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| Specification | THM5421R1021 Equipment Interface Module |
|---|---|
| Brand | Honeywell Home |
| Model | THM5421R1021 |
| SKU | 365481 |
| Component role | Equipment controller |
| Lifecycle | Current |
| Building systems | |
| Requires | Not specified |
| Communication protocols | RedLINK |
| Heating and cooling stages | Heat pump: Up to 4 heat / 2 cool; Conventional: Up to 3 heat / 2 cool |
| Power sources | Hardwired |
| Supply voltage | 18–30 Vac |