Tracer® Uc400-B Controller - Trane UniTrane Installation, Operation And Maintenance Manual

ZN510 and ZN520 Controllers
Tracer® ZN510 and ZN520 controllers are LonTalk®
devices that interface with the Tracer® SC or Tracer®
Summit building automation system (BAS). 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.
Note: For more detailed information, refer to:
• CNT-SVX04A-EN Tracer® ZN520 Unit Controller:
Installation, Operation and Programming Guide for the
communication wiring diagram
Communication Wire Specifications
Communication wire must conform to the following
specification:
• Shielded twisted pair 18 AWG
• Capacitance 23 (21–25) picofarads (pF) per foot
• Listing/Rating—300 V 150C NEC 725-2 (b) Class 2 Type
CL2P
• Trane Part No. 400-20-28 or equivalent, available
through Trane BAS Buying Group Accessories catalog.
Note: Communication link wiring is a shielded, twisted
pair of wire and must comply with applicable
electrical codes.
Controller communication-link wiring must be low
capacitance, 18-gauge, 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.
General Wiring Guidelines
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 joint
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 bundle
with communication link wiring.
Note: You do not need to observe polarity for LonTalk
communication links.
UNT-SVX07J-EN
Recommended 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 throughout
the site.
• Only strip away two inches maximum of the outer
conductor of shielded cable.
• Make sure that the 24 Vac power supplies are
consistent in how they are grounded. Avoid sharing
24 Vac between LonTalk UCMs.
• Avoid over-tightening cable ties and other forms of
cable wraps. A tight tie or wrap could damage the
wires inside the cable.
• Do not run LonTalk cable alongside or in the same
conduit as 24 Vac power.
• In an open plenum, avoid lighting ballasts, especially
those using 277 Vac.
• Do not use a trunk and branch configuration, if
possible. Trunk and branch configurations shorten the
distance cable can be run.
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.
Tracer® UC400-B Controller
The Tracer® UC400-B single-zone VAV controller can be
used in a stand-alone application or as part of a Tracer®
control system.
In the stand-alone configuration, Tracer® UC400-B
receives operation commands from the zone sensor and/
or the entering water temperature sensor (on auto
changeover units).The reading from the entering water
temperature sensor and determines if the unit is capable
Installation - Controllers
85