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10.17.12 05362H © Inovonics, 2012 - www.inovonics.com

EN1242 EchoStream

®

 Smoke Detector 

Transmitter

Installation Instructions

1 Overview

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: 

The EN1242 smoke detector transmitter is intended for use as a 

supplemental residential fire alarm device, and is only UL listed to provide 
localized functional annunciation.

1.1 Inovonics Wireless Contact Information

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

• E-mail: [email protected]
• Phone: (800) 782-2709; (303) 939-9336

1.2 EN1242 External Components

 Figure 1  

EN1242 external components

Status LED: The LED indicates the status of the sensor as follows:

• LED flashes every 8 seconds to indicate normal operation.
• LED stays on when the sensor detects smoke, and is sending an 

alarm. 

• LED stays off when maintenance is required.

Test/silence button: Test/silence is pressed to perform the sensitivity test, 
as well as to silence the low battery chirp. The low battery chirp will resume 
after 24 hours if the condition is not corrected. 

1.3 EN1242 Internal Components

 Figure 2  

EN1242 internal components

1.4 What’s In The Carton

• Two BAT604 Duracell DL123A lithium batteries 
• Two drywall anchors
• Two mounting screws
• Two frequency band selection jumpers

2 Installation and Startup

2.1 Installation Notes

• These products are designed to be maintained by professional 

security technicians

• Products are tested for indoor use
• All products should be manually tested weekly

2.2 Install Batteries

1.

Turn the sensor housing counterclockwise fifteen degrees and detach it 
from the mounting base.

2.

Remove the battery compartment cover.

 Figure 3  

Remove the EN1242 battery compartment cover

3.

Install the two three-volt batteries. 

4.

Replace the battery compartment cover

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.

2.3 Open the Housing

5.

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

6.

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

A

LED

B

Test/silence button

A

Low battery/CleanMe 
selection pins

B

 Frequency band 
selection pins

C

Reset button

B

A

A

B

C

Battery 
Compartment 
Cover

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