Following a review of the listed part codes, there are no functional capacity conflicts; however, there are clear generational, design, and interface differences that should be considered when specifying or supporting these models.
1. Product Family Overview
All four part codes are:
Large chassis VRF cassette indoor units
Designed for higher-capacity commercial applications
Comparable in capacity, but not equivalent in generation or feature set
2. Older Generation – 4-Way Flow Cassette (Legacy Platform)
Models:
AUXD24GALH
AUXA24GALH
Key Characteristics:
Traditional 4-way discharge cassette
Historically the standard choice for large-capacity cassette applications
Older generation control platform
No UART interface (limits advanced integration and controls capability)
Functional and reliable, but now considered legacy design
3. Newer Generation – Circular Flow Cassette (Current Go-To)
Models:
AUXM024GLEH
AUXK024GLEH
Key Characteristics:
Circular Flow Cassette design
Current preferred solution for large-capacity VRF cassette applications
Includes UART interface, enabling improved integration, controls, and future-proofing
More recent platform with:
Improved control compatibility
Enhanced system integration options
Significantly improved aesthetics
4. Slim vs Normal Chassis (Applies Across Both Ranges)
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 |
| Normal | Taller chassis | Higher airflow and potentially marginally different sound levels |
Implication:
Selection should be based on ceiling constraints, airflow requirements, and acoustic expectations.
5. Recommended Guidance
For new projects:
? Specify AUXM / AUXK Circular Flow Cassettes wherever possible.For replacement or matching existing systems:
? AUXD / AUXA may still be appropriate where integration limitations are acceptable.Where controls, BMS integration, or future upgrades are a priority:
? Avoid AUXD / AUXA and specify AUXM / AUXK.
6. Summary Statement
In short, the differences are not capacity-related, but rather:
Generation
Control interface capability
Airflow design
Aesthetic and integration maturity
This distinction should be clearly communicated during specification, quoting, and service discussions to ensure the correct product is selected for the intended application.