Figure 1. A421 Series control front panel with LCD display
| Callout | Description |
|---|---|
| 1 | LCD |
| 2 | Binary input indicator |
| 3 | Temperature units indicator |
| 4 | Operating mode indicator: heat or cool |
| 5 | Menu button |
| 6 | Down button |
| 7 | Relay status LED |
| 8 | Up button |