1. Check whether the placement position meets the requirements. 2. Check whether the accessories are complete according to the packing list. Read the product manual in detail and conduct a comprehensive inspection according to the requirements of the manual. 3. Check whether the power supply voltage meets the requirements. The power supply used shall be 220V, 50Hz single-phase AC power supply. During normal operation, the voltage fluctuation is allowed to be between 187-242V. If the fluctuation is large or high or low, it will affect the normal operation of the compressor, or even burn the compressor. 4. Single phase three hole seat checking and separate wiring shall be applied. Users without grounding device shall install grounding wire. When setting grounding wires, tap water and gas pipes cannot be used as grounding wires, nor can they be connected to telephone lines and lightning rods. 5. Do not damage the insulation layer of the power line, do not press the wire heavily, and do not change or lengthen the power line at will. 6. After checking, let the refrigerator and freezer stand for half an hour, switch on the power supply, carefully listen to whether the sound of the compressor during startup and operation is normal, and whether there is the sound of pipes hitting each other. If the noise is too loud, check whether the products are placed stably, whether the pipes are in contact, and make corresponding adjustments. If there is a loud abnormal sound, the power supply should be cut off immediately and professional repair personnel should be contacted. 7. Before storing food, refrigerators and freezers should run without load for a period of time. When the temperature in the box drops, food can be put in. The stored food should not be too much. Try to avoid refrigerators and freezers working at full load for a long time