Copper tubes in the refrigerator: where are they located and why are they needed?

Copper tubes are the “circulatory system” of the refrigerator through which refrigerant (freon) circulates. Without them, it is impossible to maintain low temperatures in the chambers. But where exactly are they laid, and is it possible to see them without disassembling the equipment? This article will help you understand the structure of the refrigeration circuit, identify signs of problems with the tubes and understand when a technician’s intervention is required.

Many users first think about the location of copper tubes when the refrigerator begins to freeze poorly or a suspicious noise appears. Others - when trying to clean the back wall yourself or move the unit. Important: copper tubes are not only hidden behind the panels, but are also extremely vulnerable to mechanical damage. Even a small dent can lead to freon leakage and equipment failure.

In this article we will look in detail at:

• 🔍 Where exactly do the copper tubes go in different types of refrigerators (compressor, inverter, with the No Frost system).
• 🛠️ How to independently inspect accessible sections of tubes without disassembling.
• ⚠️ Signs of damage and when urgent repairs are required.
• 📏 Table of standard tube diameters for popular models.

1. Design of the refrigeration circuit: the role of copper tubes

Copper tubes in the refrigerator are part a closed refrigerant circulation systemwhich includes:

• 🔄 Compressor —the “heart” of the system, compressing freon and forcing it move.
• ❄️ Condenser (usually on the back wall) - here the gas cools and turns into a liquid state.
• 🧊 Evaporator (inside the chambers) - absorbs heat, due to which cold is formed.
• 🔗 Filter-drier —cleanses the refrigerant from moisture and impurities.

Copper tubes connect all these elements, ensuring tightness and heat transfer. Copper is used because of its high thermal conductivity (398 W/m K) —it is 7 times more efficient than steel and 1.5 times - aluminum. In addition, copper is resistant to corrosion and can be easily soldered during repairs.

In modern refrigerators, tubes are divided into two types:

• 🟤 Thick (high pressure) —they go from the compressor to the condenser. Diameter: 4–6 mm.
• 🔵 Thin (low pressure) —from the condenser to the evaporator. Diameter: 2–3 mm.

2. Where are the copper tubes located: diagram for different models

The location of the tubes depends on refrigerator type i manufacturer. Below are typical diagrams for popular designs.

Classic compressor refrigerators (for example, Atlant, Biryusa, Samsung RT-series):

• 🔧 Rear wall: here passes condenser a coil of copper tubes (often black in color due to oxidation). The tubes run vertically or horizontally, attached to the grille.
• 🚪 Upper part of the case: thin tubes low pressure go up to the evaporator (in the freezer).
• ⚙️ Lower part: thick high pressure tubes connect the compressor (bottom back) to the condenser.

Refrigerators with No. Frost (LG GA-B489, Indesit DF 4180):

• ❄️ The tubes are hidden behind plastic panels inside the chambers. The evaporator is located behind the back wall of the freezer.
• 🌀 The fan distributes the cold, so the copper tubes are shorter, but thinner (diameter 2–2.5 mm).

Inverter models (Samsung RB37J5240, Hitachi R-B490PUC6):

• 🔄 The tubes are thinner (saving copper), but there are more of them due to the complex trajectory for uniform cooling.
• 📉 The compressor works continuously, so the high-pressure tubes heat up more (up to 60–70°C).

Where to look for tubes in Side-by-Side refrigerators?

In models Side-by-Side (for example, Samsung RS62R5001M9) copper tubes run:

- On the sides of the body (right and left) - additional condensers are often located here.

- Below between the chambers - two evaporators are connected (for the refrigeration and freezing zones).

- Behind the decorative panel on the ceiling there are thin low-pressure tubes.

3 How to inspect copper tubes without. disassembling the refrigerator

Full access to the tubes is only possible during disassembly, but partial inspection will help identify obvious problems. Here's what you can do:

Step 1. Inspect the back wall

• 🔦 Unplug the refrigerator and move it away from the wall.
• 🕵️‍♂️ Inspect the condenser coil with a flashlight. Signs of malfunction:
  • 🟢 Spots of green plaque - oxidation of copper (the norm for older models).
  • 🟤 Dents or kinks - risk of freon leakage.
  • ❌ Oily smudges are a sign of microcracks.

Step 2. Checking the temperature of the tubes

• ✋ Carefully touch the tubes (with the compressor running):
  • 🔥 Hot (50–70°C) - the norm for the section from the compressor to the condenser.
  • ❄️ Cold (5–10°C) - the norm for the tubes after capacitor.
  • 🤒 Warm along the entire length —possible freon leak or blockage.

Step 3. Listening to noise

• 🎧 Attach ear to the body (or use a stethoscope). Alarming sounds:
  • 💨 Hissing - freon leaking through a crack.
  • 🔊 Rattling - tubes rub against the body (fixation is needed).

⚠️ Attention: If the tubes are covered with a layer of dust thicker than 5 mm, this impairs heat transfer by 30% and increases the load on the compressor. Clean the condenser with a soft brush or vacuum cleaner. at least once a year.

4. Table: diameters of copper tubes in refrigerators of different brands

The diameter of the tubes depends on compressor power i refrigerant type (R134a, R600a, R290). Below are the average values for popular brands:

The wall thickness of the tubes in modern refrigerators is 0.6–0.8 mm (previously they used 1–1.2 mm). This makes them more vulnerable to corrosion and mechanical damage.

5. Signs of damage to copper tubes: when to sound the alarm

Copper tubes rarely fail on their own - usually this is a consequence improper operation or external influences. Pay attention to the following symptoms:

1. Freon leak

• ❄️ Refrigerator doesn’t freeze, but the compressor works without stopping.
• 🌡️ The temperature in the chambers is above +10°C, despite the maximum settings.
• 🛢️ On the pipes or floor under the refrigerator oily stains (freon mixed with compressor oil).

2. Mechanical damage

• 🔨 Dents or kinks after transportation/impacts.
• 🧲 Sticking of magnets to tubes (a sign aluminum insertsthat are used in cheap models).

3. Corrosion and oxidation

• 🟢 Green coating on copper tubes (oxidation) is the norm for old refrigerators, but if it loose or with holesit is dangerous.
• 🟤 Black spots - a sign hydrogen sulfide corrosion (found in refrigerators stored in damp rooms).

⚠️ Attention: If a refrigerator Samsung or LG with an inverter compressor suddenly began to consume 20–30% more electricity, this may indicate microcracks in the tubesdue to which freon evaporates gradually.

6. Is it possible to repair copper tubes yourself?

Repairing refrigeration circuit tubes is a task for professionals. However some measures you can do it yourself:

What you can do yourself:

• 🧹 Cleaning condenser: remove dust from the back wall with a soft brush (do not use metal objects!).
• 🔧 Fixing the tubes: if the tubes rattle, secure them with plastic ties (do not overtighten!).
• 📏 Replacing the seal: if the tubes are damaged near the door, check the rubber seal - its wear can cause vibration.

What not to do:

• ❌ Solder the tubes without evacuating the system (the air inside will lead to oxidation).
• ❌ Use sealants to eliminate leaks (they clog capillary tubes).
• ❌ Bend the dents - the copper may burst.

If you suspect a freon leak, the only correct step - call a technician. Repair includes:

1. Detecting the location of the leak (using a leak detector or ultrasonic detector).
2. Evacuating the system.
3. Soldering or replacing a section of the tube.
4. Refilling the refrigerant (the cost depends on the type of freon: R600a is cheaper than R134a).

7. How to protect copper tubes from damage

Prevention will help avoid costly repairs. Follow these rules:

When transporting or rearranging:

• 🚛 Transport the refrigerator vertically (slope no more than 40°).
• 🛡️ Secure the compressor and tubes with shipping bolts (if provided by the design).
• 📦 Wrap the open areas of the tubes with foam rubber or bubble wrap.

During operation:

• 🧊 Do not place the refrigerator close to the radiator or stove (overheating of the tubes accelerates oxidation).
• 🔌 Use voltage stabilizer —current surges can cause water hammer in the system.
• 🧴 To clean the tubes, use only neutral detergents (for example, soap solution). Abrasives and acids destroy copper.

During storage (for example, at the dacha in winter):

• ❄️ If the refrigerator is not used, leave the door ajar for ventilation (this prevents corrosion).
• 🌡️ Store equipment in a dry room with a temperature above +5°C.

Frequently asked questions

❓ Why are the copper pipes in my refrigerator green? Is this dangerous?

Green plaque is copper oxidation (patina), which forms over time due to interaction with moisture and oxygen. For refrigerators older than 5 years, this is normal if:

• Raise even and dense (not loose).
• No visible cracks or oil smudges.
• Refrigerator works stably (freezes, does not overheat).

If plaque is accompanied deterioration of cooling, call a technician - perhaps corrosion is hidden under the oxide.

❓ Is it possible to replace copper tubes with aluminum ones?

Technically possible, but not recommended. Aluminum is cheaper, but:

• Its thermal conductivity is lower (200 W/mK versus 398 for copper) → worse cooling.
• Aluminum is more difficult to solder (requires special fluxes and solders).
• It oxidizes faster and bends worse (risk of cracks due to vibration).

In cheap refrigerators they sometimes use combined tubes (copper + aluminum), but this reduces the reliability of the system.

❓ How can you tell that a tube has burst if the freon is colorless?

Freon is really colorless and odorless, but there are indirect signs of a leak:

• 🛢️ Oil stains on the tubes or the floor (freon comes out along with the compressor oil).
• ❄️ Refrigerator stops freezing, but the compressor works without stopping.
• 🔊 When there is a leak, you can sometimes hear it light hissing (especially in silence).
• 🌡️ Tubes do not heat up (if the high pressure line has burst).

For accurate diagnostics, the master uses electronic leak detector or an ultrasonic detector.

❓ Why are the tubes in new refrigerators thinner than in old ones?

Modern refrigerators are optimized by:

• 💰 Costs: copper is expensive, so manufacturers reduce its consumption.
• ⚡ Energy efficiency: thin tubes + inverter compressors reduce electricity consumption by 20–30%.
• 🌍 Environmentally friendly: new refrigerants (R600a, R290) require a smaller volume of pipes.

However, this makes the system more vulnerable prone to corrosion and mechanical damage. For example, in refrigerators Atlant 1990s, the tubes had a wall thickness of 1.2 mm, and in modern models - only 0.6–0.8 mm.

❓ What to do if the tube is bent when moving?

Actions depend on the degree of damage:

• 🟢 A slight bend without cracks: carefully straighten the tube hands (not with pliers!). Check the tightness with a soap solution (if bubbles appear, there is a leak).
• 🟡 Severe dent: do not try to straighten it - the copper may burst. Call a technician for diagnostics.
• 🔴 Crack or puncture: immediately turn off the refrigerator and do not turn on before repair (freon is toxic in high concentrations).

If the refrigerator operates normally after a bent tube, but you hear rattling, secure the tube with a plastic clamp to the body.