Owners of refrigeration equipment are often faced with the need to clarify the technical characteristics of their equipment, especially when it comes to refrigerants. The question of what kind of freon is used in the Stinol refrigerator becomes critical when planning repairs or preventive maintenance. Not only the cooling efficiency depends on the type of gas, but also the safety of work, as well as the cost of restoring the functionality of the unit.
The Stinol brand range covers several decades of production, during which various refrigerantswere used. Early versions could contain substances that negatively affect the ozone layer, while modern analogues are environmentally friendly. Understanding the difference between them helps to avoid mistakes when diagnosing malfunctions, such as insufficient cooling or complete compressor failure.
In this article we will take a detailed look at what types of gases are used in different series of refrigerators, how to independently determine a leak and why replacing freon requires a professional approach. You will receive comprehensive information about pressures, charging rates and operating features of systems with different refrigerants.
Main types of refrigerants in Stinol refrigerators
The history of the brand has many modifications, and during this time engineers have used various substances for heat exchange. The most common in old and middle-aged models is R134a (tetrafluoroethane). This is a colorless, odorless gas that replaced R12 freon. It is not flammable, but requires the use of synthetic oils and is characterized by a higher operating pressure in the system.
It is often found in more modern models, especially built-in series and Eco-class units. isobutane R600a. This hydrocarbon compound has excellent refrigeration properties and minimal environmental impact. However, its main feature is its high flammability, which imposes strict restrictions on repair work and requires special attention to the tightness of the circuit.
The differences between these gases are fundamental. If you try to use a different gas in a system designed for R134a, the compressor may fail due to oil incompatibility or pressure differences. Therefore, before starting any work, it is necessary to accurately identify the type of refrigerant indicated on the technical label.
⚠️ Attention: Never mix different types of freons. This will lead to a chemical reaction, the formation of acids in the system and guaranteed failure of the compressor in the shortest possible time.
How to determine the type of freon by marking
The most reliable way to find out what gas is pumped into your refrigerator is to study the technical information printed by the manufacturer. It is usually located on a metal plate or sticker. You can find it on the back wall of the case, inside the refrigerator compartment on the side wall, or on the base panel at the front.
On the label you are interested in the column where the refrigerant designation is indicated. It may look like Ref. Gas: R134a or Refrigerant: R600a. Also, the mass of the filling in grams is often indicated there (for example, 130g). This data is critically important for the technician who will carry out the maintenance.
If the sticker is worn off or missing, you can indirectly determine the type of gas by year of manufacture and model. Models produced before the mid-90s most often run on R12 (already banned), models from the late 90s and 2000s use R134a, and equipment from the last 10-15 years often uses R600a. However, relying only on the year of manufacture is risky.
For accurate diagnosis, specialists use a pressure gauge station. The pressure in the rest system at room temperature will differ for different gases. For example, for R134a at +25°C the pressure will be about 6 bar, while for R600a it will be significantly lower. But it is not recommended to carry out such measurements without experience.
What to do if the label is not readable?
If the sticker is damaged, look for the exact model of the refrigerator (for example, Stinol 102 Q) in the operating instructions or on the manufacturer’s official website. The technical specifications are always indicated there, including the type of refrigerant used. You can also find a similar model on the Internet and look at photos of the nameplate from other owners.
Model correspondence table and filling rates
The amount of freon required for the correct operation of the refrigerator is calculated by engineers to the nearest gram. A lack of refrigerant will cause the freezer to stop freezing, and an excess can cause water hammer in the compressor or an increase in condensation pressure.
Below is an indicative table for popular models. Please remember that the data may vary slightly depending on the specific modification and year of production.
| Refrigerator model | Refrigerant type | Charge rate (g) | System features |
|---|---|---|---|
| Stinol 101 L | R134a | 140 ± 5 | Single compressor |
| Stinol 102 Q | R134a | 130 ± 5 | Crying evaporator |
| Stinol 205 | R600a | 85 ± 3 | No Frost |
| Stinol 116 | R134a | 155 ± 5 | Increased volume |
Please note that the filling rate for R600a always significantly less than for R134a, due to the high specific cooling capacity of isobutane. An error in dosage of even 10-15 grams can disrupt the temperature regime.
Refilling is carried out only after the system has been evacuated. Residual air or moisture in the circuit will cause ice to clog the capillary tube or increase pressure, which is dangerous for the compressor. The process requires the use of specialized equipment: a vacuum pump, scales and pressure gauges.
Signs of a leak and system diagnostics
You can understand that freon has left the system by a number of indirect signs. The first alarm bell is often that the refrigerator runs constantly without turning off, but the temperature inside does not drop to the required values. The compressor hums, trying to compensate for the lack of refrigerant.
Another characteristic sign is the lack of cooling in the freezer when the evaporator in the refrigerator compartment is running (or vice versa, depending on the design). There may also be swelling of the side walls of the housing due to corrosion of the foamed evaporator, which is a common disease of older models.
- 🧊 There are no hot spots on the rear condenser grille, it remains cold or slightly warm along its entire length.
- 🔊 The compressor works intermittently, the thermal protection relay often clicks when trying to start motor.
- 💧 The appearance of oily spots under the refrigerator or at the point where the tubes exit the compressor.
To find leaks, technicians use the nitrogen pressure test method. The system is filled with gas under pressure, and the connections or pipes are checked with a soap solution. Bubbles will indicate the location of depressurization. At home, this method is difficult to apply due to the lack of a nitrogen cylinder and a reducer.
Features of replacement and safety measures
Replacing freon is a technically complex process that requires not only skills, but also compliance with safety precautions. This is especially true for models on isobutane R600a. Since this gas is flammable, any spark when working with a power tool in a confined space can lead to ignition.
When working with R600a, it is necessary to ensure good ventilation of the room. All work on soldering copper tubes should be carried out only after thoroughly purging the system with air or nitrogen to displace any remaining flammable gas. The technician must use a non-sparking tool.
⚠️ Attention: Independent soldering of the circuit with isobutane residues is strictly prohibited. This may cause an explosion. Entrust this work only to certified specialists with the appropriate equipment.
The replacement process includes several stages: dismantling the old compressor (if it is burned out), installing a new one, soldering the connection, vacuuming for 30-40 minutes to remove moisture and air, and only then - charging with a precisely measured amount of refrigerant.
☑️ Checking readiness for repair
Why accuracy is important when refilling
Many unscrupulous repairmen offer fill the refrigerator “by eye”, focusing only on the pressure on the pressure gauge. For systems with a capillary tube, which include most Stinol refrigerators, this is a serious mistake. The pressure in the system depends on many factors: ambient temperature, condenser contamination, fan efficiency.
The only correct way to refill is by weight, using electronic scales. An overcharged refrigerator will consume more electricity and the compressor will work overload. An undercharged unit simply will not be able to provide the required temperature.
In addition, it is important to use freon of the same brand that was originally filled, or its complete analogue. Replacing R134a with R12 or R600a requires a complete flushing of the system and an oil change, since mineral and synthetic oils do not mix and have different chemical reactivity.
Frequently asked questions (FAQ)
Is it possible to fill a Stinol refrigerator with freon from a can for refilling car air conditioners?
No, it is not possible. Car air conditioners use R134a freon, but mixed with special oil and additives. Domestic refrigerators use other types of oils (mineral or polyester), and automobile oil entering the refrigeration circuit can cause blockage of the capillary system. In addition, the compositions may differ.
How often do you need to change freon in the refrigerator?
Freon is a working fluid in a closed cycle; it is not consumed during operation. If the system is sealed, one refill is enough for the entire life of the refrigerator (10-15 years or more). Replacement is required only in case of a leak or after repair of the circuit.
How much does it cost to refill a Stinol refrigerator with freon?
The cost consists of the price of the gas itself, the cost of the work of the technician and the visit. For R134a the price is usually lower since the gas is cheaper and easier to work with. For R600a, the price may be higher due to the complexity of working with flammable gas. The technician will tell you the exact amount after diagnosis.
Is R134a freon dangerous for humans?
In small quantities contained in the refrigerator (about 100-150 grams), it is not toxic during short-term inhalation. However, when heated, it can decompose to form harmful substances. At a high concentration in a small room, it displaces oxygen, which can cause suffocation.
Why does the refrigerator freeze poorly after refueling?
There may be several reasons: the amount of freon is incorrectly selected (over- or underfilling), air or moisture remains in the system, the capillary tube is clogged, or the compressor itself is faulty. Also, the problem may not be in freon, but in the thermostat or heat leakage through the seal.