Installation manual

46
DE Split-Evaporator Installation
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.
Bulkhead Function
A bulkhead is used to keep the return airflow from being restricted if the
load shifts. The bulkhead also prevents the load from shifting into the
return airflow passageway on the front wall of the trailer.
DE Split-Evaporator Installations
All center-partition (longitudinally split trailer) installations are unique due
to the splitting of the air supply outlets and air supply returns.
The following details are critical
to this installation:
• A special bulkhead must be installed and sealed properly to “split” the
air supply returns for each compartment.
• The center wall partition must be modified and sealed properly to
“split” the air supply outlets for each compartment.
• Air gaps must be properly sealed with foam insulation or caulking.
Bulkhead (Detail I)
1. A special bulkhead must be installed that allows the return air to be
routed back to each roadside and curbside evaporator.
2. From the center line (C/L) of the unit measure 11.5 in. (292 mm) to
locate the unit’s internal center divider.
3. The bulkhead must have a divider channel that runs from the unit’s
internal center divider down to the trailer floor. This diagonal partition
divider must be insulated with the 2.00 in. (50.8 mm) thick foam
insulation supplied in the installation kit.
4. Insulate the entire triangular area, inside the bulkhead, where the air
return crosses over into the opposite compartment with the 1.00 in.
(25.5 mm) thick foam insulation supplied in the installation kit.
5. All air gaps between the top edge of the bulkhead and the evaporator
panel must be sealed completely with foam insulation or caulking.
6. The bulkhead must be equipped with a lower air inlet screen to prevent
debris from entering into the air inlet openings.
Center Wall Partition (Detail II)
7. A small section of the center partition must be modified to route the air
supply from the roadside evaporator to the roadside compartment.
CAUTION: Do not drill holes into refrigeration, electrical or
mechanical components or severe damage to the equipment will
result!