Becker BOM 520 Betriebsanleitung Seite 21

BOM 520/820 Operating Instructions
9
10
4
max.
45°
12
11
11
a
retention pin retention pin
12
16
9
a
b
pull button pull button
Fig. 9
Determine length of ceiling fixings for drive head and
central suspension, shorten with saw if necessary,
and screw on.
Note:
Before drilling, protect rail and drive
head from drill dust.
Mark fixing points onto ceiling, drill 10mm holes for
dowels, and screw on ceiling fixings.
Fig. 10
If there is any sag in the chain, it may need to be re-
tensioned slightly. If necessary, eliminate the sag-
ging by adjusting the ceiling mountings.
Fig. 11 - Joining the door connection
bracket - running slide block
Place connecting rod (12) between the running slide
block (4) and the door connection bracket (11) and
join at both ends with bolts. Provide bolts with safety
clips.
Fig. 12 - Releasing the running slide
block
To undertake additional work it may be necessary to
release the connection between the door and drive
using the pull button on the running slide block, and
move the door manualy.
Note:
If the door is to be manually operated
for a prolonged period of time, release
the retention pin from the park position
(a) on the left and put it in the stop posi-
tion (b), with the pull button extended.
To relock, return the retention pin to the left park po-
sition (a) and reconnect the door and drive. The run-
ning slide block will automatically re-engage the next
time the door moves.
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