Chamberlain 3900PLD 用户手册

7

NOTE: For additional mounting options see
accessories page.
1.   Close the door completely.
2.  Slide the operator with collar over the end of the torsion 

bar. Ensure that the collar does not touch the bearing 
plate. Check to make sure the mounting bracket is 
located on a solid surface such as wood, concrete or 
door/flag bracket. Snug collar screws to help assure 
proper alignment of operator. Mark the bracket holes. It 
may be necessary to cut the torsion bar if it is too long 
or damaged.

3. Loosen collar screws from torsion bar and remove the 

operator. Drill 3/16" pilot holes at the marked locations. 
Drill through steel plate if needed.

4.  Reinstall the operator by sliding the collar over the 

torsion bar until pilot holes align with bracket. Securely 
tighten collar screws that attach to the torsion bar to 
12-14 ft./lbs. of torque. Securely tighten both set screws 
firmly, without damaging the motor unit.

5.  Fasten bracket securely with 14-10x1-7/8" screws. 

Tighten all mounting bracket hardware.

NOTE: The motor unit does not have to be flush to wall.
6.  Use a staple to secure the antenna wire to prevent 

antenna from being entangled in a door roller.

To prevent possible SERIOUS INJURY or DEATH:
•   Concrete anchors MUST be used if mounting bracket into 

masonry.

•   NEVER try to loosen, move or adjust door, springs, cables, 

pulleys, brackets or their hardware, ALL of which are under 
EXTREME tension. 

•   ALWAYS call a trained door systems technician if door 

binds, sticks or is out of balance. An unbalanced door might 
not reverse when required.

•  Operator MUST be mounted at a right angle to the torsion 

bar to avoid premature wear on the collar.

 Operator

Staple

Torsion Bar

14-10x1-7/8" Hex Screw

  1.  READ AND FOLLOW ALL INSTALLATION WARNINGS AND 

INSTRUCTIONS.

  2.  Install door operator ONLY on properly balanced and 

lubricated 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 operator.

  4.  Disable ALL locks and remove ALL ropes connected to door 

BEFORE installing operator to avoid entanglement.

  5   Mount emergency release handle no higher than 6 feet 

(1.83 m) above floor.

  6.  NEVER connect door operator to power source until 

instructed to do so. 

  7.  NEVER wear watches, rings or loose clothing while installing 

or servicing operator. They could be caught in door or 
operator mechanisms.

  8.  Install wall-mounted door control:  
 

• within sight of the door. 

 

•  out of reach of children at minimum height of 5 feet

(1.5 m).

 

• away from ALL moving parts of the door.

  9.  Install the entrapment warning placard next to the control 

station in a prominent location.

10.  Place manual release/safety reverse test label in plain view 

on inside of door.

11.  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 flat) on the floor.