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display cooler temperature controller
author: supermarket refrigerated showcase category: walk-in display coolers Views: 575Time: 2016-08-22
display cooler temperature controller
temperature controller The temperature sensor is fixed on the surface of the evaporator. When the temperature sensed by the temperature sensor reaches the set requirement, the temperature controller automatically disconnects, cuts off the compressor power supply, and stops cooling . After a period of time, as the temperature in the display cooler increases, when the thermostat senses that the temperature reaches a certain value, it will automatically switch to the on state, and the compressor will be powered again, and the compressor will operate again for cooling. When the door of the refrigerator compartment is closed, the door light switch located in the door frame of the refrigerator compartment is squeezed and disconnected, the power supply of the door light is cut off, and the refrigerator compartment light is off. But when the refrigerator door is opened, the door light switch pops up and is in the on state, so that the door light forms a loop and emits light. Added a running capacitor and temperature compensation device. The running capacitor increases the torque of the motor, increases the power factor and reduces power consumption. The temperature compensation switch and the compensation electric heating components form a low temperature compensation circuit to prevent the display cooler from not starting or stopping for a long time when the ambient temperature is too low, causing the refrigeration temperature to be too cold and the freezer temperature to be too high. Because the
low-temperature compensation circuit is connected in parallel with the thermostat, the operation of the
compressor is opposite to each other. When the contacts 2 and 3 of the thermostat are connected, the compressor will be energized and run for cooling, and the low-temperature compensation circuit will be short-circuited to prevent heating. When the temperature in the display cooler reaches a predetermined value, the thermostat terminal contacts 2 and 3 are disconnected, the compressor is switched to supply power, and the compressor stops to stop cooling. At the same time, the temperature compensation switch and the compensation electric heating component are energized to work through the compressor, and the current flow is: the power plug end thermostat 1, 2 terminals-> temperature compensation switch-> compensation electric heating component-> overload protector-> compression The machine runs winding a > power plug end. Due to the low power and high resistance of the heating components, the high power and low resistance of the compressor, the voltage applied to the display cooler compressor is only a few volts. With such a small voltage, the compressor will neither work nor generate heat. . Therefore, the heating element has almost no effect on the compressor when it is heated.
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