Installation and Maintenance Manual

UNT-SVX07D-EN 73
Wired Controllers—Communication Wiring
Wiring Installation (ZN510 and
ZN520)
Tracer ZN510 and ZN520 controllers are LonTalk
®
devices
that interface with the Trane Tracer Summit building
management system. Reference the unit wiring diagram
or submittals.
Ground shields at each Tracer ZN510 and ZN520, taping
the opposite end of each shield to prevent any connection
between the shield and anther ground. Refer to the most
recent version of Trane publication CNT-SVX04A-EN
(Tracer ZN.520 Unit Controller: Installation, Operation and
Programming Guide) for the communication wiring
diagram.
Communication wire must conform to the following
specification:
1. Shielded twisted pair 18 AWG
2. Capacitance 23 (21–25) picofarads (pF) per foot
3. Listing/Rating—300 V 150C NEC 725-2 (b) Class 2 Type
CL2P
4. Trane Part No. 400-20-28 or equi
valent, available
through Trane BAS Buying Group Accessories catalog.
Note: Co
mmunication link wiring is a shielded, twisted
pair of wire and must comply with applicable
electrical codes.
Follow these general guidelines when installing
communication wiring on units with a Tracer ZN510 or
ZN520 controller:
• Maintain a maximum 5000 ft. aggregate run.
• Install all communication wiring in accordance with
the NEC and all local codes.
• Solder the conductors and insulat
e (tape) the joint
sufficiently when splicing communication wire. Do not
use wire nuts to make the splice.
• Do not pass communication wiring between buildings
be
cause the unit will assume different ground
potentials.
• Do not run power in the same conduit or wire bundle
with
communication link wiring.
Note: Y
ou do not need to observe polarity for LonTalk
communication links.
Device Addressing
LonTalk devices are given a unique address by the
manufacturer. This address is called a Neuron ID. Each
Tracer ZN510 and ZN520 controller can be identified by its
unique Neuron ID, which is printed on a label on the
controller’s logic board. The Neuron ID is also displayed
when communication is established using Tracer Summit
or Rover service tool. The Neuron ID format is
00-01-64-1C-2B-00.
Wire Characteristics
Controller communication-link wiring must be low
capacitance, 18-gage, shielded, twisted pair with stranded,
tinned-copper conductors. For daisy chain configurations,
limit the wire run length to 5,000 ft. Truck and branch
configurations are significantly shorter. LonTalk wire
length limitations can be extended through the use of a
link repeater.
Recommended Communication Wiring
Practices
The following guidelines should be followed while
installing communication wire.
• LonTalk is not polarity sensitive. Trane recommends
that the installe
r keep polarity consistent throughout
the site.
• Only strip away two inches ma
ximum of the outer
conductor of shielded cable.
• Make sure that the 24 Vac power supplies are
co
nsistent in how they are grounded. Avoid sharing
24 Vac between LonTalk UCMs.
• Avoid over-tightening cable ties and other forms of
ca
ble wraps. A tight tie or wrap could damage the
wires inside the cable.
• Do not run LonTalk cable alongside or in the same
co
nduit as 24 Vac power.
• In an open plenum, avoid lighting ba
llasts, especially
those using 277 Vac.
• Do not use a trunk and branch configuration, if
po
ssible. Trunk and branch configurations shorten the
distance cable can be run.
Wiring Installation (Tracer UC400)
This section provides information about wiring the UC400
controller. For more detailed information, refer to the
Tracer UC400 Programmable Controller Installation,
Operation, and Maintenance Manual (BAS-SVX20C-EN, or
the most recent revision).
UNT-SVX07_-EN.book Page 73 Friday, April 27, 2012 9:40 AM