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dmc3-4
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Page 9
Removing the Old System
Prior to removing the existing intercom system make sure all power is
turned off at the intercom location. Remove the screws from the
intercom master and while removing the intercom, make sure to
carefully label each wire with its corresponding room location.
Disconnect all the room station and door station wires from the
master. Then carefully remove the existing wall housing and
transformers.
If the existing system was not working prior to replacement, check
each wire run between the room stations and master for shorts and
wiring integrity. If one of these room station to master wire runs has a
short, re-run that wire prior to installing the dmc3-4. When replacing
wire runs use M&S Systems MS4XSC shielded wire. This wire will work
for both 3 and 4-wire installations. On 4-wire installations use the wire
as is and on 3-wire runs do not use the white wire.
Note: if you encounter 120VAC running through the existing wall
housing, have a qualified electrician reroute the 120VAC around the
wall housing.
If you encounter a remote transformer, an additional electrical run
may have to be made by a qualified electrician to power the dmc
master and/or optional CD player. Also check to make sure that the
area around the housing is clear of any additional 120VAC runs or
other obstructions.
Installing the Wall
Housing
The dmc1H and dmc1HC housings are
designed for 16” on center studs. You
may encounter stud spacings that vary
from this standard. Use the dmc1H housing
when you are replacing an existing system
with an intercom only system. The dmc1HC housing is used for
Figure 1 – Transformer location
$QEG$QEG 1.1.