General Assist Technical Reference
VRF Cassette Family Comparison
AUXD / AUXA legacy 4-way cassettes vs AUXM / AUXK Circular Flow cassettes
Selection guidance for large-chassis VRF cassette indoor units
There are no functional capacity conflicts between the listed models. The key differences relate to generation, design, airflow, control interface capability and integration maturity.
1. Product family overview
- All four part codes are large-chassis VRF cassette indoor units.
- They are designed for higher-capacity commercial applications.
- They are broadly comparable in capacity, but are not equivalent in generation or feature set.
2. Legacy vs current cassette families
| Feature | AUXD24GALH / AUXA24GALH | AUXM024GLEH / AUXK024GLEH |
|---|---|---|
| Generation | Older / legacy platform | Newer / current platform |
| Airflow design | Traditional 4-way discharge cassette | Circular Flow Cassette design |
| Historical position | Historically the standard choice for large-capacity cassette applications | Current preferred solution for large-capacity VRF cassette applications |
| UART interface | No UART interface | UART interface included |
| Controls / integration | More limited advanced integration capability | Improved controls compatibility and broader system-integration options |
| Aesthetics | Legacy appearance | Significantly improved aesthetics |
| Best suited to | Replacement or matching existing installations where legacy control limitations are acceptable | New projects and installations requiring stronger control integration or future upgrade flexibility |
Important: The difference is not primarily capacity. Selection should consider the system generation and the controls/interface requirements of the project.
3. Slim vs Normal chassis
Both the older and newer cassette ranges are available in Slim and Normal chassis variants.
| Variant | Characteristics | Considerations |
|---|---|---|
| Slim | Reduced unit height | Lower airflow capacity; useful where ceiling-space constraints are the priority |
| Normal | Taller chassis | Higher airflow and potentially marginally different sound levels |
Selection implication: Choose Slim or Normal based on ceiling-space constraints, airflow requirements and acoustic expectations.
4. Recommended guidance
| Application | Recommended approach |
|---|---|
| New projects | Specify AUXM / AUXK Circular Flow Cassettes wherever possible. |
| Replacement / matching existing systems | AUXD / AUXA may still be appropriate where legacy integration limitations are acceptable. |
| Controls, BMS or future upgrades are important | Prefer AUXM / AUXK. Avoid AUXD / AUXA where the lack of UART or newer integration capability would create a constraint. |
5. Summary
The key differences are generation, control interface capability, airflow design, aesthetics and integration maturity - not basic capacity. These differences should be made clear during specification, quoting and service discussions so the correct cassette family is selected for the intended application.