or tubes have been changed), it is necessary to replace the filter-drier. It is a disposable element and, after contact with air, loses its ability to absorb moisture.