Correct temperature control in refrigeration equipment is the fundamental basis for long-term and safe storage of food products. The model range Posis Paracelsus, originally developed for medical institutions, has unique precision characteristics that are highly valued in home use. However, unlike modern electronic control panels, the mechanical thermostats of these units require the owner to understand the principles of operation and visual interpretation of the scale indicators.
Incorrectly set parameters can lead to spoilage of products or, conversely, to their freezing, which is especially critical for medicines and vaccines if the device is used for its intended purpose. In this article, we will look in detail at how to properly set thermostatwhat the numbers on the scale mean and how to avoid common mistakes during operation.
Owners should remember that the stability of the microclimate inside the chamber directly depends not only on the position of the regulator knob, but also on external factors, such as the room temperature and the frequency of door opening. Understanding these nuances will allow you to make the most of the resource of your of the Pozis refrigerator and provide ideal conditions for the contents.
The principle of operation of the thermostat in Paracelsus models
The main element of climate control in refrigerators Position is a mechanical thermostat that physically opens and closes the electrical circuit of the compressor. Unlike digital systems, there is no accurate display of degrees Celsius, which often causes confusion among new users. The adjustment is carried out by turning the handle, which changes the tension of the spring inside the sensor, which responds to changes in the temperature of the evaporator.
The thermostat scale is usually graduated from the minimum value (often indicated as “Min” or “1”) to the maximum (“Max” or “7”). It is important to understand, that moving the knob in the direction of increasing the number does not add cold linearly, but makes the compressor work longer, without turning off, until the temperature inside the chamber drops to a given threshold. The higher the number, the lower the temperature inside.
⚠️ Attention: The mechanical thermostat has inertia. After turning the knob, the actual change in temperature inside the chamber does not occur instantly, but over several hours. Do not try to turn the regulator every 15 minutes in search of the ideal - this will lead to instability of the compressor.
The design of thermostats installed on Posis Paracelsusis highly reliable and maintainable. Even if it fails, replacing this unit does not require complex electronics and can be performed by a qualified technician. However, correct initial setting allows you to avoid unnecessary wear and tear on the unit and excessive energy consumption.
Deciphering the thermostat scale and values
On the front panel of the refrigeration cabinet there is a round handle with divisions. For household users, it often remains a mystery what temperature each number corresponds to. Manufacturers do not always indicate the exact gradation in the passport, since it depends on the ambient temperature (temperature in the room). However, there are established practices and technical standards for such devices.
Typically the scale ranges from 1 to 7 (or from “Min” to “Max”). Position “1” or “Min” means that the compressor will turn off when it reaches a relatively high temperature, for example +8...+10°C. This is the minimum cooling mode. Position “7” or “Max” causes the motor to work almost continuously, maintaining a temperature of about 0...+2°C.
For clarity, we provide an approximate table of correspondence between the position of the handle and the expected temperature in the main chamber, provided that the room temperature is +20...+25°C:
| Handle position | Mode work | Approximate t° in the chamber | Recommendation for use |
|---|---|---|---|
| 1 (Min) | Weak | +8...+10°C | Short-term storage of vegetables, "Vacation" mode |
| 3 | Medium | +4...+6°C | Standard mode for most products |
| 5 | Strong | +2...+4°C | Hot weather, full load of products |
| 7 (Max) | Maximum | 0...+2°C | Quick freezing (short-term), storage of medicines |
⚠️ Attention: The indicated temperatures are approximate. Actual indicators depend on the loading density of the chamber, the tightness of the seals and the air temperature in the room where it is installed. refrigerator.
The handle position between 3 and 4 divisions is considered optimal for everyday use. It is in this range that a balance is achieved between energy consumption and cooling quality. If you store medications in the chamber that require strict temperature control (from +2 to +8°C), you will need to use an external thermometer for calibration.
Step-by-step instructions: how to set the temperature
The process of setting the temperature in Posis Paracelsus does not require special tools, but requires a sequence of actions to achieving a stable result. Before starting the adjustment, make sure that the refrigerator is connected to the network and has been operating normally for at least 5-6 hours after the last defrosting or transportation.
First, determine the current temperature inside the chamber. If you don't have a built-in thermometer, place a regular household thermometer in a glass of water on the middle shelf and leave for 2-3 hours. This will give an accurate understanding of the current situation.
☑️ Checklist before setting up
Next follow the algorithm:
- 🌀 Find the handle thermostat —it is usually located inside the chamber at the top left or on the top panel of the case.
- 🌀 Evaluate the current position —remember what number the pointer is on.
- 🌀 Make adjustments —if the chamber is too warm, turn the knob clockwise (towards large numbers) by one division. If it is too cold - counterclockwise.
- 🌀 Wait for stabilization - after changing the settings, at least 4-6 hours must pass before the temperature levels out.
Repeat the procedure at intervals of half a day, until you reach the desired indicators. Sharp switching from “Min” to “Max” and back is harmful to the compressor start relay.
Setting features for medical purposes
Refrigerators Posis Paracelsus are often used in pharmacies, laboratories and medical offices for storing vaccines, reagents and drugs. In this case, the temperature requirements are much stricter than for domestic use. Standard ranges for medicines are usually +2°C to +8°C, and for some vaccines - strictly from +2°C to +6°C.
A mechanical thermostat cannot guarantee accuracy to the degree without external control. Therefore, if you use the device for medical needs, required the presence of an autonomous temperature recorder or a calibrated thermometer with an alarm. In this case, setting the thermostat knob is done empirically: you set the position, wait a day, compare the readings with a reference device and make micro-adjustments.
⚠️ Attention: For vaccine storage, it is critical to avoid “dead zones” with low temperatures at the back wall where the evaporator is located. Do not place drugs close to the back wall even with the general mode set correctly.
The nuances of storing insulin
Insulin cannot be frozen - it loses its properties irrevocably. If your refrigerator is prone to overcooling at the minimum thermostat settings, use special thermal containers inside the chamber to smooth out differences.
It is also worth considering that medical refrigerators often operate in conditions where doors are frequently opened during the working day. This requires compensation for cold losses. You may have to set the regulator knob to a value higher (closer to 5-6) than in static home mode so that the average temperature remains normal.
Factors influencing the temperature inside the chamber
Even an ideally set thermostat knob does not guarantee a constant temperature if you ignore external and internal factors. Understanding these variables will help you quickly figure out why the refrigerator suddenly started working differently.
First of all, the ambient temperature affects it. If refrigerator stands in the kitchen next to the stove or is exposed to direct sunlight, heat exchange is disrupted. The compressor has to work hard to compensate for external heat. In such conditions, even the “7” position may not provide the required cold.
Other important factors:
- ❄️ Loading with products —an empty refrigerator cools down faster, but also heats up instantly when the door is opened. A full chamber holds the cold better (products work as a cold accumulator), but requires more time for initial cooling.
- ❄️ The tightness of the seal - if the rubber on the door is worn out or dirty, warm air constantly flows inside. The thermostat will “think” that the chamber is warm and keep the compressor on constantly, which will lead to freezing.
- ❄️ Ice freezing —the thick “coat” on the evaporator works as a heat insulator. The cold is no longer effectively transferred into the chamber. Regular defrosting (at least once a year) is necessary for correct operation.
Do not forget about the technical condition of the unit itself. A freon leak or thermostat malfunction can simulate an incorrect setting. If, at any position of the handle, the refrigerator either does not cool at all or turns everything into ice, the problem lies deeper than simple adjustment.
Typical problems and methods for solving them
During operation, owners Posis Paracelsus may encounter a number of situations that are mistakenly taken for a breakdown, although they can be solved by correct settings. Let's look at the most common scenarios.
The first problem is insufficient cooling. The food spoils, the chamber is warm. Often the reason lies in the fact that the knob is set to minimum (1-2), and the room is hot. Solution: turn the regulator to 4-5. If this does not help, check whether the condenser at the back is not clogged with dust and whether there is a gap between the back wall of the refrigerator and the wall of the room for ventilation.
The second problem is freezing of food. Vegetables turn to ice, milk freezes at the back wall. This is a signal that the thermostat is set to maximum (6-7) or the thermostat itself is “stuck” in the “on” position. Try lowering the value to 2-3. If the situation does not change after a day, you may need to replace the thermostat.
The third problem is cyclic instability. The temperature drops and rises. This may be due to the temperature sensing element being incorrectly positioned (if it was moved during repairs) or due to food blocking the flow of cold air from the evaporator. Ensure proper air circulation inside the chamber.
Expert advice on savings and durability
Proper temperature setting is not only the safety of food, but also saving the family budget. Operating the compressor at maximum modes (knob to “Max”) increases energy consumption by up to 30% compared to the optimal mode.
Experts recommend that in winter, when the temperature in the apartment drops, slightly reduce the power of the refrigerator (move the knob closer to 2-3). In summer, on the contrary, you can add power. But remember the golden rule: refrigerator should not operate at its maximum capacity all the time.
Regularly check the temperature using an external thermometer, especially after defrosting or rearranging furniture. This will take a couple of minutes, but will save your supplies. Also, make sure that the ventilation holes inside the chamber are clean - their blockage with bags or containers disrupts air circulation and confuses sensor readings.
Is it possible to store medicines in the normal refrigerator mode?
Yes, most medicines require a temperature range of +2 to +8°C, which corresponds to the average settings of a household refrigerator (3-4 divisions). However, it is important to place them not at the back wall or on the door, where the temperature fluctuates the most. For critical medications, use thermal containers.
Why does the refrigerator hum more after setting it to maximum?
An increased hum indicates an increased load on the compressor. At maximum settings it works longer and more intensely. If the noise becomes unnatural (metallic clanging, vibration), immediately reduce the power and call a technician.
How often should you check the thermostat settings?
It is enough to check once a season (when changing between winter and summer) or after a significant change in the refrigerator load. If you have not changed the position of the knob and the products are stored well, frequent adjustments are not required.
What to do if the thermostat knob spins endlessly?
If there are no characteristic on/off clicks and the knob rotates without resistance, this is a sign of a breakdown in the internals of the thermostat. In this case, the refrigerator will most likely either not turn on or work non-stop. A part needs to be replaced.