Bosch D122 User manual

Dual Battery Harnesses
D122L/D122
en Installation Instructions

Dual Battery Harnesses Introduction | en 3
Bosch Security Systems, Inc. Installation Instructions 2018.08 | 04 | F.01U.036.370
1 Introduction
The D122L and D122 Dual Battery Harnesses protect the installer and the battery with the
connection of two batteries, in parallel, to compatible Bosch Security Systems, Inc. B‑Series
and G‑Series Control Panels. The B‑Series Control Panels include the B4512 and B5512. The
G‑Series Control Panels include the D9412G, D7412G, D7212G, D9412GV2, D7412GV2,
D7212GV2, D9412GV3, D7412GV3, D7212GV3, D9412GV4, D7412GV4, and D7212GV4.
These harnesses use thermal circuit breakers to govern the circuits and to eliminate the
hazards of batteries connected in parallel. The positive side (red wire) of the harness is in
series with the circuit breaker. The harness breaks the electrical circuit of the battery when
the thermal rating is exceeded, and prevents the battery circuit from creating a potentially
harmful current overload condition.
!
Warning!
The control panels are internally protected, but if only one of the two batteries has reversed
polarity, dangerous current overloads can result.
This amount of current is extremely hazardous to human safety.
!
Warning!
Observe polarity!
Always connect the harness leads to the control panel before connecting the batteries. The
negative (black) wires connect to the BATTERY NEGATIVE terminal. The positive (red) wires
connect to the BATTERY POSITIVE terminal.
D122L dual battery harness with long leads
Use the D122L harness to connect a control panel to batteries located in a separate
enclosure. Do not use the battery cable supplied with the control panel with the D122L
harness.
Notice!
The D122L harness is required with control panel installations for UL Bank Safe and Vault
applications.
Figure1.1: D122 and D122L Dual Battery Harnesses
1 D122 Dual Battery Harness 6 P3 of D122 or D122L (red)
2 D122L Dual Battery Harness with Long
Leads
7 P4 of D122 or D122L (black)
3 P1 of D122 or D122L (red) 8 P5 of D122L (red)

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2018.08 | 04 | F.01U.036.370 Installation Instructions Bosch Security Systems, Inc.
4 P2 of D122 or D122L (blacl) 9 P6 of D122L (black)
5 Circuit breakers

Dual Battery Harnesses Installation | en 5
Bosch Security Systems, Inc. Installation Instructions 2018.08 | 04 | F.01U.036.370
2 Installation
To connect either harness to a D1218 Battery, insert the terminal adapters into the slip-on
spade connectors before connecting the harness to the bolt-fastened terminals on the D1218.
Figure2.1: Terminal Adapterfor connection to D1218 Battery
1 Slip-on spade connector 2 Terminal adapter
D122L dual battery harness
Notice!
Do not use the battery cable supplied with the control panel with the D122L harness.

6en | Installation Dual Battery Harnesses
2018.08 | 04 | F.01U.036.370 Installation Instructions Bosch Security Systems, Inc.
Figure2.2: Wiring a B- or G-Series panel to batteries in a separate enclosure with the D122L harness
1 D122L-P2 negative lead (black wire) 7 D122L-P5 positive lead (red wire) to
positive terminal on battery A
2 D122L-P1 positive lead (red wire) 8 D122L-P6 negative lead (black wire) to
negative terminal on battery B
3 D122L dual battery harness with long
leads
9 Battery B (12V)
4 D122L-P3 positive lead (red wire) to
positive terminal on battery A
10 Battery enclosure
5 D122L-P4 negative lead (black wire) to
negative terminal on battery A
11 G-Series panel in enclosure
6 Battery A (12V) 121B-Series panel in enclosure
1The B-series panel comes either with or without the cover. Each version is wired
identically.

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Bosch Security Systems, Inc. Installation Instructions 2018.08 | 04 | F.01U.036.370
1. Connect the forked terminals (D122L-P1 and D122L-P2) on the D122L to the control
panel terminals.
2. Connect the D122L harness slip-on spade connectors (D122L-P3 and D122L-P4) to the
terminals on Battery A, observing polarity. The circuit breaker in the harness now
protects the circuit for Battery A.
3. Connect the D122L harness slip-on spade connectors (D122L-P5 and D122L-P6) to the
terminals on Battery B, observing polarity. The circuit breaker in the harness now
protects the circuit for Battery B.
D122 dual battery harness
Figure2.3: Wiring a B- or G-Series panel to batteries in the same enclosure with the D122 harness
1 D122-P2 negative lead (black wire) 8 D122-P4 negative lead (black wire) to
negative terminal on battery A
2 D122-P1 positive lead (red wire) 9 D122-P5 positive lead (red wire) to
positive terminal on battery A
3 D122 dual battery harness 10 D122-P6 negative lead (black wire) to
negative terminal on battery B
4 Battery A (12V) 11 G-Series battery cable
5 Battery B (12V) 12 G-Series panel in enclosure
6 Terminal extenders/splitters 131B-Series panel in enclosure
7 D122-P3 positive lead (red wire) to
positive terminal on battery A
1The B-series panel comes either with or without the cover. Each version is wired
identically.
1. While observing polarity, connect the leads on the control panel battery cable to the
control panel terminals.
2. Connect the two brass terminal extender/splitters to the terminals on batteryA.

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2018.08 | 04 | F.01U.036.370 Installation Instructions Bosch Security Systems, Inc.
3. Connect the slip-on spade connectors on the control panel battery cable to the terminal
extender/splitters on batteryA, observing polarity. An internal circuit breaker in the
control panel now protects the circuit for batteryA.
4. Connect the D122 harness slip-on spade connectors (D122-P1 and D122-P2) to the
terminal extender/splitters on batteryA, observing polarity.
5. Connect the battery harness slip-on spade connectors (P3 and P4) to the terminals on
batteryB, observing polarity. The circuit breaker contained in the D122 harness now
protects the circuit for batteryB.

Dual Battery Harnesses Technical data | en 9
Bosch Security Systems, Inc. Installation Instructions 2018.08 | 04 | F.01U.036.370
3 Technical data
Mechanical
Harness length
– D122: ~18in. (457mm)
– D122L ~46in (1168mm)