When the compressor in the refrigerator stops turning on or, conversely, it works non-stop, turning the chamber into an ice bunker, the first thought is often a breakdown of the motor itself. However, in most cases, the culprit of such symptoms is thermostatic regulator, which simply stops sending a signal to start. For a huge number of household refrigerators, especially models of Soviet and post-Soviet production, the series thermostat has become the de facto standard. Understanding which units it is intended for will save you time on searching for spare parts and will allow you to avoid buying the wrong control element. K-59. Understanding exactly which units it is intended for will save you time searching for a spare part and will allow you to avoid buying the wrong control element.
This device is responsible for maintaining the set temperature in the refrigeration chamber, opening and closing the electrical circuit depending on the heating of the sensitive element. The K-59 thermostat has a specific length of capillary tube (usually 2.5 meters), which makes it unsuitable for replacement with models with shorter or longer tubes without physically modifying the case. If you notice that food has begun to deteriorate or freeze faster than usual, diagnostics should begin with checking this unit. In the article we will analyze in detail compatibility, technical nuances and the process of self-replacement.
Main purpose and principle of operation K-59
Thermoregulator K-59 (often labeled as TAM-133) is an electromechanical device designed to automatically maintain temperature in the range from 0 to -24 degrees Celsius. Its main task is to control the operation of the compressor. When the temperature in the chamber rises above the set threshold, the bellows inside the thermostat expands and closes the contacts, starting the motor. When the desired cold is reached, the reverse process occurs and the circuit opens.
The key feature of this series is the presence capillary tube 2.5 meters long, which is filled with refrigerant. It is this length that allows the thermostat to be used in refrigerators with a top or bottom freezer, where the sensor must be lowered deep into the evaporator or mounted on the chamber wall. The design is considered classic and is highly reliable, although over time the mechanical contacts may oxidize or stick.
It is important to understand that a thermostat is not just a switch, but a device for adjusting the climate in the chamber. An incorrectly selected analogue can lead to the refrigerator not freezing or, conversely, turning on too often, which will quickly damage the compressor. Therefore, knowledge of the exact modification and scope of application is critical for high-quality repair of household appliances.
Compatibility: for which refrigerators is it intended?
Thermostat K-59 (or its imported analogue TAM-133) is a universal solution for a wide range of refrigeration equipment. First of all, it was created for two-chamber refrigerators, where temperature control in the main compartment is required. Thanks to the tube length of 2.5 meters, it fits perfectly into the design of most models produced in Russia, Ukraine, Belarus, as well as many foreign brands assembled in the post-Soviet space.
Most often this thermostat can be found in the following lines equipment:
- ❄️ Atlant (Minsk): the vast majority of two-chamber models of the 400, 420, 450, 600, 800 series.
- ❄️ Stinol: models 101, 102, 103, 104, 106, 110, 116, 118, 124, 125, 132.
- ❄️ Nord: almost all two-chamber modifications with a bottom freezer.
- ❄️ Indesit and Ariston: many models produced in factories in Russia and Italy in the 90s and 00s.
- ❄️ Biryusa: modern two-chamber versions.
It is worth noting that for single-chamber refrigerators (where the freezer is located inside a common chamber and is separated only plastic door) a thermostat K-50 with a shorter tube (0.75–1.3 m) is more often used. Installation K-59 into a single-chamber unit is possible only if the excess tube is carefully laid out, but it was originally designed specifically for separate systems. If you are changing a part in an imported refrigerator, always check the markings: the original number may differ, but the physical size and temperature conditions must be the same.
Deciphering the markings and technical characteristics
So as not to get confused a sea of symbols, it is necessary to understand the logic of marking domestic and imported thermostats. The letter "K" in the name K-59 indicates a series designed for refrigeration equipment, and the number "59" indicates a specific modification with a certain temperature range and tube length. The imported analogue is most often the model TAM-133, where "TAM" means a thermostat for refrigerators, and the numbers indicate the standard size.
Main technical parameters that are worth paying attention to attention:
- 🌡️ Capillary tube length: 2.5 meters (standard for K-59/TAM-133). This is a critical parameter for installation.
- ❄️ Temperature range: contact opening at -12...-14°C, switching on at -20...-22°C (depending on setting).
- 🔌 Switching capacity: usually up to 16 Amperes at a voltage of 250 Volts, which exceeds the needs of household compressors with a margin.
- 🔧 Mounting type: standard plate with three holes for screws and a flat contact group.
There are modifications with letter indices, for example, K-59-L-1 or TAM-133 K-5.9. The letter "L" often indicates the presence of a special stem or a modified bellows shape, but in 95% of cases they are interchangeable with the basic version. The main thing is that the operating temperature schedule coincides. If you install a thermostat from a chest freezer (for example, the K-50 or K-52 series, but with other parameters), the refrigerator will not work correctly.
Can I use K-59 instead K-57?
Technically it is possible to install, but K-57 has a different tube length (often 3 meters) and can be designed for lower temperatures. This will lead to incorrect operation or impossibility of installation without modifications.
Correspondence table of models and analogues
When searching for spare parts in stores, you may encounter different names for the same device. Manufacturers label their products differently, but functionally they are the same unit. Below is a table that will help you compare domestic markings with imported ones and understand which series of refrigerators they are suitable for.
| Domestic marking | Imported analogue | Tube length | Application |
|---|---|---|---|
| K-59 L 1136 | TAM 133 K-5,9 | 2.5 m | Atlant, Stinol (2-chamber) |
| K-59 L 1950 | TAM 133 K-5,9 | 2.5 m | Nord, Biryusa |
| K-50 L 1330 | TAM 112 K-5,0 | 0.75 m | Single-chamber refrigerators |
| K-57 L 1416 | TAM 125 K-5,7 | 3.0 m | Freezer cabinets, chests |
As can be seen from the table, K-59 occupies its niche of two-chamber systems. Trying to replace it with K-50 (for single-chamber) will result in the tube being too short, and you simply will not reach the sensor to the evaporator. Otherwise, if the tube is too long (like K-57), it will have to be rolled into a coil, which can disrupt heat transfer and lead to false temperature readings.
When ordering spare parts through online stores, always indicate not only the refrigerator model, but also the markings of the old thermostat, if it is readable. This will allow the consultant to select the most accurate analogue. As a last resort, you can always use universal thermostats with adjustable tube length, but they require more complex settings.
Fault symptoms and diagnostics
How to understand that it is the thermostat that has failed, and not the compressor or start relay? There are several telltale signs that indicate a problem with the temperature controller. The most obvious symptom is that the compressor is silent, although there is voltage in the network and the light inside the refrigerator is on. In this case, the circuit does not close, and the motor does not receive a command to start.
The second failure option is Continuous operation the refrigerator. The unit hums for days, the freezer becomes overgrown with a fur coat, and the food in the main compartment freezes. This means that the contacts inside the thermostat are “stuck” in the closed position, and the device does not sense that the desired temperature has already been reached. The third sign is incorrect adjustment: turn the knob from minimum to maximum, but the characteristic opening click does not occur.
☑️ Thermostat diagnostics
⚠️ Attention: You can carry out diagnostics by shorting the wires Only if you have experience working with electricity. Make sure the wires do not touch the chassis to avoid short circuit. If you are not confident in your abilities, it is better to call a specialist.
It is also worth checking the condition of the capillary tube. If traces of oil or mechanical damage are visible on it, it means that the tightness of the system is broken, the freon inside the tube has evaporated, and the bellows no longer responds to temperature changes. In this case, repair is impossible - only a complete replacement of the unit is required.
Step-by-step instructions for replacing the thermostat
Replacing the thermostat K-59 is a procedure that you can do yourself, if you are careful. The first step is to completely turn off the power to the refrigerator by removing the plug from the socket. Then you need to gain access to the regulator installation location. In most two-chamber models (Atlant, Stinol), the thermostat is located inside the refrigerator compartment, behind a plastic cover on the side wall or under the top shelf.
The replacement process is as follows:
- Remove the temperature control knob (it may fit tightly, sometimes you need to pry it off flat-head screwdriver).
- Unscrew the mounting screws and remove the plastic casing to release the thermostat.
- Take a photo of the wire connection diagram or sketch it, since the color markings may differ between manufacturers.
- Disconnect the wires from the contacts of the old thermostat. Be careful not to damage the insulation.
- Carefully remove the old capillary tube from the hole in the chamber wall. It can be attached with clips or simply lie in the groove.
Sequence of actions:
1. Turn off the power → 2. Remove the handle → 3. Unscrew the casing → 4. Disconnect the wires → 5. Remove the tube
Installing a new one K-59 proceed in reverse order. Insert the capillary tube into the same hole, being careful not to bend it at an acute angle and damage it. Attach the thermostat housing to the seat, connect the wires according to your diagram. After assembly, turn on the refrigerator and check its operation. The first cooling cycle may take longer, since the system needs to return to operating mode.
⚠️ Attention: The capillary tube is very thin and fragile. Do not bend it under any circumstances or allow creases to appear. This will lead to depressurization and failure of the new part immediately after installation.
Frequently asked questions (FAQ)
Is it possible to install the K-59 thermostat in a single-chamber refrigerator?
Technically this is possible, since The electrical part is compatible, but the length of the capillary tube (2.5 m) is excessive for a single-chamber model. You will have to carefully roll the excess tube into a ring inside the case or behind the back wall, which requires disassembling the refrigerator. It is easier and more correct to use the native K-50.
What is the difference between the K-59 and the TAM-133?
In fact, these are the same device. K-59 is a GOST marking (made in Belarus, Russia), and TAM-133 is an international designation (often made in Italy, China, Türkiye). They are completely interchangeable if the length of the tube is the same.
Why does the refrigerator not turn off after replacing the thermostat?
There may be several reasons: the temperature range is incorrectly selected (a “warmer” breaker is needed), the thermostat is not fully seated, or the problem is not in the thermostat at all (for example, a freon leak or a malfunction compressor). Also check whether the tube does not touch the hot parts of the unit.
Where is the thermostat located in Atlant refrigerators?
In most Atlant models, the thermostat is located inside the refrigerator compartment. You need to remove the top shelf or look under the lampshade (depending on the series). It is closed with a plastic cover, which is secured with screws or latches.
How long does the K-59 thermostat last?
The average service life of a high-quality thermostat is 5–7 years of active use. However, with frequent power surges or mechanical damage (shocks during transportation), it may fail earlier. Regular defrosting prolongs the life of the appliance.