Digital Security Controls Ltd. 09WT4901 User Manual

Use this installation sheet along with the associated alarm system installation

manual. All instructions specified within that manual must be observed.
The WT4901 is a two-way wireless indoor siren. It sounds an alarm condition

received via DSC wireless protocol from a compatible, two-way enabled security

panel (e.g., PC9155). After the WT4901 is enrolled on the security panel, it is

capable of receiving commands from the panel for sounding alarms and com-

municating any required response, such as system status. The siren is capable of

sounding different alarm cadences (e.g., continuous burglary, pulsating fire

(used in Canada), or temporal three fire (used in USA)), bell squawks, and

buzzer tones to suit the type of command it receives. 
The WT4901 provides a supervisory signal to the security panel, to ensure

that its wireless communication capability is currently functioning. In addi-

tion, it monitors the case and wall tamper switch states, and the battery

state. In the event of a low battery or a tamper activation, the WT4901 trans-

mits the appropriate signal to the security panel and, if applicable, provides

an audible indication that a system event has occurred. Multiple WT4901

can be enrolled on, and supervised by the same security panel as separate

units.

Specifications
• Operating Temperature: -10°C to +55°C (14°F to 131°F)

Temperature range for UL/ULC: 0°C to +49°C

• Relative Humidity: 0 to 93% R.H., non-condensing

• Operating Frequency: 433.92MHz

• Wireless Range: 250m (outdoor, line of sight)

• 

Batteries: (4) AA 1.5V Alkaline (Energizer

 E91

)

• Battery Life: 2 years (under typical use)

• Low Battery Level: {xx V pre-determined}

•

Output Level: 85dB 

@ 

3m(high volume)/65db 

@ 

3m(medium volume)

 WT4901

 Installation Sheet

 Hardware pack: 3 screws and 3 plastic anchors

 4 AA Batteries

The WT4901 serial number is only used when the indoor siren is enrolled and pow-
ered up. Enrolling the WT4901 permits it to communicate with the control panel.
The installer can activate the indoor siren by Quick Enrollment or Serial Number
Programming, see below.

1. Enter the enrollment mode through installer programming, see section [898] in

the alarm system installation manual.

2. Power up the indoor siren, if it is not already powered up.

3. Tamper the indoor siren using the tamper switch.
4. The indoor siren sends a request to the security panel to enroll on the system.
5. The Keypad displays the electronic serial number which must be confirmed by

keying in [*]. If the electronic serial number is incorrect, press [#] and repeat
this step.

6. Select the module number that the device should be enrolled as.

located on a sticker on the wireless device.
7. Repeat starting from step 2. to enroll each additional indoor siren.

1. Enter the enrollment mode through installer programming, see section [804] in

the alarm system installation manual.

2. Select the module number that the device will be enrolled as. See sections [301]-

[304] for sirens.

3. Enter the serial number using either the Keypad, or DLS.

Perform a placement test to ensure there is sufficient signal strength for proper com-
munication between the security panel and the siren location.
1. Place the security panel into placement test, see section [906].
2. Start the test by tampering  and  restoring the siren being tested, or pressing and

holding the Test button for 2 seconds (the siren will give a beep).

3. The siren will respond with one beep if the location is “Good” or three beeps if the

siren is at a “Bad” location.

The indoor siren is mounted to a flat surface such as drywall, or any variety of other
surfaces with the supplied hardware. 

NOTE: Do not mount over a single gang electrical box.
1. Open the WT4901 by inserting a screwdriver into the slots and gently pry on the

front cover until it separates from the backplate.

2. If the batteries are not installed, install the batteries as shown in the sequence

indicated by the engraving.

3. Position the backplate on a flat mounting surface and mark this location.
4. Secure the backplate to the mounting surface with all the screws provided.
5. Hinge the front cover to the backplate carefully, to correctly align it with the

tamper switch, then snap it onto the backplate. The wall tamper switch must
remain closed when the indoor siren is mounted.

The test button activates the local siren for 4 seconds. Press and hold the siren test

button, located at the front of the WT4901, to verify the indoor siren is functioning.

If it is, the siren will sound at medium volume for 2 seconds, followed by 2 seconds

at full volume. The WT4901 does not necessarily have to be enrolled on a system to

perform this test.

The security panel will indicate when the batteries are low and require replacement. 
Only Energizer E911.5V AA alkaline batteries can be used. 

THE TYPE RECOMMENDED BY THE MANUFACTURER. Open the front cover and
install the batteries as shown in the sequence indicated by the engraving. If the batteries are
installed incorrectly, in the reverse polarity, the indoor siren will not work. Under typical use
the WT4901 is capable of operating on battery power alone without having to change the
batteries for a minimum period of two years. Do not try to recharge these batter-
ies. Disposal of used batteries must be made in accordance with the
waste recovery and recycling regulations in your area.

If necessary, WT4901 options can be setup to suit desired system responses. By
means of the keypad interface, the installer has access to the siren programming
menus supported by the main panel e.g., wireless sounder options (see table
below), siren enrollment and placement test activation menu.

Installation Instructions

Siren #

Serial Number

[301]#1
[302]#2
[303]#3
[304]#4

Program Section

Options

Sounder:

Siren#1[311]
Siren#2[312]
Siren#3[313]
Siren#4[314]

1. Siren Enabled
2. Buzzer Notification 

Enabled

3. Door Chime Enabled
4. Trouble Beeps Enabled
5. Bell Squawks Enabled
6. Enable Strobe 

(WT4911 only)

7. Buzzer Alarms follow 

BTO

8. For Future Use

1. Siren Disabled
2. Buzzer Notification Dis-

abled

3. Door Chime Disabled
4. Trouble Beeps Disabled
5. Bell Squawks Disabled
6. Disable Strobe 

(WT4911 only)

7. Buzzer Alarms follows 

Alarm Condition

8. For Future Use

Global Sounder:

Sirens#1-4 

[320]

1. Tamper Activates Siren/

Strobe

2. Pre-Alarm Signal 

Enabled

3. to 

8. For Future Use

1. Tamper does not Acti-

vate Siren/Strobe

2. Pre-Alarm Signal Dis-

abled

3. to 

8. For Future Use

Test 
Button

Buzzer

9035

Mounting
Holes (2)

Mounting Hole

Battery (4) AA
1.5V Alkaline

Test Button

Slots for removing
front cover

9036

Indoor Siren Front Cover

Indoor Siren Backplate

I