Introduction to common problems of various drinking fountains
Warm water dispenser
When using the warm water machine, press the heating switch, the power supply is the "insulation" indicator light to indicate the power supply. At the same time, the power supply is divided into two ways: one way constitutes a heating circuit to make the electric heating tube energize to heat up; The voltage of the heating indicator "heating" indicator light. When the water in the hot water tank is heated to the set temperature, the thermostat contacts are disconnected, the heating and heating indicator circuits are powered off, the "heating" indicator light goes out, and the electric heating tube stops heating.
When the water temperature drops to the set temperature, the thermostat contacts are connected to the power circuit, and the electric heating tube reheats to keep the water temperature at 85-95°C.
The warm water distributor circuit is a dual protection component. When the temperature of the water dispenser is too high or a short circuit failure occurs, the overheating fuse will automatically melt or manually reset the thermostat to automatically disconnect the heating circuit power to protect the water. The overtemperature fuse is a disposable thermal protection element , Can not be reset, after troubleshooting, please replace the new overheating fuse according to the original model specifications, and then manually press the reset button of the manual reset thermostat to close the contact again.
Semiconductor direct cooling hot and cold water dispenser
When using semiconductor direct cooling water heaters, the direct cooling water heaters provide normal temperature water from the water tank and enter the water in two ways: always enter the cold bile water container, and then cool the cold water; the other way after entering the hot water tank , Heating hot water.
After pressing the cooling switch, the AC voltage is stepped down by the power transformer, the rectifier diode is used for full-wave rectification, the capacitor is filtered, and the DC voltage is output to cool the semiconductor refrigeration unit and the fan is exhausted. At the same time, the cooling indicator lights up. Hot and cold water dispensers do not have automatic temperature control, so the cooling indicator light is always on after the power is turned on.
Press the heating switch, the heating indicator light is on, the electric heating tube is heated, and the water in the hot water tank is heated. When the water temperature knows the set temperature, the thermostat contact is disconnected, the heating power is automatically cut off, the heating indicator light goes out, and the heating tube stops heating When the water temperature drops to the set temperature, the thermostat contacts are closed, the heating power is automatically turned on, the heating indicator light is on, and the electric heating tube heats up. Repeat the above process to keep the water temperature at a constant temperature between 85 and 95°C.
Compression refrigeration water dispenser
When the refrigeration switch of the compressed chilled water cooler is pressed, the cooling green indicator light is on, the compressor starts to run, the refrigerant vapor absorbed and evaporated in the evaporator is sucked back, and then compressed into high temperature, high temperature compressed air, and sent to the condensation Water, the device radiates to the outside air through the condenser and condenses into a high-pressure liquid, and then enters the evaporator through capillary throttling, absorbs the heat of cold bile, reduces the water temperature, and is sucked back to the compressor. This cycle achieves the purpose of cooling. , When the water temperature drops to the set temperature with time, the refrigeration thermostat contact is disconnected, the cooling green indicator light goes out, the compressor stops, the heat preservation condition is transferred, after the power is cut off, the water temperature gradually rises, when the temperature rises to the set temperature When the cooling thermostat contact is closed, the green indicator light is on, and the compressor is running. In this cycle, the water temperature is controlled between 4-12°C.
Press the heating switch, the heating circuit is turned on, the red heating indicator light is on, and the electric heating tube heats up. When the water temperature rises to the set temperature, the thermostat automatically resets, the power is turned off, the red heating indicator light goes out, the switch is turned to insulation, and the power is cut off. The water temperature gradually decreases. When the temperature drops to the set temperature, the thermostat's contacts are closed, the power is turned on, the red heating indicator lights up, and the electric heating tube is heated again. In this cycle, the water temperature is controlled between 85-95°C.
The fuse temperature fuse and manual reset thermostat in this kind of water dispenser are protection devices. When the circuit is overheated or overloaded, the protection device will automatically fuse or disconnect the circuit, thereby playing a safety protection role.