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Dual Battery Harnesses
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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
Bosch Security Systems, Inc.
1 D122 Dual Battery Harness
2 D122L Dual Battery Harness with Long
Leads
3 P1 of D122 or D122L (red)
Installation Instructions
Introduction | en
6 P3 of D122 or D122L (red)
7 P4 of D122 or D122L (black)
8 P5 of D122L (red)
2018.08 | 04 | F.01U.036.370
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