Address all communications and shipments to:
2645 Federal Signal Drive
University Park, IL 60466-3195
(888)751-1500
Atkinson Dynamics Intercoms
Models AD-26, AD-27, AD-56, and AD-57
Installation and Service Instructions
INSTALLATION AND SERVICE INSTRUCTIONS FOR ATKINSON DYNAMICS
HEAVY-DUTY INTERCOMS
SAFETY MESSAGE TO INSTALLERS, USERS AND MAINTENANCE PERSONNEL
It is important to follow all instructions shipped with this product. This device is to be installed by a
trained electrician who is thoroughly familiar with the National Electrical Code and will follow NEC
Guidelines as well as local codes. Marine installations shall be in accordance with Title 46, CFR,
Parts 110-113.
The selection of the mounting location for the device, its controls and the routing on the wiring is to
be accomplished under the direction of the facilities engineer and the safety engineer. In addition,
listed below are some other important safety instructions and precautions you should follow:
• This is not a listed safety device and is not intended to be used as such.
• Read and understand all instructions before installing or operating this equipment.
• Disconnect power before connecting or doing any maintenance on this intercom.
• All effective warning speakers produce loud sounds which may cause in certain situations,
permanent hearing loss. You should take appropriate precautions such as wearing hearing
protection.
• After testing is complete, provide a copy of this instruction sheet to all operating personnel.
• Establish a procedure to routinely check the intercom installation for integrity and proper
operation. Any maintenance must be performed by a trained electrician in accordance with NEC
guidelines and local codes.
• This device can be installed in climates with wind blown dust and rain or splashing water. Do not
install this device in climates that exceed the unit's operating temperature range.
Failure to follow all safety precautions and instructions may result in property damage, serious
injury, or death to you or others.
A. General Features.
The Atkinson Dynamics intercom is a heavy-duty, 2-way, communications device designed for
industrial applications. There are four basic models: AD-26, 12VDC; AD-56, 24VDC; AD-27,
120VAC 50/60Hz; and AD-57, 240VAC 50/60Hz. The AC line is fused with a 1/2-amp 250
volt type GMC fuse in the 120/240VAC units. A description of the available models follows.
Basic Model Specifications
Model AD-26 Model AD-56 Model AD-27 Model AD-57
Supply Voltage 12 VDC 24VDC 120VAC, 50/60 Hz 240VAC, 50/60 Hz
Audio Power
Output (Max.) 8.0 Watts 11.7 Watts 11.3 Watts 11.3 Watts
Power Consumption
(Max.) 20.0 Watts 39.6 Watts 28.8 Watts 30.5 Watts
Operating Current
(nominal) 1.47 A 1.65 A 0.240 A 0.127 A
Operating
Temperature -31°F to 150°F -31°F to 150°F -31°F to 150°F -31°F to 150°F
Shipping Weight 10 lbs. 10 lbs. 10 lbs. 11 oz. 10 lbs. 11 oz
Dimensions See Figure 20 See Figure 20 See Figure 20 See Figure 20
Ratings UL, cUL, Marine-Listed, CE (Model AD-27)
NEMA-Type 4X (excluding microphone models), Type IP56 (Model AD-27)
Table 1
-1-
Additional Model Information
Letter Group Function/Feature
“A” Call button
“C” Master mode
“D” Slave mode
Number Group
“-1” Remote power
“-2” Provisions for external talk/listen switch (Foot pedal ready)
“-3” External call contacts for auxiliary signal
“-4” Extreme temperature use (-50°F to 150°F)
“-6” Designed for use in a zoned system
“-7” Provisions for hand-held noise canceling microphone
“-8” Additional pre-amp for use with remote slave speaker
Miscellaneous
“-M22” Equipped with remote monitor switch
“-M34” Provisions for headset microphone with belt switch
“-M44” Remote speaker volume control
Table 2
MASTER UNITS:
“C” Models default to Master, or speaker, mode. In Master mode, the unit acts as a speaker and
broadcasts audio signals generated elsewhere in the intercom system. Depressing the Talk switch
turns the unit into a microphone and enables the user to broadcast to all other intercoms in the
system. Releasing the switch returns the unit to Master mode. Figure 4 illustrates a Master/Slave
intercom system.
SLAVE UNITS:
“D” Models default to Slave, or microphone, mode. In Slave mode, the unit is designed to serve
as a hands-free microphone with transmission to all Master units in the intercom system. The
Slave unit will act as a speaker and broadcast audio transmissions only when the Talk switch of
any Master unit in the intercom system is depressed. Figure 4 illustrates a Master/ Slave intercom
system.
CALL BUTTON:
“A” Models are equipped with a Call switch. Depressing the call switch transmits an 890Hz tone
to all units in the intercom system.
CAUTION
The call signal is louder than normal voice messages being carried on the line. Do not depress the
call switch while carrying on a conversation with someone on the system. This will subject the
listener to very loud sound levels.
The volume of the call signal is affected by the volume control on the receiving unit, so if volume is
turned all the way down at a receiving station, the call signal will not be heard.
MICROPHONE:
“-7” Hand-Held Noise Cancelling Microphones are recommended for use in environments with
high levels of ambient noise. Keying the microphone overrides the default mode of the intercom
and enables audio transmission to all Master units in the intercom system. Figure 2 illustrates a
common intercom system where hand-held microphones are used.
-2-
-3-
HEADSET MICROPHONE WITH-BELT-SWITCH:
“M34” Headset Microphones and Belt Switches are an additional option for environments with a
high level of ambient noise. Keying the belt switch overrides the default mode of the intercom
and enables audio transmission to all Master units in the intercom system. Figure 5 illustrates a
common intercom system where a headset microphone and belt switch are used.
REMOTE POWER:
“-1” Models are designed to provide power to “-1” remote intercom units. The AC-powered main
unit provides 12 Volts DC-power and audio in the same cable to the remote unit. A “-1” unit can
provide power to just one remote unit. Figure 3 illustrates this configuration.
PRE-AMPLIFIER:
“-8” Models are equipped with a pre-amplifier and are designed for use with Slave speaker units
such as the AD-SV-25 Remote Speaker with Volume Control. The “-M44” option equips the “-8”
Master unit with a knob for controlling the volume of remote speakers such as the AD-SF-25
Flush Mount Speaker or the AD-SS-25 Swivel Mount Speaker. Figures 6 and 7 illustrate intercom
systems with the “-8” and “-M44” options.
EXTERNAL-POWER-SOURCE:
The use of an external power source allows the user to configure intercom systems made up of “1” DC-powered Master and Slave units. Figure 8 illustrates such a system.
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 to ensure surge protection.
The output amplifier of the Atkinson Dynamics intercom offers full short circuit protection and
overheat protection on AC models only.
FOOT PEDAL READY:
Models with the “-2” option are designed for hands-free activation of the Talk/Listen switch.
Figures 9, 10, and 17 show examples of intercoms with this option. A heavy-duty foot pedal
(Model ADFP) is available through Atkinson Dynamics.
AUXILIARY SIGNAL:
Models with the “-3” option are equipped with a call button that provides a contact closure for an
attention-getting auxiliary device, e.g. a strobe light. Figure 13 demonstrates an intercom system
with this option. Atkinson Dynamics offers a low profile strobe light that is available with an
amber or red lens, pipe or surface mount configuration, and in three voltage variations.
ZONED SYSTEM REMOTE:
Models with the “-6” option are designed for use in a zoned system. Figure 11 illustrates a zoned
intercom system. A master intercom can select (via a switch box) to talk to any one or more
remotes in a system. Each remote unit is equipped with a Talk/Listen switch that enables
communication to the master intercom, even when that zone is not selected. Atkinson Dynamics
offers 6-zone and 12-zone switch boxes.
MONITOR SWITCH:
Models with the “-M22” option are equipped with a monitor on/off toggle switch. When the
monitor switch is in the on position, the remote unit becomes a slave and defaults to talk mode.
Figures 14 and 15 illustrate systems with this feature.
B. Unpacking.
After unpacking the Atkinson Dynamics Intercom, examine it for damage that may have
occurred in transit. If the equipment has been damaged, do not attempt to install or operate it,
and file a claim immediately with the carrier stating the extent of the damage. Carefully check
all envelopes, shipping labels and tags before removing or destroying them.
Before attempting to install the intercom, be sure that all parts listed in the KIT CONTENTS
LIST have been supplied.
C. Kit Contents List.
Qty. Description Part Number
1 Resistor, 1K, 1W 101216
D. Mounting.
CAUTION
The selection of the mounting location for the device, its controls and the routing of the wiring
is to be accomplished under the direction of the facilities and the safety engineer.
NOTE
Intercoms supplied with flexible cords for connection to field wiring are not intended
for permanent mounting.
The intercom is intended to be mounted on any relatively flat and rigid surface by the two
mounting ears on the exterior of the housing. Figure 9 is a dimensional outline drawing
showing the proper mounting configuration. The two mounting ears are 13/32" diameter holes
spaced 5.68" apart. Hardware for mounting the intercom to the surface shall be provided by the
installer.
WARNING
This unit is heavy and should be mounted on a rigid surface capable of supporting the weight
of the intercom.
WARNING
For shipboard applications, installations shall be in accordance with the United States Coast Guard,
Title 46 CRF, Parts 110-113.
For units using the noise cancelling hand-held microphone, install the supplied microphone
mounting clip on any rigid surface near the intercom. Avoid locating the microphone where it
may be exposed to excessive moisture or dust.
E. Electrical Connections.
Plug each intercom into a nearby power source with a protective earth grounding. The plug
should remain readily accessible for disconnection. Connect the audio inputs in parallel.
Audio wires should be sized properly by your licensed installation electrician for your
specified application.
Optional: A 1K, 1W resistor is included in a kit with each intercom. Installing the resistor
across the audio lines helps to reduce noise in certain environments. Only one resistor needs to
be installed on the lines for any system installation.
See figures 1 through 19 for typical intercom connections and wiring information.
-4-
F. Service.
1. General.
Federal Signal will service your equipment or provide technical assistance with any
problems that cannot be handled locally.
Any units returned to Atkinson Dynamics for service, inspection, or repair must be
accompanied by a Return Material Authorization. This R.M.A can be obtained only from the
factory by calling (888)751-1500.
At this time a brief explanation of the service requested or the nature of the malfunction,
should be given.
Address all communications and shipments to:
ATKINSON DYNAMICS
Service Department
2645 Federal Signal Drive
University Park, IL 60466-3195
-5-
-6-
2. Replacement Parts.
WARNING
Replace fuse with GMC-1/2 only. DO NOT substitute.
Description Part Number
Belt switch assembly K137146B
Connector, 3-Position (12/24V PC Boards) K140411A-03
Cover plate gasket K8590013B
Fuse, GMC-1/2 K148A155A
Headset assembly K137145A
Knob, volume control K141A129A
Microphone assembly K137144A
PC Board, 120VAC K2001875B
PC Board, 120VAC, w/headset K2001875B-M34
PC Board, 12V, AD-26 K2001878B
PC Board, 12V, AD-26-7 K2001878B-06
PC Board, 12V, AD-26-8 K2001896B-01
PC Board, 12V, AD-26-8-M44 K2001896B
PC Board, 12V, AD-26A K2001878B-05
PC Board, 12V, AD-26C K2001878B-01
PC Board, 12V, AD-26D K2001878B-02
PC Board, 12V, AD-26SA-25 K2001878B-17
PC Board, 240VAC K2001875B-01
PC Board, 240VAC, w/headset K2001875B-01M34
PC Board, 24V, AD-26SA-25 K2001878B-19
PC Board, 24V, AD-56 K2001878B-07
PC Board, 24V, AD-56-8 K2001896B-03
PC Board, 24V, AD-56-8-M44 K2001896B-02
PC Board, 24V, AD-56A K2001878B-12
PC Board, 24V, AD-56C K2001878B-08
PC Board, 24V, AD-56D K2001878B-09
PC Board, 120VAC, -1 Models K2001885A
PC Board, 240VAC, -1 Models K2001885A-01
Kit, potentiometer w/ on/off switch K8590236A
Kit, push button switch (12/24V models) K8590242A
Kit, push button switch (120/240V models) K8590241A
Resistor, 1K, 1W K101216A
Rubber boot, push button switch K288697A
Rubber boot, toggle switch K288696A
Rubber boot, volume control K288A542A
Kit, toggle switch, DPDT K8590238A
Kit, potentiometer, 10K Ohm K8590237A
Kit, toggle switch, 3PDT (AD-27A-M34 & AD-27A-4-M34 only) K122342A
Kit, toggle switch, 3PDT K8590239B
Kit, pushbutton switch, 3PDT K8590288A
Kit, potentiometer, 1K Ohm K8590289A
Voice Coil/Diaphragm Assembly-Series C K8590181A
G.Warranty.
Atkinson Dynamics guarantees their intercoms to be free of defects at the time of delivery. If
damage is found to be a factory defect, Atkinson Dynamics will warrant all labor charges for
repair for one full year, and all replacement parts for two full years.
-7-
290A3693
BLK
WHT
BLK
WHT
AUDIO LINE
TO OTHER INTERCOMS
1K
1WATT
AUDIO CABLE
REMOTE A REMOTE B
AUDIO CABLE
1
3
2
1
3
2
4
BLK
WHT
GRN
*
SEE POWER
CONNECTIONS
*
BLK
WHT
GRN
*
Reminders:
• Before installing remote intercoms, precautions should be taken to prevent feedback
between two or more remotes in close proximity and acoustically reflective areas.
• 16–20 gauge low voltage audio cable. Twisted pair not required..
• Shielded audio cable not required unless operating in high electromagnetic fields. Ground
one end of the shield to earth ground.
• Type of power cable depends on intercom model.
• 7 foot provided for audio and power.
Operating Principle:
• When one talks, all intercoms will hear.
• To talk to other stations, press the talk/
listen switch and speak into the speaker/
microphone.
Release talk switch to listen.
NOTES:
1. Speaker/Microphone
2. Off/On/Speaker Volume Control
3. Talk/Listen Switch
4. “Call” Tone Switch
Power
Remote A
Remote B
12–18VDC AD-26 AD-26A
120V 50/60Hz AD-27 AD-27A
22-30VDC AD-56 AD-56A
240V 50/60Hz AD-57 AD-57A
POWER CONNECTIONS:
BLK +DC Power 12/24V Models
HOT 120/240V
Models
WHT Common 12/24V Models
Neutral 120/240V
Models
GRN Earth Ground 120/240V
Models only
1
BLK
WHT
GRN
*
290A3694
BLK
WHT
BLK
WHT
AUDIO
COMMON
REMOTE A REMOTE B
TO OTHER
REMOTES
1K
1WATT
1
3
5
2
1
3
2
4
BLK
WHT
GRN
*
SEE POWER
CONNECTIONS
*
Operating Principle:
• When one talks, all remotes will hear.
• To talk, press talk switch and speak into speaker/
microphone. Release talk switch to listen.
• To talk into hand-held microphone, press talk switch
on microphone and speak into microphone element.
NOTES:
1. Speaker/Microphone
2. Off/On/Speaker volume control
3. Talk/Listen switch
4. “Call” Tone push button switch
5. #137144 hand-held, noise cancelling microphone
with push-to-talk switch
Power
Remote A
Remote B
12–18VDC AD-26-7 AD-26A-7
120V 50/60Hz AD-27-7 AD-27A-7
22-30VDC AD-56-7 AD-56A-7
240V 50/60Hz AD-57-7 AD-57A-7
POWER CONNECTIONS:
BLK +DC Power 12/24V Models
HOT 120/240V Models
WHT Common 12/24V Models
Neutral 120/240V Models
GRN Earth Ground 120/240V
Models only
-8-
Reminders:
• Before installing remote intercoms, precautions should be taken to prevent feedback between
two or more remotes in close proximity and acoustically reflective areas.
• 16–20 gauge low voltage audio cable. Twisted pair not required.
• Shielded audio cable not required unless operating in high electromagnetic fields. Ground one
end of the shield to earth ground.
• Type of power cable depends on intercom model.
• 7 foot (2 meter) cable provided for audio and power.
2
290A3695
GRN
BLK
WHT
GRN
BLK
WHT
1K
1WATT
AUDIO
COMMON
(+) DC POWER
3/16-20 AWG
REMOTE A REMOTE B
1
3
2
1
3
2
BLK
WHT
GRN
*
SEE POWER
CONNECTIONS
*
Operating Principle:
• When one talks, the other stations will hear.
• To talk into the intercom, press the talk switch
and speak into the speaker/microphone.
Release to listen.
NOTES:
1. Speaker/Microphone
2. Off/On/Speaker volume control
3. Talk/Listen Switch
Power
Remote A
Remote B
Not applicable AD-26-1
120V 50/60Hz AD-27-1
240V 50/60Hz AD-57-1
POWER CONNECTIONS:
BLK +DC Power 12/24V Models
HOT 120/240V Models
WHT Common 12/24V Models
Neutral 120/240V Models
GRN Earth Ground 120/240V
Models only
3
-9-
GRN
BLK
WHT
GRN 1
BLK 3
WHT 2
GRN 1
BLK 3
WHT 2
AUDIO
COMMON
CONTROL
290A3696
MASTER "A" MASTER "B" SLAVE
1
3
4
5
2
1
1
3
2
2
1K
1
WATT
SEE POWER
CONNECTIONS
BLK
WHT
GRN
*
*
BLK
WHT
GRN
*
BLK
WHT
GRN
*
Operating Principle:
• Masters normally listen to slave.
• Slave talks to master hands-free,
without having to press a talk switch.
• When any master talks, slave hears.
Other masters will hear.
• To talk into master, press talk switch
and speak into speaker/microphone.
Release talk switch to listen.
• To talk into hand-held microphone,
press talk switch on microphone and
speak into microphone element.
NOTES:
1. Speaker/Microphone
2. Off/On/Speaker volume control
3. Press-to-talk Switch
4. #137144 hand-held, noise cancelling
microphone
5. 3-conductor/16–22 gauge cable. Use
shielded cable in electrically noisy
areas. Ground one end of the shield to
“earth” ground. Ground chassis of DC
unit to ground.
Before installing remote intercoms, precautions should be taken to prevent feedback
between two or more remotes in close proximity and acoustically reflective areas.
Power Master A Master B Slave
12–18VDC AD-26C-7 AD-26C AD-26D
120V 50/60Hz AD-27C-7 AD-27C AD-27D
22-30VDC AD-56C-7 AD-56C AD-56D
240V 50/60Hz AD-57C-7 AD-57C AD-57D
POWER CONNECTIONS:
BLK +DC Power 12/24V Models
HOT 120/240V Models
WHT Common 12/24V Models
Neutral 120/240V Models
GRN Earth Ground 120/240V
Models only
4
-10-
290A3702
BLK
WHT
BLK
WHT
AUDIO
COMMON
REMOTE
TO OTHER
INTERCOMS
1
3
7
5
6
2
4
SEE POWER
CONNECTIONS
BLK
WHT
GRN
*
*
BLK
WHT
GRN
*
1K
1
WATT
Operating Principle:
• When one talks, all remotes will hear.
• To talk into remote, press talk switch and talk
into speaker/microphone. Release talk switch
to listen. (The headset speaker selector switch
must be in “speaker” position to hear received
audio signal on speaker.)
• To talk into headset, press belt “talk” switch
and talk into headset microphone. Release belt
switch to listen. (The selector switch must be
in “headset” position.)
NOTES:
1. Speaker/Microphone
2. Off/On/Speaker volume control
3. Talk/Listen switch
4. Headset/Speaker selector switch
5. “Call” push button switch
6. #137146 Belt switch w/15 foot cord
7. #137145 Headset w/noise cancelling
microphone
Before installing remote intercoms, precautions should be taken to prevent feedback
between two or more remotes in close proximity and acoustically reflective areas.
Power
Remote A
12–18VDC AD-26A-M34
120V 50/60Hz AD-27A-M34
22-30VDC AD-56A-M34
240V 50/60Hz AD-57A-M34
POWER CONNECTIONS:
BLK +DC Power 12/24V Models
HOT 120/240V Models
WHT Common 12/24V Models
Neutral 120/240V Models
GRN Earth Ground 120/240V
Models only
5
-11-
BLK
WHT
BLK 1
WHT 2
AUDIO
200 FT. MAX.
COMMON
290A3742B
MASTER
REMOTE
SLAVE
STATION
1
3
2
1
2
1K
1WATT
SEE POWER
CONNECTIONS
BLK
WHT
GRN
*
*
POWER CONNECTIONS:
BLK +DC Power 12/24V Models
HOT 120/240V Models
WHT Common 12/24V Models
Neutral 120/240V Models
GRN Earth Ground 120/240V
Models only
NOTES
1. Speaker/Microphone
2. Off/On Speaker Volume Control
3. Talk/Listen Switch
4. Remote Slave Station
Model AD-SV-25
Operating Principle:
1. Slave station is both a speaker and a microphone.
2. Master is normally in “Listen” mode
until the talk button is pressed to talk to remote.
3. Volume controls are for received signal volume only.
They do not control transmitted signals.
POWER MASTER
12-18VDC AD-26-8
22-32VDC AD-56-8
120V 50/60 Hz AD-27-8
6
-12-
BLK
WHT
BLK 1 WHT 2
AUDIO
200 FT. MAX.
COMMON
290A3743B
MASTER
SPEAKER
1
3
2
5
4
SEE POWER
CONNECTIONS
BLK
WHT
GRN
1K
1WATT
*
*
NOTES:
1. Speaker/Microphone
2. Off/On/Speaker volume control
3. Talk/Listen switch
4. Outgoing Volume Control
5. Speaker Model AD-SS-25 with swivel mounting
bracket or Speaker Model AD-SF-25 with holes
in outer flange for flush mounting
Operating Principle:
1. Slave station is both a speaker and a microphone.
2. Master is normally in “Listen” mode until the talk button is pressed to talk to remote.
3. Outgoing and incoming volumes are controlled by separate controls on master.
POWER CONNECTIONS:
BLK +DC Power 12/24V Models
HOT 120/240V Models
WHT Common 12/24V Models
Neutral 120/240V Models
GRN Earth Ground 120/240V
Models only
POWER MASTER
12-18VDC AD-26-8-M44
22-32VDC AD-56-8-M44
120V 50/60 Hz AD-27-8-M44
240V 50/60 Hz AD-57-8-M44
7
-13-
GRN
RED
WHT
BLK
GRN 1
RED 3
WHT 4
BLK 2
GRN 1
RED 3
WHT 4
BLK 2
AUDIO
+ DC POWER
COMMON
CONTROL
290A3744
MASTER "A" MASTER "B" SLAVE
1
3
4
5
2
1
1
3
2
2
POWER
(+)
(
-
)
1K
1WATT
Operating Principle:
1. Masters normally listen to
slave.
2. Slave talks to masters
“hands-free”, without having to
press a talk switch.
3. When any master talks, slave
hears. Other master will hear.
4. To talk into master, press talk
switch and speak into speaker/
microphone. Release talk
switch to listen.
5. To talk into hand-held
microphone, press talk switch
on microphone and speak into
microphone element.
NOTES:
1. Speaker/Microphone
2. Off/On/Speaker Volume
Control
3. Press-to-Talk Switch
4. #137144 Hand-held, noise-
cancelling microphone with
push-to-talk switch
POWER
MASTER A
MASTER B
SLA
VE
12-18VDC AD-26C-1-7 AD-26C-1 AD-26D-1
22-32VDC AD-56C-1-7 AD-56C-1 AD56D-1
8
-14-
9
290A4065
BLK
WHT
BLK
GRN
RED
WHT
1K
1WATT
AUDIO
COMMON
REMOTE A REMOTE B
1
3
2
BLK
WHT
GRN
*
SEE POWER
CONNECTIONS
TO OTHER
INTERCOMS
*
1
3
4
2
BLK
WHT
GRN
*
Operating Principle:
• When one talks, all intercoms will hear.
• To talk to other stations, press the talk/listen switch and speak
into the speaker/microphone. Release talk switch to listen.
• To use external talk switch, close switch and speak into the
speaker/microphone.
NOTES:
1. Speaker/Microphone
2. Off/On/Speaker Volume Control
3. Talk/Listen Switch
4. Customer-Supplied External Normally-Open Talk/Listen
Switch, Momentary (e.g., foot switch)
Power
Remote A
Remote B
12-18VDC AD-26 AD-26-2
120V 50/60Hz AD-27 AD-27-2
22-30VDC AD-56 AD-56-2
240V 50/60Hz AD-57 AD-57-2
POWER CONNECTIONS:
BLK +DC Power 12/24V Models
HOT 120/240V Models
WHT Common 12/24V Models
Neutral 120/240V Models
GRN Earth Ground 120/240V Models only
-15-
GRN
WHT
BLK
GRN
WHT
BLK
GRN
WHT
BLK
AUDIO
CONTROL
COMMON
290A4066
MASTER "A" MASTER "B" SLAVE
3
4
2
1
3
2
2
1K
1
WATT
SEE POWER
CONNECTIONS
BLK
WHT
GRN
*
*
BLK
WHT
GRN
*
BLK
WHT
GRN
*
RED
BLU
1
POWER CONNECTIONS:
BLK +DC Power 12/24V Models
HOT 120/240V Models
WHT Common 12/24V Models
Neutral 120/240V Models
GRN Earth Ground 120/240V Models only
Operating Principle:
• Masters normally listen to slave.
• Slave talks to master hands-free, without having to
press a talk switch.
• When any master talks, slave hears. Other masters
will hear.
• To talk into master, press talk switch and speak into
speaker/microphone. Release talk switch to listen.
• Master “A” can talk by pressing either the talk switch
or external switch (customer supplied).
NOTES:
1. Speaker/Microphone
2. Off/On/Speaker Volume Control
3. Press-To-Talk Switch
4. Customer-Supplied External Normally-Open Press-
To-Talk Switch, Momentary (e.g., foot switch)
Power
Master A
Master B
Slave
12-18VDC AD-26C-2 AD-26C AD-26D
120V 50/60Hz AD-27C-2 AD-27C AD-27D
22-30VDC AD-56C-2 AD-56C AD-56D
240V 50/60Hz AD-57C-2 AD-57C AD-57D
10
-16-
11
-17-
POWER CONNECTIONS:
BLK +DC POWER 12/24V Models
HOT 120/240V Models
WHT Common 12/24V Models
Neutral 120/240V Models
GRN Earth Ground 120/240V Models only
POWER
REMOTE RA
REMOTE RB
REMOTE RC
12VDC AD-26-6 AD-26A-6 AD-26T-6
120V 50/60Hz AD-27-6 AD-27A-6 AD-27T-6
240V 50/60Hz AD-57-6 AD-57A-6 AD-57T-6
** Refer to remote model number as an example for Master.
NOTES:
1. Desk Set speaker (microphone is mounted on handset)
2. Desk Set speaker volume control
3. Handset earpiece volume control (mounted on back of case)
4. Speaker/Microphone
5. Off/On/Speaker volume control
6. Talk/Listen switch
7. “Call” Tone Switch
8. Master switch box — customer supplied
9. DPDT selector (toggle) switch — customer supplied
Operating Principle:
1. Master can select (via master switch box) to talk to any one or more remotes.
2. Any remote can initiate a call to Master regardless of selector switch being on
or off. Remote must specify its location. Remotes cannot talk to other
remotes.
3. To talk into intercom, press talk switch and speak into speaker/microphone.
Release talk switch to listen.
4. For Master to talk to remote, select desired remote via selector switch, press
talk switch on handset microphone and talk into handset microphone.
290A4067B
REMOTE RB
MASTER DESK SET
MASTER WALL MOUNT
INTERCOM
4
5
7
SEE POWER
CONNECTIONS
BLK
WHT
GRN
*
*
*
**
**
REMOTE RA
4
8
6
3
5
BLK
WHT
GRN
BLK
WHT
GRN
REMOTE RC DESK SET
BLK
WHT
GRN
TO OTHER REMOTES
4
6
5
BLK
WHT
GRN
*
*
*
WHT
GRN
RED
BLK
BLK
RED
GRN
WHT
TALK COM.
TALK
LISTEN
LISTEN COM.
TALK COM.
TALK
LISTEN
LISTEN COM.
TALK COM.
TALK
LISTEN
LISTEN COM.
TALK COM.
TALK
LISTEN
LISTEN COM.
BLK
RED
GRN
WHT
BLK
RED
RC
RB
RA
GRN
WHT
2
3
2
9
9
1
1
6
12
NOTES:
1. Speaker/Microphone
2. Off/On/Speaker volume control
3. Outgoing Volume Control
4. Speaker Model AD-SS-25 with swivel mounting
bracket or Speaker Model AD-SF-25 with holes
in outer flange for flush mounting
5. PTT (press-to-talk) switch—customer supplied
OPERATING PRINCIPLE:
1. Master station is both a speaker and a microphone.
2. Master is normally in “Listen” mode until the PTT (press-to-talk) switch is pressed to
talk to slave.
3. Outgoing and incoming volumes are controlled by separate controls on slave.
4. Slave talks to master hands-free, without having to press a talk switch.
POWER CONNECTIONS:
BLK +DC Power 12/24V Models
WHT Common 12/24V Models
POWER SLAVE
12-18VDC AD-26D-8-M44
GRN
WHT
RED
BLK
GRN 1 WHT 2
AUDIO
CONTROL
200 FT. MAX.
COMMON
290A4068
SLAVE
MASTER SPEAKER
1
2
4
3
SEE POWER
CONNECTIONS
BLK
WHT
1K
1WATT
*
*
5
MASTER
SPEAKER
-18-
13
Operating Principle:
• When one talks, all intercoms will hear.
• To talk to other stations, press the talk/listen switch and
speak into the speaker/microphone. Release talk switch to
listen.
• Pressing the call button on remote A provides a contact
closure for an attention-getting auxiliary signaling device,
e.g. a strobe light.
NOTES:
1. Speaker/Microphone
2. Off/On/Speaker Volume Control
3. Listen/Talk Switch
4. “Call” Switch
5. Customer-Supplied Auxiliary Signaling Device (e.g., strobe
light)
Power
Remote A
Remote B
12-18VDC AD-26-3 AD-26
120V 50/60Hz AD-27-3 AD-27
22-30VDC AD-56-3 AD-56
240V 50/60Hz AD-57-3 AD-57
POWER CONNECTIONS:
BLK +DC Power 12/24V Models
HOT 120/240V Models
WHT Common 12/24V Models
Neutral 120/240V Models
GRN Earth Ground 120/240V Models only
BLK
AUDIO CABLE AUDIO CABLE
TO OTHER
INTERCOMS
AUDIO
LINE
RED
WHT
BLK
-
POWER
+
POWER
WHT
GRN
290A4069
REMOTE "A" REMOTE "B"
AUXILLIARY
SIGNALING DEVICE
1
5
3
2
1K
1
WATT
SEE POWER
CONNECTIONS
BLK
WHT
GRN
*
*
BLK
WHT
GRN
*
1
3
2
4
-19-
14
-20-
Operating Principle:
• Master presses talk switch to talk to remote.
• Master can turn monitor switch on and hear
everything going on at remote.
• When master monitor switch is off, remote must
press talk switch to talk to master.
• When master monitor switch is on, remote can talk
to master hands-free without pressing the talk
switch.
• Master supplies power to remote unit.
NOTES:
1. Speaker/Microphone
2. Off/On/Speaker Volume Control
3. Press-To-Talk Switch
4. Master Monitor Switch
Power
Master
Remote
Not applicable AD-26-1-2
120V 50/60Hz AD-27C-1-M22
POWER CONNECTIONS:
BLK HOT 120/240V Models
WHT Neutral 120/240V Models
GRN Earth Ground 120/240V Models
GRN
BLK
WHT
GRN
BLK
WHT
AUDIO
COMMON
CONTROL
RED RED
(+) POWER
290A4070
MASTER REMOTE
1
3
2
4
1
3
2
1K
1
WATT
SEE POWER
CONNECTIONS
BLK
WHT
GRN
*
*
15
-21-
GRN
BLK
WHT
GRN
BLK
WHT
AUDIO
COMMON
CONTROL
290A4071
MASTER SLAVE
1
3
2
4
1
3
2
1K
1
WATT
SEE POWER
CONNECTIONS
BLK
WHT
GRN
*
*
BLK
WHT
GRN
*
Operating Principle:
• Master presses talk switch to talk to slave.
• Master can turn monitor switch on and hear
everything going on at slave.
• When master monitor switch is off, slave must
press talk switch to talk to master.
• When master monitor switch is on, slave can talk
to master hands-free without pressing the talk
switch.
NOTES:
1. Speaker/Microphone
2. Off/On/Speaker Volume Control
3. Press-To-Talk Switch
4. Monitor On/Off Switch
Power
Master
Slave
120V 50/60Hz AD-27C-M22 AD-27-2W3
POWER CONNECTIONS:
BLK HOT 120/240V Models
WHT Neutral 120/240V Models
GRN Earth Ground 120/240V Models
16
-22-
GRN
RED
WHT
BLK
GRN
RED
WHT
BLK
GRN
RED
WHT
BLK
AUDIO
+ DC POWER
COMMON
CONTROL
290A4072
MASTER "A" SLAVE MASTER "B"
3
3
2
4
8
4
1
7
7
2
2
1
1
DC POWER
(+)
(
-
)
1K
1WATT
5
6
4
RED
BLK
GRN
WHT
SPKR HEADSET SPKR HEADSET SPKR HEADSET
Operating Principle:
• Masters normally listen (monitor) slave.
• Slave can talk to master hands-free without
having to press a talk switch.
• When one station talks, other stations will
hear.
• To talk to other stations, master must press a
talk switch on intercom or on belt switch.
• Master and slave can select to talk/listen on
either the speaker/microphone or headset via
selector switch.
NO
TES:
1. Speaker/Microphone
2. Off/On/Speaker Volume Control
3. Press-To-Talk Switch
4. Headset/Speaker Selector Switch
5. #137145 Headset w/noise-canceling
microphone
6. #137146 Belt switch w/15 ft. cord
7. Receptacle for headset
8. 12 ft. cord for remote customer-supplied
headset receptacle
P
o
wer
Master A
Master B
Sla
v
e
12-18VDC AD-26C-1-M80 AD-26C-1-M34 AD-26D-1-M34
PO
WER CONNECTIONS:
RED +DC Power 12/24V Models
WHT Common 12/24V Models
17
-23-
GRN
RED
WHT
BLK
GRN
WHT
OBSERVE COLOR CODE
GRN
RED
WHT
BLK
AUDIO
+ DC POWER
COMMON
CONTROL
AUDIO
+ DC POWER
COMMON
CONTROL
290A4073
MASTER "A" MASTER "B" SLAVE
3
5
2
1
3
2
2
POWER
(+)
(
-
)
1K
1WATT
1
4
RED
BRN
OR YEL
*
BLU (+ DC POWER FROM MASTER "B")
*
BLK (CONTROL FROM MASTER "B")
*
Operating Principle:
• Master normally listens to slave.
• Slave talks to master hands-free, without
having to press a talk switch.
• When any master presses talk switch, slave
hears. Other master will also hear.
• To talk into master, press talk switch and
speak into speaker/microphone. Release
talk switch to listen.
• Master B can talk by pressing either the talk
switch or external switch (customer
supplied).
NOTES:
1. Speaker/Microphone
2. Off/On/Speaker Volume Control
3. Press-To-Talk Switch
4. External Press-To-Talk Switch, Momentary
(e.g., foot switch)
5. 4-conductor/16-22 gauge cable. Use
shielded cable in electrically noisy areas.
Ground one end of the shield to “earth”
ground. Ground chassis of DC units to
ground.
Power
Master A
Master B
Slave
12-18VDC AD-26C-1 AD-26C-1-2 AD-26D-1
22-30VDC AD-56C-1 AD-56C-1-2 AD-56D-1
POWER CONNECTIONS:
BLK +DC Power 12/24V Models
WHT Common 12/24V Models
18
-24-
Operating Principle:
• Master can select to monitor any one or more remotes via
master switch box.
• To talk to remote(s), master closes desired selector switch,
presses talk switch, and speaks into the speaker/microphone.
Master releases talk switch to listen.
• Selected remote(s) talk to master “hands-free” without having
to press remote talk switch.
• Remotes cannot talk to other remotes.
• Remotes not selected by master cannot talk hands-free and
must press talk switch to initiate call to master.
• When initiating a call to master, remote must specify its
location for master to respond.
NOTES:
1. Speaker/Microphone
2. Off/On/Speaker Volume Control
3. Talk/Listen Switch
4. Master Selector Switch (customer supplied)
5. Double-Pole (OFF-ON) Toggle Selector Switch
Power
Master
Remotes
120V 50/60Hz AD-27C-1 AD-27D-M49
POWER CONNECTIONS:
BLK HOT 120/240V Models
WHT Neutral 120/240V Models
GRN Earth Ground 120/240V Models
290A4074
REMOTE "B"
MASTER
SEE POWER
CONNECTIONS
MASTER SELECTOR SWITCH BOX
TO REMOTE RB
*
REMOTE "A"
1
4
2
BLK
WHT
GRN
TO OTHER REMOTES
1
3
2
BLK
WHT
GRN
*
*
BLK
WHT
GRN
*
BLK
RED
GRN
WHT
BLK
RED
GRN
WHT
BLK
RED
GRN
WHT
BLK
RED
RC
RB
RA
GRN
WHT
5
3
1
2
3
19
WIRING REFERENCE CHART
AUDIO CABLE POWER CABLE
MODEL NO. BLACK WHITE GREEN RED BLACK WHITE GREEN
AD-26-1-M34 +DC POWER COMMON AUDIO N/A* N/A* N/A* N/A*
AD-26C-M34 CONTROL COMMON AUDIO N/A* 12-18 VDC COMMON N/A*
AD-26C-7-M82 CONTROL COMMON AUDIO N/A* 12-18 VDC COMMON N/A*
AD-26D-1-M82 +DC POWER COMMON AUDIO CONTROL N/A* N/A* N/A*
AD-26D-1-M84 +DC POWER COMMON AUDIO CONTROL N/A* N/A* N/A*
AD-26SA-25 AUDIO COMMON N/A* N/A* 12-18 VDC COMMON N/A*
AD-27-M34 AUDIO COMMON N/A* N/A* 120V 50/60 Hz NEUTRAL EARTH GND
AD-27-M82 AUDIO COMMON N/A* N/A* 120V 50/60 Hz NEUTRAL EARTH GND
AD-27-M83 AUDIO COMMON N/A* N/A* 120V 50/60 Hz NEUTRAL EARTH GND
AD-27A-4-M34 AUDIO COMMON N/A* N/A* 120V 50/60 Hz NEUTRAL EARTH GND
AD-27A-7-M83 AUDIO COMMON N/A* N/A* 120V 50/60 Hz NEUTRAL EARTH GND
AD-27C-1(-4) +DC POWER COMMON AUDIO CONTROL 120V 50/60 Hz NEUTRAL EARTH GND
AD-27C-1-7(-4) +DC POWER COMMON AUDIO CONTROL 120V 50/60 Hz NEUTRAL EARTH GND
AD-27C-M34 CONTROL COMMON AUDIO N/A* 120V 50/60 Hz NEUTRAL EARTH GND
AD-27D-1 +DC POWER COMMON AUDIO CONTROL 120V 50/60 Hz NEUTRAL EARTH GND
AD-27SA-25 AUDIO COMMON N/A* N/A* 120V 50/60 Hz NEUTRAL EARTH GND
AD-56C-M34 CONTROL COMMON AUDIO N/A* 22-30 VDC COMMON N/A*
AD-56C-7-M82 CONTROL COMMON AUDIO N/A* 22-30 VDC COMMON N/A*
AD-56SA-25 AUDIO COMMON N/A* N/A* 22-30 VDC COMMON N/A*
AD-57-M83 AUDIO COMMON N/A* N/A* 240V 50/60 Hz NEUTRAL EARTH GND
AD-57A-1(-4) +DC POWER COMMON AUDIO N/A* 240V 50/60 Hz NEUTRAL EARTH GND
AD-57A-7-M83 AUDIO COMMON N/A* N/A* 240V 50/60 Hz NEUTRAL EARTH GND
AD-57C-M34 CONTROL COMMON AUDIO N/A* 240V 50/60 Hz NEUTRAL EARTH GND
AD-57SA-25 AUDIO COMMON N/A* N/A* 240V 50/60 Hz NEUTRAL EARTH GND
N/A*: Not Applicable
-25-
3.88 5.68
5.00 6.50
4.84
9.88
290A3697
.41
2 HOLES
∅
20
-26-
2561494H
REV. H Printed 11/06
Printed in U.S.A.
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