Working principle
1. Water tank and water channel: water enters the raw water tank. The water level rises and the float causes the water inlet valve to close. Float switch s2 acts. The electric heating tube heats the water, and after the water is boiled, the boiling water is forced into the water storage tank by steam.
When the boiling storage tank is full of water, the float SL moves and the constant temperature electric heating tube works. Keep boiled water available for drinking. When the water level in the raw water tank drops and the float drops, the water inlet valve is opened to add water, and the cycle process is repeated. Repeatedly to ensure the normal supply of boiled water.
2. Electric heater control circuit: Turn on the OS and the main circuit is powered. The LEDl light is on. When the water level in the raw water tank reaches the set water level. Water level control switch S2 is closed. The coil of contactor KM1 is electrically activated. When the main contact is closed, the heating tubes EHl~EH3 are electrically heated, and the boiled water enters the water storage tank. If the boiling water reserve is insufficient, the insulated electric heating pipe EH4 will work. If the boiling water reserve reaches the set value, Sl will act.
Wll is connected to contact O2. The coil of contactor KMl is reset when the power is off, and the main contact disconnects the power supply of the EHl-EH3 heating tube.
Stop heating. at this time. The coil of AC contactor KM2 is electrically activated, and the contacts of KM2 are closed. EH4 is powered on and put into heat preservation. During the heat preservation process, the temperature of the boiling water is controlled by the temperature control switch sTl water outlet and ST2. When it is lower than the set temperature of sTl and ST2. The temperature control switch automatically powers on and adds heating; if the temperature is higher than the set value, the temperature control switches STT and ST2 automatically cut off power and stop heating.
When the water tank is short of water, the water level switch S2 automatically cuts off the power supply, ensuring that the heater immediately cuts off the power supply when there is no water or insufficient water. When the boiling water reserve is insufficient. The water level switch S1 is also automatically disconnected, and the insulation heating pipe does not participate in heating. sA is the reboil button.