How to make a freezer out of a refrigerator: is it realistic and how to do it correctly

The idea of turning an old refrigerator into a full-fledged freezer arises for many: when the freezer compartment is sorely lacking, and there is no way to buy new equipment. At first glance, the task seems simple - just set the thermostat to maximum and wait. But in practice, everything is much more complicated: ordinary refrigerators are not designed for constant operation in deep freezing mode, and such experiments are fraught with breakdowns, fires or spoilage of food.

In this article we will figure out whether it is technically possible to convert a refrigerator into a freezer, which models are suitable for this (and why most don't), and look at safe alternatives, from tweaking your existing equipment to budget-friendly ways to increase your freezer space. You will learn which cooling system parts will have to be modified, why the compressor may burn out after a month of intensive work, and how to avoid typical mistakes during such modifications.

Spoiler: in 90% of cases, rework is impractical, but if you are willing to take the risk, we will provide a checklist of actions taking into account technical limitations. And for those who are looking for a practical solution, we will offer proven ways to optimize the available space without radical interventions in the design.

Why a refrigerator can’t just become a freezer

The main misconception is that it is enough to turn the thermostat to minimum (usually -18°C or -24°C), and the refrigerator will start working like a freezer. In fact the cooling and freezing modes are fundamentally different:

• 🔹 Temperature range: refrigerators maintain +2°…+8°C in the main chamber, and freezers - -18°…-24°C. Even if you set the minimum temperature, the compressor is not designed for constant operation in extreme mode.
• 🔹 On/off cycles: in the refrigerator the compressor works intermittently (for example, it works for 15 minutes, rests for 30 minutes). Freezers have shorter cycles or operate almost continuously.
• 🔹 Type of refrigerant and oil in the compressor: freezers use special oils and freons (for example, R600a or R134a), which do not lose their properties at ultra-low temperatures. Refrigerators have different compositions.
• 🔹 Thermal insulation: the walls of freezers are thicker (usually 60–100 mm polyurethane foam versus 40–50 mm refrigerators), and the door seals are more airtight.

If you ignore these differences, the consequences can be serious:

⚠️ Attention: Forced operation of the refrigerator in freezer mode leads to overheating of the compressor due to the lack of pauses in the cycle. In the best case, the starting relay will burn out, in the worst case, the motor winding. The risk of fire increases by 3–5 times.

Another problem is icing of the evaporator. Freezers have defrosting systems (No Frost or drip defrosting), and in refrigerators, ice will build up in a layer, blocking the air channels. This will lead to: -18°C the ice will build up in layers 2–3 cm per month, blocking the air channels. This will lead to:

• 🧊 Increased load on the compressor (increased energy consumption by 30–50%).
• 🔌 Frequent activation of thermal protection (the refrigerator will turn off spontaneously).
• ❄️ Food spoilage due to uneven distribution of cold.

Which refrigerators can theoretically be converted

Of hundreds of models on the market only 5–7% can be converted with minimal risks. These are refrigerators with the following characteristics:

Even if your model falls to this list, you will need:

1. Replace thermostat with a model with a range up to -24°C (for example, Danfoss 077B6344).
2. Install additional fan for circulation air (a computer cooler with 12 V will do) compressor).
3. Check compressor oil level - At low temperatures it thickens.

⚠️ Attention: Refrigerators with one compressor and drip defrosting system (for example, Birusa 130 or Snaige FR-145) their evaporator is absolutely not designed to work at -18°C and will be covered with ice 2-3 weeks.

Why No Frost is better for alterations?

In No Frost systems, the evaporator is hidden behind the back panel, and the fan evenly distributes the cold. This reduces the risk of icing and overheating of the compressor. In drip systems, the evaporator is open, and at -18°C, ice blocks heat exchange.

Step-by-step instructions: how to modify a refrigerator

If you are confident in your model and are ready to take risks, follow this algorithm. Perform all work with the power turned off!

1. Dismantling the internal shelves and doors

Remove all plastic shelves, drawers and grilles - they are not designed. on -24°C and may burst. It is better to replace the door with a solid one (for example, from an old freezer) or insulate the existing one with expanded polystyrene thickness 20–30 mm.

2. Replacing the thermostat

A standard refrigerator thermostat (for example, K-59 or Orion T-130) is not suitable - it cannot maintain the temperature lower. Buy a specialized thermostat for freezers. (for example -12°C. Buy a specialized thermostat for freezers (for example, Ranco K-52 or Johnson Controls A419). Connection:

1. Disconnect the old thermostat (remember the wiring diagram!).
2. Connect the new one according to the diagram:
- Terminal 1 → Compressor
- Terminal 2 → Power wire (220 V)
- Terminal 3 → Temperature sensor (install it in the center of the chamber)

3. Modification of the compressor

If the compressor is weak (power up to 100 W), it will have to be replaced. Suitable models:

• 🔧 Embraco EGX 120HL (120 W, for cameras up to 200 l).
• 🔧 Secop (Danfoss) NL11NX (150 W, universal).

When replacing, use the same oilas in the old compressor (you cannot mix different types!) Volume of oil for refilling:

4. Insulation and sealing

Check the door seal - if it hardens in the cold, replace it with silicone (for example Magneo 12×24 mm). Additionally, glue the joints aluminum tape.

Is the power turned off?|Has the door been checked for tightness?|Has a new thermostat been installed?|Is the compressor filled with oil?|Have all plastic parts been removed? details?-->

5. First launch and testing

Turn on the refrigerator in freezer mode and observe:

• ⏱️ At first 2-3 hours the compressor should work continuously (this is normal).
• ❄️ After 6 hours the temperature inside should drop to -10°C.
• 🔥 If the compressor turns off ahead of time, check start relay (perhaps it cannot withstand the load).

Risks and hidden problems of reworking

Even if you managed to start the refrigerator in freezer mode, after 1-3 months critical faults may appear:

1. Compressor overheating: Without modifying the cooling system, the engine will overheat. Signs:
   • 🔥 The compressor housing is hot (above +70°C).
   • 🕒 Operating cycles are extended to 1–2 hours without shutdown.

Freon leakage: At low temperatures, rubber hoses and soldering may crack. Particularly dangerous for refrigerators older than 10 years - they used R12 freon, which when leaked produces toxic fumes.

Icing of the drainage system: Water from the defrost will freeze in the drainage hole, causing leaks.

According to statistics from service centers, 80% homemade freezers from refrigerators fail in the first year. Main. reasons:

• 🛠️ Poor soldering of tubes (leads to refrigerant leakage).
• ⚡ Inconsistency of compressor power (winding burns out).
• 🧊 Lack of a defrosting system (ice blocks ventilation).

⚠️ Attention: If your refrigerator uses refrigerant R600a (isobutane), its leak creates a risk of explosion when concentrated in the air from 1,3%Before remodeling, check the type of freon (indicated on). compressor nameplate).

Alternative solutions: how to increase freezer space without remodeling

If the goal is simply to get more freezing space, consider these options (they are safer and cheaper than remodeling):

1. Optimizing your existing freezer

Check how efficiently you are using the available space:

• 📦 Use vacuum bags —they reduce the volume of products by 30–40%.
• 🧊 Defrost the chamber every 1-2 months (ice thickness 5 mm increases energy consumption by 20%).
• 🔄 Rearrange the shelves: the bottom is colder (suitable for long-term storage), the top is for frequently used products.

2. Purchasing a used freezer. cameras

On the secondary market you can find working freezers for 3 000–8 000 ₽. Optimal models:

• 💰 Atlant M 7184-100 (7 cubic feet, -24°C, 5 000 ₽).
• 💰 Sarov Frost MK-140 (140 l, -18°C, 6 500 ₽).

Before purchasing, check:

1. The condition of the seal (there should be no cracks).
2. Noise level (norm - up to 40 dB).
3. Availability No Frost systems (otherwise you will have to defrost once a month).

3. Freezer rental

Some services (for example, "Morozko" or "Cold service") rent freezers for 800–1,500 ₽/month. This is more profitable than repairing a burnt-out refrigerator.

4. Use of dry ice makers

Suitable for short-term storage (for example, at the dacha) thermoelectric freezers (for example, Midea WHS-108FW1). They consume little energy (80–100 W), but maintain temperatures only up to -12°C.

Remake old refrigerator|Buy a used freezer|Rent a chamber|Optimize your current freezer-->

How much does it cost to remodel vs buying a new one

Let's compare the costs of remodeling and alternative solutions:

As can be seen from the table, remodeling a refrigerator is the most risky and short-lived option. Even if you manage to save money at the start, after six months you will have to spend money on repairs or buying new equipment. 2 000–3 000 ₽ at the start, after six months you will have to spend money on repairs or purchase of new equipment.

Another nuance - a homemade freezer will consume money. energy consumption. A homemade freezer will spend on 30–50% more electricity than the factory one. For example:

• 💡 Converted Atlant XM-4021 — 1.5–2 kW/day.
• 💡 Factory Samsung RT-22 HAR4DSA1 — 0.9–1.1 kW/day.

Over the year, the difference will be 2 000–3 000 ₽ on electricity bills.

Common mistakes and how to make them avoid

If you still decide to remake, study this list of typical mistakes:

1. Ignoring climate class:

   Refrigerators of class N (for example, Indesit BIAA 13) are not designed to operate at temperatures in room below +16°C. If you place the freezer in the garage or on the balcony in winter, the compressor will not turn on.

2. Lack of ventilation:

   A closed box or niche for the refrigerator impairs heat transfer. There should be no gap with the walls less 5 cm rear and 2 cm sides.

3. Use of incompatible refrigerant:

   If you are charging the system freon R134a instead R600a, the compressor will work for wear. Check compatibility according to the table:

   Compressor type	Suitable freon
   Embraco EG	R600a, R134a
   Secop (Danfoss) NL	R600a, R290
   Mitsubishi SR	R134a, R404A

4. Neglect defrosting:

   Even in No Frost systems, ice builds up over time. Defrost the chamber every 2 months, otherwise energy consumption will increase by 40%.

⚠️ Attention: If your refrigerator is released up to 2010, it can use refrigerant R12 or R22, which are prohibited for refilling in the Russian Federation with 2020Before modification, check the type of freon at the service center.

FAQ: Answers to frequently asked questions

Is it possible to remake a refrigerator with one compressor?

Technically it is possible, but highly not recommended. Single-compressor models (for example, Birusa 101 or Snaige FR-106) do not have a separate circuit for the freezer. Forced mode -18°C will lead to:

• Motor overheating (will burn out in 1–3 months).
• Icing of the evaporator (will have to be defrosted every week).
• Increased energy consumption (up to 2.5 kW/day).

Exception - models with electronically controlled and function Super Freeze (for example, Liebherr CPesf 4023). They can be temporarily installed -24°C, but not permanently.

How much electricity will the converted refrigerator consume?

Depends on the model and volume of the chamber. Approximate calculations:

• 💡 Refrigerator Atlant XM-4021 (180 l) in freezer mode: 1.8–2.2 kW/day (54–66 kW/month).
• 💡 Factory freezer Samsung RT-22 (200 l): 1–1.2 kW/day (30–36 kW/month).

The difference in consumption is 20–25 kW/monthwhich at the tariff 5 ₽/kW will cost 100–125 ₽ additional costs monthly.

Is it possible to use a converted refrigerator for storing meat?

No, if we are talking about long-term storage (more 1 month). Reasons:

1. Unstable temperature: in homemade freezers, changes from -12°C to -24°Care possible, which leads to partial defrosting and spoilage of meat.
2. No dry freezing system: used in factory freezers shock freezing (rapid cooling to -30°C), which preserves the structure of products. In the converted refrigerator, the meat will crystallizelosing its taste.
3. Risk of bacteria: with uneven cooling on the surface of the meat can develop Listeria or Salmonella.

For short-term storage (up to 2 weeks) it is suitable, but no more.

How to check whether my refrigerator can withstand the alteration?

Before starting work, perform 3 tests:

1. Compressor test:

   Turn on the refrigerator to maximum (-16°C) and note the operating time of the compressor. If it turns off earlier than after 20 minutes the motor is weak for the freezer.

2. Sealant test:

   Close the door with a piece of paper. If it falls out or is easily pulled out, the seal needs to be changed.

3. Icing test:

   Put the refrigerator on -12°C and leave on 24 hours. If ice appears on the back wall with a thickness of more than 3 mm the defrosting system will not cope with the freezing mode.

If at least one test fails, rework is not advisable.

What to do if after the modification the refrigerator does not freeze?

Possible causes and solutions:

Problem	Cause	Solution
Compressor works, but does not freeze	Freon leak or clogged capillary tube	Refilling is needed (contact service)
The compressor does not turn on	The starting relay is burnt out or thermostat	Replace the relay (RBM-1 or DANFOSS 103N0010)
The temperature is fluctuating	The temperature sensor is faulty	Check the contacts or replace the sensor
A hum is heard, but there is no cooling	The compressor is jammed	The compressor needs to be replaced

If you do not understand refrigeration equipment, it is better to call a specialist. The average cost of diagnostics is 1 000–1 500 ₽.