Chamberlain Merlin Professional MR1000 Installation And Operating Instructions Manual page 7

11 LEFT / RIGHT HAND INSTALLATION
roller:L
R
roller:L
R
LEFT
Setting left / right operation
The opener must be set to either left or right hand
operation via the dip switch located under the green
activation button.
• Gently pry the flap down and away from the opener
using a screw driver or pen.
• Adjust the two direction dip switches located under
the green plate to "R" for right hand doors or "L" for
left hand doors.
NOTE: Leave green plate off for control setting.
Inside garage looking out
6
fig 1
roller:L
R
roller:L
R
open
60s
180s
timer to
close
0s/off
operate
learn
close
roller:L
R
roller:L
R
RIGHT