The situation when the refrigerator stops cooling due to a break or burnt out wiring requires immediate intervention. Many owners of household appliances Atlas or Indesit try to solve the problem themselves, not fully understanding the electrical circuit of the unit. Connecting a cable to a compressor or thermostat is a process that requires precision and safety, as we are talking about 220 volts.
Before you get started, you need to make sure that you have basic electrical and tool skills. Improper installation can lead to a short circuit or failure of the expensive compressor. In this article, we will analyze in detail all the stages of replacing the wiring so that you can do the job efficiently.
Fault diagnosis and preparation of tools
The first step is always to accurately determine the location of the insulation break or damage. Often the problem lies not in the cable itself coming from the outlet, but in the internal connections start relay. For diagnostics, you will need a multimeter, which you need to ring the circuit from the plug to the terminal block.
If the circuit does not ring, a visual inspection will help identify blackened areas or melted plastic. In modern models Liebherr i Bosch wiring is often hidden in channels, so partial disassembly of the rear panel may be required. It is important not to damage the tubes cooling systems when dismantling the casings.
To carry out cable replacement work, prepare the following set of tools:
- 🔧 A set of screwdrivers (phillips and flat) for removing panels
- 🔪 Stationery knife or side cutters for stripping insulation
- 🔌 New power cable with a cross-section of at least 1.5 mm²
- 🧤 Dielectric gloves for protection against current
⚠️ Attention: Any work on Cable replacement should only be carried out when the power supply is completely disconnected from the network. Unplug the plug from the socket before disassembling!
Selecting a suitable cable and calculating the cross-section
The choice of conductor directly affects the operational safety and durability of refrigeration equipment. A standard household cable must withstand inrush currents, which at the moment of start electric motor can be several times higher than the rated ones. Using a wire that is too thin will cause it to heat up and possibly catch fire.
For most household refrigerators Samsung i LG, a double-insulated copper cable is suitable. Aluminum wires are not recommended for use due to their fragility and tendency to oxidize at contact points. The optimal choice would be a brand cable PVS or KG.
Main parameters that you need to pay attention to when purchasing:
- 🔢 Core cross-section: at least 1.5 mm², better 2.5 mm² for a safety margin
- 🌡️ Temperature range: the insulation must withstand heating up to +70°C
- 🛡️ Protection class: the presence of additional braiding against mechanical damage
Below is a table of correspondence between the cable cross-section and the permissible load power, which will help to avoid mistakes when choosing a material.
| Copper core cross-section (mm²) | Allowable current (A) | Maximum power (kW) | Recommended cable type |
|---|---|---|---|
| 0.75 | 6 | 1.3 | For low-power models |
| 1.5 | 15 | 3.3 | Standard for most refrigerators |
| 2.5 | 21 | 4.6 | For powerful two-compressor systems |
| 4.0 | 27 | 5.9 | Industrial equipment |
Connection diagram for the compressor and start relay
The most difficult step is the correct connection of the wires to the compressor terminals. The motor housing is usually marked with color codes or letters that cannot be ignored. An error in connecting the windings starter and work will lead to motor humming and subsequent burnout of the windings.
In the classic circuit, three contacts are suitable for the compressor: general, starting and working. The starting relay is connected to the starting winding and opens the circuit after a set of revolutions. The working winding is constantly energized while the thermostat is operating. It is important not to confuse the phase and zero at the input to the control circuit.
The sequence of actions when connecting is as follows:
- Remove the protective casing from the compressor and take a photo of the old circuit.
- Strip the ends of the new cable by 10-12 mm.
- Connect the wires to the relay terminals according to the color scheme.
- Fix the connections and check the reliability of the contact.
What to do if the colors of the wires do not match?
In older models of refrigerators, the color markings may differ from modern ones. Use a multimeter in continuity mode: the resistance between the starting and operating windings should be the sum of the resistances of each winding relative to the common wire.
Installation of the thermostat and internal wiring
The thermostat is a key control element that breaks the compressor power circuit when the set temperature is reached. When replacing the cable, it is important to correctly connect the thermostat contacts so that it responds correctly to changes inside the camera. Usually these are two or three contacts, depending on the model.
When laying the cable inside the case, make sure that it does not touch sharp metal edges or hot condenser tubes. Models Whirlpool and Electrolux often use special plastic clips to secure the wiring. Violation of the integrity of the insulation in this place can lead to leakage of current to the housing.
Basic rules for laying internal wiring:
- ⚡ Avoid bending the wire at an angle of 90 degrees
- 🔥 Do not allow the cable to come into contact with the defrost heating elements
- 🔩 Use standard holes and channels in the case
⚠️ Attention: If you change a mechanical thermostat to an electronic one, the connection diagram may be radically different. Check the technical documentation for the specific refrigerator model.
Grounding and safety of electrical appliances
The issue of grounding is often ignored during self-repair, but for a refrigerator it is critically important. The metal body of the device may become energized if the insulation breaks down. The presence of a grounding wire in the cable and a working outlet will protect the user from electric shock.
When connecting the cable, make sure that the third wire (usually yellow-green) is securely connected to the refrigerator body in a specially designated place. In old houses without grounding, it is recommended to use UZO (residual current device) at the entrance to the apartment.
Checking the quality of grounding:
- 📏 Visual inspection of the integrity of the grounding conductor
- 🔌 Checking the presence of "ground" in the socket with an indicator
- 🧪 Measuring the resistance of the ground loop (if devices are available)
Compliance with electrical safety rules when working with refrigeration equipment is not just a formality, but a necessity. Any contact of electricity with moisture, which can form during defrosting or condensation, creates a dangerous situation.
Checking functionality after installation
After the cable is connected and all connections insulated, food cannot be loaded immediately. It is necessary to conduct a test run of the system. Plug in the refrigerator and listen to the sound of the compressor starting: it should be smooth, without buzzing or clicking.
Check the cable heating at the connection points after 15-20 minutes of operation. If the wire is hot, it means the contact is bad or the cross-section is selected incorrectly. It is also worth checking the operation of the thermostat: it should turn off the motor when the temperature is reached.
Checklist of actions after assembly:
- 👂 Listen to the operation of the compressor for extraneous noise
- 🌡️ Check the cycle of turning on and off the refrigerator
- 👐 Make sure there is no heating of the wiki and cable
- 🧊 Assess the quality of cooling after 2-3 hours
⚠️ Attention: Technical specifications and connection diagrams may vary depending on the manufacturer and year of manufacture of the model. Always check the official instructions or the sticker on the compressor body.
☑️ Final check
Properly executed cable installation guarantees stable operation of your refrigerator for many years. Do not skimp on the quality of materials and pay attention to detail when assembling.
Can an extension cord be used for a temporary connection?
An extension cord can only be used as a last resort and only if it is designed for a power of at least 3.5 kW. Constant use of an extension cord is not recommended, since the connection between the plug and the socket can get hot.
What should you do if, after connecting, the refrigerator hums, but does not start?
Most likely, the contacts of the starting and working windings are mixed up, or the starting relay has failed. It is necessary to immediately turn off the device and recheck the connection diagram.
Do you need to solder the wires or is twisting enough?
Twisting at the connection points to the compressor is unacceptable due to vibration and heating. Use soldering or special terminal blocks for reliable contact.