Chamberlain 3850 User Manual download pdf (Page 15)

INSTALLATION STEP 10

Electrical Requirements

To avoid installation difficulties, do not run the opener

at this time.

To reduce the risk of electric shock, your garage door

opener has a grounding type plug with a third grounding

pin. This plug will only fit into a grounding type outlet. If

the plug doesn’t fit into the outlet you have, contact a

qualified electrician to install the proper outlet.

If permanent wiring is required by your local code,

refer to the following procedure.

To make a permanent connection through the 7/8" (2 cm)

hole in the top of the motor unit:

• Remove the motor unit cover screws and set the cover

aside.

• Remove the attached 3-prong cord.

• Connect the black (line) wire to the screw on the brass

terminal; the white (neutral) wire to the screw on the

silver terminal; and the ground wire to the green ground

screw. The opener must be grounded.

• Reinstall the cover.

To avoid installation difficulties, do not run the opener

at this time.

RIGHT

WRONG

To prevent possible SERIOUS INJURY or DEATH from

electrocution or fire:

• Disconnect ALL electric and battery power BEFORE

performing ANY service or maintenance.

• Garage door installation and wiring MUST be in compliance

with ALL local electrical and building codes.

• NEVER use an extension cord, 2-wire adapter, or change plug

in ANY way to make it fit outlet. Be sure the opener

is grounded.

Ground Tab

Green

Ground Screw

Ground Wire

Black Wire

PERMANENT WIRING

CONNECTION

White Wire

Black

Wire

NOTICE

Overhand

Knot

Emergency

Release Handle

Overhand

Knot

Trolley

Release

Arm

Rope

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.

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.

WARNING

CAUTION

WARNING

CAUTION

WARNING

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Chamberlain 3850 User Manual Page 15

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