Magnetic Door Holders
Manual
For use with door closers to control the
release and closing of residential,
commercial, and public area doors
Adjustable armature plate reduces
installation time and adjusts to door
alignment changes
Surface-mount or flush-mount
models available
Fail-safe operation
Low profile design
Holding force – 33-lb (15kg)
3 voltages: 12/24 VAC/VDC, and 120VAC
Cast aluminum faceplate
No residual magnetism for easy release
Built-in voltage spike suppressor
Optional extension bars available:
1
/2", 3/4",
1", 2", 3", 4", 5", 6", 7"
Use with SECO-LARM door closers
SD-C121-S, SD-131-SQ, SD-C101-SGQ,
SD-C101-SBAQ, or SD-C101-SBBQ
Features:
DH-151SQ
Surface-mount
DH-171SQ
Flush-mount
DH-151SQ
DH-171SQ
SECO-LARM Magnetic Door Holders
Introduction:
The SECO-LARM Magnetic Door Holders are designed for virtually any remote door release
applications. The UL Listed SECO-LARM Magnetic Door Holders, used in conjunction with
UL Listed SECO-LARM door closers, control the release and closing of residential, commercial,
and public area doors including apartments, schools, hotels, hospitals, and offices. Fail-safe
operation, tri-volt coils, and adjustable armature plate allows for easy and flexible installation.
SECO-LARM Magnetic Door Holders also come in surface-mount or flush-mount models with full
mounting hardware included.
Model
DH-151SQ
DH-171SQ
Installation
Surface-mount
Flush-mount
Current draw
52mA@12VAC, 60mA@12VDC
27mA@24VAC, 31m@24VDC
24mA@120VAC
Holding force
33-lb (15kg)
Magnet box dimensions
23/4"49/16"x3"
(70x116.5x76 mm)
23/4"x49/16"x21/16"
(70x116.5x52 mm)
Door armature dimensions
29/16"x29/16"x 19/16" (65x65x40 mm)
Magnet box weight
1-lb 6.4-oz (920g)
1-lb 1.5-oz (468g)
Door armature weight
8.1-oz (230g)
Operating voltage
12 VAC/VDC, 24 VAC/VDC, 120VAC
Specifications:
Parts List:
1x Door holder
1x Armature plate
1x Back box (DH-151SQ only)
1x Manual
2x Jumper
2x #10*1
1
/
4
" Wood screws
4x 4*8 Machine screws
2x 3*10 Machine screws
2x 5*15 Machine screws
Wiring Diagram:
For 12VAC/VDC
For 24VAC/VDC
For 120VAC
Voltage
Selector
Jumper
( - ) ( + )
( - ) ( + )
( - ) ( + )
COM 12V 24V 120V
COM 12V 24V 120V
COM 12V 24V 120V
Available Accessories: Extension Bars
DH-100E-05SQ
1
/2" (13mm)
DH-100E-20SQ
2" (50mm)
DH-100E-50SQ
5" (127mm)
DH-100E-07SQ
3
/4" (19mm)
DH-100E-30SQ
3" (76mm)
DH-100E-60SQ
6" (152mm)
DH-100E-10SQ
1" (25mm)
DH-100E-40SQ
4" (102mm)
DH-100E-70SQ
7" (178mm)
2 SECO-LARM U.S.A., Inc.
Installation:
Voltage Settings:
Set the voltage using the jumpers as in the diagram.
NOTE: Factory default is 120VAC. To avoid personal injury or damage to the product, ensure that
the jumper setting matches the wiring connections (See “Wiring Diagram:” on page 2) and the
supplied voltage. Improper settings/wiring will void the warranty and SECO-LARM will not be
responsible for any resulting injury.
Voltage Selector Jumper
Wiring Terminals:
(See "Wiring Diagram:" Pg. 2)
1. Determine mounting location of both the Magnetic Door Holder and the Armature Plate. Run
the power wires to that location in compliance with any local codes.
2. Select the voltage (two jumpers for 12VAC/VDC, or a single jumper for 24VAC/VDC or
120VAC) for the Door Holder (See "Voltage Settings:" below) and adjust the jumpers.
3. For the DH-151SQ (Surface-Mount Magnetic Door Holder):
a. Mount the back box to the location where your wires are run and connect the wires
according to the wiring diagram on page 2.*
b. Finish screwing down the unit to the back box and test the unit.
4. For the DH-171SQ (Flush-Mount Magnetic Door Holder):
a. Connect the wires according to the wiring
diagram on page 2.*
b. Finish screwing down the unit to the single-
gang box and test the unit.
5. Mount the Armature Plate to the door and make
sure it lines up with the door holder (Extensions
available if needed, See pg. 2).
6. Double check all connections and mountings to
make sure the installation is complete.
*IMPORTANT: The wiring connections must match the
voltage jumper settings and the supplied voltage.
Door Holder
Door Armature
12 VAC/VDC
24 VAC/VDC
120VAC
SECO-LARM Magnetic Door Holders
SECO-LARM U.S.A., Inc. 3
SECO-LARM Magnetic Door Holders
DH-151SQ:
Dimensions:
NOTICE: The SECO-LARM policy is one of continual development and improvement. For that reason, SECO-LARM
reserves the right to change specifications without notice. SECO-LARM is not responsible for misprints. Trademarks are the
property of SECO-LARM U.S.A., Inc. or their respective owners.
Copyright © 2017 SECO-LARM U.S.A., Inc. All rights reserved. This material may not be reproduced or copied, in whole or
in part, without the written permission of SECO-LARM.
LIMITED WARRANTY: This SECO-LARM product is warranted against defects in material and workmanship while
used in normal service for two (2) years from the date of sale to the original customer. SECO-LARM’s obligation is limited to
the repair or replacement of any defective part if the unit is returned, transportation prepaid, to SECO-LARM. This Warranty
is void if damage is caused by or attributed to acts of God, physical or electrical misuse or abuse, neglect, repair or
alteration, improper or abnormal usage, or faulty installation, or if for any other reason SECO-LARM determines that such
equipment is not operating properly as a result of causes other than defects in material and workmanship. The sole
obligation of SECO-LARM and the purchaser’s exclusive remedy, shall be limited to the replacement or repair only, at
SECO-LARM’s option. In no event shall SECO-LARM be liable for any special, collateral, incidental, or consequential
personal or property damage of any kind to the purchaser or anyone else.
SECO-LARM
®
U.S.A., Inc.
16842 Millikan Avenue, Irvine, CA, 92606
Website: www.seco-larm.com
PITVW2
Phone: (949) 261-2999 | (800) 662-0800
Email: sales@seco-larm.com
MI_DH-1x1SQ_170131.docx
Armature:
Front
29/16"
(65mm)
29/16"
(65mm)
Side
19/16"
(40mm)
Door Installation
19/16"
(40mm)
13/4"
(44mm)
29/16"
(65mm)
Magnet:
1"
(26mm)
DH-171SQ:
Back
11/16"
(26mm)
Side
21/16"
(52mm)
Front
45/8"
(116.5mm)
23/4"
(70mm)
Side
3"
(76mm)
33/8"
(85mm)
13/4"
(45mm)
2"
(51mm)
4 SECO-LARM U.S.A., Inc.
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