Correct Setting up a refrigerated display case is not just a whim, but a critical stage that determines the service life of expensive equipment and the safety of products. Unlike household models, commercial equipment operates under intensive operating conditions, where every degree and percentage of humidity plays a role. Mistakes at the start can lead to rapid damage to the goods or failure of the compressor compressor.
Many entrepreneurs make the mistake of believing that it is enough to simply plug in the device. In fact, there are a number of procedures that must be followed before starting, as well as precise algorithms for adjusting thermostats. Ignoring the rules primary activation often becomes the reason for voiding the warranty.
In this article we will analyze in detail the entire process: from choosing the installation location to fine calibration of temperature conditions. You will learn how to avoid common mistakes and ensure stable operation of your equipment in any conditions.
Primary preparation and selection of installation location
Before proceeding with electrical setup, it is necessary to ensure that the equipment is physically ready for operation. The display case must stand on a perfectly flat surface. If the floor is uneven, use the adjusting screws on the feet to level the cabinet. Misalignment can lead to improper operation door mechanisms and uneven distribution of refrigerant.
It is critical to comply with ventilation requirements. The compressor and condenser generate a large amount of heat, which must be effectively removed.
- 🌡️ The distance to the rear wall must be at least 30-40 cm for free air circulation.
- 🔌 The socket must be grounded and withstand motor starting currents without voltage drop.
- 💡 Avoid direct sunlight and proximity to heating devices so as not to overload the system.
⚠️ Attention: Installing a display case in a niche without an influx of fresh air is strictly prohibited. This will lead to overheating of the compressor and an emergency shutdown through the thermal relay.
After transportation, especially if it was carried out in the cold season, time is required for acclimatization. If the ambient temperature was very different from the warehouse temperature, allow the equipment to stand in the off state for at least 4-6 hours. This is necessary so that condensationformed inside the electronics completely evaporates, and the oil in the compressor returns to working condition.
First launch and temperature stabilization
After the display case is installed and is maintained, the first switch-on can be performed. Do not load any products at this time. An empty chamber must enter operating mode for the system to understand its base load. Typically, this process takes from 2 to 6 hours, depending on the volume of the chamber and the power of the unit.
At the initial stage, it is important to control the operation of the evaporator fans. They should turn on immediately or within a short period of time after the compressor starts. If you hear unusual vibrations or hums, check whether the tubes are touching the housing or other elements.
☑️ Check before loading products
To control, use an external thermometer, placing it in the center of the work area. The readings of the built-in display may have an error, so you should trust only proven devices on the first day. If the temperature does not drop below +10°C after 3 hours of operation, it may require adjustment thermostat.
It is important to understand the difference between static and dynamic cooling. In models with forced circulation air moves faster, so products can become airy if not covered with film. In static models, cooling is slower, but more uniform in humidity.
Adjusting the thermostat and controller
The heart of the adjustment is the correct setting of the parameters on the controller. Modern models use electronic control units, such as Carel, Eliwell or Dixell. Settings are made through the menu, access to which is often protected by a password or a sequence of buttons.
Let's consider the basic parameters that need to be configured for most controllers:
| Parameter | Description | Recommended value |
|---|---|---|
Set Point |
Target temperature in the chamber | +2...+4°C (for meat/fish) |
Differential |
Permissible deviation (hysteresis) | 1.5...2.0°C |
Delay |
On delay after defrosting | 3-5 minutes |
⚠️ Attention: Do not set the hysteresis too narrow (less than 1°C). This will lead to frequent on-off cycles of the compressor, which will sharply reduce its resource.
How to enter the service menu?
To enter the parameters menu, you usually need to hold down the "Set" button for 5-7 seconds until the inscription "P0" or "F0" appears. Next, short presses select the parameter, and long presses change the value. Be careful: changing unknown parameters may disrupt the factory calibration of the sensors.
If the display case is intended for different groups of goods, configure the zones. In combined cabinets, the top shelf may be warmer than the bottom. Use baffles or adjust duct dampers if the design allows. Humidity is critical for confectionery display cases, so the temperature should not be lowered below +4...+6°C so that the creams do not freeze.
Setting up an automatic defrosting system
The most common cause of breakdown is ignoring the defrosting mode. The ice on the evaporator acts as a heat insulator, which is why the compressor works non-stop, trying to cool the chamber, but failing. Setting defrost cycles depends on the humidity in the room and the frequency of opening the doors.
There are two main types of defrost: electric (heating element) and hot gas. Electric is easier to set up, but consumes more energy. The defrosting interval parameter defrost interval (Idt) is usually set in hours (for example, every 6 or 8 hours). The duration of defrosting itself (Mdt) should be sufficient for complete melting of the ice, but not excessive.
- ❄️ For rooms with high humidity, reduce the interval between defrosting to 4-5 hours.
- ⏱️ Defrosting time is usually 15-20 minutes, but it is better to focus on the defrost sensor (if yes).
- 💧 Be sure to check the drainage system: water should flow freely without forming puddles under the display case.
If you notice that after defrosting the temperature in the chamber jumps sharply, increase the delay time for turning on the fans. They should not start blowing until the last of the water drips from the evaporator. Otherwise, you will receive warm, humid air, which will quickly create new ice.
Diagnostics of typical errors and fault codes
Modern controllers are equipped with a self-diagnosis system. If there is a failure, an error code appears on the display. Understanding these codes allows you to quickly fix the problem without calling a technician. Most often, errors are associated with temperature sensors or compressor problems.
Let's consider common codes found on controllers Eliwell and analogues:
E1 — Malfunction of the evaporator temperature sensor. Check the integrity of the wire and contact.
E2 — Malfunction of the air sensor in the chamber. The sensor needs to be replaced.
AL — Alarm (high temperature). Occurs if the temperature in the chamber does not drop for a long time.
⚠️ Attention: If an error code related to high pressure or compressor current flashes on the display, immediately unplug it. Further work may lead to burnout of the motor winding.
It is also worth paying attention to the condition of the door seals. If the elastic does not fit tightly, warm, moist air constantly enters the chamber. This causes the compressor to run continuously and cause frequent high temperature errors. Replace the seal or adjust the hinges if you notice gaps.
Seasonal adjustment and maintenance
Settings, ideal for winter, may not be suitable for summer. During the hot season, the load on the capacitor increases many times. It may be necessary to increase the frequency of defrost cycles or lower the target temperature by 0.5-1 degrees to compensate for heat gain.
Regular maintenance includes more than just cleaning the shelves. At least once a quarter it is necessary to clean the condenser from dust. A radiator clogged with dust is the main cause of overheating and high pressure in the system. Use a soft brush or a vacuum cleaner with a narrow attachment.
Check the tension of the fan belts (if any) and the absence of play in the bearings. Timely lubrication and replacement of worn parts will cost less than replacing the entire unit. Remember that commercial equipment is designed to operate 24/7, but only if properly maintained.
In conclusion, proper display setup is a balance between temperature, humidity and energy efficiency. Monitor the instrument readings, do not ignore the controller signals and carry out preventive maintenance, and your equipment will last for many years.
Frequently asked questions (FAQ)
Why does the display case hum or make strange sounds after setting up?
Extraneous noise can be caused by several reasons: vibration of the tubes casing, fan malfunction or compressor operation in overload mode. Check whether the display case is level and that there are no foreign objects near the radiator grille. If a humming noise appears after defrosting, it may be the sound of dripping water, which is normal.
How often do you need to perform a complete defrosting manually?
With a working automatic defrosting system (AUT), manual defrosting is rarely required, usually 1-2 times a year for sanitary treatment. If you see that the “fur coat” is growing faster than the defrost cycle, it means that the system is configured incorrectly or is faulty, and specialist intervention is required.
Can a display case be used in an unheated room in winter?
Most standard display cases are designed to operate at ambient temperatures from +16°C to +32°C. At lower temperatures, the oil in the compressor thickens, which leads to its breakdown during startup. For unheated premises, models with a low-temperature set (winter package) are required.
What to do if the display case does not maintain the temperature when fully loaded?
This may indicate insufficient power of the equipment for the given volume of products or a violation of air circulation. Make sure products do not block air ducts or vents. Also check the integrity of the door seals.