Repair of refrigeration equipment often begins with a visual inspection and diagnosis of electrical circuits, which requires access to the internal components of the motor. Removing the compressor protective casing is the first and critically important operation that any master or home craftsman who decides to independently restore equipment should be able to perform. Protective casing hides the starting relay, thermal relay, capacitors and terminal block, providing insulation of live parts and protection from mechanical damage.
However, before proceeding with disassembly, it is necessary to clearly understand the risks associated with high voltage and residual refrigerant pressure in the system. Improper handling of tools can result in damaged copper tubing or electrical shock, so site preparation and the availability of appropriate tools are critical to the success of the operation. In this article, we will analyze in detail all the stages of dismantling the cover, design features of various models and precautions that cannot be ignored.
Modern refrigerators, be they classic models Atlant or complex inverter systems LG, have a similar layout of the lower part, but may differ in the type of fastening of the elements. Understanding the physical principles of the assembly and casing design will help you avoid fatal mistakes that can turn a minor repair into an expensive replacement of the entire unit. Let's look at what tools will be needed and how to properly organize the process.
Preparation of the workplace and necessary tools
High-quality preparation for repairs is the key to safety and maintaining the integrity of expensive equipment. Before tilting or turning the refrigerator over, you must clear the space around it, allowing easy access to the back wall from all sides. You will need stable lighting, since dust and dirt often accumulate in the lower part of the case, hiding small parts and fasteners.
To perform work on removing the casing, you will need a minimum set of tools, which can be found in the arsenal of most home craftsmen. The main tool will be a flat-head and Phillips screwdriver, as well as pliers for working with clamps and clamps. In some cases, a socket wrench or 8 or 10 mm socket may be required if the casing is secured with bolts, which is typical for industrial or heavy household models.
- 🔧 Screwdrivers: flat (blade width 4-6 mm) and Phillips (PH1, PH2) for screws of different calibers.
- 🔨 Pliers or pliers: required for removing spring clamps and clamps.
- 🧤 Dielectric gloves: provide additional protection when working with electrical components.
- 🔦 Flashlight: for illuminating hard-to-reach areas at the bottom of the unit.
It is recommended to use a tool with dielectric handles that have been tested for the integrity of the insulating layer. Also prepare a container to collect small parts, such as screws and washers, so that they do not get lost on the floor or carpet.
⚠️ Attention: Before starting any work, be sure to unplug the refrigerator from the electrical outlet! Unplug the plug from the socket and make sure there is no voltage at the terminals. Residual charge in capacitors can be dangerous, so do not touch live parts with bare hands immediately after disconnecting.
Particular attention should be paid to the condition of the floor at the work site. If you plan to tilt the refrigerator, place thick cardboard or soft cloth underneath it to avoid scratching the floor covering or damaging the legs of the unit. A heavy compressor, when the center of gravity shifts, can create a dangerous situation, so carry out all manipulations with tilting the housing carefully, preferably with an assistant.
☑️ Preparing to remove the casing
Design of the compressor protective casing
The protective casing, often called simply a “lid” or “cap,” is a metal container, covering the top and sides of the compressor. Its main function is to protect the electrical part of the motor-compressor from moisture, dust and mechanical influences, as well as reduce the noise level during operation of the unit. Structurally, casings are divided into stamped metal and plastic, and the latter are more often found in modern models of refrigerators.
Metal casings are usually attached to spring clips or screws and have the shape of an inverted glass or box. Inside such a casing there is often a start-up relay, which is placed directly on the compressor terminals. Plastic covers can be composite, consisting of several parts fastened together, or they can be a monolithic element fixed on the motor housing.
A capacitor necessary for engine operation, especially in models with asynchronous motors, can also be located inside the casing. Understanding what is under the cover helps the technician plan his actions in advance and avoid pulling unnecessary wires. In some designs, additional thermal insulation or noise-absorbing materials are also hidden under the casing.
It is worth noting that in inverter compressors the design may be different: they often use a single electronic control unit integrated into the housing or located nearby, and access to it may require removing not only the casing, but also part of the rear panel of the refrigerator. Design details may vary depending on the manufacturer and year of manufacture of the model.
ℹ️ Information: The design and arrangement of elements may vary depending on the model and manufacturer of the refrigerator. Always check the technical documentation or diagram of the specific device, if available, to know exactly the location of the fasteners.
The tightness of the casing is an important parameter that prevents condensation from entering hot electrical contacts. When removing the cover, it is important not to damage the sealing gaskets, if they are provided for in the design, since their violation can lead to accelerated corrosion of the contacts in the future. In older models, the casings could be completely removable, while new ones often have a complex system of latches.
Why are casings made of metal?
The metal casing acts as a radiator, removing some of the heat from operating electrical components, and also shields electromagnetic interference created by the motor and relay, preventing it from affecting other electronics in the home.
The process of dismantling the casing: step-by-step instructions
The process of removing the cover begins with gaining access to the rear lower part of the refrigerator. To do this, the unit must be carefully tilted forward, resting the upper part against the wall or asking an assistant to hold the body. Make sure that the refrigerator is stable and will not fall on your feet or back during operation.
The first step is to inspect the perimeter of the casing. Locate the mounting points: these could be screws on the sides, top, or special spring clips that go around the compressor housing. If you see screws, use a suitable screwdriver to remove them, placing the fasteners in the prepared container. Do not use excessive force to avoid stripping the threads, which can be weakened by vibration.
In the case of spring clamps, which are common on many models, it is necessary to use pliers. Gently squeeze the "ears" of the clamp and slide it down or to the side to release the housing. Proceed sequentially, removing the clamps in a circle, so as not to distort the cover and damage the wires inside. After removing all the fasteners, the casing can be removed upwards or to the side, depending on the design.
- 🔍 Inspect the fasteners: determine the type of fixation (screws, latches, clamps).
- 🔧 Remove the fasteners: unscrew the screws or press out the spring clips with pliers.
- 👐 Carefully remove the casing: avoid sharp jerks so as not to damage the wires.
- 🧹 Clean the insides: remove dust and spiders from the surface of the compressor and relay.
When removing the casing, be extremely careful about the wires going to the start relay and thermostat. They can be short and taut, so a sudden movement can cause them to break at the very base. If the wires interfere with removal, they do not need to be disconnected immediately - first evaluate whether you can simply carefully move them to the side.
After the casing is removed, you will have access to the electrical part of the compressor. Do not rush to touch relays or capacitors right away. Let the motor cool down if it has been running recently, and again visually assess the condition of the contacts for oxidation, carbon deposits or traces of melting. It is these signs that often indicate the cause of a refrigerator malfunction.
Diagnostics and maintenance of internal components
By opening access to the insides of the compressor, the technician has the opportunity to carry out initial diagnostics equipment condition. A visual inspection can reveal obvious defects: a blackened start relay often indicates its combustion, and melted wires indicate an overload or poor contact in the circuit. Particular attention should be paid to the capacitor: swelling of the housing or leakage of electrolyte requires immediate replacement of the element.
Cleaning the internal surfaces is an important part of maintenance. Over the years of operation, a layer of dust mixed with oil and moisture accumulates under the casing, which can create conductive paths and lead to short circuits. Use a dry, soft brush or compressed air to remove contaminants, being careful not to damage the fragile plastic parts of the relay.
Checking that the wires are securely attached to the terminals is another critical step. Loose contacts heat up and spark, which can cause a fire or compressor failure. If you notice oxidation on the contacts, gently sand them with fine-grit sandpaper or a special contact spray, but be careful not to short out adjacent terminals.
If you plan to replace the start relay or capacitor, now is the time to prepare new parts. Make sure that the parameters of the new elements (power, capacity, voltage) exactly match the requirements of your compressor. The use of unsuitable components can lead to unstable operation of the refrigerator or repeated breakdown in the shortest possible time.
In some cases, traces of oil can be found under the casing, which is an alarming signal indicating a violation of the system's tightness. If you see oily spots on the casing or around the compressor terminals, this may indicate a freon leak through microcracks or a leaking seal. In such a situation, simply replacing the relay will not be enough - more serious repairs will be required with the participation of a refrigeration equipment specialist.
Typical mistakes and safety precautions
When dismantling the compressor casing, beginners often make mistakes that can be costly. One of the most common mistakes is using excessive force when removing clamps or trying to pull the casing off. The compressor metal and copper tubes are quite soft and can be easily deformed or damaged, which will lead to depressurization of the system and leakage of refrigerant.
Another common mistake is ignoring electrical safety rules. Even after unplugging, capacitors may retain a charge that can cause an unpleasant electric shock. In addition, accidentally closing the contacts with a tool while the refrigerator is turned on (for testing) can lead to a short circuit and failure of the wiring or the compressor itself.
You should also not forget about the temperature regime. Attempting to remove the casing or relay immediately after the compressor is running while it is hot may result in burns to your hands. Allow the unit time to cool to room temperature before starting active operations. Also avoid working in conditions of high humidity, as water is an excellent conductor of electricity.
It is important to correctly identify the type of compressor you have before starting work. Inverter models require special care when working with electronics, as static electricity can damage sensitive control chips. In such cases, it is recommended to use an antistatic wrist strap or at least touch grounded metal objects before touching electronic components.
⚠️ Warning: Never attempt to solder pipes or electrical connections while under pressure or without the proper equipment to remove freon. This may result in an explosion or fire.
Using unsuitable tools, such as a knife or chisel, to pry the lid is also unacceptable. A sharp tool can slip and pierce copper tubing or damage the insulation of the compressor windings. Always use the tool intended for this purpose and act methodically, without haste or fuss.
Table: Comparison of types of fastening of casings
Different manufacturers use different methods of fastening protective casings, and knowledge of these differences helps to perform dismantling faster and safer. Below is a table comparing the main types of fastenings and their features.
| Type of fastening | Tool | Difficulty of removal | Risks |
|---|---|---|---|
| Spring clamps | Pliers | Medium | Tool slipping, risk of hitting the tubes |
| Screw connection | Screwdriver/Wrench | Low | Thread breakage, loss of screws |
| Plastic latches | Plastic spatula | High | Fragility of plastic, destruction of fasteners |
| Combined type | Tool set | High | Combination of the above risks |
Analysis of the table shows that the most difficult to maintain are structures with plastic latches, which over time lose their elasticity and become brittle. When working with such models, special delicacy is required and, possibly, heating the plastic with a hairdryer to increase its ductility, although the latter method should be used with extreme caution.
The screw connection is considered the most reliable and convenient for repair, as it allows you to repeatedly remove and install the casing without the risk of damaging the fasteners. However, screws can rust, especially in conditions of high humidity, so it is recommended to periodically treat them with a penetrating lubricant.
Assembly and final stage of work
After diagnostics, cleaning or replacement of faulty components, the assembly stage begins. Reinstall the casing, making sure that it fits correctly and does not distort the internal elements. The wires should lie freely, without tension or kinks, and not touch the hot parts of the compressor or moving mechanisms, if any.
Fix the casing in the chosen way: install and tighten the screws or snap the spring clamps until a characteristic click is heard. Check the secure fit by slightly shaking the casing with your hand - it should not dangle or make rattling sounds. Rattling sounds may indicate that the clamp is not fully latched or one of the fastening elements is missing.
After installing the casing, carefully inspect the entire work area again. Make sure there are no forgotten tools, rags or extra parts on or around the compressor. The presence of foreign objects can cause vibration, noise or even a short circuit when the refrigerator is turned on.
Only after a thorough check can you begin to plug in the refrigerator. Turn on the unit and listen to the compressor. The sound should be smooth, without extraneous knocks, creaks or buzzing. If successful, the refrigerator will begin to gain temperature, and after some time cold will appear in the chambers.
During the first hours of operation of a new or repaired refrigerator, it is recommended to periodically check the heating temperature of the compressor and casing. Excessive heat may indicate improper assembly, a faulty relay, or problems with the cooling system. If you notice anomalies, immediately turn off the device and re-diagnosis.
Frequently asked questions (FAQ)
Is it possible operate the refrigerator without a protective casing?
Operating a refrigerator without a protective casing is highly not recommended. The casing protects electrical parts from moisture, dust and mechanical damage, and also reduces noise levels. Operating without it can result in a short circuit, electric shock, or rapid failure of the compressor.
What to do if the casing screws are rusty and cannot be unscrewed?
If the screws are rusty, try treating them with a penetrating lubricant (for example, WD-40) and leave for 10-15 minutes. After that, carefully try to unscrew it again. Do not use excessive force to avoid stripping the screw head. As a last resort, you can use heating, but with caution.
How often should you remove the casing for preventive maintenance?
There is no need to remove the casing for preventive maintenance unless necessary. Once every few years is enough for general cleaning of dust if the refrigerator is in a dusty room. Frequent disassembly can lead to wear of fasteners and loss of tightness.
Is it dangerous to touch the compressor immediately after removing the casing?
Yes, it is dangerous. The compressor becomes very hot during operation. Before removing the casing and any manipulations inside, you must allow the refrigerator to cool completely to avoid thermal burns to your hands.
Is it possible to replace the casing with an analogue from another model?
Theoretically, it is possible if the dimensions and shape match, and the fasteners are suitable. However, it is better to use original spare parts or exact analogues, since a non-standard casing may not provide adequate protection or create vibration and noise.