Meridian
Systems
23
Zoning Design Guide
036-21478-001 Rev. A (0802)
York requires that all communication wire be 18 gauge
minimum, two wire shielded cable, Belden #82760 or
equivalent. York offers communications cable for this
purpose. The 18 gauge color coded and labeled wire is
available for the local loop and the network loop com-
munications wiring. The local loop wire is supplied in
1000 ft. spools and is labeled “Local Loop” with a
green candy stripe. The network loop wire is supplied
in 500 ft. spools and is labeled “Network Loop” with a
red candy stripe.
The loop is best connected in a daisy chain configura-
tion, meaning the loop is connected from one control-
ler to another. It is not necessary to sequentially ad-
dress the zone controllers in relation to their location
on the loop.
Even though the daisy chain configuration is preferred,
the star configuration can also be used. If required, a
combination of the two can also be used. Remember,
the best communications loop wiring is the one which
utilizes the minimum number of ends while using the
shortest wiring path.
Communication Wiring terminals on most Meridian
controllers are marked “T”, “R” and “SHLD” (Note:
instead of SHLD the CommLink is marked “G” and
the Basic Zone Manager is marked “SH”). All wiring
should be connected T to T, R to R and SHLD to SHLD
throughout the entire loop system. Communication wire
should be color coded to facilitate error free wiring.
The communication loops will not work if any of the
wires are reversed or otherwise landed incorrectly. Com-
munications loops can be run up to a maximum of ap-
proximately 4000 ft. in total length. If your system ex-
ceeds this length, please consult the York factory for
more information regarding extended communication
loop lengths and solutions.
Caution:
Unless the communications loop
is installed in conduit, be careful to
position the cable away from high
noise devices like fluorescent
lights, transformers, VFD’s, etc.
Conduit is not required for com-
munications loop wiring unless
required by local codes.
Tip:
Incorrect wiring of the communications
loop is the most common mistake made
during installation. Before beginning
installation, write down the wire color
used on each terminal connection and
consistently maintain that color code. It
is recommended that a continuous wire
run be made between devices. Anytime
a splice is made in the cable you increase
your chance of problems. If a splice must
be made, Never use wire nuts! Cable
should be soldered and wrapped or if
soldering is not possible use butt splice
crimp connectors and wrap tightly with
electrical tape.
Caution:
Make sure when you are inserting
wires into the terminal blocks that
strands of wire do not stick out and
touch the adjacent terminals. If
adjacent wires touch each other or
another terminal, shorting and
subsequent damage to the circuit
board could result
Figure 1-13: York Communications Wire
Local Loop Wire
Network Loop Wire
Summary of Contents for Meridian
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