Only by using and operating refrigerated trucks correctly can the goods be transported and stored in good condition. A qualified refrigerated truck should ensure good ventilation conditions on all six sides of the compartment and no obstacles.

Because good air circulation is a key element in ensuring the appropriate temperature of goods. When the cold (hot) gas blown out by the refrigeration unit isolates the cold (hot) source entering the carriage from the goods, the quality of the goods can be protected.

If there is a blockage in a certain position inside the compartment, the cold (hot) source of that part will directly enter the goods, causing a change in the temperature of the goods.

At the same time, it is necessary to ensure that the return air shutter is in good condition and not blocking the inlet of the evaporator (return air). Insufficient return air can cause irregular circulation of cold air, resulting in inconsistent temperature inside the compartment and freezing of the top cargo.

When loading the refrigerated truck, the goods should not be stacked too high, and the loading height should not be higher than the plane height of the air outlet. Because if the air outlet is blocked by goods or too close to the goods, it will not only affect the storage and transportation temperature of the goods, but also affect the normal operation of the refrigeration unit.

Due to the blockage of the air outlet by goods, the cold air (or hot air) cannot circulate normally in the carriage, resulting in a local increase in temperature of the goods. On the other hand, due to the defrosting design of the refrigeration unit using air induction defrosting, when the goods are too close to the air outlet.

The coils inside the evaporator of the unit will quickly frost (or ice), and the air induction switch will immediately operate. The unit will quickly enter the defrosting state, and when the temperature rises to 9 ℃, defrosting will immediately end. This cyclic defrosting operation will cause the temperature inside the compartment to not drop, increasing equipment wear and tear.

You should know that the refrigeration unit of a refrigerated truck is not used to lower the temperature of the goods, but to maintain the temperature of the goods. When the external cold (heat) source radiates, conducts, and convection into the compartment, it is carried away by the cold air blown out by the refrigeration unit to isolate the heat source from entering the goods.

Therefore, when loading, the temperature of the loaded goods should be measured first. If the set point temperature of the refrigeration unit is higher or lower than the temperature of the goods, it will be difficult for the temperature of the goods in the carriage to reach the required temperature.

The storage temperature of the goods should be consistent with the transportation temperature. If the temperature changes frequently, it will cause the loss of moisture in the goods, resulting in a change in quality and shortening the shelf life of the goods.

When using a refrigerated truck, it is also important to keep the interior of the compartment clean. Due to the action of the evaporator fan, air will circulate inside the cabin, causing debris or dust on the ground to be sucked in by the evaporator fan.

If this continues for a long time, a large amount of impurities will be sucked into the evaporator coil, and the coil will be surrounded by impurities, resulting in a decrease in heat exchange rate.

So, after using refrigerated trucks for a few years, users usually feel that the cooling effect is not as good as before, not only due to vehicle malfunctions, but also because the coils are too dirty. Therefore, ensuring the cleanliness of the carriage floor is the key to ensuring the normal operation of the refrigeration unit.