Solar water heater water supply circuit

The solar water heater water automatic control circuit
is shown in Figure 1-38. In the figure, Y is the water inlet electromagnetic
port of the fully automatic washing machine. Coils L and SA are replaced by the AC
power switch of a color TV .
    (1) In the automatic water supply process, transformer T, VD1,
VD2, and C are repaired into a full-wave rectifier circuit to provide
power for the control circuit. VT1 and VT2 form a composite transistor, which not only increases
the power but also increases the amplification factor. A and B are connected to
two-core wires at both ends, which are used as electrodes. The two-core wires extend from the overflow pipe to
near the overflow port of the water tank. When you need to fill the water, press the self-locking
switch SA, YV will be powered on to fill the water, the water filling indicator
LED will light up, and VT1 and VT2 will be cut off at this time.
    (2) Water overflows When water overflows, point A is connected to point B through the water, VT1 and VT2 are turned on, coil L in SA is energized, SA is unlocked and reset
, the entire circuit is automatically powered off, and the water supply is completed.
    In this device, the water inlet solenoid valve is connected in parallel with the original water supply valve to facilitate manual water supply during a power outage.