Refrigerators Atlant are one of the most popular in Russia and the CIS countries due to the combination of reliability, simplicity of design and affordable price. But how exactly do they maintain a low temperature inside, why does the compressor periodically turn on and off, and what happens to the freon in the system? If you have ever thought about these questions, this article is for you.
We will analyze the operating principle of the Atlant refrigerator at the level of physical processes, show how the refrigerant circulates through the circuit, and explain what each key unit is responsible for - from the compressor to the evaporator. For clarity, we will cite a unique diagram indicating all the parts specifically for the Atlant models (MXM, NM, XM series), and also select current videos with analysis of the device. If you are planning a repair or just want to understand how to care for your appliances correctly, read on.
The main components of the Atlant refrigerator: what's inside and why
Any refrigerator Atlant (be it a single-chamber model MHM 170 or a two-chamber XM 4026) consists of several key blocks connected into a single system. Their task is to remove heat from the internal space and maintain a given temperature. Here are the main components:
- 🔧 Compressor —the “heart” of the refrigerator, which compresses the refrigerant (freon) and ensures its movement through the tubes.
- ❄️ Evaporator —a metal radiator inside the chamber where freon boils, absorbing heat.
- 🔥 Condenser —a grill on the back wall where the refrigerant cools and turns into a liquid state.
- 🌀 Capillary tube - a narrow channel that regulates the freon pressure in front of the evaporator.
- 📏 Thermostat - a sensor that monitors the temperature and controls the on/off of the compressor.
Unlike inverter models (for example, LG or Samsung), refrigerators Atlant use linear compressorwhich operates in the “on/off” mode. This simplifies the design, but requires more frequent maintenance (for example, changing the oil every 5-7 years).
It is important to understand that all these nodes are connected by a sealed system of tubes through which the refrigerant circulates (usually R600a or R134a in new models). If a leak or blockage occurs somewhere, the refrigerator stops freezing. We will talk about this in more detail in the section on malfunctions.
The principle of operation of the Atlant refrigerator: step-by-step diagram
The operation of the refrigerator is based on Carnot cycle a physical process in which heat is transferred from one place to another due to a change in the state of aggregation of the refrigerant. In the case of Atlant this cycle looks like this:
- Freon compression. The compressor sucks gaseous refrigerant from the evaporator and compresses it to high pressure (5–10 atm), heating it to 70–90°C.
- Condensation. Hot freon enters the condenser (grid on the back wall), where it is cooled by the room air and turns into liquid.
- Throttling. Liquid freon passes through capillary tube (or a thermostatic valve in new models), where its pressure drops sharply.
- Evaporation. The refrigerant enters the evaporator (freezer) where it boils, absorbing heat from the chamber. The temperature inside drops.
After this, the cycle repeats. The entire process takes 10–20 minutes depending on the set temperature and external conditions. For example, if the room is hot (above 30°C), the compressor will have to work longer to cool the freon to the desired temperature.
Why does the compressor not work constantly?
The compressor turns on only when the temperature in the chamber rises above the set value (usually +4...+6°C for the refrigerator compartment and −18°C for freezer). As soon as the sensor detects a normal temperature, the thermostat opens the circuit and the compressor turns off. This saves energy and reduces wear of parts.
| Unit | Refrigerant temperature | Pressure | Aggregation state |
|---|---|---|---|
| Compressor inlet | +5...+10°C | 1–2 atm | Gas |
| Compressor output | +70...+90°C | 8–10 atm | Gas (superheated) |
| Condenser | +30...+50°C | 7–9 atm | Liquid |
| Capillary tube | +10...+20°C | 1–2 atm | Liquid + steam |
| Evaporator | −10...−25°C | 0.5–1 atm | Gas (boiling) |
In practice, this cycle can be observed by the following signs:
- 🔊 The compressor is humming and vibrates during operation (normal if the sound is smooth, without grinding).
- 🌡️ The condenser on the back wall heats up (in some models up to 60°C - do not touch with bare hands!).
- ❄️ The evaporator in the freezer becomes covered with frost (in models with a drip system defrosting).
Video: how the Atlant refrigerator works from the inside
To better understand the process, we recommend watching the following videos (relevant for models 2020–2026):
- 📹 Disassembling the refrigerator "Atlant" MHM 1808 —the compressor, condenser and evaporator are shown with explanations:
YouTube: "How the Atlant refrigerator works - disassembly and principle of operation" - 📹 Freon operating cycle — animation explaining the physical processes:
YouTube: "Refrigeration cycle for dummies - how the refrigerator freezes" - 📹 Fault diagnosis - how to check the compressor and thermostat:
YouTube: "Atlant does not freeze - we are looking for the reason in 10 minutes"
Please note: the video often shows single-chamber models (for example, MHM 170), but the principle of operation of two-chamber (series HM or NM) is similar. The only difference is the presence of a second evaporator and an additional fan for uniform distribution of cold.
Frequent faults and how to recognize them
Even reliable refrigerators Atlant can break down over time. Here are typical signs of malfunctions and their possible causes:
| Symptom | Probable cause | What to do |
|---|---|---|
| The compressor runs non-stop | Freon leak, capillary tube clogged, thermostat malfunction | Check the pressure in the system, replace the thermostat |
| The refrigerator does not freeze, but the light is on | The compressor is burned out, the winding is broken, the starter is faulty relay | Ring the windings with a multimeter, replace the relay |
| Loud noise or knocking | Wear of the compressor suspension, foreign objects getting into the fan | Adjust the fastenings, clean the fan |
| The condenser on the back wall does not heat up | Clogged filter-drier, compressor malfunction | Clean the system or replace the compressor |
If the refrigerator Atlant stops freezing, first check:
Power (socket, plug, cable)|Thermostat (turn the knob to maximum - the contact should click)|Condenser (should be warm)|Compressor (should hum when turned on)-->
⚠️ Attention: If you suspect a freon leak (for example, oil on the floor under the refrigerator or lack of cold when the compressor is running), do not try to repair it yourself. Freon R600a is explosive if leaked in a closed space. Contact the service center.
How to extend the life of an Atlant refrigerator: operating tips
The service life of refrigerators Atlant is 10–15 years with proper care. To avoid breakdowns:
- 🧊 Defrosting. In models with a drip system (MHM 1808, XM 4026), defrost the chamber every 6 months. B No Frost (NM 4404) - once a year is enough.
- 🧹 Cleaning the condenser. Dust on the grill impairs heat transfer - wipe it with a soft brush every six months.
- 🔌 Stable power supply. Connect through a surge protector: power surges kill the compressor.
- 🚪 Closing the door tightly. Check the rubber seal - if it is cracked, the cold will escape.
⚠️ Attention: If your refrigerator Atlant was produced before 2015, it may use freon R12 or R22, which are prohibited from production. If there is a leak, such refrigerant cannot simply be refilled - the compressor will need to be replaced and the system converted to a modern one. R600a.
Atlant models with different cooling systems: what is the difference?
Refrigerators Atlant are divided into three types according to the cooling system:
- Drip (static) —cold spreads by natural convection. The evaporator is located on the rear wall, moisture flows into the tray. Examples: MHM 170, XM 4026-080.
- No Frost —the cold is distributed by a fan, frost does not form. Examples: NM 4404, XM 6025.
- Combined —drip refrigeration chamber, freezer— No Frost. Example: XM 4024-089.
Main differences:
| Parameter | Drip | No Frost |
|---|---|---|
| Energy consumption | Low | Higher by 10–15% |
| Noise level | 38–42 dB | 40–45 dB (due to the fan) |
| Maintenance | Manual defrosting 2 times a year | Automatic defrosting |
| Price | Lower by 15–20% | More expensive |
The choice of system depends on your priorities. If silence and energy savings are important to you, take the drip model. If you don’t want to bother with defrosting - No Frost.
FAQ: answers to frequently asked questions
Why does the Atlant refrigerator make a loud noise when turned on?
This is normal: when starting, the compressor overcomes inertia and creates high pressure in the system. The hum should subside within 1-2 minutes. If the noise does not go away or is accompanied by knocking, check the compressor mounts or call a technician (the shock absorbers may be worn out).
Is it possible to place the Atlant refrigerator on the balcony in winter?
No. At temperatures below +10°C, the oil in the compressor thickens and it may not start. In addition, the electronics (thermostat, control board) are not designed for frost. If there is no other choice, use a model with climate class SN-T (for example, Atlant MHM 1708-60), which operates down to −15°C.
How much freon is in the Atlant refrigerator?
The volume of refrigerant depends on the model:
- Single-chamber (MHM 170) - 40–60 grams
R600a. - Two-chamber (XM 4026) - 80–120 grams.
The exact quantity is indicated on the compressor nameplate (look for the inscription Refrigerant Charge).
How to check the thermostat in the Atlant refrigerator?
Unplug the refrigerator, remove the thermostat knob and find the two wires going to it. Connect them together (for example, with a paper clip). If the compressor starts, the thermostat is faulty and needs to be replaced. Attention: do not keep the wires closed. longer than 1–2 seconds!
What to do if the Atlant refrigerator does not turn off?
The reasons may be different:
- High temperature in the room (above 30°C).
- The door is not closed properly (check the seal).
- Freon leak or capillary tube clogged.
- Malfunction of the thermostat or control board.
First, defrost the refrigerator for 12 hours. If the problem persists, call a technician. diagnostics.