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Commercial supermarket supermarket refrigerated showcase working principle decomposition
supermarket supermarket refrigerated showcase temperature controller (referred to as thermostat). The temperature controller in the air conditioner can automatically control the temperature of the room to keep the temperature of the air conditioner room within a certain range. There are three types of thermostats commonly used on air conditioners:
bellows type thermostat. Supermarket supermarket refrigerated showcase window air conditioners often use this kind of thermostat. This is a pressure type thermostat, the basin, capillary tube and bellows are filled with temperature sensing agent. The temperature sensing bulb is placed at the return air vent of the air conditioner, and it can directly feel the indoor temperature. When the indoor temperature changes, the bellows expands or contracts. The lever structure controls the opening and closing of the micro switch, thereby controlling the rotation of the compressor. Stop to keep the room temperature within a certain range.
The temperature of the internal and outdoor heat exchanger pipes in the supermarket refrigerated showcase is below one lOC. At this time, the defrost controller action b. The coil of relay J1 is connected between the V and L wires. Since the voltage of the two wires is 220V, there is no voltage between the two wires, so the JI coil is not energized.
heating operation is more than 50nzin. When these two conditions are met at the same time, the main control circuit board issues a command to stop the indoor fan, and the four-way valve is de-energized, and the V line voltage becomes zero, so the coil of JI is energized, and the normally closed contact of J1 is disconnected. Stop the outdoor fan. At this time, only the compressor works and the air conditioner enters the defrosting operation. When the temperature in the supermarket refrigerated showcase and the outdoor heat exchanger pipeline rises to reset the defrosting controller, or the defrosting operation time is more than 10min, the main control circuit board issues a command, the room breaks the barrier and the four-way valve is energized. The outdoor fan also operates, and the air conditioner starts heating operation.
This article is provided by refrigerated showcase supermarket refrigerated showcase
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