An open door and running unit do not have the same effect in every loading setup. The MEB refrigerated-vehicle module warns about a defined practice.
Risks in the module
Forced-air cooling in an open, uninsulated space can waste fuel and energy.
The evaporator fan can expel air and affect body temperature.
Warm, humid air entering to replace expelled cold air can cause condensation and icing on the coil.
The module says its described conditions can also cause unit failure. This is not an automatic rule for every loading scenario.
Fan and open door
With the door open, the fan can increase air exchange. Assess the effect using door position, loading method and actual readings.
Those three points describe where warehouse to store distribution breaks most often.
Watch for icing
Coil icing can affect airflow and heat transfer; check against trip records.
Set the procedure
The MEB module recommends loading promptly with the unit off after pre-cooling. Check the vehicle instruction and site procedure scope.
| Observation | Check |
|---|---|
| Door open, unit running | Vehicle and procedure instructions |
| Loading with unit off | Product condition and route record |
| Icing observed | Unit inspection |
Document product deviations and refer disposition to an authorised person.
