Federal Signal Corporation 310LD-MV, Installation And Service Instructions Manual, Page: 9 / 16

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The signal lines, remote control lines, remote power, and call dry con-
tacts are landed in a seven-position terminal block (J7) in the Class II
wiring compartment. The two wiring sections are isolated by a fishpa-
per barrier.
Disconnect power to the intercom before any installation,
maintenance, or configuration changes are performed.
There are three jumpers shown on the PC board in Figure 7
which may need to be moved depending on the desired operation of
the intercom. J4 and J5 are for operating the intercom in either a bal -
anced signal line or unbalanced signal line configuration. These must
be moved together as a pair. They are factory set in the balanced line
position. J3 is for configuring the intercom as either a master or slave
device. The intercom is factory set in the master position.
There is a switch on the board, in the Class I wiring compartment,
to configure the operation of the board from 120VAC to 240VAC. The
switch is factory set for the intercom to operate on 120VAC (see figure
3).
See figures 5 through 12 for typical intercom configurations.
F. SERVICE.
Any maintenance must be performed by a trained electrician
in accordance with NEC guidelines and local codes.
1. General.
The call signal is substantially louder than normal voice mes-
sages 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.
Federal Signal will service your equipment or provide techni-
cal assistance with any problems that cannot be handled locally.
Any units returned to Federal Signal for service, inspection, or
repair must be accompanied by a Return Material Authorization. This
R.M.A can be obtained from the local Distributor or Manufacturer’s
Representative.