Adjusting the temperature in refrigeration equipment is a fundamental task on which the shelf life of products and the safety of their use directly depend. Models under the brand Pozis Paracels, created for the needs of pharmaceuticals and the storage of medicines, require particularly precise calibration, since degrees are counted here, and deviations can lead to damage to expensive drugs.
Unlike household models, where small fluctuations are acceptable, in professional equipment thermostat it is configured to maintain a narrow range. The user needs to clearly understand which control mechanism is installed in your modification: an electronic controller or a mechanical regulator. Incorrect settings can lead not only to defrosting of the contents, but also to failure of the compressor due to continuous operation.
This article analyzes in detail the algorithms of actions for various modifications of Pozis refrigerators, paying special attention to nuances that are often missed in standard manuals. We will look at how to interpret sensor readings and when specialist intervention is required.
⚠️ Attention: Before starting any manipulations with the settings, make sure that the refrigerator is connected to the network and operating normally for at least 4-6 hours after the last defrosting or transportation.
Principles of operation of the Paracels cooling system
Refrigerators of the Paracelsus series are most often equipped with a static cooling system, although there are also models with forced circulation (No Frost). It is based on a compressor that pumps refrigerant into the evaporator. Thermoregulator (or an electronic unit) monitors the temperature inside the chamber and gives a command to turn the motor on or off.
The key element is evaporator, which is usually located behind the back wall or at the top of the chamber. It is from this that the cold air falls down. If you set the temperature on the regulator too low, the evaporator may become coated with ice, which will disrupt heat transfer.
It is important to understand the difference between the air temperature in the chamber and the temperature of the food. The refrigerator reacts to the heating of the air, so after loading warm bottles it will work more intensely. Microprocessor tries to compensate for this jump by increasing the operating time of the compressor.
Mechanical adjustment: scale and divisions
Most models Pozis with mechanical control use a rotary knob with a digital designation. Here lies the most common mistake of users: the numbers on the scale (usually from 1 to 5 or from 1 to 7) do not indicate degrees Celsius, but cooling intensity.
The higher the number you set, the lower the temperature inside the chamber will be. If the knob is set to "1", the refrigerator will operate minimally, maintaining the temperature closer to 10-12°C. Position "5" or "7" forces the compressor to work almost without interruption, lowering the temperature to 0°C and below.
The optimal position for everyday storage of medicines and products is considered to be the average value - usually "3". However, if the room is hot (in summer), it makes sense to switch the regulator to "4" to compensate for heat gain.
- 🌡️ Unit (1) — minimal cooling, energy saving mode or storage of vegetables that do not require extreme cold.
- 🌡️ Troika (3) — standard operating mode, providing +3...+5°C inside cameras.
- 🌡️ Maximum (5-7) —super-freezing or fast cooling mode, it is not recommended to keep it constantly.
The knob should be switched smoothly, without sudden jerks. Mechanical thermostat internally is sensitive to shocks, and sudden rotation can throw off its calibration.
Electronic control and display
More modern versions of refrigerators Paracels are equipped with electronic controllers with digital scoreboard Here the settings are made using the "+" and "-" buttons or the touch screen. In this case, you set the target temperature directly, in degrees Celsius.
When you press the buttons, the current value will flash on the display. You need to wait until the readings stabilize. Electronics Pozis often have a child lock function that is activated by long pressing a certain combination (usually indicated by a lock icon).
If an alarm lights up on the display or the temperature indicator flashes, this may mean that the internal volume has not cooled down to the set parameters. In such cases, you do not need to change the settings immediately - give the refrigerator time to return to mode.
| Mode | Temperature range | Purpose |
|---|---|---|
| Cooling | +2...+8°C | Storage of vaccines, medicines, products |
| Frozen | -18...-24°C | Long-term storage (freezers) |
| Transportation | +10...+15°C | Temporary mode, resource saving |
☑️ Checking the electronic panel
Setting nuances for medical drugs
Refrigerators Posis Paracelsus were created specifically for pharmacy chains and laboratories. The main requirement here is compliance with the temperature regime +2...+8°C. Exceeding these limits can lead to denaturation of proteins in vaccines or loss of antibiotic properties.
In such models it is often used fan to mix air to equalize the temperature throughout the entire volume. If you are storing medications, it is absolutely forbidden to overcrowd the refrigerator. Air should circulate freely.
Pay special attention to the placement of the temperature sensor. In some modifications it can be moved. It should not touch the walls or food, otherwise the readings will be distorted. The correct position is in the center of the free volume.
⚠️ Attention: For vaccine storage, it is critical to avoid the “risk” area at the back wall, where the temperature can drop below 0°C even at a general setting of +4°C. Use buffer containers with water.
Why can’t you store medicines in the door?
The door is the warmest place in the refrigerator. Every time you open it, the temperature jumps sharply, which is detrimental to heat-labile drugs. The door is only suitable for infusions or dry substances.
Common mistakes when adjusting
One of the common problems is installing the refrigerator next to a heat source (battery, stove, direct sunlight). In this case, no setting thermostat will help - the compressor will work to wear out, trying to compensate for external heating.
Another mistake is setting the minimum temperature in the summer and forgetting to switch the mode in the fall. When the heating season ends and the room becomes cooler, the refrigerator on the “maximum” mode may begin to freeze food to the point of ice.
Do not forget about the rubber seals. If the door does not close tightly, warm air constantly enters. The temperature sensor will “see” heat and require the compressor to operate at full power.
- ❄️ Loading warm products without pre-cooling.
- ❄️ Frequent and prolonged opening of doors.
- ❄️ Ice on the evaporator more than 5 thick mm.
Regular defrosting (if the model is not No Frost) helps maintain cooling efficiency. The layer of ice acts as a heat insulator, preventing cold from penetrating into the chamber.
Diagnostics of thermostat malfunctions
How to understand that it is the temperature controller that has failed, and not the compressor or freon? If the refrigerator does not turn on at all at any position of the handle, or, on the contrary, it works without stopping and freezes to -20°C in the refrigerator compartment, most likely the problem is in thermostat or the electronic unit.
In mechanical models, you can try to carefully remove the handle and check whether the rod rotates. Sometimes it turns sour. In electronic models, a sign of a breakdown is a chaotic change in numbers on the display or a complete lack of response to pressing.
If you notice that the refrigerator turns on for 1 minute and turns off for 15 minutes (or vice versa), this is a sign of improper operation of the automation. You need to call a technician to replace the sensor or make adjustments.
What to do if the refrigerator is humming after adjustment?
The humming can be caused by vibration of the compressor when operating at high speeds (if you have set the maximum cooling). Try lowering the intensity by 1 notch. If the noise does not stop, check the horizontal installation with the feet.
Is it possible to use an external thermostat?
Yes, for critical loads, external controllers are sometimes installed that physically turn off the outlet when the temperature goes beyond the limits. This is more reliable than the built-in system, but requires qualifications.
How often should you check the temperature?
In medical institutions, a temperature log is kept daily (morning and evening). At home, visual inspection once a week and checking with a thermometer once a month are sufficient.
Why does ice form on the back wall?
This is normal for static refrigerators during the operating cycle. The ice melts when the compressor is turned off. If the ice does not melt and builds up, the defrost cycle is broken or the door does not fit tightly.
What temperature is considered emergency?
For a refrigeration chamber, a rise above +10°C or a drop below 0°C is considered critical. For the freezer - rise above -12°C. Modern models Pozis signal this with a sound.