Assa Door Lock User Manual
Copyright, 2001, all rights reserved • Securitron Magnalock Corp., 550 Vista Blvd., Sparks NV 89434, USA
Tel: (775) 355-5625
• (800) MAGLOCK • Fax: (775) 355-5636 • Website: www.securitron.com
An ASSA ABLOY Group company
PN# 500-18800
Page 1
Rev. A.1, 8/01
SECURITRON MODEL MUNL-12, MUNL-24 MORTISE UNLATCH
INSTALLATION AND OPERATING INSTRUCTIONS
1. DESCRIPTION
Securitron’s Mortise UnLatch is a revolutionary new type of electric strike which eliminates the
necessity to perform a routing operation on the door frame for installation. The motor
driven Mortise UnLatch also presents a fully concealed appearance on the door which not
only enhances architectural appeal but improves security over a conventional electric strike as
an intruder is less able to determine the type of security device present on the door. The
Mortise UnLatch functions with all North American mortise locks and includes a latch
status output which reports when the door is in latched (secure) condition or is open.
necessity to perform a routing operation on the door frame for installation. The motor
driven Mortise UnLatch also presents a fully concealed appearance on the door which not
only enhances architectural appeal but improves security over a conventional electric strike as
an intruder is less able to determine the type of security device present on the door. The
Mortise UnLatch functions with all North American mortise locks and includes a latch
status output which reports when the door is in latched (secure) condition or is open.
Product Specifications are: Input Voltages: 12 VDC (MUNL-12), +20%, -10%. 24 VDC
(MUNL-24), +20%, -10%. Current: At rest: 40 mA (either voltage). When operating- 4 Amp
input surge @ 12 VDC; 2 Amp input surge @24 VDC for 100 milliseconds and 600 mA @ 12
VDC or 300 mA @ 24 VDC during motor movement. Operating Temperature: -10
(MUNL-24), +20%, -10%. Current: At rest: 40 mA (either voltage). When operating- 4 Amp
input surge @ 12 VDC; 2 Amp input surge @24 VDC for 100 milliseconds and 600 mA @ 12
VDC or 300 mA @ 24 VDC during motor movement. Operating Temperature: -10
° to 125° F.
FIG 1: MORTISE UNLATCH DIMENSIONS (INCHES)
1.25
1.25
1.88
3.50
3.38
RECOMMENDED TOOLS
4.88
SPRINGLATCH
PLUNGER
PLUNGER
DEADLATCH
FINGERS
FINGERS
MEDIUM + SMALL PHILLIPS DRIVER
MEDIUM SLOTTED DRIVER
CHISEL, 5/64 ALLEN WRENCH
WIRE CUTTER/STRIPPER
VOLT/OHM METER
CRIMP CONNECTORS
CRIMP PLIERS
MEDIUM SLOTTED DRIVER
CHISEL, 5/64 ALLEN WRENCH
WIRE CUTTER/STRIPPER
VOLT/OHM METER
CRIMP CONNECTORS
CRIMP PLIERS
2. PHYSICAL INSTALLATION
2.1 SURVEY
The installer must first be sure that the latch is of the mortise type
(see the drawing to the right.) A mortise lock (or latch) includes a
square shaped springlatch and a “pin” called the deadlatch pin or
guard bolt which may be positioned either above or below the
springlatch. Most mortise panic bar latches are also perfectly
compatible with the MUNL. Note, however, that if the mortise lock
assembly includes a dead bolt, the dead bolt will not be operable
The most common alternate type of latch in use in North America is
called cylindrical, tubular or bored. The standard UnLatch (model
numbers UNL-12 and UNL-24) is designed for this alternate type of
latch. Securitron does not offer an UnLatch solution for a rim latch
(rim latches are on the surface of the door rather than being mortised
into the middle of the door).
(see the drawing to the right.) A mortise lock (or latch) includes a
square shaped springlatch and a “pin” called the deadlatch pin or
guard bolt which may be positioned either above or below the
springlatch. Most mortise panic bar latches are also perfectly
compatible with the MUNL. Note, however, that if the mortise lock
assembly includes a dead bolt, the dead bolt will not be operable
The most common alternate type of latch in use in North America is
called cylindrical, tubular or bored. The standard UnLatch (model
numbers UNL-12 and UNL-24) is designed for this alternate type of
latch. Securitron does not offer an UnLatch solution for a rim latch
(rim latches are on the surface of the door rather than being mortised
into the middle of the door).
Deadlatch Pin
Springlatch