Chamberlain LiftMaster LM21XPBB Manual Download

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Horn/Strobe Annunciator
#LMHS2475ADA

Horn/Strobe

NOTE:

A maximum of two annunciators may be installed in this manner.

10k Ohm @ 1/2 watt
Supervisory Resistor
(LMEOLRES-10)

Terminal Strip

Non-conductive sleeve

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Attach to Common on
N/O Proximity Switch

Attach to N/O Position
on Proximity Switch

Proximity Switch Part
No. LM56A

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Fire Alarm
Control Panel

Normally Closed

Common

Terminal Strip

N/C Alarm Relay Output

Common

N/O Alarm Relay Output

N/C Trouble Output

Trouble Common

N/O Trouble Output

Make all necessary
connections to the
Fire Alarm Panel as
required by the project
specifications and the
Authority Having
Jurisdiction

W I R I N G

FIGURE 7

CONNECTIONS OF INITIATING DEVICES AND
ACCESSORIES (cont’d)

Relay Module Installation

In lieu of smoke detectors, the release device may be put into
alarm by the fire alarm control panel. Most commonly, a relay
module is used as an interface between the fire alarm control
panel and the release device. The relay module must provide
Form C dry contacts for connection to the appropriate terminals
on the release device (Figure 7).

NOTE:

When choosing a relay module to activate the release

device in an alarm condition, always select one that provides
Form C dry contact relays. Do not use any relay module
providing or passing any (control) voltage through the contacts
into the release device. The passage of voltage through such a
relay module into the release device will cause problems with the
operation of the device and may damage the device’s terminals
and/or circuit board. Make certain that the 10k ohm resistor is
placed between positions 3 and 4.

OPTIONAL CONNECTIONS

CLOSE DOOR DETECTION OPTION

Connect wiring from N/O electrical loop, using a proximity switch
or other similar device with dry contacts, to 7 and 8 (Figure 8).
The switch should be placed to engage when the door is in the
closed position and so that it will toggle states from its N/O
condition (switch closed when door is closed) to a closed
condition indicating that the door edge has made contact with
desired down position. When the switch is closed by contact
from the door, the release device will not activate on alarm,
thereby eliminating nuisance gravity drops through the
inadvertent release of the fusible link assembly. This option only
works as long as power is available to unit. Fail-safe operation is
maintained under all operating conditions, and if power is not
available to the unit, the fusible link assembly will be released.
This is a power-limited, unsupervised circuit. This proximity
switch must be mounted in the same room as the release device.

RELAY AND TROUBLE OUTPUTS OPTION

Connect wiring from the Alarm Relay Outputs (#11 N/C or #13
N/O and #12 Common) to the appropriate inputs on the Fire
Alarm Control Panel to provide a signal at the panel when the
release device is in an alarm state. Connect wiring from the
Trouble Relay Outputs (#14 N/C or #16 N/O and #15 Common) to
the appropriate inputs on the Fire Alarm Control Panel to provide
a signal at the panel that the release device is in a trouble state
(Figure 9). If these features are desired, coordinate the
interconnection between the Release Device and the Fire Alarm
Control Panel with the fire alarm installer.

ANNUNCIATOR OPTION

To power one or two (maximum) horn/strobes or similar
annunciators , connect wiring to terminals 9 and 10 (Figure 10).
Route wires through the non-conductive sleeving (provided)
covering any exposed bare wires. Maximum distance of wire run
within conduit not to exceed 20' total. This is a supervised, non
power-limited circuit.

NOTE:

If installing two visual annunciators, they must be

installed on opposite sides of wall. If unused, place 10k Ohm
Resistor between positions 9 and 10.

FIGURE 9

FIGURE 8

FIGURE 10

To prevent DAMAGE to the circuit board, ALL connections from
terminals 3 through 16 MUST be dry contact type.

ATTENTION

AVERTISSEMENT

WARNING

CAUTION

WARNING