Securitron FA-XDT-24, FA-XDT-12, EXD-1L, BA-XDT-12, BA-XDT-24 Installation Instructions

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SECURITRON MODEL XDT-12 AND XDT-24 EXIT DELAY TIMERS

INSTALLATION AND OPERATING INSTRUCTIONS

1. DESCRIPTION

The XDT-12 and XDT-24 are specialized exit delay timers designed to be integrated with fail safe
electric locks and switch equipped devices for delay initiation and reset. This creates a modular
door control package which fully meets American and Canadian building codes for delayed exit
(Special Locking Arrangements). See Section 3 for detailed information on these codes. As the
part numbers show, separate versions of the XDT exist for operation on 12 or 24 VDC.

The power of the XDT, however, goes considerably beyond meeting the code requirements.
Delayed exit is only one aspect of door control in sophisticated facilities. The XDT includes
optional functions that can be employed in entry control, do or/lock monitoring, and authorized
immediate exit. External switches such as time cl ocks can also put the XDT into dif ferent mode s
if delayed exit is not desired at all times.

To simplify the installer's task in understanding these instru ctions, we first describe delayed exi t
which is the primary function of the XDT. Later sections describe the timer's optional function s.
These sections can be quickly browsed to see if any of the functions will improve the installation.

2. DELAYED EXIT FUNCTIONS

Exact code requirements for delayed exit vary somewhat in different jurisdictions. These
detailed variations will be addressed in Section 3. In general, however, delayed exit includes the
following components and sequences of operation.

In the normal condition, the door is locked. The locking device must be a fail safe electric lock
(secure when powered). It is most commonly an electromagnetic lock such as Securitron's
Magnalock. An initiate device is used to start the exit sequence. The XDT timer requires that
the initiate device includes a normally closed dry switch which opens to start the sequence. The
safest type of initiate device is one that relies on no special knowledge for operation.
Securitron's Touch Sense Bar is an excellent choice for non fire rated doors. A sw itch equipped
fire rated panic bar is appropriate for fire rated doors. Push buttons a re also used but they may
not be acceptable to local building officials on the grounds of requiring special knowledge. O ther
initiate devices include mats, curtain detectors and monitoring strikes.

Once the initiate switch opens, a nuisance delay period begins. The nuisance delay p eriod may
be set for 1, 2 or 3 seconds. The duration of the nuisance delay period will depen d on the local
code and/or on the desires of the end user. The nuisance delay function can also be disa bled.
During the nuisance delay period, the XDT provides a pulsing relay output which is typically use d
to operate a local alarm horn or Sonalert. This notifies the person at the door that he has
activated the initiate device. If he intends to exit, he must maintain pressure on the device u ntil
the end of the nuisance delay period. If he releases the initiate device before the nuisance dela y
times out, the local alarm signal will stop and the doo r will revert to normal (lo cked) mode. The
sole purpose of the nuisance delay function is to deal with accidental triggering of the initiate
device. It makes particular sense to employ the nuisance delay in buildings occupied by a
changing population which will not be familiar with the exit control system. Retail stores or
museums are good examples of such buildings.

Once the nuisance delay times out (or immediately if no nuisance delay has been set) the
release delay period begins. The XDT's local alarm output will go from pulsing to stead y. This
will alert the person at the door that he need no longer maintain activation of the initiate device.
Once the release delay begins, it is irrevocable. The door will release at the end of the period.
Code mandated duration of the release delay period is 15 se conds although certain jurisdictions
allow extension to 30 seconds by local building or fire safety officials. The release delay period
on the XDT can therefore be set for 15 or 30 seconds and this total release delay time includes
the nuisance delay. For example, if a 2 second nuisance delay is set, the remaining release
delay will automatically be 13 or 28 seconds for a total of 15 or 30 seconds.

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Once the door has released, it will remain released until manually relocked by a reset device.
This is a normally closed switch which is momentarily activated. Relocking actually occurs on
reclosure of the switch. Most commonly the reset device is a momentary spring loaded
keyswitch such as Securitron's model MK. We recommend that the keyswitch be mounted at the
door as this insures that security staff will actually i nspect the door. In some jurisdictions the
reset device may be a doorswitch. With a doorswitch, relocking occurs from the act of exiting
the door. Certain codes require the use of a doorswitch as will be discussed in Section 3. The
American BOCA code does require use of a doorswitch and also has a special and unique timed
relocking sequence which is explained in section 3.4.

FIG. 1: OVERVIEW OF XDT BOARD

DELAY CONTROL TERMINAL

RESET INPUT

INITIATE INPUT

FREE EGRESS INPUT

BYPASS INPUT

LOCK STATUS INPUT

0V (NEG) POWER

+V POWER

NOTE: INPUTS OPERATE

BY BEING CONNECT E D TO +V

DC

RS

IN

FE
BP
LS

+

NC
C3

NO

NC
C2
NO

NC

C1
NO

DIPS

LOCK CONTROL
RELAY

NORMALLY ENERG IZ E D

REMOTE ALARM
RELAY

NORMALLY ENERGIZED

LOCAL ALARM

RELAY

NORMALLY DEENE RG IZED

Use of the "local alarm relay" as shown in Figure 1 is required by code to signal at the door that
the system is working. The local alarm relay pulses during the nuisance delay period and
steadily energizes during the release delay period. At the end of this period, when the lock
releases, the local alarm relay deenergizes. This informs the person exiting that the door may
be used. A second relay (shown above) is called the remote alarm relay. This relay is
normally energized; it deenergizes to show an alarm condition. It signals alarm from the
beginning of the release delay period until the door is relocked. The remote alarm relay is
intended to signal to a security office that a se curity violation i s occurr ing at the d oor. It ign or es
the nuisance delay period as this should be seen as a "false alarm" unless the delay becomes
irrevocable. It also continues to signal until the door is relocked, correcting the security
violation. The remote alarm relay should also be considered a general "trouble" signal. If the
board loses power, this relay will deenergize signaling trouble. It is also used to signal other
optional alarm conditions described in Section 7.

3. SPECIFIC CODE REQUIREMENTS

We must strongly emphasize that the following sections on code requirements should not be
considered definitive. They represent Securitron's best understanding of the individual code s at
the time of this manual's most recent revision. Codes, however, can change suddenly an d are
also subject to local interpretations that may diff er from the descripti ons that follow. You shou ld
consider these descriptions as a starting point which should be confirmed or altered by the local
authority having jurisdiction.

In the following 5 sections, we describe individual code requirements in 4 functional areas:
Nuisance delay, Release delay, Relocking and Power. The main issue in the Power function is
whether or not battery backup can be applied to the locking system to keep the d oor functional
in a local power failure.

All of the codes call for immediate release of all locks in the event of activation of the fire
detection system. The proper way to accomplish this is by employing an auxiliary latching relay
with contacts of appropriate size to handle the total lock load. The relay should be a listed part
of the fire detection system and all lock system DC power should flow through its NC contacts.
The individual codes also typically specify the type of fire detection system that must be in place

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and limit use to certain occupancy types. These details do not affect how the XDT board is
configured so they are beyond the scope of this manual. We recommend strongly, however,

that the end user assure himself that his occupancy and fire detection system qualify
to support delayed exit in his local area.

These exit delay timers have only been evaluated by UL for use in the EXD-1 and EXD-1F FWAX
systems.

3.1 NFPA 101 (SPECIAL LOCKING ARRANGEMENTS)

This code by the National Fire Protective Association was the first implementation of delayed
exit. It formed the basis for the different model code versions which follow and is still used in
many specifications.

NUISANCE DELAY: Permitted up to 3 seconds.
RELEASE DELAY: 15 seconds or extension to 30 seconds with local approval.
RELOCKING: Must be "manual". This is generally interpreted to mean that a doorswitch ca n not

be used for relocking. A keyswitch is the typical technique used.
POWER: The door must release when DC power to it is cut off. This m eans that battery backup

of the system power supply can be considered acceptable, but this is a point to confirm with the
local authority.

3.2 STANDARD BUILDING CODE

NUISANCE DELAY: Not allowed.
RELEASE DELAY: 15 seconds or extension to 30 seconds with local approval.
RELOCKING: Must occur only when the door opens. A do orswitch rather than a keys witch must

be used.
POWER: The door must release when DC power to it is cut off. This m eans that battery backup

of the system power supply can be considered acceptable, but this is a point to confirm with the
local authority.

3.3. UNIFORM BUILDING CODE

NUISANCE DELAY: Required and must be set at 2 seconds.
RELEASE DELAY: 15 seconds only.
RELOCKING: Must be "manual" and must be located at the door. This is generally interpreted to

mean that a doorswitch can’t be used for relocking. A keyswitch is typical.
POWER: The door must release when power to it is cut off. The door must also release if power

to the smoke detection system or exit illumination system is lost . This is g enerally a ccomp lish ed
by using the same line voltage source to operate the lock power supply as o perates the smoke
detection and exit illumination systems. Battery backup for the locks is normally excluded.

3.4 BOCA

NUISANCE DELAY: Required and must be set at 1 second.
RELEASE DELAY: 15 seconds or extension to 30 seconds with local approval.
RELOCKING: A doorswitch must be used and a special type of timed relocking is required. After

the release delay expires, the lock releases. When the door is opened, the doorswitch chan ges
state but nothing happens immediately (the lock remains released). When the door re closes, a
"relock delay" of 30 seconds begins. If the door is not opened again during this 30 second
period, it will relock. If it is opened again, the 30 second relock delay will begin again on door
closure. The door will only relock when it has been left undisturbed for 30 seconds after
reclosure. The local authority may extend the relock delay to 45 seconds f or sensitive facilities.
The standard XDT board supports the BOCA 30 second relock sequence. If the 45 second relock
sequence is required, contact the factory to receive a modified board.

POWER: The door must release when power to it or to the building is cut off. Battery backup of
the lock power supply is therefore specifically excluded.

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