Solar hot water system how to properly use thermostatic mixing valve

Self-temperature thermostatic mixing valve looks like a 4-way valve, there are three valve ports, a temperature control button. Two of the three ports are hot and cold water inlet, the other is the thermostatic water outlet. In the water outlet is equipped with a thermal element, the use of temperature characteristics of the components to promote the movement of the spool valve body, plugging or open cold, hot water inlet, blocking cold water at the same time open the hot water. When the temperature adjustment knob to set a water temperature, regardless of hot and cold water temperature, pressure changes, the proportion of hot and cold water into the outlet also changes, so that the water temperature is always constant. At present, most domestic manufacturers of solar water heaters using hot and cold water valve or duckbill mechanical mixing switch for mixed water temperature control. As the hot water temperature generated by solar water heaters vary greatly, large hot and cold water pressure, each time before use must be repeatedly adjusted, bathing water pressure, water temperature changes, but also produce hot and cold conditions. Individual manufacturers imported foreign thermostatic mixing valve, as an optional product for the user selection, due to the price is too high, thus limiting its promotion. In response to the needs of the domestic market, Beijing Hao Yu Sunshine Electronics Center developed specifically for the use of solar water heaters with a diameter of 15mm mixing valve, the price of only 20% of foreign products, performance characteristics and specifically for the use of solar water heaters , And applied for a national patent. The following describes Beijing Hao Yu Sunshine Electronics Center production water heater thermostatic mixing valve experiment and use. 1, the water flow test: When the hot and cold water inlet pressure are 0.1Mpa (1kg), the water output of 0.98m3 / h (that is, more than 16L per minute) can theoretically drive three showerheads. Due to solar hot water pressure may be only 0.25kg ~ 0.3kg, in order to maintain a constant temperature, a mixing valve is best equipped with only a shower nozzle. If you can raise the pressure, with more nozzles. 2, hot and cold water pressure differential products to allow hot and cold water pressure is 8: 1. Cold water pressure does not exceed 2.5kg, the water heater pressure 0.3kg, you can normally mixed water. If the cold water pressure instability, may be higher than 2.5 kilograms, it is necessary to install a cold water pipe on the limit valve, such as the "billion home" water heater is equipped with a limit valve on each machine. If the installation of manual high resistance valve can be used as a cold water switch, but also regulate the flow, to ensure that the pressure is not value. 3, safety performance - Anti-scalding function with automatic hot and cold water inlet closure performance. Use, if the cold water off or off, within seconds, the hot water will automatically shut down to ensure that people will not be scalded. The required number of seconds, the temperature sensing element to the spool to move the implementation of hot water to shut down the time required for hot water temperature is higher, the shorter the closure time, if the hot water temperature above 80 ℃, as long as two or three seconds shut down. Water heater scald accident is often caused by misuse, solar water heaters equipped with thermostatic mixing valve is equivalent to the installation of anti-hot safety valve. Some foreign countries (such as New Zealand) on the installation of solar water heaters require the installation of thermostatic mixing valve, in addition to ease of use, water conservation, but also consider the safety factor. 4, automatic check and use before discharge hot water pipe cooling water bath temperature is about 40 ℃, thermostatic mixing valve set temperature, hot and cold water inlet full open, the water supply to the outlet; to stop using When the outlet is closed, because of cold water pressure, will be a certain amount of cold water to the hot water pipe, and the valve body temperature sensor due to the role of cold water, will gradually close the cold water outlet and open the hot water outlet, the entire water system Will be still. Taking into account the cold water pressure, and the mixing valve is closed by hot and cold water pressure spring, water seal is temperature rubber, the seal may have leakage, if the water tank is not full, it can only be automatic Sheung Shui, and If the water tank is full, it is necessary to install a closed valve on the cold water pipe. When bathing again, open the outlet switch, because the cold water door is closed, the first out of the hot water pipe cooling water, when the high temperature water flow, the temperature sensing element will be action, turn off the small hot water outlet, open the cold water outlet, automatically Thermostat adjustment. 5, after the thermostatic mixing valve for the water tank thermostat thermostat valve thermostat marked the arrow pointing to 55 ℃ and 25 ℃, on behalf of the direction of temperature, water temperature is appropriate, stop spinning is the temperature you need to set. The end of the high temperature direction is to turn off the cold water; the end of the low temperature direction is to turn off the hot water. After testing, the mixing valve to turn off the cold water state, if the hot water temperature exceeds 55 ℃, the cold water outlet will automatically open; turn off the hot water state. Cold water below 5 ℃, the hot water will not be completely closed. In order to achieve Sheung Shui function, we must try to make hot and cold water openings open at the same time, and open the cold water switch. The adjustment knob can rotate more than 720 ° (two circles) when it is adjusted from 25 ° C to 55 ° C. The rotating section with two water intakes open at the same time does not exceed 90 °, and sometimes only 45 ° rotation. Find this rotating section, Hot water all open, close the outlet to achieve the purpose of Sheung Shui. Under normal room temperature conditions, the cold water temperature is generally between 5 ℃ ~ 25 ℃, when the bath is stopped, the mixing valve body temperature is the pressure of cold water temperature. As described earlier, when the water temperature is set at 40 ℃, stop the cold water after the bath will automatically shut down. If you then adjust to the low temperature direction, it will open the cold water outlet. In the case of poor determination, you can first adjust the knob to the end of the low temperature direction, the winter (assuming cold water temperature 5 ℃ ~ 10 ℃), then callback 45 ° (1/4 turn), summer ~ 25 ℃) callback 90 °, you can enter the two water inlet at the same time open the state, open the cold water valve to complete Sheung Shui. To prevent water from overflowing, close the valve in the cold water pipe and close the water pipe when the water heater is not used. The above description to be more practical use of the test, I hope more users and solar energy engineering and technical personnel to participate in research, research. I believe in the near future, there will be more user-friendly fool solar water heater market, solar water heaters to energy-saving, water-saving, safe and convenient direction.

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