Description
2251B System Sensor Photoelectric Smoke Detector.
Model 2251B System Sensor is a plug-in type smoke sensor that combines a photoelectronic sensing chamber with addressable-analog communications. The sensor transmits an analog representation of smoke density over a communication line to a control panel. Rotary-decade switches are provided for setting the sensor’s address. The 2251B System Sensor requires compatible addressable communications to function properly. Connect these sensors to listed-compatible control panels only
SPACING
System Sensor recommends spacing sensors in compliance with NFPA 72. In low airflow applications with smooth ceilings, space sensors 30 feet apart. Duct Applications: 2251B is listed for use in ducts. Note: 2251B is listed for use inside DNR(W) duct smoke detectors.
BEFORE INSTALLING
This sensor must be installed in compliance with the control panel system installation manual. The installation must meet the requirements of the Authority Having Jurisdiction (AHJ). Sensors offer maximum performance when installed in compliance with the National Fire Protection Association (NFPA).
2251B SYSTEM SENSOR TESTING
Before testing, notify the proper authorities that the system is undergoing maintenance, and will temporarily be out of service. Disable the system to
prevent unwanted alarms. All sensors must be tested after installation and periodically thereafter. Testing methods must satisfy the Authority Having Jurisdiction (AHJ). Sensors offer maximum performance when tested and maintained in compliance with NFPA 72.
2251B SYSTEM SENSOR CLEANING
Before removing the detector, notify the proper authorities that the smoke detector system is undergoing maintenance and will be temporarily out of service. Disable the zone or system undergoing maintenance to prevent unwanted alarms.
- Remove the sensor to be cleaned from the system.
- Remove the sensor cover by pressing firmly on each of the four removal tabs that hold the cover in place.
- Vacuum the screen carefully without removing it. If further cleaning is required continue with Step 4, otherwise, skip to Step 7.
- Remove the chamber cover/screen assembly by pulling it straight out.
- Use a vacuum cleaner or compressed air to remove dust and debris from the sensing chamber.
- Reinstall the chamber cover/screen assembly by sliding the edge over the sensing chamber. Turn until it is firmly in place.
- Replace the cover using the LEDs to align the cover and then gently pushing it until it locks into place. Make sure that the thermistors do not become bent under the cover on 2251TB and 2251TMB models.
- Reinstall the detector.
- Test the detector as described in TESTING.
- Reconnect disabled circuits.
- Notify the proper authorities that the system is back online.
Datasheet 2251B.
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