TESTING THE DOOR
4
Complete the following test to ensure your door is well
balanced, and not sticking or binding:
• Disable all locks and remove any ropes connected to the
door.
• Lift the door to about halfway and then release it. The
door should remain spring balanced.
• Raise and lower the door to determine if there are any
sticking or binding points (20 kgf is the absolute maximum
allowable to raise or lower the door in any position).
• If your door does not hold in place or the door binds, sticks
or requires excessive force to move, call a qualified door
technician before installing the opener.
Non opener side Opener side
• Install the stop collar on the opposite end to where
the opener is to be installed.
• Fit the stop collar hard against the boss of the door
drum. Ensure the U-bolt holding the door shaft to the door
bracket is tightly secured.
INSTALLING THE STOP COLLAR
5
3
SAFETY CHECK!
Is the stop collar
installed?
YES: proceed to the next
step
NO: install the stop collar
before proceeding
PINNING THE DOOR
Note: A ballooning door may delay the safety reversal
response and can compromise door security.
• To remedy any ballooning place self tapping metal screws
or rivets where the curtain leaves the roll. Secure these
through the curtain into the drum wheel at each end of the
roll.
• After determining the correct fastener location as shown, lift
the door approximately half a turn from the closed position
to allow access for drilling.
Free curtain
Ballooning
Add fasteners here
Door closed
Door can be
lifted
Door secure
6
Note: When installed on light commercial doors, the warranty covers the replacement of the opener
only. Merlin holds no responsibility for the door or costs associated with the door in order to access
the opener. For warranty to be claimed in a light commercial application, proof must be provided that
the door has been serviced according the door manufacturers requirements and that the door is
spring balanced, is operable by hand and opens and closes with no more than a maximum of 20 kgs
of lifting weight.
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