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INSTALLATION AND SERVICE INSTRUCTIONS FOR MODEL 310-MV, MODEL 310X-MV AND
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 thor‑
oughly 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 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, 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 310‑MV intercom is a heavy duty, 2‑way, communications device designed for industrial applications. Nominal operating
voltages include 120/240 Vac, 50/60 Hz and 24 Vdc. Voltage changes for the 120/240 Vac are internally switch selectable and
the AC line is fused with a 1/2 amp 250 volt type GMC fuse. The unit also offers internally selectable balanced or unbalanced
line operation, 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. An optional hand-held noise cancelling microphone is avail‑
able for high ambient noise applications.
The 310-MV and the 310X-MV have Type 4X enclosures and are UL Listed Type NM (non-monitored) signal appliances and
Marine signal appliances for indoor or outdoor use and they are CSA Certified signal appliances. The 310X-MV is addition‑
ally Listed for Class I, Division 2, Groups A, B, C and D; Class II, Division 2, Groups F and G; and Class III.
The 310‑MV‑MNC includes a hand‑held noise cancelling microphone and should be used only for indoor applications.
Wire all circuits connected to the 310X-MV Intercom using Class I, Division 2 wiring methods specified in Article 501-4 (b)
of the NEC.
MASTER MODE:
Each intercom can be configured as a Master unit (Push-to-Talk) or a Slave unit (Push-to-Listen) by changing the MAS/SLA
jumper (J7) on the printed circuit board (see figure 1). 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 2). 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 switched into the Slave (Push-to-Listen) mode.
To switch an intercom into the Slave mode there are three steps to follow.
Disconnect power to the intercom before any installation, maintenance, or configuration changes are performed.
Move the J2 jumper block on the P.C. board from the MAS to SLA position (see Figure 1). This can be done using long nose pli‑
ers, pulling the block off the "MAS" and center position and placing it on the "SLA" and center position.
An intercom configured in the Slave mode needs to have the Listen/Talk switch default to the talk position on the cover plate
(see Figure 3).
MODEL 310-MV-MNC
WARNING
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