The principle is as follows:
All the control circuits of the solar water heater are integrated on a circuit board, which has the functions of temperature control and heating.
The function of this function is to ensure that the water in the water tank will never be lower than the set temperature (for example, bath water, the water temperature is set at 45℃).
In addition, when the water level of the water tank has reached the full level, no matter how many degrees the water tank is, it will not be filled with water at this time.
Secondly, when the solar energy is short of water in the water supply process, the sensor senses the water shortage state and gives a signal to the intelligent instrument. The intelligent instrument receives the signal and gives the solenoid valve 12V voltage, and the solenoid valve automatically opens. The process of self-feeding water is completed under the condition of water shortage.
Three: When the intelligent instrument sees that the water is full during the automatic stop, the same sensor gives a signal to the intelligent instrument. When the intelligent instrument receives the water full signal, the solenoid valve is closed (12V), and the solenoid valve will be automatically closed. The process of automatic stop is completed when the water is full.
Summary:
1: When the water in the water tank exceeds the set temperature (e.g. 45℃), the solenoid valve (or water pump) for water supply is opened and cold water passes through.
Water is pumped into solar energy through electromagnetic valve (or water pump).
2: When the water tank temperature is lower than the set temperature, turn off the water supply solenoid valve (or water pump) to stop water supply.
Extended data:
The difference of different solar water supply:
When supplying water to the solar water heater, users should first know what kind of water flow control system the solar water heater at home belongs to. Different systems have different water supply modes:
1. If the overflow pipe induction is installed, the user can start the water supply function of the stepless regulating valve or the water supply ball valve to replenish water for the solar water heater. If the overflow pipe installed indoors is full of water, turn off the water supply function of the stepless regulating valve or ball valve.
2. If the integrated valve is installed, the user should open the water supply valve, and the tap water will start to supplement solar energy through the upper and lower water pipes, and it will automatically close when the water is full. When we use water, close the water supply valve and open the water switch or water mixing valve.
3. If the water supply function control system is installed, the user first clicks the water supply button of the control system, and the electromagnetic valve opens to replenish water for solar energy. When the water level reaches the set water level, the control system stops replenishing water for solar energy.
References:
Sogou Encyclopedia-Popular Science China Popular Science Encyclopedia: Solar Water Heater
Sogou encyclopedia-thermostat