Chamberlain HD420EVP User manual

The Chamberlain Group, Inc.
845 Larch Avenue
Elmhurst, Illinois 60126-1196
www.chamberlain.com
CONTENTS
Preparation .............................. 1-4
Assembly................................. 5-9
Installation............................ 10-19
Install the Door Control ............. 20-21
Install the Protector System®...... 22-25
Power.................................. 26-27
Adjustments .......................... 28-30
Operation.................................. 31
Features................................... 32
Door Control .......................... 33-34
Remote Control ...................... 34-35
To Erase the Memory.................... 35
To Open the Door Manually ............ 36
Maintenance.............................. 37
Troubleshooting...................... 38-39
Accessories............................... 40
Warranty .................................. 41
Repair Parts .......................... 42-43
1/2 hp Chain Drive
Garage Door Opener
■ Please read this manual and the enclosed safety materials carefully!
■Fasten the manual near the garage door after installation.
■ The door WILL NOT CLOSE unless the Protector System®is connected and
properly aligned.
■Periodic checks of the garage door opener are required to ensure safe operation.
■The model number label is located on the left side panel of your garage
door opener.
■This garage door opener is compatible with MyQ®and Security✚2.0™ accessories.
■ DO NOT install on a one-piece door if using devices or features providing unattended
close. Unattended devices and features are to be used ONLY with sectional doors.
Serial Number:
Date of Purchase:
Model Number:
Model HD420EVP
FOR RESIDENTIAL USE ONLY
Write down the following information
for future reference:
.
.

1
Safety Symbol and Signal Word Review
This garage door opener has been designed and tested to offer safe service provided it isinstalled,
operated,maintained and tested in strictaccordance with the instructions and warningscontained in this
manual.
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 ifyou do notcomply with the warnings that accompany them.The
hazard may come from something mechanical or from electric shock.Read the warnings carefully.
Mechanical
Electrical
When you see this Signal Word on the following pages,it will alert you to the possibilityof damage to
your garage door and/or the garage door opener if you do not complywith the cautionary statementsthat
accompany it. Read them carefully.
Unattended Operation
The Timer-to-Close (TTC) feature, the MyQ®Smartphone Control app, and MyQ®Garage Door and
Gate Monitor are examples of unattended close and are to be used ONLY with sectional doors .Any
device or feature that allowsthe door to close without being in the line ofsight ofthe door isconsidered
unattended close.The Timer-to-Close (TTC) feature, the MyQ®Smartphone Control,and anyother
MyQ®devices are to be used ONLY with sectional doors.
Check the Door
To prevent possible SERIOUS INJURY or DEATH:
lALWAYS call a trained door systems technician if garage door binds, sticks, or is out of balance.
An unbalanced garage door may NOTreverse when required.
lNEVER try to loosen, move or adjust garage door, door springs, cables, pulleys, brackets or their
hardware,ALL of which are under EXTREME tension.
lDisable ALL locksand remove ALL ropes connected to garage door BEFORE installation and
operating garage door opener to avoid entanglement.
lDO NOT install on a one-piece door ifusing devices or features providing unattended close.
Unattended devices and features are to be used ONLY with sectional doors.
To preventdamage to garage door and opener:
lALWAYS disable locks BEFORE installing and operating the opener.
lONLY operate garage door opener at120 V,60 Hzto avoid malfunction and damage.
Before you begin:
1. Disable locksand remove any ropes connected to the garage door.
2. Lift the door halfway up. Release the door. If balanced, it should stay
in place, supported entirely by its springs.
3. Raise and lower the door to checkfor binding or sticking. If your door
binds, sticks, or is out of balance, call a trained door systems
technician.
4. Check the seal on the bottom of the door.Any gap between the floor
and the bottom of the door mustnotexceed 1/4 inch (6 mm).
Otherwise, the safety reversal system may not work properly.
5. The opener should be installed above the center ofthe door. If there
is a torsion spring or center bearing plate in the way ofthe header
bracket, it may be installed within 4feet (1.2 m) to the leftor right of
the door center. See page11.
Torsion
Spring
Extension
Spring
OR
Preparation

2
Additional Items You May Need:
Survey your garage area to see if you will need any ofthe following items:
n(2) 2X4 PIECES OF WOOD
Maybe used to fasten the header bracket to the structural supports.Also used to position the
garage door opener during installation and for testing the safety reversing sensors.
nSUPPORT BRACKET AND FASTENING HARDWARE
Mustbe used ifyou have a finished ceiling in your garage.
nEXTENSION BRACKETS (MODEL 041A5281-1) OR WOOD BLOCKS
Depending upon garage construction, extension brackets or wood blocksmay be needed to
install the safety reversing sensor.
nFASTENING HARDWARE
Alternate floor mounting of the safetyreversing sensor will require hardware not provided.
nOUTSIDE QUICK RELEASE (MODEL 7702CB)
Required for a garage with NO access door.
nDOOR REINFORCEMENT
Required if you have a lightweight steel, aluminum, fiberglass or glass panel door.
nRAIL EXTENSION KIT
Required ifyour garage door is more than 7 feet (2.13 m) high.
Tools Needed
3/16
7/16
1/2
5/32
5/16
5/8
9/16
1/4
7/16
Preparation

3
Carton Inventory
Your garage door opener ispackaged in one carton which contains the motor unit and all parts
illustrated below.Accessoriesvarydepending on the garage door opener model purchased.Depending
on your model, other accessories may be included with your garage door opener. Instructions for these
accessories will be attached to the accessory and are not included in this manual. Save the carton and
packing material until the installation and adjustment is complete. The images throughout this manual
are for reference only and your product may look different.
A. Header bracket
B. Pulley
C. Door bracket
D. Curved door arm
E. Straight door arm (Packaged inside front rail section)
F. Trolley
NOTE: Be sure to assemble the trolley before sliding onto rail.
G. Emergency release rope and handle
H. Rail (1 front and 4 center sections)
I. Hanging brackets(2) (Packaged inside the front rail section)
J. Garage door opener (motor unit)
K. Chain spreader with screws
L. “U” bracket
M. Chain and cable
N. Door control
O. Remote control
P. The Protector System®
Safety reversing sensors with 2 conductor white and white/blackwire attached:Sending Sensor
(1), Receiving Sensor (1), and Safety Sensor Brackets (2)
NOT SHOWN
White and red/white wire
Owner's manual
Hardware
N
A
B
C
H
K
J
O
I
D
E
F
G
L
M
P
Preparation

4
Hardware
Bolt
1/4"-20x1-3/4"
Lock Nut
1/4"-20
Bolt
Nut 3/8" Lock Washer 3/8"
Master Link
Clevis Pin 5/16"x1-1/2"
Ring Fastener (3)
Hex Bolt 5/16"-18x7/8" (4)
Lock Washer
5/16"-18 (5)
Nut
5/16"-18 (6)
Self-Threading Screw
1/4"-14x5/8" (2)
Clevis Pin 5/16"x1"
Clevis Pin 5/16"x1-1/4"
Carriage Bolt
1/4"-20x1/2" (2)
Wing Nut 1/4"-20 (2)
ASSEMBLY INSTALLATION
Screw 6ABx1" (2)
Drywall Anchors (2)
Screw 6-32x1" (2)
DOOR CONTROL
Insulated
Staples
(Not Shown)
Lag Screw 5/16"-9x1-5/8" (4)
Threaded
Shaft
Preparation

5
Assembly
STEP 1 Assemble the rail and install the trolley
To prevent INJURY from pinching, keep handsand fingers away from the joints while assembling the
rail.
To avoid installation difficulties, do not run the garage door opener until instructed to do so.
The front rail has a cut out “window” at the door end. The rail tab MUST be on top of the rail when
assembled.
1. Remove the straightdoor arm and hanging bracket packaged inside the frontrail and setaside
for Installation Step 5 and 9. NOTE: To prevent INJURY while unpacking the rail carefully remove
the straight door arm stored within the rail section.
2. Align the rail sectionson a flat surface asshown and slide the tapered endsinto the larger ones.
Tabsalong the side will lockinto place.
3. Place the motor unit on packing material to protectthe cover, and rest the backend of the rail on
top. For convenience, puta support under the frontend of the rail.
4. As a temporary stop, insert a screwdriver into the hole in the second rail section from the motor
unit, as shown.
5. Check to be sure there are 4 plastic wear padsinside the inner trolley. If they became loose
during shipping, check all packing material. Snap them back into position as shown.
6. Slide the trolley assembly toward the screwdriver asshown.
7. Slide the rail onto the “U” bracket, until itreaches all the stops on the top and sidesofthe “U”
bracket.
To garage
door opener
(TO MOTOR UNIT)
Front Rail
Section
(TO DOOR)
“U” Bracket
Outer Trolley
Inner Trolley
Wear Pads
SLIDE TO STOPS
ON TOP AND
SIDES OF
“U” BRACKET
Trolley
Rail Tab

6
Assembly
STEP 2 Fasten the rail to the motor unit
To avoid SERIOUS damage to garage door opener,use ONLY those bolts/fastenersmounted in the
top ofthe opener.
1. Insert a 1/4"-20x1-3/4" boltinto the cover protection bolthole on the backend ofthe rail as
shown. Tighten securelywith a 1/4"-20 lock nut.DO NOT overtighten.
2. Remove the boltsfrom the top of the motor unit.
3. Use the carton to support the front end of the rail.
4. Place the “U” bracket,flat side down onto the motor unit and align the bracket holes with the bolt
holes.
5. Fasten the “U” bracket with the previously removed bolts; DO NOT use any power tools.The use
ofpower tools maypermanentlydamage the garage door opener.
6. Attach chain spreader to the motor unit with two screws.
HARDWARE
Bolt 1/4"-20x1-3/4" Lock Nut 1/4"-20
“U” Bracket
Hex Screws
8-32x7/16
SLIDE RAIL TO
STOPS ON TOP AND
SIDES
Cover
Protection
Bolt Hole
Bolt 1/4"-20x1-3/4"
Lock Nut 1/4"-20
Bolts (Mounted in the
garage door opener) Chain
Spreader

7
Assembly
STEP 3 Install the idler pulley
1. Lay the chain/cable beside the rail, asshown. Grasp the end of the cable and pass
approximately 12" (30 cm) ofcable through the window.Allow itto hang until Assembly Step 4.
2. Remove the tape from the idler pulley.The inside center should be pre-greased. Ifdry,regrease
to ensure proper operation.
3. Place the idler pulleyinto the window asshown.
4. Insert the idler bolt from the top through the rail and pulley.Tighten with a 3/8" lock washer and
nut underneath the rail until the lock washer is compressed.
5. Rotate the pulley to be sure it spins freely.
6. Locate the rail tab. The rail tab is near the idler pulley on the frontrail section. Use a flathead
screwdriver and liftthe rail tab until the tab is vertical (90º).
HARDWARE
Bolt Nut 3/8"
Lock Washer 3/8"
Rail
Idler Pulley
Grease Inside Pulley
Bolt
Lock Washer 3/8"
Nut 3/8"
Rail
Tab
CORRECT
INCORRECT
Rail Tab

8
Assembly
STEP 4 Install the chain
To avoid possible SERIOUS INJURY to finger from moving garage door opener:
lALWAYS keep hand clear of sprocketwhile operating opener.
lSecurelyattach chain spreader BEFORE operating.
1. Pull the cable around the idler pulley and toward the trolley.
2. Connectthe cable to the retaining slot on the trolley, as shown.(Figure 1)
a. Push pins of master link bar through cable link and trolley slot.
b. Push master link cap over pins and past pin notches.
c. Slide the closed end ofthe clip-on spring over one of the pins. Push the open end of the
clip-on spring onto the other pin.
3. With the trolleyagainst the screwdriver, dispense the remainder of the cable/chain along the rail
toward the motor unitaround the sprocket and continuing to the trolley assembly.The sprocket
teeth must engage the chain. (Figure 2)
4. Check to make sure the chain isnot twisted, then connect it to the threaded shaftwith the
remaining master link.
5. Thread the inner nut and lockwasher onto the trolley threaded shaft.
6. Insert the trolley threaded shaftthrough the hole in the trolley.Be sure the chain is not twisted.
(Figure 3)
7. Loosely thread the outer nut onto the trolley threaded shaft.
8. Remove the screwdriver.
HARDWARE
Master
Link
Threaded Shaft
Figure 3
Threaded
Shaft
Outer
Nut
Inner
Nut
Lock
Washer
Master Link
Master
Link
Figure 2
Sprocket
Figure 1
a.
b.
c.

9
Assembly
STEP 5 Tighten the chain
1. Spin the inner nut and lock washer down the trolleythreaded shaft, away from the trolley.
2. To tighten the chain, turn the outer nut in the direction shown.
3. When the chain is approximately 1/4" (6 mm) above the base ofthe rail atit's midpoint, retighten
the inner nut to secure the adjustment.
Sprocket noise can resultif the chain is too loose.When installation is complete,you may notice some
chain droop with the door closed. This is normal.Ifthe chain returnsto the position shown when the door
is open, do not re-adjust the chain.
NOTE: During future maintenance, ALWAYS pull the emergency release handle to disconnect the
trolley before adjusting the chain.
You have now finished assembling your garage door opener. Please read the following warnings
before proceeding to the installation section.
Outer
Nut
Lock
Washer
Trolley
Threaded
Shaft
Inner Nut
To Tighten
Inner Nut
To Tighten Outer Nut
Base of Rail Mid length of Rail
Chain
1/4" (6 mm)