Pharmaceutical refrigerators of the brand Position are the reliability standard for pharmacies, laboratories and medical institutions where strict adherence to the temperature regime for storing drugs is required. Unlike household models, here every degree is critical, since deviations can lead to damage to expensive medicines or vaccines. Users are often faced with the need for initial setup or correction of parameters after transporting equipment.
The adjustment process depends on the specific series of equipment, since the control system can be mechanical or electronic. Accuracy of readings here comes to the fore, requiring careful attention to the calibration of sensors and the selection of the correct operating mode. In this material, we will analyze action algorithms for various modifications so that you can provide ideal conditions for your drugs.
Incorrect setting of parameters can lead not only to financial losses, but also to problems during inspections by regulatory authorities. Therefore, it is important to understand the logic of operation thermostat and the features of air circulation inside the chamber. Let's look at how to properly configure the equipment depending on its technical equipment.
Features of temperature conditions in different Pozis series
The line of refrigeration equipment Position for medicine is divided into several categories, each of which has its own control features. Basic models are often equipped with mechanical regulators, where the temperature is set by turning a knob, and more advanced series, such as HF-250 or HF-400, are equipped with digital controllers. Understanding the type of device you have is the first step to proper setup.
In mechanical models, the regulator scale usually does not correspond directly to degrees Celsius. Numbers from 1 to 7 (or Min/Max) indicate the intensity of the compressor. Smaller number means less intense cooling, and higher means more intense cooling. To set the standard mode +2...+8°C, the handle is usually placed in the middle position, but the final adjustment is carried out only after the temperature measured by an external thermometer has stabilized.
Electronic models allow you to set precise numerical values. Here it is important to distinguish between temperature setting (target temperature) and the actual temperature in the chamber. The controller automatically turns the compressor on and off to maintain the set range. In some models, the function of separately setting the upper and lower alarm thresholds is available.
It is worth noting that in models c digital indication there are often hidden menus or calibration modes accessible only to specialists. However, basic settings are available to the user through the control panel. If you see flashing symbols on the display, this may indicate that the temperature is outside the permissible range or a sensor malfunction.
Algorithm for setting electronic controllers
For refrigerators equipped with an electronic control unit (for example, series with controllers Mikom or similar), the setup process looks like programming parameters. You need to enter the settings menu using a combination of buttons. Usually this is a long press on the "Set" button or pressing two keys simultaneously.
After entering the menu, navigation is carried out using the arrow buttons. You need to find the parameter responsible for the target temperature (often indicated as SET or T-Set). Change the value to the required value, for example +5°C, and confirm the action. The system may request confirmation of entering the programming mode to prevent accidental changes by personnel.
☑️ Setting up the electronic controller
It is important to correctly set the hysteresis (the difference between the on and off temperatures). A hysteresis that is too narrow will lead to frequent starts of the compressor, which will shorten its service life, while a hysteresis that is too wide will create dangerous climate fluctuations inside the chamber. A range of 2-3 degrees around a given point is considered optimal.
⚠️ Attention: Do not leave the refrigerator open while setting parameters for longer than necessary. Loss of cold will cause the compressor to work in increased mode, which may cause a false alarm from the sensors.
After making changes, the system may reboot. Make sure that the display shows correct data and that the compressor operation indicator responds to temperature changes. If you get lost in the menu, it is better to exit without saving or reset the settings to factory settings, if the model allows you to do this safely.
Adjustment of mechanical thermostats
In classic models such as HF-120 or older series, adjustment is carried out with a rotary switch. The scale can contain numbers from 1 to 5 or 1 to 7. The golden rule applies here: the higher the number, the colder it is. However, where exactly the middle of the scale is, corresponding to +5°C, depends on the ambient temperature (room temperature) and the camera load.
For precise installation, you will need an external verified thermometer. Set the control knob to the middle position (for example, 3 or 4). Wait a few hours until the temperature stabilizes. Take readings from an external thermometer placed in the center of the chamber on the middle shelf, away from the walls.
If the readings of the external device differ from the required ones, make a correction:
- 🌡️ If the chamber is warmer than +8°C, turn the knob towards higher values (increase power).
- ❄️ If the temperature drops below +2°C, reduce the regulator value.
- ⏳ After each turn of the knob, wait at least 1-2 hours before the next measurement.
Mechanical thermostats have play and can “float” over time. Regular checking with a reference thermometer is a must for a pharmaceutical refrigerator. Do not blindly rely on the position of the handle, as wear of the bimetallic plate inside the thermostat can change its characteristics.
Why are mechanics sometimes better than electronics?
Mechanical thermostats are less sensitive to power surges and are easier to repair. In conditions of unstable power supply in remote pharmacies, they often turn out to be more reliable than complex electronic boards.
Calibration of sensors and working with errors
Any measuring instrument has an error, and refrigerators Position are no exception. Factory calibration is carried out on an empty chamber, but when fully loaded with drugs, the air circulation changes, which can lead to a shift in temperature zones. Professional models provide a function for correcting sensor readings (Sensor Offset).
To perform calibration, you need to compare the readings of the built-in display with the readings of a reference thermometer. The difference between them is the magnitude of the error. Enter the service menu (often an access code or a special combination of buttons is required) and find the correction parameter. Enter the value that compensates for the difference.
| Reference readings | Display readings Position | Necessary correction | Menu action |
|---|---|---|---|
| +5.0°C | +6.5°C | -1.5°C | Set Offset: -1.5 |
| +5.0°C | +4.0°C | +1.0°C | Set Offset: +1.0 |
| +5.0°C | +5.0°C | 0°C | No correction required |
The calibration procedure is critical to passing audits. Pharmaceutical standards (for example, GOST R 52236-2004 or GSP rules) require that equipment provide the declared range with high accuracy. If the error exceeds the permissible standards even after software correction, it may be necessary to replace the sensor itself.
Remember that sensors in different zones of the chamber may show different values due to the characteristics of airflow. Always place critical drugs in the area where the temperature is most stable and corresponds to the set one, usually this is the central part of the shelves, and not at the back wall or at the door. Calibrate the device specifically according to the sensor that controls the main storage area.
Cold distribution and storage areas
Even a perfectly tuned refrigerator has an uneven temperature distribution. In models Posis with a system No Frost or dynamic cooling, air circulates more actively, which evens out gradients, but creates zones of direct airflow. In static models (drip system), the difference between the top and bottom shelves can reach several degrees.
Cold air is heavier than warm air, so in static refrigerators it is always colder below. If you store freeze-sensitive medications, do not place them on the bottom shelf near the back wall. In contrast, vaccines that require strict adherence to the lower threshold are best kept close to a source of cold, but not in an area at risk of freezing.
- 📦 Top shelves: Here the temperature is usually above average. Suitable for drugs with a wide storage range.
- 🧊 Bottom shelves: The coldest zone in static models. Dangerous for drugs that cannot be frozen.
- 🚪 Door: The area with the greatest temperature fluctuations when opening. Not recommended for storing critical medications.
⚠️ Attention: Do not seal the ventilation holes inside the chamber or press medications against the back wall. Impaired air circulation will lead to local overheating or “heat bags” that the sensor will not see.
Proper loading of the refrigerator is also part of the temperature regime. A full chamber holds the cold better, since the preparations themselves work as cold accumulators. However, if the chamber is packed too tightly, cold air cannot circulate, and thermostat may read data incorrectly, turning off the compressor prematurely.
Diagnosing temperature problems
If you have set the settings, but the temperature does not stabilize or constantly “jumps”, it is necessary to carry out diagnostics. First of all, check the door seal: even a small gap will lead to a constant influx of warm, moist air and the formation of ice, which will disrupt heat transfer. Clean the seal and check the seal.
The second common cause is a malfunction of the sensor or control unit. If an error code appears on the display (for example E1, E2 or the temperature indicator is flashing), refer to the user manual. Often this indicates an open circuit of the sensor or its failure. In such cases, independent adjustment is impossible.
It is also worth checking the location of the refrigerator. If it is located next to a radiator, in direct sunlight, or in a niche with poor ventilation, the compressor may not be able to cope with the heat flow. The distance to the walls should be at least 10-15 cm for normal operation of the heat exchanger.
What to do if the refrigerator freezes too much even at minimum?
If the mechanical regulator is turned to minimum (1), and the temperature is still below +2°C, the thermostat is likely to malfunction (contacts sticking) or freon leakage (in some cases causes cyclical work). Also check that the drain is not clogged, as ice may block the sensor. A technician is required to replace the thermostat.
How often should you check the temperature in a pharmaceutical refrigerator?
According to the rules of good practice, the temperature should be monitored continuously (using temperature recorders) or at least twice a day (morning and evening) and recorded in a log. When loading a new batch of drugs, control is strengthened.
Is it possible to use a Pozis household refrigerator for medicines?
Technically, it is possible if it provides a stable range of +2...+8°C. However, household models do not always have accurate calibration and protection against power surges. An official pharmacy requires a certificate and passport for refrigeration equipment confirming its suitability for pharmacy.
Why is the temperature indicator flashing on the display?
Flashing usually indicates that the current temperature in the chamber is outside the set limits (too high or too low). This may be a short-term phenomenon after loading warm food or opening the door. If the blinking does not stop after 30-60 minutes, check the settings and tightness.