Hardware Installation—IFC-200 Hardware Installation Procedures 45
Table 8 allows you to determine the current requirements of the secondary
power source (batteries) during standby conditions. The current ratings in
Table 8 account for the continuous activation of trouble signals and
indications. The total obtained in Table 8 will be used in Table 10 to
determine the size of the batteries needed to support 24 or 60 hours of
standby operation.
In Table 8, use the manufacturer’s standby current draw specified on the
data sheet packaged with each four-wire smoke detector, or refer to the
appropriate product literature in the Standard Equipment section of the
Fire Initiating and Annunciating Devices Technical Manual (FAN 408).
Table 8: Secondary Power Standby Requirements (@24 VDC)
Device Type
Total Current/Type
IFC-200
0.100
External Devices (Total from Table 6)
Sum Column for Secondary Standby Load
amps
Table 9 allows the system designer to determine the maximum current
requirements of the secondary power source during alarm conditions. The
total obtained in Table 9 will be used in Table 10 to determine the size of
the batteries needed to support five minutes of alarm operation.
Table 9: Secondary Power Alarm Requirements (@24 VDC)
Device Type
Total Current/Type
IFC-200
0.100
External Devices (Total from Table 6)
Sum Column for Secondary Standby Load
amps
Table 10 sums the standby and alarm loads to arrive at the battery size, in
ampere hours, needed to support the IFC-200. There is a specific range of
batteries that can be charged properly. Select batteries that meet or exceed
the total amp hours calculated and are within the acceptable charger range
of 7 to 17* amp-hours. Acceptable batteries with NR45-24 external
battery charger are 20 to 55 amp-hours. Write amp-hour requirements on
the Protected Premises label located inside the door of the unit.
*
A UL Listed external battery cabinet is required for 15 to 17 AH
batteries. Refer to the Optional Devices section of the IFC-200
System Description Technical Bulletin in this manual.
Standby Current
Load on Batteries
Four-Wire
Detectors
Alarm Current
Load on Batteries
Calculating
Necessary
Battery Size
