walk-in cooler refrigeration device and pipeline, 90% of them are leaking points: If there is a large area of ​​rust and corrosion on the middle door of the freezer side, 80% is the leakage of the internal anti-dew pipe: such as blowing The expansion evaporator freezing / refrigerator compartment evaporator has corrosion and oil stains somewhere, 80% of which are leaking points. (2) Refrigeration non-stop machine: Look at the frosting of the evaporator in the freezing and cold storage rooms. If the frosting is not solid or dissatisfied, it is caused by poor cooling: if there is too much frosting in the area, or there is no or little frosting in the area, it is the walk-in cooler that the body is detached. (3) After adding refrigerant or repairing the machine: see the compressor return pipe and capillary tube frosting. The frosting of the return pipe of the compressor is a unique manifestation of excessive refrigerant filling: the capillary frosting is a manifestation of the blockage of the refrigeration pipeline. 5. Test (1) If the machine is not cooling or running, measure the compressor's incoming line voltage to determine whether the fault is in the compressor or accessories or the compressor power supply circuit. c2) No refrigeration or poor refrigeration, but the compressor is running normally, measure (press) the pressure in the refrigeration pipeline to determine whether the refrigeration pipeline is leaking.