Professional refrigeration equipment of the Polair brand is deservedly popular in the small and medium-sized business segment. Single-door models, be it cabinets of the DH, ShH series or more modern versions with digital control, require proper initial setup to ensure a stable temperature regime inside the chamber. The correct configuration of the controller is not just a formality, but a necessary condition for the safety of products and the long service life of the compressor-condensing unit.
Many users encounter difficulties during the first start-up, when the indicators on the panel flash and the temperature does not meet expectations. This is often due to the fact that the factory settings may not take into account the specific workload of the chamber or the temperature conditions of the room where the equipment is installed. In this material, we will analyze the algorithms for setting up the most common controllers used in Polair single-door refrigerators and eliminate typical operating errors.
Before you begin adjusting the parameters, you need to make sure that the equipment is connected to the electrical network in compliance with all safety standards and has been acclimatized after transportation. Temperature stability directly depends on the correct operation of the thermostat and the correct sensor locations. Ignoring basic installation rules can negate all attempts to fine-tune the electronics.
Preparing the equipment for the first start
The initial setup of the Polair refrigerator begins long before you press the first button on the control panel. A critically important step is correct installation and fixation temperature sensors. Single-door models usually use one or two sensors: one measures the air temperature in the chamber, the second (optional) controls the temperature of the evaporator or product. If the air sensor hangs freely by the door or touches the wall, the readings will be incorrect, which will lead to frequent starts of the compressor.
After placing the equipment in the room where it will be operated, you must wait a certain time before connecting it to the network. This is required to stabilize the oil in the compressor, especially if transportation was carried out at low temperatures. Typically, the manufacturer recommends exposure from 2 to 4 hours, but it is better to check the exact time in the passport of the specific model Polair.
⚠️ Attention: It is strictly forbidden to turn on the refrigerator immediately after horizontal transportation without first holding it in a vertical position. This can lead to water hammer in the compressor and equipment failure.
Visually inspect the door seals of the single-door cabinet. They should fit snugly around the entire perimeter. If the door is warped or the seal is damaged, it will be impossible to set a stable temperature, since the cold will constantly evaporate and the compressor will work without interruption. Make sure that the ventilation grilles, if provided by the design, are not blocked by foreign objects.
☑️ Check before switching on
Controller interface and controls
Most single-door refrigerators Polair are equipped with electronic controllers, which may vary in appearance and functionality. The most common models are series controllers Evco or the manufacturer’s own developments with marking Micro-60 and their modifications. The control panel typically contains a digital display showing the current temperature and several function buttons.
The main button, often labeled "Set" or having an image of a thermometer, is used to enter the settings menu and confirm changes. The Up and Down arrow buttons allow you to change parameter values or move between menus. Some models have a separate on/off or defrost button. Understanding the purpose of each key is the key to successful equipment calibration.
Various symbols may appear on the display to indicate the status of the system. Flashing numbers often indicate a transient or alarm. The illuminated compressor indicator indicates its current operation, and the defrost indicator is activated during defrost cycles. It is important to distinguish between the mode for displaying the current temperature and the mode for setting the setpoints.
If the display shows an error code instead of a temperature (for example, E1, E2), this indicates a sensor or system malfunction. In this case, setting the temperature mode is impossible until the hardware problem is resolved. Error codes are usually deciphered in the instructions, but most often E1 means a sensor break, and E2 means a short circuit.
Algorithm for setting the temperature in the chamber
The process of setting the desired temperature in a Polair single-door refrigerator is standardized for most models, but there may be nuances depending on the controller firmware version. To enter the parameter setting mode, you must press and hold the "Set" button for 3-5 seconds until the value starts flashing on the display or the parameter code appears (usually SP or SET). This action puts the controller into editing mode temperature settings.
Using the navigation buttons, set the required value. For refrigerated cabinets, the optimal range is considered to be from +2 to +6 degrees Celsius. If you are storing specific foods that require lower temperatures, the value can be reduced, but you should not set it below 0 unless it is a freezer to avoid freezing the contents. After selecting the value, press "Set" to save.
It is worth noting the difference between the set temperature and the actual one. After changing the settings, the compressor will not start working immediately if the current temperature in the chamber has not yet reached the switching threshold. There is a concept hysteresis (differential) that determines how many degrees the temperature must rise above the set point for the compressor to turn on again.
The table below shows typical parameters for various storage modes, which can be used as a starting point when setting up your Polair:
| Type product | Recommended temperature (°C) | Acceptable range | Storage features |
|---|---|---|---|
| Semi-finished meat products | +2... +4 | 0... +5 | Requires a stable mode without surges |
| Dairy products | +2... +6 | +1... +7 | Freezing is unacceptable |
| Vegetables and fruits | +5... +8 | +3... +10 | High humidity is needed |
| Ready cooking | +2... +6 | +1... +7 | Short-term storage |
After setting the parameters, wait until the equipment enters the mode. This process can take from 2 to 6 hours depending on the initial room temperature and chamber load. Do not open the door frequently during this period, so as not to disrupt the process cold gain.
Adjusting defrosting and ventilation cycles
Polair single-door refrigerators, like any equipment with air-cooled evaporators, periodically accumulate frost on the heat exchanger. Automatic defrosting is used to remove ice. Setting the intervals and duration of this process is critical: too infrequent defrosting will lead to the evaporator becoming clogged with ice and loss of cooling capacity, and too frequent defrosting will lead to an increase in the temperature in the chamber.
In the controller menu, parameters are usually available that are responsible for the interval between defrosts (Idr) and the maximum duration of the process (Mdr). The standard interval is 6 hours, but in conditions of high humidity or frequent door openings this can be reduced to 4 hours. The duration is usually set between 20-30 minutes. If the evaporator does not have time to defrost in the allotted time, the cycle is interrupted by a timer, which may not be sufficient.
⚠️ Attention: Do not set the defrosting interval to less than 2 hours. This will lead to the fact that the temperature in the chamber will not have time to drop to operating values, which is dangerous for stored products.
The parameter for turning on the fan after defrosting deserves special attention. To prevent residual moisture from the evaporator from entering the chamber, the fan is often not turned on immediately after the heating element has finished heating. The fan switch-on delay is adjusted (parameter FdF or similar). The optimal value is 2-3 minutes, which allows condensation to drain into the drain pan.
What happens if you turn off automatic defrosting?
When you forcefully turn off the defrosting function, a coat of ice will begin to build up on the evaporator. After 2-3 days this will completely block the air flow. The compressor will run continuously, trying to cool the chamber, but the temperature will begin to rise. As a result, overheating and combustion of the compressor or failure of the defrosting heating element is possible.
Diagnostics and decoding of alarm signals
The electronics of the Polair refrigerator constantly monitors the state of the system. When parameters go beyond acceptable limits or faults are detected, the controller goes into alarm mode. This may be an audible buzzer (if provided by the design) or a blinking indicator on the display. Ignoring these alarms may result in product damage.
The most common alarm is the high temperature alarm. It is activated if the temperature in the chamber rises above a set threshold (HAL parameter) for a certain time. This can happen after loading warm food or if the compressor breaks down. There is also a low temperature alarm, which is important to prevent food from freezing if the thermostat malfunctions.
Often users confuse the alarm with the "Protection" mode. If, after a power outage, the refrigerator turns on, but the compressor does not start, and the indicator flashes on the display, it works compressor protection from frequent switching on. You just need to wait 3-5 minutes until the timer allows starting.
If error codes such as “P1”,”P2” or “E1” appear, you should refer to the technical documentation. Often these codes indicate problems with sensors:
- 🔴 Open circuit of the sensor - the signal is interrupted, the controller sees resistance tending to infinity.
- 🔴 Short circuit of the sensor - the resistance drops to zero, which also blocks operation.
- 🔴 Board malfunction control is a rare case that requires replacement of the controller.
Frequent problems and their solutions during setup
Even if all instructions are followed, users may encounter non-standard behavior of the equipment. For example, the refrigerator does not “hold” the set temperature. Before calling a technician, check the tightness of the door and the cleanliness of the condenser (radiator), which is often located on the back wall or at the bottom of the cabinet. Dustiness of the condenser sharply reduces the efficiency of heat transfer.
Another common problem is the constant operation of the compressor without shutting down. If the temperature in the chamber is low (below the set point), the relay on the control board may be stuck or the sensor may be faulty. If the temperature is high and the compressor is humming but not cooling, there is likely a refrigerant leak or compressor failure. In such cases, independent setting parameters will not help.
⚠️ Attention: If you hear gurgling or hissing inside the refrigerator immediately after turning off the compressor, do not be alarmed. This is the normal flow of refrigerant through the system. However, loud knocking or vibration requires checking the installation of the unit.
Sometimes users complain that food near the back wall freezes. This may indicate that the temperature sensor is installed too close to the evaporator or the cold air damper. In such cases, it is recommended to carefully move the sensor to the central part of the chamber, away from direct flows of cold air, so that it reads the average temperature.
Do not forget that technical characteristics and interfaces may vary slightly depending on the year model release and installed version of the controller. Always check the passport data of a specific device, especially if you are setting up used equipment, where the previous owner may have changed the basic parameters.
FAQ: Frequently Asked Questions
How to reset the Polair refrigerator to factory settings?
To reset the settings, you usually need to enter the settings menu (holding the button Set) and find the parameter called "dEF" or "rSt". Setting the value to "YES" or "On" will return all settings to factory defaults. Some models require simultaneous pressing of two buttons when turning on the device.
Why is the Polair refrigerator very cold, even if it is set to +5?
Perhaps the temperature sensor is shifted to the evaporator zone, where it is colder, and the controller “thinks” that the chamber is warmer than it actually is. The cause may also be sticking contacts of the compressor control relay. Check the position of the sensor and, if necessary, call a specialist to replace the relay.
What does the flashing defrost indicator mean?
A flashing snowflake or drop indicator usually means that the evaporator is defrosting. During this time, the compressor and fan can be turned off. If the indicator blinks constantly and defrosting does not end, the heating element or defrost sensor may be faulty.
Is it possible to set a Polair refrigerator to a temperature of -18 degrees?
No, Polair single-door refrigerators (DX, SHH series) are designed for storing food at positive temperatures (usually from -5 to +10°C). Freezers (SS, NSh series) are designed for temperatures of -18°C. An attempt to set an ordinary refrigerator for deep frost will lead to compressor failure.
How often do you need to change the temperature settings in winter and summer?
Modern Polair controllers automatically compensate for changes in ambient temperature. However, if the refrigerator is located in an unheated room where the temperature drops below +10°C, adjustments or installation of a special winter kit may be required. Under normal conditions, resetting is not required.