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When you see these Safety Symbols and Signal Words on the
following pages, they will alert you to the possibility of serious
injury or death if you do not comply with the warnings that
accompany them. The hazard may come from something
mechanical or from electric shock. Read the warnings carefully.
When you see this Signal Word on the following pages, it will
alert you to the possibility of damage to your door and/or the
door operator if you do not comply with the cautionary
statements that accompany it. Read them carefully.
Mechanical
Electrical
TABLE OF CONTENTS
WARNING
CAUTION
WARNING
WARNING
WARNING
CAUTION
WARNING
WARNING
WARNING
CAUTION
WARNING
WARNING
2
INTRODUCTION
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Agency Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
INSTALLATION
Important Installation Warnings . . . . . . . . . . . . . . . . . . . . . . . . . .4
Mount the Release Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
WIRING
Wiring Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Connections of Initiating Devices and Accessories . . . . . . . . . .7-8
Optional Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-9
TESTING
Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
TROUBLESHOOTING
Operational Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
MAINTENANCE
Maintenance Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Enclosure Mounted LEDs Status Indicators . . . . . . . . . . . . . . . .12
ACCESSORIES AND REPLACEMENT PARTS
. . . . . . . .13
APPENDIX
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
OPERATOR NOTES
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
IMPORTANT NOTES:
• BEFORE attempting to install, operate or maintain the release
device, you must read and fully understand this manual and
follow all safety instructions.
• DO NOT attempt repair or service of your release device unless
you are an Authorized Service Technician.
GENERAL DESCRIPTION
The LiftMaster
®
LM21XP Release Device is UL/ULC listed
normally energized fail-safe device designed for use on rolling
doors, single-slide and center-parting level and inclined track
doors. All models are normally energized fail-safe releasing
devices incorporating state-of-the-art electronic control circuitry.
The release devices respond to emergency conditions generated
from an automatic initiating device and are used in conjunction
with a temperature fuse link system.
This device is designated to be used with manual doors, but can
be used on motorized doors incorporating a fusible link assembly
and drop-out mechanism.
The release device must be powered from 24Vdc received from
an approved UL 1481 regulated power supply with battery
backup. The devices can be activated via a smoke detector or an
alarm relay from the panel’s Form C dry contact relay. The release
device features include a 10-, 20-, 30- or 60-second delay on
alarm, closed door detection capabilities, Form C relay outputs for
the transmission of alarm and trouble signals transmitted to the
fire alarm control panel, an audible trouble sounder, and
diagnostic feedback LEDs.
INTRODUCTION