Chamberlain HD520EV User manual

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 ............ 35
Maintenance.............................. 36
Troubleshooting...................... 37-38
Accessories............................... 39
Warranty .................................. 40
Repair Parts .......................... 41-42
1/2 hp Belt 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 enable the Timer-to-Close feature if you are installing the garage door
opener on a one-piece door. The Timer-to-Close is to be used ONLY with sectional
doors.
Serial Number:
Date of Purchase:
Model HD520EV
FOR RESIDENTIAL USE ONLY
Write down the following information
for future reference:
.
.
The Chamberlain Group, Inc.
845 Larch Avenue
Elmhurst, Illinois 60126-1196

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 warnings contained 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 accompanythem.The
hazard may come from something mechanical or from electric shock. Read the warningscarefully.
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 ifyou do notcomplywith the cautionarystatementsthat
accompany it. Read them carefully.
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 NOT reverse 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 locks and remove ALL ropes connected to garage door BEFORE installation and
operating garage door opener to avoid entanglement.
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 locks and remove any ropesconnected 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 ofthe door.Any gap between the floor
and the bottomof 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 wayof the header
bracket, it may be installed within 4feet (1.2 m) to the left or right of
the door center. See page11.
Torsion
Spring
Extension
Spring
OR
Preparation

2
Additional Items You May Need:
Surveyyour garage area to see ifyou will need any of the 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
Must be used if you 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 safety reversing sensor will require hardware not provided.
nOUTSIDE QUICK RELEASE (MODEL 7702CB)
Required for a garage with NO accessdoor.
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
2
1
3/16
7/16
1/2
7/32
5/16
3/8 7/16
1/2
Preparation

3
Carton Inventory
Your garage door opener ispackaged in one carton which contains the motor unit and all parts
illustrated below.Accessories vary depending on the garage door opener model purchased.Depending
on your model, other accessoriesmay be included with your garage door opener. Instructions for these
accessorieswill be attached to the accessory and are not included in this manual.Ifanything ismissing,
carefully checkthe packing material. Hardware for assembly and installation is shown on the nextpage.
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. Sprocket cover and screws
L. “U” bracket
M. Belt
N. Door control
O. Remote control
P. The Protector System®
Safety reversing sensorswith 2 conductor white and white/black wire attached: Sending Sensor
(1), Receiving Sensor (1), and Safety Sensor Brackets (2)
NOT SHOWN
White and red/white wire
Owner's manual
Preparation

4
Hardware Inventory
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 HARDWARE INSTALLATION HARDWARE
Screw 6ABx1" (2)
Drywall Anchors (2)
Screw 6-32x1" (2)
DOOR CONTROL HARDWARE
Insulated
Staples
(Not Shown)
Lag Screw 5/16"-9x1-5/8" (4)
Hex Screw
#8x3/8" (2)
(packed with the
sprocket cover)
Bolt
1/4"-20x1-3/4"
Lock Nut
1/4"-20
Bolt
Nut 3/8"
Lock Washer 3/8"
Master Link
Spring
Trolley Nut
Threaded
Shaft
with
Preparation

5
Assembly
STEP 1 Assemble the rail and install the trolley
To prevent INJURY from pinching,keep hands and 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 front and back rail both have rail tabs. These
rail tabs MUST be on top of the rail when assembled.
1. Remove the straight door arm and hanging bracket packaged inside the front rail 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 sections on a flat surface as shown and slide the tapered endsinto the larger ones.
Tabsalong the side will lockinto place.
3. Place the motor unit on packing material to protect the cover,and rest the back end of the rail on
top. For convenience,put a support under the front end ofthe rail.
4. As a temporary stop,inserta screwdriver into the hole 10" (25 cm) from the front end ofthe rail,
as shown.
5. Check to be sure there are 4 plasticwear pads inside the inner trolley.Ifthey became loose
during shipping, check all packing material. Snap them back into position as shown.
6. Slide the trolley assembly along the rail from the back end to the screwdriver.
7. Slide the rail onto the “U” bracket, until itreaches all the stops on the top and sides of the “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
Rail
Tab
Trolley
Window
Cut-Out
Idler
Pulley
Hole

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 of the opener.
1. Insert a 1/4"-20x1-3/4" boltinto the cover protection bolt hole on the backend of the rail as
shown.Tighten securely with a 1/4"-20 locknut. DO NOT overtighten.
2. Remove the boltand nut from the top ofthe motor unit.
3. Use the carton to supportthe frontend of the rail.
4. Place the “U” bracket,flat side down onto the motor unit and align the bracketholes with the bolt
holes.
5. Fasten the “U” bracket with the previously removed bolt and locknut; DO NOT use any power
tools.The use ofpower toolsmaypermanentlydamage the garage door opener.
HARDWARE
Bolt 1/4"-20x1-3/4"
Lock Nut 1/4"-20
(Mounted in the
Bolt and Nut
garage door opener)
“U” Bracket
Bolt
Cover Protection
Bolt Hole
Bolt 1/4"-20x1-3/4"
Lock Nut 1/4"-20
Lock Nut

7
Assembly
STEP 3 Install the idler pulley
1. Lay the belt beside the rail, as shown.Grasp the end with the hooked trolley connector and pass
approximately12" (30 cm) ofbelt through the window.Keep the ribbed side toward the rail, and
allowitto hang until AssemblyStep 4.
2. Remove the tape from the idler pulley. The inside center should be pre-greased. If dry,regrease
to ensure proper operation.
3. Place the idler pulley into the window asshown.
4. Insert the idler bolt from the top through the rail and pulley.Tighten with a 3/8" lockwasher and
nut underneath the rail until the lock washer is compressed.
5. Rotate the pulleyto be sure itspins freely.
6. Locate the rail tab.The rail tab is between the idler bolt and the trolley in the front rail section. Use
a flathead screwdriver and lift the rail tab until the tab is vertical (90º).
HARDWARE
Bolt Nut 3/8"
Lock Washer 3/8"
Screwdriver
Rail
Trolley Connector
Bolt
Lock Washer 3/8"
Nut 3/8"
Rail
Tab
CORRECT
INCORRECT
Rail Tab
Idler Pulley
Grease Inside Pulley

8
Assembly
STEP 4 Install the belt
1. Pull the belt around the idler pulley and toward the trolley. The ribbed side mustcontactthe
pulley.
2. Hook the trolley connector into the retaining slot on the trolley as shown (Figure 1).
3. With the trolley againstthe screwdriver, dispense the remainder of the belt along the rail
lengthtoward the motor unit and around the sprocket (Figure 2).The sprocket teeth mustengage
the belt.
4. Check to make sure the belt is nottwisted.Connect the trolley threaded shaft with the master link
(Figure 3).
lPush pins of master link bar through holes in end of belt and trolley threaded shaft.
lPush master link cap over pinsand pastpin notches.
lSlide clip-on spring over cap and onto pin notches until both pinsare securely locked in
place.
5. Remove the spring trolley nutfrom the threaded shaft.
6. Insert the trolley threaded shaftthrough the hole in the trolley.
HARDWARE
Master
Link
Threaded Shaft with Spring Trolley Nut
Sprocket
Figure 3
Front Rail
Section
(TO DOOR)
Idler
Pulley
Threaded Shaft
Master
Link
Figure 2
Trolley Connector
Figure 1
Retaining
Slot

9
Assembly
STEP 5 Tighten the belt
1. By hand, thread the spring trolley nut on the threaded shaft until it is finger tight against the
trolley. Do not use any tools. Remove the screwdriver.
2. Insert a flathead screwdriver tip into one ofthe nut ring slotsand brace itfirmly againstthe trolley.
3. Tighten the spring trolley nutwith an adjustable wrench or a 7/16" open end wrench about a
quarter turn until the spring releases and snaps the nut ring againstthe trolley.This setsthe
spring to optimum belt tension.
Nut Ring
BEFORE
1"
(2.5 cm)
Nut Ring
AFTER
1-1/4"
(3.18 cm)
Nut Ring Slot
Spring Trolley
STEP 6 Install the sprocket cover
To avoid possible SERIOUS INJURY to finger from moving garage door opener:
lALWAYS keep hand clear of sprocket while operating opener.
lSecurely attach sprocket cover BEFORE operating.
1. Position the sprocket cover over the sprocketasshown and fasten to the mounting plate with
8x3/8" hex screws provided.
You have now finished assembling your garage door opener. Please read the following warnings
before proceeding to the installation section.
Hex Screw #8x3/8"
(Packed with the
sprocket cover)
HARDWARE
Hex Screw #8x3/8"
Sprocket Cover