Data Sheet for Product

Siemens
Smart Infrastructure - Building Products
–2–
usa.siemens.com/fire
Detector Supervision and Testing
Model HI921 contains a tri-color LED indicator, capable of flashing any one (1) of three (3) distinct colors: GREEN |
YELLOW | RED. During each flash interval, the microprocessor-based detector monitors the following fire-system
conditions:
• Temperatures reaching programmed thresholds
• Internal sensors and electronics are functional
Based on the results of the monitoring, the LED indicator flashes the following:
FLASH COLOR
CONDITION
FLASH INTERVAL
[in seconds]
GREEN

:
Normal supervisory operation.
Temperature has not reached programmed
alarm thresholds or set points.
10
YELLOW:
Detector is not operating at
normal capacity and needs replacement.
4
RED:
`Alarm’ condition
1
NO FLASH:
Detector is not powered.
–

denotes LED can be turned OFF
Please follow the corresponding description of the panel used.
A quick visual inspection is sufficient to indicate the condition of the detector at any time.
If more detailed information is required, a printed report can be provided from the respective Cerberus PRO Modular
| FireFinder XLS/V or Model FC9-series FACPs that indicates the status and settings assigned to each detector.
Installation
All Model HI921 detectors use a surface-mounting base, Model DB2-HR | DB-11 or Model DB-11E, which mounts on a
4-inch (10.2 cm.) octagonal, square or single-gang electrical box. The base utilizes screw-clamp contacts for electrical
connections and self-wiping contacts for increased reliability.
The Model DB-11 detector base can be used with the optional Siemens Model LK-11 detector locking kit, which contains
50 detector locks and an installation tool to prevent unauthorized removal of the detector head. Model DB-11 has
aesthetically conducive plugs to cover the outer mounting-screw holes.
Model HI921 may be installed on the same initiating circuit with the Siemens Model `H’-series detectors and
devices [when used with Cerberus PRO Modular | Model FC9-series | FireFinder XLS/V FACPs] –
• HFP-11, HFPT-11
• Model `XTRI’-series interfaces
• Model `XMS’-series manual stations
• Model `HTRI’-series interfaces
• Model `HMS’-series manual stations
• Model HCP output-control detection devices
• Model `HZM’-series of addressable, conventional zone modules
Model HI921
1. Thermistor
1. Dust cover
2. Thermal (heat) detector
NOTE: Each detector consists of a dust-
resistant chamber; a solid state,
functional internal sensor, and
microprocessor-based electronics with a
low-profile plastic housing.
Every Model HI921 fire detector is
shipped with a protective dust cover.
1
.
2.