Lift-Master SW420 User Manual
CONTROLLER BOARD
Serial # ________________________
(located on electrical box cover)
Installation Date __________________
2 YEAR WARRANTY
MODEL SW420 IS FOR VEHICULAR PASSAGE GATES ONLY AND IS
NOT INTENDED FOR PEDESTRIAN PASSAGE GATE USE
MODEL SW420
LIGHT DUTY SWING GATE OPERATOR
GL
2
OPERATOR SPECIFICATIONS
Carton Inventory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Gate Weight Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Operator Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Model Classifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
OPERATOR WARNINGS
Gate System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Safety Installation Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Safety Label Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Safety for Swing & Ornamental Grill Type Gates . . . . . . . . . . . . . . . . . .8
OPERATOR MOUNTING
Post Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Pad Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Pedestal Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
MECHANICAL OPERATOR FEATURES
Control Arm Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Mechanical Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
OPERATOR WIRING & PROGRAMMING
Install Power Wiring & Control Station . . . . . . . . . . . . . . . . . . . . . . . . .14
Wiring Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Disconnect Switch Power Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Stop/Reset Button Control Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Programming The Radio Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Limit Switch Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
SAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Optional Control Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19-20
Control Board Illustrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Controller Programming and Features . . . . . . . . . . . . . . . . . . . . . . . . .22
Program Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23-24
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25-26
Hall Effect Sensor Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Operator Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Repair Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Illustrated Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Single Phase Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32-34
Warranty Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Control Connection Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
TABLE OF CONTENTS
IMPORTANT NOTE
• BEFORE attempting to install, operate or maintain the operator,
you MUST read and fully understand this manual and follow all
safety instructions.
• These instructions are intended to highlight certain safety related
issues. These instructions are not intended to be comprehensive.
Because each application is unique, it is the responsibility of the
purchaser, designer, installer and end user to ensure that the total
gate system is safe for its intended use.
CARTON INVENTORY
Before beginning your installation check that all components were
supplied and received undamaged. Refer to list below for factory
supplied parts.
Part No. Description Qty.
01-G0582 Safety Gate Brochure 1
02-401-SP Stop Button 1
07-2705 Arm Stop 1
10-2111 Gate Bracket 1
11-2754 U-Bolt Nut Tool 1
12-2727 Bushing 3/8" 3
40-3505 Warning Sign 2
80-10026 Washer, Shim 3/8" 2
80-206-65 Spacer 4
80-2754 U-Bolt Nut 2
82-HN38-16 Bolt 3/8-16 x 1" 1
82-HN38-18 Hex Head Bolt 3/8-16 2
82-SH37-10 Socket Head Bolt 3/8-24 1
85-FW-38S Flat Washer 3/8" 1
HARDWARE KIT
SW420 (K77-SW420)
WARNING
WARNING
WARNING
WARNING
CAUTION
WARNING
WARNING
Mechanical
Electrical
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.
3
MODEL 420
HP
1/3
GATE WT.
300 LBS.
GATE WIDTH
12 FT.
MAX. STARTS/HR
10
GATE WEIGHT SPECIFICATIONS
OPERATOR DIMENSIONS
1-3/8"
11-3/4"
18-3/16"
Post Mount
(standard)
11-5/8"
3-3/16"
3" (Nominal)
14-5/8"
11-3/4"
12" Max.
1.38
1.38
18-3/16"
18-3/16"
Pad Mount
(optional)
Pedestal
Mount
(optional)
11-5/8"
3-3/16"
5/8"
11-5/8"
3-3/16"
1-1/2"
4
MODEL
SW420
CLASS 1 CLASS 2
CLASS 3
CLASS 4
✔✔✔✔
NOTE: Model SW420 meets the following specifications
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.
UL325 MODEL CLASSIFICATIONS
5
This document is current with the UL325 specification at the time of printing. However please check the most current version of UL325 for update
information.
UL325 MODEL CLASSIFICATIONS continued
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 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 photo 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. Many
signs and labels are included with each
operator.
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 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 photo-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, C
or D
A, B1, C,
D or E
A, B1, B2,
D or E
A, B1, B2
or D
A, B1, B2
or B2
A, B1,
D or E
A, B1, C
or C
A, B1, C,
or D, B2
A or C
B1, B2
or D
A
UL325 Slide Gate Operator Swing & Gate Barrier
Installation (Arm) Operator
Class
Primary
Type
Secondary
Typ e
Secondary
Type
Primary
Type
D or E
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
6
* REFER TO LOOP MANUFACTURER’S INSTRUCTIONS FOR DETAILED INSTALLATION & LOOP WIRING INSTRUCTIONS.
GATE SYSTEMS
MASTER/SECOND SWING GATE
COMMERCIAL SWING GATE
STREET
Interrupt
Loop
Telephone
Entry
System
Photo eye for
open cycle
Run twisted wire
from loop
to operator
Seal Loops
Photo eye for
open cycle
STREET
Interrupt
Loop
Shadow
Loop
4'
Typical
Interrupt
Loop
Photo eye for
open cycle
COMPLEX
OR
PARKING LOT
Master
Unit
1-1/2"
Loop wire
layer
1/4" or larger
depending on loop
wire size
Run twisted wire
from loop
to operator
Seal Loops
Second
Unit
Photo eye for
open cycle
Photo eye for
open cycle
Shadow
Loop
Typical
Interrupt
Loop
4'
COMPLEX
OR
PARKING LOT
1-1/2"
Loop wire
layer
1/4" or larger
depending on loop
wire size
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
• Enclosed Track • 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 swing 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" (57.15 mm) 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.
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 must be far enough from the gate so that the user is prevented from coming in contact with the gate while operating the
controls.
9. Controls intended to be used to reset an operator after 2 sequential activations of the entrapment protection device or devices
must be located in the line of sight of the gate, or easily accessible controls shall have a security feature to prevent unauthorized
use.
10. All warning signs must be installed where visible, on each side of the gate.
11. For a gate operator utilizing a non-contact sensor:
a. See instructions on the 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 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. One or more contact sensors shall be located at the pinch point of a vehicular vertical pivot gate. Additionally, if the bottom
edge of a swing gate is greater than 6" (152mm) above the ground at any point in its arc of travel, one or more contact sensors
shall be located on the bottom edge.
d. 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.
e. 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.
SAFETY INSTALLATION INFORMATION
8
Injuries can occur when pedestrians stand in the path of a moving gate, or in their entrapment zones. Non-contact sensors,
such a photo eyes, must be incorporated into the swing gate system to assist in the protection of people who may come
near the gate operating system. Gate edges maybe used as additional entrapment protective devices.
UL325 requires that, when used, contact sensors shall be located so that they protect against entrapment during both open
and close gate cycles.
The UL required Warning Signs must be installed in plain view and on both sides of each gate installed. Each sign is made
with fastening holes in each corner and should be permanently secured in a suitable manner. Warning label on unit should
be visible.
Injuries occur when people are caught between a moving gate or a rigid object such as a stationary fence post or fence
(See Safety Brochure for details).
SAFETY LABEL PLACEMENT
SAFETY PRECAUTIONS FOR SWING & ORNAMENT “GRILL TYPE” GATES
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
01-G0665F18
NOTE: For the following instructions refer to Figures 1 & 2.
1. Locate and anchor two posts made of 3" outer diameter heavy
walled pipe. Posts should be parallel and square to the gate.
IMPORTANT NOTE: The distance between mounting posts and the
relative location of the operator to the gate and fence is critical.
2. Locate electrical conduit, as required, prior to pouring concrete.
3. Locate post mount holes on each end of the cabinet. There are (3)
sets of holes vertically.
The preferred method of post mounting is to use the (2) sets of holes
nearest to the rear side of the cabinet. Knock out the post mount holes
that have been selected.
NOTE: The preferred method of post mounting is to use the (2) sets of
holes nearest to the rear side of the cabinet. If mentioned holes are
used, the upper rear holes are larger than the other holes. This is
because a special nut is required for the U-bolt in these holes due to an
inaccessibility of tools inside the cabinet in the area of these holes.
4. Insert the U-bolt Nut (80-22754) through the cabinet wall from the
inside and onto the leg of the U-Bolt. This nut can be tightened with a
wrench from outside the cabinet. A special tool is provided for this
purpose.
Figure 1
Figure 2
POST MOUNTING
9
Gate
Gate
Pivot
Pivot
5-3/8"
11"
3"
Parallel Mount
16"
18-1/4"
Fence Line
28"
21-1/4"
3" Pipe
18 1/4"
Fence Line
17-3/8"
21-1/4"
3" U-bolt
(4 required)
Perpendicular Mount
Use tool provided
(11-2754) to insert
special nut in rear
holes.
Rear of cabinet
Special Nut
Power and control wiring
should be run in separate conduit
10
NOTE: For the following instructions refer to Figures 1 & 2.
1. Layout the concrete pad as detailed in Figure 1.
IMPORTANT NOTE: The relative location of the operator to the fence
and the gate is critical. Be sure that the measurements for operator
mounting are taken from the centerline of the fence and of the gate
hinge.
2. Locate electrical conduit, as required, prior to pouring concrete.
3. Pour concrete pad.
4. Bolt the (2) pad mount brackets to the bottom of the operator with the
hardware provided.
5. Secure the operator to the pad. It is very important that the operator
be level and square to the gate.
Figure 1
Figure 2
PAD MOUNTING
Pivot
Gate
18"x30" Pad
Minimum
1/2" red head bolts
or anchors
Pivot
Gate
Fence Line
6-1/2"
19"
26-3/4"
6"
Parallel Mount
Fence Line
14-3/4"
6"
18-1/2"
19"
Perpendicular Mount
Using suitable
hardware secure
operator to L-bolts
1/2" concrete anchoring
bolts (4 required)
Power and control wiring
should be run in seperate conduit
Concrete Pad
2" to 4"
above grade
Depth required
by local codes or
below frost line
Hardware
Typ. (6X)
Pad Mount Bracket
11
NOTE: For the following instructions refer to Figures 1 & 2.
1. Locate and anchor pedestal. Pedestal should be parallel and square
to the gate.
IMPORTANT NOTE: The distance between mounting pedestal and the
relative location of the operator to the gate and fence is critical.
2. Locate electrical conduit, as required, prior to pouring concrete.
3. Bolt the mounting brackets to the pedestal.
4. Secure the operator to the pedestal by dropping it onto the pedestal
and allowing the mounting studs to slip through the holes on the
pedestal brackets. Secure with hex nuts provided.
Figure 1
Figure 2
PEDESTAL MOUNTING
Pivot
Gate
Pivot
Gate
Pedestal 24" deep
in-ground minimum
Hinge Pin
14"
Fence Line
26"
Parallel Mount
Hinge Pin
14"
Fence Line
26"
Perpendicular Mount
Pedestal mount
Kit 65RSWP
Power and control wiring
should be run in seperate conduit
Concrete Pad
2" to 4"
above grade
Depth required
by local codes or
below frost line
Nut Typ. (8x)
Bolt typ. (4x) from
bracket to pedestal
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