Trane Tracer TD7 User Guide

RLC-
S
VU006A-E4
1
2
I
nstallation El
e
ctrical
In addition to Return and Outdoor Reset, the MP
provides a menu item for the operator to select a
Constant Return Reset. Constant Return Reset will reset
the leaving water temperature set point so as to provide
a constant entering water temperature. The Constant
R
eturn
R
eset equation is the same as the
R
eturn
R
eset
equation except on selection of Constant Return Reset,
the MP will automaticall
y
set Ratio, Start Reset, and
Maximum Reset to the
f
ollowing.
RATIO = 100
%
START RESET = Design Delta Temp
.
MAXIMUM RESET = Desi
g
n Delta Temp.
The equation for Constant Return is then as follows:
CWS’ = CWS + 100% (Design Delta Temp. - (TWE - TWL))
and CW
S
’ >
o
r = CW
S
and CW
S
’ - CW
S
<
o
r = Maximum Reset
When any ty
p
e of CWR is enabled, the MP will ste
p
the Active CWS toward the desired CWS’
(
based on
the above e
q
uations and setu
p
p
arameters
)
at a rate
of 1 de
g
ree F every 5 minutes until the Active CW
S
equals the desired CW
S
’. This applies when the chiller
is runnin
g
.
When the chiller is not running, CW
S
is reset
immediately
(
within one minute
)
for Return Reset and at
a rate of 1 de
g
ree F every 5 minutes for
O
utdoor Reset.
The chiller will start at the Differential t
o
S
tart value
above a fully reset CW
S
or CW
S
’ for both Return and
Outdoor Reset.
Communications Int
e
rfac
e
LonTalk™ Interface
(
LCI-C
)
UC800 provides an optional LonTalk™ Communication
Interface (LCI-C) between the chiller and a Buildin
g
Automation System
(
BAS
)
. An LCI-C LLID shall be used
to provide “
g
ateway” functionality between a LonTalk
compatible device and the Chiller. The inputs/outputs
include both mandatory and o
p
tional network variables
as established by the LonMark Functional Chiller Pro
fi
le
8
040.
Note:
For more information see ACC-SVN100*-EN.
:
BACnet Protocol
The Building Automation and Control Network (BACnet
a
nd ANSI/ASHRAE Standard 135-2004) protocol is a
standard that allows building automation systems or
com
p
onents from different manufacturers to share
i
n
f
ormation and control
f
unctions. BACnet provides
buildin
g
owners the capability to connect various
t
ypes of building control systems or subsystems
t
ogether
f
or a variety o
f
reasons. In addition, multiple
vendors can use this protocol to share information for
m
onitoring and supervisory control between systems
a
nd devices in a multi-vendor interconnected s
y
stem.
The BACnet protocol identifi es standard objects
(
data
points) called BACnet ob
j
ects. Each ob
j
ect has a defi ned
list of
p
ro
p
erties that
p
rovide information about that
ob
j
ect. BACnet also defi nes a number of standard
app
lication services that are used to access data and
m
anipulate these o
b
jects and provides a client/server
c
o
mmunicati
o
n between devices.
BACnet Testin
g
Laboratory
(
BTL
)
Certifi cation
All Tracer™ UC800 controllers are desi
g
ned to
su
pp
ort BACnet communication
p
rotocol. In
a
ddition,someparticular revisions o
f
the UC800
fi
rmware
h
ave been tested and have achieved BTL certifi cation by
a
n o
ffi
cial BACnet testing laboratory. For more details,
r
efer to the BTL website at www.bacnetassociation.or
g
.
Modbus RTU Protocol
Modicon Communication Bus (Modbus) is an application
layer-messa
g
in
g
protocol that, like BACnet, provides
client/server communication
b
etween devices over
a
variety of networks. Durin
g
communications on a
Modbus RTU network, the
p
rotocol determines how
each controller will
k
now its device address, recognize
a
message addressed to its device, determine what
a
ction to take, and extract any data or other information
contained in the message.
C
ontrollers communicate
using a master/slave technique, where
b
y, only one
d
evice
(
master
)
can initiate transactions
(
queries
)
. Other
d
evices (slaves) respond by supplying the requested
d
ata to the master or by ta
k
ing the action requested in
t
he query.
T
he master can address individual slaves or it can
i
nitiate a
b
roadcast message to all slaves.
I
n turn, the
s
l
aves respon
d
to queries t
h
at are a
dd
resse
d
to t
h
em
i
ndividually or broadcasted. The Modbus RTU protocol
establishes the format for the master’s query by placin
g
i
nto it the device address, a
f
unction code de
fi
nin
g
the
r
e
q
uested action, any data to
b
e sent, and an error-
checkin
g
fi
eld
.

Trane Tracer TD7 Specifications

General

Brand	Trane
Model	Tracer TD7
Category	Controller
Language	English