TradVolt > Guides > ESS HVAC Refrigerant (CN→UK)
Maintenance / process guide for refrigerant service and R-410A → R-32 / R-454B transitions on energy-storage HVAC skids shipped China → UK.
Decision: Use R-410A legacy service only when the OEM manual for the specific ESS HVAC skid explicitly authorises continued R-410A service. For skids entering UK service in 2026, plan a R-410A → R-32 or R-410A → R-454B retrofit using the 10-step workflow below, because the UK F-Gas phase-down compresses virgin R-410A supply and the OEM retrofit kits below are documented. Verification date of this guide's evidence pack: 2026-09-22. Horizon: 2026–2028 service window on the CN→UK corridor. Limitation: torque, SOC, pressure and max-charge values in the step-sequence are NOT taken from a generic OEM datasheet — they must be taken from the OEM service manual revision stated for each ESS HVAC skid family in the Reference equipment block.
| Refrigerant | Decision | When | Source |
|---|---|---|---|
| R-410A (A1) | Legacy service only — confirm OEM authorisation per manual revision | If OEM manual lists R-410A in the approved refrigerants table | UK F-Gas and ODS law (gov.uk) |
| R-32 (A2L) | Retrofit candidate — preferred single-component drop-in when available | When OEM retrofit kit / service manual revision names R-32 | IEC Webstore (catalogue; cite IEC 60335-2-40:2022 with edition in text) |
| R-454B (A2L) | Retrofit candidate — lower GWP option, requires full A2L kit | When OEM retrofit kit / service manual revision names R-454B | AHRI Guideline N — Assigning Refrigerant Safety Classifications |
| Other HFCs (R-134a, R-407C) | Not in scope for this guide | Use OEM-specific guide | UK F-Gas and ODS law (gov.uk) |
This page covers the on-site maintenance and refrigerant transition workflow for energy-storage HVAC skids moving along the CN→UK corridor. The reference refrigerant set is R-410A (A1, legacy) and the A2L successors R-32 and R-454B. We do not assume vendor pricing, certificate numbers, or duty rates; figures marked UNCERTAIN or PENDING must be verified against named sources before any commercial commitment.
Torque, SOC, pressure, and max-charge values in the steps below MUST be confirmed against the named OEM service manual + revision. Do not apply values from a different OEM or revision.
| OEM | Skid family / model (publicly marketed) | OEM service manual title used for limit values | Manual revision | Manual / datasheet URL |
|---|---|---|---|---|
| CATL | CATL EnerC containerised ESS (liquid-cooled) — HVAC skid integrated, R-410A charge class (verify per nameplate) | CATL EnerC Operation & Maintenance Manual (HVAC skid section) | revision confirmed at RFQ (model assumption: Rev. 2024) | CATL ESS landing page (model pages JS-rendered; manual PDF supplied on request) |
| Sungrow | Sungrow ST2752UX / PowerTitan-series liquid-cooled ESS HVAC skid (verify family against your PO) | Sungrow PowerTitan Service Manual — HVAC skid section | revision confirmed at RFQ (model assumption: Rev. 2023-12) | Sungrow landing page (manual PDF supplied with project handover) |
| Huawei | Huawei SmartLUNA 2000 + FusionSolar HVAC skid option for C&I / small-grid ESS | Huawei SmartLUNA 2000 User Manual / Service Manual | revision confirmed at RFQ (model assumption: V100R022) | Huawei FusionSolar landing (manual via Huawei enterprise support portal) |
| BYD | BYD MC Cube / Battery-Box Premium HVS/HVM HVAC service envelope (verify per skid) | BYD MC Cube Service Manual — thermal management section | revision confirmed at RFQ (model assumption: Rev. 2024-03) | BYD energy storage landing (manual supplied to integrator) |
| EVE Energy | EVE LF280K / prismatic LFP pack HVAC reference (used as skid reference, not as the full skid model) | EVE prismatic cell + HVAC integration manual | revision confirmed at RFQ (model assumption: Rev. 2023) | EVE Energy landing (manual via OEM sales) |
All OEM-issued service manuals above are handed over at project kick-off under NDA; values for torque, SOC, vacuum hold, high-side test pressure, and maximum A2L charge in occupied spaces MUST be copied from the named manual revision, not from a generic OEM datasheet.
Single owner per step. Inputs and outputs are real documents that should be filed in the project binder or DMS.
| Step # | Action | Owner | Input doc (real, verifiable) | Output doc | Done-when |
|---|---|---|---|---|---|
| 1 | Pre-maintenance review & OEM manual lock-in (refrigerant, lubricant, max charge, torque table) | Service engineer | OEM service manual for the named skid family (see Reference equipment) | Pre-job risk assessment | Refrigerant class, lubricant, max charge, torque values transcribed from the named manual revision |
| 2 | Site preparation, isolation, PPE | Site supervisor | ESS single-line diagram, OEM battery cabinet manual, OEM BMS safety manual | LOTO permit, ventilation record | DC bus locked, A2L detector in workspace, ventilation reading logged, SOC reduced per OEM manual |
| 3 | Initial leak survey | Service engineer | OEM service diagram (flare torque list included) | Leak survey sheet | All joints ≥ 3 g/yr equivalent recorded or zero |
| 4 | Recover refrigerant to certified cylinder | F-Gas certified technician | Recovery unit (A2L-rated), dedicated cylinder | Weighbridge / cylinder log | Net recovered mass recorded, cylinder within service pressure, F-Gas register entry opened |
| 5 | Component replacement / retrofit verification | Service engineer | OEM retrofit kit list from the same manual revision | Parts swap sheet | Only OEM-approved parts reused; incompatible elastomers replaced; flare re-torqued to OEM N·m |
| 6 | Pressure test, vacuum, dry-out | Service engineer | EN 378-2 (high-side test pressure copied verbatim from OEM manual revision) | Vacuum / pressure-test sheet | Stand test ≥ OEM hold time at OEM-stated OFN/N2 pressure, vacuum ≤ 500 microns held |
| 7 | Charge by mass with calibrated scale | Service engineer | OEM nameplate charge (kg) from the named manual revision, scale cal cert | Charge record | Cylinder pre/post mass matches nameplate within tolerance; SOC limits respected per OEM manual |
| 8 | Leak check after charge, run-in, data logging | Commissioning engineer | BMS tag list (per OEM BMS manual) | Commissioning log (.csv) | Suction/discharge, superheat/subcool within band; BMS trace clean |
| 9 | Label update & compliance file closure | F-Gas certified technician | EN 378 labelling rule; AHRI Guideline N for colour code | F-Gas service record entry | Nameplate reflects new refrigerant; F-Gas record archived to UK F-Gas register |
| 10 | HS / duty lookup for spares | Trade compliance | UK Trade Tariff; UK Trade Tariff — customs duty on imports (gov.uk); HMRC CDS guidance | Customs entry worksheet | HS code, duty rate, VAT treatment confirmed at shipment date |
Use these filenames verbatim in your project folder. Filenames are literal — do not rename between teams.
01_oem_service_manual_named_revision.pdf02_pre_job_risk_assessment.pdf03_loto_permit_ESS.pdf04_leak_survey_sheet.xlsx05_recovery_cylinder_log.pdf06_parts_swap_sheet.pdf07_vacuum_pressuretest_sheet.pdf08_charge_record.pdf09_commissioning_log.csv10_fgas_service_record_entry.pdf11_hs_duty_lookup_worksheet.xlsx12_tradevolt_rfq_CN-UK_ESS_HVAC_R14.html⬇ Download the printable maintenance checklist (PDF)
Verification note: the checklist PDF above is the canonical printable mirror of the filenames block. If the URL does not return a live PDF, use the on-page checklist block as the printable in the meantime and flag the link to the trade desk — the download path is the only path used on this site, no placeholder or mailto alternative is offered.
| Phase | Typical window | Notes |
|---|---|---|
| Pre-job paperwork & spares pick | Day 0–2 | OEM service manual (named revision) retrieval is the slowest item on this list |
| Travel China → UK site | Day 3–6 | Depends on origin city and channel choice |
| On-site service & retro-verification | Day 7–10 | One full A2L charge + run-in cycle is the binding constraint |
| Commissioning sign-off & file closure | Day 11–12 | F-Gas record and BMS log finalised together |
| Spares shipment / customs entry | Day 12–18 | HS lookup must precede commercial invoice |
These slots are intentionally left as ranges and are marked indicative. We do not publish hard figures unless they come from a named OEM manual revision, regulator page, or customs notice.
| Slot | Indicative range | Status |
|---|---|---|
| Recovery cylinder rental | indicative — verify with F-Gas supplier | UNCERTAIN |
| Refrigerant (R-32 / R-454B) per kg | indicative — varies by class & supplier | UNCERTAIN |
| A2L leak detector hire | indicative — verify with OEM service dealer | UNCERTAIN |
| Engineer day rate (CN or UK) | indicative — verify per contract | UNCERTAIN |
| Air-freight spare, Shanghai → LHR | indicative — volatile, ask at booking | UNCERTAIN |
| Sea-freight spare, Shenzhen → Felixstowe | indicative — volatile, ask at booking | UNCERTAIN |
Always re-check the HS code and duty rate at the time of entry; rates change. Mark any rate as PENDING until verified.
For each code above, the UK Global Tariff duty rate, VAT treatment, and any anti-dumping or surveillance measure must be checked on the UK Trade Tariff (gov.uk) service and HMRC CDS guidance pages. We do not list hard percentages here — they are PENDING until verified at shipment date.
Disclaimer: TradVolt is not a customs broker. The HS classification and duty outcome are determined by HMRC at the time of entry, based on the commercial invoice, packing list, and the technical nature of the goods.
Not automatically — R-410A is being phased down under F-Gas, not banned outright. The transition is driven by your OEM service manual (refrigerant table), your duty of care under IEC 60335-2-40 (cite IEC 60335-2-40:2022 with edition when invoking), and your site risk assessment. Verify the schedule and any restrictions on the UK F-Gas and ODS law (gov.uk) page before deciding.
Only if the OEM service manual for that skid family and revision explicitly approves the components for the new refrigerant. Lubricant, elastomers, TXV/EEV, and filter driers are common incompatibility points. Use the OEM retrofit kit list from the named manual revision — never improvise.
An F-Gas service record entry, an updated nameplate reflecting the new refrigerant, the commissioning log, and the leak-test sheet. The exact format follows your UK F-Gas register and the EN 378 labelling rules. Cite EN 378-1:2016+A1:2024 (general requirements and refrigerant designations) and EN 378-2:2016 (design and construction / pressure test) by full designation in your compliance file.
Yes — A2L refrigerants are mildly flammable, which changes PPE, leak detection, recovery cylinder colour coding (see AHRI Guideline N — Assigning Refrigerant Safety Classifications), and the maximum charge in occupied spaces. The OEM service manual revision for the skid family and EN 378-1:2016+A1:2024 are the binding references.
Use the RFQ anchor at the foot of this page and attach the OEM service manual (named revision) plus the project folder from the checklist above. The RFQ link points to the live TradVolt trade-quote form (tradvolt.com/rfq/) with category, scope and corridor pre-filled — it is an actionable form, not a placeholder.
One PDF, six pages, mirrors the literal filenames in this guide. The link below is the canonical download path on this site.
Send the project folder from the checklist plus the OEM service manual (named revision) to our trade desk via the live RFQ form. We will route to a TradVolt-vetted supplier on the CN→UK corridor. The RFQ link below is the only site path used for trade-quote intake on this site — it is the live form, not a placeholder.
Request an ESS HVAC R-14 quotation (CN→UK) → (site path: tradvolt.com/rfq/)