System Sensor Interconnecting More than 10 Innovair 4-wire Conventional Duct Smoke Detectors

Technical Field Bulletin 6 02 1 04 users of System Sensor Innovair 4 wire duct smoke detectors Application Engineers more than 10 Innovair 4 wire conventional duct smoke detectors duct detectors are interconnected an alarm condition in one detector activates the auxiliary relay contacts in all of the units System Sensor installation manuals specify a maximum of 10 interconnected devices Using the method below it is possible to interconnect additional detectors first step is to verify that the total current drawn from any one detector will not exceed its maximum allowable value The current load is calculated by combining all currents drawn from Terminals 19 Auxiliary Power 15 Alarm Signal and Interconnect For each detector in the system start by adding up the currents drawn by its accessories Currents drawn by System accessories are listed in Table 1 Add in any other loads including current drawn from Terminal 15 during alarm Multiply the of detectors to be interconnected by the current listed for Interconnected Detector in Table 1 and add this result to the The total current drawn from any one detector in the system must not exceed the maximum limits shown at the bottom of 1 Current mA OR RTS451KEY Accessories 15 Alarm Current Interconnected Detector Current When Powered From an AC Supply 120 or 220 VAC Current When Powered From 24 VDC Ripple Must Not Exceed 4 Volts at Full Load 1 Defined Defined mA mA second step is to furnish and install a rectifier 1A 200 PIV minimum such as 1N4003 between Terminals 12 and 15 of every detector Trim the leads of the rectifiers to an appropriate length and be sure to observe the polarity shown in Figure 1 all remaining wiring for the system in accordance with the Installation Manual 1 you have any questions concerning System Sensor products or their application contact Technical Services at 1 800 SENSOR2 736 7672 extension 2 Ohio Avenue St Charles IL 60174 Phone 800 736 7672 Fax 630 377 6583 www systemsensor com