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Classification and Selection of Floor Heating Thermostat

Article Source:Thermal protectorAuthor:YaxunPopularity:Published time:2019-06-09 18:37

Ground heating can be divided into "electric heating" and "water heating" from the form of heating source.
The main components of the former: heating cable (or electric heating film and other electric heating load placed on the ground) + thermostat, the system composition is simpler;
The main components of the latter: Hot water source equipment + water collector (and terminal accessories) + ground heating pipe + electric valve and actuator (or electric valve) + temperature controller, material selection, construction technology and operation and maintenance are more exquisite than the former.
The commonality of the two needs to be equipped with a thermostat, and the visible floor heating thermostat is crucial in the floor heating system.
Floor heating thermostat type

Mechanical floor heating thermostat
01 Mechanical floor heating thermostat
A temperature-controlled switch that uses a sensitive gas capsule or a heat-sensitive bimetal as a temperature sensing element to form a mechanical contact.
There are many such thermostats in Europe and the United States, and only a few manufacturers in China promote such products. The mechanical floor heating thermostat usually has a contact current of no more than 8A, which is suitable for opening and closing the control valve in the water heating system.
Advantages: low cost, simple installation and use, and long-term reliability;
Disadvantages: The temperature control switch has a large deviation (generally greater than ±3 °C), the display is not intuitive enough, and the function is relatively simple;
Electronic floor heating thermostat

02 Electronic floor heating thermostat
The temperature sensing element is a negative temperature coefficient thermistor (NTC), and the relay contact controls the output. According to the contact current size, the conventional specifications are 3A, 5A, 8A, 16A, 20A, which can meet the control requirements of electric heating system for water heating system and large load (below 400W).
Advantages: low cost, simple operation, high temperature control accuracy (±1 °C), etc.
It is superior to mechanical thermostat in terms of function. For example, the temperature sensor can be installed in various positions, including built-in (inside product panel) and external (external ground probe) or built-in temperature control and external temperature limit; Individual brand products also have energy-saving programming capabilities. Just add a time-controlled programmer of about 100 yuan, connect the energy-saving control points of dozens of thermostats in the same area to the time-controlled programmer, and realize reasonable energy-saving control.
When you are not at home, you can automatically reduce the set temperature by 5 °C. The electronic thermostat continues all the advantages of the mechanical thermostat, greatly improving the insufficiency of the mechanical thermostat in terms of functions, and the intelligent control degree basically meets all applications. Therefore, it is widely used in China, especially for children and aging populations.
Due to the simple operation and long-term reliability, there are also many rational “simple” young families who are particularly popular.

LCD display floor heating thermostat
03 LCD display floor heating thermostat
The liquid crystal display temperature controller is applied in the floor heating system, which fully reflects the intelligent, automatic and personalized consumption concept of the floor heating system.
The popularity in China is much higher than that in Europe and the United States. Therefore, there are many forms and varieties in China, and the quality is also uneven.
Part of the liquid crystal display floor heating thermostat status:
1) The LCD interface is too large or the display symbols are not commensurate and not standard.
2) The terminals or circuits (components) that control the output cannot withstand large currents.
3) The external sensor (ground probe) cable is a thin flexible cable and cannot be inserted into the embedded tube. It is also a hidden danger in future maintenance.
4) The control logic does not match the requirements of the floor heating system, resulting in functions that are not dedicated or practical.
5) Only one temperature control circuit can not achieve “internal control outer limit”. That is, it is impossible to measure and control the room air temperature, and at the same time limit the ground temperature.
6) The overall shape is thin and the structure is unreasonable. The installation initial adjustment failure rate is higher and the long-term stability is worse.

04 week programming period control floor heating thermostat
The weekly programming period controls the floor heating thermostat, which is one of the liquid crystal display type floor heating thermostats (warmly called it: liquid crystal intelligent thermostat).
With a cycle of one week, six time periods and corresponding set temperatures can be set each day, and can be changed to manual or temporary control operation mode.
Common factory default time setting parameters:
Adopting the weekly programming time control method is another energy-saving revolution in heating self-control.
It not only ensures comfort, but also reflects energy saving, environmental protection and health. And has a lot of personalized needs, such as: the choice of work mode (single or double break, no rest), early preheating, energy monitoring, key lock and other functions.
The correct use of the time period to control the thermostat, saving energy will be greater than 30% (compared with non-time control thermostat). For example, in the charging city of electricity price peaks and valleys, the application of energy saving in electric heating systems is more significant.
LCD intelligent thermostat

05 wireless control floor heating thermostat
Radio frequency wireless 433MHz transmission, foreign products have mature products but few applications. In the past, wireless control thermostats were limited by factors such as installation distance, poor reception stability, high cost, and short battery life. In addition, our country is basically a newly built property, and wiring is very convenient when it is first installed. Very little used in our country. Now with the increase of renovation projects, the wireless transmission technology continues to mature, and the market demand is very large.

06 Special use of thermostats in aquaculture industry
Considering the harsh breeding environment such as pig farms, the conventional household electronic thermostat circuit board is subject to ammonia gas and moisture corrosion for a long time, and the service life is very short. The use of a fully sealed plastic case and an infrared remote control thermostat is ideal for this harsh environment. The only drawback is that the heat generated by the internal heat-generating components of the sealant shell can not be dissipated, and the load power can only be 1200W or less.
07 high power temperature control box
Large halls, conference rooms, greenhouse breeding, etc. require negative nuclear to reach 10KW-30KW or more. Bringing more trouble to construction and wiring. The installation of multiple thermostats affects the aesthetics and practicality. The advent of the high-power temperature control box has solved this problem perfectly, with a maximum power of 40 kW. The disadvantage of the high-power temperature control box is that the sound is relatively large when starting and stopping, and it is not suitable for a quiet environment.

08 power expansion module
Some relatively large rooms, the load power exceeds the conventional thermostat load power. When the load capacity of the thermostat is not up to standard, it can be solved by using the thermostat expansion module (warm-called it: temperature control module), each module can increase the resistive load by 3000 watts. The load of each level of module, start and stop will operate simultaneously with the temperature controller load, and there may be delay. One temperature controller can be equipped with multiple power expansion modules. The use of the expansion module solves the problem of installing multiple thermostats in a high-power load room. The module can be installed in 86 boxes 30 cm away from the ground.

09 remote centralized control thermostat and system
Small systems generally rely on the Internet, fixed-line communications, and GPRS for remote monitoring.
A typical application example is: Telephone remote control, households use the phone, mobile phone to monitor or set their own thermostat switching time, set temperature and so on. Large-scale systems are used in large buildings, and control points range from a few hundred to several thousand to achieve centralized control of the terminal area. Using computer network technology and computer software to monitor, analyze, manage and record the operation of the entire system in the control room. The application of remote (concentrated) control technology to the floor heating temperature control system is rarely implemented abroad, and there have been many successful cases in domestic applications in recent years. Warm-up believes that we must carefully select the supporting service manufacturers before choosing.

Floor heating thermostat installation and use should pay attention to the problem
1. Wall mounting, height is about 1.2-1.4 meters, generally on the same horizontal line as the home electrical lighting switch.
2. Installed on the wall where the surrounding air flows freely, and is not affected by other heat sources (such as sunlight), door and window airflow or external wall temperature.
3, pre-embedded electric cassette, select the standard 86 type cassette, it is recommended that the depth of the cassette should reach 50mm