Other accessories of the refrigeration system include: drying filter, mirror, hot gas bypass valve, liquid receiver, fan pressure switch and water volume regulating valve, vapor-liquid separator, high and low pressure protection switch, drainage device, etc.

1. Drying filter: filter the water and particulate impurities in the Freon system to remove the danger of acid substances.

2. Mirror: a. Observe the flow of freon and the status of the system; B. Observe whether there is water in the freon of the refrigeration system.

3. Water volume regulating valve (fan pressure switch): controls the refrigerant high pressure in the refrigeration system, plays a stable high pressure, and ensures the high pressure.

4. Hot gas bypass valve (hand valve): control the low pressure of refrigerant in the refrigeration system, i.e. evaporation temperature, to prevent ice blocking in the evaporator.

5. Liquid receiver: ensure that the air condenser has sufficient heat dissipation area.

6. Vapor-liquid separator: collect and store liquid refrigerant to ensure that only gaseous refrigerant enters the compressor to prevent liquid hammer.

7. High and low pressure protection switch: it can protect the compressor itself to prevent the compressor motor from burning. When the discharge pressure of the compressor exceeds the set value or the suction pressure is lower than the set value, the pressure control switch automatically cuts off the circuit, making the compressor stop and play a safety protection role. Generally:

High pressure setting value: 2.5Mpa

Low pressure setting value: 0.2Mpa

8. Fan pressure switch: controls the start and stop of the fan. Generally, the fan will start automatically when the high pressure pressure is 1.4Mpa, and stop when the pressure drops to about 1.1~1.3Mpa. The difference from the high and low pressure switch is that the fan pressure switch has no reset device. Set value: 1.4Mpa

The set value of the pressure switch has been adjusted in place when the cold-drying machine leaves the factory. Generally, do not adjust it.