Refrigeration equipment for trade brand Coca-Cola is a standard in the HoReCa industry, providing ideal presentation of drinks. The operating principle of these units is based on the classic compression cycle, which, despite its apparent simplicity, requires precise adjustment of all components. Understanding exactly how the refrigerant circulates and how the temperature is controlled is necessary for efficient operation and prompt troubleshooting.
Unlike household models, commercial display cases Coca-Cola are often equipped with an enhanced ventilation system and specific thermostats designed for frequent opening of doors. Heat transfer in such systems occurs more intense, and the requirements for the tightness of the circuit are higher. If you plan to service the equipment yourself or simply want to understand the causes of noise, it is important to study each design element in detail.
In this article we will analyze the physical basis of cooling, consider the role of each component and give practical advice on diagnostics. Knowledge of the device will allow you to avoid costly mistakes during operation and extend service life equipment.
Physical basis of the compression cycle
The heart of any refrigerator Coca-Cola is a closed circuit through which the refrigerant circulates. The process begins with a compressor, which compresses freon gas, increasing its pressure and temperature. After compression, the hot gas enters the condenser, usually located on the rear panel or at the bottom of the case.
The key stage of heat transfer occurs here. Condenser It is a curved tube with fins that transfers heat to the environment. Passing through this unit, the refrigerant cools and turns into a liquid state. It is important to understand that the efficiency of this process directly depends on the cleanliness of the radiator and the temperature in the room.
- ❄️ The compressor creates pressure, forcing the refrigerant to move through the system.
- 🔥 The condenser cools the gas, turning it into liquid and giving off heat.
- 💧 The capillary tube sharply reduces the liquid pressure in front of the evaporator.
- 🌬️ The evaporator absorbs heat from the chamber, turning the refrigerant back into gas.
Next, the liquid refrigerant passes through the capillary tube or thermostatic valve, where the pressure sharply falls. Once in the evaporator, the substance boils at a low temperature, actively absorbing heat from the inner chamber of the refrigerator. It is this process that ensures the cooling of drinks to the specified parameters.
⚠️ Attention: If the evaporator or condenser tubes are damaged, freon immediately escapes. An attempt to solder aluminum tubes at home without special equipment often leads to complete failure of the unit.
Key components of the cooling system
Having dealt with the cycle, it is worth detailing the role of individual units. The compressor in refrigerators Coca-Cola usually of the sealed type and mounted on shock absorbers to reduce vibration. Its power is selected taking into account the volume of the chamber and the climatic class of the device.
The most important control element is thermostat or an electronic controller. Mechanical models use a capillary tube filled with a temperature-sensitive gas that responds to changes within the chamber. Electronic analogues read data from sensors and control the compressor with high accuracy.
| Component | Function | Typical fault |
|---|---|---|
| Compressor | Refrigerant compression and circulation | Interturn short circuit, jamming |
| Thermostat | On/off temperature adjustment | Contact sticking, loss of tightness |
| Start relay | Starting the compressor motor windings | Contact burnout, breakage of the bimetallic plate |
| Fan | Forced air circulation (No Frost) | Bearing wear, winding breakage |
The system No Frost, if provided by the model, includes a fan and a defrosting heating element. The fan drives cold air from the evaporator through the chamber, providing uniform cooling without the formation of ice on the food. The heating element is periodically turned on to defrost the evaporator.
The electrical circuit also includes a protective thermal relay that opens the circuit when the compressor overheats. This is a critical safety element that prevents the motor windings from burning out during prolonged operation or power surges.
Why does the compressor hum?
The hum can be caused by vibration of the housing against the wall, wear of the motor bearings, or improper installation of the refrigerator. If the hum is replaced by a metallic clang, immediate diagnosis is required.
Air circulation and ventilation system
The efficiency of the refrigerator Coca-Cola depends not only on the cold, but also on proper air exchange. In models with forced circulation, air passes through the evaporator, cools and is supplied to the chamber through special channels. Air ducts must be free from obstacles.
Damps regulate the flow of cold air, mixing it with warm air to maintain the set temperature. If the damper is stuck in the closed position, the chamber will become too warm, and if it is open, drinks may freeze at the back wall.
- 🌀 The fan should operate silently, without beating or whistling.
- 🚫 Do not block the outlet openings of the air ducts with bottles.
- 🌡️ Temperature sensors must be located in the free air flow area.
Particular attention should be paid to the condenser area. If the refrigerator is built into a niche or stands close to the wall, heat dissipation is impaired. Compressor overheating in such conditions it leads to an emergency shutdown and a reduction in the service life of the equipment.
Electrical circuit and temperature control
Temperature control is carried out through a circuit that includes a thermostat, a starting relay and a protective device. In modern models Coca-Cola an electronic control unit (PCB) may be responsible for this, which reads readings from several sensors.
With mechanical control, turning the thermostat knob changes the pressure in the bellows, which regulates the moment of opening the contacts. Adjustment range usually ranges from +2 to +8 degrees Celsius, which is optimal for carbonated drinks drinks.
⚠️ Attention: Do not attempt to adjust the screws on the thermostat housing without calibration equipment. By changing the factory settings, you risk either constant operation of the compressor or complete downtime.
Electronic controllers allow you to set the exact temperature in 0.1 degree steps. They can also indicate malfunctions with error codes on the display. For example, a flashing indicator may indicate a broken sensor or a problem with the fan.
Typical faults and their diagnosis
The most common problem with commercial refrigerators is loss of cold with the compressor running. This may indicate a freon leak or a clogged capillary system. If the compressor is hot, but the tubes on the back wall are cold, the refrigerant circulation is most likely broken refrigerant circulation.
Another common situation is that the refrigerator does not turn off. The cause may be sticking thermostat contacts or heat leakage through a damaged door seal. Constant operation leads to freezing of the evaporator and failure of the compressor.
- 🔊 Loud noise during startup indicates a problem with the start relay.
- 💧 Water on the floor often indicates a clogged drain hole.
- 🧊 An ice coat on the back wall indicates a malfunction of the defrost system.
For diagnostics, use a multimeter to check the integrity of the compressor windings and thermostat contacts. Chain continuity helps to quickly localize the gap. If the compressor hums but does not start, the piston mechanism may be jammed.
☑️ Diagnosis of lack of cold
Operating rules to extend service life
In order for the refrigerator Coca-Cola to serve for a long time, you must follow the loading rules. Do not place warm food or open the door for longer than necessary. Excessive humidity leads to intense ice formation on the evaporator.
Regular cleaning of the condenser to remove dust is a mandatory procedure, especially if the equipment is located in a room with high foot traffic. A layer of dust of a few millimeters can reduce the efficiency of heat transfer by 30%.
Monitor the condition of the door seal. Cracks and creases in the rubber allow warm air to pass through, causing the compressor to work harder. If defects are found, the seal must be replaced.
⚠️ Attention: Use only mild detergents. Aggressive chemicals can corrode the plastic of the internal panels and damage the varnish coating of metal parts.
Do not overload the shelves. This can lead to deformation of the shelves and disruption of air circulation. Uniform distribution of bottles ensures optimal cooling performance.
How often do you need to defrost?
Refrigerators with manual defrosting require shutdown every 3-6 months, depending on the humidity in the room. No Frost systems defrost automatically.
Frequently asked questions (FAQ)
Why does the Coca-Cola refrigerator vibrate a lot?
Vibration is often caused by the fact that the equipment is not level. Check the leveling feet. Also, a source of noise may be the contact of the condenser tubes with the housing or the vibration of the compressor with the frame. Check the integrity of the rubber shock absorbers.
What to do if it is too cold inside and drinks freeze?
Most likely, the thermostat is faulty or its contacts are stuck. Try turning the adjustment knob several times. If the problem cannot be solved, the thermostat needs to be replaced. Also check whether the capillary tube of the thermostat is pressed too tightly against the evaporator.
How often should the condenser be cleaned?
In a store or cafe, cleaning should be done at least once every 3 months. If there is a lot of dust or animal hair in the room, the interval should be reduced to 1 month. A dirty condenser is the main reason for compressor overheating.
Is it possible to replace the refrigerant yourself?
No, this requires special equipment (vacuum pump, pressure gauge station) and a license. Incorrect refueling will lead to rapid compressor failure. To replace freon, call a specialist.
Why is the temperature indicator on?
The indicator may indicate that the temperature in the chamber is higher than normal. Check that the door is closed tightly, that the refrigerator is not overloaded, and that the fan is running. If after a few hours the temperature has not returned to normal, diagnostics are needed.