INSTALLATION AND SERVICE INSTRUCTIONS FOR MODEL AD-28X-MV
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 of 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 emergency 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, perma‑
nent 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 opera‑
tion. Any maintenance must be performed by a trained electrician in accordance with NEC guide‑
lines 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 AD‑28X‑MV intercom is a heavy duty, 2‑way, communications device designed for in‑
dustrial applications. Nominal operating voltages include 120/240VAC, 50/60Hz and 24VDC.
Voltage changes for the 120/240VAC are internally switch selectable and the AC line is fused
with a 1/2 amp 250 volt type GMC fuse. The unit also offers transformer isolated audio inputs
and internally selectable Master or Slave mode configurations. A call button with remote call
dry contacts is also factory supplied in the unit.
The AD‑28X‑MV has a Type 4X enclosure and is a UL Listed Type NM (non‑monitored)
signal appliance and Marine signal appliance for indoor or outdoor use and is CSA Certified.
The AD‑28X‑MV is additionally Listed for Class I, Groups A, B, C and D, Division 2; Class
II, Groups F and G, Division 2; and Class III.
Wire all circuits connected to the AD‑28X‑MV Intercom using Class I, Division 2 wiring
methods specified in Article 501-4 (b) of the NEC.
MASTER MODE:
The intercom can be configured as a Master unit (Push-to-Talk) or a Slave unit (Push-to-Listen)
by changing the MAS/SLA jumper (J2) on the printed circuit board (see Figure 6). The intercom
comes from the factory set in the Master (MAS) mode.
In the Master mode the intercom acts as an amplifier, constantly broadcasting over its speaker any
signal that it receives on the signal lines. Holding down the Listen/Talk switch changes the unit
from a speaker to a microphone (see Figure 1). The intercom will now transmit over the signal
lines to additional intercom(s) also set in the Master mode. When the switch is released it will
default back to the Listen or Speaker mode, allowing the user to receive any messages transmitted
back to it.
SLAVE MODE:
Some applications may require that the intercom constantly transmit (i.e. act as a microphone)
as opposed to constantly receive (i.e. act as a speaker). To accomplish this the intercom must be
configured in the Slave (Push-to-Listen) mode.
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