Securitron MUNL-24 - Manual (Page 3)

PN# 500-18800
Page 3 Rev. E, 11/11
2.4.1 EXCEPTIONS:
When working with Corbin Russwin ML2000 and BEST Series 2 Mortise Locks the dead latch
needs to be removed. With both of these locks the dead latch is not retracted by the lever set
when you are exiting the secure area this means that depending on the door gap the dead latch
may hang up on the stainless steel case of the MUNL.
2.4.2 DETERMINING SPRINGLATCH PLUNGER LOCATION
The goal of this determination is to vertically align the Mortise UnLatch’s springlatch
plunger with the lock’s springlatch. The deadlatch pin will then be “automatically” operated
by the deadlatch fingers regardless of its position on the lock. It’s important, however, to
determine the position in such a way that maximum tolerance is achieved in the event that the
door shifts against the frame.
To begin, loosely mount the Mortise Unlatch and close the door so that you can see the top and
bottom of the lock’s springlatch. Draw lines on the lip of the Mortise UnLatch’s strike which
correspond to the lock’s springlatch position. Next dismount the Mortise UnLatch. The drawn
lines and knowledge of the gap between the springlatch and deadlatch pin are used to determine
the vertical position of the springlatch plunger. When this gap is greater than ¼”, best
reliability is obtained when the springlatch plunger position is centered on the springlatch.
When the gap is smaller than ¼”, however, simply centering the springlatch plunger risks
positioning the deadlatch pin too close to the springlatch plunger so the procedure is to position
the edge of the springlatch plunger midway between the springlatch and deadlatch pin. Figure 2
illustrates these points.
FIG. 2: DETERMINING POSITION OF SPRINGLATCH PLUNGER
2.4.3 ADJUSTING SPRINGLATCH POSITION
Now that you have marked the unit with the correct position for the springlatch plunger, the
actual adjustment must be performed. Figure 3 shows the procedure.
GAP BETWEEN
DOOR AND FRAME
CURVED LIP OF
MORTISE UNLATCH
SPRINGLATCH
DRAW LINES ON MORTISE
UNLATCH DENOTING TOP
AND BOTTOM OF SPRINGLATCH
DEADLATCH PIN
(MAY BE ABOVE)
MEASURE GAP
BETWEEN
SPRINGLATCH AND
DEADLATCH PIN
EXAMPLE OF SPRINGLATCH
PLUNGER CENTERED WITH
RESPECT TO SPRINGLATCH
POSITION (SHOWN BY
DRAWN LINES). THE PLUNGER
SHOULD BE CENTERED WHEN
THE GAP BETWEEN THE
SPRINGLATCH AND DEADLATCH
PIN IS GREATER THAN 1/4"
WHEN THE GAP BETWEEN THE SPRINGLATCH AND DEADLATCH PIN
IS LESS THAN 1/4", SET THE BOTTOM EDGE OF THE SPRINGLATCH
PLUNGER MIDWAY BETWEEN THE SPRINGLATCH AND DEADLATCH
PIN. (NOTE THAT THE DEADLATCH PIN MAY BE BELOW THE
SPRINGLATCH AS IN THIS EXAMPLE, OR ABOVE IT)
SPRINGLATCH
PLUNGER
SPRINGLATCH BOTTOM EDGE (EXAMPLE)
DEADLATCH PIN TOP EDGE (EXAMPLE)
MIDWAY POSITION
GREATER THAN 1/4" GAP
LESS THAN 1/4" GAP