The refrigerator thermostat is a device whose purpose is to adjust the air temperature in the refrigerator compartment . It determines how many degrees it will be.
Thermostat device for a refrigerator
The temperature regulator consists of the following constituent parts:
- the housing inside which the changeover contacts are located;
- bellows with diaphragm;
- The bellows tube, which is directly a temperature sensor.
How does the refrigerator thermostat work?
The principle of the thermostat for a refrigerator is as follows. A reagent was pumped into the bellows tube. It is identical to the one in the refrigerator system. The physical properties of the reagent differ in that its pressure is directly dependent on the temperature of the medium in which it is located. If it changes, then the reagent is compressed or expanded. At the same time, it acts on the sensitive membrane, which is mechanically connected to the switching electrical contacts of the refrigerator relay. The tube is pressed against the evaporator plate and controls the temperature of the refrigerator.
Refrigerator thermoregulator - types and characteristics
Classification of thermoregulators for a refrigerator implies their division into two main types:
- Electronic thermostat for a refrigerator. This is the most common model. Its device assumes the presence of a semiconductor temperature sensor and a control unit. The purpose of the latter is to process the signal from the temperature sensor and turn the refrigerator on and off. The electronic thermoregulator is characterized by a rather complicated circuit, which is reflected in its repair. However, an undoubted advantage is the high accuracy of tracking and changing the operating modes of the refrigerator.
- Mechanical thermostat for a refrigerator. It is also, like the electronic, highly reliable. To its pluses is that it is easy to replace in the event of a breakdown. As a rule, it works on the temperature of the evaporator, while the electronic temperature regulator - through the air.
How to check the refrigerator thermostat?
Sometimes there are situations that may indicate a malfunction of the refrigerator thermostat. For example, an alarming signal is that products began to deteriorate.
It happens that the thermostat is set to too high a temperature. This can cause the refrigerator to freeze. Such a situation could arise if the thermostat accidentally hooked, and it was not in its place. If it was returned to its original position, and no changes occurred, then a thermostat check will be required. This will require access to the back of the refrigerator.
The algorithm of actions is as follows:
- Find the thermoregulator and remove all unnecessary that prevents it from reaching it.
- Read the layout of the contacts and find them.
- Disconnect the internal cable through which the signal is coming from the thermostat.
- Call the power cable. If everything is all right with him, then there will be a signal. In the event of a cable failure on one of the sections, it will not ring.
- Call the plug terminals. In this way, a short circuit can be detected.
Having carried out certain actions, you can independently identify the cause of the failure, which will facilitate the process of repairing the thermostat.