Refrigerators Stinol 101 have earned a reputation as reliable and easy-to-use units, however, even time-tested equipment may require intervention in the operation of the thermoregulation system. If you notice that the food in the refrigerator compartment begins to freeze or, conversely, quickly deteriorates due to insufficient cooling, the problem most often lies in incorrect operation thermostat or a shift in the regulator settings. Unlike modern electronic control systems, mechanical thermostats in this model require physical adjustment or replacement when they fail.
Understanding the principle of operation capillary tube and the actuator will allow you to independently diagnose the malfunction and make adjustments without calling a technician. In this article we will look in detail at how to find the adjusting screw, how to check the serviceability of the sensor and what steps to take to restore the optimal temperature regime.
The principle of operation of the Stinol mechanical thermostat
The basis of the temperature control system in the model Stinol 101 is a mechanical thermostat that responds to changes in temperature inside the evaporator or air damper. Inside the device there is a sealed flask filled with refrigerant, which is connected to the bellows through a thin flask. When heated, the gas in the tube expands, creating pressure on the membrane, which opens the electrical contacts and stops the compressor. When cooling, the process occurs in the reverse order. capillary tube. When heated, the gas in the tube expands, creating pressure on the membrane, which opens the electrical contacts and stops the compressor. When cooling, the process occurs in the reverse order.
The key element for the user is the adjusting screw, which changes the tension of the spring inside the mechanism. By tightening the screw, you increase the force required to open the contacts, which makes the compressor work longer and cool the chamber more strongly. Shifting the adjusting screw even by half a turn can change the temperature inside the chamber by 2-3 degrees Celsius, so calibration requires high precision and accuracy. You should not rely only on the position of the handle on the panel, as over time the mechanical connection may weaken.
It is important to distinguish the thermostat from the defrost sensor, although in some modifications they may be located next to each other. The thermostat controls the cycles of turning the compressor on and off depending on the temperature in the refrigerator compartment, while the defrost sensor controls the heating of the evaporator. Incorrect setting of the first will either lead to a “crying” evaporator or the formation of an ice coat that blocks air circulation.
⚠️ Attention: The capillary tube of the thermostat is made of very thin metal and is damaged. If the tube is handled carelessly or the tube is bent, the system depressurizes, after which the thermostat stops responding to temperature and requires complete replacement.
Why do the settings get lost?
Mechanical thermostats can change their readings over time due to fatigue of the metal spring or moisture getting inside the mechanism. The accuracy is also affected by the tightness of the capillary tube to the evaporator. If the tube has moved away from the surface, the thermostat “feels” the temperature with a delay, which leads to fluctuations in the operating mode.
Diagnostics: when adjustment or replacement is needed
Before you start disassembling and turning the adjusting screws, you need to make sure that the problem lies precisely in the thermostat, and not in a freon leak or malfunction compressor. There are several obvious signs indicating the need for intervention at work thermostat. If the refrigerator operates almost without stopping, and the temperature in the chamber drops below zero, vegetables and milk freeze, this is the first signal that the contacts do not open in time.
The opposite situation, when the compressor turns on rarely and for a short time, also indicates a problem. In this case, the products in the chamber are not cooled to the required temperature, quickly deteriorate, and condensation may appear on the walls of the chamber. Sometimes the thermostat can “stick” in one position, and then the refrigerator either will not turn on at all or will work continuously, ignoring the control knob settings.
For accurate diagnosis, you can use an external thermometer by placing it in a glass of water in the center of the refrigerator compartment. Leave the device for several hours and compare the readings with the set mode. If the difference exceeds 3-4 degrees with a working seal and normal loading, most likely it requires calibration or replacement of the unit.
- 🌡️ The compressor operates continuously for more than 2 hours without going into standby mode, and the temperature in the chamber is lower +2°C.
- ❄️ A thick ice crust (“fur coat”) forms on the back wall of the refrigerator compartment, although the model assumes drip defrosting.
- 🥛 Products in the main chamber are not cooled below +10..+12°C even with the maximum position of the control knob.
- 🔌 The refrigerator does not turn on at all after defrosting, although the network indicator is on and a buzzing sound is heard in the network.
Preparation for setting and access to the thermostat
To carry out work on adjusting or replacing the thermostat in the refrigerator Stinol 101 you will need a minimum set of tools, since The design of these models is quite simple. First of all, it is necessary to completely defrost the unit and disconnect it from the power supply. Work with electrical wiring and mechanical components under voltage is strictly prohibited and can lead to electric shock.
Access to the thermostat in this model is usually achieved by removing the top cover of the refrigerator compartment or dismantling the lampshade, depending on the specific modification and year of manufacture. In some cases, it is necessary to remove the decorative panel above the door. Be careful with plastic latches, as the plastic becomes brittle over time and can crack if handled carelessly.
After removing the panels, you will see the thermostat itself - this is a small box with suitable wires and a capillary pipe going deep into the body. Before touching the screws, it is recommended to photograph the original position of the wires and the markings of the contacts in order to avoid errors in switching during assembly.
☑️ Preparation for adjustment
It is important to ensure good lighting of the work area, since the space above the refrigerator compartment is often dark, and parts small. If you only plan to test the contacts, you may need a multimeter in test mode. To adjust the spring tension, a simple slotted screwdriver is often enough, but some models require a special calibration key.
Step-by-step instructions for adjusting the temperature
The process of adjusting the thermostat in Stinol 101 consists in changing the tension of the spring inside the mechanism, which shifts the temperature threshold. The thermostat housing usually has one or two holes closed with a seal or plastic plug. Through these holes, access to the adjusting screws is provided. One screw is responsible for the switch-on temperature, the other for the switch-off temperature (differential).
To lower the temperature in the chamber (make it colder), you need to increase the spring tension by tightening the adjusting screw clockwise. Typically, one full turn of the screw changes the response temperature by approximately 0.5–1.0 degrees Celsius. Do not make sudden movements: adjustments should be made in small steps, a quarter turn, followed by checking the result.
If your task is to increase the temperature (make it warmer), the screw is unscrewed counterclockwise, relieving the pressure on the bellows membrane. After each manipulation, you must let the refrigerator run a full cycle (turn on, cool the chamber and turn off) to ensure that the settings are correct. The process may take several hours, so be patient.
| Action | Rotation direction | Result | Recommended step |
|---|---|---|---|
| Increasing cold | Clockwise (+) | The compressor runs longer | 1/4 turn |
| Reducing the cold | Counterclockwise (-) | The compressor turns off earlier | 1/4 turn |
| Narrowing of the differential | Adjusting the second screw | Frequent on/off | Only for pros |
| Resetting settings | Return to original position | Standard operating mode | Full cycle |
⚠️ Attention: Do not try to adjust the differential (the difference between on and off temperatures) without special instruments. Incorrect setting of this parameter will result in the compressor turning on too often (which harms the start relay) or running for too long without interruption.
Checking the serviceability and replacing the thermostat
If adjusting the screws does not bring results, or the contacts inside the thermostat are burnt and do not conduct current, the device must be replaced. In refrigerators Stinol 101 most often thermostats of the TAM series or similar imported analogues are used. Before purchasing a new part, be sure to compare the length of the capillary tube and the location of the contacts on the old and new thermostat.
You can use a multimeter to check the serviceability of the old thermostat. At room temperature, the contacts should be closed (unless it is a thermostat with forced opening when heating, which is rare for a refrigerator). When the sensitive element is cooled (for example, by applying it to a piece of ice or spraying refrigerant from a can), the contacts should open with a characteristic click.
The replacement process involves disconnecting the wires, carefully removing the capillary tube from its seat in the evaporator and installing a new unit. It is important to properly secure the capillary tube in the evaporator channel using standard clamps or thermal paste for better heat transfer. Poor contact of the tube with the evaporator will lead to incorrect operation of even a working thermostat.
- 🔍 Visually inspect the contacts: the presence of carbon deposits or melting of the plastic indicates the need for replacement.
- 📏 Measure the length of the capillary tube: it must correspond to the original, otherwise it will have to be carefully bent, preventing creases.
- 🧪 Check the tightness: any traces of oil or rust on the bellows indicate depressurization and loss of sensitivity.
Typical errors during setup and operation
One of the most common mistakes is trying to adjust the temperature when the refrigerator is not completely defrosted. Remaining ice on the evaporator distorts heat transfer, and the thermostat reads incorrect data. As a result, after complete defrosting and adjustment, the refrigerator may begin to operate in a non-optimal mode.
Another common mistake is ignoring the condition of the door seal. If the rubber band does not fit tightly, warm air constantly enters the chamber, and the thermostat, trying to compensate for heat loss, forces the compressor to work continuously. Owners turn the adjustment screws, trying to “deceive” the system, but the problem is solved only by replacing the seal.
Also, do not forget about loading the camera. An empty refrigerator cools faster, but it also heats up instantly from warm food. Settings made on an empty chamber may require adjustments after the chamber is fully loaded with food. Try to carry out the final calibration at your usual load.
Is it possible to use a thermostat from another model?
You can use an analogue from another model, but only if several critical parameters match: the response temperature (marking on the body, for example, -12..-24°C), the length of the capillary tube and the location of the contacts. Installing an unsuitable thermostat can lead to incorrect temperature conditions or failure of the defrost system.
Why does the refrigerator not turn off after replacing the thermostat?
If after replacement the refrigerator runs without stopping, perhaps the new thermostat has different operating parameters, or the capillary tube is not immersed deep enough in the evaporator. Also check if the wires are mixed up when connecting, and make sure that there is no freon leak in the system.
How often do you need to change the thermostat in Stinol 101?
The service life of a mechanical thermostat is on average 5-7 years of intensive use. However, if used correctly and without power surges in the network, it can last 10 years or more. Scheduled replacement is not required, only in the event of a malfunction.
Does the room temperature affect the operation of the thermostat?
Yes, mechanical thermostats are sensitive to ambient temperature. If the refrigerator is in an unheated room at a temperature below +10..+15°C, it may not turn on at all, since the temperature in the chamber and outside is equalized, and the spring does not expand. For such conditions, special thermostats or climate class SN-T are required.