Owners of a reliable Belarusian equipment is often faced with the need to adjust the temperature regime, especially when it comes to models released 10–15 years ago. Despite its age, mechanical regulators require fine tuning or even replacement over time. Understanding the principle of operation of the thermostat is the key to stable cold in your chamber. Old Atlant refrigerator, despite its age, is able to keep food fresh, but mechanical regulators require fine tuning or even replacement over time. Understanding how your thermostat works is the key to keeping your room cool.
Unlike modern electronic panels, where you just need to press a button, in the classic models of the series MXM, MHM or KXH the control is carried out mechanically. This is a reliable system, but it is not without nuances that must be taken into account during operation. Critical
In this article we will look in detail at how to correctly set the necessary parameters, where the regulator is located in different modifications and what to do if the refrigerator has stopped freezing or, conversely, has begun to turn vegetables into ice. Proper tuning will extend the life of the compressor and preserve your supplies.
Location and types of temperature controllers
The first thing you need to start tuning with is finding the control element. Depending on the year of manufacture and the specific series of your Atlanta, the regulator may be located in different places. In most older single-compressor models, the thermostat is located inside the refrigerator compartment. Typically this is a plastic handle mounted on one of the side walls or on the ceiling of the chamber, often next to the lampshade.
If you have a two-chamber refrigerator with a No Frost system or a more advanced model with two compressors, you may find two separate regulators. One is responsible for the refrigerator compartment, the second for the freezer compartment. In some modifications, the freezer regulator may be hidden behind a decorative panel or located outside on the body, although this is less common for older models. It is important to accurately identify which regulator you are turning, so as not to upset the balance of the unit.
There are also models where the adjustment is made not by a rotary knob, but by a slider mechanism or buttons with a digital display, although for the “old” Atlanteans this is rather an exception. A mechanical thermostat, often labeled as TAM-133 or similar, works on the principle of opening a circuit when a certain temperature is reached. Understanding this mechanism helps you consciously approach the settings, and not act at random.
Instructions for setting up a mechanical thermostat
The process of adjusting the temperature in older models requires patience and consistency of actions. Don't expect instant results: the refrigerator takes time to stabilize after each change in settings. The algorithm of actions is simple, but requires attention to detail, especially if you are doing this for the first time.
Here are the main steps that must be followed to correctly set the temperature:
- 🌡️ Find the thermostat knob inside the chamber (usually it has a scale from 1 to 7 or from Min to Max).
- 🔌 Make sure that the refrigerator is connected to the network and is operating normally, and the compressor is not humming continuously.
- 🔄 Smoothly turn the knob in the desired direction: clockwise to increase the cold, counter-clockwise to weaken it.
- ⏳ Wait 3-5 hours before the next adjustment so that the temperature managed to level out.
If you are setting the temperature for the first time after a long period of inactivity or defrosting, it is recommended to set the knob to the middle position (usually number 3 or 4 on a seven-step scale). This will allow the system to reach operating mode without overloading the engine. After stabilizing the operation, you can make fine adjustments depending on your needs and the temperature in the room.
☑️ Checklist for setting the thermostat
Deciphering the thermostat scale
One of the most common reasons for the refrigerator to malfunction is a misunderstanding of the numbers on the regulator scale. Many users mistakenly believe that the number indicates degrees Celsius, but in mechanical thermostats Atlant the scale is conditional. It indicates the intensity of the compressor, and not a specific temperature.
The scale usually ranges from 1 to 7 (sometimes from 0 to 7). One means minimal cooling - the compressor will turn on rarely, maintaining a temperature of about +8..+10°C. Seven is the maximum cold, at which the engine runs almost non-stop, dropping the temperature to +2..+4°C and below. The zero position (0) or the inscription Off means the refrigeration chamber is completely turned off, the compressor will not work.
For normal storage of products in the refrigerator compartment, the handle position between 3 and 4 is considered optimal. This ensures a balance between food safety and energy consumption. In winter, when the apartment is cool, you can slightly reduce the power (set to 2 or 3), and in summer, when it’s hot, you can increase it (up to 4 or 5) to compensate for heat inflows.
⚠️ Attention: Setting the regulator to the maximum value (7 or Max) on a constant basis leads to accelerated wear of the compressor and freezing of the evaporator. Use this mode only for quick freezing of a large number of products, after which be sure to return the handle to the working position.
Optimal temperature conditions for different compartments
Correctly set temperature is the key to long-term storage of products and the absence of bacteria. For the refrigerator compartment, the ideal range is +2..+6°C. In such conditions, milk does not sour for a day, and meat and fish remain fresh. The freezer, in turn, should provide a temperature no higher than -18°C for long-term storage of supplies.
Below is a table that will help you navigate the settings depending on the time of year and the load of the refrigerator:
| Season / Conditions | Handle position | Expected temperature | Recommendation |
|---|---|---|---|
| Summer (heat > +25°C) | 4 – 5 | +3..+5°C | Monitor compressor operation |
| Off-season | 3 – 4 | +4..+6°C | Standard mode |
| Winter (the apartment is cool) | 2 – 3 | +5..+7°C | Saving engine life |
| Fast freezing | 6 – 7 (Max) | up to 0°C (in the refrigerator compartment) | No more than 6-8 hours |
It is worth considering that the temperature may vary on different shelves. It is always warmer on the top shelf than on the bottom, next to the vegetable drawers. Therefore, it is better to place perishable foods, such as meat or fish, closer to the back wall and on the lower levels, where it is colder.
Typical problems and methods for eliminating them
Even with proper settings, users of older Atlantov may encounter problems. There is often a situation when the refrigerator “does not hold” the temperature or, conversely, turns everything into ice. This may be due not only to the position of the handle, but also to the technical condition of the components.
Let's consider the main symptoms and their probable causes:
- ❄️ Products freeze on the shelves: Most likely, the thermostat is stuck in the maximum cold position or the tightness of the door seal is broken, which is why the compressor operates without stops.
- 🌡️ It is warm in the chamber, the products are spoiling: There may be a freon leak, a clogged capillary tube, or failure of the thermostat itself (it does not give a command to turn on the motor).
- 🔊 Frequent on/off: The temperature is set incorrectly (too close to the response threshold) or the automation is faulty.
If you suspect a thermostat malfunction, you can perform simple diagnostics. With the refrigerator unplugged, carefully remove the control knob and check whether it rotates freely. Sometimes the plastic stem breaks and turning the knob doesn't actually change the position of the internal mechanism. In such cases, replacement of the part is required.
How to check the thermostat with a multimeter?
To check, you will need to remove the thermostat and “ring” its contacts with a tester. At room temperature the circuit should be closed (resistance close to zero). If you put the sensor in the freezer for 10 minutes, the circuit should open. If this does not happen, the thermostat is faulty and requires replacement.
Influence of the external environment and chamber loading
Do not forget that the operation of an old refrigerator is highly dependent on external factors. Atlant, like any equipment of the previous generation, is sensitive to the temperature in the room. If the refrigerator is standing near a stove, radiator, or in direct sun, the cooling efficiency drops and the compressor is forced to wear out.
Proper loading of the chambers is also important. An empty refrigerator cools down faster, but it also “holds” the cold worse due to the small volume of heat-intensive products. A full chamber stabilizes the temperature, but requires initial cooling time. Do not place hot pots inside - this is a sharp jump in temperature that throws off the thermostat settings and forces the motor to work in emergency mode.
⚠️ Attention: Make sure that there is a gap of at least 10 cm between the back wall of the refrigerator and the wall of the room. Failure of condenser ventilation in older models leads to overheating and incorrect operation of the cooling system, regardless of the regulator settings.
When it is necessary to replace the thermostat
There are times when turning the knob is useless. If you move the regulator from minimum to maximum, and the compressor's operating pattern (hum, vibration, cycles) does not change, this is a sure sign of a thermostat failure. Also, a malfunction is indicated by the absence of a characteristic click when turning the knob to the off position.
Replacing the thermostat in Atlanta is a procedure accessible to the master, but requiring caution. The new sensor must have similar parameters (turn-on and turn-off temperatures). After installing a new part, you will definitely need to re-adjust the temperature using the algorithm described above, since the new mechanism may have a different calibration range.
Regularly checking the operation of your refrigerator will avoid food spoilage and expensive compressor repairs. Old models Atlant are famous for their maintainability, and timely replacement of a small part, such as a thermostat, can extend the life of the unit for many more years.
Why does ice form on the back wall of the refrigerator compartment?
The formation of a “fur coat” or ice crust on the back wall in old Atlant models is often the norm for a drip defrosting system. However, if the layer of ice becomes too thick, this may indicate that the thermostat does not turn off the compressor in time (the mode is too cold) or the door seal is broken, and moist air enters.
Is it possible to use the old Atlant in an unheated country house in winter?
Use the refrigerator at temperatures below +10°C (and then more than below 0°C) is not recommended. The oil in the compressor thickens, which leads to failure when starting. In addition, the refrigerant may not circulate correctly. If this is necessary, the refrigerator should be in a warm room.
What does the blinking indicator mean (if it is on older models)?
In old mechanical Atlant models there are usually no indicators. If you have a model with electronics, blinking most often indicates that the temperature in the chamber is above normal. Check that the door is tightly closed and that the refrigerator is not loaded with warm food.