Installation manual

D9124 Operation & Installation Manual
Page 28
© 1996 Radionics
74-06799-000-D 2/96
System Column Column
Battery or Power Supply
Recommendations
Includes B
TOTAL
C
TOTAL
24 Hour
Standby
Required
60 Hour
Standby
Required
D9124 Only 462mA 874mA (2) D126 (2) D1218
D9124 + command
center
568mA 1080mA (1) D1218 Add power supply and
batteries
D9124 + 63 POPITS 588mA 1063mA (1) D1218 Add power supply and
batteries
D9124 + 63 POPITS +
command center
694mA 1269mA (2) D1218 Add power supply and
batteries
D9124 + 126 POPITS
+ additional D8125
762mA 1299mA (2) D1218 Add power supply and
batteries
D9124 + 126 POPITS
+ additional D8125 +
command center
868mA 1505mA (2) D1218 Add power supply and
batteries
Power Supply
Power for the D9112LTB, Command Center and Modules
Primary Power
The D9112LTB receives 16.5 VAC 40 VA transformer power from connector J9 on the
D9142 Power supply. For information about installing the D1601 Transformer, see
Installing the D1601 Transformer in the Installation section.
Secondary Power
One or two D126 12V, 7Ah or D1218 12V, 17.2Ah sealed lead-acid rechargeable
batteries supply the power for the control/communicator, command centers, and the
modules. The current draw on your system determines the ampere hour capacity of the
batteries you need. See Standby Battery and Current Rating . The batteries also power
these devices during interruptions in primary (AC) power.
Replace batteries every three to five years under normal use. Use only lead-acid
batteries.
Choosing the Right Batteries to Meet 12V Requirements
To determine the correct batteries to connect to the system, you must know the amount
of current that 12V devices draw from the D9112LTB, and the number of hours that the
batteries are supposed to last. Table 8 gives some examples for the impact of adding
12V devices while meeting UL and NFPA requirements for fire detection systems.
The first column shows what’s included in the system. The second and third columns
show you totals from columns B and C in the Auxiliary Current and Standby Battery
Requirements section, Calculations for 12 VDC Devices. The last two columns show
what you need to meet the standby requirement.
Table 8 is only for example purposes, you must perform actual calculations in
Calculations for 12 VDC Devices.
Table 8: Standby Power Requirements for Additional 12V Devices