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LPC-SVX01C-EN

pre-startup
requirements

Installation

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. Comm5 wire
length limitations can be extended
through the use of a link repeater.

Wire capacitance (measured in picofar-
ads/foot [pF/ft] or picofarads/meter
[pF/m]) between conductors must be
23+/-2 pF/ft (72+/-6 pF/m).

Link Configuration and
Termination

Communication-link wiring must use one
of the following configurations:
• Daisy chain configuration (Figure I-IP-4)
• Trunk and branch configuration (Figure

I-IP-52)

• Limit total wire length to 5,000 ft.

Comm5 wire length limitations can be
extended through the use of a link
repeater.

• See the following section on

Termination resistance placement for
Comm5 links.

Figure I-IP-6. Daisy Chain Configuration for Communication-link Wiring (Preferred Configuration)

Follow these general guidelines when
installing communication wiring on units
with either a Tracer AH540 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 Comm5 communication links.

Device Addressing

Comm5 devices are given a unique
address by the manufacturer. This
address is called a Neuron ID. Each Tracer
AH540 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.

Communication Wiring

Units with Tracer AH540 Only

Communications

Tracer AH540 controllers have Comm5
communication ports. Typically, a
communication link is applied between
unit controllers and a building automation
system. Communication also is possible
via Rover™, Trane’s service tool. Peer-to-
peer communication across controllers is
possible even when a building
automation system is not present.

For example: If Tracer AH540 has a wired
outdoor air temperature sensor and
Tracer Summit or another Comm5
controller sends it a communicated
outdoor air temperature, the communi-
cated value is used by Tracer AH540
controller. If a communicated input value
is lost, the controller reverts to using the
locally wired sensor input.

The controller provides six 0.25-inch
quick-connect terminals for the Comm5
communication link connections, as
follows:
• Two terminals for communication to the

board

• Two terminals for communication from

the board to the next unit (daisy chain)

• Two terminals for a connection from

the zone sensor back to the controller

Note: Communication link wiring is a
shielded, twisted pair of wire and must
comply with applicable electrical codes.