2
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.
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 50/60 Hz; and AD‑57, 240VAC 50/60 Hz. The AC line
is fused with a 1/2 A, 250 V GMC fuse in the 120/240VAC units. A description of the
available models follows.
Basic Model Specifications
Model
AD-26
AD-56
AD-27
AD-57
Supply Voltage
12VDC
24VDC
120VAC,
50/60 Hz
240VAC,
50/60 Hz
Audio Power Output
(Max.)
8.0 W
11.7 W
11.3 W
11.3 W
Power Consumption
(Max.)
20.0 W
39.6 W
28.8 W
30.5 W
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 lb
10 lb
10 lb 11 oz
10 lb 11 oz
Dimensions
See Figure 20 on page 26
Ratings
UL, cUL, Marine‑Listed, CE (Model AD‑27)
NEMA‑Type 4X (excluding microphone models)
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