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INS

T

R,INS

T

,TS

D

-90A

Linear P

/N: 208449 G

Material: 20 Lb. Mead B

ond

Ink: B

lack

S

ize: 8.500" x 11.000"

Front S

ide 1 of 2

S

c

ale: 1-1

TSD-90A

SUPERVISED
DIGITAL SMOKE
ALARM

Installation Instructions

(760) 438-7000 

G

 FAX (760) 438-7043

USA & Canada (800) 421-1587 & (800) 392-0123

Toll Free FAX (800) 468-1340

www.linearcorp.com

DESCRIPTION

T h e   T S D - 9 0 A   i s   a   h i g h   q u a l i t y ,

photoelectric smoke alarm with a built-in supervised
digitally-coded radio transmitter. The TSD-90A is supervised
to monitor alarms, restorals, low battery, status, tamper, and
test conditions. 

The TSD-90A transmitter is compatible

with any Linear SX format supervised security receiver.

The TSD-90A sounds a local alarm as soon as smoke is
detected. Twenty seconds after the local alarm sounds, the
TSD-90A’s transmitter will send an alarm signal to the
supervised receiver. The alarm signal will be repeated every
20 seconds as long as smoke is still present. A restoral report
will be sent when the smoke detection chamber clears.

Supervisory status reports are sent from the TSD-90A every
hour.

Coding switches are not required or used in the TSD-90A.
Each transmitter is pre-coded at the factory to a unique code.
With the SX format, there are more than sixteen million codes
possible.

The smoke alarm and transmitter are powered by two 9-volt
batteries. These batteries are supplied with the transmitter
and can power the unit for up to two years. If the battery
voltage drops below a preset level, a low battery report is sent
to the receiver with any status, alarm, tamper or test
transmission.

NOTE: After replacing batteries, press transmitter test button
to reset “low battery circuit”.

STEP 1

Remove mounting plate.

 Remove the TSD-90A

mounting plate by turning the plate counterclockwise.

STEP 2

Identify components.

 Examine the TSD-90A to

identify the component locations.

STEP 3

Install batteries.

 Connect the two 9-volt batteries

and place them into battery holding cups.

STEP 4

Pick smoke alarm location.

 Referring to the

NFPA standard on the back of this sheet, select a good
location to mount the TSD-90A. 

Mounting the TSD-90A on

foil-backed wallpaper or on a 

metal

 single-gang electrical

box is not recommended because the radio range will be
reduced.

STEP 5

Install mounting plate.

 Use the two screws and

anchors provided to attach the mounting plate to the wall or
ceiling. Alternately, the mounting plate can be attached to a

plastic

 single-gang electrical outlet box. For the best radio range,

observe the “best signal” label on the bottom of the unit.

STEP 6

Program TSD-90A into receiver and test.

 Follow

the receiver’s instructions to set it in a program or learn mode.
Press the TSD-90A’s 

transmitter

 test button (not the smoke

alarm’s test button) to send a test signal. The transmit LED
should light. Verify that the signal was received and that the
transmitter was properly entered into the receiver’s memory.

TWIST MOUNTING
PLATE TO
UNLOCK

REMOVE 
MOUNTING
PLATE

BATTERY
COMPARTMENTS

TRANSMITTER
BOARD

TRANSMIT LED

TRANSMITTER
TEST BUTTON

D I N I N G

K I T C H E N

B E D R O O M

B E D R O O M

B E D R O O M

L I V I N G

R O O M

S M O K E

A L A R M

PLASTIC
SINGLE-GANG
ELECTRICAL
BOX

SCREW
ANCHORS
FOR WALLBOARD

OR

PRESS TEST
BUTTON

SX

FORMAT!

CONNECT AND
INSTALL TWO
9-VOLT DURACELL
MN1604 ALKALINE
OR TWO ULTRALIFE U9VL
LITHIUM BATTERIES (BOTH
MUST BE THE SAME TYPE)

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