What is a Thermostat?
Also called a temperature controller. It is a device used to control temperature. It first measures the temperature (process variable) and then compares it to the desired value (set value). The difference between two values is called the error (deviation). Temperature controllers use this error to decide how much heating or cooling is required to bring the process temperature back to the desired value. Once this calculation is completed, the controller will produce an output signal that affects the change required. This output signal is known as the manipulated value and is normally connected to a heater, control valve, fan or some other “final control elements” which actually increases or removes heat from the process.
Application: induction cookers, refrigerators, electric cookers, air conditioners, etc.
How does the Refrigerator Thermostat Work?
The thermostats control the start time and stop time of the compressor through the temperature sensor put in the refrigerator case to adjust temperature and control defrosting.
What Types of Temperature Controllers We Use for
Our Commercial Refrigerators?
Mechanical Controller
The Mechanical temperature controller is a temperature controller which adjusts temperature through the design of mechanical and physical reactions. It has the characteristics of convenient maintenance and low price. But it has short service life and its inaccurate temperature control will lead to unstable temperatures in the refrigerator. Below are our commercial fridges or freezers that come with the mechanical thermostat as standard. As you know, it could be custom with the digital controller if you need it.
Digital Controller
The digital temperature controller is a temperature controller which adjusts temperature through circuit electronic technology. It has the characteristics of convenient operation and high control precision. But it is expensive, and due to the complex structure, it is inconvenient to repair. Below are our commercial fridges or freezers that come with the digital controller as standard. As you see, the dynamic cooling freezers must have a digital thermostat for automatic defrosting.
Digital Controller
The digital temperature controller is a temperature controller which adjusts temperature through circuit electronic technology. It has the characteristics of convenient operation and high control precision. But it is expensive, and due to the complex structure, it is inconvenient to repair. Below are our commercial fridges or freezers that come with the digital controller as standard. As you see, the dynamic cooling freezers must have a digital thermostat for automatic defrosting.
Differences between Mechanical and Digital Controller
| Type |  Mechanical Temperature Controller |
 Digital Temperature Controller |
|---|---|---|
| Composition Structure | Temperature sensor, temperature sensing cavity and contact switch. | Temperature sensor and circuit board. |
| Brands | Tongda, Huishang | Carel, Jingchuang(Elitech), Eliwell |
| Working Theory | Through the “thermal expansion and contraction” of the temperature sensing tube, pressure is generated in the temperature sensing cavity to control the start and stop of the compressor start circuit. | The setting of the circuit board controls the start and stop of the circuit of the compressor according to the temperature detected by the temperature sensor. |
| Control Precision | Low. Can only control the temperature range. (Appendix 1) | High. Can control accurate temperature value. |
| Way to Adjust Temperature |  Rotate the button to control the frequency of the compressor’s start and stop, so as to reduce or increase the temperature in the refrigerator. The higher the gear, the lower the temperature, and vice versa. |
 Adjust the circuit program by pressing buttons and observe the temperature on the display to achieve preset temperature. |
| Defrost | No defrosting function. An external defrost timer is needed to assist in defrosting. | With defrosting function. The default setting is defrosting every 6 hours for 20 minutes. |
| Cost | Around 12 $ | Around 35 $ |
Manuals
Appendix 1
The temperature range corresponding to each gear of the mechanical thermostat
Due to the structural reasons of the mechanical temperature control itself, its gear does not represent an accurate temperature value, but a temperature range. The 1st gear represents the highest temperature. The 7th gear represents the lowest temperature. The factory setting of our fridges is generally in the middle gear, that is, the 4th gear.
| Gear | On (°C) | Off (°C) | Temperature Range (°C) |
|---|---|---|---|
| 1 | 9.5±2 | 5.5±2 | 5.5~11.5 |
| 2 | 9±2 | 5±1.5 | 5~11 |
| 3 | 8±2 | 4±1.5 | 4~10 |
| 4 | 7.5±1.5 | 3.5±1.8 | 3.5~9 |
| 5 | 6 ±1.5 | 3±1.5 | 3~7.5 |
| 6 | 5±1.5 | 1±1.5 | 1~6.5 |
| 7 | 3.5 | -0.5 | -0.5~3.5 |
Grow Your Business with Us Now
