FLOOR PORTION
SEM 7820
Sentronic Electro-Magnetic
Single Door Holder Floor Mounted
®
4 9/16”
116mm
SINGLE DOOR INSTALLATION
CLEARANCE FOR SEM7820
FLOOR PORTION
LOCATION OF
CONDUIT
DOOR PIVOT
POINT
WALL
DOOR WIDTH
(INCHES)
ARC LENGTH
4
6”
1
4
DIA.
®
1-800-526-2400
12/06 © 2006 SCHLAGE LOCK Company. All rights reserved D.P. # 29350
Step 1: Plan the Installation
A. Measure the door width.
B. Calculate the arc length by subtracting 5 5/8 from the door width.
Draw an arc at the calculated length using the door pivot point as
the center point. String and a pencil could be used to draw the arc
on the floor.
C. Open the door to the desired position. On the pull side of the door,
put a mark on the arc 4 from the door. This is the center of the
conduit hole.
D. Drill and install conduit as needed. Maximum conduit size is .
Maximum conduit height above the floor is 1 .
E. Pull wire in accordance with applicable codes, standards, and
authorities having jurisdiction. Electrical specifications are
shown below.
”
¼”
½”
”
Input Voltage Current Draw Max.
120VAC, 60Hz .02A
24VAC, 60Hz/24VDC .02A
12VDC .03A
Step 2: Install the Magnet
A. The magnet is shipped partially assembled for protection. Unscrew the cover from the base, then unscrew the magnet bracket
assembly from the base. Keep the screws for later reattachment.
B. Guide the conduit through the hole in the base and snug up the conduit nut. Square up the base to the door, with the door
opened to the desired position, as shown in Fig.1.
C. See Fig. 2. Using the base as a template, mark the four mounting hole locations on the floor.
D. Remove the base and drill 3/8” holes in the floor at 1 1/4” deep. Install the cement anchors provided into the drilled holes,
threaded ends up.
E. Reposition the base, aligning the mounting holes with the floor holes and the magnet opening facing the door.
Tighten the conduit nut. Install (2) mounting screws that are furthest away from the magnet opening into the cement anchors.
The magnet assembly must first be connected to power supply wires before the other two base housing mounting screws can be
installed.
F. See Fig. 3. Connect the supply earth ground wire to the green wire on the magnet assembly bracket. Connect the power supply
common wire to the screw terminal marked COM. If the supply voltage is 24V, connect the power supply hot wire to the screw
terminal marked 24V. If the supply voltage is 120V, connect the power supply hot wire to the screw terminal marked 120V. If the
supply voltage is 12V, connect the power supply hot wire to the screw terminal marked 12V. Polarity is important on the 12V input.
There are protective plastic tabs over the terminal screws. Break off the two tabs that protect COM and the desired voltage so that
the screw heads are exposed.
G. See Fig. 2. With the magnet wired, position the magnet bracket assembly over the two base mounting holes and the two base
post holes. Insert (2) -20 base mounting screws and the (2) 10-24 shorter screws from step 2A into
the post holes. Tighten firmly. Attach the cover using the (2) 10-24 longer screws from step 2A.
¼-20
into the cement anchors¼
COM
24V
120V
12V
Earth Ground
5
5
8
5”
127mm
2 17/32”
64mm
2 7/8”
73mm
Fig. 1
Fig. 2
Back view of magnet assembly
IMPROPER INSTALLATION MAY
RESULT IN PERSONAL INJURY OR
PROPERTY DAMAGE. FOLLOW ALL
INSTRUCTIONS CAREFULLY. FOR
QUESTIONS, CALL LCN AT
800 - 526 - 2400
CAUTION
!
Fig. 3
MOUNTING
HOLES
CONDUIT
HOLE
Cover
Magnet
Bracket
Assembly
Base
(2 pages)
(9 pages)
(86 pages)
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