Modern household refrigerator brand Candy is a complex electromechanical device designed to maintain a low temperature in an insulated chamber. Understanding exactly how this system functions is necessary not only for repair engineers, but also for every owner who wants to extend the life of his equipment. It is based on a continuous cycle of compression and expansion of the refrigerant, which transfers thermal energy from the internal volume to the outside.
The Italian brand Candy often uses time-tested compressors and efficient air circulation systems. However, despite its reliability, any mechanism requires proper handling. If you know the basic principles of thermodynamics used in your unit, you can quickly notice operating anomalies, such as extraneous noise or insufficient cooling, and prevent serious damage.
In this article, we will analyze each component in detail, from the electrical circuit to the physics of the freon evaporation process. You will learn why condenser heats up, how the defrost sensor works and how the cooling cycle in models with No Frost equals from classic systems. This knowledge will help you operate equipment competently and safely.
Basic refrigeration cycle: physics of the process
The heart of any refrigerator Candy is a closed circuit through which the refrigerant (freon) circulates. This gas has a unique ability to change its state of aggregation at different pressures, which allows it to effectively absorb heat. The cycle begins in the compressor, which creates high pressure, pushing freon gas into the condenser.
In the condenser, presented in the form of a coil on the back wall, the hot gas gives off heat to the environment and turns into a liquid state. The flow then passes through a capillary tube, where the pressure drops sharply. It is this pressure drop that is critical for the next stage - evaporation evaporation.
Having entered the evaporator inside the chamber, the liquid refrigerant boils at a very low temperature, actively absorbing heat from the products. After the evaporator, the gas is sucked back into the compressor and the cycle repeats. This process is continuous and regulated thermostat, which opens the electrical circuit when the set temperature values are reached.
⚠️ Attention: Violation of the tightness of the circuit leads to freon leakage. Self-charging requires special equipment and skills, since the wrong amount of refrigerant can damage the compressor.
It is important to understand that the system is under pressure, and any manipulation of the tubes requires caution. Modern models Candy often use environmentally friendly refrigerants, such as R600awhich require a special approach to maintenance.
Compressor: the heart of the refrigeration system
The compressor in refrigerators Candy most often represents sealed piston-type unit located in the lower rear part of the housing. Its main task is to compress refrigerant vapors and ensure their circulation throughout the system. The compressor engine operates in pulse mode, turning on by a signal from the thermostat or electronic control module.
Inside the housing there is an electric motor and a mechanical part, immersed in oil to lubricate the rubbing parts. When starting, a high starting current occurs, so a thermal protection relay is necessarily present in the power circuit. If the compressor hums but does not start, or is too loud, this often indicates problems with the starting equipment or the motor itself. starting relay and thermal protection relay. If the compressor hums but does not start, or is too loud, this often indicates problems with the starting equipment or the motor itself.
- 🔹 The piston group creates the necessary pressure for the movement of freon along the circuit.
- 🔹 The starting relay provides short-term connection of the second motor windings for starting.
- 🔹 The thermal relay opens the circuit when the windings overheat, preventing the motor from burning out.
Modern inverter models Candy can be equipped with compressors with variable rotation speed, which allows operation to be quieter and more economical. However, classic linear compressors remain the most common and repairable.
When diagnosing faults, the resistance of the motor windings is often checked. To do this, you need to remove the start relay and test the contacts with a multimeter. Normal resistance values depend on the specific engine model, but usually they are in the range from 10 to 40 Ohms for the working winding.
Defrosting and water drainage system
During operation, frost inevitably forms on the evaporator, as moisture from the chamber air condenses on the cold tubes. In models Candy with system No Frost or Frost Free this process is automated. Periodically, according to the timer or hour meter of the compressor, the heating element (heating element) is turned on, which melts the ice.
The resulting water flows into a special pan located above the compressor, where it evaporates naturally. The key element here is the defrost sensor, which monitors the temperature of the evaporator. It turns off the heating element when the ice has completely melted, preventing overheating of the plastic parts and unnecessary energy consumption.
What will happen if the defrost sensor breaks down?
If the defrost sensor fails and does not turn off the heater, the heating element will heat constantly, which will lead to food spoilage, melting of plastic and a possible fire. If it does not turn on the heating, the evaporator will become overgrown with ice and stop cooling.
In systems with manual defrosting (drip type), water simply flows down the back wall into the drainage hole when the compressor is idle. Here it is important to monitor the cleanliness of the drainage channel, since its clogging with food crumbs or mold leads to the appearance of a puddle inside the chamber.
- ❄️ The defrost heating element heats the evaporator to remove ice.
- 🌡️ The defrost sensor (defroster) interrupts heating when it reaches a certain temperature.
- 💧 The drainage system drains melt water into the evaporation tank.
Regular checking of the drainage hole is an important part of care. You can clean it using a soft wire or a special brush, pouring warm water to check the drainage.
Electrical circuit and controls
The electrical wiring of the refrigerator Candy connects the compressor, fans, lighting and control system into a single network. Power is supplied through a cord with a plug, then the current passes through the thermostat. In mechanical models, the thermostat is a device with a bellows filled with gas, which expands or contracts depending on the temperature in the chamber.
In more modern models, control is carried out by an electronic module. It receives data from thermistors (electronic temperature sensors) and controls the operation of the compressor and fan through triacs or relays. Electronics allows you to more accurately maintain the temperature regime and implement additional functions, such as super freezing.
Connection diagram (simplified):220V network -> Thermostat -> Thermal relay -> Start relay -> Compressor
|-> Lighting lamp
|-> Fan (in No Frost)
Diagnostics of the electrical part begins with checking the presence of voltage at the entrance to the refrigerator. If the network is working, but the equipment is not working, check the integrity of the thermostat and start relay. Contacts in connectors often oxidize, which leads to unstable operation.
⚠️ Attention: Carry out all work on checking electrical circuits only with the device disconnected from the network. The use of faulty wires or plugs is unacceptable.
To replace a thermostat or electronic module, partial disassembly of the housing is often required. It is important to remember the order in which the wires are connected so as not to confuse the polarity or purpose of the contacts during assembly.
Comparison of cooling systems: No Frost versus Static
Technology Candy is available with both a classic static cooling system and with forced air circulation (No Frost). Understanding the difference between them helps you choose the right model and avoid disappointment. In static models, the cold comes from the back wall, which periodically becomes covered with frost and then thaws.
The system No Frost ("no frost") uses a fan to move air through a hidden evaporator. The air is cooled, dried and distributed throughout the chamber through special channels. This prevents the formation of ice on food and walls, but can lead to faster drying of uncovered food.
| Characteristics | Static system (Direct Cool) | No Frost system |
|---|---|---|
| Education ice | Requires manual defrosting 1-2 times a year | Automatic defrosting, no ice |
| Humidity | High, food dries more slowly | Low, required product packaging |
| Energy consumption | Lower (no fan and powerful heating elements) | Higher (constant operation of the fan and defrost) |
| Noise | Quieter (only works compressor) | Fan noise is heard |
The choice between these systems depends on your habits. If you prefer to store food in open containers and don’t like to bother with defrosting, No Frost this will be the ideal choice. If maximum freshness of vegetables without packaging and silence are more important to you, consider classic models with a drip system.
Typical faults and their symptoms
Even reliable equipment Candy can fail. Knowing the symptoms allows you to quickly identify the problem. One of the common malfunctions is the failure of the thermostat, which leads either to constant operation of the compressor and freezing, or to a complete lack of cold.
Another common problem is a refrigerant leak. If the compressor runs constantly, but there is no cold, and the condenser (grid at the back) remains cold, most likely the freon has escaped through a microcrack. Also, sensors in the No Frost system often break down, which is why the refrigerator stops defrosting and forms ice inside.
- 🔊 Loud knocking or humming - wear on the compressor or a problem with the fastening.
- 💧 Water on the floor - clogged drainage hole or dislodged tray.
- 🌡️ Unstable temperature - malfunction of the thermostat or sensor.
Diagnosis of most problems begins with an external inspection and listening to the operation of the unit. If you hear the relay clicks, but the compressor does not start, the problem may be in the starter or the motor itself.
☑️ Primary diagnosis
It is important not to ignore the first signs of a malfunction. Timely replacement of the door seal or cleaning the drainage can save the compressor from overload and costly repairs.
Recommendations for operation and care
For a long service life of the refrigerator Candy you must follow a number of simple rules. First of all, this concerns the placement of equipment. Do not install the refrigerator close to the wall, leave a gap for condenser ventilation. Overheating is the main enemy of the compressor.
Regularly wash the internal chambers with a weak soda solution. Do not use abrasives that may damage plastic or enamel. Pay special attention to the door sealing rubber: wipe it from grease and crumbs, check the tightness of the seal. Once a year, it is recommended to defrost static models until the ice completely disappears.
⚠️ Attention: Never use sharp objects (knife, screwdriver) to chip ice. Damage to the evaporator will lead to an immediate leak of freon and expensive repairs, which are often not economically feasible.
Also monitor the loading level of the chambers. A refrigerator that is too full interferes with air circulation, and an empty one loses cold faster when the door is opened. Optimal loading ensures stable temperature conditions and saves energy.
Why does the Candy refrigerator hum or knock loudly?
A loud hum can be caused by vibration of the case against the wall or floor - check the leveling feet and move the equipment. The compressor itself often makes a knocking noise when internal parts wear out or when operating at maximum power. Also, a source of noise can be a fan in the No Frost system if ice is frozen on its blades or it touches the wiring.
How often do you need to defrost a Candy refrigerator?
Models with the No Frost system do not require manual defrosting; it is enough to wash them 1-2 times a year. Classic models with a drip system (Direct Cool) need to be defrosted when the thickness of the ice on the back wall reaches 3-5 mm, usually this happens once every 4-6 months depending on the humidity in the room and the frequency of opening the door.
What does the flashing temperature indicator on the panel mean?
A flashing indicator usually signals that the temperature inside the chamber is rising above normal. This can happen immediately after switching on, after a long defrosting period, or after loading a large amount of warm food. If the blinking does not stop after several hours of operation, check that the door is tightly closed and the seal is in good condition.
Is it possible to transport the Candy refrigerator lying down?
It is highly not recommended to transport modern refrigerators lying down, especially on their sides, where the compressor tubes are located. Oil may leak into the refrigerant circuit, causing water hammer and compressor failure when first turned on. If transportation cannot be avoided, let the equipment stand upright for at least 12-24 hours before turning it on.