The need to turn off the freezer compartment in an old refrigerator often arises in everyday life: someone wants to save energy, someone’s evaporator has failed, and someone simply needs to increase the volume of the refrigerator compartment for storing vegetables and drinks. Unlike modern models with a No Frost system and complex electronics, old units they have a simpler design, which theoretically simplifies the task, but requires caution when interfering with the electrical circuit or refrigerant system.
It is important to immediately understand that completely “cutting out” the freezer from the cooling system without loss The functionality of the main compartment is impossible in most single-compressor models, since refrigeration generation is often tied to a common circuit. However, there are proven ways to minimize the operation of the freezer or convert it to store food at above-zero temperatures. In this article, we will analyze in detail the technical nuances, risks and step-by-step algorithms of action.
Before taking up the tools, you need to determine the type of your device. Refrigerators Soviet-made, such as "Saratov", "Biryusa" or "ZIL", as well as early models of foreign brands, often have a drip defrosting system and mechanical control. It is for them that the methods described below are relevant, since there is practically no electronics here, and all processes are regulated by the physics of the compressor and thermostat.
Analysis of the design and type of refrigerator
The first step should always be diagnostics of the device. The strategy of action depends on how many compressors there are in your refrigerator. In older models, the most common circuit is one with with one compressor, which drives freon along both circuits. In such cases, the freezer is the primary consumer of cold, and it is from it that the cold is transferred to the refrigeration compartment.
If you have a two-compressor unit, which is rare for older models, the problem can be solved in an elementary way: just turn off the power to the second compressor or remove the thermostat from it. However, statistics show that most users are faced with single-circuit systems, where physical separation of the circuits is impossible without professional resoldering and refilling.
Particular attention should be paid to the condition of the seals and thermal insulation. In old refrigerators rubbers often dry out, which leads to a constant flow of warm air. This causes the compressor to work hard, trying to maintain the temperature in the freezer, even if you turn it off programmatically. Checking the tightness is a mandatory step before any manipulations.
- 🔍 Determine the number of compressors by looking at the back wall of the unit.
- ❄️ Find the location of the evaporator - in older models it is often hidden behind the back wall inside chambers.
- 🔌 Check the availability of separate thermostats for each chamber.
- 📜 Study the technical data sheet, if available, to understand the refrigerant circulation diagram.
⚠️ Attention: Interfering with the refrigerant (freon) circulation system without a license and special equipment is prohibited by law in many countries and can lead to depressurization of the circuit.
Shutdown methods in two-compressor models
If your old refrigerator is equipped with two motors, you are very lucky. This allows the temperature in each chamber to be controlled independently. To turn off the freezer compartment, just find the electrical circuit that powers the second compressor and break it. This can be done by turning off the thermostat, which is responsible specifically for the freezer.
The process begins with dismantling the thermostat casing. It is usually located inside the refrigerator compartment or outside, next to the temperature control knob. You will need to locate the leads going to the freezer compressor and either remove the heat sensing tube or physically disconnect the wires leading to the motor. After this, the motor will no longer receive a signal to start.
In some models Indesit or Ariston of the previous generation, you can simply move the thermostat knob to the "0" or "Off" position. If the regulator is mechanical and does not have a clear off position, it may need to be replaced with a jumper or completely removed from the circuit. The main thing is not to confuse the wires leading to the main compressor.
After turning off the second motor, the temperature in the freezer will begin to rise. After 6-10 hours it will become equal to the temperature in the refrigerator compartment. This is an ideal option for those who want to use the entire volume for vegetables, wine or canned goods without fear of them freezing.
Features of single-circuit systems
The situation changes dramatically when it comes to a classic Soviet or early imported refrigerator with a single compressor. Here refrigerant circulation it is arranged sequentially: first, freon passes through the evaporator of the freezer, cooling it to sub-zero temperatures, and only then, having given up some of the cold, it enters the circuit of the refrigeration compartment.
An attempt to simply “dampen” the freezer in such a system doomed to fail. If you block the cold supply to the freezer or try to insulate it, the main circuit will also stop receiving cold. The compressor will drive freon, but the evaporator in the refrigeration compartment will remain warm, since heat exchange is disrupted.
The only physical way to change the situation in a single-circuit is to intervene in the design of the evaporator, which requires calling a refrigeration technician. A specialist can install an additional circuit or rework the system, making the freezer independent, but the cost of such work often exceeds the price of a used refrigerator. Therefore, for single-circuit models, only software or semi-software methods of limiting operation are considered.
Why can’t you just shut off the capillary tube?
Blocking the capillary tube in an arbitrary place will lead to an increase in the pressure in the system to critical values, which is guaranteed to cause the compressor to fail or cause a pipeline rupture.
Owners of such units should think about the feasibility of remodeling. It is often easier to accept the presence of a freezer, using it to store ice or semi-finished products, than to risk the integrity of the entire system. However, if the goal is to save energy, there are ways to limit the operating time of the compressor.
Software limitation of operation through a thermostat
The most accessible way to “turn off” the freezer in an old refrigerator is to adjust the operation of the thermostat. The essence of the method is to force the compressor to turn off before the freezer has time to reach a low temperature. As a result, the temperature in the freezer compartment will be around 0..-5°C, which turns it into a compartment for storing vegetables or very short-term freezing.
To implement this method, you need to find a thermostat. In older models, it often looks like a knob with numbers from 1 to 7 or from “Min” to “Max”. By setting the regulator to the minimum cold position (usually number 1), you reduce the operating time of the compressor. However, in old thermostats the adjustment range can be wide, and even at “one” the freezer will freeze.
Here the mechanical adjustment of the thermostat itself comes to the rescue. Inside the thermostat housing (for example, TAM-133 or K-59) there is a screw under the seal or a hidden adjustment screw. Turning this screw changes the shutdown temperature range. By turning the screw clockwise (usually), you increase the shutdown temperature. Thus, the compressor will turn off when the chamber becomes, for example, -2°C instead of -18°C.
- 🔧 Remove the regulator knob and the decorative trim to get to the thermostat housing.
- 🔍 Find the adjusting screw (often it is filled with compound or hidden under a seal).
- 🔄 Turn the screw no more than 1/8 of a turn at a time.
- 🌡️ Monitor the temperature using an external thermometer for 24 hours.
After each tightening of the screw, you must wait a day for the refrigerator to enter a new operating mode. If you twist the screw too much, the compressor may stop turning on altogether, and the food in the refrigerator compartment will begin to spoil.
⚠️ Attention: When adjusting the thermostat, monitor the temperature in the refrigerator compartment. If it rises above +8°C, storing perishable foods will become hazardous to health.
Use of external timers and relays
A more radical, but effective method of monitoring the operation of an old refrigerator is to install an external timer or time relay. This method does not require opening the electrical circuit of the unit itself, which preserves the warranty (if it is still valid) and the integrity of the seals. You simply interfere with the power supply to the entire refrigerator.
The essence of the method is simple: you set work and rest cycles. For example, a refrigerator runs for 30 minutes, then rests for 30 minutes. During operation, the compressor cools the chambers, and during idle time the temperature is equalized. By choosing the right cycle, you can ensure that the temperature in the freezer does not drop below -5..-7°C. This turns it into a “zero zone” or a zone of deep cooling, but not deep freezing.
To implement this, you will need a mechanical or electronic timer with a socket. Mechanical timers are more reliable and easier to set up for such tasks. You align the disk around the perimeter: leave the segments corresponding to work time on, and leave the rest segments off. It is important to consider that old compressors do not like frequent switching on, so the minimum rest cycle should not be less than 15-20 minutes, and the work cycle should not be less than 20 minutes.
This method also significantly saves energy, as it reduces the total operating time of the motor. However, it requires an experimental selection of modes depending on the ambient temperature (room temperature) and the load of the refrigerator with food.
Safety precautions and food preservation
Any manipulations with electrical appliances require strict adherence to safety rules. Old refrigerators often have worn-out wire insulation, and grounding may be missing or ineffective. Before starting work on removing panels or adjusting thermostats, be sure to unplug the device.
It is also worth remembering the risks associated with storing food. If you unplug your freezer, it is no longer a safe place to store meat, fish or ice cream. Bacteria begin to multiply at temperatures above -6°C, so the contents must either be consumed as soon as possible or transferred to a working freezer.
When working with thermostats and electrical circuits, use tools with dielectric handles. Do not touch live parts. If you smell burning, see sparking or hear an uncharacteristic hum, stop work immediately and turn off the refrigerator.
| Parameter | Normal value | When turning off the freezer | Risk |
|---|---|---|---|
| Temperature in the freezer | -18°C.. -24°C | 0°C.. -5°C | Spoiling of frozen food |
| Temperature in the refrigerator compartment | +2°C.. +5°C | +2°C.. +8°C | Accelerated souring of milk |
| Compressor operating time | 30-40% of the cycle | 15-25% of the cycle | Insufficient cooling |
| Energy consumption | Standard | Reduced by 30-50% | No |
☑️ Checklist before modification
Frequently asked questions (FAQ)
Is it possible to completely remove the freezer physically, leaving only the refrigerator?
Theoretically it is possible, but this requires a complete overhaul of the system: removing the freezer evaporator, recalculating the length of the capillary tube and refilling with freon. This is not economically feasible for an old refrigerator; it’s easier to buy a new single-chamber unit.
Why did the refrigerator become too warm after turning off the thermostat?
Most likely, you overdid it with adjusting the thermostat screw or incorrectly determined the type of thermostat. Some thermostats open the contacts completely when turned in one direction. Return the settings back and check the temperature with an external thermometer.
Is it safe to use a timer to control an old refrigerator?
Yes, it is safe if the power of the timer matches the power of the compressor (usually 200-400 W). However, frequent on/off cycles (less than 10 minutes of operation) can shorten the life of the compressor.
What to do if, after adjustment, the compressor does not turn on at all?
This means that the temperature in the chamber is above the thermostat response threshold. Either you have tightened the adjusting screw too much, or the thermostat itself has failed. Try short-circuiting the thermostat contacts (with the power off!) to check the operation of the motor.
In conclusion, it is worth noting that turning off the freezer is a temporary solution or compromise. Old refrigerators were created as a single system, and imbalance of its operation always carries risks. If your goal is to permanently store food without freezing, consider purchasing a specialized refrigerated display case or cabinet that is designed to operate in the positive temperature range.