Installation guide

Bosch Security Systems | 11/03 | 39352E
EN | 58
D9124 | Operation & Installation Guide |
A.1.2 24 VDC Device Calculations
A.2 Standby Battery Calculations for Fire
Alarm Applications
Calculate Standby Battery and Auxiliary
Current first. You must calculate totals for
columns B and C in the appropriate (12 V or
24 V devices) chart in
Section A.1 Auxiliary
Current and Standby Battery Requirements
before you can complete the following
calculations.
A.2.1 Calculations for D9412GLTB and 12 VDC
Initiating and Indicating Devices
Central Station or Local Systems (24-Hour Standby)
Central station or local systems require 24 hours of
standby plus 5 minutes of alarm operation at the end of
the 24-hour period. A single battery is sometimes
adequate for central station systems, but you must install
two batteries to meet the basic standby requirements for
a local system installation. You must use battery ampere
hour (Ah) calculations to verify compliance. The
formula in Figure 27 includes the calculation for
5 minutes of alarm operation at the end of the 24-hour
period, and a 10% contingency factor allowing for the
depletion of battery capacity with age.
Remote Station or Auxiliary Systems
(60-Hour Standby)
Remote station or auxiliary systems require 60 hours of
standby plus 5 minutes of alarm operation at the end of
the 60-hour period. A UL Listed power supply with
additional batteries installed in a separate D9109 or
D9109G enclosure may be required in the D9124 System
to meet the basic standby requirements for a remote
station or auxiliary system installation. You must use
battery ampere hour (Ah) calculations to verify
compliance. The formula in Figure 28 includes the
calculation for 5 minutes of alarm operation at the end
of the 60-hour period, as well as a 10% contingency
factor allowing for depletion of battery capacity with
age.
Ampere-Hour Calculation Formulas
Use totals from Section A.1.1 Calculations for 12 VDC
Devices (currents in millamperes).
The total Ah requirements must not exceed the Ah
capacity of:
Two D126 Batteries = 14 Ah (14000 mAh)
Two D1218 Batteries = 34.4 Ah (34400 mAh) if using
17.2 Ah batteries and 36 Ah (36000 mAh) if using 18
Ah batteries
Appendix A: Determining Battery Requirements
AC Power ON AC Power OFF In Alarm
Model
Number
Quantity
Used
Normal Current
(each unit)
A
Total
Minimum Current
(each unit)
B
Total
Maximum Current
(each unit)
C
Total
(mA x Quantity) (mA x Quantity) (mA x Quantity)
x Quantity = x Quantity = x Quantity =
x Quantity = x Quantity = x Quantity =
x Quantity = x Quantity = x Quantity =
x Quantity = x Quantity = x Quantity =
x Quantity = x Quantity = x Quantity =
x Quantity = x Quantity = x Quantity =
x Quantity = x Quantity = x Quantity =
x Quantity = x Quantity = x Quantity =
A Total = B Total = C Total
*
=
Table 25: Determining Battery Requirements for 24 VDC Devices
*
C Total must not be greater than 4.0 A (4000 mA).
When connecting two D1218 Batteries to
the control panel, both must have the same
capacity (use two 17.2 Ah batteries or two
18 Ah batteries).