Correct setting of the temperature mode in refrigerator Posis Paracelsus is not just a matter of comfort, but a necessary condition for long-term preservation of food freshness and the safety of your health. These models, often used in medical institutions and laboratories due to their reliability, require precise calibration, since the slightest deviation can affect the properties of stored drugs or perishable food. Unlike household analogues, stability is important here, and not just cooling.
Many users encounter difficulties during initial operation or after defrosting, not understanding how to interpret the thermostat readings. Thermostat in these models it can be mechanical or electronic, and the approach to each of them is significantly different. Ignoring the setting rules leads to the formation of excessive ice, excessive energy consumption and a reduction in the service life of the compressor.
In this manual we will analyze in detail the algorithms of action for various modifications of the series Paracels. You will learn how to avoid common mistakes that 80% of owners make when trying to set the “perfect cold”. We will consider the nuances of operation in different climatic conditions and with different loads of chambers.
Principles of operation of the Pozis thermostat
The basis of climate control in refrigerators Posis is a thermostat that automatically turns the compressor on and off depending on the temperature inside the chamber. Models Paracelsus often use mechanical regulators with a rotary scale, where the numbers do not mean degrees Celsius, but indicate the cooling intensity. Understanding this logic is the key to success.
When you turn the knob towards large numbers, you do not set a specific temperature, but order the system to work longer and more intensely. Thermal sensorlocated inside the chamber, records the decrease in temperature and opens the circuit, stopping motor. If the knob is turned to the maximum, the compressor can work almost without stopping, which leads to freezing of the evaporator.
Electronic models are equipped with digital displays, where settings are made using buttons in 1-degree increments. Here the situation is more transparent: you see the target value. However, even in such systems there is the concept of hysteresis - the difference between the on and off temperatures, which cannot be changed programmatically without service intervention.
⚠️ Attention: Never try to forcibly turn the handle of a mechanical thermostat beyond its physical stop. This can lead to damage to the shaft and the need to replace the entire assembly, which is an expensive repair.
It is important to consider that the thermostat readings are influenced by many factors: from the density of product stacking to the frequency of door opening. Thermal inertia air inside the chamber causes the system to react with a delay, so changes in settings should not be assessed instantly, and after a few hours of operation.
Step-by-step instructions: mechanical control
If your Posis Paracelsus is equipped with a rotary knob with numbers from 1 to 5 (or up to 7), follow this algorithm for the initial setup. First, make sure that the refrigerator is empty or no more than half loaded so that air can freely circulate around the Paracelsus Posis evaporator.
Set the control knob to the middle position, usually number 3 or 4. This is a standard factory calibration that provides a balance between cooling and energy consumption. Let the device operate in this mode for at least 5-6 hours without opening the doors.
After this, check the actual temperature using a separate thermometer placed in a glass of water on the middle shelf. If the readings differ from the desired ones (for example, +4°C for medicines or +2...+6°C for food), make a correction:
- 🌡️ If the temperature is higher than normal, turn the knob one notch towards increasing numbers (more cold).
- ❄️ If the food freezes or there is a lot of ice on the walls, reduce the value by one division.
- ⏳ After each change, wait for the mode to stabilize for at least 2-3 hours before measuring again.
- 🔌 Do not set up immediately after plugging in - let the refrigerator reach the mode 24 hours in advance.
☑️ Setting checklist
Remember that in the summer, when the ambient temperature in the room is high, you may need to set the knob to a higher value to compensate for heat gain. In winter, on the contrary, the load on compressor reduces, and the average values may turn out to be excessive.
Setting up electronic panels and displays
Modern modifications Posis Paracelsus can be equipped with electronic control units. Here, the temperature of the refrigerator is adjusted by pressing the “+” and “-” buttons on the front panel. The digital indicator displays the current temperature inside the chamber or the user-set value, depending on the model.
To enter the setup mode, you often need to hold the “Set” or “Mode” button for 3-5 seconds until the numbers start flashing. At this moment controller it switches to manual control mode. Use the navigation buttons to select a target value. The standard recommended range for general storage is from +2 to +6 degrees Celsius.
A feature of the electronic systems is the ability to activate special modes such as “Super Cooling” or “Eco”. The super-cooling mode forcibly keeps the compressor on until the lowest possible temperature is reached, which is useful when loading a large volume of warm food, but should not be used constantly.
⚠️ Attention: If the power supply fails, electronic models Position can reset the settings to factory settings. Always check the settings after the power supply is restored to avoid defrosting the contents.
If the display shows an error (for example, flashing characters or code "E"), this indicates a malfunction of the temperature sensor or control circuit. In this case, manual adjustment is impossible until the hardware malfunction is eliminated and the thermistor is replaced. thermistor.
What does the blinking indicator mean?
If the temperature indicator blinks, this is a signal that the current temperature in the chamber is higher than the set norm. This can happen immediately after switching on, after loading warm food, or when the door is not closed tightly. If the flashing does not stop after 2 hours of operation of the empty refrigerator, diagnostics of the sensors is required.
Table of recommended temperature conditions
Different types of stored objects require different conditions. Using universal settings may damage vaccines, reagents, or food. Below is a reference table for setting Posis Paracelsus depending on the content.
| Content type | Recommended temperature (°C) | Knob position (conditionally) | Storage features |
|---|---|---|---|
| Medical vaccines | +2 ... +8 | 3 - 4 | Requires constant monitoring, ban on freezing |
| Fresh products (general) | +3 ... +5 | 3 | Optimal for meat, dairy products, prepared foods |
| Vegetables and fruits | +4 ... +8 | 2 - 3 | Require high humidity, store in boxes |
| Frozen (if there is a freezer) | -18 and below | Maximum | Do not allow even short-term defrosting |
Please note that in single-chamber models Paracelsus the temperature is distributed unevenly. It is always colder at the back wall, where it is located evaporator, than at the door. The difference can reach 3-5 degrees.
Therefore, placing the thermometer for control should be done in the warmest zone - usually this is the bottom shelf closer to the door or a special container for vegetables, if it is not shielded from the cold. It is at this point that the temperature should not exceed the upper tolerance limit.
Factors affecting cooling accuracy
Even a perfectly tuned refrigerator Position may not work correctly if operating conditions are violated. One of the main enemies of the correct temperature regime is a violation of the tightness of the door seal. If the rubber seal has dried out or become dirty, warm air constantly penetrates inside, causing the compressor to work for wear.
Loading density also plays a role. An empty refrigerator changes temperature faster when the door is opened, since the air has a low heat capacity. On the contrary, a unit completely filled with products (especially liquids) keeps the cold better, but cools new warm products worse due to the disruption of air circulation air circulation.
The location of the refrigerator in the room matters. If Paracelsus stands close to a wall or heating devices, the heat exchange of the condenser is difficult. This leads to an increase in the temperature inside the chamber with the same regulator settings.
- 🚪 Check the tightness of the door with a sheet of paper: the sheet sandwiched between the door and the body should not be easily pulled out.
- 🌬️ Provide a gap of at least 5-10 cm around the back and side walls for ventilation of the condenser.
- ☀️ Do not install the refrigerator in direct sunlight or next to the stove, this will distort the operation of the thermostat.
- 🧊 Regularly remove the snow “coat” thicker than 5 mm, as it acts as a heat insulator.
Frequently opening the door in a hot room is another factor of destabilization. Each such cycle requires time from the system to restore the temperature gradient. In a laboratory or pharmacy environment, it is recommended to minimize the door opening time.
Typical problems and methods for eliminating them
If, after setting, the temperature in the refrigerator Posis Paracelsus does not stabilize or behaves unpredictably, there may be a technical malfunction. The most common problem is a refrigerant leak. In this case, the compressor works constantly, but there is no cooling or it is very weak.
The other extreme is a short start of the motor. If the refrigerator turns on for 1-2 minutes, then stands for a long time and turns on again for a short time, most likely the defrost sensor has failed. It “thinks” that the cold has already been reached and turns off the system prematurely. thermostat or defrost sensor. He “thinks” that the cold has already been reached and turns off the system prematurely.
The formation of an ice crust in only one corner or uneven cooling may indicate a clogged capillary tube or problems with the condensate drainage system. In such cases, simply resetting the regulator knob will not help - the intervention of a repairman is required.
⚠️ Attention: If you hear gurgling, hissing or knocking when the compressor is running, this may indicate problems with the refrigerant or the mechanical part of the motor. Operation in this mode is dangerous and can lead to permanent failure of the unit.
It is also worth considering that over time the characteristics of the refrigerant and lubricant change. An older refrigerator may require slightly different controller settings than a newer refrigerator of the same model to maintain the same temperature.
FAQ: Frequently asked questions
Why does the Pozis Paracelsus refrigerator get very cold even on the minimum setting?
This can happen for two reasons. The first is a malfunction of the thermostat, the contacts of which are “stuck” in the “on” position. The second is a design feature of some medical models, where the minimum compressor shutdown threshold is +2...+3°C, which may be too cold for household products. In this case, the products should be placed further from the back wall.
How often should you defrost the Paracelsus refrigerator?
The frequency of defrosting depends on the humidity in the room and the frequency of opening the door. On average, mechanical removal of ice is recommended when the thickness of the snow coat on the evaporator reaches 5-7 mm. This usually happens once every 3-6 months. Ignoring defrosting leads to an increase in energy consumption.
Is it possible to use a regular household thermometer for adjustment?
Yes, you can, but with caution. Household alcohol or electronic thermometers are suitable for monitoring air temperature. However, for accurate calibration of medical refrigerators Pozis it is better to use verified thermometers with an accuracy of 0.1°C, placing them in a container with water (simulator), since the air temperature fluctuates more than the temperature of the liquid.
What to do if the temperature is not restored after defrosting?
Make sure that the refrigerator is completely dry and you have connected it to the network. Let it run for at least 2 hours empty. If during this time the walls have not begun to cool, and the compressor does not make a characteristic hum or, conversely, hums constantly without cold, a freon leak may have occurred due to ice chipping. A call to the technician is required.
Does the mains voltage affect the operation of the thermostat?
Severe voltage surges can damage the electronics or cause the compressor start relay to malfunction. Although the mechanical thermostat itself does not depend on voltage, unstable operation of the motor due to low voltage can lead to the fact that the refrigerator simply does not have time to gain cold, creating the illusion of a faulty setting.