Interior fans: Interior fans are installed inside the refrigerated container and help spread air to promote adequate temperature control and stability. Control unit: The control unit sets and adjusts the internal climate of the reefer container, including the temperature, alarm conditions, and in some cases, ventilation and humidity levels.
Fresh air vent: The fresh air vent hole lets air enter from outside, and any gases from the container, such as fruit-ripening ethylene gas, can leave.
Unit evaporator: Excess moisture in a reefer can harm products, quicken food spoilage and break down packaging, leaving contents vulnerable. The unit evaporator helps preserve the humidity inside the container. The reefer unit evaporator can either heat or cool the air that circulates past it from the fan. Heating capacity is using either hot gas heat or electrical heating elements.
Condenser: Air-cooled models pull cooled air from the top of the container and discharge it under the cargo, pushing the air to the back doors before it convects naturally and rises, flowing back over the load to the return air inlet on the reefer unit. Because air moves under the cargo, proper loading and covering as much of the floor as possible is critical to prevent a “chimney” effect and short cycling.
Voltage transformers: Dual voltage transformers are also an option with some containers, allowing operation on
voltages down to 200V.