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23. Product Loading
23.1 Before Loading
• Pre-cool the compartment. This will remove much of the heat from the
inside of the compartment (including the walls and insulation) and give the
product better protection when it is loaded.
• If possible, place unit in a defrost cycle immediately before loading. This
will remove moisture accumulated on the evaporator coil.
23.2 During Loading
• Stop the unit (place START/RUN-OFF switch in the OFF position)
• Check product temperature during loading
• Ensure the air returns and supply openings remain unobstructed
• Leave approximately 4 to 5 inches (100 to 125 mm) between the load and
compartment front wall for air return to the unit
• Leave at least 10 to 12 inches (250 to 300 mm) between the top of load
and the ceiling to ensure there is nothing to prevent airflow
• Load product on pallets to provide free air return to unit and improve
product protection
Proper air circulation in the compartment - air that can move around and
through the load - is a critical element in maintaining product quality during
transport. If air cannot circulate completely around the load, hot spots or top-
freeze can occur.
Pallets
The use of pallets is highly recommended. Pallets help protect the product
from heat passing through the floor of the trailer when loaded so air can flow
freely through them to return to the evaporator. When using pallets, it is
important to refrain from stacking extra boxes on the floor at the rear of the
compartment as this will cut off the airflow.
Product Stacking
Product stacking is another important factor in protecting the product.
Products that generate heat - fruits and vegetables, for example - should be
stacked so the air can flow through the product to remove the heat. This is
called “air stacking” the product. Products that do not create heat - meats and
frozen products - should be stacked tightly in the center of the trailer. All
products should be kept away from the side walls of the body to allow air flow
between the body and the load. This prevents heat filtering through the walls
from affecting the product.
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