UNT-SVX07B-EN 67
Controls Interface
Wired Controllers—Communication Wiring
Units with Tracer ZN510 and ZN520 Only
Communications
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: Com
munication 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 insulate (tape) the join
t sufficiently when splicing communication
wire. Do not use wire nuts to make the splice.
• Do not pass communication wiring between buildings because the
unit will assume different
ground potentials.
• Do not run power in the same conduit or wire bu
ndle 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 installer keep polarity consistent
thro
ughout the site.
• Only strip away two inches maximum of the o
uter conductor of shielded cable.
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