Operating instructions

Dole – Drivers Reference Manual
Page 40
 Check set point to ensure temperature setting is correct for the product you are
transporting. Banana transport generally requires a constant supply air of 57 degrees
during summer months and 58 degrees during colder periods of the year.
 Check return and supply air at the controller.
 Check for any loose wire connections and/or refrigerant leaks.
 Report any equipment problems to the M&R department. A technician will assist you
if your unit requires any repairs or if you have any questions about the operation of
your unit.
4.3.2 Monitoring Equipment Operation
During the transport of your refrigerated load, periodically check the operation of the reefer
unit to ensure the product is being maintained at the proper temperature. If an equipment
failure occurs, take action to effect repairs following the guidelines provided in section 5.
4.3.3 Proper Refrigerant
While the majority of refrigeration systems in the Dole fleet use R-134a for refrigerant, some
units are designed to operate on R-404A. The type of refrigerant used in your particular unit
will be clearly marked. In the event repairs are required to the refrigeration system of your
unit or the unit is low on refrigerant, it is essential that the proper refrigerant be used.
4.3.4 Cold Weather Delivery
When delivering a banana load to a customer location where ambient temperatures are below
freezing, keep the rear doors closed at all times except when unloading. Ensure the
refrigeration unit is shut off during unloading to prevent cold ambient air from being pulled
into the container and damaging the fruit load.
4.3.5 Backhaul of Frozen Loads
If you are backhauling a frozen load after having made customer delivery of a banana load,
the reefer unit should be pre-tripped and the defrost interval changed from 24 hours to 6
hours prior to loading. If the defrost interval is not reduced to six hours intervals the
evaporator coil will ice up and prevent the unit from cooling properly. NOTE: On Thermo
King units, the defrost interval is adjusted automatically as set point changes are made.
Unless otherwise directed, the fresh air make up vents located on the front of the unit should
be in the closed position when transporting frozen loads.
4.4 Operating Instructions for Dole Temperature Controllers
As indicated earlier, Dole refrigeration units are manufactured by Carrier and Thermo King.
This section explains proper operating procedures for the various models of refrigeration
controllers used in these units. The container specification guide found in section 4.2 will
help you determine which controller your particular container is equipped with.