LiftMaster LM21AFCB User Manual

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The Chamberlain Group, Inc.
845 Larch Avenue
Elmhurst, Illinois 60126-1196

www.liftmaster.com

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APPAPPROVOVED D

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

WARNINGWARNING

WARNING

WARNINGWARNING

WARNING

CAUTIONCAUTION

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

Power Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Connections from Device to the Operator . . . . . . . . . . . . . . . . . .6

Connections of Initiating Devices and Accessories . . . . . . . . . . .7

Optional Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

ADJUSTMENTS

DIP Switch Configuration Setting . . . . . . . . . . . . . . . . . . . . . . . . .9

Selectable Delay Settings (Switches 3 & 4) . . . . . . . . . . . . . . . . .9

TESTING

Test Release Device and Door Operator . . . . . . . . . . . . . . . .10-11

Test Release Device With Battery Backup Without AC Power . .12

TROUBLESHOOTING

Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

MAINTENANCE

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Enclosure Mounted LEDs Status Indicators . . . . . . . . . . . . . . . .14

ACCESSORIES AND REPAIR PARTS

. . . . . . . . . . . . . . .15

APPENDIX

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

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®Fire Control LM21AFCB and LM21AFCBVB
Release Device is UL/ULC listed normally energized fail-safe
device incorporating state-of-the-art electronic control circuitry.
This release device is designed to be used with manual doors or
motorized doors incorporating a reversing electric safety edge to
create an automated door closing system.

The high performance control panel responds to emergency
conditions generated from an automatic initiating device. Upon
activation, the device will then automatically close a motorized
door or mechanically release a door in the absence of motorized
operation. If the alarm is still present and power is available to
the operator, a motorized door can be opened by depressing the
open switch of the operator, after which the door will close again.
If the door meets an obstruction while in alarm, the door will
reverse and make three attempts to close, after which the motor
will be shut off and the door will rest on the obstruction. The
release device may also be optionally set to fully open the door
and subsequently mechanically release the fire door onto the
obstruction.

The device provides 3 count obstruction cycling. A safety timer
within the device will turn the motor off and perform a
mechanical release if the lower limit is not detected within a
predetermined time period. Verify factory-installed options to
desired features during initial testing.

Features include a selectable 10, 20, 30 or 60-second time delay
on alarm, remote test, motor voltage sensing, Form C relay
output, lower limit detection, safety timer, battery support for
release device logic, smoke detectors, standard annunciators and
trouble diagnostic capabilities (does not support operator).
Operating voltage is 120Vac.

As with all releasing device systems, maximum fire protection is
provided when installed in accordance with factory specifications
and used with fuse link systems.

INTRODUCTION

INTRODUCTION

3

AGENCY REQUIREMENTS

Installation and testing to factory specifications shall be
performed by factory authorized personnel for proper operation in
accordance with the latest National Fire Protection Association
(NFPA), Underwriters Laboratories (UL), National Electrical Code
(NEC), local, state, county, district and/or other applicable
building and fire standards, guidelines, regulations and codes
including, but not limited to, all appendices and amendments and
the requirements of the local authority having jurisdiction (AHJ).

SPECIFICATIONS

To prevent possible SERIOUS INJURY or DEATH:

• DO NOT install this device on a motorized door without an

electric safety edge.

• DO NOT use this device without fuse links installed.

• Test every 90 days to assure proper operation of release

device.

WARNINGWARNING

WARNING

VOLTAGE RATING: 120Vac, 60Hz
STANDBY CURRENT: .20A
ALARM CURRENT: .25A
BATTERY RATING: 12V 4.5AH Sealed Lead Acid

Batteries (2), Maximum charge
current .150Amps

BATTERY STANDBY TIME: LM21AFCB, 48 hours

LM21AFCBVB, 36 hours

INITIATING DEVICE: Maximum line impedance 20 ohm;

Maximum current not to exceed
.010A.; Maximum voltage 24Vdc

LOAD RATING: Support and Release 40 lbs. Max.
PHYSICAL DIMENSIONS: 10" x 10" x 5" (h x w x d)

PREPARATION

It is imperative that the wall or mounting surface provide
adequate support for the release device.

Refer to the door manufacturer’s recommendations for use of this
product with specific door being utilized. Use only hardware
approved or recognized by the appropriate testing and listing
agencies in conjunction with the installation of this product.

Additional items may be required to complete the installation:

• Concrete anchors or fasteners

• Sash chain or 1/16 cable

• Eyebolts-hook

• Fuse links

• Turnbuckles

• Smoke detectors (up to 4 may be installed with this device)

Refer to NFPA 72 and NFPA 80 for instructions concerning proper
placement and detection coverage. End-of-line devices shall be
installed for supervision of electrical power to 4-wire smoke
detector. When using 4-wire smoke detectors with this device,
electrical supervision must be provided by means of a UL/ULC
listed end-of-line relay.

ELECTRICAL SPECIFICATIONS

MECHANICAL SPECIFICATIONS

FUSES: 2A @ 250V, 2AG Slo-Blo Type
MOTOR CONTROL SENSE: Input Voltage 24Vac/dc

Typical +15% / –10%;
Input Current not to exceed .004A

AUXILIARY POWER: 24Vdc @ .75A Maximum
COMMON ALARM RELAY:

.5A 125Vac 60Hz

(MAX. CONTACT RATING) 1A 24Vdc Resistive

WEIGHT: Approximately 18 lbs.
(INCLUDING BATTERIES)

Smoke
Detector

Release
Device

Turnbuckle

Annunciator

Test/Reset
Switch

Fire Door

Chain
End Link

Fuse Links

Eyebolt

Electric Safety Edge

(Motorized Doors Only)

4

INSTALLATION

Classification:

Releasing device as defined by Underwriters Laboratories.

Installation Requirements:

Intended for “Indoor Dry” locations; all wiring must be performed
in accordance with the most current version of NFPA 72 - National
Fire Alarm Code and the National Electric Code.

MOUNT THE RELEASE DEVICE

Installation procedures vary according to door types. Refer to
door manufacturer’s recommendation that applies to your door.

1. Mount the release device on a vertical surface with chain end
link exiting side of enclosure.

2. Secure the release device enclosure with fasteners (#10 is the

minimum size recommended). If installing in masonry, use
concrete anchors (not provided).

3. Install hardware (sash chain or 1/16 cable, eyebolts-hook, fuse

links, turnbuckles—not provided) according to door
manufacturer’s recommendations. NOTE: The end link

direction of pull must be perpendicular to the side of the
release device enclosure. Install an eyebolt a minimum
distance of 12" from the release device to adequately redirect
sash chain pull.

4. Install end link by pressing mechanical reset to allow insertion

of end link. Push end link completely in and release mechanical
reset to latch end link.

5. Remove sash chain or cable slack by adjusting turnbuckle.

IMPORTANT INSTALLATION INSTRUCTIONS

To reduce the risk of SEVERE INJURY or DEATH:

WARNING

WARNINGWARNING

1. READ AND FOLLOW ALL INSTALLATION WARNINGS
AND INSTRUCTIONS.

2. NEVER connect release device to power source until
instructed to do so.

3. DO NOT install this device on a motorized door without
an electric safety edge.

4. DO NOT use this device without fuse links installed.

5. Concrete anchors MUST be used if mounting release
device into masonry.

6. DO NOT exceed maximum pull rating of 40 lbs. on
releasing device.

Smoke
Detector

Release
Device

Turnbuckle

Annunciator

Test/Reset
Switch

Fire Door

Chain
End Link

Fuse Links

Eyebolt

Mechanical
Reset Plunger

End Link

Electric Safety Edge

(Motorized Doors Only)

5

WIRING

POWER WIRING CONNECTIONS

This device is designed to be used on motorized doors
incorporating a reversing feature safety edge. Verify wiring
configuration with that recommended by door manufacturer for
use of this product with specific door and accessories being
utilized.

1. Confirm power source for adequate voltage of 108 to 132Vac.

2. Disconnect power at fuse box to the release device and door
operator before continuing.

3. Connect 120Vac (single phase) power source inputs to
terminals L1 (line) and L2 (neutral) of the power strip. The
third position is used for earth ground. NOTE: Do not apply

incoming power or connect battery at this point.

WIRE ROUTING

To reduce the risk of SEVERE INJURY or DEATH:

• ALL electrical connections MUST be made by a qualified
individual.

• Disconnect power at the fuse box BEFORE proceeding. Release
device MUST be properly grounded and connected in
accordance with local electrical codes.

• Installation of ALL wiring and connections, including Class 1
and Class 2 circuits, shall be performed in accordance with,
but not limited to, the latest NFPA, UL and N.E.C. standards
and codes. In addition, ALL installations subject to Canadian
standards shall be performed in accordance with the Canadian
Electrical Code, Part I, with respect to wiring material type,
wiring gauge related to power capacity requirements and
circuit length and wiring methods.

• ALL power wiring should be on a dedicated circuit and well
protected. The location of the power disconnect should be
visible and clearly labeled.

• ALL power and control wiring MUST be run in separate
conduit.

• A reversing edge MUST be installed on ALL motorized doors
BEFORE proceeding with the installation.

WARNING

WARNINGWARNING

Mechanical Reset
Plunger

Ground

Option
DIP Switch

Power
Strip

High Voltage
Wiring

Low Voltage
Wiring

Voice Board
Wiring

Annunciator
Wiring with
Sleeving

PARTS KIT

Refer to Wiring section for proper application of these parts.

LM2AG2AMP

2.2k Ohm Resistor

LMEOLRES-2-2

L1L2