Chamberlain GT Owner's Manual page 5

9. Raise operator straight up until the door can be
raised to the full open position. See Figure 5.
Temporarily secure to ceiling or rafters with rope
or other suitable means.
WARNING
FAILURE TO SUSPEND
SECURELY MAY RESULT IN SERIOUS PERSONAL
INJURY OR DEATH, AND/OR PROPERTY DAMAGE.
10. Raise door to full open position. Place a 2x4
board on top of leading edge of door. Lower
operator to rest on 2x4 board.
Make four hangers from 2"x2"x1/4" angle iron. IT IS
RECOMMENDED THAT RAIL BE CENTER-
SUPPORTED AS WELL. Bolt the operator into place.
2"x2"x1/4"
Angle Iron
Reversing
Edge
THE OPERATOR
Building
Support
5V dc Control
Trolley
Door
Arm
Track
Spacer
Door
Bracket
Rope
Release
Center
Stile
COIL CORD (OPTIONAL)
REFER TO (A) IN ILLUSTRATION
Connect operator end of coil cord to junction box (not
supplied) fastened to the wall approximately half-way
up the door opening.
Electrician must hardwire the junction box to the
operator electrical box in accordance with local
codes.
REFER TO (B) IN ILLUSTRATION
Take-up reel should be installed 12" above the top of
the door.
FIGURE 5
Wiring
B
A
Air Hose
Pneumatic Air Switch
Not Required or Supplied
When Electric Sensing
5
REEL (OPTIONAL)
Hanger Angles
2"x2"x1/4"
Edge is Used