Use the Bosch D254 and D255 Fixed Temperature Heat Detectors for indoor confined areas where a fire increases air temperature slowly and where there is a substantial increase in air temperature before the fire
breaks confinement. Furnace rooms, closets, bathrooms, and other confined areas are appropriate applications for fixed temperature detectors.
Furthermore, use the Bosch D254 (response-rated at 135°F [57°C]) in areas where the ambient temperatures do not exceed 100°F (38°C). Also, use the D255 (response-rated at 190°F [88°C]) in areas where the ambient temperatures do not exceed 150°F (66°C). These detectors operate in 12 and 24 VDC detection circuits using a variety of Bosch detector bases. A latching steady-on LED is available when these heads are used with the D253 24 VDC base or the D271S 12 VDC base.
These heat detectors have two components: the detector base and the detector head. The bases are permanently attach and wire to back boxes. The interchangeable heads quickly detach for replacement and cleaning without affecting the circuit wiring.
Features / Specifications
- Mounts on low-profile six-inch diameter base
- Easy head removal for cleaning and servicing
- Available in 135°F (57°C) or 190°F (88°C) fixed settings
- Optional latching alarm LED
- Tamper-resistant locking base