Chamberlain LiftMaster Professional SW420 User manual

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Installation and Maintenance
Instructions
Swing Gate Operator
Model SW420

2Contents
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Contents
General Information ______________________________________________________ 4
Parts Supplied _______________________________________________________________________ 4
Model Classifications _________________________________________________________________ 4
Specifications _______________________________________________________________________ 5
Safety Information ________________________________________________________ 6
Safety Instructions____________________________________________________________________ 6
Safety Precautions for Swing Gates and Ornamental “Grill Type” Gates _________________________ 8
Preparing the Installation __________________________________________________ 9
Pre-Installation Check List _____________________________________________________________ 9
Wiring Specifications _________________________________________________________________ 9
Operator Preparation _________________________________________________________________ 10
Installation _____________________________________________________________ 11
Post Mount Installation _______________________________________________________________ 11
Pad Mount Installation _______________________________________________________________ 13
Pedestal Mount Installation____________________________________________________________ 14
Control Arm Assembly _______________________________________________________________ 15
System Features _________________________________________________________ 17
Visible/Audible Devices ______________________________________________________________ 17
Single/Three Button Controls and the Microprocessor_______________________________________ 17
Obstruction Sensing _________________________________________________________________ 18
Circuitry __________________________________________________________________________ 18
Programming ___________________________________________________________ 19
Switch #1: Operator Programming ______________________________________________________ 19
Switch #2: Timer to Close_____________________________________________________________ 20
Limit Switch Adjustments _________________________________________________ 21
Controls and Accessory Installation _________________________________________ 24
Manual Operation _______________________________________________________ 25
Required Maintenance____________________________________________________ 26
Troubleshooting _________________________________________________________ 27

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1. Power___________________________________________________________________________ 27
2. Accessories ______________________________________________________________________ 28
3. Primary Voltage Circuit ____________________________________________________________ 28
4. Low Voltage Circuit _______________________________________________________________ 29
5. Gear Reducer_____________________________________________________________________ 30
General Reference Information_________________________________________________________ 30
Features and Program Troubleshooting review ____________________________________________ 30
Parts List – SW420 _______________________________________________________ 31
Warranty Policy__________________________________________________________ 33
IMPORTANT!
Please leave this manual at the job site, preferably with the end user or facility manager. Read
and follow all instructions.
This gate operator is intended for use on a gate that swings in an arc in a horizontal plane.

4General Information
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General Information
Parts Supplied
There are two cartons for the standard model SW420. The large carton contains the powerhead unit
and small parts. The long thin carton contains the two pieces of the control arm. In addition, if the
pedestal mount option was ordered, a third carton containing the pedestal and associated hardware is
included.
Unpack the cartons, checking for possible damage during shipping. Damage claims must be filed with
the freight carrier.
PART # DESCRIPTION QTY. PART # DESCRIPTION QTY.
SW420 Power Unit 1
80-206-65 5/8 Washer 2
02-041-SP Stop Button 1 80-10026 3/8 Spacer 2
07-2703 Control Arm 1 82-HN38-16 3/8-16 x 1” Bolt 1
07-2704 Arm Extension 1 82-HN38-18 3/8-16 x 1-1/4” Bolt 2
40-3505 Warning Sign 2 82-SH37-10 3/8-24 x 5/8 Capscrew 1
07-2705 Arm Stop 1 84-WH-38 3/8-16 Nut 2
10-2111 Gate Bracket 1 85-FW-38S 3/8 Flat Washer 1
11-2754 U-Bolt Nut Tool 1 80-2754 U-Bolt Nut 2
12-2727 Flange Bushing 3
Table 1: Parts Supplied
Model Classifications
RESIDENTIAL VEHICULARGATE
OPERATOR – CLASS 1
A vehicular gate operator or system that is
intended for use in a home of one to four single
family dwelling or a garage or parking area.
INDUSTRIAL/LIMITED ACCESS
VEHICULAR GATE OPERATOR – CLASS 3
A vehicular gate operator or system intended for
use in an industrial location or building such as a
factory or loading dock area or other locations not
intended to service the general public.
COMMERCIAL/GENERAL ACCESS
VEHICULAR GATE OPERATOR – CLASS 2
A vehicular gate operator or system intended for
use in a commercial location or building such as a
multi-family housing unit of five or more single
family units, hotel, garages, retail store, or other
building servicing the general public.
RESTRICTED ACCESS VEHICULAR GATE
OPERATOR – CLASS 4
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 location not servicing the general public,
in which unauthorized access is prevented via
supervision by security personnel.
MODEL CLASS 1 CLASS 2 CLASS 3 CLASS 4
SW420 
Table 2

General Information 5
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Specifications
Power: 115vac. Or 230vac. 60 hz.
6.5 amps @ 115v.
3.3 amps @ 230v.
Motor: Perm. Split cap.
Speed – 1000 rpm
Current – 5.2A @ 115v.
2.6A @ 230v.
Overload: Automatic resetting
thermal.
Gate Travel: Adjustable to 105
degrees.
Gate Speed: Opens in 12 seconds.
RECOMMENDED CAPACITIES
HP GATE WT. GATE WIDTH MAX. STARTS/HR.
1/3 300 lbs. 12 ft. 10
Table 3
01-G0610F2
Figure 1

6Safety Information
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Safety Information
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. 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.
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 Enclosed Track Vertical Posts
Guards for exposed
rollers
Photo-electric Sensors Instructional and
Precautionary Signage
Screen Mesh
Important instructions follow. 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.
Safety Instructions
Selected Instructions are highlighted with a precautionary symbol (see left margin). Failure to follow
these selected instructions can result in serious injury or death.
STEP 1: BEFORE INSTALLATION
1 Confirm gate operator model is specified by Installation and Maintenance Manual for
application type, gate size and frequency of use.
2 Confirm ALL appropriate safety features, such as gate edges, photo-electric sensors,
vertical posts and enclosed tracks, are specified.
3 Confirm the gate system design reduces pinch points and protects against entrapment.
4 Confirm gate system design has pedestrian access separate from vehicular entrance.
5 Confirm gate system design reduces traffic backup.
6 Confirm warning signage is included in design.
7 Confirm gate moves freely before installation of operator.
8 Repair or service worn or damaged gate hardware before installation of operator.
9 To avoid installation hazards, review the gate system operation and installation
procedures, such as manual disconnect mechanism procedure.
10 Confirm control design prohibits unauthorized use.
STEP 2: DURING INSTALLATION
1 Disconnect power at service panel before making any electrical connection.
2 Avoid pinch points; be aware of all moving parts.

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3 Adjust clutch or load sensing device to minimum force setting.
4 Do not overtighten clutch or adjust force setting above minimum.
5 Install controls where user cannot touch gate while operating controls.
6 Install two or more warning signs on the gate to alert persons in the area of automatic
gate operation. Warning signs must be conspicuous.
7 Install operator inside fence line. DO NOT install operator on public side of fence line.
8 Secure gate operator cover.
STEP 3: AFTER INSTALLATION
1 Test all safety features.
2 Train end user about basic functions and safety features of gate system.
3 Leave Installation and Maintenance Manual and Safety Information with end user.
FOR GATE OPERATORS USING NON-CONTACT SENSOR(S)
See instruction supplied with sensor for proper placement.
Precautions must be taken to reduce the risk of nuisance tripping of the sensor.
If there are multiple areas of risk of entrapment or obstruction, then more than one sensor
should be incorporated into the system.
FOR GATE OPERATORS USING CONTACT SENSOR(S)
One or more sensors shall be located as shown on page 8.
Care must be taken during the wiring of the sensor(s) to the operator. Make sure that the
wiring cannot be damaged or interrupted.
When using a sensor with a gate edge transmitter, care must be taken to insure that the
RF signal is not interfered with or obstructed.
SECONDARY ENTRAPMENT PROTECTION
It is recommended that secondary safeties always be used for both the open and close directions.
Use photo eyes, safety edges or both. In any case, the device must sense people. Loops cannot
be used.

8Safety Information
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Safety Precautions for Swing Gates and Ornamental “Grill Type”
Gates
ENTRAPMENT ZONES
Pedestrians must stay clear of the gate path, particularly the area where the gate can trap them,
as shown in Figure 2.
01-G0610F3
Figure 2
Gate edges and/or photo-electric beams must be incorporated into the swing gate system to assist
in the protection of people who may come near the gate operating system.
Also, injuries can occur when people put their hands and arms through openings in a grill type
gate and it is operated. This potential hazard can be averted by placing a screen mesh on the
gate to prevent access through the openings. See Figure 3.
Photo-Electric Beam
Screen Mesh
Gate Edge
01-G0610F4
Gate Ed
g
e on Leadin
g
Ed
g
e of Gates
Always test Gate Edges and
Photo Beams anytime they are
adjusted or serviced.
Figure 3

Preparing the Installation 9
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Preparing the Installation
Pre-Installation Check List
 Check the gate. It MUST operate smoothly and freely. If necessary, lubricate the hinges, adjust
or repair the gate prior to operator installation. The gate MUST be level.
 Double check the size and weight of the gate to make sure that it is proper for this application.
 If wiring has already been installed, check to make sure it meets the following specifications.
Wiring Specifications
A. The distances shown are measured in
feet from the operator to the power
source.
B. These calculations are based on the
National Electrical Code and allows for a
5% voltage drop.
C. Supply voltage must be within 10% of the
operator’s rating under load conditions.
D. These calculations are based on stranded
copper wire.
E. It is highly recommended that only 90% of
the distances shown be used; this will
allow for a 10% safety factor.
F. For dual units, the distance shown should
be cut in half.
G. When wire larger than 12 gauge is used, a
separate junction box will be required for
operator power connections. Not supplied.
H. All local codes must be strictly adhered
to. It is very important that operator is
properly grounded.
I. Do not run control wires in the same conduit
with power wires.
J. Do not run multi conductor or parallel
conductor cable for controls.
K. All power wiring should be dedicated and
protected.
SINGLE PHASE CONTROL WIRING
WIRE GAUGE H.P. 115VAC. 230VAC. VOLT MAX.
DISTANCE
WIRE
GUAGE
6 1/3 684 ft. 3,077 ft.
8 1/3 432 ft. 1,942 ft.
10 1/3 271 ft. 1,218 ft.
12 1/3 170 ft. 763 ft.
24 1000 18
Table 4: Power and Control Wiring Chart
NOTE: Calculated using NEC guidelines. Local codes and conditions must be reviewed for
suitability of wire installation. Master/Slave units must be installed on separate circuits.

10 Preparing the Installation
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Operator Preparation
1 Open the service cover on the operator by removing 6 screws and pulling down and out.
Inside you will find the electrical enclosure stored vertically. All the electrical connections for
controls that the installer needs are provided here on the electrical box.
2 To service the solid state controller or other components of the electrical box, slide the
electrical box out, then pivot down.
3 Remove 1 screw securing the electrical box cover.
CAUTION
Never remove cover of high voltage compartment unless power is off. Electric shock
and serious injury could result.
The S3 PCB is the major component of the electrical box and settings can be made by
changing the two dip switches. There is mixed voltage in this box, both line voltage, and
control voltage 24 VAC.
4 Select the preferred method of electrical wire entry. The SW420 is provided with (6) holes in
the bottom of the chassis for electrical entry. Power supply wiring will be routed to the large
double gang electrical box on the left side of the operator.
Wire Nut
Connections
Cover
Line Connector
01-G0610F5
Controls and
Accessories
Figure 4