Owners of legendary Soviet refrigerators Zil often face a situation when the compressor stops starting or makes a characteristic click, after which it is silent. In most cases, the cause of the breakdown is the failure of the starting relay, which is responsible for starting the engine. Understanding where exactly this element is located is the first step to successfully restoring the unit's functionality.
Finding a relay does not require complex equipment, but knowledge of the design of older models greatly simplifies the task. Start relay in refrigerators of this brand it is usually mounted directly on the side of the compressor, hidden by a casing or protective cover. To access it, you do not need to disassemble the entire body of the refrigerator; it is enough to dismantle the back panel.
In this article we will analyze in detail the algorithm of actions that will help you safely get to the required part, check its condition and, if necessary, replace it. It is important to observe safety precautions, since work is carried out on live electrical components. Let's look at the design and location of the unit in more detail.
Location of the relay in the refrigerator design
To understand where the relay is located, you need to imagine the general layout of the refrigeration unit. In Zilmodels, as in most classic two-chamber refrigerators, the compressor unit is located in the lower rear part of the body. It is there, in a niche hidden by a metal or plastic panel, that the “heart” of the system is located.
Start-protective relay is attached directly to the compressor terminals. It is a small plastic or metal block that fits onto three contact pins extending from the motor housing. In older models, the relay can be enclosed in a separate metal cup, which is additionally secured with a clamp or latches.
Visually, this element is easy to distinguish from other parts. It is rectangular or cylindrical in shape and is often colored black or gray. Wires from the thermostat and the electrical network are suitable for it. If you see a box placed directly on the side of the engine, you have found what you were looking for.
Preparation for dismantling and safety precautions
Before starting disassembly, you must completely disconnect the refrigerator. Unplug the power cord from the outlet. This is a critically important stage, since even after switching off, a residual charge may remain in the capacitors, and accidental contact with live parts is life-threatening.
For work you will need a minimum set of tools. A flathead and Phillips screwdriver, as well as pliers, are usually sufficient. If the back panel is attached with self-tapping screws, they need to be unscrewed. In some modifications Zil the panel can be held on by latches that require careful release.
⚠️ Attention: Never try to remove the relay or other parts of the compressor while the refrigerator is plugged in. The risk of electric shock when working in the engine compartment is extremely high.
Inspect the area around the compressor. There may be a lot of dust and cobwebs that have accumulated over years of use. Before starting work on replacing the relay, it is recommended to carefully clean the area around the motor so that small debris does not get inside the electrical contacts.
Instructions for removing the starting relay
The process of dismantling the relay in refrigerators Zil is quite simple, but requires care. After removing the back panel you will see the compressor with the relay attached to it. Depending on the year of manufacture of the model, the mounting method may differ slightly.
If the relay is covered with a metal casing, it must be removed. The casing can be held on by a spring clamp or a screw. Loosen the fastening and remove the protection. Next, you should disconnect the wires going to the relay. They can be soldered or connected through connectors.
- 🔌 Disconnect the block with wires from the relay body by carefully pulling it towards you.
- 🔧 If the wires are soldered, use a soldering iron to carefully unsolder them, having first marked each wire.
- 🖐️ Remove the relay itself from the contact pins of the compressor, rocking it from side to side.
- 🧹 Clean the compressor contacts from oxides before installing a new part.
Sometimes the relay can “stick” to the contacts due to heat and time. In this case, do not use excessive force to avoid breaking the ceramic insulators or the compressor terminals themselves. It is better to slightly warm up the plastic case with a hairdryer or carefully pry it off with a flat screwdriver.
☑️ Check before installation
Diagnostics and signs of malfunction
How to understand that the problem is in the relay, and not in the compressor itself? There are several characteristic signs indicating a malfunction of this element. Most often, the refrigerator stops freezing, and the engine does not start.
One of the most obvious symptoms is a characteristic click when trying to start, followed by a pause, and the process repeats. This means that the relay is trying to start the motor, but cannot hold the circuit or opens it due to overload. Also, the relay may simply not close the starter circuit.
For accurate diagnostics, you can use a multimeter. In operating condition, the resistance of the coil and contacts should be zero or close to it. If the device shows an open circuit or, conversely, a short circuit where it should not be, the part requires replacement.
Why does the relay burn out?
A frequent cause of relay failure is unstable voltage in the network or frequent power surges. Also, the breakdown is caused by the natural wear of the bimetallic plate inside the device, which over time loses its properties and ceases to respond correctly.
Table of compatibility and characteristics of the relay
When looking for a replacement, it is important to consider the type of compressor and the parameters of the relay itself. In refrigerators Zil various engine modifications were used, so there is no universal part “for everyone”. Below is a table with approximate parameters.
| Relay type | Compressor model | Voltage | Features |
|---|---|---|---|
| RTK-X | HK-75, XK-85 | 220V | Vertical installation |
| R-3 | DH-2, DH-3 | 220V | Horizontal installation |
| R-4 | DH-4, DH-5 | 220V | With overload protection |
| PZR | Universal | 220V | Modern analogue |
Pay attention to the markings on the case old relay. Numbers and letters will tell you which model is installed in your unit. If the marking is erased, focus on the appearance and number of contacts.
Installing a new relay and checking operation
Installing a new part is done in the reverse order of removal. Push the relay onto the three pins of the compressor as far as it will go. Make sure it fits snugly and doesn't wobble. After this, connect the wires according to the photographs or diagram taken earlier.
Polarity in this case it does not play a role for most models, since the relay operates on alternating current, but it is important to correctly connect the grounding, if it is provided for in the design. Secure the protective cover and put the back panel in place.
After assembly, turn on the refrigerator. The compressor should start with a characteristic hum. After some time (10-15 minutes), check whether the condenser grille at the back of the refrigerator begins to heat up and whether cold appears in the chamber.
Frequent errors when replacing
When making repairs on their own, beginners often make mistakes that can lead to repeated breakdowns. One of the most common is installing the wrong type of relay. Even if the part physically falls into place, its electrical characteristics may not match the engine.
Another mistake is ignoring the state of the contacts. If you install a new relay on oxidized or burnt compressor terminals, it will quickly fail. Always clean the contacts with fine sandpaper before installation.
- ❌ Trying to repair a burnt out relay by stripping the contacts is a temporary measure that rarely produces long-term results.
- ❌ Installing the relay upside down or in the wrong position if the design does not allow for this.
- ❌ Using a relay from a different type of compressor without checking the coil parameters.
Remember that start relay is a consumable item. Its resource is limited by the number of on and off cycles. If your refrigerator is more than 15 years old, preventative replacement of this part can save the compressor from more serious problems.
⚠️ Attention: If the refrigerator makes a loud noise or knocking after replacing the relay, turn it off immediately. This may indicate a mechanical malfunction of the compressor, which cannot be ignored.
Questions and answers (FAQ)
Is it possible to start a ZIL refrigerator without a relay?
Theoretically, you can start a compressor without a starting relay using an external starting device or a button, but It is strictly forbidden to operate the refrigerator in this mode. This will lead to overheating of the windings and combustion of the motor in a matter of minutes.
Where to buy a relay for an old Zil refrigerator?
New original relays are no longer produced, but they can be found in spare parts stores for household appliances, on radio markets or ordered through online platforms by searching for “RTK relay” or “R-3 relay”. Universal analogues are also suitable.
Why does the relay heat up during operation?
Slight heating of the relay body is normal, since current passes through it. However, if the case becomes too hot (you cannot touch it with your hand), this is a sign of faulty contacts or a mismatch in the parameters of the compressor power relay.
How much does it cost to replace the relay in the service?
The cost consists of the price of the part itself and the work of the technician. Since the replacement process takes a little time, the main part of the amount is the cost of a specialist visit and diagnostics. Self-replacement saves up to 70% of costs.