Securitron MKSA2, MKSA, MKS2, MKS, MKPZ Installation Instructions

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SECURITRON MK SERIES MORTISE KEYSWITCH PANELS

INSTALLATION AND OPERATION INSTRUCTIONS

1. DESCRIPTION
The MK series Mortise Keyswitch Panel permits use of any standard US 1-1/4" or 1-1/8"

mortise cylinder to operate a switch. A 1 1/2" cylinder can be used if a spacer ring is added to

make it protrude 1/4" from the rear of the face plate. The MK can be used for electric lock
control, alarm panel arming and similar requirements. The assembly supplied includes a face
plate with mounted bicolor LED, bracketry and one or two switches. The user must supply the
cylinder and cam as this is typically incorporated into a master key system.

The part numbering for the series works as follows: MK denotes a b rushed stainle ss steel single
gang outlet box cover mount and MKN denotes a stainless steel 1-3/4" narrow st yle plate. The
unit is delivered standard with a spring loaded momentary SPDT switch. The addition of the
suffix "A" denotes an alternate action switch.

A second switch ordered separately can be affixed to the unit so that turning the key left will
depress one switch and turning it to the right will d epress the other. Momentary and alternate
switches may be combined on the same unit. To order extra switches, the Securitron part
number for a momentary switch is MKS. For an alternate switch, (push on, push off), the part
number is MKSA. The addition of the suffix, "2" denotes a DPDT switch (MK2, MK2SA etc).

2. ASSEMBLY AND PHYSICAL INSTALLATION

Once you have the cylinder you plan to use, note that it has a cam which is turned by the key.
Numerous cams are supplied by various cylinder manufacturers but they come in two main
types: bat and cloverleaf. The MK series is designed to work with any cam which simplifies
installation. It is however necessary for the switch to be mounted in the back bracket by the
installer at an appropriate position to suit the cam. This is why the unit is delivered with the
switch unmounted.

You must therefore start by assembling the unit including the face plate, cylinder, back bracket
and switch and make sure that the cam operates the switch reliably befo re mounting the un it on
the wall. Referring to the drawing, note that the switch can b e mounted on the right or the left
hole in the back bracket. This will result in operation by turni ng the key to the right or the left
respectively. Bat type cams are generally preferred. The switch height in the mounting

hole should be set so that the cam makes reliable contact with the switch and fully
depresses it. Experimentation will show you the correct position. With a cloverleaf cam, the

cam's shoulder can operate the switch wh en it's mounted in the left or right hole. With some
cloverleaf cams, the switch can be mounted in the center hole with operation being obtained
when the key is turned to either the right or left. After you are satisfied, freeze the position of
the switch with the included hardware being sure to use the lock washer.

Note that when you install the brass ring-nut to hold the cylinder in position within the back
bracket, u se the supplied threadlock in the capsule on the brass ring-nut threads. This
will prevent the assembly from loosening up over time. The complete assembly may then be
attached to the wall or back box utilizing the #6 Spanner or standard screws furnished.

Note that for use on drywall, the single gang versions of the MK come with a black plastic
mounting frame. This clamps itself to the drywall and then allows you to screw the MK’s sin gle
gang plate to it. To install the mounting frame, you must prepare a rectangular cut-out in the
drywall using a drywall saw. To mark for sawing, the mounting frame acts as its own template.
Hold the frame against the wall and trace around the inside with a pencil. The rectangle you
mark out will be smaller in size than the cut-out you will require because of the thickness of the

© Copyright, 2011, all rights reserved PN# 500-11700
Page 1 Rev. D, 11/11

lip of the mounting frame which extends into the drywall. To co mpensate for this, simply cut
along the outside of the marked rectangle as the thickness of the drywall saw blade is about the
same as the thickness of the mounting frame lip. See Figure 1 below.

FIG. 1: INSTALLING THE DRYWALL MOUNTING FRAME

TO MARK FOR CUTTING, LAY THE MOUNTING FRAME AGAINST

THE DRYWALL AND TRACE AROUND THE INSIDE WITH A

PENCIL. THEN, USE YOUR DRYWALL SAW ON THE

OUTSIDE

OF

THE LINE TO COMPENSATE FOR THE THICKNESS OF THE LIP.

3. ELECTRICAL CONNECTIONS

The switch will have color coded wires soldered to it as follows: White = Common; Red =
Normally Closed; Blue = Normally Open. The bicolor LED (Securitron part number 030-12500)
can illuminate red or green and has 3 wires attached to it: Red, Green and Black. Black is
common DC negative. Red is the +VDC input to illuminate red. Green is the +VDC input to
illuminate green. Note that the black wire has 2 resistors on it. If the resistors are left as

they are, the LED will operate on 24 volts. For 12 volt operation, remove the outer
resistor. With this set up, you can use either color for your indicator or even alternate red and

green to show 2 different conditions. The LED's could be operated, for instance, from an SPDT
switch to change colors. You cannot, however, drive both sides of the LED at the same
time (the indicator would show orange) or the resistors will be overloaded. If you need to be
able to drive both colors at the same time to display a third (orange) condition, remove both
resistors on the black wire and connect individual resistors on the red and green wires. The
values would be: 620 Ohms 1/2 watt for 12 volts and 1300 Ohms 1 watt for 24 volts.

If you have alternate and momentary switches supplied, they are identified by the numbers
stamped on the switch body:

(MK) Momentary = 8Y1021 or 106F
(MK2) Momentary = 8Y2021 or 206R
(MKA) Alternate = 8Y1011 or 106D
(MKA2) Alternate = 8Y2011 or 206N
The switch contacts will handle up to 3 amps of cu rrent. Note finally that the switch actuator

has a black nylon cover on it. If the cover wears away, the assembly will stil l function as the
switch actuator is steel under the cover.

PN# 500-11700

Page 2 Rev. D, 11/11