Engineering Reference Case Profile · Rail & Vehicle HVAC
Rail and Vehicle HVAC · Wide-Temperature EC Fans, High Static Pressure in a Small Frame
Compiled from LONGWELL’s real correspondence with rolling-stock HVAC builders, bus and special-vehicle climate system manufacturers. This segment is defined by three constraints that rarely appear together elsewhere: a wide ambient range down to −40 °C, static pressure above 1,000 Pa out of a frame under 200 mm, and a DC bus voltage that is not 24 V.
About this case profile: This profile is compiled from real LONGWELL project correspondence in this segment. Customer names, commercial terms and pricing are withheld; company names and branding have been removed from the photographs. Model numbers, electrical ratings and dimensions are quoted from LONGWELL controlled datasheets, product nameplates and customer-approved drawings. Where a figure is a typical range rather than a measured project result it is labelled as such. Named references are available under NDA on project qualification (sales@longwellfans.com).
1 · Challenge
- Ambient range is the first filter. Rolling-stock and vehicle HVAC specifications routinely call for −25 °C to +60 °C operation, and cross-reference targets in this segment go down to −40 °C start-up.
- Static pressure against frame size: one specification required 1,009 Pa from a 190 × 190 × 101.8 mm frame at 4,100 rpm. Airflow-only selection is meaningless here; the duty point is what matters.
- The DC bus is a vehicle bus, not a control bus. Cross-reference targets ran at 110 V DC (60–143 V range) and 80 V DC (50–100 V) — wide-input electronics, not a standard 24 V or 48 V board.
- Ingress protection is specified per position: IP44 for protected axial positions, IP54 and IP55 for centrifugal fans in exposed roof-mounted units.
- Most enquiries in this segment arrive as a competitor cross-reference — an ebm-papst datasheet and a demand for a 1:1 match on duty point, mounting interface and control protocol, often in initial quantities of five units for maintenance replacement.
- Communications are part of the specification: Modbus RS-485 with a floating status relay, alongside 0–10 V or PWM, and speed feedback for the vehicle controller.
- Roof-mounted and underfloor equipment sees continuous vibration and long thermal cycling, so bearing, potting and surface-finish decisions carry more weight than in stationary HVAC.
2 · Solution architecture
Selection in this segment starts from the duty point and the bus voltage, not the frame size. The LWBE3G backward-curved EC range covers the high-static-pressure positions with PA6+GF or steel impellers; the LWAD DC axial range covers the low-pressure, low-voltage positions; and wide-input DC electronics are evaluated case by case against the vehicle bus. Every aerodynamic figure quoted into this segment is tested per AMCA 210/211 methods, because the customer’s own duct resistance calculation depends on it.
Models supplied and cross-referenced in this segment
| Model | Frame / dimensions | Electrical | Environment | Position |
|---|---|---|---|---|
| LWBE3G190-072NS-06 | 190 × 190 × 101.8 mm | 1 ph 220 V 50 Hz / 230 V, 170 W, 1.3 A, 4,100 rpm, 973 m³/h, 1,009 Pa, 72 dBA | IP55, −25 to +60 °C, PA6+GF impeller | High static pressure in a compact position |
| LWBE3G310-138NT-05 | 319 × 319 × 238 mm; inlet ring 348 × 348 × 60.5 mm | 3 ph 400 VAC 50/60 Hz, 980 W, 1.64 A, 2,600 rpm, CL.F | IP54, −25 to +60 °C | Main supply fan, roof-mounted HVAC unit |
| LWBE3G225-092NS-02 → LWBE3G225-072NS-07 | 125 × 125 × 159.3 mm class | 1 ph 230 V 50 Hz, 150 W | IP44, −25 to +60 °C | Upgraded selection — better head and system efficiency at the same envelope |
| LWAD250S-7PB-02 | Ø250 mm axial | 48 V DC, aluminium impeller | IP44 | Condenser and low-pressure ventilation positions |
| LWBE3G / LWAE3G wide-input DC | Various | 110 V DC (60–143 V) and 80 V DC (50–100 V) evaluated | IP44 / IP54 / IP55 | Cross-reference replacements on vehicle DC bus |
| LWCD 24 V DC cross-flow (single / double / triple) | Ø60–Ø65 mm, up to 1,100 mm barrels | 24 V, e.g. 1.80 A, 1,800 rpm, 920 m³/h, 65 Pa, 53 dB(A) | — | Bus, refrigerated-vehicle and cab air distribution |
3 · Verified figures
Fan performance figures are quoted from LONGWELL controlled datasheets and product nameplates and are tested per AMCA 210/211 methods; third-party reports available on request. EC versus AC energy saving is approximately 30%, higher under strongly varying load — confirm against your own load profile. Final selection must be confirmed against the actual duty point (airflow, static pressure, ambient temperature, certification scope) of your machine.
Static pressure in a 190 mm frame
1,009 Pa
LWBE3G190-072NS-06 at 4,100 rpm, 973 m³/h, 170 W
Qualified ambient range
−25 to +60 °C
Standard for this segment; cross-reference targets reach −40 °C start-up
Roof unit main fan
980 W · 2,600 rpm
LWBE3G310-138NT-05, 3 ph 400 VAC 50/60 Hz, 1.64 A, CL.F, IP54
Ingress protection supplied
IP44 / IP54 / IP55
Specified per position, not per product family
Vehicle DC bus handled
110 V DC (60–143 V)
Plus 80 V DC (50–100 V) on cross-reference work
Impeller material
PA6+GF / SPCC
Glass-filled polyamide for backward-curved wheels; steel for axial
Communications
Modbus RS-485
With floating status relay and speed feedback, alongside 0–10 V / PWM
Typical first order
5 units per model
Maintenance replacement volumes — response speed decides the account
4 · How these programmes run
Cross-reference receivedCustomer sends the incumbent datasheet. First check is bus voltage and range, then the duty point — not the frame size.
Duty point matchingAirflow, static pressure and speed are matched against the LWBE3G / LWAE3G range and a comparison table is issued. Figures are tested per AMCA 210/211 methods so the customer can run their own duct resistance check.
Environmental confirmationAmbient range, IP class and impeller material are confirmed per position. This is where wide-temperature requirements either fit the existing platform or trigger an electronics evaluation.
Control protocolModbus RS-485, floating status relay, speed feedback and 0–10 V / PWM are settled and marked on the drawing with lead definitions.
Sample batchTypically five units per model for maintenance replacement, or a single sample for a new platform. Fast turnaround on this step is what converts the account.
Series supplyNameplates carry model, electrical rating, IP class, insulation class and build date for traceability; PCB potting and surface finish are fixed for the vibration and thermal-cycling duty.
5 · Engineering lessons carried forward
- Ask for the bus voltage first. A 110 V DC vehicle bus with a 60–143 V range is a different electronics problem from a 24 V or 48 V board. Establishing this before selection avoids quoting a product that can never be fitted.
- In this segment the duty point is the specification. A 190 mm frame delivering 1,009 Pa is only meaningful with the airflow, speed and power alongside it — free-delivery airflow figures are not a basis for selection.
- Confirm the test standard and IP class at the first technical exchange. Stating that aerodynamic figures are tested per AMCA 210/211 methods, and fixing IP44 / IP54 / IP55 per position, measurably shortens the technical approval cycle.
- Propose the upgrade when the envelope allows it. Replacing a specified LWBE3G225-092NS-02 with the LWBE3G225-072NS-07 gave better head and system efficiency at the same mounting envelope — worth raising rather than quoting the original part by default.
- Small first orders are the entry point, not the business. Five units per model for maintenance replacement is normal here; responsiveness and a complete performance comparison table are what convert them into platform supply.
- Nameplate traceability is not paperwork. Model, rating, IP class, insulation class and build date on the plate is what allows a fielded unit to be identified years later, in a segment where the vehicle outlives several maintenance cycles.
6 · Project evidence
Every item below is a real project thread from LONGWELL’s own correspondence. Each carries an anonymised case reference, the counterparty described by industry and buying role only, an evidence grade, the actual dates from first contact to close, the length of the email thread and, where an invoice is on file, the order value band. Customer names, domains, prices and commercial terms are withheld — including from the photographs. Evidence grade A means controlled documents or test reports are on file for that thread; grade B means a structured enquiry and specification are on file. Order value bands are read from the proforma or commercial invoice held on file for that thread and are rounded to a band; the invoice currency is shown as invoiced. A band is only given where the invoice currency is unambiguous — 20 of the threads on these pages carry one. Unit prices are never published.
High static pressure EC centrifugal plus 48 V DC axial, one vehicle platform
- LWBE3G190-072NS-06: 190 × 190 × 101.8 mm, 1 ph 220 V 50 Hz / 230 V, 170 W, 1.3 A, 973 m³/h at 1,009 Pa, 4,100 rpm, 72 dBA, PA6+GF impeller, IP55, −25 to +60 °C.
- Paired with LWAD250S-7PB-02 48 V DC axial with aluminium impeller at IP44 for the lower-pressure positions, and LWBE3G225-092NS-11.
- All aerodynamic figures issued as tested per AMCA 210/211 methods so the customer could run their own duct resistance calculation.
Roof-mounted HVAC main fan, 3-phase 400 V EC
- LWBE3G310-138NT-05 with integrated inlet ring: fan 319 × 319 × 238 mm, inlet ring 348 × 348 × 60.5 mm, 980 W, 3 ph 400 VAC 50/60 Hz, IP54, −25 to +60 °C.
- Engineering proposed replacing the specified LWBE3G225-092NS-02 with LWBE3G225-072NS-07 — better head and system efficiency inside the same mounting envelope. The nameplate photograph below is from this platform.
ebm-papst cross-reference on a 110 V DC vehicle bus
- Target: R3G310-AN13-11 — 110 V DC (87–143 V), 2,500 rpm, 345 W, 3.2 A, 2,785 m³/h at 0 Pa, IP42, ambient −40 to +50 °C, 5 kg, 310 mm frame; plus an AC forward-curved scroll fan requiring identical mounting holes and dimensions.
- A 1:1 parameter comparison was issued against the LWBE3G range with matched flange dimensions and performance curves. Initial quantity five units per model.
Wide-input DC and RS-485 cross-reference programme
- Targets included D1G133-DC55-16 (110 V DC, 60–143 V, 120 W, 1,100 m³/h at 560 Pa, IP44), R3G190-RY87-P2 (80 V DC, 245 W, 4,800 rpm, IP54), R3G250-RR09-P1 (110 V DC, 540 W, 500 m³/h at 1,500 Pa, 3,800 rpm) and R3G280-RR10-P1.
- Requirements included static pressure up to 2,000 Pa, Modbus RS-485 with a floating status relay, and IP44 / IP54 / IP55 by position. Evaluation covered both tooling match and control-board development against the LWBE3G and LWAE3G platforms.
Surface finish change after a transit review
- Following a transit-damage review the impeller surface treatment was changed, and the mill-finish backward-curved wheel below was supplied for the customer’s approval before series build.
DC cross-flow for bus, refrigerated vehicle and air-curtain positions
- LWCD-65820M-20 (24 V, 1.80 A, 1,800 rpm, 65 Pa, 920 m³/h, 53 dB(A), Ø65 mm), LWCD-651100M-30 (24 V, 4.20 A, 1,600 rpm, 55 Pa, 1,225 m³/h, 56 dB(A)) and LWCD-60870M-20 (24 V, 1.0 A, 1,800 rpm, 52 Pa, 550 m³/h, 49 dB(A)).
- Single, double and triple refer to the number of impeller sections coupled inside one housing — clarified in writing, because the internal and external model coding for these variants is a recurring source of confusion.
Fan performance figures are quoted from LONGWELL controlled datasheets and product nameplates and are tested per AMCA 210/211 methods; third-party reports available on request. EC versus AC energy saving is approximately 30%, higher under strongly varying load — confirm against your own load profile. Final selection must be confirmed against the actual duty point (airflow, static pressure, ambient temperature, certification scope) of your machine.
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