Owners of brand household appliances Position often face the need for manual adjustments to temperature conditions, since these units, especially classic models, are equipped with mechanical control systems. Adjustment does not always mean failure; often this is a planned procedure for seasonal adaptation or a reaction to changes in the loading of chambers with products. Understanding the principles of operation of the thermostat allows you to avoid calling a technician and extend the life of the compressor.
Before starting any manipulations, you must clearly understand that temperature adjustment is a balancing act between cooling efficiency and energy consumption. Incorrect settings can lead to overfreezing of vegetables or, conversely, to spoilage of perishable foods. In this article we will analyze in detail the algorithms of action for various situations.
Principles of operation of the Pozis thermostat
The main element of climate control inside the refrigeration compartment is thermostat (thermostat). In most models Pozis it is a mechanical device that opens the electrical circuit when the set temperature is reached. Turning the knob changes the spring force, which affects the moment the contacts open.
It is important to understand that the scale on the thermostat knob (usually from 1 to 5 or 1 to 7) does not display degrees Celsius. The numbers indicate the cooling intensity: the higher the value, the colder it will be in the chamber. Mechanical regulator works on the feedback principle, reacting to the temperature of the evaporator or air in the chamber, depending on the design of the specific model.
There is a common misconception that setting the knob to maximum provides rapid cooling of a large number of products. In fact, this forces the compressor to work almost non-stop, which leads to its overheating. Thermostat You must periodically turn off the unit to rest the electric motor.
Preparing for temperature calibration
Before turning the adjusting screws or turning the knobs, it is necessary to diagnose the current condition. Randomly changing settings without understanding the underlying situation can aggravate the problem. You will need an ordinary household thermometer capable of measuring negative and positive temperatures.
The preparation process includes freeing up space for access to controls and stabilizing the operation of equipment. If the refrigerator has just been turned on or has been loaded with warm food, the readings will be incorrect. It is necessary to wait for the compressor to complete its operating cycle.
☑️ Preparation for adjustment
Pay attention to the following factors that may distort temperature readings:
- 🌡️ The presence of a large number of warm products loaded at the same time.
- 🚪 A loose door or a damaged seal that allows warm air to pass through.
- ❄️ Formation of a thick ice crust on the evaporator, which disrupts heat exchange.
- ☀️ Direct exposure to sunlight or being near a heat source (battery, stove).
⚠️ Attention: If you find that the rubber door seal is cracked or does not fit tightly, adjusting the thermostat will not have the desired effect. First, replace or repair the seal.
Setting a mechanical thermostat
The most common type of control in refrigerators Position is a rotary knob inside the refrigerator compartment. It is connected to a thermostat, which can be located both inside and outside the housing (under the top cover). Fine adjustments often require access to the internal mechanism.
If the knob inside the chamber does not give the desired result or has too much play, the thermostat itself may need to be adjusted. To do this, in some models it is necessary to remove the top cover of the refrigerator. Under it, next to the light bulb, there is often the thermostat itself with an adjusting screw.
Rotating this screw allows you to shift the operating temperature range. Tightening the screw (clockwise) usually increases the shutdown temperature, making the camera warmer, while unscrewing it lowers it. This must be done with microscopic movements, no more than a quarter of a turn at a time.
Where to look for the thermostat in different models?
In classic Pozis models, the thermostat is often hidden under a plastic cover in the upper part of the refrigerator compartment, next to the lamp shade. In some modern modifications, it may be hidden behind a decorative panel on the back wall.
Adjusting the air damper in two-chamber models
In two-chamber refrigerators Pozis with a No Frost system or static cold distribution plays an important role. air damper. It is she who doses the supply of cold air from the freezer to the refrigerator compartment. If the damper opens too wide, the food in the main chamber will freeze.
The damper is adjusted either through an electronic menu (if there is a display) or mechanically. In mechanical models, the damper control lever is located on the rear wall of the refrigerator compartment. Moving the lever changes the cross-section of the channel for air passage.
When setting, you should be guided by the following rule: the higher the damper position, the less cold air enters the chamber. If you see that all the products are covered with frost at the back wall, the damper must be closed, limiting the flow.
| Knob position | Temperature effect | Recommended use |
|---|---|---|
| Minimum (1) | Weak cooling (+8...+10°C) | Summer period, light load |
| Average (3-4) | Optimal mode (+3...+5°C) | Standard year-round operation |
| Maximum (5-7) | Intensive cooling (0...+2°C) | Loading a large volume of products |
| Shutdown (0/Off) | The compressor does not work | Defrost or prolonged absence |
Seasonal adaptation and "Winter-Summer" mode
The ambient temperature significantly affects the operation of the refrigeration circuit. In summer, when the room is hot, heat exchange from the condenser (grid at the back) is difficult. In winter, at low room temperatures, the oil in the compressor thickens, and the refrigerant may not completely evaporate.
Many models Posis are equipped with a climate class switch or require manual reconfiguration. In summer, it is recommended to set the regulator to average values so as not to overload the system. In winter, if the refrigerator is in an unheated room, you may need to set the thermostat to lower values.
There is a myth about the “super-freeze mode” that needs to be turned on in winter. This is not true. If the room is colder than +10°C, a regular refrigerator may not turn on at all, since it “seems” that it is already quite cold inside. In such cases, it is necessary to install a special thermostat zone heater.
- ☀️ In summer, make sure that the refrigerator is not standing close to the wall, leave a gap of 10 cm for ventilation.
- ❄️ In winter, check that the drainage channel is not frozen, which can become clogged with condensate during rare defrost cycles.
- 🌡️ In the off-season, check the tightness of the door, as the plastic can shrink or expand.
⚠️ Attention: Operating the refrigerator at an ambient temperature below +10°C (unless otherwise stated in the passport) can lead to compressor failure due to oil solidification.
Diagnostics and elimination of common problems
Even after correct adjustment, they may situations arise when the temperature regime does not stabilize. Often this does not indicate a configuration error, but rather a component failure. For example, if the compressor operates continuously and the temperature does not drop below +10°C, there is probably a leak of freon. refrigerant (freon).
If the unit, on the contrary, freezes to the point of a “stone block” even at the minimum thermostat settings, the problem may lie in sticking contacts the thermostat itself or a coolant leak from the thermostat bellows. In this case, replacement of the part is required.
The growth of a “coat” of ice on the back wall with a normally operating compressor often indicates a leak in the door or a malfunction of the defrost heating element (in No Frost models). Temperature control is powerless here - repair is needed.
What to do if you hear a gurgling sound?
Gurgling and gurgling immediately after the compressor is turned off is normal. This is how refrigerant flows through the system. If the sound is accompanied by vibration or knocking, check that the refrigerator is installed evenly.
Frequently asked questions (FAQ)
Why does the Pozis refrigerator not turn off after adjustment?
If, after setting the knob to minimum, the compressor continues to hum without stopping, the thermostat may be faulty and not opens the circuit. Also, the cause may be a freon leak or loss of tightness of the circuit.
What number should be set on the thermostat in the summer?
In the hot season, the optimal position of the knob is between 2 and 3 (for a scale up to 5) or 3 (for a scale up to 7). This will allow the products not to deteriorate, but will not create a critical load on the motor.
Is it possible to replace a mechanical thermostat with an electronic one?
Theoretically, this is possible, but it requires a deep modification of the electrical circuit and housing design. The factory Posis does not provide for such modernization, so it is easier and more reliable to replace a failed mechanical unit with a similar one.
What does the red dot on the thermostat handle mean?
A red dot or mark on the scale usually indicates the maximum mode frost or emergency mode. Constant operation in this position is not recommended, since the compressor resource is consumed faster.