Bosch D125B Installation Manual
Dual Class B Initiating Module
D125B
en Installation Instructions
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Dual Class B Initiating Module Notices | en 3
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2
Notices
These instructions cover the installation of the D125B Dual Class B Initiating Module in a fire
system supervised by a fire alarm control panel (FACP) or a combination Burglary/Fire control
panel.
Before installing the module, become familiar with the Installation and Operation Guide for the
control panel you are using.
Install, test and maintain the module according to these instructions, NFPA 72, local codes,
and the authority having jurisdiction (AHJ). Failure to follow these instructions can result in
failure of a detector to initiate an alarm event. Bosch Security Systems, Inc. is not responsible
for improperly installed, tested or maintained devices.
Warning!
Follow these instructions to avoid personal injury and damage to equipment.
NFPA 72 requires that you perform a complete system wide functional test following any
modifications, repair, upgrades or adjustments made to the system’s components, hardware,
wiring, programming and software/firmware.
Description
Use this module to connect up to 2 two‑wire powered loops (Class B [Style B]) to separate
on‑board points on the compatible Bosch Security Systems, Inc. control panels listed in the
table below. These loops are powered with nominal 12 VDC or 24 VDC for compatible smoke
detectors or glassbreak devices. You can also use any dry contact device with this module.
Control Panels Compatible modules Compatible relays See figures:
Active Products:
GV4 panels
B-series panels
1
2
D8128D, B208 D130, D133, D134 5.3 & 5.5
B208 D133 and D134 5.2 & 5.4
GV33 and GV24 panels D8128D D130 5.3 & 5.5
Legacy Products:*
G panels
D9412, D7412, D7212*
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See control panel’s documentation on the Bosch website
(http://www.boschsecurity.com)
D9112B1, D7212B1
D8112
1
GV4 = D9412GV4, D7412GV4, and D7212GV4**
2
B Series = B5512**, B4512** and B3512**
3
GV3 = D9412GV3, D7412GV3, and D7212G3**
4
GV2 = D9412GV2, D7412GV2, and D7212GV2**
5
G = D9412G, D7412G, and D7212G**
* Legacy products were investigated to comply only to UL864 8th edition
** indicates products which are not UL Listed for commercial fire applications.
Bosch Security Systems, Inc. Installation Instructions 2013.08 | 03 | F.01U.036.340
4 en | Notices Dual Class B Initiating Module
Figure 2.1: D125B powered loop interface module
1 Power-limited, supervised switched
auxiliary power (detector reset)
7 Power-limited, supervised negative to
A loop detectors
3
3.1
2 Supervised connection to protective
zone or point on the control panel
3 Supervised connection to protective
zone or point on the control panel
4 Connect to only one common at the
panel
5 Connect to only one common on the
control panel
6 Power-limited, supervised negative to
B loop detectors
8 Power-limited, supervised positive to B
loop detectors
9 Power-limited, supervised positive to A
loop detectors
10 Earth ground
11 Mounting holes
Operation
The module can be powered from the control panel’s switched auxiliary power output or from
an external auxiliary power supply. Currently, the control panels can only supply 12 VDC, but
external power supplies can provide either 12 VDC or 24 VDC.
For wiring details, see Wiring, page 6.
Power from the control panel
In this mode, the control panel switched auxiliary power output supplies regulated,
power‑limited, supervised 12 VDC power to the module. The switched power output allows all
detectors connected to the module to be reset by interrupting power using the Reset Sensor
command. See Wiring for 12 VDC power supplied by the control panel, page 7.
2013.08 | 03 | F.01U.036.340 Installation Instructions Bosch Security Systems, Inc.
Dual Class B Initiating Module Notices | en 5
3.2
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Power from an external auxiliary power supply
Use a separate power supply listed for fire signaling units and/or commercial or residential
burglary units. Depending on compatibility with the control panel, a D130, D133, or D134
Relay can be required to reset the smoke detectors using the Reset Sensor command. See
Wiring for 12 VDC or 24 VDC power supplied by an external power supply, page 8.
The external power supply must be UL1481 or UL864 Listed, regulated, and power‑limited.
Install the control panel and external power supply in the same room no more than 20 ft (6 m)
apart. The interconnecting wires between the control panel and external power supply must
be in conduit.
The power source for both the auxiliary power supply and the control panel must be from the
same dedicated AC branch circuit.
Installation
The module can be mounted in the D8103, D8108A, D8109, D8109G, D8109H, or D8109L
Enclosures. Only the D8108A and D8109 models are suitable for commercial fire applications.
The D8108A and D8109L enclosures require use of a D137 Mounting Bracket to install the
module. The other enclosures have several module mounting locations to which the module
can be installed using the supplied screws. Refer to the D137’s and the enclosure’s
Installation Instructions for mounting locations and instructions.
Bosch Security Systems, Inc. Installation Instructions 2013.08 | 03 | F.01U.036.340
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