Chamberlain 3255-2M 1/2 HP Manuale Utente

LOCK

LIGHT

To prevent possible SERIOUS INJURY or DEATH from
electrocution:
• Be sure power is NOT connected BEFORE installing door

control.

• Connect ONLY to 24 VOLT low voltage wires.
To prevent possible SERIOUS INJURY or DEATH from a closing
garage door:
• Install door control within sight of garage door, out of reach

of children at a minimum height of 5 feet (1.5 m), and away
from ALL moving parts of door.

• NEVER permit children to operate or play with door control

push buttons or remote control transmitters.

• Activate door ONLY when it can be seen clearly, is properly

adjusted, and there are no obstructions to door travel.

• ALWAYS keep garage door in sight until completely closed.

NEVER permit anyone to cross path of closing garage door.

INSTALLATION STEP 6

Install the Door Control

Locate door control within sight of door at a minimum

height of 5 feet (1.5 m) where small children cannot reach,

and away from moving parts of door and door hardware.

The installation surface must be smooth and flat. If

installing into drywall (Figure 1), drill 5/32" holes and use

anchors provided. For pre-wired installations (as in new

home construction), it may be mounted to a single gang

box (Figure 2).

NOTE: After installation, a green or amber

indicator light behind the cover will indicate proper

connection. If not lit, the Lock and Light features will not

function (reverse wires to correct).
1. Strip 7/16" (11 mm) of insulation from one end of bell

wire and connect to the two screw terminals on back of

door control by color: white wire to WHT and white/red

wire to the RED (Figure 3).

2. Remove cover by gently prying at slot in the side of the

cover with a small flat head screwdriver (Figure 4).

Fasten with 6ABx1-1/4" self-tapping screws (drywall

installation) or 6-32x1" machine screws (into gang box)

as follows:

•

Drill and install bottom screw, allowing 1/8" (3 mm) to

protrude above wall surface.

•

Position bottom of door control on screw head and

slide down to secure. Adjust screw for snug fit.

•

Install top screw with care to avoid cracking plastic

housing.

DO NOT overtighten.

•

Insert bottom tabs and snap on cover.

NOTE: The push bar may stick if the door control is not

mounted on a smooth surface. If a click is not heard

when pressing the push bar, loosen the two mounting

screws or relocate the door control to a smoother

surface.

(Standard installation only) Run bell wire up wall and

across ceiling to motor unit. Use insulated staples to

secure wire in several places. Do not pierce wire with a

staple, creating a short or open circuit.

4. Strip 7/16" (11 mm) of insulation from end of bell wire.

Connect bell wire to the quick-connect terminals as

follows: white to white and white/red to red (Figure 5).

NOTE: When connecting multiple door controls to the

opener, twist same color wires together. Insert wires into

quick-connect holes: white to white and red/white to red.

5. Use tacks or staples to permanently attach entrapment

warning label to wall near door control, and manual

release/safety reverse test label in a prominent location

on inside of garage door.

NOTE: DO NOT connect power and operate opener at

this time. The trolley will travel to the full open position but

will not return to the close position until the sensor beam

is connected and properly aligned.

To release or insert wire,
push in tab with screwdriver tip

Door Control
Connections

7/16" (11 mm)

Strip wire 7/16" (11 mm)

Red

Grey

White

LOCK

LIGHT

Slot

Drywall Anchors

Insulated Staples

Screw 6ABx1-1/4"
(standard installation)

Screw 6-32x1"(pre-wired)

HARDWARE SHOWN ACTUAL SIZE

LOCK

LIGHT

Figure 5

Figure 3

Figure 1

Figure 2

Figure 4

MULTI-FUNCTION
DOOR CONTROL (BACK)

REMOVE COVER

PRE-WIRED INSTALLATION

To Replace
Insert Bottom Tabs First

24 Volt
Bell Wire

Top Mounting Hole

Terminal
Screws

Bell Wire

Bottom Mounting Hole

STANDARD
INSTALLATION