Two-chamber refrigerators Atlant with one compressor are one of the most popular models in the post-Soviet space. Their reliability and simplicity of design have been tested over decades of operation. But how exactly does this technique work? Why does one compressor successfully cool two chambers at once - a refrigerator and a freezer? And what nuances need to be taken into account when using?
In this article we will analyze in detail operating principle refrigerators Atlant with one compressor, we will explain how the cold is distributed between the chambers, and we will reveal the secrets of the durability of these units. You will learn which models (MHM 2835-080, MHM 1701-80 and others) use this scheme, and how to operate them correctly to avoid breakdowns.
Design of the Atlant refrigerator with one compressor: main components
The design of a two-chamber refrigerator Atlant with one compressor is built on the classic scheme with a single cooling circuit. This means that the refrigerant (usually R-134a or R-600a) circulates through a single system of tubes, sequentially cooling first the freezer and then the refrigerator. Main components:
- 🔧 Compressor —the “heart” of the system, which compresses the refrigerant and forces it to move along the circuit. Models Atlant usually use a piston compressor brand Danfoss or Secop.
- ❄️ Condenser —a grill on the back wall of the refrigerator where the hot refrigerant is cooled and condensed into liquid.
- 🌀 Filter drier —removes moisture from the refrigerant, preventing the formation of ice jams.
- 🔄 Capillary tube —a thin channel that creates a pressure difference in front of the evaporator.
- ❄️ Evaporator —located in the freezer (sometimes duplicated in the refrigerator). Here the refrigerant boils, absorbing heat.
- 📊 Thermostat - regulates the temperature by turning the compressor on/off. In Atlant a mechanical thermostat K-59 or electronic ATX-4.
A feature of single-compressor models is often used. First, the cold enters the freezer (where the temperature is maintained at sequential cooling of the chambers. First, the cold enters the freezer (where the temperature is maintained at -18...-24°C), and then into the refrigerator compartment (+2...+6°C). This is achieved due to:
- 🔗 Highways with valve —part of the refrigerant after the freezer is sent to the fridge compartment.
- 🌡️ Temperature sensors —separate sensors in each chamber transmit data thermostat.
- 🔄 Fan (in models with No Frost) - distributes cold evenly (for example, in Atlant MHM 2808-90).
Principle work: how one compressor cools two chambers
The operating cycle of a refrigerator Atlant with one compressor can be divided into 4 stages:
- Compression of the refrigerantThe compressor sucks gaseous freon from the evaporator, compresses it to. pressure
10–15 atmand pumps into the condenser. The temperature of the refrigerant rises to+70...+90°C. - CondensationThe condenser (grid on the rear wall) is hot. freon is cooled by the air in the room, turning into a liquid state. It is important here that there is enough space around the refrigerator for ventilation!
- Throttling. The liquid refrigerant passes through capillary tube (or a thermostatic valve in new models), where its pressure drops sharply and the temperature drops to
-20...-30°C. - Evaporation. The cooled freon enters the evaporator of the freezer, where it boils, absorbing heat, then goes to the evaporator of the refrigeration chamber (if there is one) or simply passes through its walls.
The key feature of single-compressor Atlant models is the use of a magnetic valve or distribution tube to separate the refrigerant flow between the chambers. This allows you to maintain different temperatures in the freezer and refrigerator, despite a single circuit.
The thermostat controls the process, including the compressor. increasing the temperature and turning it off when the set values are reached. In mechanical models (for example, Atlant MXM 1840-80), adjustment is carried out by a rotary knob, in electronic (Atlant MXM 2806-90) - by touch buttons.
Distribution of cold between chambers: why is the freezer colder
B in two-chamber refrigerators Atlant with one compressor, the freezer compartment is always cooled first. This is due to:
- 📉 Priority to low temperatures. The freezer requires
-18°Cand below, while the refrigerator compartment is sufficient+4°C. It makes more sense to provide a colder zone first. - 🔄 Sequential contour. The refrigerant first passes through the evaporator of the freezer, and then - if the “cold potential” remains - is sent to the fridge compartment.
- 🛠️ Evaporator design. In the freezer, the evaporator usually has a large area and direct contact with the products (in models without No Frost).
The temperature in the refrigeration chamber is regulated in two ways:
- By throttling the flow of refrigerant. Part of the freon after The freezer passes through an additional capillary or valve, reducing the cooling intensity.
- By cycling. compressor. The thermostat turns off the compressor when the refrigerator compartment reaches the desired temperature, even if the freezer has not yet completely cooled.
| Parameter | Freezer compartment | Refrigerator compartment |
|---|---|---|
| Temperature, °C | -18...-24 | +2...+6 |
| Evaporator type | Plate or tubular (No Frost) | Tubular (drip system) or absent |
| Cooling priority | High (first in the circuit) | Low (second in circuit) |
| Temperature control | Mechanical damper or electronic valve | Thermostat or separate sensor |
In models with No Frost (for example, Atlant MHM 2808-90) the cold is distributed using a fan, which circulates air through both chambers. This allows the temperature to be equalized faster, but requires more energy.
What is a “crying” evaporator?
In Atlant refrigerators with a drip defrosting system (for example, MHM 1701-80), an evaporator is located on the back wall of the refrigerator compartment. While the compressor is operating, frost forms on it, and during pauses drops of water flow into the drainage hole - that is why the system is called “crying.”
Advantages and disadvantages of a single-compressor system
Refrigerators Atlant with one compressor have their pros and cons compared to two-compressor models. Let's look at them in more detail.
Advantages
- ✅ Simplicity of design —fewer parts = lower probability of breakdown. The compressor and thermostat are the main components that can fail.
- ✅ Energy efficiency. One compressor consumes less electricity than two (on average
250–400 kWh/yearversus400–600 kWh/yeartwo-compressor models). - ✅ Lower price. Single-compressor refrigerators Atlant cheaper than analogues with two motors by
15–30%. - ✅ Compactness. The rear part takes up less space, since there is only one compressor and condenser.
Disadvantages
- ❌ Dependence of chambers. If the compressor fails, both chambers will stop working. In two-compressor models, one chamber can continue to function.
- ❌ Less precise adjustment. The temperature in the refrigerator compartment depends on the freezer mode. For example, if you turn on
Super freeze, the refrigerator compartment may become overcooled. - ❌ Temperature recovery takes longer.. After defrosting or loading a large amount of food, a single-compressor system requires more time to cool.
- ❌ Noise. One compressor works longer than two in turn, so it may seem louder (noise level
40–45 dBversus38–42 dBfor two compressors).
For most users, the pros outweigh the cons. Single-compressor refrigerators Atlant are optimal for families of 3-4 people, where ultra-precise temperature control is not required.
Typical faults and their causes
Despite their reliability, refrigerators Atlant with one compressor can break down. Most common issues are related to the cooling system or thermoregulation. Let's look at the main problems and their causes:
- ❄️🔥 One of the chambers does not freeze:
- 🛠️ Clogged capillary tube (refrigerant stops circulating).
- 🔧 Breakage of the magnetic valve (refrigerant does not enter the refrigerator compartment).
- 🌡️ Malfunction of the thermostat or temperature sensor.
- ⚡ The compressor runs without stopping:
- 🧊 Refrigerant leak (insufficient pressure in the system).
- 🔥 Condenser contamination (poor heat exchange).
- 📉 Incorrect thermostat setting (temperature too low).
- 💧 Water in the refrigerator compartment:
- 🚫 Clogged drainage hole (in models with drip system).
- 🔄 Malfunction of the evaporator heater (in No Frost).
- 🧊 Defrosting due to frequent opening of the door.
- 🔊 Strong noise or vibration:
- 🔧 Loose fasteners compressor.
- 🛠️ Wear of shock absorbers.
- 🧲 Foreign objects entering the fan (in No Frost).
Most breakdowns are associated with heat transfer disturbance or refrigerant leak. For example, if the refrigerator Atlant stops freezing, but the compressor is humming, most likely the system has become depressurized or the capillary is clogged.
Check if the light inside is on (there is power)|
Make sure the thermostat is not set to minimum cooling|
Inspect the condenser for dust or damage|
Listen to the compressor: it should turn off periodically|
Check the door seals for leaks -->
⚠️ Attention: If a refrigerator Atlant with one compressor stops cooling both chambers at the same time, do not try to repair it yourself. In 90% of cases, this is due to a freon leak or a compressor breakdown - a specialist with equipment for refilling the refrigerant is required.
How to properly operate an Atlant refrigerator with one compressor
Term refrigerator service Atlant depends on compliance with operating rules. Here are the key recommendations:
Installation and first switching on
- 📏 Distance to the wall —at least
5 cmfor condenser ventilation. - ☀️ Avoid direct sunlight and heat sources (stoves, batteries).
- ⚡ Socket must be grounded and withstand the load
10 A. - ⏳ First start-up — wait
2–4 hoursafter transportation so that the oil in the compressor flows down.
Temperature adjustment
- ❄️ In the freezer compartment, the optimal temperature is
-18°C(position of the thermostat knob on3–4). - 🌡️ In the refrigerator compartment -
+4°C(position2–3). - ⚠️ Do not set maximum cooling (
5–7) unnecessarily - this increases the load on the compressor.
Defrosting and care
- 🕒 Defrost
1-2 times a year(for models with a drip system) or according to the indicator signal (in No Frost). - 🧽 Wash the cameras with a warm soda solution (
1 tbsp per 1 liter of water). - 🚫 Do not use abrasive detergents - they damage the seals.
- 🔧 Check the drainage hole in the refrigerator compartment (clean with a cotton swab).
In models with No Frost (Atlant MXM 2806-90) defrosting occurs automatically, but once a year it is still recommended to wash the fan and evaporator from dust.
⚠️ Attention: If after defrosting the refrigerator Atlant does not turn on, check if the thermal relay (compressor overheating protection) has worked. Wait 30–60 minutes - if this is not the problem, call. masters.
Comparison with two-compressor Atlant models
To understand whether a single-compressor refrigerator is right for you, let’s compare it with two-compressor models Atlant (for example, MHM 2832-90):
| Characteristic | Single-compressor | Two-compressor |
|---|---|---|
| Independent chamber cooling | ❌ No (if a breakdown occurs, both are switched off) | ✅ Yes (each chamber has its own compressor) |
| Temperature control accuracy | Average (depending on the freezer) | High (each chamber is adjusted separately) |
| Energy consumption | Low (250–400 kWh/year) |
High (400–600 kWh/year) |
| Noise level | Average (40–45 dB) |
Low (38–42 dB, since the compressors operate alternately) |
| Cost | Low ( 15–30% cheaper) |
High |
| Maintainability | High (easier to diagnose) | Medium (more nodes) |
Two-compressor models are justified if:
- 🏠 You need turn off the freezer separately (for example, in the country in winter).
- 🍽️ You store a large number of products with different temperature requirements (meat, wine, vegetables).
- 🔇Minimum noise minimal noise (for example, if the refrigerator is in the studio).
In other cases, a single compressor Atlant is a more economical and reliable choice.
FAQ: Frequently asked questions about Atlant refrigerators with one compressor
Is it possible to turn off the freezer compartment in a single-compressor Atlant refrigerator?
No, in models with one compressor it is impossible to turn off only the freezer - The compressor works on both chambers. However, you can set the thermostat to minimum cooling (1 on the handle) to reduce energy consumption if the freezer is empty.
Why is the temperature in the refrigerator compartment higher than in the freezer?
This is normal: the freezer compartment cools first, and the refrigerator compartment receives the "residual" cold. If the difference is too large (for example, in the refrigerator compartment +10°C), check:
- 🔧 Thermostat settings (the mode may be set to
Super Freeze). - 🚪 The tightness of the door seals.
- 🧊 Drain hole clogged (if there is water under the vegetable drawers).
How often do you need to defrost an Atlant refrigerator with a drip system?
It is recommended to defrost 1-2 times a yeareven if there is little ice For models with No Frost It is enough to wash the cameras once a year. When defrosting:
- Unplug the refrigerator.
- Take out all the food and shelves.
- Leave the doors open for
4–6 hours(you can speed up the process by placing a container of warm water inside). - Rinse the chambers with a soda solution, wipe dry.
Do not use a hairdryer or sharp objects to remove ice - this can damage evaporator!
Why does the compressor work without stopping?
Continuous operation of the compressor can be caused by:
- 🔥 High room temperature (for example, if the refrigerator is located next to the stove).
- 🧊 Refrigerant leak (refilling required).
- 🚪 Frequent opening of doors or damaged seals.
- ❄️ Clogged capillary tube (refrigerant does not circulate).
- 📉 Malfunction of the thermostat (does not turn off the compressor).
If after checking the seals and the temperature in the room the problem remains, call a technician.
What is the refrigerant used in Atlant refrigerators?
Modern models Atlant are used:
- 🔵 R-134a —in most refrigerators produced after 2010. Safe for the ozone layer.
- 🟢 R-600a (isobutane) - in new energy-efficient models (for example, MHM 2835-080). compressor or in the refrigerator passport.
You can find out the type of refrigerant by looking at the sticker on the compressor or in the refrigerator's passport. Never refill the refrigerant yourself it is dangerous and requires certified equipment!