ESL 405 polarity reversal modules are designed for use with ESL smoke detectors that have built-in sounders. On alarm, the module disconnects the detectors from their normal power supply and applies reverse polarity from the notification appliance circuit. Applying reverse polarity causes the sounders on detectors not in alarm to activate.
Use the following guidelines to determine the appropriate application of the relay modules:
- For 2-wire applications, DO NOT connect pull stations, heat detectors or other shorting devices.
- Use a single reversal module for 4-wire applications.
- For 2-wire applications, use one reversal module for each initiating circuit.