Install The Protector System; As Measured On The Bottom Of The Door Is - Chamberlain Merlin MR850 Installation And Operating Instructions Manual

INSTALL THE PROTECTOR SYSTEM™ (IR BEAMS)
17
NOTE: This accessory must be used for all
installations where the closing force as measured
on the bottom of the door is over 400N (40kgf).
After the opener has been installed and adjusted, the
Protector System™ accessory can be installed.
Instructions are included with this accessory.
The Protector System™ provides an additional
measure of safety against a small child or animal
being trapped under a garage door. It uses an infra-
red beam, which when broken by an obstruction,
causes a closing door to open and prevents an open
door from closing and is strongly recommended for
homeowners with young children.
NOTE: The opener will automatically detect the
Protector System TM
operating for 5 minutes (during this time the
beams must remain unobstructed). The opener
will not close unless the beams are aligned.
Whilst Chamberlain have engineered safety features into your garage door opener, we urge you to consider fitting
IR Beams to your new garage door opener. In many countries these devices are compulsory to assist in
preventing serious injury or property damage. For your own peace of mind and the safety of others please install
this inexpensive safety device.
Setting auto close (optional)
NOTE: The Protector System
to enable this feature.
Auto close is NOT recommended for
households with young children.
The auto close feature will automatically close the
garage door after the preset time. The time can be
adjusted up to 180 seconds using the trim pot located
on the control board. Auto close can be disabled by
adjusting the trim pot to 0s.
Installing and adjusting:
• Turn the opener off

• Install the Protector System

wires and instructions provided with the product.
Twist the two white (only) wires together and
terminate them into the white (2) terminal. Twist the
two white/black wires together and terminate them
into the grey (3) terminal.
• Ensure the trim pot on the opener is set to 0s.
• Turn the opener on
• Allow 5 minutes for the beams to self-learn to the
unit, (do not walk through the beam during this time).
• Adjust the trim pot to the desired closing time.
Door may operate unexpectedly, therefore do not allow anything to stay in the path of the door.
when it is installed and
TM MUST be installed
TM
using the brackets,
IR Beams must be installed
to detect a 100mm high
obstacle at any point along
Red LED
MUST BE ON
IR Beam
SAFETY FIRST!
180s
0s
50s
9
the floor.
IR Beam
A. Strip wire
(11 mm)
7/16" (11 mm)
B. Twist like coloured
wires together
C. To insert or release
wire, push in tab with
screwdriver tip
Grey White
Red
Quick-Connect Terminals
Red LED
MUST BE ON