Chamberlain WHISPER DRIVE HD900D - Manual (Page 19)

19
To prevent possible SERIOUS INJURY or DEATH from a falling
garage door:
• If possible, use emergency release handle to disengage
trolley ONLY when garage door is CLOSED. Weak or broken
springs or unbalanced door could result in an open door
falling rapidly and/or unexpectedly.
• NEVER use emergency release handle unless garage
doorway is clear of persons and obstructions.
• NEVER use handle to pull door open or closed. If rope knot
becomes untied, you could fall.
Trolley
Release Arm
NOTICE Emergency
Release Handle
Overhand
Knot
Trolley
INSTALLATION STEP 9
Attach the Emergency Release Rope and Handle
• Thread one end of the rope through the hole in the top of the
red handle so “NOTICE” reads right side up as shown. Secure
with an overhand knot at least 1" (2.5 cm) from the end of the
rope to prevent slipping.
• Thread the other end of the rope through the hole in the
release arm of the outer trolley.
• Adjust rope length so the handle is 6 feet (1.8 m) above the
floor. Ensure that the rope and handle clear the tops of all
vehicles to avoid entanglement. Secure with an overhand knot.
NOTE: If it is necessary to cut the rope, heat seal the cut end with
a match or lighter to prevent unraveling.