D E S K - S E T - I N T E R C O M S

INSTALLATION AND SERVICE INSTRUCTIONS FOR

MODELS

AD-26T, AD-27T, AD-56T, and AD-57T

Address all communications and shipments to:

Electrical Products Division2645 Federal Signal DriveUniversity Park, IL 60466-3195

(888) 751-1500

INSTALLATION-AND-SERVICE-INSTRUCTIONS-FOR-ATKINSON-DYNAMICS-DESK-SET-INTERCOMS

SAFETY MESSAGE TO INSTALLERS,USERS, AND MAINTENANCE PERSONNEL

It is important to follow all instructions shipped with this product.This device is intended to be installed by a trained electrician who isthoroughly familiar with the National Electrical Code and will follow

NEC Guidelines as well as local codes.

The selection of the mounting location for the device, its controls, and therouting of the wiring are to be accomplished under the direction of thefacilities engineers and the safety engineer. In addition, listed below aresome other important safety instructions and precautions you shouldfollow:

• This is not a listed safety device and is not intended to be used assuch.

• Read and understand all instructions before installing or operating thisequipment.

• Disconnect power before connecting or doing any maintenance onthis intercom.

• All effective warning speakers produce loud sounds which may cause,in certain situations, permanent hearing loss. You should take appro-priate precautions, such as wearing hearing protection.

• After testing is complete, provide a copy of this instruction sheet to alloperating personnel.

• Establish a procedure to routinely check the intercom installation forintegrity and proper operation. Any maintenance must be performedby a trained electrician in accordance with NEC guidelines and localcodes.

Failure to follow all safety precautions and instructions may result inproperty damage, serious injury, or death to you or others.

A. GENERAL FEATURES.

The Atkinson Dynamics “T” model is a telephone style intercom withhandset that may be used as a desk set or as a wall mounted unit. Everymodel has an internal loud speaker with volume control which is alwaysmuted during the transmit function to prevent acoustical feedback. Thehandset on each desk set intercom is equipped with a microphone andsoft touch PTT (press-to-talk) button. A red LED on the front panel lights

-1-

up when the PTT button is pressed. An externally accessible volumecontrol for the handset earpiece is factory mounted on the back of thecase for easy operation. Nominal operating voltages for the desk setintercom include 12VDC, 24VDC, 120VAC, and 240VAC. The desk setintercoms are fully compatible with the Atkinson Dynamics wall mountmodels.

MODEL: AD-26T AD-56T AD-27T AD-57T

Supply Voltage 12 VDC 24VDC 120VAC, 240VAC,

50/60 Hz 50/60 Hz

Audio Power

Output (Max.) 1 Watt 1.4 Watts 1.4 Watts 1.3 Watts

Power

Consumption (Max.) 1.6 Watts 4.8 Watts 5 Watts 5 Watts

Operating Current

(Nominal) 130 mA 198 mA 42 mA 21 mA

Operating

Temperature -22° F to +167° F (-30° C to +75° C)

Shipping

Weight 4lb. 5oz. 4lb. 6.6oz. 4lb. 15oz. 4lb. 15oz.

Dimensions See Figure 1

Table 1

ADDITIONAL MODEL INFORMATION

Basic Options Function / Feature:

“C” Master unit

Enhanced Options

“-6” Separate talk and listen lines for selective switching

“-M22” Remote “monitor” on/off toggle switch

Table 2

MASTER UNITS:

“C” Models default to Master, or speaker mode. In Master mode, theunit broadcasts audio signals generated elsewhere in the intercomsystem. With the handset in the cradle, audio is broadcast through a

-2-

speaker mounted on the front panel of the desk set. Depressing thePTT (press-to-talk) button on the handset while speaking into thehandset microphone enables the user to broadcast to all other inter-coms in the system. Releasing the PTT button returns the unit toMaster mode. Figure 3 illustrates a Master/Slave intercom system.

SELECTIVE SWITCHING:

“-6” Models are equipped with separate talk and listen lines for selec-tive switching in a Master/Remote intercom system. A Master intercomcan select to talk to any one or more remotes through the use of acustomer supplied switch box. Figure 4 illustrates a Master/Remoteintercom system using a customer supplied switch box and toggleswitch.

REMOTE MONITOR SWITCH:

“-M22” Models are Master units equipped with a monitor on/off toggleswitch. Figure 5 illustrates an intercom system utilizing this model.When the monitor switch is “on,” it allows the remote intercom to serveas a “hands-free” microphone with transmission to the Master. Whenthe monitor switch is “off,” the remote intercom must press its talkswitch to broadcast to the Master. The remote unit will act as aspeaker and broadcast audio only when the PTT button on the Masteris depressed.

SURGE PROTECTION:

Metal Oxide Varistor (MOV) devices are used to protect the audio lines.The intercom must have Earth or Chassis Ground terminated to it toensure surge protection.

B. UNPACKING.

After unpacking the Atkinson Dynamics desk set intercom, examine it fordamage that may have occurred in transit. If the equipment has beendamaged, do not attempt to install or operate it, and file a claim immedi-ately with the carrier stating the extent of the damage. Carefully check allenvelopes, shipping labels and tags before removing or destroying them.

Before attempting to install the intercom, be sure that all parts listed inthe KIT CONTENTS LIST have been supplied.

-3-

C. KIT CONTENTS LIST.

Qty. Description Part Number

1 Instruction Manual 2561571B

D. MOUNTING.

CAUTION

The selection of the mounting location for the device, its controls, and therouting of the wiring are to be accomplished under the direction of the

facilities and the safety engineer.

The desk set console may be placed anywhere on a flat surface withinsix (6) feet of a power source. It may also be reconfigured to hang on awall or vertical surface. For wall mounting, remove the four (4) screwsfrom the corners which fasten the front PVC panel holder to the back ofthe case. Carefully lift the front PVC panel holder and rotate it 180degrees, watching so that the cables inside fit correctly. Reattach thepanel with the same screws so that when the unit is secured to the wall,the faceplate will slope outward at the bottom and the handset will be tothe left side on the front of the enclosure. Hardware for mounting theintercom to a surface is left up to the installer. Wherever the desk setintercom is mounted, it must be protected from rain or other waterpenetration that could cause severe damage to the internal circuits.Refer to figures 1 and 6 for dimensions of the desk set intercom andmounting hole locations (wall mount applications), respectively.

E. ELECTRICAL CONNECTIONS.

Plug each desk set intercom into a nearby power source. Connect theaudio inputs in parallel. Audio wires should be sized properly by alicensed installation electrician for your specified application. Refer tofigures 2 through 5 for typical connections and additional wiring informa-tion.

-4-

F. SERVICE.

1. GENERAL.

Federal Signal will service your equipment or provide technical assis-tance with any problems that cannot be handled locally.

Any units returned to Atkinson Dynamics for service, inspection, or repairmust be accompanied by a Return Material Authorization. This R.M.A.can be obtained only from the factory by calling (888) 751-1500. At thistime a brief explanation of the service requested, or the nature of themalfunction, should be given.

Address all communications and shipments to:

ATKINSON DYNAMICS

Service Department

2645 Federal Signal Drive

University Park, IL 60466-3195

2. REPLACEMENT PARTS.

DESCRIPTION PART NUMBER

Fuse, 1A (12/24VDC Models) K148A155A-01

Fuse, 1/2A (120/240VAC Models) K148A155A

Handset Assy., Black K8590283A

PCBA for Models:

AD-27T K2001910A

AD-26T K2001910A-02

AD-57T K2001910A-01

AD-56T K2001910A-03

AD-27T-6 K2001910A-6

AD-57T-6 K2001910A-01-6

AD-26T-6 K2001910A-02-6

AD-27CT K2001910A-CT

AD-26CT K2001910A-02-CT

AD-27CT-M22 K2001910A-CT-M22

-5-

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INC

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E:

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mon

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“O

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Mas

ter

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ally

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t pr

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sw

itch

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aste

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NO

TE

S:

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esk

Set

spe

aker

(m

icro

phon

e is

mou

nted

on

hand

set)

2.D

esk

Set

spe

aker

vol

ume

cont

rol

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ands

et e

arpi

ece

volu

me

cont

rol (

mou

nted

on

back

of

case

)4.

Spe

aker

/Mic

roph

one

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peak

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e co

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Talk

sw

itch

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r on

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h8.

Use

shi

elde

d ca

ble

in e

lect

rical

ly n

oisy

are

a. G

roun

don

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d of

shi

eld.

Do

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onne

ct s

hiel

d to

cha

ssis

of

AC

-pow

ered

inte

rcom

.

Pow

erM

aste

rS

lave

120V

50/

60H

zA

D-2

7CT-

M22

AD

-27-

2W3

5

-10-

290A3972-06

1

WALL-MOUNTING-CONFIGURATION

NOTES:

1. Two mounting slots provided for surface mount installations:slot will accept a #10 screw (supplied by installer)

6

2561571BREV. B 202Printed in U.S.A.