Chamberlain Merlin Whisper Drive MT3850 Installation And Operating Instructions Manual page 17

Sectional garage door opener
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INSTALLATION STEP 8
Install the C198
LCD Motion Detecting Control
There are 2 screw terminals on the back of the door control.
Strip about 6mm of insulation from bell wire. Separate wires
enough to connect the white/red wire to R terminal screw 1
and the white wire to W terminal screw 2.
Fasten the door control to an inside garage wall with sheet
metal screws provided. Drill 4mm holes and use anchors if
installing into plasterboard wall. A convenient place is beside
the service door and out of reach of children.
Run the bell wire up the wall and across the ceiling to the
garage door opener. Use insulated staples to secure wire.
The receiver quick connect terminals are located behind the
light lens of the opener. Connect the bell wire to the
terminals as follows: white/red to red and white to white.
Operation of the Door Control
Press to open or close the door. Press again to stop the
door while moving.
NOTE: Refer to pages 23 and 25 for additional
instructions.
Screw
Control Panel (std installation)
Screw
Control Panel (pre-wired)
REMOVE & REPLACE COVER
Push Bar Cover
Bell
Wire
HARDWARE
Plaster Wall Anchors
PRE-WIRED INSTALLATION
Wall box not provided
24 Volt Bell Wire
Top
Mounting
Hole
Terminal
Screws
W
R
Bottom
2
1
Mounting
Hole
(BACK VIEW)
To prevent possible SERIOUS INJURY or DEATH from
electrocution:
• Be sure power is NOT connected BEFORE installing door
control.
• Connect to low voltage inputs ONLY as illustrated (Figure 1).
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 1.5m, 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.
• Fasten the caution label permanently to the wall near the door as
a reminder of safe operating procedures.
• ALWAYS keep garage door in sight until completely closed.
NEVER permit anyone to cross path of a closing garage door.
16
Figure 1
6mm
red white
To release wires
press tab with a
screwdriver or pen

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