How to identify this generation
- Model label includes 6820U; the U suffix matters.
- ULTRA generation is the current replacement line for earlier 6820/5820XL installations.
- Manufacturer
- Silent Knight / Farenhyt
- Family
- ULTRA Series
- Generation
- ULTRA
Silent Knight / Farenhyt · ULTRA Series
6820U Fire Alarm Panel Reference
Current Silent Knight ULTRA addressable FACP generation and direct replacement platform for the earlier 6820/5820XL family.
Manufacturer documentation
Official product / platform page
Silent Knight Document Center — Honeywell
No public manufacturer manual verified from the current product page.
FireAlarmGuy links manufacturer-hosted material only when it can be verified on the manufacturer’s own site.
Field notes
- Confirm 6820U versus 6820 before following programming or firmware guidance.
- Verify SLC protocol/device compatibility on retrofit work.
- Document network and communicator configuration before replacement or upgrade work.
Use the exact generation. Similar model names can have different hardware, firmware, menus, programming tools, device support, and service procedures.
Ask Fire Alarm Guy AI with the panel already identified
The button carries Silent Knight / Farenhyt 6820U into the AI question so a short field question like “what does audio riser trouble mean?” keeps the exact panel context.