Honeywell HPF24S8 Installation Instructions - Page 41

Calculating the Battery Size Power Supply Requirements 5. Write the ampere hour requirements on the Protected Premises label located inside the cabinet door. Secondary Standby Load Required Standby Time (total from Table 6.3 (24 or 60 hours) Calculation Column 3) [ ] X [ ] = AH Primary Alarm Load Required Alarm Time (total from Table 6.3 (for 5 min., enter 0.084, Calculation Column 2) for 10 min., enter 0.168) [ ] X [ = AH Sum of Standby and Alarm Ampere Hours = AH For nonULC applications, multiply by the Derating Factor* X 1.2 For ULC applications, multiply by the Derating Factor* X 2.5 Battery Size, Total Ampere Hours Required = AH Table 6.4 Total Secondary Power Requirements at 24 VDC * Multiply by only one of the Derating Factors, depending on whether the power supply is being used for a ULC (Canadian) application or nonULC application. 6.4.1 NFPA Battery Requirements NFPA 72 Local and Proprietary Fire Alarm Systems require 24 hours of standby power followed by 5 minutes in alarm 6.4.2 Selecting and Locating Batteries Select batteries that meet or exceed the total ampere hours calculated in Table 6.4 . The power supply can charge batteries in the 7 AH to 18 AH range. The power supply cabinet is capable of housing batteries up to 7 AH. Batteries larger than 7 AH require the BB-17 or other UL listed external battery cabinet. HPF24S Series Power Supplies - P/N 52751:D3 5/11/2010 41