refrigerated showcase supermarket walk-in cooler defrosting controller
supermarket walk-in cooler defrosting controller function
general supermarket walk-in cooler refrigeration type does not have this component, for the heat pump type air conditioner when the outdoor temperature is relatively hot in winter Low, the surface temperature of the evaporator can reach below 0 degrees, the surface of the evaporator may be frosted, and the thick frost layer will block the air flow and affect the heating capacity of the supermarket walk-in cooler. There are generally two defrosting methods: one is to stop the defrost to melt the frost by itself. This method does not work when the temperature is low, and the defrosting time is longer; the other is to defrost by heating, that is, to change the direction of the reversing valve. , Turn the evaporator on the outdoor side into a condenser.
supermarket walk-in cooler defrosting controller is also a kind of electric switch that uses temperature to control contact action. It is a special thermostat that removes the frost layer of the outdoor heat exchanger coil when the heat pump is heating. The defrosting method is generally reverse cycle thermal defrosting, that is, through the on and off of the switch contacts of the defrost controller, the electromagnetic reversing valve is switched.
supermarket walk-in cooler commonly used defrosting controllers Changchuan’s defrosting controllers mainly include bellows, differential pressure gauges and electronic defrosting controllers.
bellows type defrosting controller. Its working principle is the same as that of a bellows type thermostat. The temperature sensing bag is attached to the surface of the evaporator, when the sensing temperature reaches 0. At C, cut off the wire caster circuit of the interrogation valve, and change the supermarket walk-in cooler to outdoor heating operation. After defrosting, the surface temperature of the outdoor evaporator gradually rises, when the temperature sensor reaches 6. At C, the reversing valve coil circuit is connected, and the heating cycle to the room is restored. During the defrosting period, the indoor fan is stopped.
differential pressure gauge defrost controller. It uses a differential pressure gauge to feel the pressure difference before and after frosting of the outdoor heat exchanger to control it by itself. The high pressure end is connected to the wind side of the outdoor heat exchanger, and the low pressure end is connected to the wind side. After the heat exchanger coil is frosted, the airflow resistance increases, and the pressure difference between the front and rear changes, so that the defrosting circuit is connected, and the electromagnetic turning valve is switched to defrost. This type of defrosting is only related to the degree of frosting on the coil, so the defrosting performance is good.
electronic defrost controller. The electronic defrosting controller controls defrosting through two parameters: temperature and time. It first feels the surface temperature of the outdoor heat exchanger coil through the thermistor, and uses this to control the reversal of the electromagnetic reversing valve; at the same time, the integrated circuit controls the defrosting time. If the walk-in cooler of a heat pump supermarket often has an auxiliary electric heater, during the defrosting period, the electric heater can be activated under the control of the integrated circuit and blow hot air into the room. This article is provided by refrigerated showcase walk-in cooler
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