115V AC Cross Flow Fan for HVAC Units: 340 m³/h Case Study

The requirement

340 m³/h of airflow was the non-negotiable baseline for this specific HVAC modification project. The customer originally procured our standard LWCA-60360SN-06 cross-flow fan, which operates on a 230V supply and delivers 62 Pa of static pressure. They submitted a modification request (Project LW26070802) to adapt this exact performance profile for a 110V/115V grid. This requirement involved an initial pilot run of 40 units for immediate testing. Space constraints were absolute. The original dimensions of 445 mm in total length, with a 363 mm impeller section, could not be altered.

The application demanded continuous S1 operation within an ambient temperature range of -25°C to +60°C. Noise limits remained capped at 48 dB(A). The engineering challenge focused on adapting the AC shaded pole motor to accept the 115V input without increasing heat generation or dropping below the 1700 RPM target speed. Any loss in rotational speed directly compromises the 340 m³/h volumetric flow, causing thermal faults in the equipment. Compliance with safety testing regulations (GB/T13933-2008 as noted on the engineering drawing) governed the final acceptance criteria. The file explicitly notes that the product surface must remain completely clean, without rust spots, mildew, scratches, or obvious burrs. Shell riveting required a tight seal with no obvious gaps, preserving the internal airflow dynamics.

The engineering answer: choosing the 115v ac cross flow

We assigned a technical PM to evaluate the 115V conversion without altering the external 445 mm physical envelope. An entirely new motor topology was initially considered but rejected. Switching to a DC motor with an AC/DC inverter would add unnecessary cost and a potential failure point within the tight chassis. Instead, our team modified the existing AC shaded pole motor. Engineers recalculated the stator windings to accommodate the 115V, 50Hz supply while maintaining the crucial 33W power draw and 1700 RPM shaft speed.

Heat dissipation presents a major hurdle when lowering voltage and increasing current in a fixed volume. To counter this, we specified a high-grade insulation class and retained the precision ball bearings to minimize mechanical friction. The impeller design remained completely unchanged. We used the standard 60 mm diameter aluminum alloy impeller with 30 perfectly balanced blades. This specific configuration, mounted on a 3 mm steel shaft with a 1.5 mm bushing, guarantees the targeted 340 m³/h airflow and 62 Pa static pressure.

Structural integrity relies on SGCC (Galvanized Sheet Steel) for the right side plate, air outlet plate, air inlet plate, and left side plate. These materials ensure rigid mounting across the 312 mm hole centers. By applying our ThermoFlex™ design principles, the modified unit easily sustains operation across the specified -25°C to +60°C temperature gradient. The final engineered model, designated LWCA-60360UN-06-00, achieved all performance metrics during factory tests while meeting the rapid 40-unit pilot delivery schedule.

Final specification

Maintaining the 1700 RPM speed at the modified 115V input directly secures the 340 m³/h airflow requirement. The inclusion of precision ball bearings instead of standard sleeve bearings ensures the motor survives continuous S1 operation at the upper 60°C temperature limit without premature wear.

Every figure above comes from our own test chamber, measured using AMCA 210/211 and ISO 5801 methods. The published procedures behind those numbers are available from AMCA. As always, confirm the duty point against the finished unit before release, since installation conditions move it.

Technical documents

LWCA-60360UN-06-00 Engineering Drawing (PDF)
The official manufacturing drawing outlines the exact 445 mm dimensions, SGCC material requirements, and mounting hole layouts required by integration engineers.

The standard catalog specification sheet provides the baseline P-Q performance curves and electrical data for the original 230V LWCA-60360SN-06 model.

Why it landed here

• 90-Day Custom NPI: European manufacturers typically require 12 to 18 months for a voltage-specific motor modification. Longwell processed this 115V conversion and prepared the 40-unit pilot run in a fraction of that time.
• materially lower Cost Advantage: By adapting our existing AC shaded pole motor tooling rather than forcing a complete redesign, we kept unit costs significantly lower than competitor alternatives while maintaining identical 340 m³/h output.
• Independent Laboratory Verification: Airflow and pressure specifications for this cross-flow fan undergo rigorous validation using AMCA 210/211 and ISO 5801 test chambers.
• Localized Ningbo Supply Chain: Sourcing raw materials like SGCC galvanized steel and aluminum alloy locally protects our production lines from global shipping delays, ensuring the 40 pilot units shipped on schedule.
• Rapid Certification Pathways: Using our local TÜV NORD Notified Body allows accelerated compliance checks for modified electrical components, preventing regulatory bottlenecks.

Explore our full cross flow fans range.

Questions that followed

Q: What is the minimum order quantity (MOQ) for a custom voltage modification like this 115V cross flow fan?

A: For this specific project, we accommodated a 40-unit pilot run to support the customer’s initial testing phase. Standard volume production MOQs depend on the exact motor type, but we specialize in flexible manufacturing for runs of 500 units or more.

Q: How does the noise level of the LWCA-60360UN-06-00 compare to standard 230V models?

A: The modified 115V model maintains the identical acoustic profile of 48 dB(A) as the standard 230V version. We achieve this by matching the 1700 RPM shaft speed and using the same precision ball bearings.

Q: Can this 60mm diameter impeller be modified for higher static pressure?

A: Generating more than 62 Pa static pressure with a 60 mm cross flow impeller requires an RPM increase, which raises power consumption above 33W and increases noise. If higher pressure is necessary, we recommend evaluating our centrifugal fan options.