A decrease in cooling efficiency or, conversely, excessive freezing of food often indicates a malfunction of the temperature control system. In most cases, the cause is a failure thermostat, which stops correctly reading data inside the cameras. For owners of household appliances of the brand Biryusa the relevant question is where exactly this unit is located, since the design can differ significantly depending on the year of manufacture and model of the unit.
Searching for a temperature sensor requires preliminary preparation and understanding of the device of your refrigerator. Incorrect installation location may result in damage to internal panels or loss of circuit sealing. In this article, we will analyze in detail the thermostat search algorithms for various modifications, including classic two-chamber models and modern electronically controlled systems.
Before you begin disassembling, make sure that you have basic skills in working with power tools and understand the principles of electrical safety. The thermostat in Biryusa refrigerators can be located both inside the refrigeration chamber behind a plastic lining, and outside on the back wall, hidden under a metal casing. Accurate knowledge of the location will save you time and prevent unnecessary damage to decorative elements.
The principle of operation and types of Biryusa thermostats
The thermostat, or thermostat, is an electromechanical device that closes and opens the electrical circuit of the compressor depending on the temperature in the evaporator or the air in the refrigeration chamber. In technology Biryusa historically, reliable capillary sensors have been used, where the sensitive element is filled with freon or an inert gas. When the temperature changes, the pressure in the capillary changes, affecting the membrane, which switches the contacts.
Modern models can be equipped with electronic thermostats, where a thermistor plays the role of a sensor. However, most repairable models, especially those released before the introduction of widespread electronics, use mechanical regulators of the TAM, K-50 or K-59 series. Understanding the type of device you have installed is critical to choosing a diagnostic method.
Mechanical thermostats have high maintainability and can often be easily replaced without complex reconfiguration of the electronics. Electronic equivalents require the control board to be checked and may need to be calibrated after installing a new element. To determine the type of device in your case, it is enough to remove the regulator handle and visually assess the presence of a temperature scale or digital display.
What is the difference between TAM and K-59?
Thermostats of the TAM series often have a longer capillary tube and are designed for installation in the evaporator, while K-59 more often react to air temperature and have a shortened sensitive element.
Location of the thermostat in old and new models
The location of the thermostat directly depends on the series of the refrigerator. In classic models Biryusa with a top freezer, produced in the 90s and early 2000s, the thermostat is most often located inside the refrigerator compartment. It is hidden behind a plastic panel located under the ceiling of the chamber, next to the lighting lamp or the light button.
In more modern or specific modifications, as well as in some two-compressor versions, manufacturers could move the thermostat outside. In such cases, it is mounted on the rear wall of the unit, in the area of the compressor, and is covered with a protective metal or plastic casing. This simplifies access to the unit, but requires disconnecting the device from the network and moving the refrigerator away from the wall.
To accurately determine the installation location in your specific model, it is recommended to use the following table, which organizes data by popular series:
| Series / Model | Thermostat location | Access type | Dismantling features |
|---|---|---|---|
| Turk 6, 8, 9 (Classic) | Inside, under the top panel | Removing the lampshade and panel | You need to unclip the latches |
| Turk 10, 11, 14 | More often inside, near the ceiling | Disassembling a plastic box | Attention to fragile plastic |
| Biryusa 133, 134 | Rear, near the compressor | Removing the rear casing | Requires access to the rear wall |
| Biryusa 355, 455 | Inside or outside (variable) | Depends on the year of manufacture | You need a visual check |
If your model is not listed in the table, be guided by the presence of an adjustment screw or knob with numbers inside the camera. If the handle is inside, then the mechanism itself is most likely there. The absence of internal temperature controls is almost guaranteed to indicate an external location of the thermostat.
Instructions: how to get to the thermostat inside the chamber
If you have determined that the thermostat is located inside the refrigerator compartment, you will need a minimum set of tools: flat and cross screwdrivers, perhaps a knife to carefully pry up the plastic latches. Before starting work, be sure to disconnect the refrigerator from the power supply by removing the plug from the outlet. This is a basic safety requirementignoring of which is unacceptable.
The first stage is the dismantling of the lighting lamp and the protective panel under the ceiling of the chamber. In models Biryusa the lampshade is often held on by latches or one screw. Carefully pry it up with a flathead screwdriver or remove the fastener. Under the lampshade you will find a plastic cover that hides the thermostat and the light button.
☑️ Preparing to disassemble the internal panel
Removing the panel itself requires caution. The plastic in old refrigerators becomes brittle and can crack if not handled carefully. Unscrew the visible screws and sequentially unclip the fasteners around the perimeter. After removing the panel, you will have access to the thermostat, which is usually mounted on a bracket or inserted into a special hole.
⚠️ Attention: When removing the inner panel, do not use excessive force. If the panel is not removable, check for hidden screws under the decorative plugs or in the lamp niche.
The thermostat in this location is usually connected to a capillary tube, which can be attached to the evaporator. Be extremely careful not to damage the thin capillary tube, as its depressurization will lead to a refrigerant leak and will require complex repairs with recharging the system.
Access to the thermostat on the rear wall
In cases where the thermostat is placed outside, the access process looks different, but also requires precautions. You will need to move the refrigerator away from the wall, allowing clear access to the rear of the unit. Make sure that the floor is level and you will not damage the flooring when moving heavy equipment.
The compressor is located on the rear wall, at the bottom. Above or next to it there is a metal or plastic casing that covers the start-up relay and thermostat. To remove the casing, it is usually enough to unscrew a few bolts around the perimeter. Use open-end wrenches or a socket of the appropriate size.
After removing the protection, you will see a black cylindrical compressor and next to it a small box with wires coming out - this is the thermostat you are looking for. Unlike the internal arrangement, here the capillary tube goes deep into the body through a special hole, often filled with sealant.
Check the condition of the wires going to the thermostat. They must not have traces of melting, oxidation or mechanical damage. If visually everything is in order, you can proceed to testing the contacts with a multimeter to identify the malfunction.
Diagnostics and signs of thermostat malfunction
Before changing the part, you need to make sure that this is the problem. There are a number of characteristic signs indicating a failure of the thermostat. The most obvious symptom is the failure of the compressor to turn on when there is a clear need for cooling, or, conversely, its continuous operation without shutting down.
For accurate diagnostics, use a multimeter in dial mode. Remove the wires from the thermostat contacts and connect the device probes to the terminals. At room temperature, the contacts should be closed (the device beeps). If you place the sensitive element in the cold (for example, in the freezer for 15-20 minutes), the contacts should open.
- 🔌 The compressor hums, but does not start, or the relay clicks - possible sticking of the thermostat contacts.
- ❄️ It is too cold in the refrigerator compartment, food freezes - the thermostat does not open the circuit when the temperature reaches low.
- 🌡️ The refrigerator does not turn on at all, although the light is on - there is an open circuit inside the thermostat or lack of contact.
- 💧 Frequent turning on and off of the motor (clocking) - incorrect operation of the sensitive element.
It is important to distinguish a thermostat malfunction from problems with the start relay or the compressor itself. If, when the thermostat contacts are closed directly (bypassing the regulator), the compressor starts and operates normally, then the problem is definitely in the temperature regulator.
⚠️ Attention: Briefly closing the contacts for testing is only permissible for diagnostics. It is strictly prohibited to leave the refrigerator working bypassing the thermostat - this will lead to defrosting or spoilage of food.
Replacing the thermostat: step-by-step algorithm
The process of replacing the thermostat in refrigerators Biryusa is technically simple, but requires attention to detail. After purchasing a new analogue (be sure to check the markings, capillary lengths and mounting locations), you can begin installation. The work is carried out with the device disconnected from the network.
First, dismantle the old thermostat, having previously photographed the wiring diagram. This will help avoid assembly errors. Carefully disconnect the terminals, being careful not to yank the wires sharply. If the thermostat is internal, remove the capillary tube from the evaporator, acting as carefully as possible.
Install the new thermostat into the seat. Secure it with fasteners. Connect the wires according to the photograph or color marking you took earlier. Usually standard colors are used, but it is better to double-check the diagram of a specific device.
Pay special attention to installing the capillary tube. It should be fixed in the same place and with the same tightness to the evaporator as the old one. Using an aluminum pad or a special clamp will ensure proper heat transfer. After assembling all the panels, turn on the refrigerator and check its operation for several hours.
Common mistakes during self-repair
DIY Repair of household appliances is always fraught with risks, and replacing a thermostat is no exception. One of the most common mistakes is purchasing the wrong regulator model. Thermostats differ in the length of the capillary tube, temperature range of operation and mounting method. Installing a “similar” regulator can lead to incorrect operation of the refrigerator.
Another mistake is damage to the capillary tube during installation. The thin copper tube is easily pinched or bursts if handled carelessly. If you hear the hissing of escaping gas, the process must be stopped immediately, since further operation is impossible without professional refilling.
Also, users often forget about grounding or do not secure the wires properly, which can lead to a short circuit or the appearance of extraneous noise (humming) when the compressor is operating. High-quality insulation of all connections and reliable fastening of elements is the key to the durability of the repair.
Recommendations for care and prevention
In order for the thermostat and the entire cooling system to last longer, it is important to follow the operating rules of the refrigerator Biryusa. Do not set the temperature to minimum unless necessary, as this causes the compressor to work harder and the thermostat to constantly switch. The optimal mode allows the equipment to rest.
Regularly defrost the refrigerator if your model is not equipped with a No Frost system. Ice buildup on the evaporator impairs heat exchange with the thermostat capillary, causing the sensor to “lie” and incorrectly control the cooling cycles. A thin layer of ice can cause the motor to start frequently.
Keep the rear wall and condenser clean. Dust and animal hair settling on the radiator impair heat transfer, which indirectly affects the operation of the entire system, including the thermostat. Wipe the door seals and check their fit, since a violation of the tightness causes the thermostat to work in increased mode.
Can I use a thermostat from another refrigerator?
The use of analogues is possible, but only if the technical characteristics completely match: capillary length, temperature range and type of fastening. Universal thermostats require complex settings and may not work correctly.
Why does the refrigerator not turn off after replacing the thermostat?
There may be several reasons: the new thermostat is faulty (defective), the capillary tube is installed incorrectly (poor contact with the evaporator), freon leakage or a malfunction of the compressor itself. Repeated diagnostics are required.
How long does the thermostat in the Biryusa refrigerator last?
The average service life of a mechanical thermostat is 7-10 years. Electronic sensors can work longer, but are more sensitive to power surges in the network.