Larco Guardian II User Manual

Access Controller

Installation Manual

P/N: 223-0093-000, Rev. F

210 NE 10th Avenue • Brainerd, MN 56401
Phone: [phone] • 800-523-6996
Fax: [phone]

Access Controller

Installation Guide

Table of Contents

Guardian II controllers ............................................................................................................................... 3

Pre-installation of controllers ................................................................................................................... 4

Required power for controllers ................................................................................................................. 4

New installations ....................................................................................................................................... 4

Previously installed electric strikes ........................................................................................................... 4

Diode protection for new or replacement installations ............................................................................ 5

Mode selection and installation of the electric strike ............................................................................... 5

Mechanical installation of the electric strike ............................................................................................ 6

Wiring the controller ................................................................................................................................. 6

Use of externally supplied power for electric strike or magnetic latch .................................................... 6

Enclosures and mounting plate templates ................................................................................................. 7

Startup ....................................................................................................................................................... 7

Wiring diagrams ........................................................................................................................................ 8

Enclosure mounting templates ................................................................................................................ 11

Controller Board ..................................................................................................................................... 14

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Guardian II controllers

G50 (607-0071-000A) - Open Construction:
The open construction Guardian II board mounts directly on top of a Guardian II receptacle. The
receptacle typically mounts in a customer’s enclosure or faceplate. A 1" square hole must be cut in the
panel to insert the receptacle. After the receptacle has been installed, the Guardian II PCB with its
female header is lowered onto the male pins of the receptacle PCB and secured with a nylon tie strap.
A tri-color LED (mounts in a 5/16” diameter hole) and wiring harness are included. This model can be
easily integrated into existing faceplates and enclosures.

G150 (607-0072-000A) - Doorframe Mounting Plate (Stainless Steel):
The controller and tri-color LED are mounted on a 5-1/4" x 1-3/4" stainless steel faceplate that can be
installed on a standard 2” exterior doorframe. A 4-1/4" x 1-1/2" rectangular hole and two #8-32
tapped holes must be drilled to fasten the plate to the frame using the security screws provided.

See Figure 3 for template

G250 (607-0073-000A) - One Gang Remodel Box Assembly
This model is used in interior applications such as lobbies, computer rooms, storage areas, etc. This
single gang remodel box mounts thru a cutout in drywall. The box has two mounting ears that allow it
to be self-securing within the wall. Wall thicknesses of ¼” to 1-1/4” can be accommodated. The
controller and tri-color LED are mounted to a stainless steel faceplate designed to fit the single gang
box.
See Figure 4a for template

G250 (607-0073-002A) - One Gang Outlet Box Assembly
This model can be surface mounted in interior or exterior applications. The enclosure combines
weatherproof cast aluminum, 3 hole (½”) box with an extension ring assembly. The controller and tri­color LED are mounted to the same stainless steel faceplate as the other G250 model. Approximate
dimensions are: 4-3/4”h x 3”w x 3-1/4”d.

See Figure 4b for dimension drawing

G450 - Ruggedized Aluminum Enclosure:
Used where harsh outdoor conditions exist. The controller and tri-color LED are mounted in a 4-7/8" x
3-1/8" x 2-1/4" aluminum enclosure which can be mounted directly on a surface (wall) or to the back
(secured side) of the optional, 11 gauge mounting plate with (2) security screws. The plates come in
stainless steel or aluminum and are typically welded in place.

The optional installation kit, 702-0071-000A contains (2) tamper-resistant ¼-20 x 2-1/2” screws and (1)
1/4" drive spanner bit. Both the plates and installation kit can be purchased separately.

See Figure 5 for template

Installation Guide

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Installation Guide

Pre-installation of controllers

Physical installation of the Guardian II controller can vary from site to site. The templates supplied in this guide
are drawn full size to help you with the physical layout and installation of your new controllers.

Our controllers are truly "stand alone" devices. This means that once you supply power to the controller and
connect device (electronic strike, magnetic lock) wires, your system is ready to start up. The Guardian II controller
requires no wiring back to a central computer. All data is transferred between controllers and your PC computer,
via our rugged Admin and Export keys. It is good practice to mount your controller as close to the door strike as
possible, to minimize the wiring distance between the two devices.

Required power for controllers

Power required for the Guardian II controller is 9-12 VAC or VDC (0.3A). The maximum input voltage to the
controller is 12V. Important: For AC supplies, a voltmeter should be used to verify that the input voltage

DOES NOT exceed 12V

New installations

RMS.

Wiring diagrams for the Power Fail Lock and the Power Fail Unlock strike installations can be found on pages 8 &

9. The wires in the controller harness are color-coded. A 12 VDC electric strike (308-0045-000), available from
Larco, can be configured as a Power Fail Lock or Power Fail Unlock simply by re-positioning the two screws on the
side of the assembly. (Refer to Figures 1 & 2).

NOTE: The electric strike, as it is shipped from Larco (sold separately), will typically be set to "Power Fail Secure
(lock)" by the factory. Before installation of the strike, check to make sure that the strike is set to the mode you
require.

Figure 1 Figure 2

Fail Secure (Lock) Fail Safe (Unlock)

A diode is integrated on-board the Guardian II printed circuit board to protect its relay. Refer to the wiring

diagrams on pages 8 & 9 for proper wiring.

Previously installed electric strikes

The Guardian II controller operates (1) Form C, SPDT 2A@30VDC relay contact that acts as a switch for electric
strike or other device. If you have an electric strike installed, check to make sure that it does not exceed a
maximum current draw of 2 Amps @ 30 VDC resistive load.

If you are using a magnetic latch, check the voltage requirement and make sure that the current draw does not
exceed 2 amps. Some magnetic latches require a high voltage to operate. A separate power supply must be used
to power the magnetic latch only. In that case, refer to the wiring diagrams on page 9.

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Installation Guide

When a key is authorized to activate the controller, the strike releases a solenoid in the assembly and allows the
strike latch to open. This means that the latch bolt in the lockset is not withdrawn into the door, as would
normally be the case by operating the handle. Clearance must be provided for the bolt to travel beyond the
confines of the strike. Without this clearance, the strike will release the bolt. However, the gate will not open
due to the interference between the frame where the strike is installed and the bolt in the lockset.

NOTE: For either installation, Power Fail Lock or Power Fail Unlock, ALWAYS make the power connections last.
For DC strikes, make sure the diode (White/Red & White/Black wires) are connected according to the correct
wiring diagram on pages 8 -10. Connecting this diode backwards can possibly damage the Guardian II controller.

If you are providing your own strike, a diode may already be installed. If so, check to make sure that the cathode
(the end with the band) is connected correctly.

If, for any reason, the Guardian II controller has to be removed, disconnect power to the controller, prior to
disconnecting any other wires.

Diode protection for new or replacement installations

If this is a new installation and the electric strike has been purchased from Larco, the strike should be installed as
shown in the appropriate diagram for your application (reference wiring diagrams). If you are replacing an existing
unit and a strike is already installed, it is very important to check the rating of the strike and that it matches the 12
VDC at 2 amps or less. If this is not the case, a separate power supply will have to be provided and connections
made according to the applicable drawing. You will also need to check if the currently installed strike already has a
diode installed. If it does, make sure that polarity is observed. If a diode was not installed, wire to terminals 15
and 16 (for DC applications only). The installation of this diode is not mandatory; however, it is highly
recommended to reduce any inductive kickback generated by the strike and preserve the relay’s contact life.

CAUTION: If an AC strike or magnetic latch is installed,

DO NOT connect to the White/Red or White/Black wire) wires.

Mode selection and installation of the electric strike

Selecting Power Fail-Secure or Power Fail-Safe

Prior to mechanical installation of the strike, you must first determine which configuration of the strike is correct
for your application. With the electric strike supplied by Larco, there are two possible options:

1. Power Fail-Secure: Should a power failure occur the strike would revert to a LOCKED condition. This is

commonly referred to as “Power Fail Secure” and also “Power Fail Lock". The secured area typically has a means

of allowing personnel to exit the area if a power failure occurs. This configuration is typical for any area that must
remain secured if power fails. (Fig. 1)

2. Power Fail-Safe: Should a power failure occur the strike would revert to an UNLOCKED condition. This is
commonly referred to as "Power Fail Safe" or “Power Fail Unlock”. This configuration is not typically used where a

secured area may be compromised. (Fig. 2) If you are using a strike that is already installed or if you plan to

supply the electric strike, verify that it is compatible with the electrical requirements for Guardian II controller and
that it will function properly for your application.

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