Tighten The Chain; Installation; Important Installation Instructions - LiftMaster MERIK SECURITY+ 790LMK Manual Del Propietário

ASSEMBLY STEP 5

Tighten the Chain

• Spin the inner nut and lock washer down the trolley threaded
shaft, away from the trolley.
• To tighten the chain, turn outer nut in the direction shown.
AS YOU TURN THE NUT, KEEP THE CHAIN FROM TWISTING.
• When the chain is approximately 13 mm above the base of
the rail at its midpoint, re-tighten the inner nut to secure the
adjustment.
Sprocket noise can result if chain is either too loose or too
tight.
NOTE: When installation is complete, you may notice some chain
droop with the door closed. This is normal. If the chain returns to
the position shown when the door is open, do not re-adjust the
chain.
NOTE: During future maintenance, ALWAYS pull the emergency
release handle to disconnect trolley before adjusting chain.
You have now finished assembling your garage door opener.
Please read the following warnings before proceeding to the
installation section.

INSTALLATION

IMPORTANT INSTALLATION INSTRUCTIONS

To reduce the risk of SEVERE INJURY or DEATH:
1. READ AND FOLLOW ALL INSTALLATION WARNINGS AND
INSTRUCTIONS.
2. Install garage door opener ONLY on properly balanced and
lubricated garage door. An improperly balanced door may
NOT reverse when required and could result in SEVERE
INJURY or DEATH.
3. ALL repairs to cables, spring assemblies and other hardware
MUST be made by a trained door systems technician BEFORE
installing opener.
4. Disable ALL locks and remove ALL ropes connected to garage
door BEFORE installing opener to avoid entanglement.
5. Install garage door opener 7 feet (2.13 m) or more above
fl oor.
6. Mount the emergency release within reach, but at least 6 feet
(1.8 m) above the fl oor and avoiding contact with vehicles to
avoid accidental release.
7. NEVER connect garage door opener to power source until
instructed to do so.
To Tighten Outer Nut
To Tighten Outer Nut
WARNING
WARNING
WARNING WARNING
8. NEVER wear watches, rings or loose clothing while installing
or servicing opener. They could be caught in garage door or
opener mechanisms.
9. Install wall-mounted garage door control:
• within sight of the garage door.
• out of reach of children at minimum height of
5 feet (1.5 m).
• away from ALL moving parts of the door.
10. Place entrapment warning label on wall next to garage door
control.
11. Place manual release/safety reverse test label in plain view
on inside of garage door.
12. Upon completion of installation, test safety reversal system.
Door MUST reverse on contact with a 1-1/2" (3.8 cm) high
object (or a 2x4 laid fl at) on the fl oor.
15
15
Lock
Lock
Washer
Outer Nut Outer Nut Washer
Inner Nut
Inner Nut
To Tighten
To Tighten
Inner Nut
Inner Nut
Chain
Chain
13 mm 13 mm
Base of Rail
Base of Rail