Refrigeration knowledge

Precautions for use of refrigeration air cooler

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Precautions for installation, use and maintenance of cold storage air cooler


Inspection before installation:


1. After removing the outer package of the cold air cooler in the cold storage, check whether the components are loose. If they are loose, retighten them.

2. Check whether the axial flow fan blade is firmly installed on the motor shaft, and whether the fan blade and the protection collide.

3. If the cooling fan is damaged or deformed due to transportation, it shall be repaired before hoisting.

4. Before leaving the factory, the air cooler is equipped with nitrogen for pressure maintaining and capillary sealing. Remove the sealing capillary before installation. If there is air flow sound, it indicates that the evaporator pipe of the air cooler is well sealed and can be used safely. If there is no air flow sound, it means that the evaporator pipe has leakage, and it should be checked before installation.


5. If there is no design drawing, the distance between the installation of ceiling type air cooler and the wall (the fan diameter is 400mm or less) shall be 350-500mm, so as to facilitate the circulation and maintenance of cold air in the cold storage. If there is a design drawing, install according to the position and size of the design drawing.

6. The drain pipe of the air cooler shall have a certain slope to the outside of the cold storage, so that the defrosting water can be discharged smoothly. If necessary, for example, the air-conditioning warehouse needs to consider the U-bend water seal for drainage.

7. When the temperature of large cold storage or warehouse is lower than - 20 ℃, an electric heating pipe shall be added in the defrosting drain pipe to prevent the defrosting water from freezing and blocking during the drainage process.

8. When installing the expansion valve, the temperature sensor must be fastened on the upper part of the horizontal air return pipe and ensure good contact with the air return pipe. Moisturize the outside of the air return pipe to prevent the temperature sensor from being affected by the warehouse temperature.

9. When installing the air cooler, it should be considered that the air outlet should avoid opening the beam or column, so as not to affect the air supply range.

10. The electrical junction box of D-type Freon ceiling type air cooler is designed on the left side of the front of the air cooler. The junction box has two types of small power defrosting electric heating pipe terminals with a size of less than 22 ㎡, and the second type of defrosting electric heating pipe terminals with a size of more than 30 ㎡ all adopt the Y-type connection method. Since the load of the three-phase electric heating pipe is unbalanced, the user must connect the neutral wire when wiring, In addition, if one phase electric heating tube is overheated and burnt, it will not lead to overload of the other phase electric heating tube.

11. The air cooler shall be properly arranged according to the range of the air cooler to ensure that the air supply in the warehouse is uniform without dead space.


Inspection during operation and maintenance:


1. Check that the electric heating and fan cannot operate simultaneously when the low-temperature cold storage is running, that is, when the defrosting electric heating pipe is connected, the fan motor power must be disconnected to prevent the hot air from blowing into the warehouse during defrosting. Except for the designed automatic heating fresh-keeping warehouse in winter.

2. The defrosting cycle is automatically accumulated by the computer control box. The customer should adjust the defrosting cycle and time according to the frosting condition of the air cooler according to the frequency of incoming and outgoing goods and the stored items. If necessary, defrost manually or start defrost control circuit.

3. There is a delay function after defrosting. When defrosting is over, the fan of the air cooler cannot be started immediately to prevent freezing the fins of the air cooler.

4. Regularly check whether the fan and defrosting function are normal, and whether the motor of the air cooler is normal. Regularly clean the frost layer on the fins to ensure the cooling effect.