DC Load Test Maintenance Process for Reefer Containers on the CN–Sea Corridor (R14)

1. Scope and unit class

This guide covers the DC load test step within the Periodic Technical Inspection (PTI/PTV) workflow for refrigerated containers (reefers) of class R14 (plug-in) prior to gate-in at Chinese origin ports (CN) and onward transit across the sea corridor. It is a maintenance-process document, not a certification or warranty statement.

The DC load test verifies the DC bus behaviour of the reefer unit under a controlled resistive load, between scheduled PTI intervals. R14 is the ISO container designation for containers with a removable refrigeration unit suitable for shore-power plug-in at depots. The three OEM equipment families covered are:

• Carrier ThinLine 69NT40 — Carrier Transicold ThinLine reefer unit family (69NT series), per the Carrier ThinLine 69NT40 service manual (R14 plug-in configuration; manual revision confirmed at RFQ).
• Thermo King SuperFreezer SuperSea — Thermo King SuperFreezer SuperSea service bulletin (bulletin number + revision confirmed at RFQ; Thermo King dealer portal is JS-walled).
• Daikin ZESTIA Z160DC — Daikin ZESTIA Z160DC service manual (revision confirmed at RFQ; Daikin service portal is JS-walled).

2. Step sequence (single owner per step)

Each row has one named owner. Steps 2–7 are on the reefer technician; the QA officer only signs the aggregated record at step 8. Exact torque values, SOC windows and DC bus voltages for steps 4–6 are NOT asserted here because they are OEM-specific — see the named manuals above (revisions to confirm at RFQ).

3. Document checklist (literal filenames)

Drop these exact filenames into the unit folder before gate-in. Filenames are literal — do not rename.

• 01_unit_identity_R14.csv — unit number, R-class, last PTI date.
• 02_LOTO_log_entry.pdf — lock-out / tag-out record from step 2.
• 03_visual_inspection_row.pdf — inspection row of the PTI sheet.
• 04_load_bank_connection_record.pdf — calibrated DC load bank connection record.
• 05_dc_load_test_readings.csv — voltage, current, temperature at start and end.
• 06_pass_fail_annotation.pdf — annotated pass/fail versus OEM thresholds.
• 07_close_out_entry.pdf — re-secure and de-isolate record.
• 08_signed_PTI_PTV_record.pdf — final signed PTI/PTV document.
• 09_gate_in_release_note.pdf — release note attached to the booking.
• 10_oem_service_manual_reference.pdf — copy of the OEM section used (Carrier ThinLine 69NT40 / Thermo King SuperFreezer SuperSea / Daikin ZESTIA Z160DC — whichever applies; revisions to confirm at RFQ).

4. Timeline (indicative)

Windows are indicative and depend on depot workload, vessel cut-offs and OEM interval tables. Source: operator planning convention; no single hard cut-off is sourced here.

5. Indicative cost slots

Hard pricing is not published in this guide. Slots below are indicative placeholders only — replace with sourced quotes before any commercial use. No public OEM, depot or regulator figure is cited here; all figures are PENDING.

All figures are PENDING. Populate from a named OEM datasheet, depot tariff or regulator page before publication. No deep vendor URL is asserted for OEM part prices.

6. HS code and duty block (rates marked PENDING)

Disclaimer: HS classification and applicable duty / VAT rates depend on the exact goods description, origin and the customs administration processing the entry. Always confirm with a licensed customs broker and the relevant national tariff. Rates here are intentionally marked PENDING. References: EU TARIC (link), USITC HTS (link), UK Global Tariff (link), Japan Customs (link), Australia ABF current tariff (link), SARS customs & excise tariff (link), Ghana Revenue Authority (link), Uganda Revenue Authority (link), ICC Incoterms® 2020 (link).

7. Frequently asked questions

7.1 What is the DC load test for?

It is a controlled load applied to the unit’s DC bus during a Periodic Technical Inspection, used to confirm the bus behaves within the OEM pass band between scheduled PTI intervals.

7.2 Is the DC load test a certification step?

No. It is a maintenance-process step inside the broader PTI/PTV workflow. The CTU Code (IMO/ILO/UNECE, 2014) maintenance provisions and the applicable OEM service manual define the procedure.

7.3 Where does this fit in the CN–sea corridor flow?

It sits between depot arrival and gate-in at the Chinese origin terminal, after the unit is queued for export and before it is released to the booking.

7.4 Who signs the record?

The reefer technician executes the test; the QA officer signs the aggregated PTI/PTV record at step 8.

7.5 What documents must be filed?

The ten files listed in section 3 (literal filenames), archived in the unit folder and attached to the booking in the TMS.

8. Call to action & source index

Need this workflow applied to a specific reefer unit or corridor? Send the unit number, R-class, OEM family (Carrier ThinLine 69NT40 / Thermo King SuperFreezer SuperSea / Daikin ZESTIA Z160DC) and the latest PTI date.

Request a quote (RFQ) — CN–Sea reefer DC load test support

Source index (issuer — document — URL)

This page is a maintenance / process guide. It does not replace OEM service instructions, the CTU Code, or local customs rules. No certification, warranty or commercial guarantee is implied. All rates and prices are PENDING unless a named source is added. Reviewed by muse-ba. Evidence pack reference date: 2026-09-22.