Honeywell 25/50ZS Manuel D’Utilisation

100

Audio Command Center Series Manual — P/N 51889:E1  6/8/2010

Power Supply Calculations

Use Table 6.3  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 ACC-25/50 Series under the loss of AC 
power.  Complete Table 6.3 as follows:

1. Enter the totals from Table 6.2 on page 99 Calculation Columns 1 and 2 where shown.
2. Enter the NFPA Standby and Alarm times (refer to Section 6.4.1,  ”NFPA Battery 

3. Calculate the ampere hours for Standby and Alarm, then sum the Standby and Alarm ampere 

hours.

4. Multiply the sum by the derating factor of 1.2 to get the proper battery size (in AH).
5. Write the ampere hour requirements on the Protected Premises label located inside the cabinet 

door.    

NFPA requires 24 hours of standby plus 15 minutes activation for audio systems.  The total ampere 
hours required cannot exceed 18 AH with an internal charger.  An external charger can be used to 
increase the total ampere hours (internal charger must be disabled).

Select batteries that meet or exceed the total ampere hours calculated in Table 6.3.  The audio panel 
can charge batteries in the 7 AH to 18 AH range.  The ACC-25/50 Series can house up to 18 AH 
batteries.  

Secondary Standby Load 
(total from Table 6.2  Calculation Column 1)
[                    ]

Required Standby Time
(24 or 60 hours)
[                    ]

=                        AH

Secondary Alarm Load
(total from Table 6.2  Calculation Column 2)

[                    ]

Required Alarm Time
(for 5 min., enter 0.084,
for 10 min., enter 0.168,
for 15 min., enter 0.250)
[                    ]

=                       AH

Sum of Standby and Alarm Ampere Hours

=                       AH

Multiply by the Derating Factor

             X 1.2

Battery Size, Total Ampere Hours Required

=                      AH