58 RTAD-SVX01F-E4
Installation - Electrical
Network variables
LonTalk uses network variables to
communicate points on a
communication link. LonMark has
defined a list of standard network
variables.
Chiller Functional Profile
LonMark calls their standard list of
variables for chiller control the
Chiller Functional Profile. This profile
is meant to allow interoperability
between control systems and
chillers, regardless of chiller type or
manufacturer.
The LCI-C Extension
The LCI-C Extension is a list of
additional network variables Trane
created that are over and above the
ones defined by the Chiller
Functional Profile. The LCI-C
Extension is considered "open"
because the network variables are
not proprietary. The network
variables in the LCI-C Extension are
defined in the "User defined types"
section.
LCI-C shipment and inspection
The LCI-C is either factory-installed
with the chiller controller or shipped
as an individual part for field
installation.
Storage
If the LCI-C is stored for a period of
time prior to being installed, it must
be protected from the elements. The
temperature of the storage location
should be between -40 °C and 70 °C
and the relative humidity should be
0-95%, non-condensing.
Communications
The Tracer LCI-C controller
communicates via Trane's LonTalk
protocol. Typically, a communication
link is applied between unit
controllers and a building
automation system. Communication
also is possible via Rover service
tool. Peer-to-peer communication
across controllers is possible even
when a building automation system
is not present.
You do not need to observe polarity
for LonTalk communication links.
The LonTalk communications
protocol allows peer to peer
communications between
controllers, which allows controllers
to share information or data. A
communicated variable input such
as setpoint, space temperature, or
outdoor air temperature has priority
over a locally wired input to the
controller.
Example: if the LCI-C controller has a
wired outdoor air temperature
sensor and Tracer Summit or
another LonTalk controller sends it a
communicated outdoor air
temperature, the communicated
value is used by the LCI-C controller.
If a communicated input value is
lost, the LCI-C controller reverts to
using the locally wired sensor input.
Device Addressing
LonTalk devices are given a unique
address by the manufacturer. This
address is called a Neuron ID. Each
LCI-C controller can be identified by
its unique Neuron ID, which is
printed on a label on the controller.
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.
LonTalk® Communications
Interface for Chillers (LCI-C)
The unit controller provides an
optional LonTalk Communication
Interface (LCI-C) between the chiller
and a Building Automation System
(BAS). An LCI-C LLID shall be used to
provide "gateway" functionality
between a LonTalk compatible
device and the chiller. The
inputs/outputs include both
mandatory and optional network
variables as established by the
LonMark Functional Chiller Profile
8040.
This section introduces the LCI-C
device for RTAD. For further
information please refer to the
manual ACC-SVN32A-EN.
If you are connecting the LCI-C to a
Tracer Summit™ system, you will
not need the network variable
information given in this part.
If you are connecting the LCI-C to a
non-Trane building automation
system using LonTalk™, Appendixes
A through B will provide you with
the system integration information
you will need regarding network
variables.
LonMark certification
The LonMark organization promotes
LonTalk as an industry standard for
control communication. The LCI-C is
certified to the LonMark Chiller
Functional Profile 8040 Version 1.0,
and follows LonTalk FTT-10A
communications system technology.
Compliance with this technology
means that the LCI-C can provide an
interface for non-Trane LonTalk
networks.
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