The situation when products are at the point of sale begin to deteriorate or, conversely, freeze, is familiar to many small business owners. Most often, the problem lies in incorrect settings refrigeration equipment. Unlike household models, industrial display cases require a more careful approach to adjusting climatic parameters, since the safety of the goods and the profit of the store directly depend on this.
Violation of the temperature regime can lead to damage to expensive products, be it deli meats, dairy products or confectionery products. If you notice that the indicators show values higher or lower than normal, you must immediately intervene in the system. In this article we will look at how to reduce the temperature in a refrigerator display case, what controllers are used and what to do if standard adjustment does not help.
It is important to understand that different types of display cases - confectionery, meat, universal - have their own optimal operating ranges. An attempt to set the same parameters for all departments can lead to compressor failure or product damage. Let's take a detailed look at the setup process and possible causes of failures.
Optimal temperature conditions for different products
Before you start making adjustments, you need to clearly understand what kind of product will be stored in the display case. Temperature Condition it's not easy the number on the screen is a critical security parameter. For meat and fish departments, more intensive cooling is required to suppress the growth of bacteria, while for vegetables or ready-made food such conditions can be detrimental.
The average temperature in a refrigerated display case usually varies in the range from 0 to +8 degrees Celsius. However, for storing fresh meat or fish, it is recommended to set values closer to 0...+4 °Cto extend shelf life. Confectionery display cases often operate at higher temperatures, around +4...+8 °C, so that creams and jellies do not lose their structure.
If you plan to store different groups of products, you will need equipment with separate cooling zones or a compromise value, which, alas, is not always ideal for each type of product. The wrong choice of mode leads either to drying out of the product or to its rapid spoilage.
- 🥩 Meat display case: optimal range from 0 to +4 °C, requires stable cold without surges.
- 🍰 Confectionery display case: range from +2 up to +8 °C, it is important to avoid freezing of creams.
- 🥗 Universal display case: average values are about +4...+6 °C, suitable for a wide range.
- 🐟 Fish department: strict mode from -1 to +2 °C to prevent reproduction microflora.
It is worth considering that the temperature inside the display case may be unevenly distributed. In areas where cold air directly escapes evaporator always colder than in the far corners. Therefore, when loading goods, it is important to follow the rules of the commodity neighborhood and not block the ventilation holes.
Setting up electronic temperature controllers
Modern refrigerated display cases are equipped with electronic control units that allow you to precisely regulate the operation of the compressor. The most common controller models are Eliwell, Dixell, Carel and their analogues. The setup process is similar, but has its own nuances that you need to know before intervening in the system.
To change the temperature setpoint, it is usually enough to press and hold the “Set” (or “Fnc”) button for 3-5 seconds. The display will start flashing the current value. Using the up/down arrows or the "+/-" buttons, you can set the required parameter. After selecting the value, you need to confirm the action by pressing “Set” again.
☑️ Controller setup algorithm
⚠️ Attention: Do not change the settings too often. The compressor takes time (usually 10-15 minutes) to reach a new operating mode. Frequent switching can lead to premature wear of the engine.
Some controller models have a division into parameters for the user and for the service engineer. The user can only change the target temperature, while hysteresis (difference between on and off temperatures) and other technical parameters are hidden in the service menu. Access to them is often protected by a password or a combination of buttons.
What is hysteresis and why is it needed?
Hysteresis is the difference between the temperature at which the compressor turns on and off. For example, if the setpoint is +4°C and the hysteresis is 2°C, the compressor will turn off at +4°C and turn on again only at +6°C. This prevents frequent engine starts, which saves equipment life.
Adjusting mechanical thermostats
In older or budget models of display cases, mechanical thermostats can be used. They are a device with a rotary knob on which a scale is printed from 1 to 7 or from Min to Max. In such systems there is no digital display, and control is carried out visually or using an external thermometer.
The principle of operation is simple: turning the knob clockwise usually increases cooling (decreases the temperature), and counterclockwise - weakens it. However, the numbers on the scale do not correspond to degrees Celsius. To accurately adjust the temperature, you will need an external thermometerwhich must be placed inside the display case.
- 🌡️ Install the thermometer in the center of the work area, away from the walls.
- ⚙️ Turn the regulator knob one notch to the side increase in cold.
- ⏳ Wait 30-40 minutes for the temperature background to stabilize.
- 👀 Take readings and, if necessary, repeat the adjustment.
Mechanical thermostats are less accurate than electronic ones and have greater inertia. The temperature spread when using them can be 2-3 degrees. In addition, over time, the calibration of such devices may get lost, and the position of knob “3” will no longer correspond to the desired mode.
Table of correspondence between modes and products
For ease of setup, below is a table that will help you navigate the recommended values for different groups of products. Remember that these values are average, and for a specific type of product it is better to check the manufacturer's requirements on the packaging.
| Product type | Recommended temperature (°C) | Acceptable range | Storage features |
|---|---|---|---|
| Fresh meat (beef, pork) | +2 ... +4 | 0 ... +5 | Requires stable cold, avoid freezing |
| Poultry and offal | +1 ... +3 | 0 ... +4 | High spoilage rate, requires strict control |
| Fish and seafood | 0 ... +2 | -1 ... +3 | It is advisable to store on ice or in the zero chamber zone |
| Dairy products | +2 ... +6 | +2 ... +8 | Sensitive to changes, can sour |
| Confectionery | +4 ... +8 | +2 ... +10 | Important do not overdry or freeze the cream |
Using this table will allow you to quickly adjust refrigerated display case to the current assortment. If you sell a mixed assortment, choose the mode corresponding to the most perishable product in stock.
Reasons for insufficient cooling of the display case
There are cases when the regulator knob is turned to maximum, but the temperature in the display case does not drop. This is a signal that the problem is not in the settings, but in the technical condition of the equipment. There are a number of common malfunctions that prevent the system from reaching the specified mode.
One of the most common reasons is contamination of the capacitor. If the heat exchanger is clogged with dust, lint, or dirt, the refrigerant cannot effectively transfer heat to the environment. As a result, the compressor works continuously, but does not produce cold. Also, the cause may be a leak refrigerant (freon) or a malfunction of the evaporator fan.
⚠️ Attention: If the compressor runs without stopping and the temperature does not decrease, under no circumstances leave the equipment in this condition for a long time. This can lead to the motor burning out or the start relay failing.
Another important factor is the tightness of the chambers. Check the rubber seals on the display doors. If they are damaged or do not fit tightly, warm air from the room constantly flows inside, and the cooling system simply cannot cope with the load. Also make sure that the display case is not close to the wall or heat sources (batteries, sunlight).
Maintenance and failure prevention
To avoid situations where you need to urgently reduce the temperature or save a product, it is necessary to regularly carry out preventive maintenance. The condenser should be cleaned at least once every 3-4 months, and monthly in dusty areas. This can be done with a vacuum cleaner or a soft brush.
It is also important to monitor the defrost system. If the drain hole is clogged, water will accumulate at the bottom and freeze, forming an ice coat on the evaporator. Ice acts as a thermal insulator, blocking cooling. Periodically check whether water flows freely into the drainage tray.
- 🧹 Regularly clean the ventilation grilles from dust.
- 🔍 Check the integrity of the door seals.
- ❄️ Monitor the defrosting process, do not allow ice formation.
- 📏 Do not overload the display case with goods above the loading line (usually marked with a red line).
Following these simple rules will extend the life of your equipment and ensure stable temperature conditions. Remember that prevention is always cheaper than repairs or scrapped products.
How often do you need to defrost a display case?
Modern display cases with the No Frost system do not require manual defrosting; it is enough to wash them when they get dirty. Models with a drip system or static cooling must be defrosted manually 1-2 times a year or when an ice crust more than 5 mm thick is formed.
Frequently asked questions (FAQ)
Why does the display case hum more strongly after changing the settings?
An increase in hum may be due to the fact that the compressor began to work more intensively or at high speeds to achieve a new, lower temperature. If the hum is accompanied by vibration or continues constantly after reaching the mode, it may be necessary to replace the compressor shock absorbers or check the fastening of the pipelines.
Is it possible to store food at temperatures below 0 degrees in a regular display case?
Ordinary refrigerated display cases (medium temperature) are not intended for freezing. A decrease in temperature below 0°C can lead to deterioration of the structure of the products (crystallization of moisture) and damage to the equipment itself, since the evaporator can freeze too quickly and the compressor can wear out. For freezing, chest freezers or low-temperature islands are needed.
What to do if the electronic controller shows an error (for example, E1 or AL)?
Error codes indicate a specific malfunction of the sensor or system. For example, E1 often means a break in the temperature sensor, and AL means an emergency (critical temperature rise). It is necessary to check the instructions for the specific controller model (Dixell, Eliwell) to decipher the code. In most cases, a sensor replacement or specialist intervention will be required.
How to quickly cool an empty display case after washing?
To quickly increase the temperature, close the display case with night curtains (if any), provide good ventilation around the condenser and do not open the doors unless necessary. You can also pre-cool the room where the display case is located. It is not recommended to load warm products into an empty display case - it is better to cool the chamber in advance.