Chamberlain T User Manual

7
TO AVOID SERIOUS PERSONAL INJURY OR DEATH FROM
ELECTROCUTION, DISCONNECT ELECTRIC POWER BEFORE
MANUALLY MOVING LIMIT NUTS.
WARNING
CAUTION
WARNING
WARNING
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 actuator.
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
OPEN Limit Switch
Actuator
(Aux. Open) Limit Switch
PHOTO EYES & SENSING EDGES
Sensing devices supplied for door industry type operators
with an isolated normally open (N.O.) dry contact output
are compatible with your operator. This includes
pneumatic and electric edges, and through beam and retro
reflective photo eyes. If your door does not have bottom
safety photo eyes or a sensing edge 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
provided with the edge. The sensing edge may be
electrically connected by either coiled cord or take-up reel.
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
operator 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 diagrams supplied on pages 13 and 14. See
field connection terminals identified as Reversing Device.
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 strongly recommended that a SAFETY PHOTO EYE OR
SENSING EDGE BE USED IN CONJUNCTION WITH THE
OPERATOR.
WARNING
CAUTION
WARNING
WARNING
NOTICE
LIMIT SWITCH ADJUSTMENT

Chamberlain T Specifications

General

Brand	Chamberlain
Model	T
Category	Garage Door Opener
Language	English