Chamberlain 85870 User manual

Wi-Fi®Garage Door Openers
Chain Drive Model - 85870
FOR RESIDENTIAL USE ONLY •Please read this manual and the safety materials carefully!
•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.
•This garage door opener is ONLY 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.
•Attach warning labels to the location indicated on label.
Register your garage door opener to receive updates and offers from LiftMaster.
SM
1. Take a photo of the camera icon
including the points ( ).
2. Send it in by texting the photo to
71403 (US) or visit
www.liftmaster.photo (Global).
LiftMaster
300 Windsor Drive
Oak Brook, IL 60523

2
Table of Contents
Preparation 3
Assembly 7
Installation 9
Install the Door Control 17
Install the Protector System 19
Adjustments 25
Operation 28
Maintenance 35
Troubleshooting 36
Accessories 38
Warranty 39
Automatic Garage Door Opener Safety & Maintenance Guide 40
Repair Parts 42

3
Preparation
myQ®Serial Number
Write down the following information for future reference:
myQ®Serial Number:
myQ®Serial Number Product S/N
Product S/N:
Date of Purchase:
/ /
Safety Symbol and Signal Word Review
This garage door opener has been designed and tested to offer safe service provided it is installed,
operated, maintained and tested in strict accordance 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 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.
Mechanical
Electrical
When you see this Signal Word on the following pages, it will alert you to the possibility of damage
to your garage door and/or the garage door opener if you do not comply with the cautionary
statements that accompany it. Read them carefully.
WARNING: This product can expose you to chemicals including lead, which are known to
the State of California to cause cancer or birth defects or other reproductive harm. For
more information go to www.P65Warnings.ca.gov
Unattended Operation
The Timer-to-Close (TTC) feature, the myQ® 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 allows the door to close without being in the line of sight of the door is considered unattended
close. The Timer-to-Close (TTC) feature, the myQ® App, and any other myQ® devices are to be used
ONLY with sectional doors.

4
Preparation
Before You Connect with Your Smartphone
Monitor and control your garage door from anywhere using the myQ® App.
You will need:
•Wi-Fi® enabled smartphone, tablet or laptop
•Broadband Internet Connection
•Wi-Fi® signal in the garage (2.4 GHz, 802.11b/g/n required)
•Password for your home network (router's main account, not guest network)
TEST THE WI-FI® SIGNAL STRENGTH
Make sure your mobile device is connected to your Wi-Fi® network. Hold your mobile device in the
place where your garage door opener will be installed and check the Wi-Fi® signal strength.
Check Signal Strength. If you see:
Wi-Fi signal is strong.
The garage door opener will
connect to your Wi-Fi network.
Wi-Fi signal is weak.
The garage door opener may connect to your
Wi-Fi network. If not, try one of the options
below to improve the Wi-Fi signal:
No Wi-Fi signal.
The garage door opener will not be able to
connect to your Wi-Fi network. Try one of the
options below to improve the Wi-Fi signal:
• Move your router closer to the garage door opener to minimize
interference from walls and other objects
• Buy a Wi-Fi range extender
For compatible router specifications and help, visit support.chamberlaingroup.com.
See page 30 to connect the garage door opener to a mobile device.
Check the Door
To prevent possible SERIOUSINJURYor DEATH:
•ALWAYS 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.
•NEVER try to loosen, move or adjust garage door, door springs, cables, pulleys, brackets
or their hardware, ALLof which are under EXTREME tension.
•Disable ALLlocks and remove ALLropes connected to garage door BEFORE installation
and operating garage door opener to avoid entanglement.
•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.
To prevent damage to garage door and opener:
•ALWAYS disable locks BEFORE installing and operating the opener.
•ONLY operate garage door opener at 120V, 60Hz to avoid malfunction and damage.
Before you begin:
1. Disable locks and 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 check for 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 must not exceed 1/4" (6 mm). Otherwise, the
safety reversal system may not work properly.
5. The opener should be installed above the center of the door. If there is a
torsion spring or center bearing plate in the way of 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

5
Preparation
Tools Needed
3/16
5/32
5/16
7/16
1/2
5/8
9/16
1/4
7/16

6
Preparation
Carton Inventory
Accessories will vary depending on the garage door opener model purchased. Depending on your
specific model, other accessories may be included with your garage door opener. The instructions
for these accessories will be attached to the accessory and are not included in this manual. The
images throughout this manual are for reference and your product may look different.
Garage Door Opener Assembly
A. Header bracket
B. Pulley and bracket
C. Door bracket
D. Curved door arm
E. Straight door arm
F. Trolley
G. Emergency release rope and handle
H. Rail
I. Garage door opener
J. Chain spreader
K. Chassis support bracket
L. Chain
M. Door control
N. White and red/white wire
O. The Protector System
Safety reversing sensors with white and white/black wire attached: Sending sensor (1),
receiving sensor (1), and safety sensor brackets (2)
P. Safety labels and literature
Q. Rail grease
R. Remote Control (893MAX)
Hardware
Assembly
Chassis Support Bracket Hardware Chain Spreader Hardware
Screw #8-32 x 3/8" (2) Screw #8-32 x 3/8" (2)
Hex Bolts 1/4"-20 x 5/8" (2) Rail Hardware
Lock Washers (2) Washered Bolts and Lock Washer (mounted in
the top of the garage door opener)
Washered Bolt 5/16"-18 x 1/2" (2)
Installation
Hex Bolt 5/16"-18 x 7/8" (4) Self-Threading Screw 1/4"-14 x 5/8" (2)
Lag Screw 5/16"-9 x 1-5/8" (2) Ring Fastener (3)
Lag Screw 5/16"-18 x 1-5/8" (2) Carriage Bolt 1/4"-20 x 1/2" (2)
Clevis Pin 5/16" x 2-3/4" (1) Wing Nut 1/4"-20 (2)
Clevis Pin 5/16" x 1-1/4" (1) Hex Bolt 1/4"-20 x 5/8" (2)
Clevis Pin 5/16" x 1" (1) Lock Nut 1/4"-20 (2)
Nut 5/16"-18 (4) Lag Screw 1/4" x 1-1/2" (4)
Lock Washer 5/16"-16 (4)
Door Control Hardware
Screw 6AB x 1" (2) Drywall Anchors (2)
Screw 6-32 x 1" (2) Insulated Staples
AB
C
K
J
I
P
DE
F
H
G
L
M
N
Q
O
R
Not
Provided Not
Provided

7
Assembly
1 Attach the Rail to the Garage Door Opener
To avoid SERIOUS damage to garage door opener, use ONLY those bolts/fasteners mounted in
the top of the opener.
NOTE: ONLY use the bolts removed from the garage door opener. Place the garage door opener on
the packing material to prevent scratching.
1. Remove bolt and lock nut from the top of the garage door opener.
2. Align the rail and the styrofoam over the sprocket. Cut the tape from the rail, chain, and
styrofoam.
3. Fasten the rail with the previously removed washered bolt and lock nut.
4. Position the chain around the garage door opener sprocket.
5. Attach the chain spreader to the garage door opener with screws.
6. Guide the chain around the selected groove in the chain spreader, to engage either the 8-
tooth or 6-tooth sprocket.
NOTE: The 6-tooth sprocket is for use with Carriage House Doors and the 8-tooth sprocket
is for use with regular doors.
Washered Bolt
5/16"-18x1/2"
(Mounted in the garage
door opener)
HARDWARE
Lock Nut
(Mounted in the
garage door opener)
Lock
Nut
Washered Bolt
5/16"-18x1/2"
Hex Screws 8-32x1"
Washers
Chain Spreader6-Tooth
Sprocket
8-Tooth
Sprocket
Chain Spreader
Model 85870 only
Motor Unit Mounting Plate Motor Unit Mounting Plate

8
Assembly
2 Attach the Chassis Support Bracket
To avoid possible SERIOUS INJURY to finger from moving garage door opener:
•ALWAYS keep hand clear of sprocket while operating opener.
•Securely attach sprocket cover BEFORE operating.
1. Position the chassis support bracket on the unit.
2. Attach the bracket to the rail with 1/4"-20 x 5/8" hex bolts and lock washers. Do not
overtighten.
3. Attach the bracket to the opener by inserting a 5/16"-18 x 1/2" washered screw through a
hole in each side flange and a matching hole in the bracket. Complete the connection by
inserting the #8-32 x 3/8" screw through the back flange and the hole in rail support.
Washerd Bolt
5/16"-18x1/2"
Screw
#8-32x3/8"
Hex Bolt
1/4"-20x5/8"
Lock
Washer
3 Tighten the Chain
1. Loosen the inner nut and lock washer on the trolley threaded shaft.
2. Tighten the outer nut until the chain is a 1/2" above the base of the rail at the midpoint
oftherail.
3. Re-tighten the inner nut.
Slack in the chain is normal when the door is closed. No readjustment is necessary.
Sprocket noise can result if the chain is too loose. During future maintenance, ALWAYS pull the
emergency release handle to disconnect the trolley before adjusting the chain.
Sprocket noise can result if the chain is too loose. During future maintenance, ALWAYS pull the
emergency release handle to disconnect the trolley before adjusting the chain.
1/2" (13 mm)

9
Installation
IMPORTANT INSTALLATION INSTRUCTIONS
To reduce the risk of SEVERE INJURY or DEATH:
1. READ AND FOLLOW ALL INSTALLATION WARNINGS AND INSTRUCTIONS.
2. Install garage door opener ONLY on properly balanced and lubricated garage door. An
improperly balanced door may NOT reverse when required and could result in SEVERE
INJURY or DEATH.
3. ALL repairs to cables, spring assemblies and other hardware MUST be made by a trained
door systems technician BEFORE installing opener.
4. Disable ALL locks and remove ALL ropes connected to garage door BEFORE installing
opener to avoid entanglement.
5. Where possible, install the door opener 7 feet (2.13 m) or more above the floor.
6. Mount the emergency release within reach, but at least 6 feet (1.83 m) above the floor
and avoiding contact with vehicles to avoid accidental release.
7. NEVER connect garage door opener to power source until instructed to do so.
8. NEVER wear watches, rings or loose clothing while installing or servicing opener. They
could be caught in garage door or opener mechanisms.
9. Install wall-mounted garage door control:
•within sight of the garage door.
•out of reach of small children at a minimum height of 5feet (1.5m)
above floors, landings, steps or any other adjacent walking surface.
•away from ALL moving parts of the door.
10. Place entrapment warning label on wall next to garage door control in a
prominent location.
11. Place emergency release/safety reverse test label in plain view on inside of
garage door.
12. Upon completion of installation, test safety reversal system. Door MUST
reverse on contact with a 1-1/2" (3.8cm) high object (or a 2x4 laid flat) on the
floor.
13. To avoid SERIOUS PERSONAL INJURY or DEATH from electrocution,
disconnect ALL electric power BEFORE performing ANY service or
maintenance.
14. 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.
15. SAVE THESE INSTRUCTIONS.

10
Installation
1 Determine the Header Bracket Location
To prevent possible SERIOUS INJURY or DEATH:
•Header bracket MUST be RIGIDLY fastened to structural support on header wall or
ceiling, otherwise garage door might NOT reverse when required. DO NOT install header
bracket over drywall.
•Concrete anchors MUST be used if mounting header bracket or 2x4 into masonry.
•NEVER try to loosen, move or adjust garage door, springs, cables, pulleys, brackets, or
their hardware, ALL of which are under EXTREME tension.
•ALWAYS call a trained door systems technician if garage door binds, sticks, or is out of
balance. An unbalanced garage door might NOT reverse when required.
•DO NOT enable the Timer-to-Close functionality if operating either one-piece or swinging
garage doors. To be enabled ONLY when operating a sectional door.
Close the door and mark the inside vertical centerline of the garage door.
Extend the line onto the header wall above the door. You can fasten the header bracket within 4 feet
(1.22 m) of the left or right of the door center only if a torsion spring or center bearing plate is in the
way; or you can attach it to the ceiling when clearance is minimal. (It may be mounted on the wall
upside down if necessary, to gain approximately 1/2" (1 cm). If you need to install the header bracket
on a 2x4 (on wall or ceiling), use lag screws (not provided) to securely fasten the 2x4 to structural
supports.
Open your door to the highest point of travel as shown. Draw an intersecting horizontal line on the
header wall 2" (5 cm) above the high point. This height will provide travel clearance for the top edge
of the door.
NOTE: If the total number of inches exceeds the height available in your garage, use the maximum
height possible, or refer to page 11 for ceiling installation.
Header Wall
Unfinished
Ceiling
Vertical Centerline
of Garage Door
2x4
2x4
Structural
Supports
Level
(Optional)
OPTIONAL
CEILING
MOUNT FOR
HEADER
BRACKET
Sectional door with curved track
Header Wall
Track
2" (5 cm)
Highest Point
of Travel
Door