Installation Instructions

Callout ᅳ Description
6 ᅳ 12 V sealed lead-acid rechargeable battery (D126/D1218)
7 ᅳ Sensor loop wires
Charge the battery
Connect the battery and then the transformer to allow the
control panel to charge the battery while you complete the
installation.
Battery maintenance
Use 12 VDC sealed lead-acid rechargeable battery (7 Ah or 18
Ah). The control panel supports up to 18 Ah of battery. If you
use two batteries, they must have the same capacity and you
must connect them using the D122/D122L Dual Battery Harness.
Replace the batteries every 3 to 5 years. If you install two
batteries, replace them both at the same time.
Record the date of installation directly on the battery.
!
Caution!
Exceeding the maximum output ratings or installing the
transformer in an outlet that is routinely switched off causes
heavy discharges. Routine heavy discharges can lead to
premature battery failure.
Battery supervision
The battery charging float level occurs at 13.65 VDC. If the
battery voltage drops below 12.1 VDC, the control panel sends a
LOW BATTERY report, if programmed to do so.
When the battery voltage drops to 10.2 VDC, the keypad or
keypads show low battery messages. The control panel (if
programmed for power supervision) sends a Battery Low report
in the Modem4 communication format. It sends a Low System
Battery (302) report in the Contact ID format.
4.2.2
4.2.3
Control Panels Power supply | en 21
Bosch Security Systems, Inc. 2015.09 | 08 | F.01U.287.185