Brand: Honeywell
Category: Fire Alarm Systems
Document Type: Installation Guide
Language: EN
Installation Guide for FSP-951 and FSP-951-IV
Uploaded: Nov. 21, 2025, 6:56 p.m.
Manual Publish Date: 2017-10-05
Warranty Information
None
The FSP-951 and FSP-951-IV are intelligent photoelectric smoke sensors that combine a sensing chamber with addressable-analog communications. They transmit an analog representation of smoke density to a control panel. Rotary dial switches are used to set the sensor's address. The sensors have two LEDs controlled by the panel for status indication, and an output for an optional remote LED annunciator. They support FlashScan® protocol mode, with the FSP-951-IV also supporting CLIP mode. Sensors require compatible addressable communications and must be connected to listed-compatible control panels. Spacing recommendations are provided based on NFPA 72 guidelines. The sensors are also listed for duct applications. Installation requires compliance with the National Electrical Code and local codes. Power must be removed from the communication line before installation. Wiring diagrams and address setting instructions are provided. Dust covers must be removed before use. Sensors should be removed during heavy remodeling.
Troubleshooting and error codes
| Trouble | Possible Cause | Solution |
|---|---|---|
| Sensor not communicating | Incorrect wiring | Check wiring diagram (Figure 2). Ensure proper connections and wire gauge. Break wire run to supervise connections. |
| Incorrect address setting | Verify the address set on the rotary switches (Figure 1) matches the address programmed in the control panel. | |
| Faulty sensor or base | Test sensor with a known working base, or test a known working sensor with the suspected base. Replace if necessary. | |
| Sensor fails magnet test | Dirty sensing chamber | Clean the sensor as described in the CLEANING section. Retest. |
| Faulty sensor electronics | Replace the sensor. | |
| Alarm condition not indicated on panel | Incorrect wiring to panel | Verify all control panel wiring is correct and meets specifications. |
| Panel configuration error | Ensure the sensor type and address are correctly configured in the control panel. Consult the control panel manual. | |
| LEDs not functioning as expected | Panel control issue | Refer to the control panel technical documentation for sensor LED status operation and expected delay to alarm. LED behavior is controlled by the panel. |
| Dust cover not removed | Sensor covered during operation | Ensure the dust cover has been removed before attempting to sense smoke. |