Refrigeration equipment of the brand Stinol is deservedly popular due to its reliability and simple but effective design. The key element that ensures the maintenance of the specified temperature in the chamber is the thermostat. It is this component that is responsible for the timely switching on and off of the compressor, preventing both defrosting of food and their deep freezing. Understanding the principles of its operation is necessary for every owner who wants to extend the life of his equipment.
Unlike the complex electronic control systems that modern models are equipped with, classic refrigerators Stinol use a mechanical operating principle. This makes the device maintainable and understandable even for a non-specialist. Thermostat constantly reads the temperature inside the refrigerator compartment and sends a signal to open or close the electrical circuit. If you hear a characteristic click before starting or stopping the engine, know that this is the mechanism that has worked.
Failure to operate this unit often leads to serious problems with food safety. In some cases, the chamber stops cooling, in others it turns into a block of ice. A critical sign of a malfunctioning thermostat is the continuous operation of the compressor without shutdowns or the complete failure of the unit to turn on when there is voltage in the network. Analysis of the physical processes occurring inside the sensor will help more accurately diagnose the problem and make a decision on repairs.
Design and physical basis of the sensor operation
A mechanical thermostat is a sealed system filled with a gas or liquid sensitive to temperature changes. The main working element is a bellows tube, which responds to thermal expansion and contraction of the working substance. As the temperature in the chamber rises, the gas inside the tube expands, creating pressure on the membrane. This mechanical force is transmitted to the contact group, closing the compressor power circuit.
The cooling process starts and the temperature begins to drop. As soon as it reaches the lower set limit, the working substance is compressed, the pressure drops, and the spring opens the contacts. Temperature differential is the difference between the on and off points, which is built into the design by the manufacturer. In refrigerators Stinol this parameter is usually several degrees, which allows the compressor to rest and save resources.
⚠️ Attention: The bellows tube of the thermostat is very thin and sensitive. When installing or dismantling, it is strictly forbidden to bend it at an acute angle or apply excessive force, as this will lead to depressurization and failure of the unit.
It is important to note that the sensitive element must be in direct contact with the evaporator or a special heat-conducting plate. In some models Stinol the tube is inserted into a separate socket inside the chamber. Thermal conductivity this connection directly affects the accuracy of the readings. If the tube dangles in the air or does not adhere well to the wall, the compressor operating cycle will be disrupted, which will lead to incorrect cooling.
Why does the gas not evaporate?
The working substance is sealed inside the copper tube and bellows. Even if the outer insulation of the cable is damaged, the system remains sealed as long as the metal tube itself is intact. Gas leakage occurs only during mechanical breakdown or metal corrosion.
Types of thermostats used in Stinol refrigerators
In different series of refrigeration equipment Stinol there may be different modifications of thermostats, although the principle of their operation remains similar. The most common are single-contact models that break the circuit when a low temperature is reached. However, there are also two-pin options, where the second contact is used to turn on a warning lamp or fan. Knowing the type of device you have is important when selecting replacement parts.
One of the key characteristics is the temperature range of operation. For the refrigerator compartment it is usually from -12 to +5 degrees Celsius, while for the freezer compartment the parameters may differ. Marking on the body of the device helps to identify its type. For example, popular models TAM-118 or TAM-133 are often found in appliances of this brand and have their own design features along the length of the capillary tube.
The length of the capillary tube also varies depending on the model of the refrigerator. It can range from 0.6 to 2.5 meters. If, when replacing, you install a thermostat with a shorter tube, it will have to be rolled into a ring inside the chamber, which is acceptable, but requires caution. A tube that is too long can be carefully laid, avoiding creases. Thermoregulator must meet the original specifications for correct operation of the system.
- 🔧 Single-contact - open the circuit when the temperature drops, most common in simple models.
- ❄️ Double-contact —have an additional output for controlling auxiliary elements of the system.
- 📏 Different capillary lengths —affects the installation method and immersion depth of the sensitive element.
Symptoms of thermostat malfunction
Diagnostics begins with observing the behavior of the refrigerator. If the compressor runs continuously without turning off for hours, and the temperature in the chamber drops below zero, the food freezes - this is a clear sign that the thermostat contacts are “stuck” in the closed state. The mechanism simply does not open the circuit, since it does not receive a signal that the required cold has been reached. In this case, urgent intervention is required to avoid overheating of the motor.
The opposite situation, when the refrigerator does not turn on at all, may also indicate a problem with the sensor. If, when turning the regulator to the “maximum” position and lightly tapping the body, there is no click and the motor does not start, it means that the circuit is not closing. Contact group could have oxidized or burned out. It is also worth checking whether the capillary tube has moved away from the evaporator, which is why the sensor “thinks” that the chamber is already cold.
Sometimes unstable operation is observed when the on and off cycles become too short or, conversely, excessively long. This may indicate a partial loss of bellows tightness or a leakage of working gas. In this case thermostat loses sensitivity and does not work correctly. Also, a malfunction may be indicated by the absence of a characteristic click when turning the adjustment knob.
Diagnostics and performance testing
Before buying a new part, you need to make sure it is faulty. The initial check is carried out by visual inspection and listening. When you turn the adjustment knob, you should hear a clear click. If it is not there, you can try to gently tap the thermostat body to loosen the stuck contacts. However, this is a temporary measure, and the part will still require replacement.
More accurate diagnostics can be carried out using a multimeter. To do this, you need to turn off the power to the refrigerator, gain access to the thermostat and remove the terminals from it. Having switched the device to the dialing mode, we check the presence of contact between the terminals. At room temperature the contacts should be closed. If the multimeter is silent, it means the circuit is broken inside the sensor.
For a complete test, you can place the sensitive tube in a container with water and ice (temperature about 0 degrees). Under such conditions the contacts should open. If this does not happen, it means that thermosensitive element lost its properties. It is also important to check the integrity of the tube itself for mechanical damage and corrosion.
☑️ Checking the thermostat
Instructions for replacing the thermostat
Replacing the thermostat in the refrigerator Stinol is a procedure that can be done with your own hands if you have basic tools. First you need to completely defrost the unit and disconnect it from the power supply. Next, remove the plastic overlay panel inside the refrigerator compartment or remove the top cover, depending on the model, to gain access to the sensor mounting location.
Carefully remove the old thermostat, having first memorized or photographed the wiring diagram. Disconnect the terminals and release the capillary tube from its seat. The new sensor is installed in the reverse order. Pay special attention to fixing the tube: it should fit snugly to the evaporator or fit into the standard hole until it stops.
| Work stage | Required actions | Important nuances |
|---|---|---|
| Preparation | Defrosting, disconnecting from the network | Draining the water from the pan |
| Dismantling | Removing the panel, disconnecting the terminals | Take a photo of the circuit |
| Installation | Installation of a new sensor | Do not bend the tube too much |
| Setting | Temperature adjustment | Checking operating cycles |
After installing all components, reassemble the structure in reverse order. Turn on the refrigerator and set the control knob to the middle position. During the first hours of operation, it is recommended to monitor the temperature using an external thermometer. If the on/off cycles are normal, and the food does not freeze or spoil, the replacement was successful.
⚠️ Attention: The characteristics of thermostats may vary slightly depending on the year of manufacture of the refrigerator. Before purchasing a spare part, check the markings on the body of the old sensor with the catalog number of the new one to avoid compatibility problems.
Setting the temperature mode after replacement
After installing a new thermostat, its initial setting is required. The factory settings may not be ideal for your kitchen operating conditions. The control knob usually has a gradation from 1 to 5 or 7. You should start adjusting from the middle value, for example 3 or 4. This will allow the system to reach operating mode without extreme loads.
During the first 24 hours, do not completely load the chamber with products. Allow the refrigerator to reach temperature while empty. If you notice that an excessive “fur coat” is forming on the back wall, and the compressor is running for a long time, try reducing the value on the regulator. If the temperature in the chamber is too high, add one division.
Correct calibration ensures energy efficiency and food safety. You should not immediately set the maximum cold, as this will force the compressor to work at its limit. The optimal operating mode is when the refrigerator turns off for about 10-15 minutes after 20-30 minutes of operation, although these figures may vary depending on the ambient temperature in the room.
The influence of the season on the settings
In the summer, when the room is hot, the thermostat may work differently, than in winter. In some cases, it may be necessary to adjust the position of the handle or check the operation of the defrost system if the refrigerator is installed in an unheated room.
Frequently asked questions (FAQ)
Is it possible to replace the thermostat with an analogue of another brand?
Yes, it is possible if the installation dimensions and capillary length are the same tubes and temperature response range. However, it is better to look for original spare parts Stinol or proven analogues, such as Tam or K-59specifically designed for refrigeration equipment.
Why does the refrigerator freeze less slowly after replacing the thermostat?
Probably the capillary tube of the new sensor is not deeply immersed in the evaporator socket or does not fit well into it. It is also possible that the temperature range of the new thermostat differs from the standard one, and time is required for adaptation or re-adjustment.
How often do you need to change the thermostat in a Stinol refrigerator?
The service life of a mechanical thermostat is usually 5-7 years of active use. However, under favorable conditions (stable voltage, no temperature fluctuations), it can last 10 years or more. Replacement is required only when signs of malfunction appear.
Is it dangerous to change the thermostat yourself?
The replacement process is electrically safe if the refrigerator is unplugged. The main danger is mechanical damage to the capillary tube or other elements of the system. If you carefully follow the instructions, the risk is minimal.