MODEL 5204 - Silent Knight

Model 5204 Fire Control/Communicator Installation ManualA4.2.2 Worksheet RequirementsThe following steps must be taken when determining 5204 current ratings:1. For the Model 5204, you must measure the alarm (active) current. If only one current ratingis listed, the draw for that device is the same whether the system is in alarm or standbycondition. The exception is for notification devices, which are rated at alarm current only.Standby current for sounding devices is 0 mA.2. To measure the maximum alarm current of the panel, measure the current draw (with nodevices connected to the panel) by connecting a DC amp meter in series with one of thebatteries. Disconnect the AC power source. Put the panel in alarm. The meter will indicatethe alarm current, which will be in the range of 120-400 mA. Fill in the system alarmcurrent in the Current per Device column on the Current Draw worksheet. You can estimatewithout measuring the alarm current by filling in the maximum total alarm current of400 mA.Note: In a 12-volt system, measure the current from both batteries (disconnect both grounds).3. For smoke detectors, notification devices and devices not mentioned in the manual, referto the device manual for the current ratings. The worksheet example shown on the previouspage provides rough estimates for a “worst case” installation.4. Use Table 4-1 to determine the battery amp hour rating needed for your installation. Referto the example (Figure 4-3) that follows. Note that the calculated rating in Row H cannotexceed the ratings shown in Table 4-2).BTable 4-1: Battery CalculationsTotal supervisory current from the Current Draw worksheet(row E).Number of standby hours (24 and 60 for NFPA 72, Chapter1, 1-5.2.5).Total Standby CurrentC Multiply Lines A and B. AHAHTotal Alarm CurrentD Total alarm current from the Current Draw worksheet (rowE).AE Alarm sounding period in hours.(For example, 5 minutes = .084 hours.)HF Multiply lines D and E. AHG Add lines C and F. AHH Multiply line G by 1.2.(Total ampere/hours required*)AH* Use next size battery with capacity greater than required.4-4 150644