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Spiral Freezer Factory Acceptance Test Checklist
The checks run on a spiral belt freezer before it is packed, written so that your own engineer or an inspection agent can run them independently. Every row is either witnessed or recorded; a row that cannot be witnessed in the workshop is marked for the site acceptance instead.
The principle behind the sheet. A freezer is bought on paper and judged on a running line. The way to close that gap is to fix the acceptance criteria before the machine is built, using the same figures that went into the sizing, so nobody is negotiating criteria after the crate is open.
1. Documentation and configuration
| Pass | Check | What good looks like |
|---|---|---|
| ☐ | As-built matches the approved configuration | Every deviation from the approved drawing is written down and signed, not explained verbally |
| ☐ | Sizing inputs recorded next to the outputs | Piece thickness, entry temperature, target core and rate appear on the record, so the machine can be judged against them later |
| ☐ | Electrical schematics and terminal list match the cabinet | Terminal numbering on the drawing is the numbering in the cabinet |
| ☐ | Operation and maintenance manual present | Includes the belt tension procedure and the defrost sequence, not only a parts list |
| ☐ | Packing list and export documents prepared | Customs classification and case marking agreed before the machine is crated |
2. Mechanical run
| Pass | Check | What good looks like |
|---|---|---|
| ☐ | Belt tracks through the full helix without edge contact | Run the belt for a sustained period, not a few revolutions; tracking faults appear over time |
| ☐ | Drive bar and belt edge engagement inspected around the cage | Even engagement with no riding up and no visible edge wear after the run |
| ☐ | Belt tension and take-up travel within the working range | Take-up sits with movement available in both directions, not at the end of its stroke |
| ☐ | Transfer points at infeed and outfeed run clean | No snagging and no step that would tip or damage product |
| ☐ | Guarding, walkways and access panels fitted and secure | Access to the cleaning zones is possible without dismantling structure |
| ☐ | Contact surfaces inspected for weld finish and crevices | Smooth and drainable where the product travels, with no gap that would hold product |
| ☐ | Lubricant specified for the running temperature, and the grade written into the manual | A general purpose mineral grease stiffens toward a wax at freezing-zone temperature, and mixing incompatible greases is as damaging as using the wrong one. This belongs on the acceptance sheet, not buried in the maintenance manual |
3. Control system
| Pass | Check | What good looks like |
|---|---|---|
| ☐ | Belt speed adjustable across the full specified range | The dwell time you were quoted is reachable at both ends, with margin left at the fast end |
| ☐ | Infeed and belt drives coordinate correctly | Changing one does not lose synchronisation with the other |
| ☐ | Defrost sequence steps through on the panel | Each step can be seen and the sequence can be interrupted safely |
| ☐ | Alarms and interlocks trigger and clear | Test them by causing the condition, not by forcing the bit |
| ☐ | Emergency stops tested at every station | Each device stops the drives and requires a deliberate reset |
| ☐ | Panel legends readable in the language agreed for the order | Screen text, labels and manual use the same terminology |
| ☐ | Belt overspeed: how it is defined, how it is measured, how often | There is no universal number to quote, because it moves with the up-going or down-going arrangement and the application. Get the measurement method, the interval and the name of who you call when it drifts, written down |
4. Electrical verification
| Pass | Check | What good looks like |
|---|---|---|
| ☐ | Supply voltage, phases and frequency match the site | Confirmed against the site survey, not against the standard offer |
| ☐ | Drive parameters recorded | A written parameter set travels with the machine so it can be restored after a replacement |
| ☐ | Earthing and bonding verified | Measured and recorded, including the belt and cage structure |
| ☐ | Cable entries and glands sealed | No penetration that lets warm humid air into the cold envelope |
| ☐ | Motor rotation checked in the running direction | Confirmed under power before the belt is loaded |
5. What moves to site acceptance
Thermal performance cannot be proven in a workshop without the refrigeration plant, the product and the room around it. Agree in writing which checks move to site, what product will be run, and how the core temperature will be measured, before the machine ships.
The row that saves the most argument. Write down, at order stage, the exact piece that will be used for the site acceptance run and the instrument that will measure its core. Acceptance disputes are almost never about the freezer; they are about whose piece and whose probe.
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