SECO-LARM DH-151SQ User manual

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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
2SECO-LARM U.S.A., Inc.
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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 Manual
2x Jumpers 2x 5*15 Machine screws 2x #10*11/4" Wood screws
4x 4*8 Machine screws 2x 3*10 Machine screws 1x Back box*
1x 1" Extension bar 1x Extension bar wrench
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)
* DH-151SQ only

SECO-LARM Magnetic Door Holders
SECO-LARM U.S.A., Inc. 3
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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.
Volta
g
e 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
4SECO-LARM U.S.A., Inc.
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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 also not responsible for misprints. All trademarks
are the property of SECO-LARM U.S.A., Inc. or their respective owners. Copyright © 2018 SECO-LARM U.S.A., Inc.
A
ll
rights reserved.
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 o
r
alteration, improper or abnormal usage, or faulty installation, or if for any other reason SECO-L
A
RM 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: [phone] | [phone] Email: [e-mail]
MI_DH-1x1SQ_171229.docx
Armature: 
Front
2
9
/
16
"
(
65mm
)
2
9
/
16
"
(
65mm
)
Side
1
9
/
16
"
(40mm)
Door Installation
1
9
/
16
"
(40mm)
1
3
/
4
"
(44mm)
2
9
/
16
"
(65mm)
Magnet: 
1"
(26mm)
DH-171SQ: 
Back
1
1
/
16
"
(26mm)
Side
2
1
/
16
"
(52mm)
Front
4
5
/
8
"
(116.5mm)
2
3
/
4
"
(70mm)
Side
3"
(76mm)
3
3
/
8
"
(85mm)
1
3
/
4
"
(45mm)
2"
(51mm)