Door Requirements - Chamberlain Merlin MJ3800 Installation And Operating Instructions Manual

DOOR REQUIREMENTS

Survey the area to see if any of the conditions
below apply to your installation. Additional
materials may be required. You may find it helpful
to refer back to this page as you proceed with the
installation of your opener.
Depending on your requirements, there are several
installation steps which may call for materials or
hardware not included in the carton.
This opener is compatible with:
• Doors that use a torsion bar, springs and a door
no more than 4.2m (14') high.
• 100mm - 150mm drums (4" to 6"), NOT TO BE
USED on tapered drums over 150mm (6").
• High lift and standard lift sectional doors up to
4.2m (14') high.
• Doors up to 5.5m (18') wide.
• Doors up to 16m (170 sq ft)
2
• 25mm (1") torsion bar only.
• Review or inspect proposed installation area.
Opener can be installed on left or right side of
door. Select the side that meets the
requirements listed below.
• Must have minimum of 64mm (2 1/2") between
the wall and the center of the torsion bar.
• Must have minimum of 76mm (3") between the
ceiling and the center of torsion bar.
Opener
Powered
Door Lock
Cable Tension
Monitor
Gap between floor
Safety
and bottom of door must not exceed 6 mm (1/4")
Reversing Sensor
• Must have minimum of 203mm (8") between the
side wall (or obstruction) and the end of torsion
bar.
• The torsion bar must extend at least 25mm to
100mm (1" to 4") past the bearing plate.
• An electric outlet is required within 1.8m (6') of
the installation area. If outlet does not exist,
contact a qualified electrician.
• Depending upon building's construction,
extension brackets or wood blocks may be
needed to install safety reversing sensors.
• A model CM475 EverCharge
Unit (SPU) is strongly recommended if there is
no access door to the building, as this opener
cannot be used in conjunction with an external
emergency release mechanism.
• Any gap between the floor and the bottom of the
door must not exceed 6mm (1/4"). Otherwise
the safety reversal system may not work
properly.
NOTE: Inspect the torsion bar while the door is raised
and lowered. It is important that there is no noticeable
movement up and down or left and right. If this type of
movement is not corrected, life of this opener will be
greatly reduced.
Torsion Spring
Drum
Access Door
Safety
Reversing
Sensor
5
Standby Power
TM
Wireless wall button