Liftmaster 8155 User Manual
Installation Manual
Model 8155
FOR RESIDENTIAL USE ONLY
Please read this manual and the safety
materials carefully!
• The door WILL NOT CLOSE unless the
Protector System
properly aligned.
• Periodic checks of the garage door
opener are required to ensure safe
operation.
• The model number label is located on
the front panel of your garage door
opener.
• This garage door opener is
ONLY compatible with MyQ
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.
®
is connected and
®
and
LiftMaster
845 Larch Avenue
Elmhurst, Illinois 60126-1196
LiftMaster.com
Contents
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Install the Door Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Install the Protector System
Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
®
. . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Repair Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2
Preparation
Torsion
Spring
Extension
Spring
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.
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 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®Smartphone Control, and any other MyQ®devices are to be used
ONLY with sectional doors.
Check the Door
To prevent possible SERIOUSINJURYor DEATH:
l 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.
l NEVER try to loosen, move or adjust garage door, door springs, cables,
pulleys, brackets or their hardware, ALLof which are under EXTREME tension.
l Disable ALLlocks and remove ALLropes connected to garage door BEFORE
installation and operating garage door opener to avoid entanglement.
l 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:
l ALWAYS disable locks BEFORE installing and operating the opener.
l ONLY operate garage door opener at 120V, 60Hz 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 inch (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 4feet (1.2 m) to the left or right of the door center. See page 9.
3
Preparation
3/16
5/32
5/16
7/16
1/2
5/8
9/16
1/4
7/16
Tools Needed
4
Preparation
A
B
C
J
N
I
O
P
D
E
F
H
G
K
L
M
Not Provided
Not
Provided
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.
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. Sprocket cover with hex screws
K. Belt
L. Door control
M. White and red/white wire
N. The Protector System
Safety reversing sensors with white and white/black wire attached: Sending
Sensor (1) Receiving Sensor (1) and Safety Sensor Brackets (2)
O. Safety labels and literature
P. Rail grease
®
Installation Hardware
Hex bolt 5/16"-18 x 7/8" (4) Lock washer 5/16" (4)
Lag screw 5/16"-9 x 1-5/8" (2) Self-threading screw 1/4"-14 x 5/8" (2)
Clevis Pin 5/16" x 2-3/4" (1) Ring fastener (3)
Clevis Pin 5/16" x 1-1/4" (1) Carriage bolt 1/4"-20 x 1/2" (2)
Clevis Pin 5/16" x 1" (1) Wing nut 1/4"-20 (2)
Nut 5/16"-18 (4)
Door Control Hardware
Screw 6AB x 1" (2)
Screw 6-32 x 1" (2)
Drywall anchors (2)
Insulated staples
Security+ 2.0®Accessories
882LMW
Multi-Function Door Control
891LM
Remote Control
5
Assembly
Washered Bolts
5/16"-18 x 1/2"
(Mounted in
the garage
door opener)
Hex Screws 8 x 3/8"
Sprocket
Cover
1 Attach the Rail to the Garage Door Opener
To avoid possible SERIOUS INJURY to finger from moving garage door opener:
l ALWAYS keep hand clear of sprocket while operating opener.
l Securely attach sprocket cover BEFORE operating.
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 the two bolts from the top of the garage door opener.
2. Align the rail and the styrofoam over the sprocket. Cut the tape from the rail, belt,
and styrofoam.
3. Fasten the rail with the previously removed bolts.
4. Position the belt around the garage door opener sprocket.
5. Attach the sprocket cover over the garage door opener sprocket and attach with
hex screws.
6
Assembly
Spring Trolley Nut
(To motor unit)
Nut ring
slot
Nut Ring
Nut Ring
AFTER RELEASE
1-1/4"
(3.18 cm)
BEFORE
1"
(2.5 cm)
1
2
3
2 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.
2. Insert a flathead screwdriver tip into one of the nut ring slots and brace it firmly
against the trolley.
3. Tighten the spring trolley nut with an adjustable wrench or a 7/16" open end
wrench about a quarter turn until the spring releases and snaps the nut ring
against the trolley. This sets the spring to optimum belt tension.
7
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. Install garage door opener 7 feet (2.13 m) or more above 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.
NOTE: If you are installing the garage door opener on a one-piece door, visit LiftMaster.com for installation instructions.
9. Install wall-mounted garage door control:
l within sight of the garage door.
l out of reach of children at minimum height of 5 feet (1.5 m).
l away from ALL moving parts of the door.
10. Place entrapment warning label on wall next to garage door control.
11. Place manual 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.
8
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
1 Determine the Header Bracket Location
NOTE: If you are installing the garage door opener on a one-piece door, visit
LiftMaster.com for installation instructions.
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 10 for ceiling installation.
To prevent possible SERIOUS INJURY or DEATH:
l 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.
l Concrete anchors MUST be used if mounting header bracket or 2x4 into
masonry.
l NEVER try to loosen, move or adjust garage door, springs, cables, pulleys,
brackets, or their hardware, ALL of which are under EXTREME tension.
l 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.
l 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.
9
Installation
HARDWARE
Lag Screw 5/16"-9x1-5/8"
Wall Mount
Optional
Mounting
Holes
Vertical
Centerline of
Garage Door
(Header Wall)
Header
Bracket
2x4 Structural
Support
Door Spring
(Garage Door)
Highest Point of
Garage Door
Travel
Horizontal
Line
Lag Screw
5/16" - 9 x 1-5/8"
(Header Wall)
Ceiling Mounting Holes
(Finished Ceiling)
Vertical
Centerline of
Garage Door
Header
Bracket
6" (15 cm)
Maximum
Door Spring
(Garage Door)
Lag Screw
5/16" - 9 x 1-5/8"
2 Install the Header Bracket
You can attach the header bracket either to the wall above the garage door, or to the
ceiling. Follow the instructions which will work best for your particular requirements. Do
not install the header bracket over drywall. If installing into masonry, use concrete
anchors (not provided).
OPTION A WALL INSTALLATION
1. Center the bracket on the vertical centerline with the bottom edge of the bracket
on the horizontal line as shown (with the arrow pointing toward the ceiling).
2. Mark the vertical set of bracket holes (do not use the holes designated for ceiling
mount). Drill 3/16" pilot holes and fasten the bracket securely to a structural
support with lag screws.
OPTION B CEILING INSTALLATION
1. Extend the vertical centerline onto the ceiling as shown.
2. Center the bracket on the vertical mark, no more than 6" (15 cm) from the wall.
Make sure the arrow is pointing toward the wall. The bracket can be mounted
flush against the ceiling when clearance is minimal.
3. Mark the side holes. Drill 3/16" pilot holes and fasten bracket securely to a
structural support with lag screws.
10
Installation
HARDWARE
Clevis Pin 5/16" x 2-3/4" Ring Fastener
Ring
Fastener
Clevis Pin
5/16
" X 2-3/4"
Connected Disconnected
3 Attach the Rail to the Header Bracket
1. Align the rail with the header bracket. Insert the clevis pin through the holes in
the header bracket and rail. Secure with the ring fastener.
NOTE: Use the packing material as a protective base for the garage door opener.
4 Position the Garage Door Opener
To prevent damage to garage door, rest garage door opener rail on 2x4 placed on top
section of door.
1. Remove the packing material and lift the garage door opener onto a ladder.
2. Fully open the door and place a 2x4 (laid flat) under the rail.
A 2x4 is ideal for setting the distance between the rail and the door. If the ladder is not
tall enough you will need help at this point. If the door hits the trolley when it is raised,
pull the trolley release arm down to disconnect the inner and outer trolley. Slide the outer
trolley toward the garage door opener. The trolley can remain disconnected until
instructed.
11
Installation
FIGURE 1
FIGURE 2
(Not Provided)
Lag Screws
5/16"- 18x1-7/8"
Measure
Distance
Hex Bolt 5/16"- 18x7/8", Lock Washer 5/16", Nut 5/16"-18
FIGURE 3
Not Provided
Finished Ceiling
Unfinished Ceiling
Hex Bolt 5/16"- 18x7/8" Nut 5/16"-18 Lock Washer 5/16"
HARDWARE
5 Hang the Garage Door Opener
To avoid possible SERIOUS INJURY from a falling garage door opener, fasten it
SECURELY to structural supports of the garage. Concrete anchors MUST be used if
installing ANY brackets into masonry.
Hanging your garage door opener will vary depending on your garage. Two
representative installations are shown. Yours may be different. Hanging brackets should
be angled (Figure 1) to provide rigid support. On finished ceilings (Figure 2), attach a
sturdy metal bracket to structural supports before installing the opener. This bracket and
fastening hardware are not provided.
1. Measure the distance from each side of the motor unit to the structural support.
2. Cut both pieces of the hanging bracket to required lengths.
3. Drill 3/16" pilot holes in the structural supports.
4. Attach one end of each bracket to a support with 5/16"-18x1-7/8" lag screws (not
provided).
5. Fasten the opener to the hanging brackets with 5/16"-18x7/8" hex bolts, lock
washers and nuts.
6. Check to make sure the rail is centered over the door (or in line with the header
bracket if the bracket is not centered above the door).
7. Remove the 2x4. Operate the door manually. If the door hits the rail, raise the
header bracket.
NOTE: DO NOT connect power to opener at this time.
12
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