Chamberlain T User manual

Serial #
(located on electrical box cover)
Installation Date
Wiring Type
OWNER'S MANUAL
MODEL T
INDUSTRIAL DUTY DOOR OPERATOR
C2 Wiring
F A C T O R Y S E T
See page 8 for
other wiring
configurations
2 YEAR WARRANTY NOT FOR RESIDENTIAL USE
LISTED DOOR OPERATOR
41B6

MOTOR
TYPE: .................................Continuous duty
HORSEPOWER:.................1/3, 1/2, 3/4 & 1 Hp
Single or Three phase
SPEED:...............................1725 RPM
VOLTAGE: ..........................115, 220, 230 Single phase
230, 460, 575 Three phase
CURRENT: .........................See motor nameplate
2
MECHANICAL
DRIVE REDUCTION:.............Primary: Heavy duty
(5L) V-Belt. Secondary: #41 chain/sprocket.
Output: #48 chain (1/3 &1/2Hp) or #41 chain (3/4 &1Hp)
OUTPUT SHAFT SPEED:.....140 R.P.M.
DOOR SPEED:......................11" - 12” per sec.
depending on door
BRAKE: .................................Solenoid actuated disc
brake on 3/4 & 1Hp
BEARINGS:...........................Output Shaft: Shielded
Ball Bearing. Clutch Shaft: IronCopper sintered and
oil impregnated.
SAFETY
DISCONNECT: .............Quick disconnect door arm for
emergency manual door operation.
REVERSING EDGE:.....(Optional) Electric or pneumatic
sensing device attached to the bottom edge of door.
A REVERSING EDGE IS STRONGLY
RECOMMENDED FOR
ALL COMMERCIAL
OPERATOR INSTALLATIONS.
REQUIRED WHEN
THE 3 BUTTON CONTROL STATION IS OUT OF
SIGHT OF DOOR OR ANY OTHER CONTROL
(AUTOMATIC OR MANUAL) IS USED.
SPECIFICATIONS
ELECTRICAL
TRANSFORMER:.............24VAC
CONTROL STATION: ......NEMA 1 three button station.
OPEN/CLOSE/STOP
WIRING TYPE:.................C2 (Factory Shipped)
Momentary contact to OPEN & STOP, constant
pressure to CLOSE, open override plus wiring for
sensing device to reverse. See page 8 for optional
control settings.
LIMIT ADJUST:................Linear driven, fully
adjustable screw type cams. Adjustable to 24 feet.
WEIGHTS AND DIMENSIONS
HANGING WEIGHT: .........80-110 LBS.
10-1/2”
Door Height Plus 4 feet (minimum)
20-1/2”
13-1/8”
HIGHEST POINT OF DOOR TRAVEL
4”
*
*
*- For Units with Brake add 3-1/2”
(Standard on 3/4 & 1Hp models Optional on 1/3 & 1/2Hp)

3
PREPARATION
KEEP DOOR BALANCED. STICKING OR BINDING
DOORS MUST BE REPAIRED. DOORS, DOOR
SPRINGS, CABLES, PULLEYS, BRACKETS AND
THEIR HARDWARE MAY BE UNDER EXTREME
TENSION AND CAN CAUSE SERIOUS PERSONAL
INJURY OR DEATH. CALL A PROFESSIONAL DOOR
SERVICEMAN TO MOVE OR ADJUST DOOR
SPRINGS OR HARDWARE.
WARNING
CAUTION
WARNING
WARNING
SPACER BRACKET
(Mounted Nylon Pad Side Up)
FRONT IDLER ASSEMBLY
TROLLEY CARRIAGE
L - SLOT
Master Link
Takeup Bolt
Roller Chain
Master Link
Hex
Nut
Straight Arm
Lockwasher
Hex Nut
TROLLEY ASSEMBLY
Take-Up Bolt
Trolley Carriage
Reel Chain
around Idler and
over Spacer Brackets
POWERHEAD ATTACHMENT
1. Position the track assembly on the frame of the
powerhead so that the motor side of operator is in
back (away from door ).
2. Loosely install two 3/8"-16 x 3/4" bolts and nuts in
third hole from the end of the track .
3. Align the track so that the bolts inserted in step 2
line up with the L-Slots in the frame.
4. Connect the track to the powerhead by fastening
two 3/8"-16 x 3/4" bolts and nuts through the frame
and the end holes in track. Tighten all four bolts to
secure the track to the powerhead.
TROLLEY CARRIAGE / CHAIN ATTACHMENT
1. Attach the take-up bolt to the trolley carriage
using 3/8-16 hex nuts and lock washer, as shown
below.
2. Using one of the master links, attach the chain to
the other end of the trolley carriage. Reel the chain
around the front idler shaft, over the spacer brackets,
back to the drive shaft sprocket, and then to the take-
up bolt on the carriage.
3. Using the other master link, attach the chain to
the take-up bolt and tighten to the desired chain
tension.
Chain Tension: With trolley positioned at either end
of the track, a properly adjusted chain will sag about
3" at the mid-point. If necessary, remove links from
the chain to achieve proper adjustment.
TRACK ASSEMBLY
1. Using the 3/8"-16 x 3/4 " bolts and flange hex
nuts supplied, assemble the operator track by
installing and tightening the track spacer brackets.
Position the spacers evenly over the length of the
track. NOTE: The nylon pad on the spacer bracket
should face up.
2. Using (2) 3/8"-16 x 1" bolts and lock washers,
install the front idler assembly to the second set of
holes of one end of the track. Refer to the illustration
below.
3. Slide the trolley carriage onto the track so that
the take-up bolt will be toward the operator.

4
Carpenter's
Level Header
Wall
High Arc
Point
IMPORTANT NOTE: Before the operator is installed, be sure the door has been properly aligned and is working
smoothly. Although each installation will vary due to particular building characteristics, refer to the following
general procedures to install the operator.
MOUNT HEADER BRACKET
The trolley operator is generally mounted over the
center of the door. However, off center mounting
may be required due to interfering structures or
location of door stile / top section support. In such
cases, the operator may be mounted up to 24” off
center on torsion spring doors. Extension springs
require center mounting.
1. Locate the center of the door and mark a line on
the wall directly above the door. Extend this line up
the wall.
2. Determine the highest point of door travel.
Slowly raise the door and observe the action of the
top section. When the top section reaches its highest
point, use a level and project a line from this point to
the center line the of the door.
MOUNT OPERATOR
1. Allowing the motor to rest on the floor, raise the
front end of the track assembly to the front header
bracket and fasten using the 3/8”dia. x 6.40” long
pivot shaft and cotterpins supplied.
3. Using the projected lines for location, mount a
suitable wood block or length of angle iron to the wall
above the door opening. Refer to the illustration
below. This will provide a mounting pad for the front
header bracket of the operator. If necessary
reinforce the wall with suitable mounting brackets to
ensure adequate support of mounting pad. Using
suitable hardware, mount the (U shaped) front header
bracket to the pad.
Header Bracket Drill Pattern
2. Swing the operator to a horizontal position above
the guide rails and temporarily secure with a suitable
rope, chain, or support from the floor. Now open
garage door slowly, being careful not to dislodge the
temporary support. Using the door as a support,
place a level against the rail and shim the operator
until it is horizontal. Make sure that the operator is
aligned with the center line of the door.
Door Travel
Projection
INSTALLATION INSTRUCTIONS
Header Attachment
Pivot shaft
Cotterpins
Using the Door as support, shim
operator to a horizontal position.
Guide
Rails
Operator Alignment
OF DOOR
3.50” 1.75”
4” MIN.
High Rise Point
Projection Line

5
INSTALLATION INSTRUCTIONS
OPERATOR SUPPORT
1. The illustration below shows a typical method of
hanging the operator from the ceiling. Each
installation may vary, but in all cases side braces
should be used for additional strength.
2. For mounting of the support brace(s) to the
powerhead, Four holes (clearance up to 3/8” bolts)
are located on each side of frame.
NOTE: If the operator is longer than 15 feet, use of a
mid-span support is recommended.
STRAIGHT ARM ATTACHMENT
1. Fully close the door and move the trolley slider to
within (2”) two inches of the front idler.
2. Latch the straight door arm to the fixed roll pin in
the trolley carriage. Make sure the open side of
notch on the arm faces the doorway.
3. Attach the door bracket to the door arm using the
3/8”-16 x 1” bolt and nylon locking nut provided.
Leave the nut and bolt loose enough to allow the two
pieces to pivot freely.
4. Using 3/8” hardware provided, bolt the curved
door arm to the straight arm, aligning the mounting
holes in such a way that the door bracket pivot bolt
will be in line with the top rollers on the door.
5. Position the door bracket to the center line on the
door. Using suitable hardware, attach the door
bracket to the door. Many installations, except solid
wood doors, will require additional support for the
door. Refer to the illustration below.
IMPORTANT NOTE: At this time, ensure all bolts
and lag screws are properly secured.
Powerhead Support Brace
Mid-Span
Support Brace
Center Line of Door
Straight Arm
Door Bracket
Curved
Door Arm
Top
Roller
Pivot Bolt
FAILURE TO SUSPEND THE OPERATOR
SECURELY MAY RESULT IN SERIOUS PERSONAL
INJURY OR DEATH, AND/OR PROPERTY DAMAGE.
WARNING
CAUTION
WARNING
WARNING

6
TO AVOID SERIOUS PERSONAL INJURY OR DEATH
FROM ELECTROCUTION, DISCONNECT ELECTRIC
WARNING
LIMIT SWITCH ADJUSTMENT
MAKE SURE THE LIMIT NUTS ARE POSITIONED BETWEEN THE LIMIT SWITCH ACTUATORS BEFORE
PROCEEDING WITH ADJUSTMENTS.
If other problems persist, call our toll-free number for
assistance - 1-800-528-2806.
1. To adjust limit nuts depress retaining plate to allow
nut to spin freely. After adjustment, release plate
and ensure it seats fully in slots of both nuts.
2. To increase door travel, spin nut away from actu-
ator. To decrease door travel, spin limit nut
toward actuator.
3. Adjust open limit nut so that door will stop in open
position with the bottom of the door even with top
of door opening.
4. Repeat Steps 1 and 2 for close cycle. Adjust close
limit nut so that actuator is engaged as door fully
seats at the floor.
Retaining Plate
CLOSE Limit Switch
SAFETY
(Aux. Close) Limit Switch
OPEN Limit Switch
Actuator
Aux. OPEN Limit Switch
SENSING EDGES & PHOTO EYES
Sensing devices supplied for door industry type operators
with an isolated normally open (N.O.) output are compati-
ble with your operator. This includes pneumatic and elec-
tric edges, and through beam and retro reflective photo
eyes. If your door does not have a bottom sensing edge or
safety photo eyes and you wish to add a safety device to
your application, please contact your local LiftMaster
Authorized Dealer.
If not pre-installed by the door manufacturer, mount the
sensing edge on the door according to the instructions pro-
vided with the edge. The sensing edge may be electrical-
ly connected by either coiled cord or take-up reel. Refer to
the steps below.
Important Notes:
a) Proceed with Limit Switch Adjustments before making
any sensing edge wiring connections to operator as
described below.
b) Electrician must hardwire the junction box to the oper-
ator electrical box in accordance with local codes.
ENTRAPMENT PROTECTION ACCESSORIES (OPTIONAL)
WIRING:
For wiring of your sensing device to the operator,
refer to the wiring diagram supplied with your opera-
tor. See field connection terminals identified as
Sensing Device or Safety Edge.
TAKE-UP REEL: Take-up reel should be installed
12" above the top of the door.
COIL CORD: Connect operator end of coil cord to
junction box (not supplied) fastened to the wall
approximately halfway up the door opening.
IT IS STRONGLYRECOMMENDED THAT A
SAFETY PHOTO EYE OR SENSING EDGE BE
USED IN CONJUNCTION WITH THE OPERATOR.
NOTICE

7
Remove the cover from the electrical enclosure. Inside this enclosure you will find the wiring diagram(s)
for your unit. Refer to the diagram (glued on the inside of the cover) for all connections described below.
If this diagram is missing, call the number on the back of this manual. DO NOT INSTALL ANY WIRING OR
ATTEMPT TO RUN THIS OPERATOR WITHOUT CONSULTING THE WIRING DIAGRAM.
POWER WIRING CONNECTIONS
ON THREE PHASE MACHINES ONLY!
Incorrect phasing of the power supply will cause the
motor to rotate in the wrong direction (open when
CLOSE button is pressed and vice-versa). To correct
this, interchange any two of the incoming three phase
power lines.
CONDUIT ACCESS
WARNING
Do Not Run Power &
Control Wiring in the
Same Conduit
7/8” Dia Knockouts for
control wiring conduit access
(1 on end panel)
1-1/16’ Dia Knockouts for
power wiring conduit access
(1 on end panel)
WARNING
CAUTION
WARNING
WARNING
DISCONNECT POWER AT THE FUSE BOX BEFORE
PROCEEDING.
OPERATOR MUST BE PROPERLY GROUNDED AND
PERMANENTLY WIRED IN ACCORDANCE WITH
LOCAL ELECTRICAL CODES. NOTE: THE
OPERATOR SHOULD BE ON A SEPARATE FUSED
LINE OF ADEQUATE CAPACITY.
ALL ELECTRICAL CONNECTIONS MUST BE MADE
BY A QUALIFIED INDIVIDUAL.
WARNING
CAUTION
WARNING
WARNING
TO AVOID DAMAGE TO DOOR AND OPERATOR,
MAKE ALL DOOR LOCKS INOPERATIVE. SECURE
LOCK(S) IN "OPEN" POSITION.
IF THE DOOR LOCK NEEDS TO REMAIN
FUNCTIONAL, INSTALL AN INTERLOCK SWITCH.
1. Be sure that the power supply is of the correct
voltage, phase, frequency, and amperage to supply
the operator. Refer to the operator nameplate on the
cover.
2. Using the 1-1/16” dia conduit access
knockout as shown below, bring supply lines to the
operator and connect wires to the terminals indicated
on the WIRING CONNECTIONS DIAGRAM.
DO NOT TURN POWER ON UNTIL YOU HAVE
FINISHED MAKING ALL POWER AND CONTROL
WIRING CONNECTIONS AND HAVE COMPLETED
THE LIMIT SWITCH ADJUSTMENT PROCEDURE.
IMPORTANT: THIS UNIT MUST BE PROPERLY
GROUNDED. A GROUND SCREW IS SUPPLIED IN
THE ELECTRICAL BOX FOR CONNECTION OF
THE POWER SUPPLY GROUND WIRE. FAILURE
TO PROPERLY GROUND THIS UNIT COULD
RESULT IN ELECTRIC SHOCK AND SERIOUS
INJURY.
POWER WIRING

8
CONTROL WIRING
Standard C2 or B2 Wiring
Standard operators are shipped from the factory with
jumper set for C2 wiring, which requires constant
pressure on button to close the door. If momentary
contact on close direction is desired (B2 wiring) you
must include an entrapment protection device. See
close control jumper setting below.
Constant pressure on close (C2 wiring)
Red jumper wire was placed on terminal #2 in
electrical enclosure. The operator will require
constant pressure on close control in order to keep
door moving in the close direction.
Momentary contact on close (B2 wiring)
Move red jumper wire from terminal #2 to terminal
#3. The operator will require only momentary
contact to close the door.
WIRING DIAGRAM
This Operator has
Control Wiring.
SUPPLEMENTAL WIRING DIAGRAM(S)
REPLACEMENT WIRING DIAGRAM
Note: Supplemental Wiring Diagrams are
to be used in addition to 1742-1.
Replacement Wiring Diagram is to be used
in place of 1742-1.
SPECIAL CONTROL
WIRING DATA
LOCATING THE CONTROL STATION
All operators are supplied with some type of control station. Generally a three button station
(OPEN/CLOSE/STOP) is provided. A two-position key switch or control station (OPEN/CLOSE) may be added or
substituted when requested at the time of order. Mount the control station near the door.
WARNING
INSTALL THE CONTROL STATION WHERE THE DOOR
IS VISIBLE, BUT AWAY FROM THE DOOR AND ITS
HARDWARE. IF CONTROL STATION CANNOT BE
INSTALLED WHERE DOOR IS VISIBLE, OR IF ANY
DEVICE OTHER THAN THE CONTROL STATION IS
USED TO ACTIVATE THE DOOR, A REVERSING EDGE
MUST BE INSTALLED ON THE BOTTOM OF THE DOOR.
FAILURE TO INSTALL AREVERSING EDGE UNDER
THESE CIRCUMSTANCES MAY RESULT IN SERIOUS
INJURYOR DEATH TO PERSONS TRAPPED
BENEATH THE DOOR.
WARNINGW A R N I N G
TO PREVENT ENTRAPMENT
DO NOT START DOOR DOWNWARD
UNLESS DOORWAY IS CLEAR
OPEN
CLOSE
STOP
Standard
Control Station
WARNING Notice
Push
Buttons
IMPORTANT: Mount WARNING NOTICE beside or
below the push button station.
MOUNT WARNING NOTICE
DETERMINE WIRING TYPE
Refer to the wiring diagram located on the inside cover the electrical box to determine the type of control wiring.
Wiring Diagram label on inside cover
of electrical box
Wiring
Type
SPECIAL CONTROL WIRING
If your operator was shipped from the factory with
non-standard control wiring or with optional acces-
sories that require addition instructions, refer to the
wiring diagram(s) indicated in the special control
wiring data box. When a replacement wiring diagram
is present, wiring diagrams in this manual will not
apply. Refer only to the replacement wiring diagram
for all connections.
IMPORTANT NOTE: If your wiring diagram is missing,
or you are unsure of the wiring type for your operator, con-
tact the customer service department @ 1-800-528-2806.

9
CONTROL WIRING (con’t)
Radio Controls
On all models with type B2 control wiring, a terminal
bracket marked R1 R2 R3 is located on the outside of
the electrical enclosure. All standard radio control
receivers (single channel residential type) may be
mounted to this bracket. The operator will then open
a fully closed door, close a fully open door, and
reverse a closing door from the radio transmitter.
However, for complete door control from a
transmitter, a commercial three-channel radio set
(with connections for OPEN/CLOSE/STOP) is
recommended.
Additional Access Control Equipment
Locate any additional access control equipment as desired (but so that the door will be in clear sight of the
person operating the equipment), and connect to the terminal block in the electrical enclosure as shown on the
FIELD WIRING CONNECTIONS diagram. Any control with a normally (N.O.) isolated output contact may be
connected in parallel with the OPEN button. More than one device may be connected in this manner. Use 16
gauge wire or larger for all controls. DO NOT USE THE CONTROL CIRCUIT TRANSFORMER (24VAC) IN THE
OPERATOR TO POWER ANY ACCESS CONTROL EQUIPMENT OTHER THAN A STANDARD RESIDENTIAL
TYPE RADIO RECEIVER.
External Interlock Switch
The operator has a terminal connection for an external interlock switch. This switch must be a normally closed
(N.C.) two-wire device with a contact rating of at least 3 amps @ 24VAC. When such a switch is connected as
shown on the FIELD WIRING CONNECTIONS diagram, the control circuit will be disabled when the switch is
actuated, thereby preventing electrical operation of the door from the control devices.
WARNING
CAUTION
WARNING
WARNING
DO NOT USE RADIO CONTROLS WITH YOUR
OPERATOR UNLESS YOU HAVE INSTALLED
SOME TYPE OF ENTRAPMENT PROTECTION
DEVICE. THE USE OF RADIO CONTROLS
PRESENTS POTENTIAL HAZARDS DUE TO THE
USER’S ABILITY TO OPEN OR CLOSE THE
DOOR WHEN OUT OF SIGHT OF THE DOOR. IN
ADDITION, IF A SINGLE CHANNEL CONTROL IS
USED, THE USER WILL NOT BE ABLE TO STOP
THE DOOR FROM THE TRANSMITTER.
CLUTCH ADJUSTMENT
1. Remove cotterpin from nut on the clutch shaft.
2. Back off clutch nut until there is very little tension
on the clutch spring.
3. Tighten clutch nut gradually until there is just
enough tension to permit the operator to move the
door smoothly but to allow the clutch to slip if the door
is obstructed. When the clutch is properly adjusted, it
should generally be possible to stop the door by hand
during travel.
4. Reinstall Cotterpin.
CAUTION: The adjustable friction clutch is NOT
an automatic reversing device. An electric or
pneumatic reversing edge can be added to
bottom edge of door if desired.
Cotterpin
Adjusting Nut
Spring
Clutch Pulley
Clutch Plate
Clutch Pad
Washer

10
EMERGENCY DISCONNECT SYSTEM
Header
Bracket
Straight
Door Arm
Assembly
Emergency
Release
Handle
Door
Bracket
Door
Chain
Clevis
Pin
Trolley
Emergency
Disconnect
Track
Pull emergency
release handle
straight down.
Emergency disconnect
will open.
Emergency
Disconnect
Curved
Door Arm
Door Arm
Lift free end of
door arm to trolley.
Pull emergency handle
to allow arm to engage
roll pin. Release handle.
Emergency disconnect
will close.
Emergency
Disconnect
Door Arm
NOTICE
TO DISCONNECT DOOR FROM OPENER
TO RECONNECT DOOR ARM TO TROLLEY
DOOR ARM IS RELEASED FROM TROLLEY WHEN
EMERGENCY DISCONNECT OPENS.
TO AVOID BEING STRUCK BY DOOR ARM, DO NOT
STAND UNDER THE ROPE OR DOOR ARM WHEN
PULLING THE EMERGENCY RELEASE.
WARNING
CAUTION
WARNING
WARNING
TEST THE SYSTEM
Turn on power. Test all controls and safety devices
to make sure they are working properly. It will be
necessary to refer back to page 6 for fine adjustment
of the limit switches.
IMPORTANT NOTES:
Do not leave operator power on unless all safety
and entrapment protection devices have been
tested and are working properly.
Be sure you have read and understand all Safety
Instructions included in this manual.
Be sure the owner or person(s) responsible for
operation of the door have read and understand
the Safety Instructions, know how to electrically
operate the door in a safe manner, and know how
to use the manual disconnect operation of the
door operating system.
WARNING
CAUTION
WARNING
WARNING
DO NOT PLACE HANDS OR TOOLS IN OR
NEAR THE OPERATOR WHEN THE POWER IS
ON OR WHEN TESTING CONTROL OR SAFETY
DEVICES. ALWAYS DISCONNECT POWER
BEFORE SERVICING OR ADJUSTING THE
OPERATOR.