Adjust and check the refrigerator thermostat
It’s hard to imagine your life without home appliances. There are appliances without which we could do without, and there are those without which the arrangement of living space is quite reasonably considered incomplete. One of these vital items is a refrigerator. Agrees?
how to best setting thermostat setting best cooling refrigerator and fridge freezer and Urdu Hindi
The repair of home appliances made by our hands is a good help to the family budget. If you want, you can master many repair operations. For example, to replace the thermostat for the refrigerator is not so difficult. It is only necessary to understand the peculiarities of the design and the principles of operation of the device.
We will tell you how to find the faulty thermostat. In this article we describe in detail how to replace it during the repair of refrigerator Stinol. The information is accompanied by a thematic selection of photos and videos with tips from experts.
How the mechanism works
The principle of operation of the thermostat is simple. One side of the tube is located within the cooling zone and attached to the evaporator. Cooling, the lever of a working thermostat opens contacts. When the temperature inside the chamber rises, the thermostat used for the refrigerator closes the electrical circuit. A small spring, to which the temperature adjustment knob is attached, is responsible for moving the contacts. Change the position of the lever adjusts the tension of the spring. It affects the amount of pressure in the freon tube and the reaction of electrical contacts.
The electronic thermostat for a refrigerator works differently, although the principle of operation is the same. The required temperature values are reached by heating or cooling the capillary tube. Modern refrigerators are equipped with electric modules, which send commands to a group of sensors at a time. A diagram of the appliance is shown in the picture below.
How to check the thermostat yourself
A broken part does not immediately stop the appliance from working, but it will not function properly.
Signs of thermostat malfunction:
- the unit does not turn on after being switched off;
- the temperature in the chamber is 0°C or lower;
- The rear wall is covered with snow and ice;
- The compressor works without interruption or with short interruptions;
- inside the refrigerating chamber heat.
These signs indicate more than just a broken thermostat. They are characteristic when other parts are malfunctioning.
Refrigerator runs continuously
When the unit is working without switching off, you can check the working order of the refrigerator thermostat with a thermometer. To do this, unplug the appliance, remove all food and defrost.
Tip. Do not break off or chisel ice during defrosting. This will cause more serious damage to the unit.
Then turn on the appliance. Adjust knob to the lowest possible temperature. If the device has a freezing mode, turn it on. On the middle shelf of the chamber place a thermometer that measures the temperature of the air in the house. Leave the refrigerator for 2 hours, then check the readings. If they are within 6 ° C, then the thermostat is good. When it is colder or warmer in the chamber, the part must be replaced.
Formation of ice on the walls of the unit
If ice forms quickly in the refrigerator after defrosting, then the thermostat is diagnosed as follows. While the compressor is running, the adjustment knob is turned to increase the temperature inside the unit. If the relay is functioning, the sensor will fix the necessary temperature level, and as a result the compressor will switch off. If the motor continues to run, the thermostat needs to be replaced.
After the diagnosis (if the relay is functional), remove all the food from the chambers. Let the machine run idle for about 6 hours. Pay attention to duration of compressor downtime. If the idle time is about 40 minutes, the refrigerator is used in a usual mode. Frequent switching off and on is regulated by adjusting the relay settings. If this does not work, the thermostat is replaced with a new one.
The refrigerator does not turn on
If the device does not turn on after switching off, to check the refrigerator’s thermostat for proper operation, it is dismantled. To do this, the appliance is disconnected from the mains. Then remove the handle, unscrew the screws and remove the protective housing. Then carefully inspect the part, paying attention to the wires. Their color will vary depending on their purpose.
Yellow with a green stripe is used for grounding. Do not touch it. The other wires are disconnected and shorted to each other. Plug in the appliance. If it doesn’t turn on, it indicates that the thermostat is working properly, but there are problems with the compressor or the starter relay. If the unit works, the thermostat needs to be replaced.
Tip. When you begin checking a part’s condition, record all operations on the camera. This will help when installing a new regulator.
When installing the part, it is important not to mix up the wires. Usually a black, red, or orange wire is used for the connection to the motor. Zero goes brown. Yellow with a green stripe provides grounding. Yellow, white or green wire connect to the indicator light.
In some models of appliances, in order to check and replace the part, the door is removed from its hinges. To do this, remove the cover installed over the top hinge, and unscrew the bolts hidden under it. Before removing the adjustment handle remove the plug and unscrew the fasteners. This is done with the utmost care. Reassemble in reverse order.
Checking with a tester
To find out if the thermoregulator is operational, the specialists recommend using a multimeter. To do this the part is dismantled. If the tester is an analog, put it into resistance measuring mode, set the starting point. Probes connected, pointer set to zero. Set digital tester to “200” or “Loop Test” position.
To bring the testing conditions close to the working conditions, the bellows tube is lowered into water with ice. Then measure the resistance between the terminals with a tester. If the needle of an analog multimeter is off but the digital reads 1, then the thermostat is broken. It is replaced by a new one.
How does a Refrigerator work?
Location of the thermostat
Regulator location varies with refrigerator model. For information on its design and location, see the operating instructions for the household appliance. It is usually located next to the temperature setting knob. In older household appliances, the thermostat is installed inside the chamber, under the light bulb, and covered with a protective casing. To remove the part, the handle is removed by pulling it toward you. Then unscrew the self-tapping screws and remove the housing.
In modern models, the thermostat is located on the outside, usually above the door. If it must be removed, first remove the adjustment knob. Then unscrew the screws and remove the panel with the bulb, and then take out the regulator.
Thermostat for the refrigerator
The most often used in domestic refrigerators is a mechanical thermostat K-59, which performs the function of regulating the air temperature in the refrigerating chamber and determines how many degrees it will be. This device (pictured) is a housing with switch contacts located inside, a bellows with a diaphragm and a bellows tube coming out of it, which is directly a temperature sensor.
Thermostat for the refrigerator is a separate easily replaceable spare part. Its analogue is a domestic TAM-133-1M. Refer to pictures for exterior view of mechanical temperature controls K-59 and TAM-133.
|This is what the TAM-133 thermostat looks like||and thermostat K-59|
How thermostats for refrigerators work:
Inside the bellows tube, a refrigerant similar to that found in a refrigerator system is pumped. Physical properties of this gas are such that its pressure very much depends on the temperature of the environment in which it is located. When you change it, it shrinks or expands, acting on a sensitive membrane mechanically connected to the contacts. This tube, being a sensor, is pressed to the evaporator plate and controls temperature mode of the refrigerator.
In the picture you can see that pin 6. is common and to it we connect e.g. a phase which comes straight from the plug.
Contact 4. for the wire going directly to the compressor
The diagram to the right is a diagram of a three-pin thermostat: TAM-133-1M-126.96.36.199.46.70.75,
Contacts 6-4 are basic normally open, closed when the temperature. Contacts 6-3 are additional, normally closed, open for forced switching off the refrigerator. Temperature regulators K-59, K-56, TAM-112 have a similar circuit with the same numbering of contacts.
How the thermostat in the refrigerator is connected
Connection diagram of four-pin relays K-56 and TAM-125 are similar. An alarm lamp is connected to terminal 8.
Adjusting and repairing thermostat
These products belong to the high-precision devices, adjusted in the factory, and therefore tampering with the design, as a rule, lead to nothing good. The more so that the question where to buy a thermoregulator for a refrigerator. Not such a big problem if you have internet.
Applicability of some types of relays for refrigerators
There are many models of mechanical thermostats for refrigerators, each designed for its own purpose. The most widespread are home thermoregulators of Oryol factory TAM-. and imported Danfoss K thermostats-. Widely used in refrigerators “Atlant”, “Stinol”, “Indesit.
- Sensor of temperature relay TAM-133. for use in the cooling chambers of two-compartment appliances. Analogous to. Danfoss K-59 temperature switch
- Temperature regulator for refrigerator TAM-112 is used for regulation of temperature in single-chamber refrigerators. Analogue of. ranco K-50
- The thermostat of the refrigerator TAM-125 is used in the freezing chambers of the two-chamber double-compressor refrigerators. Analog. K57
- Thermostat TAM-145. Three-pin freezer compartment temperature controller with defrost alarm (red light on control panel)
- Block temperature control refrigerator K-56. 4-pin freezer temperature controller with additional alarm terminal. Synchronous. TAM-125
You can buy thermostat for the refrigerator on Revolution Highway 31 in Biryusa Industrial Park
Repair or replacement of thermostat with your own hands
Let us consider the replacement of the thermostat individually on the example of double-chamber fridge “Atlant”. Step-by-step procedure:
- Remove the overlay covering the top hinge and unscrew the mounting screws.
- Remove the compartment door.
- Remove the plug installed on the roof of the refrigerator and remove the screw (often in the form of a hexagon).
- Remove the self-tapping screws from the rear of the cover. Remove cover.
- Remove the temperature regulator knob.
- Remove the self-tapping screws that hold the bracket and remove the temperature controller.
- Replace the unit and repeat the above steps in reverse order.
Refrigerator thermostat operation
Considered in detail the principle of the bellows for a reason. In spite of the dominance of electronics, the thermostats are still equipped with a proven element. There is no necessity to install power supply units forming undervoltage.
Stinol refrigerator thermostat repair has to be done about 5 years after the purchase of the equipment. Such is the life expectancy of the sensitive element, produced by a German company.
Longevity comes out questionable, maybe it is defined by accuracy, reliability. Consider, the answer concerns the area of unification. Refrigerator works by forming four phase states of freon:
Helps to get low temperatures. The device of the refrigerator thermal relay provides for use of freon. Why? Since freon becomes a gas inside the evaporator of the cooling circuit, it is easy to change the aggregate state inside the capillary tube of the thermorelay, which, we mentioned, is formed by two components (see. above). Have been specified, the system is filled with refrigerant, fully hermetically sealed. The tube is sealed at the free end, with freon under pressure inside, allowing it to become liquid, only when the evaporator temperature falls below the trigger threshold. Causes shock depressurization of the system, the bellows deflates.
Necessary contacts are closed and control voltage of compressor motor start relay is removed. As a result, the refrigerator stops working and the temperature stops dropping. The condition is maintained until the thermostat threshold is passed. Freon inside becomes a vapor, the pressure on the bellows increases, the bellows compresses, the contacts of the control winding of the compressor motor start are closed. Refrigerator turns on, runs until the set parameters are reached.
Now a couple of remarks about the operation of the thermostat. As mentioned above, the evaporator temperature is measured. How it happens? We are amazed at the length of the sensitive tube. Extremely long, reaches the floor if necessary. All freon is involved by the process? Change of aggregate state occurs at the very tip with the capture of a relatively small area immediately adjacent to the evaporator. A firm contact is ensured. Usually glue is used, with sealant on top. Excess coils of sealed tubing are placed in the interstitial space. A new refrigerator thermostat is being installed to replace the broken one.
Replacement of the thermal relay for the refrigerator is under force for the majority of masters, a nuance is noticed. New thermostat for the refrigerator is similar to the old type. Otherwise the result is very different from what is expected. Separate thermostats for refrigerators offer the possibility of adjustment. Experienced masters manage to solve the situation with honor. Breaking of the thermostat is often indicated by the fact that the refrigerator temperature does not nearly match the preset temperature. After turning the thermostat knob to the “off” position, wait in vain to hear the characteristic “click” sound of a well-functioning thermostat. However, the factor is not characteristic of fully electronic devices, discussed below.
The control knob, which you twist and turn to adjust the temperature, directly affects the refrigerator thermostat spring. Disadvantage of mechanical bellows in the difficulty of providing fine regulation. Setting the modes in steps. For example, home-made thermostats for TAM brand refrigerators support one or two modes. Caused by difficulties of adjustment of the spring.
The most commonly used mechanical thermostat in domestic refrigerators is the K-59, which performs the function of regulating the air temperature in the refrigerating chamber and determines how many degrees it will be. The device (picture) is a housing with switch contacts inside, a bellows with a diaphragm and a bellows tube coming out of it which is a temperature sensor.
The thermostat for the refrigerator is a separate, easily replaceable part. Its analog is domestic TAM-133-1M. External appearance of mechanical temperature regulators K-59 and TAM-133 shown in the figures below.
|This is what a TAM-133 thermostat looks like||and thermostat K-59|
How refrigerator thermostats work:
Inside the bellows tube is pumped a refrigerant similar to that found in the refrigerator system. The physical properties of this gas are such that its pressure is very much dependent on the temperature of the medium in which it is. When this parameter changes, it shrinks or expands, affecting the sensitive membrane mechanically connected to the contacts. This tube, which is a sensor, presses against the evaporator plate and monitors the temperature of the refrigerator.
In the figure you can see that contact 6. is common and to it we connect, for example, a phase goes directly from the plug.
Pin 4. For the wire going directly to the compressor
In the picture to the right is a diagram of the three-pin thermostats: TAM-133-1M-188.8.131.52.46.70.75,
Contacts 6-4 are the main normally open, they close when the temperature rises. Contacts 6-3 additional, normally closed, open for forced switching off the refrigerator. The relays of temperature regulators K-59, K-56, TAM-112 have the similar circuit with the same numbering of contacts.
How the thermostat in the refrigerator is connected
Wiring diagram of four-pin relays K-56 and TAM-125 are similar. An alarm light is connected to terminal 8.
Adjustment and repair of thermostat
These products belong to the high-precision devices, adjusted in the factory and therefore tampering with the design, as a rule, does not lead to anything good. The more so that the question where to buy a thermoregulator for a refrigerator. it is not such a big problem if you have internet.
Applicability of some types of relays for refrigerators
There are many models of mechanical temperature regulators for refrigerators and each of them is designed for its own purposes. The most widespread are the domestic thermostats by the Oryol factory TAM-. and imported Danfoss K thermoregulators-. Widely used in refrigerators “Atlant”, “Stinol”, “Indesit”.
- Temperature relay sensor TAM-133. For application in the refrigerating chambers of the two-chamber devices. Synchronous. Danfoss temperature controller K-59
- Temperature controller for refrigerator TAM-112 is used to regulate the temperature in single-chamber refrigerators. Synonym. K-50
- Temperature regulator of the refrigerator TAM-125 is used in the freezing chambers of two-compressor refrigerators. Analogue of. K57
- Thermostat TAM-145. Three-pin freezer compartment temperature controller with a defrosting alarm (red light on the control panel)
- Refrigerator temperature control unit K-56. 4-pin freezer temperature controller with optional alarm terminal. Analog. TAM-125
You can buy thermostat for the refrigerator at Revolutionary Highway 31 in Biryusa packing house