Correct adjustment of climate parameters in commercial or industrial equipment is a fundamental task on which the safety of products and the economic efficiency of the business depend. Refrigerators Polair, being one of the most common on the CIS market, offer flexible control tools, but their interface may seem complicated for an untrained user. Incorrect setting of values often leads to damage to goods or excessive energy consumption.
Equipment owners need to understand the difference between cooling and freezing modes, and also be able to read readings from the electronic controller. In this article, we will analyze in detail the algorithms of action for various models, explain the meaning of the indicators and help avoid typical mistakes during the initial startup or reconfiguration of the system.
The correctly set temperature guarantees compliance with sanitary standards and rules HASCP series, which is critical for passing inspections and consumer safety. We will look at both mechanical thermostats in older models and modern digital microprocessors of the DM i MM.
Features of the Polair refrigerator control system
Modern refrigeration cabinets and chambers of the brand are equipped with microprocessor controllers that automatically maintain a given range. The main control element is a digital display that displays the current temperature inside the chamber, and a panel with buttons for entering parameters. In older or budget models, there may be a mechanical regulator that operates on the principle of a thermostat.
The key difference between digital systems is the possibility of precise calibration and the presence of an auto-defrost function. The controller reads data from the sensors and turns on the compressor only when the temperature rises above the set threshold. This can significantly reduce equipment wear. It is important to distinguish between two main types of controllers often used by the manufacturer:
- 🔹 DM series controllers — designed primarily for medium-temperature cabinets (0..+10°C) and have a simplified interface.
- 🔹 MM series controllers —used in low-temperature freezers (-18..-24°C) and have advanced functionality.
- 🔹 Universal panels —can be found in combined models, allowing you to switch between modes.
⚠️ Attention: The controller interface may vary slightly depending on the year of manufacture of the equipment. If the location of the buttons does not match the description, refer to the datasheet of the specific model, since the manufacturer reserves the right to upgrade the electronic components without changing the appearance of the case.
Understanding the logic of the system helps to respond faster to emergency situations. For example, if you see a flashing light, it doesn't always mean it's broken. Often this is a signal that an active defrosting process is in progress or that the door has been open for too long. Microprocessor analyzes the thermal load in real time and adjusts the operation of the compressor.
Algorithm for setting the temperature on a digital controller
Process Changing settings on a digital display requires sequential actions. It is not recommended to press buttons randomly, as this may lead to accidental entry into the service menu or resetting settings. The standard procedure for most models is as follows:
First you need to activate the editing mode. This usually requires briefly pressing the button with the settings icon (often indicated as Set or the image of a thermometer). The display will begin to flash the current temperature value, indicating that it is ready to enter new data.
Using the Up and Down arrow buttons, select the required value. After completing your selection, you need to confirm the action by pressing the install button again or simply waiting a few seconds until the system accepts the changes automatically. To record the result, it is important to observe the timing.
☑️ Check after setting
It is worth noting that temperature change is not an instantaneous process. After entering new parameters, the refrigeration unit will need time (from 30 minutes to several hours) to reach the new operating mode. During this period, the compressor may turn on more frequently.
Setting the mechanical thermostat
In models of previous generations or in certain series of cabinets, there may be no electronic display. Instead, a mechanical thermostat is used, which is a rotary switch with graduation from 1 to 5 or from Min to Max. The principle of operation here is based on the physical expansion of the sensitive element.
The temperature setting in such devices is done empirically, since the exact degrees are not indicated on the scale. Position “1” or Min corresponds to the lowest cooling intensity (higher temperature inside), and position "5" or Max corresponds to the maximum compressor power.
For precise adjustments, it is recommended to use an external thermometer placed inside the chamber. By turning the regulator knob, you need to wait until the temperature stabilizes (usually 3-4 hours) and fix the position at which the required range is achieved. This is especially true when changing seasons or the type of product being loaded.
Mechanical systems are less accurate, but more reliable under unstable voltage conditions. However, they do not have an automatic defrosting function in the classical sense, so control over the formation of ice falls on the shoulders of the staff. Regularly checking the readings of an external thermometer will help avoid defrosting of products.
Table of recommended temperature conditions
The choice of the correct temperature directly depends on the type of stored product. Violation of the temperature regime can lead not only to damage to the goods, but also to the proliferation of pathogenic microorganisms. Below is a reference table for different product groups.
| Product Type | Recommended Range (°C) | Max. shelf life | Features |
|---|---|---|---|
| Vegetables and fruits | +2.. +6 | 3-10 days | Require high humidity |
| Dairy products | +2.. +4 | 2-5 days | Strict control +4°C |
| Semi-finished meat products | 0.. +4 | 1-3 days | Do not allow freezing |
| Frozen foods | -18.. -24 | up to 12 months | Only for freezers |
| Ready cooking | +2.. +6 | 24-48 hours | Required in a container |
When storing mixed groups of products, you should focus on the requirements of the most sensitive product. For example, if milk and vegetables are stored in the same cabinet, the temperature should be set closer to +2..+4°C to ensure the safety of dairy products.
At the back wall, where evaporatoris located, it is always colder than at the door. Place products taking into account this feature, without pressing them close to the back wall to avoid freezing.
Deciphering indicators and error codes
The electronic control system not only regulates the cold, but also diagnoses malfunctions. When problems occur, specific codes or flashing symbols may appear on the display. Ignoring these signals can lead to serious damage.
The most common signal is a flashing temperature indicator or icon AL (Alarm). This indicates that the permissible temperature threshold inside the chamber has been exceeded. The reasons may be trivial: a door that is not tightly closed, loading warm products, or a power failure.
- 🔸 Code E1 - error in the temperature sensor inside the chamber (break or short circuit).
- 🔸 Code E2 —malfunction of the evaporator temperature sensor.
- 🔸 Code E3 —communication error between the controller and the control panel.
⚠️ Attention: If there is an error code on the display, trying to reset it by simply turning off the power may not help. It is necessary to eliminate the physical cause (for example, replace the sensor), otherwise the system will go into error again after several operating cycles.
You should also pay attention to the defrost indicator. In models with a No Frost or drip defrost system, this process occurs automatically. If the indicator is constantly on, the defrost heating element or defrost sensor may be faulty, which requires specialist intervention.
Frequent problems when setting the temperature and their solutions
Users often encounter a situation where the set temperature is not reached or, conversely, food freezes in the refrigerator compartment. One of the common reasons is the incorrect location of the temperature sensor or its contamination. Dust and ice on the sensor distort the readings, causing the compressor to run idle.
Another problem is frequent opening of doors in a hot room. If the sales area is +28°C and the cabinet door is opened every 5 minutes, the system may not be able to cope with the heat gain. In such cases, it is recommended to temporarily reduce the setpoint by 1-2 degrees or limit personnel access.
Why does the temperature fluctuate?
Sharp changes in indicators (for example, from +2 to +8 and back) often indicate sticking relay contacts or a malfunction of the control board. Also, the cause may be a refrigerant leak when the compressor runs constantly but does not gain cold.
If you notice that condensation (“sweat”) appears on the food, this is a sure sign that the temperature inside is higher than necessary or the air circulation is impaired. Check that the ventilation holes inside the chamber are not clogged and that the fan is working.
If standard adjustment methods do not help stabilize the mode, it may be necessary to calibrate the sensors or replace the refrigerant. Do not try to open the refrigeration circuit yourself - this requires a license and special equipment.
Prevention and maintenance for stable operation
In order for the set temperature to remain stable over many years, regular maintenance is necessary. A dirty condenser (grid at the back or bottom) drastically reduces the efficiency of heat transfer, causing the compressor to wear out.
Regularly, at least once a quarter, check the integrity of the door seals. If the rubber is cracked or has lost its elasticity, the cold will escape and warm air will enter. This will lead to the system constantly trying to compensate for losses, which will increase your electricity bills.
It is also important to keep the drainage holes clean. A clogged condensate drain can lead to the formation of an ice plug, which will disrupt the operation of the defrost system and change the temperature in the chamber. Clean the channels with a soft brush or warm water.
Following simple operating rules and timely replacement of consumables will allow your equipment to data-i="144">serve for many years without expensive repairs. Remember that proper settings are only the first step to maintaining the quality of your food. Polair serve for many years without expensive repairs. Remember that proper setup is just the first step to maintaining the quality of your products.
Can food be stored at higher temperatures than recommended if you turn on the fan?
No, turning on an additional fan will not compensate for insufficient cooling. This will only mix the warm air, but will not cool it. Products can deteriorate, since bacterial activity depends precisely on the degrees, and not on air movement.
What to do if, after setting, the temperature drops too low?
It is urgent to increase the setpoint on the controller. If this does not help, the compressor start relay may be stuck or the thermostat may be faulty. In this case, the products must be transferred, and the equipment must be disconnected from the network until the technician arrives.
How often should you check the thermometer readings in the cabinet?
According to food production standards, temperature control should be carried out at least twice a day and recorded in a log. For digital equipment, it is recommended to weekly check the display readings with the readings of a verified reference thermometer.
Does filling the refrigerator affect the cooling rate?
Yes, a completely empty refrigerator cools faster, but holds the temperature worse when the door is opened. Products work as cold accumulators. The optimal load is about 70-80% of the volume so that air can circulate between the shelves.