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, door/lock monitoring, and authorized immediate exit. External switches such as time clocks can also put the XDT into different modes if delayed exit is not desired at all times.

To simplify the installer's task in understanding these instructions, we first describe delayed exit which is the primary function of the XDT. Later sections describe the timer's optional functions. 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 detailed variations will be addressed in Section 3. following components and sequences of operation.

somewhat in different jurisdictions. These In general, however, delayed exit includes the

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 switch equipped fire rated panic bar is appropriate for fire rated doors. Push buttons are also used but they may not be acceptable to local building officials on the grounds of requiring special knowledge. Other initiate devices include mats, curtain detectors and monitoring strikes.

Once the initiate switch opens, a nuisance delay period begins. The nuisance delay period may be set for 1, 2 or 3 seconds. The duration of the nuisance delay period will depend on the local code and/or on the desires of the end user. The nuisance delay function can also be disabled. During the nuisance delay period, the XDT provides a pulsing relay output which is typically used 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 until the end of the nuisance delay period. If he releases the initiate device before the nuisance delay times out, the local alarm signal will stop and the door will revert to normal (locked) 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 steady. 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 seconds 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 inspect 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	DC	NC	LOCK CONTROL
RESET INPUT	RS
		C3	RELAY
INITIATE INPUT	IN	NO	NORMALLY ENERGIZED
FREE EGRESS INPUT	FE	NC	REMOTE ALARM
BYPASS INPUT	BP	C2	RELAY
LOCK STATUS INPUT	LS	NO	NORMALLY ENERGIZED
0V (NEG) POWER		NC	LOCAL ALARM
+V POWER	+	C1	RELAY
		NO	NORMALLY DEENERGIZED
NOTE: INPUTS OPERATE
BY BEING CONNECTED TO +V
		DIPS

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 security violation is occurring at the door. It ignores 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 codes at the time of this manual's most recent revision. Codes, however, can change suddenly and are also subject to local interpretations that may differ from the descriptions that follow. You should 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 door 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 can 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 means 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 doorswitch rather than a keyswitch must be used.

POWER: The door must release when DC power to it is cut off. This means 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 generally accomplished by using the same line voltage source to operate the lock power supply as operates 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 changes state but nothing happens immediately (the lock remains released). When the door recloses, 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 for 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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