Calculating The Battery Size - Honeywell Notifier SFP-2402 Instruction Manual

Power Supply Calculations
Table 5.3 contains three columns for calculating current draws. For each column, calculate the
current and enter the total (in amperes) in the bottom row. When finished, copy the totals from
Calculation Column 2 and Calculation Column 3 to Table 5.4 on page 47.
Calculation Column 1
Device Type Primary, Non-Fire Alarm Current
Qty
Main Circuit Board 1
SFP-2402
or
SFP-2404
CAC-4 [
4XTM [
4XZM [
4XLM/RZA-4X pair [
1 pair max.
2-wire Detector [
Heads
4-wire Detector [
Heads
Power Supervision [
**
Relays
††
NAC #1
NAC #2
Current Draw from
‡‡
TB1 (nonalarm )
Sum each
***
column for totals
* If using the Reverse Polarity Alarm output, add 0.005 amps; if using the Reverse Polarity Trouble output, add
another 0.005 amps.
† Refer to the Device Compatibility Document for standby current.
‡ Refer to the Device Compatibility Document for standby current.
** Must use compatible listed Power Supervision Relay.
†† Current limitation of Terminal TB2 circuits is 2.50 amps per NAC (SFP-2404 requires optional transformer for
max. current)
‡‡ The total standby current must include both the resettable (TB1 Terminals 3 & 4) and nonresettable for SFP-
2404 only (TB1 Terminals 1 & 2) power. Caution must be taken to ensure that current drawn from these
outputs during alarm does not exceed maximum ratings specified. Current limitations of TB1, Terminals 1 & 2 =
0.500 amps, filtered, 24 VDC +/-5%, 120 Hz ripple @ 10 mV
4 = 0.500 amps, filtered, 24 VDC +/-5%, 120 Hz ripple @ 10mV
*** Total current draw listed above cannot exceed 3.0 amps with only standard transformer installed or, for the
SFP-2404, 6.0 amps with both the standard and optional transformers installed.

5.4 Calculating the Battery Size

Use Table 5.4 to calculate the total Standby and Alarm load in ampere hours (AH). This total load
determines the battery size (in AH), required to support the control panel under the loss of AC
power. Complete Table 5.4 as follows:
46
(amps)
X[current
Total
draw]=
0.
X[0.080]=
X[0.085]=
] X[0.001]=
] X[0.005]=
] X[0.004]=
] X[0.004]=
†
] X[ ] =
‡
] X[ ] =
] X[0.025]=
[ ]=
Primary Non-Alarm =
Table 5.3 System Current Draw Calculations
Calculation Column 2
Primary, Fire Alarm Current
(amps)
X [current draw]
Qty Total
=
1
*
X[0.112] =
*
X[0.175] =
[ ] X[0.001]=
*
[ ] X[0.011] =
[ ] X[0.008]=
[ ] X[0.019]=
[ ] X[ ]=
[ ] X[ ]=
[ ] X[0.025]=
[ ] X[ ]=
[ ] X[ ]=
[ ]=
Primary Alarm =
, nonresettable power and TB1, Terminals 3 &
RMS
, resettable power.
RMS
SFP-2402 & SFP-2404 Series Manual — P/N 51898:F3 8/6/2014
Calculating the Battery Size
Calculation Column 3
Secondary, Non-Fire Alarm
Current
(amps)
X[current
Qty
draw]=
0. 1
X[0.080]=
X[0.085]=
X[0.001]=
X[0.005]=
X[0.004]=
X[0.004]=
X[ ]=
X[ ]=
X[0.025]=
[ ]=
Secondary Alarm =
Total
0.