User guide

Model MS-25 Installation and Operation Manual
3-10 53688
3.6.2 Maximum Battery Standby Load for UL 864
Table 3-4 shows the standby load calculations for the MS-25 based on 24 hours of standby.
The standby load calculations of line D in the Current Draw Calculation Worksheet must be
less than the number shown in Table 3-4 for the selected battery size, standby hour and alarm
time. The numbers below have a built in 20% derating factor for the battery amp hour
capacity.
3.6.3 Maximum Battery Standby Load for ULC
Table 3-5 shows the ULC standby load calculations for the MS-25C based on 24 hours of
standby. The standby load calculations of line D in the Current Draw Calculation Worksheet
must be less than the number shown in Table 3-5 for the selected battery size, standby hour
and alarm time. The numbers below have a built in 40% derating factor for the battery amp
hour capacity.
Table 3-5: Maximum Battery Standby loads for ULC 24 Hour Standby
Table 3-4: Maximum Battery Standby loads for 24 Hour Standby
Rechargeable
Battery Size
24 hr Standby,
5 mins. Alarm
24 hr Standby,
15 min alarm
24 hr Standby,
20 min alarm
7 AH 226 mA 213 mA 206 mA
12 AH 393 mA 379 mA 372 mA
18 AH 593 mA 579 mA 572 mA
24 AH 793 mA 779 mA 772 mA
33 AH 1.09 A 1.08 A 1.07 A
Rechargeable
Battery Size
24 hr Standby,
5 mins. Alarm
24 hr Standby,
15 min alarm
24 hr Standby,
20 min alarm
7 AH 226 mA 213 mA 206 mA
12 AH 393 mA 379 mA 372 mA
18 AH 529 mA 515 mA 508 mA
Warning
Fire-Lite does not support the use of batteries smaller than those listed in Table 3-4. If you use a battery too small
for the installation, the system could overload the battery resulting in the installation having less than the required
24 hours standby power. Use Table 3-2 to calculate the correct battery amperes/hour rating needed for your instal-
lation. It is recommended that you replace batteries every five years.