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21. Product Loading
21.1
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 the unit in a defrost cycle immediately before loading.
This will remove moisture accumulated on the evaporator coil.
21.2
During Loading
•
Stop the unit (place the START/RUN-OFF switch in the OFF position).
•
Check product temperature during loading.
•
Ensure that 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 the
load and the ceiling to ensure that 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.
The use of pallets is highly recommended. When pallets are loaded so air
can flow freely through the pallets to return to the evaporator, the product
is protected from heat passing through the floor of the trailer. 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 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 preventing heat filtering through the walls
from affecting the product.
It is important to check the temperature of the product being loaded to ensure
that it is at the correct temperature for transport. The unit is designed to
maintain the temperature of the product at the temperature at which it was
loaded. It was not designed to cool warm product.
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