Understanding exactly how your household unit functions is the first step to its proper operation and timely diagnosis of faults. Refrigerators Atlant with one compressor are a classic engineering system, where one power unit circulates refrigerant in two chambers at once. This solution allows you to significantly save energy and reduce noise levels compared to two-compressor analogues.
The operation is based on a closed cycle of gas compression and expansion, which takes heat from the internal volume and releases it to the environment. Single-compressor circuit requires a more complex freon flow control system in order to independently regulate the temperature in freezer and refrigerator compartments. It is this feature that often raises questions among users trying to understand the causes of icing or insufficient cold.
When understanding the design, it is important to consider that any interventions in the internal system require qualifications. In single-compressor Atlant models, the tightness of the defrost circuit is critically important, since damage to it leads to moisture entering the system and failure of the compressor. Next we will consider in detail each component of this complex machine.
The principle of operation of the refrigeration circuit
The heart of the entire system is compressorwhich creates the pressure necessary for movement refrigerant. Unlike two-compressor models, here one motor pumps freon through two evaporators in series or in parallel, depending on the specific modification and operating mode. The gas leaving the compressor has a high temperature and pressure, after which it is sent to the condenser.
In the condenser located on the rear wall, the hot gas cools and turns into liquid, giving off heat to the room. The refrigerant then passes through a filter drier, where any remaining moisture is removed from it, and enters the capillary tube. It is in this unit that a sharp drop in pressure occurs, which leads to the boiling of freon and the beginning of the active cooling process.
Why is the condenser hot?
The normal operating temperature of the condenser gratings can reach 50-60 degrees. This is not a malfunction, but a sign that the system is effectively removing heat taken from the refrigerator chambers. If the grate is cold while the compressor is running, this is a sign of a leak or capillary.
The refrigerant cooled to low temperatures enters the evaporator of the freezer, where it boils and intensively absorbs heat. After passing through the freezer, the remaining liquid freon can boil in the evaporator of the refrigerator compartment, ensuring that the temperature remains above zero. It is important to understand that refrigerant circulation is continuous as long as the compressor receives an electrical signal to operate.
⚠️ Attention: When trying to replace the compressor yourself or soldering tubes, you must use nitrogen to purge the system. The entry of air or moisture into the circuit will lead to the formation of ice plugs and acids in the oil, which will irreversibly damage the new motor.
No Frost and defrost system in single-compressor models
Many modern models Atlant equipped with a system No Frostthat prevents the formation ice on the food. In a single-compressor scheme, the implementation of this system has its own characteristics, since one compressor must serve both the deep-freeze zone and the storage zone. For this, a special solenoid valve is used that redirects the freon flows.
The evaporator defrost process starts automatically using a timer. At this moment, the compressor can continue to operate, but the hot gas is sent to the evaporator to melt the ice, or a special one is turned on. The water flows into a special tray and evaporates naturally. This process is controlled by an electronic module or a mechanical timer. Defrost heating element. The water flows into a special tray and evaporates naturally. This process is controlled by an electronic module or mechanical timer.
- ❄️ The evaporator is hidden behind the back panel in the freezer and does not come into direct contact with the products.
- ⏱️ The defrost timer cyclically switches between cooling and defrosting modes, usually 4-6 times a day.
- 💨 The fan forcibly circulates cold air through both chambers through air ducts.
If the defrosting system malfunctions, ice can block the air ducts and cold will stop flowing into the refrigerator compartment, although the temperature in the freezer will remain the same. A common cause is burnout of the heating element or sticking of the defrost sensor. Checking these elements requires testing them with a multimeter and partially disassembling the inner lining.
The role of the solenoid valve and thermoregulation
The key element that distinguishes a single-compressor Atlant from simpler models is solenoid valve. It is installed at the outlet of the condenser and separates the refrigerant flows. When cooling is required in only one chamber or a defrost mode needs to be started, the valve closes one branch of the circuit and opens another.
Thermoregulation is carried out using temperature sensors located at different points in the chambers. Signals from them are sent to the control board, which decides whether to turn on the compressor or switch the valve. In older models, this function is performed by a mechanical thermostatwhich opens the electrical circuit when the set temperature is reached.
| Component | Function | Typical malfunction |
|---|---|---|
| Solenoid valve | Switching cooling circuits | Stuck in one position |
| Thermostat / Sensor | Temperature control in the chamber | Incorrect readings, open circuit |
| Defrost timer | Cyclic switching of modes | Stopping the timer, burnt contacts |
| Fan | Air circulation (No Frost) | Wear of bearings, freezing |
Valve malfunction is often manifested by the fact that one of the chambers stops freezing, while the other operates in increased mode. Diagnostics of this unit requires checking the voltage on the valve winding at the moment when the mode change should occur. If there is voltage but there is no click, the valve must be replaced.
Electrical circuit and start-protective equipment
Reliable operation of the compressor is impossible without the correct start-protective equipment. Refrigerators Atlant use a combination of starting and protective relays. The starting relay supplies a short-term pulse to the starting winding of the engine, helping it gain speed, after which it turns off. The protective relay opens the circuit in case of overcurrent or overheating.
Modern models are often equipped with inverter compressors, where control is carried out by an electronic board. In such systems, soft starting eliminates the need for a mechanical start relay. However, classic single-phase motors are still widespread and require periodic checking of relay contacts, which can burn out over time.
The electrical circuit also includes a lighting circuit, a door open sensor and, in models with a display, a control panel. All these elements are powered from a common 220V network, but pass through various converters or directly, depending on the consumer. Loss of contact in the connectors can simulate the breakdown of more complex components.
⚠️ Attention: Before any check of electrical components, be sure to disconnect the refrigerator from the network. Even after switching off, a residual charge may remain in the control board capacitors, which can cause an electric shock.
Diagnostics of main faults
Knowledge of the device allows you to quickly identify the cause of the breakdown. If the refrigerator Atlant stops freezing, but the compressor runs constantly, the problem may be a freon leak or a clogged capillary system. In this case, the pressure in the circuit drops, and the refrigerant does not have time to create the necessary cooling capacity.
If extraneous noise appears, you should pay attention to the No Frost system fans or compressor mounts. Vibration can be transmitted to pipelines if they touch the housing. Also, the source of the sound may be a faulty fan bearing that requires lubrication or replacement.
- 🔊 Loud hum and vibration - check the level installation and fastening of the motor.
- 💧 A puddle of water inside or outside - check the drainage hole and defrost tray.
- 🌡️ The compressor does not turn on - check the thermostat, the start relay or the presence of voltage in the network.
It is important to distinguish between the symptoms when the refrigerator does not gain temperature and when it freezes too much. In the first case, a leak or compressor is most often to blame; in the second, a stuck thermostat or a faulty sensor. Accurate diagnostics saves time and money, allowing you to replace only the defective part.
☑️ Primary diagnostics of the refrigerator
Features of maintenance and care of the system
To extend the service life of a single-compressor unit, it is necessary to regularly clean the condenser dust grill. A heat exchanger clogged with dust impairs heat transfer, causing the compressor to work longer and with greater load. This is a direct path to overheating and premature wear.
You should also monitor the condition of the door seals. If they do not fit tightly, warm, moist air enters the chamber, which leads to increased ice formation on the evaporator. The defrosting system may not be able to cope with a large volume of ice, which will lead to freezing of the channels and breakdown of the fan.
It is not recommended to load warm products into the chambers. This creates sudden temperature changes and increases humidity, which increases the load on the defrost system. Compliance with simple operating rules allows the system No Frost to operate in optimal mode, minimizing the risk of icing.
Frequently asked questions (FAQ)
Why does the upper chamber not freeze in a single-compressor Atlant refrigerator?
More often The whole reason lies in a malfunction of the solenoid valve, which does not switch the flow of freon, or in the freezing of the air channel between the chambers. It is also possible that the upper chamber temperature sensor may fail.
Is it possible to replace a single-compressor circuit with a two-compressor one?
Theoretically it is possible, but technically it is extremely difficult and economically impractical. It will be necessary to overhaul the entire circuit, change the thermal insulation, install a new control board and install a second compressor. It’s easier to buy a new refrigerator.
How often do you need to defrost a refrigerator with No Frost?
The No Frost system does not require manual defrosting to remove ice. However, it is recommended to turn off the refrigerator once a year to completely defrost, wash and dry it to remove bacteria and check drainage.
What does the flashing temperature indicator on the Atlant panel mean?
Flashing usually indicates that the temperature in the chamber has risen above the permissible limit. This may be a consequence of loading warm products, a door that is not tightly closed, or a technical malfunction of the cooling system.