Trane Ascend ACR Series, Installation, Operation And Maintenance Manual, Page: 47 / 112

AC-SVX001A-EN 47
the desired CWS'. This applies when the chiller is
running.
When the chiller is not running, CWS is reset
immediately (within one minute) for Return Reset and
at a rate of 1 degree F every 5 minutes for Outdoor
Reset. The chiller will start at the Differential to Start
value above a fully reset CWS or CWS' for both Return
and Outdoor Reset.
Transformer Power Rating
See table below for power rating of optional
transformer (unit model number digit 28 = 1).
Unit Size
Power Rating
150 to 200 tons 340 kVA
225 to 300 tons 470 kVA
Communications Interface
LonTalk Interface (LCI-C)
UC800 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 L
ON
M
ARK
® Functional Chiller
Profile 8040.
N No otte e:: For more information see ACC-SVN100*-EN.
BACnet Interface (BCI-C)
Optional BACnet ® Communication Interface for
Chillers (BCI-C) is comprised of a Tracer ® UC800
controller with interface software. It is a non-
programmable communications module that allows
units to communicate on a BACnet
® communications
network.
N No otte e:: For more information, see BAS-SVP01*-EN.
Modbus Remote Terminal Unit Interface
Modicon Communication Bus (Modbus ™ ) enables the
chiller controller to communicate as a slave device on a
Modbus
™ network. Chiller setpoints, operating modes,
alarms and status can be monitored and controlled by
a Modbus
™ master device.
N No otte e:: For more information, see BAS-SVP01*-EN.
IIn nsstta alllla attiio on n E Elle eccttrriicca all