After a successful replacement compressor in the refrigerator, many owners are faced with a frightening situation: the unit hums without interruption, not turning off for hours. This causes natural anxiety, because the budget for repairs has just been spent, and it seems that the problem has not been solved. However, in most cases, long-term operation of the motor immediately after installing a new unit is an absolutely normal process, determined by the physics of cooling and the peculiarities of filling the system.
The time of initial entry into mode depends on many factors, including chamber volume, ambient temperature and filling accuracy. refrigerant. Understanding these processes will help you distinguish normal operation of equipment from a sign of malfunction and avoid panic. In this article we will analyze in detail the time frame, the reasons for the long operation and the criteria by which we can judge the quality of the repair performed.
Physics of the process: why the motor does not stop
The main reason why the new compressor works for a long time lies in the need to completely cool the entire volume of the refrigeration chamber and freezer from scratch. After replacing the motor, the system is empty, and the refrigerant must circulate, displacing heat from the walls and products. Heat capacity metal and plastic are large, so a significant number of cooling cycles are required to reduce the temperature from room to operating temperature.
In addition, inert gas or vapor may remain in the system moisture that interferes with effective heat transfer. The new compressor must “push” the refrigerant through the entire system, including capillary tube and the condenser, to create a stable pressure. If there are products in the chamber, the process is delayed, since they give off accumulated heat to the air, which, in turn, is cooled by the evaporator.
⚠️ Attention: If after replacing the compressor you hear unnatural knocking or metallic clanging, and not a smooth hum, turn off the device immediately. This may indicate improper fastening of the motor or a defect in the new unit itself.
Standard operating time: when to wait for a shutdown
There is no specific time that should pass before the first shutdown as one digit for all models. However, experienced craftsmen focus on certain time ranges. For a standard two-compartment refrigerator, the initial cooling time is usually between 4 and 8 hours. During this period, the unit can operate without pauses.
If we are talking about models with the system No Frost, the time can increase to 10-12 hours. This is due to a more complex air duct system and the need to cool not only the food, but also the evaporator itself, hidden behind the panel. In some cases, especially in summer or when fully loaded with warm food, the refrigerator may not turn off for up to 24 hours.
Below is a table showing the approximate operating time depending on the type of equipment and conditions:
| Refrigerator type | Loading conditions | Expected time until 1st shutdown | Maximum permissible time |
|---|---|---|---|
| Single chamber | Empty | 2-4 hours | 6 hours |
| Double chamber (Drop) | 50% loaded | 4-6 hours | 10 hours |
| No Frost | Full load | 8-12 hours | 24 hours |
| Freezer compartment | Empty | 3-5 hours | 8 hours |
It is important to consider that these data are relevant with working sensors. If, after the maximum time has elapsed, the motor continues to operate and the temperature inside does not drop, diagnostics are required. thermostats and sensors. If, after the maximum time has elapsed, the motor continues to run and the internal temperature does not drop, diagnostics are required.
Factors influencing the duration of the first cycle
Many variables influence how long the refrigerator will operate after replacing the compressor. The first step is to assess the temperature in the room. If the renovation was carried out in the summer and the room is hot, the efficiency of heat removal through condenser reduces. The motor has to work harder to compensate for the heat inflow.
The second important factor is the quantity and temperature of the products. An empty refrigerator will cool down faster. If you load warm food into the chambers immediately after switching on, the compressor will work harder, trying to cool a large amount of heat. The tightness of the door seals is also important.
Key factors that extend operating time:
- 🌡️ High room temperature (above +25°C).
- 🍖 Loading warm or room temperature products.
- 🚪 Frequent opening of doors during the primary cooling process.
- ❄️ The presence of a No Frost system, which requires more time to stabilize.
The influence of air humidity
High humidity in the room can lead to the formation of condensation on the external walls and the evaporator, which temporarily worsens heat transfer and makes the compressor work longer than usual.
Technical nuances: filling and vacuuming
The quality of the work performed directly affects the behavior of the refrigerator. A critical step is to evacuate the system before refueling freon. If the technician cannot withstand the operating time of the vacuum pump (usually 10-15 minutes), air and moisture remain in the system. The air creates an “air lock”, increasing the pressure in the system and forcing the compressor to work with overload.
The accuracy of the refrigerant dosage is also important. A lack of freon will cause the motor to run constantly, but will not be able to reach the desired temperature. Excess freon is also dangerous: liquid can enter the compressor, causing water hammer, or increase condensation pressure, which will lead to overheating and long operation.
⚠️ Attention: If, when touching the condenser (grid at the back), you feel that it is only half hot or has a sharp temperature difference, this may indicate a clogged capillary system or an incorrect refueling.
The refueling process must be controlled by current consumption and pressure in the system. The use of scales when refueling isobutane or R600a is mandatory, since a deviation of even 5-10 grams can disrupt the operation of the entire unit.
☑️ Quality control of repairs
Symptoms of malfunction: when it’s time to sound the alarm
Despite the fact that long-term operation is often the norm, there are signs that cannot be ignored. If the refrigerator hums for more than 24 hours, but the temperature inside remains high (above +10°C in the refrigerator compartment), this indicates a problem. It is also worth paying attention to the temperature of the compressor housing.
If the motor is hot to such an extent that it is impossible to touch it, or, conversely, remains cold during prolonged operation, these are signs of a malfunction. In the first case, overheating of the windings or problems with heat dissipation is possible, in the second - a freon leak or breakdown of the compressor itself.
Alarm signals:
- 🔥 The compressor is very hot, smells of burnt plastic or oil.
- 🧊 Inside the refrigerator warm, there is no frost or condensation on the walls.
- 🔊 Extraneous sounds have appeared: gurgling, clicking, whistling.
- 💡 The emergency temperature indicator is on (if any).
In such cases, you must contact the technician who carried out the repair. Independent attempts to “fix” a newly repaired device can lead to the final failure of the equipment.
Recommendations for operation after repair
To ensure that the new compressor lasts a long time and comes into operation as quickly as possible, follow simple rules. Do not load the refrigerator with food at once. Let it run empty for at least 2-3 hours. This will allow the system to stabilize pressure and temperature without unnecessary stress.
Ensure good ventilation. Move the refrigerator at least 5-7 cm away from the wall. If heat is not removed from the condenser, operating efficiency will drop and the motor will run longer. Regularly check the cleanliness of the rear radiator grille.
Monitor the position of the door. Make sure it fits snugly against the body. If the seal is damaged or the door is warped, warm air will constantly flow in, causing the compressor to work non-stop. In the first day after repair, try not to open the doors unless absolutely necessary.
Why can’t you turn it on right away?
If the refrigerator was transported lying down, the oil needs time (up to 4-8 hours) to drain back into the compressor. Switching on ahead of time can lead to water hammer and damage to the new unit.
Frequently asked questions (FAQ)
Is it normal that the refrigerator is humming for 10 hours after replacing the compressor?
Yes, this is quite normal, especially for two-chamber models or appliances with the No Frost system. It may take up to 24 hours for the volume to cool completely and the temperature to stabilize. The main thing is that it gradually becomes colder inside.
How long should the thermostat work after replacing the motor?
The thermostat will turn off only when the sensor records the set temperature. Until the entire volume of the chamber has cooled down, the thermostat will not open the circuit. This can take from 4 to 12 hours depending on the model.
What to do if the refrigerator works for a day and does not freeze?
If more than 24 hours have passed and there is no cold, most likely there is a freon leak, a clogged capillary system, or a filling error. It is necessary to call a technician for re-diagnosis.
Can a new compressor be defective?
Yes, the likelihood of a factory defect exists, although it is low. If the new motor heats up excessively or makes strange sounds immediately after installation, this may indicate a defect.