EDR4 1169 G 10/03
14
Adding the Merlin M102 non-
contact beam sensor (Optional)
Non-contact beam sensors are optional but Merlin strongly suggests they be fitted for in-
creased levels of safety. They may be fitted at any time. If sensors are fitted the opener will
only close when the sensors are fully functional and where their beam is unobstructed. The
door can open regardless of the sensor beam.
The sensors should be placed either side of the door opening, within 300mm of the door’s
opening, and within 100mm of the floor. Choose positions that will protect the sensors from
accidental impact or water. The receiving sensor should not be placed where it will be sub-
jected to bright direct sunlight. The high level of Infra Red light in bright sunlight may tempo-
rarily prevent normal operation of the opener.
Switch off the power to the opener. Run the pair of cables from each sensor back to the
accessory terminals marked ‘beam sensor’ on the rear of the opener.
There is no need to connect the cables with
any particular polarity.
Switch the power to the opener back on. Aim
the sensors at each other using the adjustments
provided. When correctly aligned and unob-
structed the sensor LEDs will stop flashing and
stay on continuously.
If the beam is obstructed or if the sensors are
not functioning then the door may still be closed
by holding the manual control button down for
at least two seconds, and keeping it held until
the door is closed.
Improving the door security
If there is a clear gap above the top of the closed door it is possible in some cases for people
to gain unauthorised access to the garage after an opener is fitted. A piece of stiff wire can
sometimes be threaded through the gap to hook onto the safety release rope or lever. You
can improve the security by adding a strip of metal or wood over any gap to block access in
this manner.
Manually operating the door
The garage door opener can be disengaged from the garage door to enable the door to be
operated manually.
