Chamberlain GH Owner's Manual page 15

ENTRAPMENT PROTECTION ACCESSORIES (OPTIONAL)
SENSING EDGES
All types of sensing edges with an isolated normally
open (N.O.) output are compatible with your
operator. This includes pneumatic and electric
edges. If your door does not have a bottom sensing
edge and you wish to purchase one, contact the
supplier of your operator.
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. 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
operator electrical box in accordance with local
codes.
MAKE SURE THE LIMIT NUTS ARE POSITIONED BETWEEN THE LIMIT SWITCH ACTUATORS BEFORE
PROCEEDING WITH ADJUSTMENTS.
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.
CLOSE Limit Switch
SAFETY
(Aux. Close) Limit Switch
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.
LIMIT SWITCH ADJUSTMENT
If other problems persist, call our toll-free number for
assistance - 1-800-528-2806.
6
IT IS STRONGLY RECOMMENDED THAT A
SENSING EDGE OR OTHER ENTRAPMENT
PROTECTION DEVICE
CONJUNCTION WITH THIS OPERATOR.
WARNING
TO AVOID SERIOUS PERSONAL INJURY OR DEATH
FROM ELECTROCUTION, DISCONNECT ELECTRIC
POWER BEFORE MANUALLY MOVING LIMIT NUTS.
BE USED IN
OPEN Limit Switch
Actuator
Retaining Plate