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7

Setting the Force

The force, as measured on the closing edge of the door,
should not exceed 400N (40kgf). If the closing force is
measured to more than 400N, the Protector System must
be installed. See section 14.
The force setting regulates the amount of power required

to open and close the door.

• Press the PURPLE button (1) twice to enter opener into

Force Adjustment Mode. The indicator light (2) will flash
quickly.

• Press the green start button (4) on the bottom of the

opener. The door will travel to the DOWN limit. Press the

green start button (4) again, the door will travel to the
UP limit. Press the green start button (4) again to
complete the travel cycle. The indicator light (2) will stop
flashing when the force has been learned.

• The door must travel through a complete cycle, UP and

DOWN, in order for the force to be set properly. If the
opener cannot open and close your door fully, inspect
your door to insure that it is balanced properly and is not

sticking or binding.

12

Testing the Safety Reverse System

The safety reverse system test is important. The
garage door must reverse on contact with a 40mm
obstacle laid flat on the floor. Failure to properly
adjust the opener may result in serious personal
injury from a closing garage door. 
Operate the door in
the down direction. The door must reverse on the
obstruction. If the door stops on the obstruction, remove
obstruction and repeat limit and force setting, sections 11
& 12, pages 6 & 7. Repeat test.

13

Install the Protector System™

(Safety Beams)

Install this accessory for all installations where the
closing force as measured on the bottom of the
door is over 400N (40kgf).
After 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 being
caught 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 when it is installed and operating for
5 minutes (during this time the beams must remain
unobstructed). The opener will not close unless the
sensors are aligned.

14

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2

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4

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Summary of Contents for Merlin Professional MR800

Page 1: ...professional N2966 professional Installation and operating instructions for Merlin garage door opener Model MR800 www chamberlainanz com...

Page 2: ...is accessory allows manual operation of the garage door from outside in case of power failure Keep garage door balanced Do not let the garage door opener compensate for a binding or sticking garage do...

Page 3: ...and lower the door to discover if there are any sticking or binding points If your door spring does not hold the door in place or the door binds or sticks call a qualified door technician before auto...

Page 4: ...ved manually NOTE To re engage the opener pull the release cord across and up For right hand side installations the wire jumper should be in place factory installed Set Opener Position Left or Right h...

Page 5: ...move any ropes used Plug opener into nearby power point and switch on power point opener lights should now turn on FOR LEFT HAND INSTALLATIONS REFER SECTION 5 page 3 Ensure that the opener position ju...

Page 6: ...re with an overhand knot at least 25mm from the end of the rope to prevent slipping Thread the other end of the rope through the loop of the manual release cable Adjust rope length so the handle is no...

Page 7: ...he indicator light 2 will stop flashing when the limits have been learned NOTE If the door presses excessively on the floor or reverses before it reaches the floor use the Manual Limit setting option...

Page 8: ...rage door must reverse on contact with a 40mm obstacle laid flat on the floor Failure to properly adjust the opener may result in serious personal injury from a closing garage door Operate the door in...

Page 9: ...he white quick connect terminal The Protector System Safety Beams Connect both white wires to the white quick connect terminal and both white black wires to the grey quick connect terminal Flashing li...

Page 10: ...nd force setting in section 11 12 pages 6 7 Repeat safety reverse test after adjustments 9 The opener strains to operate door The door may be out of balance or the springs may be broken Close the door...

Page 11: ...llow a 15 minute cooling period after 4 minutes of continuous operation of the opener Opening the Door Manually Door should be fully closed if possible Weak or broken springs could allow an open door...

Page 12: ...r Operator Unit that it is free from defects in material and or workmanship for a period of 2 YEARS from the date of first purchase from the Seller Please retain your proof of purchase in the unlikely...

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