Refrigeration equipment of the Italian brand Ardo has established itself as reliable equipment that can serve for decades. Understanding exactly how this unit functions is necessary not only for engineers, but also for ordinary users who want to extend the life of the device. Knowledge of the basic physical processes occurring inside the case helps to properly operate the equipment and quickly diagnose malfunctions.
The operation of any model, be it classic Ardo CO 1410 or more modern versions, is based on a continuous cycle of refrigerant circulation. This process obeys the laws of thermodynamics, where heat is transferred from the internal chamber to the external environment. Compressor acts as the “heart” of the system, creating the necessary pressure for the movement of freon along a closed circuit.
The cooling efficiency directly depends on the serviceability of all components and the tightness of the system. If you notice that the device operates intermittently or makes unusual sounds, this may indicate a problem in the circulation cycle. We will analyze in detail each stage of the work so that you can clearly understand what is happening behind the walls of your kitchen assistant.
The basic principle of cooling and the refrigerant cycle
The fundamental operation scheme of a refrigerator Ardo is based on the ability of substances to absorb heat during evaporation and release it during condensation. The refrigerant, most often freon, circulates through a system of tubes, constantly changing its state of aggregation. In the evaporator, located inside or behind the rear wall of the chamber, liquid freon boils at low temperatures, actively absorbing heat from the products.
After passing through the evaporator, the gaseous refrigerant is sent to the compressor. Here the gas is compressed, which leads to a sharp increase in its temperature and pressure. Next, the hot gas enters the condenser - a grille on the rear panel, where it is cooled by the room air and turns into a liquid state, releasing the accumulated heat.
⚠️ Attention: In modern models Ardo various types of refrigerants can be used. When repairing or refilling, it is strictly forbidden to mix different brands of freon, as this will lead to a chemical reaction and failure of the compressor.
The key element separating the high and low pressure zones is a capillary tube or thermostatic valve. It is here that the refrigerant expands sharply before entering the evaporator, which causes the cooling effect. Circulation must be continuous to maintain a stable temperature.
The role of the compressor and the start relay
The compressor in refrigerators Ardo usually is a sealed type piston unit located in the lower rear part of the housing. Its job is to suck refrigerant vapor from the evaporator and force it into the condenser under high pressure. The noise level of the entire device depends on the quality of operation of this unit. energy efficiency and the noise level of the entire device.
To start the compressor engine, a starting relay is used. This small element supplies a short-term impulse to the starting winding so that the rotor begins to rotate. Models Ardo often use relays with a posistor or electromagnetic type. If the relay is faulty, the compressor will hum but not start, or it will start and immediately stall.
The thermal relay protects the electric motor from overheating. It opens the power circuit if the temperature of the windings exceeds permissible limits. Frequent shutdowns may indicate overload or malfunction of the compressor itself, which requires the intervention of a specialist.
- 🔹 The piston group creates the pressure necessary to circulate gas through the system.
- 🔹 Electric motor drives the compressor shaft, consuming electricity.
- 🔹 Valves (inlet and outlet) control the direction of movement of freon, preventing reverse current.
It is important to note that modern inverter models, if they are presented in the line, work on a different principle, smoothly regulating shaft rotation speed. However, classic models Ardo work in start-stop mode, turning on when the temperature rises and turning off when the specified parameters are reached.
Heat removal system: condenser and evaporator
Heat exchange is a critical stage in the operation of the refrigeration circuit. The condenser, which is a coil of tubes with welded fins or wire, is located on the outer rear wall. Its function is to dissipate the heat that the refrigerant has taken from the inner chamber. For effective operation, this unit requires a free flow of air.
An evaporator is located inside the chamber. In classic models Ardo this is a hidden foam circuit or an open coil behind a plastic panel. This is where freon boils. The temperature of the evaporator can drop to -20°C and below, which leads to freezing of moisture from the air on its surface.
⚠️ Attention: Contamination of the condenser with dust and pet hair reduces heat transfer by 30%. This forces the compressor to work longer, increasing energy consumption and wear of parts.
For models with a system No Frost or Frost Free the process is complicated by the presence of a fan that forcibly circulates cold air from the evaporator through the chambers. In such systems, the evaporator is hidden and located separately, often in the freezer or between compartments.
The efficiency of heat transfer depends on:
- ❄️ The cleanliness of the outer surface of the condenser.
- ❄️ The integrity of the thermal insulation layer of the housing.
- ❄️ Tightness of door seals, preventing the influx of warm air.
Electronic control and thermoregulation
Maintaining the set temperature in refrigerators Ardo is carried out thanks to a control system. Older and budget models use mechanical thermostat. This device physically opens the contacts when a certain temperature is reached, stopping the compressor. The adjustment is made by turning the knob inside the chamber.
More modern versions are equipped with an electronic control unit. Temperature sensors (thermistors) constantly transmit data to the controller. The electronics analyzes and decides whether to turn on the compressor, fans or defrost system. This allows you to maintain the temperature with an accuracy of one degree.
If the electronics malfunction, the refrigerator may behave inappropriately: it will not turn off, will not turn on, or the indicators will blink randomly. Diagnosis of such malfunctions requires special equipment to check the resistance of the sensors.
Why is the temperature indicator blinking?
The blinking of the indicator on the control panel of the Ardo refrigerator most often indicates that the temperature in the chamber is rising above the permissible norm. This may be caused by warm food being loaded, the door not closing properly, or a faulty cooling system. If the flashing does not stop after defrosting and checking the seal, diagnostics of the sensors is required.
| Component | Function | Typical malfunction |
|---|---|---|
| Thermostat | Mechanical switching on/off of the compressor | Sticking of contacts, loss of sensitivity |
| Thermistor | Transfer of temperature data to the control unit | Change in resistance, open circuit |
| Control unit | Signal processing and control of nodes | Combustion of board elements, software failure |
| Defrost heating element | Heating the evaporator to remove ice | Spiral burnout, wire break |
Specifics of the No Frost system in Ardo
Many models Ardo equipped with an automatic defrosting system, known as No Frost or partial Frost Free. The main difference from the drip system is that there is no need to manually remove ice. In such refrigerators, moisture does not settle on the food and walls, but is removed outside.
The defrosting process starts automatically using a timer. This usually happens every 8-12 hours of compressor operation. At this moment, Defrost heating element, located near the evaporator, turns on. The ice melts and the water flows into a special tray, from where it evaporates naturally.
The most important element here is the defrost sensor (defroster). It monitors the temperature of the evaporator and turns off the heating element when all the ice has melted, preventing overheating. If this sensor is faulty, the system may either not start defrosting (which will cause an ice block to form) or heat constantly (which will melt the plastic).
☑️ Checking the No Frost system
The fan in the No Frost system plays a key role. It blows cold air from the freezer into the refrigerator compartment through special air ducts. If the fan stops due to icing or motor failure, circulation stops and the food in the upper compartment stops cooling.
Typical problems and their impact on operation
Even reliable equipment Ardo can eventually encounter malfunctions. Understanding how a unit operates normally helps identify anomalies. One of the common problems is freon leakage. In this case, the compressor works continuously, trying to gain temperature, but there is no cold.
Clogged capillary tube is another common problem, especially in older models. Oil breakdown products or moisture clog the narrow hole, stopping circulation. The symptoms are similar to a leak, but the compressor may be very hot, and the condenser may be only partially cold.
⚠️ Attention: If you find an oily stain under the refrigerator or on the floor next to it, this is a sure sign of a freon leak along with the oil. You cannot operate such a device - the compressor will burn out without cooling.
Electrical problems often manifest themselves in the failure of the start relay. The compressor tries to start, there is a click, a buzz, and a click again - the protection turns off the power. Replacing the relay is an inexpensive procedure and can often be solved with your own hands if you have basic skills.
Operating recommendations for extending service life
For the mechanism to work like a clock, you must follow simple rules. Do not place hot food inside as this will put excess stress on the compressor and upset the temperature balance. Let the food cool to room temperature before serving.
Regularly check the integrity of the rubber door seal. If it does not fit tightly, warm, moist air constantly enters the chamber. This leads to increased ice formation and increased compressor cycles. The seal should be wiped with a soft, damp cloth.
Ensure ventilation of the rear wall. The refrigerator Ardo should not stand close to the wall or furniture. A gap of 5-10 cm is necessary for free air circulation around the condenser. Failure to comply with this rule will lead to overheating and reduced efficiency.
- 🔸 Once a year, vacuum the condenser from the back to remove dust.
- 🔸 Make sure that the water drain (in drip models) is not clogged with crumbs.
- 🔸 Do not overload the shelves so that do not block the air flow inside.
Following these recommendations will allow your refrigerator Ardo to operate stably for many years. Remember that prevention is always cheaper than major repairs or replacement of the compressor.
Why does the Ardo refrigerator hum loudly?
The humming noise can be caused by vibration of the compressor if it touches the housing or pipes. It could also be a faulty fan in the No Frost system or simply an uneven installation. Check the adjustable feet.
How often should the equipment be turned on and off?
In normal mode, the operating cycle is approximately 15-20 minutes of work and 20-30 minutes of rest. If the compressor turns on too often or works without stopping, this is a sign of a malfunction.