Professional refrigeration equipment of the brand Polair is deservedly in high demand among catering establishments and retail trade due to its reliability and energy efficiency. However, even the highest quality equipment requires proper initial setup to ensure the correct temperature conditions inside the chamber. Incorrect adjustment can lead to spoilage of products or, conversely, to excessive energy consumption and freezing of the evaporator.
Owners of single-door models are often faced with the need to change factory settings, especially if the equipment is moved from one room to another or the assortment of stored goods changes. Understanding the principles of operation thermostat and knowledge of error codes allows you to avoid calling a wizard for simple operations. In this article, we will analyze in detail the setup process, the features of different types of control and methods for diagnosing possible malfunctions.
Before proceeding with the adjustment, you must make sure that the equipment is completely defrosted, clean and connected to an electrical network with a voltage corresponding to the technical data sheet. The stability of the compressor directly depends on the quality of the power supply and environmental conditions. Only after these conditions have been met can you proceed to fine tuning microclimate inside the chamber.
Principle of operation of the Polair cooling system
Single-door refrigerators Polair usually equipped with static or dynamic cooling system, where the refrigerant circulates in a closed circuit. The key control element here is the electronic controller, which reads the temperature sensors and makes a decision to turn it on or off. Unlike household analogues, industrial models have a wider range of operating temperatures and enhanced insulation. compressor. Unlike household analogues, industrial models have a wider operating temperature range and enhanced insulation.
The main task of the user is to set the correct setting at which the products will be stored for as long as possible without losing their qualities. For medium-temperature chambers, the optimal range is considered to be from +2 to +6 degrees Celsius. If you set the value too low, the compressor will work almost non-stop, which will lead to premature wear and freezing of the “fur coat” on the evaporator.
⚠️ Attention: A sharp change in temperature setpoints by more than 3-4 degrees at a time can cause stress for the compressor group. Change the parameters smoothly, giving the system time to stabilize the mode.
The control system also takes into account the ambient temperature. If the refrigerator is in a hot shop or in direct sunlight, the sensors will detect increased load. In such cases, standard settings may not be effective enough, and you will need to adjust the operating parameters fan or compressor operating time.
Types of thermostats in Polair equipment
Depending on the year of manufacture and series of equipment, different types of control units can be used in single-door refrigerators. The most common are controllers Eliwell (series EW961, EW962) and Dixell, as well as the plant's own developments Polair labeled DM or MM. Each of them has its own interface and logic for interacting with the user
Mechanical thermostats, found in older or budget models, are a rotary knob with a digital or color scale designation. There is no digital display, and adjustments are made “by eye” or using an external thermometer placed inside the camera. Digital controllers, in turn, allow you to set precise values in 0.1 degree steps and display the current state of the system in real time.
To determine the type of your controller, just look at the front panel. If there is a digital display and menu buttons, you have an electronic system. If only a rotating handle with marks is visible, it is mechanical. Modern models are increasingly equipped with advanced microprocessorsthat support remote monitoring and self-diagnosis.
- 🔹 Eliwell EW961 —a basic model with a minimal set of functions, ideal for simple storage tasks.
- 🔹 Dixell XR20CX —extended functionality, support for time defrosting and temperature.
- 🔹 Polair DM - specialized controllers with an adapted menu for the equipment of a given brand.
Understanding which controller is installed in your refrigerator is critical for correct settings. Instructions for different models may differ significantly in the location of the buttons and the sequence of actions. Do not try to apply the instructions from Dixell to a mechanical regulator, this may lead to confusion and incorrect settings.
Setting the mechanical thermostat
If your single-door refrigerator Polair equipped mechanical regulator, the adjustment process comes down to empirical selection of the position of the handle. Typically the scale is designated from 1 (minimum cooling) to 7 (maximum cooling) or color sectors. The factory setting is usually in the middle position, which is suitable for most standard operating conditions.
For precise adjustment, you will need a separate thermometer, which must be placed in the center of the chamber, preferably in a container of water, to simulate the temperature of the product. After changing the position of the handle, you must wait several hours until the temperature stabilizes. Only after this can readings be taken and a decision made on further adjustments.
This means that the temperature inside the chamber will fluctuate within a certain range. Your task is to adjust the average value of this range so that it falls within the required sanitary standards.
☑️ Checking the mechanical settings
If the temperature in the room where the refrigerator is located changes (for example, it is colder in winter than in summer), the position of the mechanical regulator handle may require seasonal adjustment. In the summer, when the workshop is hot, the handle often has to be turned towards greater cooling in order to compensate for heat inflows through the walls of the chamber.
Instructions for Eliwell and Dixell electronic controllers
Setting up digital controllers requires following a certain sequence of actions, since they are protected from accidental changes in parameters. To enter the user menu, you usually need to briefly press a certain combination of buttons. In controllers Eliwell this is often the “Set” button, and in Dixell it is the “Set” button or a key combination.
After entering the editing mode, the current setting value will begin to flash on the display. Using the Up and Down arrow buttons, set the desired temperature. press “Set” to save or simply wait a few seconds until the controller automatically exits the setup mode and saves the changes.
There is also a hidden parameter menu, accessible only to technicians, where you can configure the compressor turn-on delta, defrost intervals and protection against frequent starts. It is strictly not recommended for an ordinary user to change these parameters It is strictly not recommendedas this may disrupt the operation algorithms of the equipment.
⚠️ Attention: In the event of a power failure, electronic controllers Polair usually save the settings in non-volatile memory. However, after switching on, it may take several minutes for the compressor to start (protection delay).
If the “DEF” symbol or a similar indicator lights up on the display, this means that the evaporator is defrosting. At this point, the temperature in the chamber may rise briefly, which is a normal operating process and not a malfunction.
Table of optimal temperature conditions
The choice of the correct temperature depends on the type of food you plan to store. There is no universal value for all cases, so it is important to focus on the recommendations of sanitary standards and technological maps of your enterprise.
| Type of products | Recommended temperature (°C) | Permissible range | Storage features |
|---|---|---|---|
| Vegetables and fruits | +4.. +6 | +2.. +8 | Require high humidity, avoid freezing |
| Dairy products | +2.. +4 | +1.. +6 | Compliance with the regime is critical, they spoil quickly |
| Semi-finished meat products | +1.. +3 | 0.. +4 | Strict control is needed to minimize storage time |
| Ready meals | +2.. +5 | +1.. +6 | Store in a closed container, avoid proximity to raw meat |
| Drinks | +3.. +6 | +2.. +8 | Less demanding on accuracy, the main thing is not freeze |
Using this table will help you set the initial settings, which can then be adjusted depending on the actual load of the camera and the frequency of door opening. Remember that fully loading the chamber with food requires more intensive work of the compressor in the initial phase.
The influence of loading on temperature
An empty refrigerator cools down faster, but also heats up faster when the door is opened. A full load stabilizes the temperature, but requires more time for initial cooling.
Diagnostics and error codes
Modern refrigerators Polair are equipped with a self-diagnosis system that displays error codes on the controller display if faults are detected. The most common code is E1 or P1, which indicates an error in the temperature sensor inside the chamber. This may indicate an open circuit or short circuit.
If you see a flashing display or code HA (High Alarm), this indicates that the permissible temperature threshold has been exceeded. The equipment warns you that food may spoil. First of all, check that the door is tightly closed, that the seals are not stuck and that the fan is working.
Code LA (Low Alarm), on the contrary, indicates that the temperature is too low, which can lead to freezing of food that is not intended for freezing. Often this is a consequence of sticking relay contacts or failure of the thermostat, which does not give the command to turn off the compressor.
- 🔸
E1/E2— Malfunction of the temperature sensor (replacement required). - 🔸
COMP— Problems with the compressor or start relay. - 🔸
FAN— Malfunction of the fan motor evaporator.
If any error code appears, it is recommended to record it and contact service if simple elimination methods (reboot, power check) did not help. Ignoring the diagnostic system signals can lead to more serious breakdowns and loss of inventory.
Frequent problems during setup and their solution
One One of the most common problems is the situation when the refrigerator does not reach the set temperature. Often the reason lies not in a malfunction, but in improper operation: products are loaded in such a way that they block the flow of cold air, or the door remains ajar. It is also worth checking whether the equipment is too close to the wall, which interferes with heat dissipation.
The other extreme is the constant formation of ice on the back wall or evaporator. This may indicate that the temperature is set too low, or the defrosting cycle is disrupted. In some cases, manual defrosting is required: turn off the refrigerator, open the door and wait for the ice to completely melt.
Noisy operation or vibration after setting may be caused by the fact that the equipment is standing on an uneven surface. Adjust the support legs so that the refrigerator is level. This will not only reduce noise, but also ensure proper flow of oil in the compressor.
⚠️ Attention: If after defrosting and re-adjusting the temperature does not stabilize within 6-8 hours, there is likely a refrigerant leak or a compressor malfunction. A specialist call is required.
Do not forget that operating conditions may change. In summer, when the ambient temperature is high, the refrigerator will work harder. In winter, if the room is not heated, the equipment may not turn on at all, since the sensors will assume that it is already cold inside. To work in cold rooms, special models with tropical version or heated compressor crankcase are required.
Why does the Polair refrigerator not keep the temperature after setting?
There may be several reasons: a malfunction of the door seal (let heat through), failure thermostat (does not see the real temperature), freon leak or condenser contamination, which reduces the efficiency of heat exchange. Also check if the refrigerator is not loaded with warm food.
How often do you need to defrost a single-door refrigerator?
Models with the NoFrost system do not require manual defrosting; it is enough to wash the chamber 1-2 times a year. Models with static cooling (drip cooling) require defrosting as ice forms, but at least once every 3-6 months, depending on the humidity of the food and the frequency of opening the door.
Is it possible to transport a Polair refrigerator lying down?
It is strictly not recommended to transport professional refrigeration equipment lying down. This can cause oil to leak into the refrigerant circuit and cause compressor failure. If transportation lying down is unavoidable, after installation the equipment must stand upright without being turned on for at least 24 hours.
What to do if the red alarm light is on?
The red indicator usually signals an increase in temperature above a critical level. Check if the door is closed, if the ventilation is working, if the network is overloaded. If after 30-40 minutes of operation in normal mode the light does not go out, the cooling system may need to be repaired.