Replace the duty label with the cargo’s actual temperature requirement
“Chilled” and “frozen” leave important design inputs unstated. Specify the cargo-approved range, ambient conditions, loading temperature and door pattern. A truck selected for chilled duty should not simply be assumed suitable for frozen duty.
A lower setpoint increases the temperature difference across the body and can change cooling capacity, defrost behavior and energy demand. Door infiltration becomes more consequential, while frost can affect airflow and drainage. The body and unit need to be reviewed for the intended conditions.
Compare the body load and operating procedure for each duty
If the fleet changes cargoes between trips, identify the validated configuration, cleaning, monitoring and procedure for each use. Warm-product pull-down is a separate design requirement; a broad temperature label does not include it automatically.
Scroll horizontally to view all columns.
| Decision | What to establish | Condition or limit |
|---|---|---|
| Setpoint | Use the cargo-approved transport range. | Labels such as chilled or frozen are not precise specifications. |
| Body load | Model larger temperature difference and infiltration as applicable. | The same body can have different loads by duty. |
| Defrost and frost | Review evaporator, drainage and operating cycle. | Ice can restrict airflow and performance. |
| Operations | Define pre-cooling, loading, doors, monitoring and excursions. | Equipment cannot compensate for an uncontrolled process. |
Agree the conditions before switching duty
Give the supplier the product range, pre-cooling plan, loading pattern and expected door use. Request the applicable thermal selection and monitoring evidence. Obtain the cargo owner’s and destination-specific requirements before approving a change of duty.
Information to prepare for this review
- Cargo-specific transport range
- Frozen or chilled starting product condition
- Worst-case ambient and route time
- Door-opening and loading pattern
- Body insulation, floor and sealing requirements
- Defrost, monitoring and contingency requirements
Records to request and keep
- Cargo-owner temperature specification
- Duty-specific refrigeration selection
- Body insulation and sealing specification
- Commissioning and temperature-monitoring plan
Common mistakes and what to check instead
- Buying a frozen label without a design condition: State setpoint, ambient, route, body and door assumptions.
- Expecting the truck to freeze warm cargo: Define and size any pull-down duty separately.
- Ignoring defrost and drainage: Include frost management and service access in the specification.
Scope of this guide
Cargo and food-safety requirements are product and jurisdiction specific.
Final equipment selection requires a project calculation.
Do not switch duty without approved configuration, procedure and monitoring evidence.
Sources and applicability
Controls the project-input, quotation, approval and inspection workflow described in this guide.
Provides public checklists and worksheets; the signed project documents remain controlling.
Defines the relevant product family and published configuration boundaries. Project-specific ratings require the selected OEM documents.
Primary public guidance supporting preconditioning, airflow, door-seal and loading checks. Cargo-owner and destination requirements remain controlling.