Factory Direct Hardware SEM7840 User Manual
1-800-526-2400
28 30 32 34 36 38 40 42 44 46 48
2 26 1/8 28 1/8 30 1/8 32 1/8 34 1/8 36 1/8 38 1/8 40 1/8 42 1/8 44 1/8 46 1/8
4 26 28 30 32 34 36 38 40 42 44 46
6 25 3/4 27 3/4 29 13/16 31 13/16 33 13/16 35 5/8 37 7/8 39 7/8 41 7/8 44 46
8 25 5/16 27 3/8 29 7/16 31 1/2 33 1/2 35 1/2 37 5/8 39 5/8 41 5/8 43 5/8 45 11/16
10 24 3/4 26 13/16 29 31 33 35 1/8 37 3/16 39 1/4 41 1/4 43 5/16 45 3/8
12 24 26 28 1/4 30 3/8 32 1/2 34 9/16 36 11/16 38 3/4 40 13/16 42 7/8 45
14 23 25 3/16 27 3/8 29 5/8 31 3/4 33 15/16 36 38 1/8 40 1/4 42 5/16 44 3/8
16 21 5/8 24 26 3/8 28 5/8 30 7/8 33 35 1/4 37 7/16 39 9/16 41 11/16 43 13/16
18 20 1/8 22 3/4 25 1/8 27 1/2 29 13/16 32 1/8 34 3/8 36 9/16 38 3/4 41 43
20 18 1/4 21 23 11/16 26 3/16 28 5/8 31 33 5/16 35 9/16 37 13/16 40 42 1/4
22 19 22 24 5/8 27 3/16 29 11/16 32 34 7/16 36 3/4 39 41 5/16
24 22 3/4 25 1/2 28 1/8 30 11/16 33 1/8 35 3/16 38 40 1/4
26 26 3/8 29 31 11/16 34 5/8 36 5/8 39
28 30 32 5/8 35 3/16 37 11/16
30 28 30 7/8 33 9/16 36 3/16
32 31 11/16 34 1/2
A = Dimension of door jamb to wall (Inch)
Nearest Whole
Number
B = dimension of door width (Inch)
Magnetic Door Holder Placement Chart
7840/50
DOOR
®
JUNCTION
BOX
WALL LINE
SEM 7840/7850
Sentronic Electro-Magnetic
®
Single Door Holder Concealed Wall Mount
Step 1: Locate the Junction Box (Not Provided)
See Fig. 1. Measure dimensions A and B. Find the intersection of those two dimensions in
A.
Table 1.The intersection is dimension C, the centerline of the surface mount box location.
(For 180° installations, take B dimension and subtract 5 5/8” to find the centerline of junction
box. Note: Optional extensions maybe needed.)
If dimension A or B is not shown on the chart, interpolate to find dimension C as follows.
B.
If dimension A is 11” and dimension B is 36”, then:
dimension C = 33 - ((33 - 32 1/2)/2) = 32 3/4
If dimension A is 12” and dimension B is 35”, then:
dimension C = 32 1/2 - ((32 1/2 - 30 3/8)/2) = 31 7/16
If dimension A or B is beyond those listed in Table 1 or if they intersect in a blank area in
Table 1, use optional extensions as needed to align contact plate and magnet.
See Fig. 2. The center of the junction box should be located about 5” from the top of the
C.
door. Install junction box to withstand at least a 50 pound pull.
Pull wire in accordance with applicable codes, standards, and authorities having jurisdiction.
D.
Electrical specifications are shown below.
CAUTION
!
IMPROPER INSTALLATION MAY
RESULT IN PERSONAL INJURY OR
PROPERTY DAMAGE. FOLLOW ALL
INSTRUCTIONS CAREFULLY. FOR
QUESTIONS, CALL LCN AT
800 - 526 - 2400
DOOR JAMB
Table 1
Input Voltage
120VAC, 60Hz
24VAC, 60Hz/24VDC
12VDC
Current Draw Max.
.02A
.02A
.03A
Fig. 2
2 ½”
64mm
4 5/8”
117mm
Fig. 3
Back view of magnet assembly
2/07 © 2007 SCHLAGE LOCK Company. All rights reserved D.P. # 29352r2
COM
24V
120V
12V
Earth Ground
2 13/16”
70mm
Junction
Box
Step 2: Install the Magnet
A. The magnet is shipped partially assembled for protection. Unscrew the cover from the
magnet bracket assembly. Keep the screws for later reattachment.
B. See Fig. 3. Connect the supply earth ground wire to the green wire on the magnet bracket assembly. 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.
C. See Fig. 2. With the magnet wired, position the magnet bracket assembly into the junction box and attach it
to the box using the (2) 6-32 screws. Tighten firmly. Attach the cover housing using the (2) 10-24 screws from
step 2A.
WALL PORTION
Magnet
Bracket
Assembly
Cover
Fig. 4
Install Armature for 7840
For drill hole template,
remove paper from
the back to reveal
sticky back of template.
Locking
Screw
Install Armature for 7850
For drill hole template,
remove paper from
the back to reveal
sticky back of template.
Locking
Screw
Wood
Screws
7840SEM show, 7850SEM can be mounted in the same fashion.
*
Thru
bolts
Fig. 5
Backup
Plate
Set
Screw
SEM 7840 Armature
Backup
½”
13mm
Plate
WOOD SCREW MOUNTING
FOR SOLID WOOD CORE DOORS
This view shows the contact plate
locking screw accessible from the top.
Rotate backup plate 180° for underside access.
½”
13mm
Backup
Plate
Set
Screw
SEM 7850 Armature
Backup
Plate
Contact Plate
locking screw
1 5/8”
41mm
Contact
Plate
Contact Plate
locking screw
2 5/8”
67mm
Contact
Plate
Fig. 6
Door
Plate
Door
Plate
1 3/4”
44mm
THRU BOLT MOUNTING
HOLLOW METAL, HOLLOW CORE
OR COMPOSITE TYPE WOOD DOORS
Contact Plate
locking screw
SEM 7840 Armature
1 5/8”
41mm
RECOMMENDED FOR
Door
Plate
Door
Plate
Contact
Plate
1 3/4”
44mm
Contact Plate
locking screw
SEM 7850 Armature
2 5/8”
67mm
Contact
Plate
(2) #10 x 1 ½”
Armature
Pull Side
of Door
(2) #10 x 1 ½”
Pull Side
of Door
Armature
(2) 1/4-20 x 2”
Pull Side
of Door
Armature
(2) 1/4-20 x 2”
Armature
Pull Side
of Door
Step 3: Install the Door Armature
A. See Fig. 4. Slightly loosen the contact plate locking screw using a 5/32 Allen wrench so the contact plate can rotate with some
”
resistance. Remove the protective paper from the drill template sticky-back label on the back of the door armature.
B. Place the armature against the floor magnet. This is best done with power applied to the magnet. If power is not available, hold
the armature in place by hand. The armature contact plate must fully cover the magnet. If the contact plate is not centered and
flat on the magnet, reduced holding force will result.
C. With the armature against the magnet, open the door and press it against the armature and magnet. Pull the door away to transfer
the drill template to the door.
Template may need assistance with transferring to door, using a flat blade screwdriver on the
template tab that sticks out and push it onto the door while pulling the door away.
D. See Fig. 5 and 6. Determine if the armature will be mounted using the wood screw kit or the thru bolt kit. The thru bolt kit
is recommended for 1 hollow metal, hollow core, or composite-type wood doors. If using the wood screw kit, drill the center
two holes on the template using a 1/8 bit by 1 deep. If using the thru bolt kit, drill the outer two holes on the template using
a 5/16 bit all the way through the door. Remove the template after the holes are drilled.
”
¾”
” ¼”
E. Attach the armature to the door using the appropriate plate and screws. If using the wood screws and backup plate, tighten the
armature set screw against the backup plate as the last step using the 1/16 Allen wrench provided.
”
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