If your refrigerator Sviyaga stops freezing, but the light is on inside, and the compressor is either silent or making humming and clicking noises, most likely the problem lies in the trigger mechanism. It is starting relay responsible for starting the engine, supplying the necessary impulse to the starter windings. In old Soviet-made models, which include most units of this brand, this unit often fails due to natural wear and tear or power surges.
It is not difficult to find this element, since the design of these refrigerators is simple and maintainable. You do not need to disassemble the entire housing or dismantle the unit completely - the unit is accessible from the rear. However, before starting any manipulations, it is necessary to strictly observe safety precautions, since we are talking about working with electrical components under high voltage.
In this article we will analyze in detail what exactly the relay looks like, where it is located on the compressor and how to diagnose it. We will look at typical signs of breakdown, the algorithm for dismantling and replacing parts, and also answer frequently asked questions from equipment owners Sviyaga. Correct diagnostics will help you save time and money by avoiding calling a technician for a simple operation.
Design and principle of operation of the starting device
Starting relay in refrigerators Sviyaga, such as models ZIL-MHM-130 or KSh-260, is a compact plastic case containing an electromagnetic mechanism inside. The main elements are a movable core, contacts and, in some modifications, thermal protection. When voltage is applied to the engine, the current passes through the relay winding, creating a magnetic field that draws in the core and closes the contacts of the compressor starting winding.
After the motor rotor reaches the required speed, the current in the starting winding drops, the magnetic field weakens, and the core, under the influence of gravity (or a spring), returns to its original position, opening the circuit. If this process is disrupted, the compressor cannot start. Thermal relay, often built into the same housing as the starting one or located next to it, serves as a fuse: it opens the circuit when the motor windings overheat or if the start takes too long, preventing the motor from burning out.
It is important to understand that in refrigerators Sviyaga relays of the RTP (Three-Phase Starting Relay) or RT (Thermal Relay) type, which are universal for many Soviet compressors, were most often used. The original relays were marked with an index corresponding to the power of a particular compressor, for example, 1.3 or 1.4which is critically important to consider when selecting a replacement. An incorrectly selected device may not start the motor or, conversely, not turn off the starting winding, which will lead to overheating.
⚠️ Attention: Internal contacts relays may be coated with carbon deposits or oxide. A visually intact case does not guarantee the functionality of the device - an electrical test with a multimeter is required.
The operating principle is based on the physics of electromagnetism, where the slightest change in winding resistance or mechanical jamming of moving parts leads to failure of the entire cooling system. That is why during repairs they often change the entire assembly, since restoring contacts inside a sealed or semi-hermetic housing is labor-intensive and not always effective.
The exact location of the relay on the compressor
To find the relay, you need to go to the back wall of the refrigerator Sviyaga. The compressor (black metal “tank”) is located in the lower niche. On the side of the compressor, at the exit point of three copper tubes and an electrical connector, is the required unit. The starting relay is placed directly on the terminals of the motor windings and is fixed either with a metal bracket, or simply sits tightly on the contact group.
A wiring harness coming from the thermostat and the power plug is suitable for this block. Often the relay is enclosed in a plastic or metal casing that is secured with screws or latches. Depending on the year of manufacture of the model Sviyaga, the fastening design may differ slightly, but the logic of location remains the same: the relay is always located in close proximity to the compressor terminals.
- 🔍 Visual inspection: Look for a black or gray plastic box measuring approximately 5x5 cm, placed on the pins on the side motor.
- 🔌 Electrical connection: The relay must be approached by wires from the capacitor (if there is one in the circuit) and from the thermostat.
- 🛡️ Protective casing: Pay attention to the presence of a metal plate or plastic cover covering the contacts - they are necessary remove for access.
If you see that the relay is loose or the wires fit loosely to it, this may be a sign of a previous poor-quality repair. In normal mode, the device should fit tightly. Sometimes the relay may be hidden under a layer of dust or cobwebs, so thorough cleaning of the back panel before inspection is required.
Fault symptoms and initial diagnostics
Before removing the relay, you should make sure that it is the problem. A characteristic sign of a faulty starting device is the cyclic turning on and off of the compressor. You may hear a click, a hum from the motor for 2-5 seconds, and then another click and silence. This works thermal protection, turning off the engine to avoid overheating, since the starting phase does not complete successfully.
Another symptom may be the complete silence of the unit when the light in the chamber is on. If the thermostat clicks, trying to start the cycle, but the compressor does not respond, there is a high probability of an open circuit in the trigger mechanism. Also, a malfunction may be indicated by the smell of burnt plastic or wiring in the compressor compartment area.
For a more accurate diagnosis, you can gently shake the removed relay near your ear. If a rattling sound is heard inside, as if from a broken part, it means the core or contacts are damaged. In good condition, when shaking, only a dull, quiet knock of the moving elements is heard, but not a ringing.
⚠️ Attention: If after replacing the relay the situation repeats, the problem may be in the compressor itself (interturn short circuit of the windings). Prolonged attempts to start with a faulty relay can permanently damage the motor.
It is also worth checking the condition of the wires leading to the relay. Melted insulation or blackened contacts indicate a poor connection or overload. In such cases, simply replacing the relay may not help - you will need to clean the contacts and, possibly, replace the terminal block.
Instructions for dismantling and replacing the relay
The process of replacing the start relay in the refrigerator Sviyaga is technically simple, but requires care. The first and most important step is to completely disconnect the refrigerator from the power supply. Unplug the plug from the socket and make sure that access to the rear panel is not restricted in any way.
☑️ Preparing to replace the relay
Next you need to remove the fixing bracket or screw holding the relay to the compressor housing. Carefully remove the plastic casing. Before pulling the relay off its pins, it is highly recommended that you take a photo of the wire location. Although it is difficult to confuse them due to the different shapes of the terminals, visual fixation will help to avoid mistakes. Remove the wires from the relay contacts by gently rocking them from side to side.
The relay itself is removed by gently rocking left and right and down. Do not use excessive force to avoid damaging the compressor terminals. Install the new part in the reverse order: put it on the terminals, connect the wires according to the diagram, secure with a bracket. Make sure that the relay sits tightly and does not loosen.
| Working stage | Action | Important detail |
|---|---|---|
| 1. Preparation | Disconnection from the network | Safety comes first |
| 2. Access | Removing the compressor casing | Use a screwdriver |
| 3. Dismantling | Disconnecting wires | Remember or photograph the diagram |
| 4. Installation | Installation of a new relay | Controlling the tightness of the pins |
After assembly, turn on the refrigerator. It is normal for the compressor to start within the first minute. If the engine runs smoothly, without humming and subsequent shutdown, the replacement was successful. Let the unit operate for 15-20 minutes and check whether the evaporator inside the chamber begins to cool.
Checking the serviceability of the removed relay with a multimeter
If you have a multimeter on hand, you can accurately determine whether the removed relay is working properly or whether it requires replacement. To do this, switch the device to resistance measurement mode (Ohms). First check the circuit between the input terminal and the terminal going to the start winding. In the initial position (the relay lies vertically), the resistance should be infinite (break).
Then turn the relay 180 degrees (simulation of switching on). In this position, the contacts should close and the multimeter will show a resistance close to zero (usually less than 1 ohm). If the device shows "1" or infinity in both positions, it means that the contacts are burnt out or stuck, and the relay is faulty.
Also check the thermal protection (bimetallic strip), if it is built into the housing. Ring the contacts of the thermal relay - they should ring (show zero). If there is a “break”, it means that the protection has burned out and requires replacement along with the trigger mechanism. Often there are kits on sale where the starting and thermal relays are combined or sold in pairs.
What to do if you don’t have a multimeter?
You can assemble a simple circuit from a 1.5V battery and a light bulb. Connect the circuit to the relay contacts. When the relay is turned over, the light should light up and go out. If the light is constantly on or does not light up at all, the relay is faulty.
Do not forget that even if the contacts ring, the mechanical part may not work correctly. Therefore, if the refrigerator is old and the relay has been in use for decades, replacing it with a new one preventively is a more reasonable solution than trying to resuscitate the old one.
Choice of an analogue and compatibility of parts
Refrigerators Sviyaga were equipped with compressors from different factories, so the relays may differ in power and design fastenings The most common are series relays RTK, RTP, R-1, R-3. When purchasing an analogue, pay attention not only to the appearance, but also to the markings on the body.
The key parameter is the rated current or power of the motor. If you install a relay rated for less power, it will click constantly and quickly fail. If it is large, the starting winding may not open, which will lead to the compressor burning out. The table below will help you navigate the main types.
- ⚙️ RTK-1-3: Often found in medium-sized refrigerators, works with compressors up to 1/4 hp.
- ⚙️ RTP-1: More modern version, often has separate thermal protection, mounted on frame.
- ⚙️ PZR (Start-up protection relay): Universal modern analogues that are suitable for many models with the correct selection of the current characteristics.
In modern spare parts stores, original Soviet relays are difficult to find, but their functional analogues (for example, manufactured Danfoss or Chinese universal kits) work no worse. The main thing is the coincidence of the current characteristics and the type of connection (2 or 3 contacts).
⚠️ Attention: Universal relays may require position adjustment or have additional wires. Carefully read the instructions for the universal kit before installation.
Frequently asked questions (FAQ)
Is it possible to start a Sviyag refrigerator without a relay?
Theoretically, you can start a compressor without a starting relay by artificially closing the contacts of the starting winding for a short time when turning it on, but this is extremely dangerous and is not recommended. Without thermal protection, the compressor can burn out in a few seconds if the start is unsuccessful. This is a temporary measure only for diagnostics, but not for operation.
Why does the new relay click, but the refrigerator does not freeze?
If clicks are heard, but the compressor does not start (does not hum), the compressor itself may be faulty (jammed) or the thermal protection has burned out. If the compressor hums, but does not start and after a few seconds it clicks, it is possible that a relay with the wrong current characteristic was selected or it is defective.
How often do you need to change the starting relay?
The service life of the relay is not strictly regulated; it changes upon failure. In old refrigerators Sviyaga the resource can be 10-15 years or more. Frequent replacement may indicate problems with the voltage in the network or unstable operation of the compressor.
Where to buy an original relay for Sviyaga?
Original relays from the times of the USSR can now only be found at dismantling sites or in “old spare parts” stores. However, modern analogues (RTP, RTK, PZR) are fully functional and are available in spare parts stores for household appliances or on radio markets.