Bosch D256A 전단
2 | D256A/D257A Fixed‑temperature, Rate‑of‑Rise Heat Detector Heads
Category
Product ID
Product Description
Control Panels
D7022
Conventional FACP
D7024
Conventional FACP
D7024
Addressable FACP
D7212
Addressable control panel
D7212G
Addressable control panel
D7412
Addressable control panel
D7412G
Addressable control panel
D9112
Addressable control panel
D9412G
Addressable control panel
D9124
Addressable FACP
Detector Bases
D250A
Two‑wire detector base (12 VDC or
24 VDC)
D280A
Two-wire detector base (24 VDC)
D290
Four‑wire detector base (24 VDC)
D291M
Master addressable detector base
(24 VDC)
D291S
Addressable detector base (24 VDC)
Note
These heat detectors do not operate on
standard 12 VDC two-wire loops; they require
24 VDC. When used with 12 VDC control
panels, a UL Listed 24 VDC auxiliary power
supply is required.
standard 12 VDC two-wire loops; they require
24 VDC. When used with 12 VDC control
panels, a UL Listed 24 VDC auxiliary power
supply is required.
Mounting
The detector base installs over a back box and contains all
the wiring. The detector head attaches to the base by hand
by aligning the head with the base and turning it clockwise.
No tools are required for installation other than the hex key
used to tighten the tamper screw.
Wiring
Refer to the installation instructions for the specific base
for detailed wiring requirements.
The detector base installs over a back box and contains all
the wiring. The detector head attaches to the base by hand
by aligning the head with the base and turning it clockwise.
No tools are required for installation other than the hex key
used to tighten the tamper screw.
Wiring
Refer to the installation instructions for the specific base
for detailed wiring requirements.
Parts Included
Quant.
Component
1
D256A or D257A detector head
1
Literature pack
Technical Specifications
Environmental Considerations
Temperature (am-
bient):
D256A: +32°F to +120°F (0°C to +49°C) D257A:
+32°F to +160°F (0°C to +71°C)
Note: The normal environment where these detectors are installed should
be within the specified ambient temperature limits.
Mechanical Properties
Color:
Bone white
Dimensions (diameter x D):
6 in. x 2 in. (15.2 cm x 5 cm)
Power Requirements
Current (alarm):
150 mA at 24 VDC
Current (supervisory):
0.04 mA at 24 VDC
Current (surge):
0.160 mA at 24 VDC
Voltage (operating):
15.0 VDC to 33.0 VDC
Ordering Information
D256A Fixed-temperature (135°F [57°C]),
Rate-of-Rise Heat Detector Head
Rate-of-Rise Heat Detector Head
Fixed‑temperature (135°F [57°C]),
rate‑of‑rise mechanical heat detector head for
use in 12 VDC or 24 VDC nominal circuits; re-
quires a base.
D256A
D257A Fixed-temperature (190°F [88°C]),
Rate-of-Rise Heat Detector Head
Rate-of-Rise Heat Detector Head
Fixed‑temperature (190°F [88°C]),
rate‑of‑rise mechanical heat detector head for
use in 12 VDC or 24 VDC nominal circuits; re-
quires a base.
D257A
Americas:
Bosch Security Systems, Inc.
130 Perinton Parkway
Fairport, New York, 14450, USA
Phone: +1 800 289 0096
Fax: +1 585 223 9180
security.sales@us.bosch.com
www.boschsecurity.us
Europe, Middle East, Africa:
Bosch Security Systems B.V.
P.O. Box 80002
5600 JB Eindhoven, The Netherlands
Phone: + 31 40 2577 284
Fax: +31 40 2577 330
emea.securitysystems@bosch.com
www.boschsecurity.com
Asia-Pacific:
Robert Bosch (SEA) Pte Ltd, Security Systems
11 Bishan Street 21
Singapore 573943
Phone: +65 6258 5511
Fax: +65 6571 2698
apr.securitysystems@bosch.com
www.boschsecurity.com
Represented by
© Bosch Security Systems Inc. 2010 | Data subject to change without notice
T1474426507 | Cur: en-US, V6, 4 Jul 2010