Before Installing
Please read thoroughly System Sensor manual A05-1003, Applications Guide for System Smoke Detectors, which provides detailed information on detector spacing, placement, zoning, wir- ing, and special applications. Copies of this manual are available from System Sensor at no charge.
NOTICE: This manual shall be left with the owner/user of this equipment.
IMPORTANT: This detector must be tested and maintained regu- larly following NFPA 72 requirements. At a minimum, cleaning should be performed annually.
General Description
Models 2W-B and 2WT-B are 2-wire photoelectric smoke detec- tors; models 4W-B and 4WT-B are 4-wire photoelectric smoke detectors. All models incorporate a state-of-the-art optical sensing chamber and an advanced microprocessor. The microprocessor allows the detector to automatically adjust its sensitivity back to the factory setting when it becomes more sensitive due to contaminants settling in its chamber. In order for this feature to work properly, the chamber must never be opened while power is applied to the smoke detector. This includes cleaning, maintenance or screen replacement. Should it become necessary, the screen/sensing chamber is field replaceable. Models 2WT-B and 4WT-B also feature a restorable, built-in, fixed temperature (135°F) thermal detector and are also capable of sensing a freeze condition if the temperature is below 41°F.
All i3 Series detectors are designed to provide open area protec- tion. Two-wire models must be used with compatible UL Listed panels only.
When used with an i3 Series compatible control panel or the i3 Series 2W-MOD module (refer to installation manual D500-46-00), the 2W-B and 2WT-B are capable of generating a “maintenance needed” signal. The 2W-MOD can indicate a need for cleaning, replacement, or a freeze condition (2WT-B only) at the control panel or module.
Installation of the 2W-B, 2WT-B, 4W-B, and 4WT-B detectors is simplified by the use of a mounting base that may be pre-wired to the system, allowing the detector to be easily installed or removed. The mounting base installation is further simplified by the incorporation of features compatible with drywall fasteners.
Two LEDs on the detector provide a local visual indication of the detector’s status:
Table 1: Detector LED Modes
| Green LED | Red LED |
Power-up | Blink 10 sec | Blink 10 sec |
Normal (standby) | Blink 5 sec | — |
Out of sensitivity | — | Blink 5 sec |
Freeze Trouble | — | Blink 10 sec |
Alarm | — | Solid |
After an initial power-up delay, the red and green LEDs will blink synchronously once every ten seconds. It will take approximately 80 seconds for the detector to finish the power-up cycle (see Table 2).
Table 2: Power-up Sequence for LED Status Indication*
Condition | Duration |
Initial LED Status Indication | 80 seconds |
Initial LED Status Indication | 4 minutes |
(if excessive electrical noise is present) | |
*Refer to Electrical Specifications for start-up time in conjunction with panel alarm verification.
NOTE: If, during power-up, the detector determines there is excessive electrical noise in the system such as those caused by improper grounding of the system or the conduit, both LEDs will blink for up to 4 minutes before displaying detector status (see Table 2).
After power-up has completed and the detector is functioning normally within its listed sensitivity range, the green LED blinks once every five seconds. If the detector is in need of maintenance because its sensitivity has shifted outside the listed limits, the red LED blinks once every five seconds. When the detector is in the alarm mode, the red LED latches on. The LED indication must not be used in lieu of the tests specified under Testing. In a freeze trouble condition, the red LED will blink once every 10 seconds (refer to Table 1).
To measure the detector’s sensitivity, the i3 Series Model SENS- RDR Infrared Sensitivity Reader tool (see Figure 4) should be used.
Models 2W-B and 2WT-B also include an output that allows an optional Model RA400Z Remote Annunciator to be connected.
Series