Understanding exactly how your household unitfunctions is the first step to proper operation and timely identification of faults. Refrigerators of the brand Indesit, despite the differences in the model ranges, are based on time-tested principles of the compression cycle. Knowledge of the basic circuit helps the owner not to panic when strange sounds or temperature changes appear, but to clearly identify the source of the problem.
Inside the metal case hides a complex system of interconnected components, each of which plays a critical role. The safety of products depends on serviceability refrigerant circuit and ease of use depends on the operation of electronics. We will analyze each element in detail so that you can confidently navigate the technical structure of your equipment.
Modern models may differ significantly from the classic two-chamber versions released ten years ago. However, the fundamental physics of the cooling process remains unchanged: heat is taken from the internal volume of the chamber and released into the environment. Let's look at exactly which parts are responsible for this continuous process.
The basic principle of operation and the refrigerant circuit
The heart of any refrigerator Indesit is a closed circuit through which a special working substance circulates. Most often, modern models use isobutane (R600a), which is highly efficient and environmentally friendly. The movement of gas is ensured by a motor-compressor, which creates the necessary pressure to change the state of aggregation of the refrigerant.
The process begins with gaseous freon being sucked in by the compressor and compressed, as a result of which its temperature increases sharply. The hot gas under high pressure then enters the condenser, a grille usually located on the back wall of the device. What happens here heat exchange: the gas gives off heat to the air in the room and gradually turns into liquid.
⚠️ Attention: It is strictly forbidden to break the tightness of the refrigerant circuit. A puncture in the evaporator or condenser tube will lead to an immediate release of gas and will require expensive professional repairs with replacement of the compressor.
Next, the liquid refrigerant passes through the capillary tube, where its pressure drops sharply. Once in the evaporator, the substance boils at low temperatures, actively absorbing heat from the refrigerator chambers. After this, the cycle repeats again, providing constant cold.
Compressor group: the heart of the refrigerator
The compressor in technology Indesit is a sealed electromechanical unit located in the lower rear part of the case. It is this that creates the pressure difference necessary for the circulation of freon. Inside the black metal casing there is an electric motor and a piston or inverter gas compression system.
To protect the engine from overloads and voltage surges in the network, start-protection relayis used. This small element controls the starting current and the operation of the windings. If the compressor tries to start, but cannot (for example, due to jamming), the relay opens the circuit, preventing the windings from burning out.
It is important to note that in two-compressor models independent circuits they allow you to adjust the temperature in freezer and refrigerator compartments separately from each other. This improves energy efficiency and accuracy of food storage. In models with one compressor, the cold is distributed through a system of dampers or natural convection.
Evaporation and defrosting system (No Frost and drip)
The evaporator is the very element that directly cools the air inside the chambers. In refrigerators Indesit with the system No Frost the evaporator is hidden behind a plastic panel in the freezer. The air is driven through it by a fan and distributed throughout the entire volume, which prevents the formation of ice on the products.
In a drip system (or “crying evaporator”), the back wall of the refrigeration chamber itself is a cooling element. Periodically, the compressor turns off, the wall thaws, and the condensate flows into a groove, from where it goes through a drain tube into a container above the compressor. This process requires periodic manual defrosting freezing.
Under the evaporator (in the No Frost system)
| System element | Function | Location |
|---|---|---|
| Evaporator | Heat absorption, air cooling | Behind the back wall or in the freezer |
| Fan | Cold circulation air | Inside the freezer compartment (No Frost) |
| Defrosting heating element | Heating the evaporator to remove ice | |
| Drain tube | Draining melt water | Inside the refrigeration chamber, with access to the outside |
The automatic defrosting system in models No Frost is controlled by a timer or an electronic module. The heating element (heating element) is periodically turned on, which melts the frost on the evaporator. The resulting water does not freeze again, but evaporates or is removed.
Thermoregulation and electronic control
A thermostat (in mechanical models) or an electronic sensor (in models with a display) is responsible for maintaining the set temperature. The thermostat Indesit is a device with a bellows that is sensitive to changes in gas pressure in a capillary tube, the end of which is fixed to the evaporator.
When the temperature in the chamber reaches the lower limit, the thermostat contacts open and the compressor stops. As the temperature rises, the process repeats. In electronic versions temperature sensors (thermistors) transmit data to the control board, which decides whether to turn on the compressor or fan.
What is a defrost sensor?
A defrost sensor is a thermistor that controls the temperature evaporator during the defrost cycle. It tells the control board when the ice has completely melted in order to turn off the heating element and not overheat the system.
The control module (board) in modern refrigerators is the “brain” of the device. It processes signals from all sensors, controls the light, indication and operation of the compressor. Failures in the operation of electronics often manifest themselves in the form of flashing indicators or failure of the unit to turn on.
⚠️ Attention: Voltage surges in the electrical network can damage the electronic control module. To protect expensive equipment Indesit it is recommended to use a voltage stabilizer or surge protector.
Refrigeration circuit and insulation
The efficiency of the refrigerator directly depends on the quality of the thermal insulation. The casing Indesit is filled with polyurethane foam insulation, which is poured between the inner plastic casing and the outer metal casing in the factory. This material has low thermal conductivity.
Violation of the integrity of the insulating layer (for example, due to careless transportation or mechanical damage) leads to the formation of “cold bridges”. Condensation, rust or ice may appear in these places, and the compressor will be forced to work almost non-stop, trying to compensate for the heat influx.
The rubber seals on the doors are also part of the thermal insulation circuit. They should fit snugly around the entire perimeter. If the magnetic tape is weakened or the rubber is cracked, cold air will evaporate, and warm air will flow inside, disturbing temperature balance.
☑️ Checking the door tightness
Typical malfunctions and their connection with the device
Understanding the device helps diagnose problems. For example, if the refrigerator Indesit hums but does not cool, most likely the problem is in the compressor (does not start) or a freon leak. If the unit operates constantly, but the temperature does not drop below +10 degrees, the capillary tube may be clogged or the thermostat has failed.
The appearance of water on the floor often indicates a clogged drain hole or a displacement of the condensate tray above the compressor. In models No Frost an ice coat in the refrigeration chamber may indicate a malfunction of the defrost system (the heating element or sensor has burned out).
Noisy operation can be caused by vibration of the case against the wall, improper installation (the legs are not adjusted) or wear of the fan bearings in the No Frost system. Diagnostics begins with the exclusion of external factors before calling a specialist.