Carrier X Series Operator's Manual page 17

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.
It is important to check the temperature of the product being loaded
to ensure that it is at the correct temperature for transport. The
refrigeration 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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