supermarket refrigerated showcase » article > display freezer > The structure and working principle of refrigerated showcase BCD-218W intelligent variable capacity supermarket refrigerated showcase (2)
The structure and working principle of refrigerated showcase BCD-218W intelligent variable capacity supermarket refrigerated showcase (2)
refrigerated showcase The structure and working principle of BCD-218W intelligent variable capacity supermarket refrigerated showcase
supermarket refrigerated showcase After the main control board works, the compressor is relayed , Refrigeration air door relay, variable temperature air door relay pull in. After the compressor relay is switched on, the CON2 pin and pin 2 of the main control board output 220V mains voltage, so that the compressor starts to run and cooling starts. When the refrigerating damper relay is closed, pin 1 and pin 5 of the main control board CON5 output 110V AC voltage, which makes the motor of the refrigerating damper run to cool the refrigerating room. When the variable greenhouse damper relay is closed, the 3 and 5 pins of the main board CON5 output l10v AC voltage, and the variable greenhouse damper motor is energized to transmit air-conditioning to the variable greenhouse. At the same time, the main board detects the temperature of the refrigerating room through pins 1 and 2 of the CON7 plug, detects the temperature of the warming room through pins 3 and 4, and detects the temperature of the freezer room through pins 5 and 6, and compares the detection results with the user set temperature. In comparison, if the refrigerating temperature reaches the user's setting requirements, the electric damper relay of the refrigerating compartment of the main control board is released, the 110V AC voltage on the 1 and 5 pins of the main control board CON5 disappears, the fan motor stops, and the refrigerating compartment air compartment and refrigerating compartment are closed. Stop cooling; at the same time, if the temperature of the variable greenhouse reaches the user's setting requirements, the variable greenhouse damper relay (JQI) on the main board will be released, the 110V AC voltage on the 3 and 5 pins of CON5 disappears, the variable greenhouse damper motor stops, and the variable greenhouse damper is closed . If the temperature of the three rooms of the supermarket refrigerated showcase reaches the user-set temperature, a shutdown command will be issued to release the compressor relay (J03), the voltage of pin 1 and pin 2 of the main control board CON2 will disappear, and the compressor will stop. The pin 1 and pin 3 of the main control board plug CON3 are connected to the fan motor, and pin 1 and pin 5 are connected to the defrost heater, auxiliary heater and drain heater. These three heaters are connected in parallel and work at the same time. In order to prevent the damage caused by overheating of the heater for some reason, a temperature fuse is connected in series in their main circuit. When the heating is overheated or short-circuited, the fuse is blown and plays a role of overheating protection.
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