Install The Header Bracket - Chamberlain Merlin Whisper Drive MT3850 Installation And Operating Instructions Manual

INSTALLATION STEP 2

Install the Header Bracket

NOTE: Refer to vertical centre and horizontal lines
created in Step 1 for proper placement of header
bracket.
Wall mount: Centre the header bracket on the vertical
centre line with the bottom edge of the header bracket on
the horizontal line (with the arrow pointing toward the
ceiling). Mark all of the header bracket holes. Then drill
4.5mm pilot holes and fasten the header bracket with
coach bolts.
HARDWARE
Coach Bolt
Ceiling mount: Extend vertical centre line onto the
ceiling. Centre the header bracket on the vertical mark no
more than 150mm (6") from the wall. Make sure the arrow
is pointing toward the opener. Mark all of the header
bracket holes, then drill 4.5mm pilot holes and fasten the
header bracket with coach bolts. For concrete ceiling
mount, use concrete anchors provided.
Centre Line
Horizontal Line
200mm
50 to 200mm
(depending on
door type)
50mm
Ceiling Mount
Header Bracket
150mm
(6")
9
Wall Mount
Header Bracket
(C Doors)
Coach Bolt
(A & B Doors)
Centre Line
(A , B & C Doors)
Coach Bolt