Old two-chamber refrigerators Stinol are deservedly considered one of the most reliable units ever assembled in the post-Soviet space. Despite their venerable age, many of them continue to work properly, but over time, owners are faced with the need to fine-tune the temperature regime. It often happens that food freezes in the freezer compartment, and in the refrigerator compartment, on the contrary, it becomes too warm to store perishable foods.
Independent adjustment of such models is quite possible if you understand the principle of operation of mechanical thermostats and air dampers. Unlike modern electronic control systems, where all parameters are set by buttons, in old ones Stinolakh everything is tied to the physics of processes and the correct calibration of mechanical components. Intervention in operation of automation requires accuracy, but does not always require calling a specialist.
In this article we will analyze the main components that affect the climate inside the chamber and methods for their correction. You will learn how to correctly set the temperature, adjust the position of the doors and configure the condensate drainage system to extend the life of your “veteran” for several more years.
The principle of operation of a mechanical thermostat
The heart of the temperature control system in older models Stinol-101, Stinol-102 i Stinol-103 is a mechanical thermostat. This device is a sealed system filled with gas or liquid that responds to pressure changes due to temperature fluctuations. When the air in the chamber heats up, the gas expands and opens the contacts, starting the compressor. Accuracy of operation this unit is critical for stable cooling.
Adjustment is carried out by turning the handle located inside the refrigerator compartment. The scale usually has numbers from 1 to 5 or from Min to Max. It is important to understand that these numbers do not indicate degrees Celsius, but indicate the degree of tension of the spring inside the thermostat. Turn clockwise increases the tension, requiring more cooling to open the contacts.
⚠️ Attention: If the thermostat knob scrolls endlessly or does not make a characteristic click when turning, the mechanism may be damaged or the rod may be knocked down. In this case, simple external adjustment will not help.
In some cases, fine adjustment requires access to the internal calibration screws hidden under the plastic handle. Removing the cap allows you to gain access to the adjusting screw, which shifts the temperature point when the compressor turns on and off. This fine tuningis necessary if a standard turn of the knob does not give the desired result.
How to remove the thermostat knob?
Usually the knob is simply pulled onto the rod. Carefully pry it off with a flat screwdriver on both sides, trying not to damage the plastic, which could become brittle over the years of use.
Diagnostics of the temperature conditions in the chambers
Before grabbing the tools, you need to objectively assess the current condition of the refrigerator. Determining temperature by eye (“it seems a little cold”) often leads to errors. For high-quality diagnostics of older models Stinol it is best to use an external thermometer placed in a glass of water, which is placed on the middle shelf.
The normal operating mode for the refrigerator compartment is considered to be a range from +2 to +6 degrees Celsius. In the freezer compartment of old two-chamber units, the temperature should drop to -18 degrees or lower. If you observe significant deviations, it is necessary to analyze the nature of the compressor operation. On cycle is an important indicator of the health of the system.
- ❄️ The compressor works almost non-stop - probably a freon leak or a violation of the tightness of the circuit.
- 🔇 The unit turns on rarely and works for a short time - perhaps the condenser is clogged or the thermostat is faulty.
- 💧 A “coat” of ice forms on the back wall - the heat outflow is impaired or the door seal is damaged.
Particular attention should be paid to the uniformity of cooling. In older models with a drip defrosting system, cold air is distributed by natural convection. If it’s warm on the top shelf, but everything freezes on the bottom, the problem may not be in the thermostat, but in air circulation or the position of the products.
Thermostat adjustment and calibration
If diagnostics showed that the temperature does not correspond to the set position of the handle, calibration is necessary. In models Stinol with mechanical control, a situation often occurs when position “3” gives a temperature of +8°C, which is too much for meat, and position “4” already freezes vegetables. The solution is internal adjustment.
To begin the process, remove the regulator knob. Underneath you will see a rod and possibly two small holes or screws. One of them (usually the one closer to the center or marked with a dot) is responsible for shifting the entire range. Turning this screw by 45 degrees can change the temperature at which the compressor turns on by 0.5–1 degree. Calibrating screw requires very careful handling.
After each adjustment, you must wait for the refrigerator to complete its operating cycle (turning on and off), which can take several hours. Only after the regime has stabilized can one draw conclusions about the effectiveness of the procedure. Do not try to set the ideal temperature at one time.
☑️ Calibration algorithm
The table below shows approximate correspondence between the handle position and the temperature inside the chamber for a working refrigerator Stinol:
| Handle position | Approximate temperature | Compressor operating mode | Recommendation |
|---|---|---|---|
| 1 (Min) | +8...+10°C | Rare starts | Summer, light load |
| 3 (Average) | +4...+6°C | Normal cycle | Standard mode |
| 5 (Max) | 0...+2°C | Frequent operation | Heat, full load |
| 6 (Freezing) | Mode without switching off | Continuous operation | Only for fast freezing |
Setting the air damper between the chambers
In two-chamber refrigerators Stinol of the old model, cooling of the refrigerator compartment often occurs due to cold air coming from the freezer compartment through a special channel. The flow of this air is regulated by a damper. If it’s too cold in the “refrigerator” and too warm in the “freezer,” the settings of this unit are most likely off.
The damper can be mechanical, with an adjustment lever, or automatic, depending on the pressure in the channel. In mechanical models, you need to find a lever (often located in the upper part of the refrigeration chamber or in the channel between the chambers) and change its position. Channel cross-section directly affects the volume of cold supplied.
Often the problem lies in freezing of the channel itself. The ice blockage blocks the air flow, and the thermostat in the refrigerator compartment does not sense the cold, forcing the compressor to work continuously. As a result, there is a “polar night” in the freezer, and warmth on top. In this case, complete defrosting of the unit is required for at least 24 hours.
⚠️ Attention: When cleaning the channel between the chambers, use sharp objects or hot water to speed up defrosting. A sudden temperature change can damage the evaporator.
Adjusting the position of doors and seals
The tightness of the chambers is the key to the proper operation of any refrigerator. If the door does not fit tightly, warm, moist air constantly enters. This leads to a continuous build-up of ice on the evaporator and malfunctions of the thermostat. In old Stinolakh loops wear out or sag over time.
The doors are adjusted by tightening the fastening bolts on the hinges. To do this, the door must be carefully lifted or removed, depending on the design of a particular model (Stinol-101, 102, 103 they have different fastening patterns). After installing the door in place, check the tight fit around the entire perimeter. Sealing rubber should touch the body evenly.
- 🚪 The door is skewed down - the lower hinge needs to be adjusted or the bushings replaced.
- 🌬️ The seal does not fit in the corner - try warming this area with a hairdryer or soaking the rubber in hot water.
- 🔩 Creaking when opening - lubricate the hinges with machine oil or silicone grease.
If adjusting the hinges does not help, the hinge itself may be deformed the housing or seal has lost elasticity. In this case, replacing the rubber circuit is the only effective solution. The new seal will ensure correct thermal insulation and reduce the load on the compressor.
Elimination of common problems after adjustment
After adjustment work, nuances may appear that were previously hidden by the unstable operation of the thermostat. For example, the refrigerator may start making new sounds or change its condensation pattern. This is normal during the period of adaptation of the mechanisms to new settings.
If the compressor starts to turn on more often, but works for less time, this may indicate that you have set the shutdown temperature too high. Try to slightly reduce the value on the regulator. Operation balance The motor is important for its longevity.
If after all the manipulations the refrigerator stops turning off completely, immediately unplug it from the network. This may mean that the thermostat sensing element has failed or a refrigerant leak has occurred, and further operation is dangerous. Continuous operation of the compressor without turning off for more than 2 hours with the door closed is a sign of a serious malfunction.
Why did the Stinol refrigerator stop turning off after adjustment?
Most likely, you tightened the adjusting screw too much or turned the knob to the maximum. The thermostat “thinks” that the chamber is still warm. Return the settings to the middle position and let the unit work for a day.
Is it possible to replace a mechanical thermostat with an electronic one in an old Stinol?
Theoretically it is possible, but this requires deep knowledge in electrical engineering and alteration of the control system. For older models, this is not economically feasible and can disrupt the operation of the standard automation.
How often do you need to defrost old two-chamber models?
Models with manual defrosting of the freezer compartment and a drip system in the refrigerator compartment require defrosting the freezer 1-2 times a year, when the ice layer reaches 5-7 mm. A complete shutdown for washing is also recommended twice a year.
What to do if the refrigerator compartment is too cold at minimum?
This is a sign of a malfunction of the thermostat, which does not open the circuit when the temperature reaches low. The sensor needs to be replaced. You can temporarily use an external time relay, but this is not a solution to the problem.