4.1.3 Connecting the battery harness
To connect the main battery harness to the 0.25 in. fast-on battery terminals, complete the following steps:
1. Connect the black wire to the negative battery terminal of Battery 1.
2. Connect the Gray / White wire (jumper) from the positive battery terminal of Battery 1 to the negative battery terminal of Battery
2.
3. Do not connect the red wire at this time.
4. Connect the battery harness to the battery terminal (TB6) on the system board.
Note:
• Red wire is connected to positive terminal of battery 2 during powering up.
• Ensure that the battery terminals face the front of the box.
Figure 8: Connecting the battery harness
4.1.4 Minimizing power losses
The 2250 control unit's battery charger supports up to maximum of 25 Ah batteries within UL 864 guidelines. 18 Ah batteries can fit
inside the cabinet. For batteries greater than 18Ah, an external battery box (4009-9801) is required.
Wiring the control unit from the external battery box can cause power losses. To minimize power losses, complete the following steps:
1. Use a 12 AWG wire.
2. Mount the battery box less than 20 feet or 609.6 cm of the control unit.
3. Enclose all interconnecting wiring in conduit.
4. The battery circuit is supervised, but not power-limited.
page 15 579-1404 Rev A
2050 and 2250 Foundation Series Fire Alarm Control Units Installation Guide
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