The operation of household appliances produced several decades ago requires special attention and understanding from the owner of the principles of its operation. Old models of refrigerators Atlant are famous for their reliability, but over time the mechanical components wear out and the settings get lost. If you notice that the chamber has become too cold or, conversely, food has begun to deteriorate faster, then it’s time to intervene in the operation of the thermoregulation system. Unlike modern electronic units, everything here is solved by mechanics, which often allows you to carry out repairs yourself without calling a technician.
Temperature adjustment in units of the Soviet and post-Soviet period is a process that requires accuracy and precision. Thermoregulatorinstalled in such models is a sensitive device that responds to pressure changes freon in the capillary tube. Incorrect settings can lead to the compressor working non-stop, which can lead to overheating of the motor and increased energy consumption. On the other hand, setting the temperature too high will cause the unit to turn on rarely, which is unacceptable for the preservation of food in the hot season.
Before picking up tools, it is necessary to conduct a thorough diagnosis of the current state of the device. Often the problem lies not in lost settings, but in a banal loss of tightness of the seals or contamination of the condenser. In this article, we will analyze in detail the algorithm for identifying faults and describe step by step how to correctly adjust temperature conditions in your old refrigerator Atlantto extend its service life.
Diagnosing temperature problems in older models
The first step before any adjustment should be to understand what exactly is happening inside the chambers. If you are planning to adjust your refrigerator but don't know the exact cause of the problem, you could be wasting your time. In older models Atlant, such as the MXM-1700 or 1800 series, a situation often occurs when the evaporator becomes overgrown with a “fur coat”, and the products in the main chamber remain warm. This indicates a violation of the defrost cycle or incorrect operation of the thermostat.
Pay attention to the operating mode of the compressor. Normally, an old refrigerator should work cyclically: turn on, cool the chamber to a predetermined limit, and turn off to rest. If the motor hums continuously without turning off for hours, this is a signal that the system “thinks” that the temperature is not low enough. Thermoregulator at this moment it may be faulty or its settings are set in the direction of maximum cold. It is also worth checking whether the regulator knob is sticking to the body due to ice.
For accurate diagnosis, you will need an external thermometer that can be placed inside the chamber. This will allow you to obtain objective data, rather than relying on subjective sensations of “cold” or “warm”. Place the thermometer in a glass of water on the middle shelf and leave for several hours. Only after this can you draw conclusions about the need to intervene in the settings.
⚠️ Attention: If the compressor runs around the clock without stopping, and the temperature in the chamber does not drop below +10°C, the problem may not be in the settings, but in a freon leak or a malfunction of the motor itself. Adjusting the thermostat will not help in this case.
Location and design of the Atlant thermostat
In order to properly adjust an old refrigerator, you need to clearly understand where the control is located. In most older models, the temperature regulator is located inside the refrigerator compartment. Usually this is a plastic handle with digital divisions, mounted on the end or side wall. In some modifications, access to it may be difficult due to shelves or drawers that will have to be temporarily dismantled. Atlant The old-style temperature controller is located inside the refrigerator compartment. Usually this is a plastic handle with digital divisions, mounted on the end or side wall. In some modifications, access to it may be difficult due to shelves or drawers that will have to be temporarily dismantled.
Under the plastic handle there is a rod connected to the internal mechanism thermostat. It is the rotation of this rod that changes the force of the spring, which presses on the sensor membrane. When the gas pressure in the capillary tube (which surrounds the evaporator) reaches a certain value, the membrane opens the contacts and the compressor turns off. Understanding this mechanics helps you understand why sharp turns of the knob can lead to incorrect operation.
It is important to know that in two-chamber models Atlant with one compressor, the thermostat controls the temperature only in the refrigerator compartment. The freezer compartment is cooled according to the residual principle. Therefore, by adjusting the handle, you primarily influence the upper chamber, and the freezer reacts to these changes with a delay and less amplitude.
Capillary tube design
The capillary tube of the thermostat is a thin copper conductor filled with an inert gas. One end of it is sealed into the thermostat bellows, and the other is pressed tightly to the surface of the evaporator. When the temperature changes, the gas expands or contracts, transferring pressure to the mechanical part of the relay. Damage to this tube (a crease or breakdown) makes adjustment impossible and requires replacement of the entire assembly.
Step-by-step instructions: how to set up a thermostat
The setup process does not require a complex tool, but requires a sequence of actions. First you need to find the correct starting position. The regulator knob usually has numbers from 1 to 5, 6 or 7, or a “Min-Max” scale. The number 1 corresponds to the highest temperature (minimum cooling), and the maximum number corresponds to the most severe frost. To begin, set the knob to the middle position, for example, to the number 3 or 4.
After setting the knob to the middle position, let the refrigerator Atlant work in this mode for at least 5-6 hours. During this time, the system will reach a stationary mode, and it will be possible to evaluate the result. If food in the refrigerator compartment freezes at the back wall, it means there is too much power. If the milk quickly sours or there is no condensation on the walls, there is not enough power.
Make adjustments in small steps. Turn the knob no more than one notch at a time. A sudden move from "3" to "7" can cause the compressor to go into continuous operation and not be able to turn off until you intervene again. After each change, wait a few hours to stabilize the temperature background.
☑️ Algorithm for setting the thermostat
There is a common misconception that the position of the regulator directly sets degrees Celsius. In fact, you only set the compressor shutdown threshold. The actual temperature will depend on many factors: ambient temperature (temperature in the room), loading of the chambers with products and the condition of the seals. Therefore, “number 5” in winter and summer may give different actual results.
Table of correspondence of modes and symptoms
For ease of diagnosis and configuration, you can use a summary table that relates the position of the regulator, operating symptoms and necessary actions. This will help you find your way faster if the standard setting at the “average” value does not give the expected result.
| Regulator position | Operation symptoms | Probable cause | Recommended action |
|---|---|---|---|
| Minimum (1-2) | The compressor rarely turns on, the chamber is warm (+10...+12°C) | Weak cooling, summer, empty chamber | Add power (turn clockwise) |
| Average (3-4) | Cyclic operation, normal cooling (+4...+6°C) | Normal operating mode | Leave unchanged |
| Maximum (6-7) | The compressor does not turn off, ice is freezing | Heat, full load, seal wear | Reduce power or check the seal |
| Any position | The motor hums, but there is no cold | Compressor malfunction or leakage | Call a technician, adjustment is not possible will help |
Replacing and adjusting the temperature sensor
In some cases, mechanical adjustment of the knob does not bring results due to failure of the knob itself. thermostat. Old models Atlant often were equipped with domestic relays (for example, TAM-112 or TAM-133), which over time lose sensitivity or stick. If you turn the knob, the shutdown click is not heard, but the motor continues to work - most likely, the sensor requires replacement.
The replacement process requires caution. The capillary tube that is attached to the evaporator is very thin and easily damaged. When installing a new sensor, it is necessary to ensure tight contact of the sensitive area of the tube with the surface of the evaporator. Usually it is fixed with a special clamping bar. If the tube dangles in the air, the refrigerator will not work correctly, constantly turning on and off.
After replacement, additional adjustments may be required. New sensors may have slightly different response characteristics. In this case, the same method of gradually adjusting the position of the handle described above is used. It is important to check the tightness of the tube insertion into the chamber body so that cold air does not escape out through the hole.
⚠️ Attention: Before replacing the thermostat, be sure to disconnect the refrigerator from the power supply! Working with live electrical wiring and internal components is deadly.
Seasonal features of operation and settings
Old refrigerators Atlant are very sensitive to ambient temperature. In winter, when the apartment is cool (about +18...+20°C), the unit can operate in economical mode even at medium settings. In the summer, when the air is heated to +28...+30°C, the heat exchange of the condenser worsens, and the compressor takes more time to reach the set temperature.
In the summer, it is recommended to shift the regulator by 1 notch towards increasing cold (clockwise) if you see that the food is beginning to thaw. However, you should not set the maximum value unless there is an urgent need for it. Working to the limit accelerates the wear of the compressor piston group.
In winter, on the contrary, you can reduce the power a little. This will allow the compressor to take longer breaks, which will have a beneficial effect on its service life. If the refrigerator is placed on an unheated balcony or garage, its operation may become unstable. The oils in the compressor thicken, and the thermostat may not “understand” that you need to turn on the motor, since it’s already cold in the chamber.
Common mistakes when doing it yourself adjustment
When trying to adjust an old refrigerator, owners often make mistakes that nullify all efforts. The most common of them is the expectation of instant results. The thermostat is an inertial system. After turning the knob, a considerable amount of time must pass before the internal temperature stabilizes. Checking “by touch” 15 minutes after adjustment does not make sense.
Another mistake is ignoring the condition of the sealing rubber. If the door does not fit tightly, warm air constantly enters. You turn the regulator to maximum, trying to compensate for heat loss, the compressor wears out, but does not get colder. In such cases, you first need to restore the tightness of the circuit, and only then adjust the temperature.
Also, do not forget about loading the chambers. An empty refrigerator and a completely stocked refrigerator require different settings. The products act as a cold accumulator. If you just loaded up a bag of fresh produce from the store, the temperature inside will rise sharply and the compressor will run longer than usual. This is normal and does not require intervention in the settings.
Why does the Atlant refrigerator get very cold even at minimum?
If ice forms in the chamber even at the “1” or “Min” mark, and the compressor does not turn off, this may indicate two problems. The first is that the contacts inside the thermostat itself are stuck, and it physically cannot break the circuit. The second is that the capillary tube has moved away from the evaporator and does not feel a real decrease in temperature. In both cases, the thermostat needs to be replaced.
Is it possible to completely turn off the thermostat and control the refrigerator manually?
Theoretically, you can close the contacts so that the compressor works constantly, but this is strictly not recommended for domestic use. Without automatic shutdown, the evaporator will become covered with ice, the food in the refrigerator compartment will freeze, and the compressor will burn out from overheating or water hammer with liquid freon. Manual control is only possible in emergency modes for a short time.
How to understand that the thermostat is working, but is configured incorrectly?
If the thermostat is working, you will always hear a characteristic click when turning the knob through the entire range (from minimum to maximum and back). If there is a click, the compressor reacts to it (turns on or off), then the mechanism is intact. The only problem is that the selected response point does not correspond to your current needs or external conditions.
Does the network voltage affect the operation of the thermostat in the old Atlanta?
The mechanical thermostat itself does not depend on the network voltage, since it responds only to temperature. However, low voltage may cause the compressor to fail to start or to overheat, creating the illusion that the control system is faulty. If the light bulbs in the house are dim, the problem may lie in the electrical network, and not in the refrigerator settings.