In addition to smoke detectors outside of the sleeping areas, the installation of a smoke detector on each additional story of the family living unit, including the basement, is required. The 500 Series 2-wire smoke detectors have a DIP switch that allows the installer to choose between 12/24V operation and 6/12V operation. Selectable voltage range for UL 2-wire compatibility See the 505 module installation instructions for more information. Each 505 module will accommodate up to 20 ESL 521/ 528 Series smoke detectors. The 521/528 Series is UL Listed as compatible with the 505 module and will be fully UL compliant with any UL listed 24 VDC control panel and panels that do not operate below 12V. The ESL 505 module can convert the 2-wire 521/528 Series to a 4- wire input on the control panel. Using the 2-wire 521/528 Series with a panel that does not have 2- wire capabilities The detectors automatically adjust sensitivity, up to a maximum of 1.0%/ft., as the detectors become dirty. This meets NFPA 72 field sensitivity testing requirements without the need for external meters. Once a day and immediately upon first power up, each 500 Series detector performs a full diagnostic test that includes a dynamic test of the sensing chamber and internal electronics. In family living units with more than one bedroom area or with bedrooms on more than one floor, more than one smoke detector is required, as shown in Figure 2 B. In units with only one bedroom area on one floor, the smoke detector(s) should be located as shown in Figure 2 A. Therefore, a smoke detector(s) is best located between the bedroom areas and the rest of the unit. The principal threat to persons in sleeping areas comes from fires in the remainder of the unit. The major threat from fire in a family living unit occurs at night when everyone is asleep. This equipment should be installed in accordance with the National Fire Protection Association’s (NFPA) Standard 72.Ī-8-1.2.1.a Where to Locate the Required Smoke Detectors in Existing Construction. Selecting a suitable location is critical to the operation of smoke detectors. If you have questions, call Interlogix at 1-80.

Interlogix cannot provide technical support to unqualified persons.

This document is intended for licensed electricians/ alarm installers. Remember, 4-wire smoke detectors do not require a For a copy of the Compatibility Index, call 1-80 or visit for a copy to down load.

Please refer to the ESL Compatibility Index for a complete listing of control panels and proper identifiers.

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