Lift-Master SW425 User Manual
Serial # ________________________
(located on electrical box cover)
Installation Date __________________
2 YEAR WARRANTY
MODEL SW425 IS FOR USE ON VEHICULAR PASSAGE
GATES ONLY AND IS NOT INTENDED FOR USE ON
PEDESTRIAN PASSAGE GATES
OWNER’S MANUAL
MODEL SW425
RESIDENTIAL SWING GATE OPERATOR
2
CARTON INVENTORY
Before beginning your installation check that all components
were supplied and received undamaged. Refer to list below
for factory supplied parts.
Description Qty.
Safety Gate Brochure 1
Gate Bracket 2
Take-Up Bolt 2
Nickel Plated Chain #50 1
U-Bolt 2" 5/16-18 4
U-Bolt 3" 3/8-16 4
Square Head Set Screw 7/16-14 4
Hex Nut 1/2-13 4
Flange Nut 5/16"-18 8
Flange Nut 3/8"-16 8
Flat Washer 3/8" 8
Flat Washer 1/2" 4
Lock Washer 1/2" 4
Antenna 1
HARDWARE KIT
SW425 (K7X-SW425)
IMPORTANT NOTES
• BEFORE attempting to install, operate or maintain the operator,
you MUST read and fully understand this manual and follow all
safety instructions.
• DO NOT attempt repair or service of your commercial door and
gate operator unless you are an Authorized Service Technician.
TABLE OF CONTENTS
OPERATOR SPECIFICATIONS
Carton Inventory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Operator Dimensions and Specifications . . . . . . . . . . . . . . . . . . .3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
OPERATOR WARNINGS
UL325 Model Classifications . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Safety Installation Information . . . . . . . . . . . . . . . . . . . . . . . . . .7
Suggested Entrapment Protection Device Locations . . . . . . . . . .8
Safety Precautions for Swing and Ornamental Gates . . . . . . . . .9
Warning Sign Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
INSTALLATION
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Determine Gate Operator Location . . . . . . . . . . . . . . . . . . . . . .10
Post Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Pad Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Control Arm Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Gate Bracket and Pipe Arm Installation . . . . . . . . . . . . . . . . . . .12
WIRING
Power Wiring Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Battery Run Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Solar Powered Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
ADJUSTMENT
Right/Left Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Auto Close Timer Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . .15
Gate Sensitivity Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Limit Switch Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Control Connection Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Other Common Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . .17
ACCESSORY WIRING
. . . . . . . . . . . . . . . . . . . . . . . . . . . .18
OPERATION AND MAINTENANCE
Operator Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Sensitivity Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Control Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Gate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20-21
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22-24
NOTES
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
REPAIR PARTS
Repair Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Illustrated Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
WARRANTY POLICY
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
SERVICE INFORMATION
. . . . . . . . . . . . . . . . . . . . . . . . . .28
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 gate and/or the gate
operator if you do not comply with the cautionary statements that
accompany it. Read them carefully.
Mechanical
Electrical
WARNING
CAUTION
WARNING
WARNING
WARNING
WARNING
WARNING
3
MODEL SW425
OPERATOR DIMENSIONS
• Height: 16-1/2" (41.9 cm)
• Width: 14-1/2" (36.8 cm)
• Depth: 13-1/2" (34.3 cm)
SHIPPING WEIGHT
• Operator: 53 lbs. (24 kg)
• Hardware Package: 12 lbs. (5.4 kg)
• Mounting Posts: 16 lbs. (7.3 kg)
Total: 83 lbs. (37.7 kg)
Options: Operator and Battery Run Package: 59 lbs. (26.8 kg)
Low Voltage Cable: 1 lb./10 ft. (.5 kg/3.1 m)
Concrete Mounting Stand: 17 lbs. (7.7 kg)
APPLICATIONS
• Maximum Gate Weight: 300 lbs. (136.1 kg)
• Maximum Gate Length: 13 ft. (4 m)
POWER REQUIREMENTS
Dedicated 115 Vac (+/– 10V), 5A Power Circuit
NOTE: For standard operator, place 115Vac at or near the
operator. For battery run operator, place 115Vac
within 1000' (304.8 m) of the operator.
There are three possibilities for supplying power to the
SW425 gate operator:
• The standard power supply version is made to connect
directly to 115 Volt, 5 Amp power source and is available
for full systems capability models. This power supply must
be at or near the gate operator location. Because of the low
current draw, 115 Volt power may be run as far as 1000'
(304.8 m) with 12 gauge wire from the main breaker panel
and can be run much farther with larger wire.
• Supply power to the operator with the low voltage battery
run version of the SW425. To supply power to the SW425
Battery Run, wire as small as 16 gauge can be run as far
as 300' (91.4 m) from a charger that is plugged in
remotely. Because the power is low 12Vdc, the wire can be
direct burial wire which eliminates the need for expensive
conduit runs.
• Supply power to the SW425 with the solar power version
of the operator. The Solar model does not require any
power to be run because the operator and solar power
supply are self contained. The panel may be placed several
hundred feet from the operator if this is necessary to
achieve maximum sunlight conditions.
INCLUDED WITH OPERATOR: Check package to make sure
it contains the following items.
STANDARD GATE OPERATOR
• 1-Model SW425 Gate Operator
• 2-Mounting Posts 2" Dia. x 36"
• 1-Gate Bracket
• 2-Swivel Joints
• 2-Sections, Pipe Arm
• 1-Primary Arm
• 2-Safety Warning Placards
OPERATOR DIMENSIONS AND SPECIFICATIONS
BATTERY RUN ONLY (OPTIONAL)
• 1-Burial Cable, 10'
• 1-Charger, 12Vac
• 1-Battery, 12Vac
SOLAR ONLY (OPTIONAL)
• 3-Pipe Sections, 1" x 24"
• 2-Pipe Couplings, 1"
• 1-Solar Panel Assembly
• 5-Lock Rings
• 2-Batteries, 12 Vac
(See parts identification)
16-1/2"
(41.9 cm)
13-1/2" (34.3 cm)
20-3/4"
(52.7 cm)
14-1/2" (36.8 cm)
4
FEATURES
SENSITIVITY
The SW425 has a built-in safety feature. When adjusted properly it delivers only enough power to the motor to overcome the resistance
of the gate. If the gate hits a vehicle or pedestrian, it will immediately stop or reverse. The dc motor technology incorporated into the
SW425 sensitivity feature is more sensitive and is at least 50% more effective than traditional ac current sensors.
SOFT START/SOFT STOP
A unique feature of the SW425 is the Soft Start/Stop feature. Traditional gate openers begin opening the gate with full power causing a
jerking effect, increasing wear on mechanical parts. The SW425 begins to open/close the gate slowly, then increases to full speed. This
creates a gentler transition which considerably reduces wear on mechanical parts.
BATTERY RUN/LOW VOLTAGE
The SW425 is available in battery run & solar versions. The benefit of battery run or solar power is the ability to operate the gate
without power. During a power outage the gate will operate normally. It can be opened up to 150x before power is restored. Another
benefit of battery run is that it is does not require 115V at the operator. Running high voltage is typically expensive and strictly
regulated. All that is needed to supply power to the SW425 battery run is some inexpensive low voltage burial cable. If the cable is 16
gauge it can be run as far as 300'. For solar versions of the SW425, no power needs to be run to the operator. The solar panel is
normally attached to the gate opener, it should be placed where the panel receives maximum sunlight.
VISUAL FEEDBACK
The SW425 Full Systems Capability circuit board is equipped with visual feedback LEDs to simplify installation and trouble-shooting.
Located directly beside each input terminal these LEDs indicate if any input devices are active. There are also two LEDs labeled
O (opening) and C (closing) which indicate that the circuit board is delivering power to the motor to open or closed the gate.
AUTO CLOSE TIMER
The operator comes factory preset with the auto close timer function OFF. The auto close timer will close the gate automatically after a
specific amount of time has elapsed. The amount of time can be easily adjusted between 0 and 45 seconds by turning a small "pot"
located on the edge of the circuit board (page 15). The timer can be disabled or activated by flipping a single switch located on the top
edge of the circuit board. If the timer will be used it is recommended that some type of supplementary safety device (loops, photo
beam, etc.) be installed.
GATE SENSITIVITY ADJUSTMENT
The amount of force necessary to stop the gate can be adjusted to conform to the various sizes and weights of any particular gate. The
full systems capability circuit board provides separate adjustments for both the opening and closing direction. When adjusting the
sensitivity, the operator can be given only as much energy as is necessary to overcome the resistance of the gate. If the gate should
strike an obstruction either direction, the gate will reverse. If the gate should again strike an obstruction before reaching a limit, the
gate will stop and remain stopped (page 15).
MASTER AND SECOND
Some very large entrances may require the use of two gates. If this is the case, the two gates can be easily automated using the
"master and second" configuration. This configuration uses two gates and two operators in ONE driveway. The Full Systems Controller
models have terminals provided especially for master and second applications and will reliably operate simultaneously all of the time.
PULSE OPEN INPUT
The Pulse Open input feature is an open input on the circuit board which will increase the security of the SW425 gate operator system.
When an open input device such as a key switch is connected to the Pulse Open input, and the device is activated, the gate operator
will activate but will then ignore the input if the input is prolonged. What is significant about this feature is that there is the possibility
of a device being stuck and if the device is connected to the standard open input the gate will be held open. If a device is connected to
the Pulse Open input on terminals 6 and 7, the circuit board will ignore the stuck input and will allow the gate to close. For added
security any open input device may be used with Pulse Open including push buttons, key switches, numerical key pads, etc.
5
FEATURES
PERIPHERALS
POWER SUPPLY: There is 12Vdc .1 AMP available on the circuit board which is used to supply power to a radio receiver or other
device.
OPEN INPUT: Normally open devices are connected to terminals 5 and 6 on the circuit board to cause the gate to open and/or
close in PUSH-TO-OPEN/PUSH-TO-CLOSE (Timer switch OFF) mode of operation. Normally open devices are
connected to terminals 5 and 6 to cause the gate to open in AUTO CLOSE TIMER (Timer switch ON) mode of
operation. In this mode of operation the AUTO CLOSE TIMER will automatically close the gate after a specific
amount of time has elapsed. The Auto Close Timer is adjustable between 0-45 seconds. These normally open
devices can be push buttons, key switches, loop detectors, photo electric beams, 24-hour timers, etc.
PULSE OPEN INPUT: Normally open devices are connected to terminals 6 and 7 on the circuit board to cause the gate to open. Pulse
Open Input functions identical to Open Input with the exception that it will not hold open the gate. If an open
device is stuck on, the gate will still close. This feature is sometimes used to provide a higher level of security
but should be used only in addition to another open device connected to Open Input so the gate can still be
opened if necessary.
SAFETY INPUT: Normally open devices are connected to terminals 4 and 6 on the SW425 circuit board to cause the gate
operator to open and/or hold the gate open in any position except the fully closed position. Normally open
safety input devices that can be used are push buttons, radio receivers, key switches, loop detectors, photo
electric beams, 24-hour timers, etc.
N.C. STOP INPUT: Normally closed devices are connected to terminals 8 and 9 on the circuit board after removing the stop jumper
that is on terminals 8 and 9. The N.C. Stop Input will cause the gate to stop at any position and will remain
stopped until activated to open or close.
N.O. STOP INPUT: Normally open devices are connected to terminals 9 and 11 to cause the gate to stop in any position until the
gate is again activated to open or close. N.O. Stop Input functions identical to N.C. Stop input with the exception
that it requires normally open contacts instead of normally closed contacts.
CLOSE INPUT: Normally open devices are connected to terminals 9 and 10 on the circuit board to cause the gate operator to
close the gate when in any position. Normally open input devices that can be used are push buttons, radio
receivers, key switches, loop detectors, photo electric beams, 24-hour timers, etc.
continued from previous page
6
SAFETY ACCESSORY SELECTION
All UL325 compliant LiftMaster gate operators will accept external
entrapment protection devices to protect people from motorized
gate systems. UL325 requires that the type of entrapment
protection correctly matches each gate application. Below are the
six types of entrapment protection systems recognized by UL325
for use on this operator.
ENTRAPMENT PROTECTION TYPES
Type A: Inherent obstruction sensing system, self-contained
within the operator. This system must sense and initiate
the reverse of the gate within two seconds of contact
with a solid object.
Type B1: Connections provided for a non-contact device, such as
a photoelectric eye can be used as a secondary
protection.
Type B2: Connections provided for a contact sensor. A contact
device such as a gate edge can be used for secondary
protection.
Type C: Inherent adjustable clutch or pressure relief valve.
Type D: Connections provided for a control
requiring continuous pressure to
operate the operator open and close.
Type E: Built-in audio alarm. Examples
include sirens, horns or buzzers.
NOTE: UL requires that all installations must
have warning signs placed in plain view on
both sides of the gate to warn pedestrians of
the dangers of motorized gate systems.
UL325 MODEL CLASSIFICATIONS
UL325 ENTRAPMENT PROTECTION REQUIREMENTS
The chart above illustrates the entrapment protection
requirements for each of the four UL325 classes.
In order to complete a proper installation you must satisfy the
entrapment protection chart shown above. That means that
the installation must have one primary means of entrapment
protection and one independent secondary means of
entrapment protection. Both primary and secondary
entrapment protection methods must be designed, arranged
or configured to protect against entrapments in both the open
and close directions of gate travel.
For Example: For a slide gate system that is installed on a
single-family residence (UL325 Class I) you must provide the
following: As your primary type of entrapment protection you
must provide Type A inherent (built into the operator)
entrapment sensing and at least one of the following as your
secondary entrapment protection: Type B1- Non-contact
sensors such as photoelectric eyes, Type B2- Contact sensors
such as gate edges or Type D- Constant pressure control.
GATE OPERATOR ENTRAPMENT PROTECTION
Class
I & II
Class III
Class IV
A, B1, B2,
C or D
A, B1, B2,
C, D or E
A, B1, B2,
D or E
A, B1, B2
or D
A, B1 orB2A, B1, B2,
D or E
A, B1, B2
or C
A, B1, B2,
or C
A or C
B1, B2
or D
A
UL325 Slide Gate Operator Swing & Gate Barrier
Installation (Arm) Operator
Class
Primary
Type
Secondary
Type
Secondary
Type
Primary
Type
A, B1, B2,
C, D or E
CLASS I – RESIDENTIAL VEHICULAR GATE OPERATOR
A vehicular gate operator (or system) intended for use in a home of one-to four single family dwellings
or a garage or parking area associated therewith.
CLASS II – COMMERCIAL/GENERAL ACCESS VEHICULAR GATE OPERATOR
A vehicular gate operator (or system) intended for use in a commercial location or building such as a
multi-family housing unit (five or more single family units) hotel, garage, retail store or other building
servicing the general public.
CLASS III – INDUSTRIAL/LIMITED ACCESS VEHICULAR GATE OPERATOR
A vehicular gate operator (or system) intended for use in a industrial location or building such as a
factory or loading dock area or other location not intended to service the general public.
CLASS IV – RESTRICTED ACCESS VEHICULAR GATE OPERATOR
A vehicular gate operator (or system) intended for use in a guarded industrial location or building such
as an airport security area or other restricted access locations not servicing the general public, in which
unauthorized access is prevented via supervision by security personnel.
Moving Gate Can Cause
Injury or Death
KEEP CLEAR! Gate may move at any
time without prior warning.
Do not let children operate the gate or
play in the gate area.
This entrance is for vehicles only.
Pedestrians must use separate entrance
7
1.Vehicular gate systems provide convenience and security. Gate systems are comprised of many component parts. The gate
operator is only one component. Each gate system is specifically designed for an individual application.
2.Gate operating system designers, installers and users must take into account the possible hazards associated with each individual
application. Improperly designed, installed or maintained systems can create risks for the user as well as the bystander. Gate
systems design and installation must reduce public exposure to potential hazards.
3.A gate operator can create high levels of force in its function as a component part of a gate system. Therefore, safety features must
be incorporated into every design. Specific safety features include:
• Gate Edges • Guards for Exposed Rollers • Photoelectric Sensors
• Screen Mesh • Vertical Posts • Instructional and Precautionary Signage
4.Install the gate operator only when:
a. The operator is appropriate for the construction and the usage class of the gate.
b. All openings of a horizontal slide gate are guarded or screened from the bottom of the gate to a minimum of 4' (1.2 m) above
the ground to prevent a 2-1/4" (6 cm) diameter sphere from passing through the openings anywhere in the gate, and in that
portion of the adjacent fence that the gate covers in the open position.
c. All exposed pinch points are eliminated or guarded, and guarding is supplied for exposed rollers.
5.The operator is intended for installation only on gates used for vehicles. Pedestrians must be supplied with a separate access
opening. The pedestrian access opening shall be designed to promote pedestrian usage. Locate the gate such that persons will not
come in contact with the vehicular gate during the entire path of travel of the vehicular gate.
6.The gate must be installed in a location so that enough clearance is supplied between the gate and adjacent structures when
opening and closing to reduce the risk of entrapment. Swinging gates shall not open into public access areas.
7.The gate must be properly installed and work freely in both directions prior to the installation of the gate operator.
8.Controls intended for user activation must be located at least six feet (6') away from any moving part of the gate and where the
user is prevented from reaching over, under, around or through the gate to operate the controls. Outdoor or easily accessible
controls shall have a security feature to prevent unauthorized use.
9.The Stop and/or Reset (if provided separately) must be located in the line-of-sight of the gate. Activation of the reset control shall
not cause the operator to start.
10.A minimum of two (2) WARNING SIGNS shall be installed, one on each side of the gate where easily visible.
11.For a gate operator utilizing a non-contact sensor:
a. Reference owner's manual regarding placement of non-contact sensor for each type of application.
b. Care shall be exercised to reduce the risk of nuisance tripping, such as when a vehicle trips the sensor while the gate is still
moving.
c. One or more non-contact sensors shall be located where the risk of entrapment or obstruction exists, such as the perimeter
reachable by a moving gate or barrier.
12.For a gate operator utilizing a contact sensor such as an edge sensor:
a. One or more contact sensors shall be located where the risk of entrapment or obstruction exists, such as at the leading edge,
trailing edge and post mounted both inside and outside of a vehicular horizontal slide gate.
b. One or more contact sensors shall be located at the bottom edge of a vehicular vertical lift gate.
c. A hard wired contact sensor shall be located and its wiring arranged so the communication between the sensor and the gate
operator is not subject to mechanical damage.
d. A wireless contact sensor such as the one that transmits radio frequency (RF) signals to the gate operator for entrapment
protection functions shall be located where the transmission of the signals are not obstructed or impeded by building structures,
natural landscaping or similar obstruction. A wireless contact sensor shall function under the intended end-use conditions.
e. One or more contact sensors shall be located on the inside and outside leading edge of a swing gate. Additionally, if the bottom
edge of a swing gate is greater than 6" (152 mm) above the ground at any point in its arc of travel, one or more contact sensors
shall be located on the bottom edge. One or more contact sensors shall be located at the bottom edge of a vertical barrier (arm).
SAFETY INSTALLATION INFORMATION
8
STREET
Secondary
Gate Operator
Photo eye for
open cycle
Photo eye for
open cycle
Primary Gate
Operator
Photo eye for
open cycle
Interrupt
(Safety) Loop
Interrupt
(Safety) Loop
Shadow
Loop
COMPLEX
OR
PARKING LOT
4' (1.2 m)
Typical
Loop wire
layer
Seal Loops
1/4" (6 mm) or larger
depending on loop
wire size
1-1/2" (37 mm)
Run twisted wire
from loop
to operator
GATE SYSTEM (MASTER/SECOND SWING GATE)
GATE SYSTEM (COMMERCIAL SWING GATE)
1-1/2" (37 mm)
1/4" (6 mm) or larger
depending on loop
wire size
STREET
COMPLEX
OR
PARKING LOT
4' (1.2 m)
Typical
Run twisted wire
from loop
to operator
Seal Loops
Loop wire
layer
Inte
rr
upt
(S
a
fety) Loop
Inte
rr
upt
(S
afety
) Loop
Photo eye for
open cycle
Telephone
Entry System
Shadow
Loop
Photo eye for
open cycle
SUGGESTED ENTRAPMENT PROTECTION DEVICE LOCATIONS
9
WARNING SIGN PLACEMENT
The gate operator is provided with two safety warning placards.
The placards are to be installed on each side of the gate where
they are plainly visible. The placards may be mounted using sheet
metal screws through the six holes provided on each placard.
All warning signs and placards must be installed where visible in
the area of the gate.
SAFETY PRECAUTIONS FOR SWING AND ORNAMENTAL “GRILL TYPE” GATES
The primary arm is designed to clamp onto the output shaft in
such a way that the arm will slip on the shaft in the event that an
obstruction exists in the path of the gate. The bolts for securing
the primary arm should be tightened to a torque that will cause
the gate to push with minimum force. Tighten both bolts with
equal torque, then push on the end of the gate to determine the
amount of force necessary to cause the arm to slip.
To prevent SERIOUS INJURY or DEATH from a moving gate:
• Install warning signs on EACH side of gate in PLAIN VIEW.
• Permanently secure each warning sign in a suitable manner
using fastening holes.
WARNING
WARNING
To prevent SERIOUS INJURY or DEATH from a moving gate:
• Entrapment protection devices MUST be installed to protect
anyone who may come near a moving gate.
• Locate entrapment protection devices to protect in BOTH the
open and close gate cycles.
• Locate entrapment protection devices to protect between
moving gate and RIGID objects, such as posts.
• A swinging gate shall NOT open into public access ways.
WARNING
WARNING
Primary Arm
Torque
Wrench
Moving Gate Can Cause
Injury or Death
KEEP CLEAR! Gate may move at any
time without prior warning.
Do not let children operate the gate or
play in the gate area.
This entrance is for vehicles only
Pedestrians must use separate entrance
Warning Placard
Gate
Wall
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