Testing Door; Installing Stop Collar/Weight Bar - Chamberlain Merlin MR850 Installation And Operating Instructions Manual

4 TESTING THE DOOR
Complete the following test to ensure your door is well
balanced, and not sticking or binding:
• Disable all locks and remove any ropes connected to the
garage door.
• Lift the door to about halfway and then release it. The
door should remain spring balanced.
• Raise and lower the door to determine if there are any
sticking or binding points.
• If your door does not hold in place or the door binds or
sticks, call a qualified door technician before installing the
opener.
5 INSTALLING THE STOP COLLAR
• Install the stop collar on the opposite end to where
the opener is to be installed.
• Fit the stop collar hard against the boss of the door
drum. Ensure the U-bolt holding the door shaft to the door
bracket is tightly secured.
6 INSTALLING THE WEIGHT BAR (PROVIDED)
• Place the weight in the centre of the door (as shown).
• Use a pencil to mark the two hole positions.
• Drill two 5.5mm holes through the two marked positions,
then place the weight bar on the inside of the door.
• Use the 5mm bolts, washers and nuts (provided) to
fasten the weight bar in place.
Non opener side
SAFETY CHECK!
Is the stop collar
installed?
YES: proceed to the next
step
NO: install the stop collar
before proceeding
3
Opener Side
WEIGHT BAR