The three valves in question correspond to valves 1, 2 and 4 in the photo below (valve 3 is not installed, no problem).
Among them: valve 4 is the valve under the water heater;
How to identify valve 1 and valve 2: close 1 and 2, open 3 and 4. Then , open one of 1 and 2 respectively. Pay attention to the water heater when it is turned on. When there is a sound of water flowing through the water heater or the water outlet becomes hot, the one open at 1 and 2 is valve 2.
One of the two water valves of the solar water heater is for cold water inlet and the other for hot water outlet. If you can't tell the difference between the two, you can just turn them both off and then turn on the faucet which can put hot water on the hot water side.
Open the two water valves respectively. When one is opened, the hot water faucet begins to flow wateru. This water valve is for hot water and the other is for cold water. Valves, open them separately. If there is no water flowing from the hot water faucet, check if there is a water valve in front of the hot water faucet and open it if there is one ;
If the problem persists, there may be no water in the solar power. You can open both solar panels at the same time, water should come out from the tap which releases hot water. Try turning off a water tap. of the faucet that releases hot water, then this water valve is responsible for the hot water.
Detailed information:
When the weather is extremely hot and the water temperature is extremely high, you Must use water supply valve to limit pressure and add water. It is strictly prohibited to add water after the water is used up. Try to fill the water in the morning before sunrise orin the evening after sunset, to ensure the life of the water heater.
The power of the electric heater is 1500W. If it is used in cloudy weather or in winter when the water temperature is not sufficient, do not plug it in for a long time . The power should be turned off when taking a shower. After plugging in, if the red light on the leak protection cap lights up, it means it is heating up, and if the green light lights up, it means the water temperature has reached 65°C.
When the temperature is not too low (7℃-5℃), after running out of water at night, there is still hot water left in the water heater (water in the vacuum tube). must be filled immediately and the water heater must be lowered. The internal water temperature reduces heat loss during the night and fully utilizes thermal energy.