Bosch D129 Specsheet

Fire Alarm Systems | D129 Dual Class A Initiating Circuit Module

D129 Dual Class A Initiating Circuit Module

www.boschsecurity.com

u Adjustable alarm and reset delays

u Provides two supervised Class A (Style D) loops

u Reliable terminal connections

The D129 Dual Class A Initiating Circuit Module is a
fire system interface for compatible Bosch Fire Alarm
Control Panels. The D129 Module has two NFPA Class
A (Style D) circuits suitable for use with retarded and
non-retarded sprinkler waterflow switches. Each
circuit has screwdriver-adjustable potentiometers for
alarm retard and alarm reset delay. Separate alarm
and retard delay potentiometers for each loop allows
connecting different types of initiating devices on one
module. Adjust the delay periods to compensate for
sprinkler flow valve fanning. Multi-family occupancies,
office buildings, and institutional facilities are typical
installations where either or both sprinkler and
mechanically-actuated devices are required.

Functions

Style D Circuits

The Style D circuit is a four-wire loop with a feed and
return for both the positive and negative sides of the
loops. Unlike two-wire loops supervised by end-of-line
resistance, Style D circuits can detect alarm
conditions even though there is a single open or
ground fault in the circuit.
Loop inputs on the D129 module which are not used
are terminated with jumpers so they appear as normal
loops to the control panel.

u Suitable for waterflow switches

u Compensates for sprinkler alarm valve fanning

Waterflow Alarm

When using non-retarded waterflow switches on a wet
pipe sprinkler system, the D129 module can provide
each set of loop inputs with an alarm retard period to
compensate for water pressure surges. The maximum
retard time is approximately 90 seconds.

Notice

Use the alarm retard only for wet pipe sprinkler
systems using non-retarded waterflow switches.

Certifications and approvals

Region Certification

USA UL UOJZ: Control Units, System (UL864,

9th edition)

CSFM see our website

FDNY-

#6174 UL 864 9th Edition

CoA

NYC-

12-92-E, Vol. 12 12-92-E, Vol. 12

MEA

NYC-

12-92-E, Vol. XV

MEA

2 | D129 Dual Class A Initiating Circuit Module

Installation/configuration notes

Compatible Products

The following Bosch control panels are compatible
with the module:

Active products:

GV41, GV32, and GV23 panels

Legacy*

D9412G, D7412G, D7212G**, D9412, D7412, D7212** and
D7212B1** panels

D9112B1 and D9112 panels

D8112 panel

D7112 panel

1

GV4 = D9412GV4, D7412GV4, and D7212GV4** panels

2

GV3 = D9412GV3, D7412GV3, and D7212GV3** panels

3

GV2 = D9412GV2, D7412GV2, and D7212GV2** panels

* Legacy products were investigated to comply only to UL864 8th
edition

** indicates products which are not UL listed for commercial fire
applications

Power Requirements

Current (alarm): 25 mA maximum

Current (standby): 23 mA maximum

Voltage: 12 VDC nominal

Ordering information

D129 Dual Class A Initiating Circuit Module

The D129 Dual Class A Initiating Circuit module is a
fire system interface for fire alarm and water‑flow
alarm applications, the module has two Class A
(Style D) circuits, each with a screwdriver adjustable
Alarm Retard and Alarm Reset Delay.

Order number D129

Accessories

D137 Mounting Bracket

Used to mount accessory modules in D8103, D8108A,
and D8109 enclosures.

Order number D137

Mounting

The D129 module mounts in a Bosch control panel
enclosure or in an adjacent approved enclosure.
Auxiliary enclosures must be connected to the control
panel enclosure by metal conduit not more than 20 ft
(6 m) long. A D137 Mounting Bracket is optional.

Wiring

The initiating device circuits wire directly to the D129
module using the on-board terminal connections.
When both Style D loops are being used, connect the
module to the appropriate control panel with five
separate conductors. Only four conductors are
required if using only one of the Style D loops.

Parts included

Quant. Component

1 Initiating circuit module

1 Hardware pack

1 Literature pack

Technical specifications

Mechanical Properties

Dimensions (HxWxD): 5 in. x 3 in. x 0.75 in.

(12.7 cm x 7.6 cm x 1.9 cm)