Refrigerated trucks are specially used for the transportation of temperature-sensitive products. Truck freezer unit is the key to refrigerated trucks. If handled improperly, the goods will not be transported in a perfect state. Now corunclima introduces how to use truck freezer unit correctly to avoid the risks caused by improper use.
1. Before loading, the carriage must be pre-cooled or pre-heated for about 1.5 hours.
Because the vehicle is parked in the open air, the temperature of the compartment is usually the temperature of the outside environment. After the goods are loaded into the compartment, the ambient temperature in the compartment will affect the temperature of the goods being transported, which will lead to changes in the quality of the goods. Therefore, the compartment must be pre-cooled to the necessary temperature.
2. The freezer unit for truck must be turned off during loading and unloading.
Many people do not turn off the truck freezer unit when loading and unloading goods. This is a very wrong operation. When the truck is pre-cooled, if the door is not shut down, the fan of the refrigerating unit evaporator is working, the front of the fan is positive pressure and the back is negative pressure, so the cold air blows out from the upper part of the truck, and the lower part will be outside. The hot air is sucked in quickly, which causes the temperature in the compartment to rise rapidly; if the cargo is loaded and unloaded after the refrigeration unit is turned off, because the fan is in a stopped state, the air flow stops, and the air pressure inside and outside the compartment is the same, so that the speed of the external hot air passing into the truck is relatively slow.
3. The floor of the truck should be kept clean.
Due to the action of the evaporator fan, air will circulate in the cabin, causing debris or dirt on the ground to be sucked in by the evaporator fan. Long-term action will cause a large amount of impurities to be sucked into the evaporator coil, thereby affecting the cooling effect of the refrigeration unit.
4. Appropriate packaging is essential to protect the goods.
If the goods are frozen, unventilated packing boxes should be used. Because the wind blows over the surface of the frozen goods, the moisture in the goods will be lost, resulting in the deterioration of the goods. Due to its own characteristics, fresh goods are still breathing during storage and transportation. If they are not well ventilated, the goods will deteriorate and become damaged.
5. When loading, do not stack the goods too high, and make sure that the loading height is not higher than the plane height of the air outlet.
If the front of the air outlet is blocked by the cargo or is too close to the cargo, it will not only affect the storage and transportation temperature of the cargo, but also affect the normal operation of the refrigeration unit. Because if the air outlet is blocked by the cargo, the cold air cannot circulate normally in the compartment, which will increase the local temperature of the cargo. On the other hand, some of the defrosting designs of refrigeration units use air induction defrosting, which blocks the air outlet, which will greatly reduce the defrosting effect.
6. When loading goods, double-sided pallets must be used for loading to ensure the circulation of cold air on the ground.
It is strictly forbidden to stack the goods directly on the flat floor; plastic film cannot be wrapped on the fresh-keeping pallet, which will block the circulating cold air flow to the goods.
