Honeywell Notifier Fire Alarm Control Panel (FACP) Interoperability
The Honeywell Notifier 851 Series intelligent plug-in thermal detectors—encompassing the FST-851 fixed-temperature, FST-851R rate-of-rise, and FST-851H high-temperature models—are engineered for direct integration with Honeywell Notifier intelligent addressable fire alarm control panels. System communication is fully supported across both legacy Classic Loop Interface Protocol (CLIP) and high-speed FlashScan polling protocols.
Compatible control panels include:
- Notifier NFS-320 / NFS-320C: Supports addressable monitoring across both FlashScan and CLIP protocol loops.
- Notifier NFS-640 / NFS2-640: Full SLC loop communication and individual point annunciation.
- Notifier NFS-3030 / NFS2-3030: Large-scale commercial intelligent network panel integration.
Device addressing is managed manually via two integrated rotary decimal switches on the sensor head. When networked to systems running FlashScan mode, addresses range from 01 to 159 per loop. When connected to classic CLIP systems, addressing is configured from 01 to 99.
Signaling Line Circuit (SLC) Electrical Requirements
The 851 Series operates over a two-wire supervised Signaling Line Circuit (SLC). Proper communication and supervisory performance require strict adherence to the panel manufacturer's line resistance, capacitance, and voltage criteria:
- Operating Voltage Range: 15 to 32 VDC peak supplied across the two-wire loop.
- Standby Current: 300 µA maximum average at 24 VDC (based on one communication every 5 seconds with dual LEDs enabled).
- Alarm Active Current: 6.5 mA maximum at 24 VDC with the dual LEDs latched on continuously.
- Wiring Supervision: Two-wire SLC connection requires breaking the wire run at terminals 1 and 2 to maintain supervised electrical continuity; looping continuous conductors under terminals is prohibited.
Compatible Detector Mounting Bases
The detector head is a plug-in unit that requires a separate mounting base. The chosen base dictates the installed footprint and electrical accessory functions:
| Base Model | Base Type | Diameter | Application & Functional Notes |
|---|---|---|---|
| B501 / B501A | Flangeless Plug-in Base | 4.1 in (10.4 cm) | Compact mounting profile for standard junction box installations. |
| B210LP / B210LPA / B710LP | Flanged Low-Profile Base | 6.1 in (15.5 cm) | Standard commercial trim ring base covering standard junction boxes. |
| B200S / B200SA | Intelligent Sounder Base | Custom footprint | Addressable programmable notification base synchronized with panel events. |
| B200SR / B200SRA | Standard Sounder Base | Custom footprint | UL listed audible alert base driven by panel SLC signaling. |
| B224RB / B224RBA | Relay Base | Custom footprint | Provides Form-C dry auxiliary contacts mapped to sensor activation. |
| B224BI / B224BIA | Isolator Base | Custom footprint | Prevents an entire SLC branch from failing during short-circuit conditions. |
Annunciator Accessories & Marine Listing Compatibility
For remote status reporting, 851 Series units feature dedicated output circuitry designed to connect directly to the Honeywell Notifier RA100Z (or RA400Z) remote LED annunciator. The remote annunciator mirrors the dual 360-degree LED status indicators located on the detector faceplate.
When engineering marine fire protection systems, verify panel, detector, and base cross-compatibility according to specific marine agency approvals:
- U.S. Coast Guard Approval: Listed under 161.002/42/1 with the Notifier NFS-640; listed under 161.002/50/0 with the NFS2-640, NFS-320, and NFS-320C (strictly excluding the B210LP/B210LPA base).
- Lloyd's Register Approval: Certificate 11/600013 applies to installations using the NFS2-640, NFS-320, or NFS-320C control panels (strictly excluding the B210LP/B210LPA base).
Environmental compatibility must also guide device selection: deploy the FST-851 or FST-851R in locations within –4°F to 100°F (–20°C to 38°C); deploy the FST-851H in elevated-ambient applications spanning –4°F to 150°F (–20°C to 66°C).
