Thermo King SL Manual De Instrucciones página 38

Bulkhead Design Recommendations
Return Airflow
Restrictions of the return airflow adversely affects the performance of the unit. The area
directly behind the evaporator return air inlet must not be restricted. Thermo King
recommends using a bulkhead.
General Bulkhead Design
A bulkhead is used to keep the return airflow from being restricted if the load shifts. The
bulkhead prevents the load from shifting into the return airflow passageway on the front wall
of the trailer. Note the following items when designing and installing a bulkhead:
• The bulkhead should be designed to use the absolute minimum area in the return airflow
passageway.
• The bulkhead should maintain the maximum return airflow area and it should not
restrict the airflow to the return air inlet.
Bulkhead Dimensions
• The bulkhead cannot allow the air to short cycle in the upper cargo area between the
discharge air outlet and the return air inlet. It is not necessary to seal the top of the
bulkhead but it must fit tight enough to prevent short cycling.
• The bulkhead must allow the return air to travel vertically and horizontally to the return
air inlet.
• The minimum allowable air gap between the bulkhead and the evaporator return air inlet
is 15 mm (0.50 in.).
• The minimum allowable depth for the return airflow passageway between the bulkhead
and the front wall of the trailer is 52 mm (2.00 in.).
• If the bulkhead covers the grille on the return air inlet, the grille should be removed to
minimize air restrictions.
• The side edges of the bulkhead must extend a minimum of 25 mm (1.00 in.) past the
sides of the evaporator.
• The minimum air gap between the side edges of the bulkhead and side walls of the
trailer is 25 mm (1.00 in.).
Eng
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