Inovonics Wireless Corporation 3B6OT9ESL Manuel D’Utilisation

© Inovonics, 2009 - www.inovonics.com

Installation Instructions - 05362F

The EN1242 smoke detector is a wireless, battery powered photoelectric 

smoke sensor. The sensor includes a built-in sounder for alarm alerts, a 

visual status LED, and an Inovonics Wireless EchoStream transmitter. The 

sensor works as part of a security/fire alarm system and communicates 

with the system control panel. Under normal (non-alarm) conditions, the 

LED flashes once every eight seconds while the sensor monitors the 

surrounding conditions. When the sensor detects smoke, the LED lights, 

the built-in sounder beeps loudly, and an alarm signal is transmitted. The 

smoke sensor is powered by the two included three-volt lithium batteries. 

When the EN1242 detects an inactive smoke sensor a tamper message 

will be transmitted.
Note: For UL installations, refer to the EN4216R Installation and Operation 

Manual or the EN7285 Installation Instructions.

If you have any problems with this procedure, contact Inovonics Wireless 

technical services:

• E-mail: support@inovonics.com

• Phone: (800) 782-2709; (303) 939-9336

 Figure 1  EN1242 Components

 Figure 2  EN1242 Features

1. Turn the sensor housing counterclockwise 15 degrees and detach it 

from the mounting base.

2. Remove the battery compartment cover.

 Figure 3  EN1242 Battery Compartment Cover

3. Install/replace the two three-volt batteries. 
Note: A tamper message will transmit for approximately ten seconds while 

the unit powers up after the installation of both batteries. If only one battery 

is installed, the tamper message will transmit continuously.

1. Using a small screwdriver to press the sensor cap release tab, apply 

downward pressure and turn the cap about one inch counter-clockwise 

to remove the cap..

 Figure 4  Remove the Sensor Cap

2. Place both thumbs on either side of the optical chamber and push down 

to detach the sensor housing.

 Figure 5  Push Down on the Optical Chamber

EchoStream products are able to use a range of radio frequencies, and 

must be configured for your geographic area. To configure the transmitter:
1. Place a selection jumper on the appropriate frequency band selection 

pins.

• Place the jumper on the left two pins, marked AU, to set the frequency 

range to 915-928 MHz for Australia.

• Place the jumper on the right two pins, marked NZ, to set the 

frequency range to 921-928 MHz for New Zealand.

• Leave the jumper off the pins to set the frequency range to 902-928 

MHz for North America.

2. Press the Reset button to complete configuration.
Caution: When pressing the Reset button, make sure you don’t also touch 

the frequency band selection pins. Touching the frequency band selection 

pins while pressing the Reset button can inadvertently set the device to the 

wrong frequency band.

A Low Battery/Clean Me 

Selection Pins

B  Frequency Band 

Selection Pins

C Reset Button

A Sounder Vent B LED

C Test/Silence 

Button