Owners of commercial and household equipment are often faced with the need to accurately calibrate temperature conditions after purchasing or changing operating conditions. Polair refrigerator requires careful attention to the operating parameters of the controller, since the safety of products and the energy efficiency of the device depend on this. Incorrect setting can lead to damage to the product or increased wear of the compressor.
In this guide we will analyze the algorithms of actions for various models of controllers used in the equipment of this brand. You'll learn how to interpret display readings, change settings, and troubleshoot common automation problems. Correct initialization of parameters is the key to long service life of your equipment.
Interface and control of the controller
The main element of user interaction with the equipment is digital controllerlocated on the front panel of the case. Depending on the year of manufacture and series (for example, Polair DM or older models), the appearance of the panel may differ, but the logic of operation remains similar. The display shows the current temperature inside the chamber, as well as the operating status of the compressor and evaporator.
To change settings, function buttons are used, each of which has its own purpose. The on/off button is usually combined with the defrost function, and the arrow buttons allow you to change parameter values. It is important to know that entering the settings menu often requires a long press (about 3-5 seconds) on the “Set” button or key combination. Without this action, you will only see the current temperature mode.
Light indication plays a key role in diagnostics. If the green indicator is on, it means the equipment is operating normally. A flashing red light or symbols appearing on the screen indicate the need for intervention. Some models Evco series controllers or Dixell have hidden menus that are accessible only to service engineers, but basic settings are open to the user.
When you turn it on for the first time after transportation, you should not immediately set extremely low temperatures. Allow the compressor oil to drain into the crankcase if the unit is standing horizontally. This will prevent water hammer and failure of the piston group.
Temperature adjustment algorithm
The process of adjusting the temperature regime depends on the type of installed automation. For standard models, the procedure is as follows. First you need to make sure that the refrigerator is connected to the network and is in working condition.
⚠️ Attention: Before starting the setup, make sure that the door is tightly closed and there are no foreign objects inside the chamber that block the air circulation. Sensors may read incorrect data if ventilation is poor.
To change the target temperature, follow these steps:
- 🔹 Press and hold the Set button (usually labeled "Set" or represented by a gear) for 3 seconds until the indicator light flashes.
- 🔹 Use the "Up" buttons and “Down” to select the desired temperature value.
- 🔹 Press the confirmation button (“Set” or “Enter”) to save the parameter.
- 🔹 Wait until you exit the settings menu - the device will automatically return to the current temperature display mode.
If you are using a model with dual-range adjustment, it is important to understand the difference between the compressor switch-on and switch-off temperatures. The difference (differential) is usually 2-4 degrees. For example, when setting +4°C, the compressor will turn off when this value is reached and turn on again when the temperature rises to +6°C or +8°C, depending on the hysteresis settings.
☑️ Check before setting
In some cases, access to the advanced menu is required. To do this, you may need to enter a password or use a key combination described in the technical documentation for a specific model Polair Professional. Do not change the factory hysteresis settings unless absolutely necessary, as this may lead to frequent engine starts.
Operating modes and special functions
Modern Polair refrigerators are equipped with several operating modes that optimize energy consumption and storage conditions. Switching between them is carried out through the menu or separate buttons on the control panel.
The main one is cooling mode, which is activated automatically when the device is turned on. In this state, the controller maintains the set temperature by periodically starting the compressor. If the chamber becomes too cold, protection is activated and the engine stops until the temperature rises.
Also available defrost mode. In automatic systems, it is activated by a timer or compressor hour meter. In manual mode, the user must initiate defrosting by pressing the appropriate button. During this process, the temperature in the chamber may briefly increase, which is normal for removing ice from the evaporator.
What is “Night mode”?
Night mode (or energy saving mode) reduces the speed of the fans and may slightly increase the permissible temperature range at night when the door is opened less often. This reduces noise and energy consumption.
The function alarm signaldeserves special attention. If the door remains open longer than the set time (usually 3-5 minutes), an audible alarm will sound and the corresponding code or flashing symbol will appear on the display. This helps prevent food from defrosting and loss of cold.
Deciphering error and fault codes
The refrigerator electronics constantly monitor the state of the system. When anomalies are detected, error codes appear on the display to help diagnose the problem. Knowing these codes allows you to quickly react and avoid cargo damage.
Below is a table of the most common errors found in Polair equipment:
| Error code | Problem description | Recommended action |
|---|---|---|
E1 |
Faulty evaporator temperature sensor | Check the sensor connection, replace if necessary |
E2 |
Faulty temperature sensor in the chamber | Measure the sensor resistance, replace if broken |
E3 |
High temperature in the chamber (Alarm) | Check the tightness of the door closure, loading of products |
dF |
Defrost mode (Defrost) | Normal state, waiting for the end of the cycle |
When the code appears E1 or E2 the controller often goes into emergency mode, starting the compressor according to a temporary algorithm in order to somehow maintain the cold. However, you cannot rely on this for a long time - the sensor element must be replaced.
⚠️ Attention: If an error code flashes on the display, do not try to reset it by repeatedly unplugging it without eliminating the cause. This can cause moisture to accumulate inside the electronics due to condensation.
To reset the error after troubleshooting, it is sometimes necessary to manually reboot the controller or enter the menu and select Alarm Reset. In some models, the error disappears on its own after several successful cooling cycles.
Maintenance and calibration
Regular maintenance extends the life of the equipment. In addition to setting the temperature, it is important to monitor the cleanliness of the condenser and the condition of the door seals. Dust on the radiator causes the compressor to work longer, which throws off the temperature settings.
It is recommended to do this once every six months sensor calibrationif you notice a discrepancy between the display reading and the actual thermometer placed inside the camera. To do this, there is an offset parameter in the service menu. For example, if the refrigerator shows +2°C, and the real thermometer shows +4°C, you need to make a +2 degree correction in the controller settings.
Checking the seals is also critical. If the rubber has lost its elasticity or is dirty, the cold will disappear and setting the temperature will become useless - the compressor will work for wear, trying to achieve the set parameters. Wipe the seals with a soft cloth and check their fit using the “sheet test” method.
Do not forget about defrosting if your model does not fully support the automatic system. The build-up of ice on the evaporator impairs heat transfer, and the temperature sensor may “think” that the chamber is already cold, although the food freezes unevenly. No Frost fully. The accumulation of ice on the evaporator impairs heat transfer, and the temperature sensor may “think” that the chamber is already cold, although the food freezes unevenly.
Frequently asked questions and problem solving
Users often encounter a situation where the refrigerator hums, but does not get cold, or the temperature “jumps.” In most cases, this can be solved by reconfiguring or simple prevention. If after setting the parameters do not hold, there may be a refrigerant leak or a malfunction of the thermostat.
Sometimes the problem lies in the installation location of the equipment. Direct sunlight or the proximity of heating devices heats up the housing, forcing the automation to work in extreme mode. In such conditions, even a working refrigerator may not be able to cope with the load.
If you plan to use the refrigerator to store specific products (for example, medicines or flowers), temperature requirements may differ from standard ones. In this case, it is better to entrust the setting to a specialist who will select the optimal differential.
Why does the Polair refrigerator not turn off?
Continuous operation of the compressor can be caused by several reasons: incorrect temperature setting (too low), a door not closed tightly, condenser contamination, freon leakage or a malfunction of the temperature sensor. Check the settings and cleanliness of the radiator first.
How to defrost a Polair refrigerator correctly?
Unplug the appliance, open the door and remove the food. Wait until the ice has completely melted. Do not use sharp objects or a hair dryer to speed up the process - this may damage the evaporator. After defrosting, wipe the chamber dry before turning it on.
What does a flashing light on the panel mean?
A flashing light most often indicates a high temperature alarm (Alarm). This means that the inside of the camera is warmer than set in the settings. Check whether the door is tightly closed and whether you have loaded warm products.
Can you change the controller settings yourself?
The basic temperature settings can and should be changed. However, changing hysteresis parameters, sensor types or factory constants in the service menu without special knowledge is not recommended - this may disrupt the operation algorithms of the equipment.