DSC WS4920 User manual

NOTE: Use these instructions in conjunction with the installation manual of the alarm panel with which this
equipment is intended to be used.
WARNING: READ and SAVE These Instructions! Follow All WARNINGS AND INSTRUCTIONS specified
within this document and/or on the equipment.
WS4920 v1.0
Installation Instructions, Instructions d’installation, Instrucciones de
Instalación, Instruções de Instalação, Istruzioni di installazione

SAFETY INSTRUCTIONS for WS4920 WIRELESS REPEATER
IMPORTANT:
This equipment, WS4920 WIRELESS REPEATER 1.0, shall be installed and used within an
environment that provides the pollution degree max 2 and overvoltages category II NON
HAZARDOUS LOCATIONS, indoor only. The equipment is FIXED and DIRECT PLUG IN powered
from the mains; it is designed to be installed by Service Persons only; Service Person is defined as a
person having the appropriate technical training and experience necessary to be aware of hazards to
which that person may be exposed in performing a task and of measures to minimize the risks to that
person or other persons.
1. The equipment is installed in a FIRE ENCLOSURE.
2. If during the installation a knockout is removed, it is the installer's responsibility to ensure that
the same degree of protection for the enclosure is provided by the use of bushings, fittings, etc.
3. The enclosure must be secured to the building structure before operation.
4. Internal wiring must be routed in a manner that prevents:
• Excessive strain on wire and on terminal connections
• Loosening of terminal and connections
• Damage of conductor insulation
5. The end-user and/or installer are responsible for ensuring that the disposal of the used batteries
(battery pack) is made according to the waste recovery and recycling regulations applicable to
the intended market.
WARNING: When using equipment connected to the MAINS, always follow basic safety instructions.
Refer to the SAFETY INSTRUCTIONS provided with this product; save them for (future) reference.
Instruct the end-user regarding the safety precautions that shall be observed when operating this equipment.
SAFETY precautions required during installation:
• NEVER install this equipment during a lightning storm!
• NEVER touch uninsulated wires or terminals unless the direct plug in transformer has been dis-
connected.
• Ensure that cables are positioned so that accidents cannot occur. Connected cables must NOT be
subject to excessive mechanical strain.
• Use only the power supply provided with this equipment. Use of unauthorized power supplies
may damage the WS4920.
• The AC socket/outlet powering the equipment shall be located near the equipment and shall be
easily accessible.
• Do NOT locate this product where persons will walk on the secondary circuit cable(s).
• Do NOT use extension cords to plug in the power supply of this equipment.
• AVOID setting up the equipment near heaters, air conditioners, ventilators, and/or refrigerators
• Do NOT connect to electrical outlets on the same circuit as large appliances.
• Do NOT select a place exposed to direct sunlight, excessive heat, moisture, vapors, chemicals or
dust.
• Do NOT install this Equipment near water. (e.g., bath tub, wash bowl, kitchen/laundry sink, in a
wet basement, or near swimming pool, etc.).
• Do NOT install this equipment and its accessories in areas where there is a risk of explosion.
• Do NOT connect this equipment to electrical outlets controlled by wall switches or automatic
timers; avoid interference sources.
WARNING: THIS EQUIPMENT HAS NO MAINS ON/OFF SWITCH. THE PLUG OF THE DIRECT
PLUG-IN POWER SUPPLY IS INTENDED TO SERVE AS THE DISCONNECTING DEVICE IF THE
EQUIPMENT MUST BE QUICKLY DISCONNECTED. IT IS IMPERATIVE THAT ACCESS TO THE
MAINS PLUG AND ASSOCIATED MAINS SOCKET/OUTLET IS NEVER OBSTRUCTED.

Table of Contents/ Table des matières/ Índice/ Indice dei contenuti
Installation Instructions.............................................................................................2
Instructions d’installation .......................................................................................10
Instrucciones de Instalación....................................................................................22
Instruções de Instalação ..........................................................................................34
Istruzioni di installazione........................................................................................46
The WS4920 is compatible with the following DSC wireless devices:
NOTE: WS4920 is not compatible with 2-way devices.
Door/ Window Contact Alarm Panel Wireless Receiver
ULWS4945
ULWS4965
WS4975W*
EV-DW4975**
EV-DW4917
WS4925
EV-DW4955
ULPC1616/PC1832/PC1864
ULSCW9045-433
ULSCW9047-433
ULPC9155-433
ULPC4020-433
PC4010-433
SCW9055-57(D)(G)(I)-433
ULRF5132-433
ULRFK5500-433
ULRFK5501-433
ULRFK5508-433
ULRFK5516-433
ULRF4164-433
PC5132-433
RF5108-433
RF5501-433
Motion Detector Wireless Key Smoke Detector
ULWLS914-433
ULWS4904(P)
WS4904M
ULWS4939
WS4949
WS4959
WS4969
WS4979
***ULWS4916
***ULWS4926
Glassbreak Detector CO Detector Hold-Up Alarm
ULWLS912L-433 ***WS4913 WLS928-433
Shock Sensor Flood Sensor Panic Pendant
EV-DW4927
EV-DW4927SS WS4985 ULWS4938
WS4938-2W
UL Only these UL/ULC listed devices are to be used with UL/ULC listed systems.
* Not available in North America, South America and New Zealand.
** Available in North America, South America and New Zealand only.
*** For Residential Fire installations, two WS4920’s must be used.

1
Specifications
• Temperature range: -10°C to +55°C (14°F-131°F)
Note: UL/ULC tested for 0°C to +49°C (32°F to
122°F), 85%R.H.
• Humidity (Max): 5% - 93% R.H. non-condensing
• Battery type: Rechargeable Ni-MH, 4.8V/2.1 AH (UL
Listed as an LPS. Replace battery every 3-5 years)
• Battery backup time: 24 hours
• Battery charging rate: 80% within 24 hours
• Battery charging current: 170mA
• Operating frequency: 433.92 MHz
• Dimensions: H6.96, W4.47, D1.33
in. (H17.68, W11.35, D3.38 cm)
• Weight: .77 lb. (.35kg)
Note: The built-in wall and case
tamper shall be installed and enabled
for UL/ULC Listed Commercial
Burglary applications.
Transformer requirements:
Plug-In Class II power limited transformer (fused)
Primary: 120VAC, 60Hz, 0.2A (UL/ULC listed installations)
230VAC, 50Hz, 0.1A (International Market. Acceptable to the local authorities)
Secondary: 16VAC-18VAC, 20VA
The following plug-in transformers shall be used:
USA: PTD1620U, UL, CC5, efficiency level IV, 16.5V, 20VA
(UL listed installations)
Canada: PTD1620N, C-UL certified, 16.5V 20VA (ULC listed installations)
Europe: PTD1620T-EU, CE approved 230V/16.5V 20VA
Maximum allowed wire run distances:
Only UL listed devices can be used in UL Commercial Burg listed installations: WS4904(P),
WS4945CB , WLS912L-433, WS4939. The repeater shall be used in conjunction with
Wireless Repeater Model RF5132-433 and Alarm Control Panel models: PC1864, PC1832 or
PC1616. WS4920 is UL listed for Residential Fire, Residential Burglary and Commercial
Burglary applications in accordance with the following standards:
• UL985 Household Fire Warning System Units
• UL1023 Household Burglar-Alarm System Units
• UL1610 Central Station Burglar-Alarm Units
AWG Feet Meters
24* 5.8 1.8
22 9.3 2.8
20 14.8 4.5
18 23.5 7.2
* Not to be used for UL
listed Installations

2
The WS4920 is a wireless repeater designed to extend the range of DSC one-way wireless
transmitters and to improve signal quality between the transmitter and receiver. Use the WS4920 to
remedy transmission problems caused by excessive noise or other interference, or by long distances
between devices and receivers. The maximum recommended number of WS4920’s per alarm
system is 4.
Each enrolled WS4920 occupies a zone slot. The WS4920 does not increase the number of
supported wireless zones. This is determined by the control panel’s wireless receiver. Only zones
requiring repeat functionality need to be enrolled on the WS4920. Ensure these zones are enrolled on
both the WS4920 and the receiver/control panel.
Unpacking
Ensure your package includes the following:
Controls and Indicators
Table 1: LED Definitions
Introduction
• One WS4920 (rechargeable Ni-MH battery included)
• One direct plug-in transformer (Not included in all configurations)
• Mounting hardware pack, including plastic wall plugs and screws
• Installation instructions
The WS4920 has three LEDs on the front. The
meaning of these LEDs is different when in
normal operational mode (cover on) than when
in Installer mode (cover off). See the table
below for descriptions of LED functionality.
The wall tamper must be closed for the LEDs
to operate.
Figure 1: LED Indicators
LED Normal Mode (cover on) LED Installer Mode (cover off)
Green On: AC present
Flashing: No AC, battery good
Off: No AC and dead battery
Green 1 flash: Enrolled
Flashing: Placement test active
Red On: Battery not connected
Off: Battery good (if AC on)
Flashing: Low battery
Red Flashing: Zone not enrolled
Yellow On: RF jam present
Off: No RF jam Yellow On: Repeater placement test “bad” Off: Repeater placement test “good”
Flashing: Sporadic interference or valid
transmission packets detected
Green Yellow
Red
XX

3
Install the WS4920 in the following order.
NOTE: When enrolling and placement testing the WS4920 with the alarm panel, refer to the
compatible control panel installation instructions for the appropriate programming sections.
Step 1: Temporarily Mounting the WS4920
Select a suitable location for the WS4920. Use the following list as a guide:
• Locate device near a power outlet
• Location should be free from vibration and shock
• Mount on a flat, stable surface
• Ideal location is mid-way between the wireless transmitter and receiver. The minimum distance
between the WS4920 and the receiver should be no less than 1 meter (3.28 feet)
Do not permanently mount the WS4920 until it has been placement tested. Temporarily
mount the unit using tape or other non-permanent, non-marking method. If the selected
location fails the placement test, the device must be repositioned.
Step 2: Connecting Power
Connect back-up battery first then AC.
To connect the battery:
1. Gently open front cover using small slotted screwdriver in holes provided (see Figure 3).
The WS4920 includes a Programming button
used to place it into Enroll/Placement modes.
A 4-position DIP switch is also provided to set
the following options:
The default for all switches is ON.
* RF Jam notification required for UL
Residential Fire operation.
Figure 2: Internal Controls
Installation
Table 2: DIP Switch Settings
Switch ON OFF
1 Wall tamper enabled Wall tamper
disabled
2 RF Jam notification
not sent to receiver RF Jam notification sent
to receiver*
3 Compatible with
RF4164, RF5108,
RF5132, RFK55xx,
SCW 9045/47, and
ALEXOR PC9155
receivers
Compatible with
IMPASSA
SCW9055/
SCW9057
4 For installations
with 1 WS4920 For installations with Multiple
WS4920’s
Programming
Button
X
DIP Switch

4
2. Attach battery cable to connector on PC board.
Depending on the charge state of the battery, a low battery trouble condition may be registered
on initial power up. The trouble may take several hours to clear.
To connect the AC adaptor:
1. Run AC wire through channel on back of WS4920 and pass through hole in enclosure.
2. Connect AC wires to terminals on PC board (see Figure 4).
3. Route wire around retaining bracket to secure.
4. Plug AC adaptor into wall outlet.
Figure 3: Removing the Cover Figure 4: Power Connections
Figure 5: Wire Routing
AC
Terminals
Battery
Connector

5
Step 3: WS4920 Repeater Placement Testing (Interference
Detection)
Repeater placement test ensures the WS4920 is located in an area with low noise and
interference and can successfully receive signals from one-way wireless devices.
To perform a Repeater placement test:
1. Press and hold Programming button for 1 second to enter Programming mode. The “Mode
Entered” tone sounds (1 long beep). Repeater placement test is continuously active until
Programming mode is exited, times out after 4 hours or cover is put back on unit.
2. If RF traffic level or noise floor level is too high, the yellow LED lights steadily. If this occurs,
reposition unit until yellow LED turns off.
3. To exit Enroll/Placement mode, press Programming button again for 1 second or place cover
back on WS4920. The “Mode Exited” (3 beeps) tone sounds.
Step 4: Enrolling the WS4920 with the Alarm Panel
The WS4920 has a six-digit electronic serial number (ESN) that must be input to the alarm
panel during enrollment.
To quick enroll the WS4920 (available on selected alarm panels):
1. Enter Wireless Enrollment mode on alarm panel (see panel installation instructions).
2. Tamper WS4920 to transmit ESN.
3. Confirm ESN on alarm panel. Panel prompts for zone number.
4. Select and accept zone number for WS4920 to complete enrollment.
To manually enroll WS4920, consult alarm panel installation manual.
NOTE: For PowerSeries, Alexor, MAXSYS and SCW9045/47, use the serial number beginning with
“2”. For the Impassa (SCW9055/SCW9057) use the serial number beginning with “A”.
NOTE: (For non-UL listed installations) Non-alarm zone type 26 is recommended. With this zone
type, loss of AC or a low battery condition are not reported to the central station. The alarm panel does
not show a trouble for the zone but will indicate it as open. Select the Force Arm attribute for this
zone. Program a zone label to identify the WS4920. e.g.,“Rpter 1 Pwr Trbl.”
NOTE: (For UL listed installations) If AC loss and low battery must be reported to the central station,
use a 24-hour zone type. Ensure the Audible attribute is set to silent.
Step 5: Placement Testing the WS4920
For optimal performance between the WS4920 and the alarm panel, the RF signal between the
two units should be as free from interference as possible.
To test the RF link between the WS4920 and the alarm panel:
1. Place alarm panel into placement test (see panel installation instructions) and select zone
where WS4920 is enrolled.
2. Tamper the WS4920.
• If alarm panel receives a strong signal, panel siren squawks once and “Location is Good” is dis-
played on alarm keypad.
• If alarm panel receives a weak signal, panel siren squawks three times and “Location is Bad” is
displayed on alarm keypad.
3. If alarm system indicates a weak signal or no response, check panel programming or reposition
WS4920 and repeat test. WS4920 should only be placed in location where multiple good results
are received.

6
Step 6: Quick Enroll/Placement Testing Devices
Up to 164 1-way wireless devices can be enrolled on the WS4920. During the first 4 hours of power
up, the WS4920 can be placed into Enroll/Placement Test modes. After the 4 hour time-out, access
to these modes is denied and the unit must be powered up again to enter Enroll/Placement mode.
NOTE: DLS cannot be used to enroll wireless devices on the WS4920. All wireless devices being
enrolled on the WS4920 must also be enrolled on the receiver/control panel.
To both enroll and placement test a device at the same time:
1. Press and hold Programming button for 1 second. “Mode Entered” tone (1 long beep) sounds.
The WS4920 is now in Enroll/Programming mode.
2. Trip and restore zone to be enrolled 3 times:
• Door and window contact - open/close or tamper/restore
• PIR and other stationary devices - tamper/restore
• Panic pendant - 3 to 4 button presses
• Wireless key - 3 separate button presses
3. Red LED (X) flashes until zone is enrolled. Once WS4920 has received signal from zone, Green
LED ( ) lights for 1 second and sounder emits “Zone Enrolled” (low to high) tone.
NOTE:
• If another zone is tripped during the enroll sequence, the enroll process must be restarted by trip-
ping and restoring the appropriate zone 3 times.
• A WS4920 can not enroll another WS4920.
•Stationary (permanently mounted) devices should only be enrolled with one WS4920. The
only exception is in (UL/ULC) Residential Fire installations, where smoke and CO detectors that
are enrolled with a WS4920 must be enrolled with at least two WS4920’s.
• Fobs and panic pendants may be enrolled with multiple WS4920’s.
• If an enrollment is attempted after all 164 device slots have been filled, the WS4920 emits a 2-
second error tone and all three LEDs light for 20 seconds to indicate that no further devices may
be enrolled.
4. After zone is enrolled, trip again to perform placement test (to test the signal between the
wireless device and the WS4920). Green LED flashes if signal is received.
• If “Good Zone Placement” tone (1 beep) sounds, device location is satisfactory and unit may be
permanently mounted.
• If “Bad Zone Placement” tone (3 loud beeps) sounds, reposition device and trip zone again. Con-
tinue until “Good Zone Placement” (1 beep) tone sounds.
5. Repeat steps 2-4 to enroll and placement test other zones.
• To exit, press Programming button again for 1 second or place cover back on WS4920. “Mode
Exited” (3 beeps) tone sounds.
NOTE: If the WS4920 tone can not be heard while testing the device, set the alarm panel into
individual placement test mode using the WS4920 serial number. The WS4920 placement test
results are sounded through the alarm panel siren.
• Although good results may be obtained on the WS4920, bad results are still possible from the
alarm panel due to collisions.
• Subsequent violations from an enrolled zone while the WS4920 is in programming mode will
initiate a placement test.

7
Global Placement Testing Devices
Conduct placement testing with doors and windows both open and closed to ensure acceptable
placement. To placement test a 1-way wireless device after the initial Enroll/Placement test process:
1. Place the alarm panel into individual placement test mode for the WS4920 zone (see control
panel installation instructions).
2. Press and hold Programming button for 1 second. “Mode Entered” tone (1 long beep) sounds.
WS4920 is now in global placement test mode. Each zone enrolled on WS4920 gives placement
test result when tripped.
• If “Good Zone Placement” tone (1 beep) sounds, device location is satisfactory and unit may be
permanently mounted.
• If “Bad Zone Placement” (3 loud beeps) tone sounds, reposition device and trip zone again.
Continue until “Good Zone Placement” tone (1 beep) sounds.
3. To exit, press Programming button again for 1 second or place cover back on the WS4920.
“Mode Exited” (3 beeps) tone sounds.
Step 7: Mounting the WS4920
Permanently mount the WS4920 only after completing multiple successful placement tests.
To mount the WS4920:
1. Ensure AC wire is run through channel on back of WS4920.
2. Remove front cover and secure unit to wall through mounting holes using all 4 wall plugs and
screws provided.
3. Place cover back on WS4920.
4. Plug AC adaptor into unswitched AC outlet.
Restoring the WS4920 to Factory Defaults
To restore factory default settings:
1. Within 1 minute of power up, press and hold Programming button for 10 seconds. Sounder
beeps after first second to indicate WS4920 is in Installer mode. After 10 seconds, WS4920
emits double long tone and all LEDs light.
2. Release Programming button and immediately press and hold again for 10 seconds. After 10
seconds, WS4920 emits a 4-second tone and all three LEDs flash.
NOTE: The second button press must occur within 20 seconds of the first or the WS4920 will exit
Enroll/Placement mode.
3. WS4920 beeps three times and LEDs return to normal state, indicating Installer mode exit. If
Installer mode exits before reset is complete, due either to time-out or tamper, repeat procedure.
Replacing the Battery
Replace the backup battery when it no longer holds its charge.
To replace the battery:
1. Disconnect WS4920 from AC.
2. Remove front cover from device.
3. Disconnect battery cable from connector.
4. Loosen screw on battery retention bracket and rotate aside.
5. Lift battery out of holder and insert new one.
6. Reposition retention arm and tighten screw.
7. Attach battery cable to connector on PC board.
8. Snap front cover back into place.
9. Re-connect WS4920 to AC.