Digital Monitoring Products 521LX User manual

Description
The Model 521LX and 521LXT Smoke Detectors are the
industry’sfinestsmokedetectorswithanalogfeaturessuch
as remote maintenance reporting (CleanMe™), drift
compensation, and multi-criteria detection. These smoke
detectors incorporate an addressable single point module
for connection to the LX-Bus™of an XR200 Command
Processor™Panel with firmware version 1.04 (6/11/98) or
higher.The521LXTalsoincludesmulti-criteriafastresponse
heat sensor algorithms for detection of a broad range of
fires.
Single Point Addressable
The 521 incorporates a factory mounted, addressable
single point zone expander on the back of the smoke
detector. The included 4-wire harness allows a direct
connectiontotheLX-BusofanXR200panel.Theintegrated
zone expander reports smoke detector alarm and service
conditions to the panel as a single zone. Also included is a
TXD LED that flashes when data is sent to the XR200
panel.
CleanMe™Remote Maintenance/Trouble
Reporting Feature
The 521 detectors have a unique feature that allows a
service signal to be sent to the XR200 when the smoke
detector has drifted outside UL sensitivity ranges or a
hardware fault exists. In most cases, the signal will be the
result of the detector becoming dirty over time and, as a
result, are over sensitive. This condition could result in a
false alarm. The CleanMe™signal enables the XR200 to
receive a service signal allowing an installer time to clean
the detector by replacing the inexpensive optical chamber
withanewone(DMPModel525).Thisserviceinformation
can be transmitted to the Central Station.
LT-0403 (7/98)
INSTALLATION 521LX and LXT Addressable Smoke Detectors
Self-Diagnostics with Automatic Sensitivity
Testing
Each 521 photoelectric smoke detector monitors its own
sensitivity and operational status. Once a day, and
immediatelyuponfirstpowerup,itperformsafulldiagnostic
test that includes a dynamic test of the sensing chamber
and internal electronics. If the detector drifts out of its
sensitivityrangeorfailsinternaldiagnostics,thealarmLED
flashes once every second to indicate trouble. This meets
NFPA 72 field sensitivity testing requirements without the
need for external meters.
Drift Compensation Built-In
The521 detector is the industry’sfirstaddressable smoke
detector with built-in drift compensation. The 521
automaticallyadjustssensitivity,uptoamaximumof1.0%/
ft., as it becomes dirty. This feature increases immunity to
dust and dirt by 30-50%.
Installation
Consult Local Authority Having Jurisdiction (AHJ) and
NFPA 72 for specific installation information regarding
smoke detector spacing, placement, and special
applications.
The 521 detectors wire directly to the XR200 panel 4-wire
LX-Bus™.SeeCompatibleLX-BusInterfaceCards.When
wired to the panel LX-Bus, the 521 uses only one of the
available expansion zone numbers allowing you to assign
additionalzoneexpanderstothenextzonenumberaddress.
See Addressing the 521LX and LXT.
Consider the Locking Mechanism BEFORE
Installation
Each 521 detector head is equipped with a break away
locking tab slot to prevent unauthorized removal of the
detectorhead.Forinstallationswhereunauthorizedremoval
of the detector head is not a concern, i.e. high ceilings, no
action is required. The head can be removed by simply
turning counterclockwise.
However, when the head must lock to the base, simply
break away the locking tab and the “knock out” for the
screwdriver slot with a pair of pliers. Then, to remove the
detectorhead,insertasmallscrewdriverintotheslotofthe
side of the base and press in while simultaneously turning
the detector head counterclockwise (see Figure 2).
2841 E. Industrial Drive Springfield, MO 65802-6310 800-641-4282
CleanMe™is a trademark of Sentrol, Inc.
521 Power and Data Bus Wiring
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
J4
J7
onestens
TXD
J1
Bottom view
Figure 1
Black (common)
Green (data)
Yellow (data)
Red (Smoke
power)
Requires Model 462N,
462P, 472, or 481
Interface Cards.
XR200 LX-Bus
Figure 2
UL
R
LISTED

2
Installing the Mounting Base
The mounting base included with each 521 makes the
smoke detector easy to install and remove if necessary.
The detector head simply twists off of its 4.75" mounting
base.
The mounting base connects directly to standard single-
gang electrical boxes, three-inch round, or four-inch
octagonal boxes. The base may also be mounted without
electrical boxes if approved by the AHJ or if codes allow.
Installing the Detector Head to Mounting Base
Toinstalladetectorhead,simplylineuptheraisedmarking
on the side of the detector with the arrow on the mounting
base.Inserttheheadandrotateitclockwiseapproximately
15 degrees to snap into place (see Figure 3).
Removing the Detector Head
Toremovethedetectorhead,simplyturncounterclockwise.
However,ifthelockingtabslothasbeenremoved,inserta
smallscrewdriver intothelockingtab slotonthe side ofthe
baseandpressinwhilesimultaneouslyturningthedetector
head counterclockwise (see Figure 4).
Wiring
First, pull wire through electrical box, then through center
opening of the 521 mounting base. Connect the 4-wire
harness to the J1 terminal according to the wiring diagram
in Figure 1.
Follow the wiring in Figure 1 when connecting the 521
detector to the XR200 LX-Bus. The maximum distance for
anyoneLX-Buscircuitis2,500feet.Themaximumnumber
of LX-Bus devices on any one 2,500 foot circuit is 40. To
increasethewiringdistanceand/ornumberofdevices,you
must install a DMP 710 Bus Splitter/Repeater Module.
Refer to page 4 for more information about the Model 710.
Addressing the 521LX and LXT
Addressing the 521 requires setting two on-board rotary
switches to match the address of the XR200 LX-Bus zone
number. For zone numbers 100 to 199, set the switches to
matchthelasttwodigitsofthezonenumber.Forexample,
to assign the 521 detector to zone number 120, you would
setthe leftrotaryswitch(labeled "TENS") to2andthe right
rotary switch (labeled "ONES") to 0.
Testing Each Detector
All 521 smoke detectors are shipped with a plastic dust
cover for use in areas where construction is continuous.
Smoke detectors will not work with the dust cover in place.
Remove the dust cover when installation is completed,
prior to testing. Also, disconnect alarm notification
appliances, releasing service devices, and extinguishing
systems prior to detector tests. Be sure to reconnect all
devices at the conclusion of testing.
Per NFPA 72, “all smoke detectors shall be tested in place
annually, to ensure smoke entry into the sensing chamber
and alarm response. Testing with smoke or listed aerosol
acceptabletothemanufacturer,shallbepermitted.”Annual
functional testing is best accomplished using Smoke! In a
can, Model 526, available from DMP. Carefully follow the
directions on the can.
Thedetectorperforms a smoke test every 9 secondswhile
flashing its LED. If smoke is detected, the rate of sampling
increasestoevery4.5seconds.Excessivesmokemustbe
detected in three consecutive tests for the alarm to sound.
Therefore,whentestingthedetectorwithsmolderingpunks
orcottonwicks,holdthesmokesourceneartheopeningfor
smokeentryandgentlydirectsmokeintothedetectorfor20
seconds or until an alarm is indicated. BE SURE TO
PROPERLYEXTINGUISHTHESMOKESOURCEAFTER
TESTING!
Thisisagross,go/no-gotestandisnotareliableindication
ofdetectorsensitivity.Ifitissuccessful,theLEDwillremain
lit. For in-depth sensitivity testing, see Sensitivity Level
TestModebelow.Resetthedetector,thenbloworbrushoff
the optical block base and snap a new optical block
chamber (see Figure 8) back in place, replace the cap and
verify sensitivity with the Sensitivity Level Test.
Figure 5: Address switches
Example:
Rotary switches on the
521 module set for zone
address 120.
ONES
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
TENS
2841 E. Industrial Drive Springfield, MO 65802-6310 800-641-4282
521LX and LXT Installation
Figure 3
Figure 4

3
Specifications
Additional Diagnostics Available with
Sensitivity Level Test Mode
Each smoke detector also includes a special sensitivity
level test mode that is activated by holding a magnet near
the integral reed switch for more than one second (see
Figure 6). Once the routine starts, the alarm LED will flash
one to nine times, indicating actual sensitivity and whether
or not service is required.
Afterthe sequence of blinks,if the sensitivityis found to be
within limits and if all other tests pass, the detector will go
into alarm until reset by the panel. If the sensitivity is not
within limits, or an unserviceable hardware fault has been
detected, the alarm LED will continue to flash once per
second until the detector is reset by the panel. If sensitivity
test indicates an unacceptable level, take action
recommended above. See the 521 Sensitivity Table.
2841 E. Industrial Drive Springfield, MO 65802-6310 800-641-4282
521LX and LXT Installation
Figure 6
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Maintenance, Cleaning & Sensitivity
The 521 smoke detectors are designed for easy field
serviceandmaintenance.Ifasmokedetectordriftsbeyond
itsapprovedsensitivityrangeformorethan24hoursorfails
internal diagnostic tests during power-up, the unit
automatically indicates trouble by flashing its LED every
second. Under normal conditions the LED flashes every 9
seconds. Therefore, a simple visual check of the LED
statusmeetsNFPA72fieldsensitivitytestingrequirements
without the need for external meters or ladders. In
accordance with NFPA 72-7-3.2.1, smoke detector
sensitivity should be checked within one year after
installation and every alternate year thereafter, in
commercialinstallations,oreverythreeyearsinresidential
sites.
The sensing chamber of the 521 photoelectric detector
unsnapsforeasyfield cleaningandservice. Wheneverthe
status LED indicates cleaning is necessary, remove the
photoelectric detector cap, snap off and throw away the
opticalblock. Then blow orbrush off the opticalblockbase
andsnap a new opticalblock chamber (see Figure8)back
in place, replace the cap and verify sensitivity with the
Sensitivity Level Test.
Compatible LX-Bus Interface Cards
The following Expansion Interface Cards are compatible
with the 521 smoke detectors: 462N, 462P, 472, and 481.
Figure 7: 521 Sensitivity Table
Figure 8
Model 525
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Smoke Detector Dip Switches
If the 521 smoke detector includes dip switches to the left
ofthescrewterminals,theyarefactorypresetandmustnot
be changed.

2841 E. Industrial Drive Springfield, MO 65802-6310 800-641-4282
DigitalMonitoringProducts
LX-Bus™Installation Specifications
Three factors determine the performance characteristics of the DMP LX-Bus™: the length of wire used, the number of
devices connected, and the amount of current required by the devices. The three specifications to keep in mind when
planning an LX-Bus installation are:
1. Maximum cumulative distance for any one LX-Bus circuit is 2,500 feet. This number can be increased to 50 if
the wire run remains under 2,000 feet.
2. Maximum number of LX-Bus devices per 2,500 feet is 40 regardless of the gauge of wire. This distance can be
in the form of one long wire run or multiple branches with all wiring totalling no more than 2,500 feet.
3. Maximum voltage drop between the panel (or auxiliary power supply) and any device connected to the LX-Bus
is rated at 2.0 VDC. As an example of the voltage drop, if the voltage across the red and black wires at the panel
is 13.8 VDC the voltage measured at each device on the circuit must be equal to or greater than 11.8 VDC.
Ifthevoltageatanydevice,includinga710module,islessthantherequiredlevel,aULlistedauxiliarypowersupply
should be added at the end of the circuit. (The voltage drop can also be reduced by increasing the gauge of wire
usedonthecircuit.)The2.0VDCruleappliestoLX-Buscircuitspoweredeitherbythepanelorbyanauxiliarypower
supply.
Multiple LX-Bus circuits
In this example, the first 710 module is in close proximity to the panel. At this point, the 710 is used to branch the LX-Bus
into three separate circuits. Each of these circuits can be run a distance of 2,500 feet. At the end of the 2,500 feet, another
710 module can be installed to add another 2,500 feet of LX-Bus capability.
Note: The total distance of all circuits cannot exceed 15,000 feet.
Install the 710 module at the
point where the circuits divide.
LX-Bus Devices
Panel
710 LX-Bus Module
2,500 feet
2,500 feet
2,500 feet
2,500 feet
2,500 feet
2,500 feet
Panel
Voltage across red and
black here is 13.8 VDC Voltage across red and black at all devices
along the LX-Bus must be 11.8 VDC or greater
LX-Bus Devices LX-Bus Devices
710 Bus Module
LX-Bus Devices LX-Bus Devices
Power Supply
Panel
Power Supply
Do not connect the Red wire between
the panel and the first device.
If the wiring distance between the two auxiliary power
supplies is less than 250 feet, do not connect the Red
wire between the 710 and the first device.
A second power supply is only
required if the voltage drop from th
e
first supply is greater than 2.0 VDC
.
710 Module
Specifications
Power: 8.0 to 15.0 VDC
Current: 30mA
Dimensions: 4.5"x2.75"x1.75"
Accepts 14 to 22 AWG Wire.
For more 710 information see
LT-0310.
Voltage across red and
black here is 13.8 VDC
Voltage across red and black at all
devices along the LX-Bus must be
11.8 VDC or greater
▲