How the Ariston refrigerator works: complete diagram and principle of operation

Understanding exactly how your household unit functions is the first step to its proper operation and timely maintenance. Ariston refrigerators, despite the variety of model ranges and years of manufacture, are based on time-tested engineering solutions that ensure stable cold in the chambers. Unlike simple ice chests, modern models are complex thermodynamic mechanisms, where each element plays a critical role.

You don't need to be a graduate physicist to understand the basic principles of refrigerant circulation and electrical circuits. Ariston equipment designed with modularity in mind, which allows, if you have certain skills, to diagnose faults without immediately resorting to calling a technician. We will take a detailed look at what is hidden behind the back wall and how the key components of the system interact with each other.

Knowledge of the internal structure will help you distinguish a minor malfunction that you can fix yourself from a serious breakdown that requires professional intervention and special tools. Let's dive into the "anatomy" of your refrigerator so that you can accurately imagine what processes occur inside the case after the device is plugged in.

The basic principle of the refrigeration cycle

The fundamental basis for the operation of any refrigerator, including models Aristonis the continuous circulation of refrigerant (freon) in closed loop. This process is based on the ability of substances to absorb heat during evaporation and release it during condensation, which allows thermal energy to be transferred from the internal chamber to the outside.

The key element here is compressor, which is often called the “heart” of the unit. It creates the necessary pressure, forcing the refrigerant to move through the pipe system. When freon gas is compressed by a compressor, its temperature rises sharply, after which the hot gas enters the condenser, usually located on the rear panel or hidden in the side walls.

⚠️ Attention: The cooling system is under high pressure. An attempt to depressurize the circuit yourself or replace tubes without a vacuum pump and copper/aluminum soldering skills will lead to irreversible damage to the equipment and a health hazard.

Passing through the condenser coil, the hot gas cools and turns into liquid, giving off heat to the environment. Next, the liquid refrigerant enters capillary tube a very thin long channel that serves as a choke, sharply reducing the pressure before entering the evaporator. It is in the evaporator, located inside or behind the chamber wall, that freon boils at low temperatures, which ensures cooling of the products.

Compressor group: types and features of Ariston

In refrigerators Ariston over the years, various types of motor-compressors have been used, from classic piston units to more modern inverter models. It is the compressor that creates the pressure difference necessary for the circulation of the refrigerant, and its serviceability directly affects energy efficiency and noise levels.

Most old and middle-aged models are equipped piston compressors with a start relay. When voltage is applied, the motor windings create a magnetic field that starts the rotor, and the starting relay turns off the starting winding after reaching speed. In newer lines you can find inverter compressorswhich operate smoothly, without constant switching on and off, adjusting power depending on the load.

• 🔧 Start-protective relay: a critical unit that provides an impulse to start the motor and turns it off when overloaded or overheated.
• 🌡️ Thermal relay: protects the motor windings from combustion when the permissible housing temperature is exceeded.
• ⚙️ Muffler: a small capacitance on the output pipe that dampens pulsation gas and reduces vibration noise.

When diagnosing, it is important to understand that the compressor is a sealed unit that cannot be repaired at home. If electric motor the piston group is burnt out or mechanically jammed, a complete replacement of the unit is required. However, often the problem lies not in the motor itself, but in its power supply circuit or cooling system.

Defrosting system: from drip to No Frost

One of the most important characteristics of refrigerators Ariston is the type of defrosting system evaporator. When working on cold surfaces, moisture from the air inevitably condenses and turns into frost or ice. The mechanism for removing this ice is radically different in different models.

In classic models with drip system (Direct Cool), the evaporator is hidden in the rear wall of the refrigerator compartment. While the compressor is operating, the wall freezes and moisture freezes on it in the form of frost. When the compressor is turned off by a signal from the thermostat, the wall thaws and the water flows into the groove, and then through the drainage channel into the evaporation tank above the compressor, where it safely evaporates.

The system No Frost (or Full No Frost) is more complicated. Here the evaporator is located outside the chambers, usually in a special compartment between the freezer and refrigerator compartment or at the top of the freezer. The air is forced to circulate through the chambers using a fan, passing through a cold evaporator.

In models Ariston No Frost a timer (or electronic module) and a defrosting temperature sensor are responsible for the defrosting process. Periodically, the system goes into defrost mode, the heating element melts the ice, and the water goes into the drain. If this cycle is disrupted, the refrigerator stops freezing due to blockage of the air ducts with ice. Evaporator heating element, timer (or electronic module) and defrost temperature sensor. Periodically, the system goes into defrost mode, the heating element melts the ice, and the water goes into the drain. If this cycle is disrupted, the refrigerator stops freezing due to ice blocking the air ducts.

Why does ice sometimes appear in No Frost?

If ice appears in the chamber in the No Frost system, most often the culprit is a leaky door seal or clogged drainage. Air with humidity gets inside and does not have time to escape, freezing on the products or the bottom of the chamber.

Electrical circuit and controls

The "brain" and nervous system of the refrigerator Ariston is an electrical circuit that coordinates the operation of all nodes. In older models, this function was performed by a combination of mechanical thermostat and defrost timer, while modern units are controlled by a complex electronic module.

Thermostat (or temperature sensor in electronic versions) constantly monitors the temperature in camera. As soon as it rises above the set value, the compressor power circuit is closed. In systems with electronics, the signal is sent to control board, which analyzes data from several sensors and makes a decision to start the motor, turn on the fan or start defrosting.

An important element of protection is starting relay, which is located directly on the compressor housing. It provides a short-term voltage supply to the starting winding of the engine. If the relay is faulty, the compressor will hum, but will not start, or will turn on and off immediately with a characteristic click.

⚠️ Attention: When checking electrical circuits, be sure to disconnect the refrigerator from the mains. Using a multimeter with the device turned on without the appropriate skills may result in a short circuit or electric shock.

In models with a display and control panel, the user can adjust temperature settings. The microcontroller on the board is responsible for processing these commands. Often, failures in the operation of electronics are caused by power surges in the network, therefore, to prolong life control module it is recommended to use stabilizers.

Case design and thermal insulation

The efficiency of the refrigerator Ariston depends not only on the serviceability of the mechanisms, but also on the quality of the thermal insulation. The body is a “sandwich” consisting of an outer metal or plastic casing, an inner plastic box and a layer polyurethane foam between them.

Polyurethane foam is poured in liquid form into the space between the walls, where it expands and hardens, forming monolithic structure with millions of closed cells filled with gas. It is this gas that has low thermal conductivity. The quality of foaming directly affects energy consumption: if there are voids in the insulation (“bald spots”), the refrigerator will work more intensely.

The refrigerator door is also equipped with insulation and magnetic sealing along the perimeter. The seal ensures the tightness of the chamber, preventing warm air from entering from the outside. In some models Ariston additional heating elements (anti-condensation) are built into the doors, which prevent dew from forming on the ends of the door in conditions of high humidity.

Mechanical dents on the outer wall can disrupt the integrity of the inner insulation layer, which will lead to local freezing of the wall and the formation of condensation outside.

Typical malfunctions associated with the device

Knowing the device of the refrigerator Ariston, the breakdown can be more easily identified. Most problems are associated with a malfunction of one of the nodes described above. For example, if the compressor works without stopping, but there is no cold, there is likely a freon leak or a blockage of the capillary tube.

If the “fur coat” is frozen in the chamber, but the fan is humming, the problem lies in the defrost system: the heating element has burned out, the defrost relay is stuck, or the sensor has failed. In models with a drip system, a common problem is a clogged drain hole, which causes water to flow into the chamber and not into the tray. No Frost the “coat” is frozen, but the fan is humming, the problem lies in the defrost system: the heating element has burned out, the defrost relay is stuck, or the sensor has failed. In models with a drip system, a common problem is that the drainage hole becomes clogged, causing water to flow into the chamber rather than into the tray.

• ❄️ Insufficient cooling: refrigerant leak, compressor malfunction, or poor air circulation.
• 💧 Water on the floor: drain clogged, displaced or damaged receiving funnel, crack in the tray.
• 🔊 Extraneous noise: wear of fan bearings, incorrect installation (misalignment), vibration of tubes on the body.

Diagnostics should always begin with a visual examination and analysis of symptoms. Understanding how your specific unit works will allow you to make the right decision: replace the seal and clean the drainage yourself or call a specialist for complex repairs refrigeration circuit.

Is it possible to change the compressor in an Ariston refrigerator yourself?

Theoretically, yes, if you have soldering skills copper pipes, you have access to a vacuum pump and filling equipment. However, in practice, replacing a compressor requires professional sealing of the system and precise dosage of refrigerant. An error will lead to rapid breakdown of the new compressor.

Why does the Ariston refrigerator hum loudly when starting up?

A humming noise when starting up can be caused by wear of the starting relay, which makes it difficult to start the motor, or vibration of the compressor itself on the frame. Also, the fan in the No Frost system often becomes a source of noise if there is ice on its blades or it is unbalanced.

How often do you need to defrost a No Frost refrigerator?

The No Frost system does not require regular defrosting to remove ice, as this happens automatically. However, manufacturers recommend turning off the device once every 6-12 months to carry out general cleaning, wash the internal surfaces and check the condition of the seals.

What to do if the light in the Ariston refrigerator stops burning?

First of all, check the light bulb itself - it could simply burn out. If replacing the lamp does not help, the problem may be in the contacts of the door switch or in the wiring going to the lamp. In electronic models, the control board may be responsible for the light.