When the warm water dispenser is in use, press the heating switch, and the power supply will supply power to the “keep warm” indicator light for power-on indication. At the same time, the power supply is divided into two ways: one way constitutes a heating circuit, which makes the electric heating tube energized to heat up; the other way is to supply voltage for the “heating” indicator light for heating indication. When the water in the hot tank is heated to the set temperature, the contact of the thermostat is disconnected, the power supply of the heating and heating indication loop is cut off, the “heating” indicator light goes off, and the electric heating tube stops heating.
When the water temperature drops to the set temperature, the contact of the thermostat is connected to the power circuit, and the electric heating tube reheats, so that the water temperature is kept between 85-95 ℃ over and over again.
There are two layers of maintenance components in the warm water dispenser circuit. When the water dispenser is overheated or a short-circuit fault occurs, the overtemperature stabilizer will automatically melt or manually reset the thermostat to automatically disconnect the heating circuit power supply to play a maintenance role. The over-temperature stabilizer is a one-time thermal maintenance component, which cannot be reset. After troubleshooting, replace the new over-temperature stabilizer according to the original model and specifications, and then manually press the reset button of the manual reset thermostat. .
Hot and cold water dispenser
When the semiconductor direct-cooling hot and cold water dispenser is in use, the direct-cooling hot and cold water dispenser is supplied with room temperature water from the water tank, and the water enters two ways: one way enters the cold tank container, and the cold water is refrigerated; the other way enters the hot tank, after heating hot water.
After pressing the refrigeration switch, the AC voltage is stepped down by the power transformer, the rectifier diode is used for full-wave rectification, and the capacitor is filtered, and then the DC voltage is output for the refrigeration of the semiconductor refrigeration component and the exhaust of the fan. At the same time, the refrigeration indicator lights up. Because the direct-cooled hot and cold water dispenser does not have active temperature control, the cooling indicator is always on after it is turned on.
Press the heating switch, the heating indicator lights up, the electric heating tube heats up, and the water in the hot tank heats up. When the water temperature rises to the specified temperature, the contact of the thermostat will be disconnected, the heating power will be cut off actively, the heating indicator will be turned off, and the electric heating tube will stop heating. When the water temperature drops to the required temperature, the contact of the thermostat is closed, the heating power is actively connected, the heating indicator light is on, and the electric heating tube heats up. After that, the above process was repeated, keeping the water temperature constant between 85-95°C.
Compressed refrigeration water dispenser
When the refrigeration switch of the compression type refrigeration water dispenser is pressed, the refrigeration green indicator light is on, the compressor starts to run, and the refrigerant vapor that has absorbed heat and vaporized in the evaporator is sucked back, and then compressed into high-temperature and high-pressure gas, which is sent to the condensing unit. The condenser will dissipate heat to the outside air and condense it into high-pressure liquid, and then flow into the evaporator through capillary throttling and depressurization, absorb the heat of the cold gallbladder and reduce the water temperature, and then be sucked back by the compressor. This cycle, to achieve the purpose of cooling. When the water temperature drops to the set temperature with time, the contact of the refrigeration thermostat is disconnected, the green indicator light for refrigeration goes off, the compressor stops, and it enters the heat preservation condition. After the power is cut off, the water temperature will gradually rise. When it reaches the set temperature, the contact of the refrigeration thermostat will be closed, the green indicator light will be on when the power is turned on, and the compressor will run. 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 lights up, and the electric heating tube heats up. When the temperature reaches our designated temperature, it will automatically reset the thermostat action, cut off the power supply, and the red heating indicator will subside, and it will turn to the heat preservation working condition. After the power is off, the water temperature gradually drops. When it drops to the set temperature, the contact of the thermostat is closed, the power is turned on, the red heating indicator light is on, and the electric heating tube heats up again. In this cycle, the water temperature is controlled between 85-95 °C.
In this type of water dispenser, the temperature control wire of the thermostat and the manual reset thermostat are maintenance devices. When the circuit is overheated or overloaded, it will automatically fuse or disconnect the circuit to play a maintenance role.
Air-cooled refrigerated water dispenser
Air cooling is a kind of cooling method, that is, using air as the foreword to cool the objects that need to be cooled. Usually, it is to increase the outer surface area of the object that needs to be cooled, or to speed up the rate of air flow through the object per unit time, or to use both methods. The former can be achieved by adding heat sinks on the surface of the object. Usually, the heat sink is hung outside the object or fixed on the object to make heat dissipation more effective. The latter can use fans (fans) to enhance ventilation and cooling. In most cases, the addition of heat sinks can greatly increase the cooling power.
In any case, the air used must be lower than the temperature of the object and its surface in order to take away heat. This is because of the constraints of the laws of thermodynamics, that is, it is impossible to transfer heat from a low temperature object to a high temperature object without causing other changes.
Post time: Sep-27-2022